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) 2002-2023 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "ifuncs.h"
  25 #include "rounding.h"
  26 #include "inums.h"
  27 #include "io.h"
  28
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int am_generator;
  34 extern int inc_recurse;
  35 extern int always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38 extern int numeric_ids;
  39 extern int quiet;
  40 extern int recurse;
  41 extern int use_qsort;
  42 extern int xfer_dirs;
  43 extern int filesfrom_fd;
  44 extern int one_file_system;
  45 extern int copy_devices;
  46 extern int copy_dirlinks;
  47 extern int preserve_uid;
  48 extern int preserve_gid;
  49 extern int preserve_acls;
  50 extern int preserve_xattrs;
  51 extern int preserve_links;
  52 extern int preserve_hard_links;
  53 extern int preserve_devices;
  54 extern int preserve_specials;
  55 extern int delete_during;
  56 extern int missing_args;
  57 extern int eol_nulls;
  58 extern int atimes_ndx;
  59 extern int crtimes_ndx;
  60 extern int relative_paths;
  61 extern int implied_dirs;
  62 extern int ignore_perishable;
  63 extern int non_perishable_cnt;
  64 extern int prune_empty_dirs;
  65 extern int copy_links;
  66 extern int copy_unsafe_links;
  67 extern int protocol_version;
  68 extern int sanitize_paths;
  69 extern int munge_symlinks;
  70 extern int use_safe_inc_flist;
  71 extern int need_unsorted_flist;
  72 extern int sender_symlink_iconv;
  73 extern int output_needs_newline;
  74 extern int sender_keeps_checksum;
  75 extern int trust_sender_filter;
  76 extern int unsort_ndx;
  77 extern uid_t our_uid;
  78 extern struct stats stats;
  79 extern char *filesfrom_host;
  80 extern char *usermap, *groupmap;
  81
  82 extern struct name_num_item *file_sum_nni;
  83
  84 extern char curr_dir[MAXPATHLEN];
  85
  86 extern struct chmod_mode_struct *chmod_modes;
  87
  88 extern filter_rule_list filter_list, implied_filter_list, daemon_filter_list;
  89
  90 #ifdef ICONV_OPTION
  91 extern int filesfrom_convert;
  92 extern iconv_t ic_send, ic_recv;
  93 #endif
  94
  95 #define PTR_SIZE (sizeof (struct file_struct *))
  96
  97 int io_error;
  98 int flist_csum_len;
  99 dev_t filesystem_dev; /* used to implement -x */
 100
 101 struct file_list *cur_flist, *first_flist, *dir_flist;
 102 int send_dir_ndx = -1, send_dir_depth = -1;
 103 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
 104 int file_total = 0; /* total of all active items over all file-lists */
 105 int file_old_total = 0; /* total of active items that will soon be gone */
 106 int flist_eof = 0; /* all the file-lists are now known */
 107 int xfer_flags_as_varint = 0;
 108
 109 #define NORMAL_NAME 0
 110 #define SLASH_ENDING_NAME 1
 111 #define DOTDIR_NAME 2
 112 #define MISSING_NAME 3
 113
 114 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
 115  * internally, even if this platform does not allow files to have 64-bit inums.
 116  * The only exception is if we're on a platform with no 64-bit type at all.
 117  *
 118  * Because we use read_longint() to get these off the wire, if you transfer
 119  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
 120  * machine with no 64-bit types then you will get an overflow error.
 121  *
 122  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
 123  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
 124  * be truncated.  But it's a kind of silly thing to do anyhow. */
 125
 126 /* The tmp_* vars are used as a cache area by make_file() to store data
 127  * that the sender doesn't need to remember in its file list.  The data
 128  * will survive just long enough to be used by send_file_entry(). */
 129 static dev_t tmp_rdev;
 130 #ifdef SUPPORT_HARD_LINKS
 131 static int64 tmp_dev = -1, tmp_ino;
 132 #endif
 133 static char tmp_sum[MAX_DIGEST_LEN];
 134
 135 static char empty_sum[MAX_DIGEST_LEN];
 136 static int flist_count_offset; /* for --delete --progress */
 137 static int show_filelist_progress;
 138
 139 static struct file_list *flist_new(int flags, const char *msg);
 140 static void flist_sort_and_clean(struct file_list *flist, int strip_root);
 141 static void output_flist(struct file_list *flist);
 142
 143 void init_flist(void)
 144 {
 145         if (DEBUG_GTE(FLIST, 4)) {
 146                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 147                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 148         }
 149         /* Note that this isn't identical to file_sum_len in the case of CSUM_MD4_ARCHAIC: */
 150         flist_csum_len = csum_len_for_type(file_sum_nni->num, 1);
 151
 152         show_filelist_progress = INFO_GTE(FLIST, 1) && xfer_dirs && !am_server && !inc_recurse;
 153 }
 154
 155 static void start_filelist_progress(char *kind)
 156 {
 157         if (quiet)
 158                 return;
 159         rprintf(FCLIENT, "%s ... ", kind);
 160         output_needs_newline = 1;
 161         rflush(FINFO);
 162 }
 163
 164 static void emit_filelist_progress(int count)
 165 {
 166         if (quiet)
 167                 return;
 168         if (output_needs_newline == 2) /* avoid a newline in the middle of this filelist-progress output */
 169                 output_needs_newline = 0;
 170         rprintf(FCLIENT, " %d files...\r", count);
 171         output_needs_newline = 2;
 172 }
 173
 174 static void maybe_emit_filelist_progress(int count)
 175 {
 176         if (INFO_GTE(FLIST, 2) && show_filelist_progress && (count % 100) == 0)
 177                 emit_filelist_progress(count);
 178 }
 179
 180 static void finish_filelist_progress(const struct file_list *flist)
 181 {
 182         output_needs_newline = 0;
 183         if (INFO_GTE(FLIST, 2)) {
 184                 /* This overwrites the progress line */
 185                 rprintf(FINFO, "%d file%sto consider\n",
 186                         flist->used, flist->used == 1 ? " " : "s ");
 187         } else {
 188                 rprintf(FINFO, "done\n");
 189         }
 190 }
 191
 192 void show_flist_stats(void)
 193 {
 194         /* Nothing yet */
 195 }
 196
 197 /* Stat either a symlink or its referent, depending on the settings of
 198  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 199  *
 200  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 201  * MAXPATHLEN chars) will be set to the symlink's target string.
 202  *
 203  * The stat structure pointed to by stp will contain information about the
 204  * link or the referent as appropriate, if they exist. */
 205 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 206 {
 207 #ifdef SUPPORT_LINKS
 208         if (link_stat(path, stp, copy_dirlinks) < 0)
 209                 return -1;
 210         if (S_ISLNK(stp->st_mode)) {
 211                 int llen = do_readlink(path, linkbuf, MAXPATHLEN - 1);
 212                 if (llen < 0)
 213                         return -1;
 214                 linkbuf[llen] = '\0';
 215                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 216                         if (INFO_GTE(SYMSAFE, 1)) {
 217                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 218                                         path, linkbuf);
 219                         }
 220                         return x_stat(path, stp, NULL);
 221                 }
 222                 if (munge_symlinks && am_sender && llen > SYMLINK_PREFIX_LEN
 223                  && strncmp(linkbuf, SYMLINK_PREFIX, SYMLINK_PREFIX_LEN) == 0) {
 224                         memmove(linkbuf, linkbuf + SYMLINK_PREFIX_LEN,
 225                                 llen - SYMLINK_PREFIX_LEN + 1);
 226                 }
 227         }
 228         return 0;
 229 #else
 230         return x_stat(path, stp, NULL);
 231 #endif
 232 }
 233
 234 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 235 {
 236 #ifdef SUPPORT_LINKS
 237         if (copy_links)
 238                 return x_stat(path, stp, NULL);
 239         if (x_lstat(path, stp, NULL) < 0)
 240                 return -1;
 241         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 242                 STRUCT_STAT st;
 243                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 244                         *stp = st;
 245         }
 246         return 0;
 247 #else
 248         return x_stat(path, stp, NULL);
 249 #endif
 250 }
 251
 252 static inline int path_is_daemon_excluded(char *path, int ignore_filename)
 253 {
 254         if (daemon_filter_list.head) {
 255                 char *slash = path;
 256
 257                 while ((slash = strchr(slash+1, '/')) != NULL) {
 258                         int ret;
 259                         *slash = '\0';
 260                         ret = check_filter(&daemon_filter_list, FLOG, path, 1);
 261                         *slash = '/';
 262                         if (ret < 0) {
 263                                 errno = ENOENT;
 264                                 return 1;
 265                         }
 266                 }
 267
 268                 if (!ignore_filename
 269                  && check_filter(&daemon_filter_list, FLOG, path, 1) < 0) {
 270                         errno = ENOENT;
 271                         return 1;
 272                 }
 273         }
 274
 275         return 0;
 276 }
 277
 278 static inline int is_excluded(const char *fname, int is_dir, int filter_level)
 279 {
 280         return name_is_excluded(fname, is_dir ? NAME_IS_DIR : NAME_IS_FILE, filter_level);
 281 }
 282
 283 static void send_directory(int f, struct file_list *flist,
 284                            char *fbuf, int len, int flags);
 285
 286 static const char *pathname, *orig_dir;
 287 static int pathname_len;
 288
 289 /* Make sure flist can hold at least flist->used + extra entries. */
 290 static void flist_expand(struct file_list *flist, int extra)
 291 {
 292         struct file_struct **new_ptr;
 293
 294         if (flist->used + extra <= flist->malloced)
 295                 return;
 296
 297         if (flist->malloced < FLIST_START)
 298                 flist->malloced = FLIST_START;
 299         else if (flist->malloced >= FLIST_LINEAR)
 300                 flist->malloced += FLIST_LINEAR;
 301         else if (flist->malloced < FLIST_START_LARGE/16)
 302                 flist->malloced *= 4;
 303         else
 304                 flist->malloced *= 2;
 305
 306         /* In case count jumped or we are starting the list
 307          * with a known size just set it. */
 308         if (flist->malloced < flist->used + extra)
 309                 flist->malloced = flist->used + extra;
 310
 311         new_ptr = realloc_array(flist->files, struct file_struct *, flist->malloced);
 312
 313         if (DEBUG_GTE(FLIST, 1) && flist->files) {
 314                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %s bytes, did%s move\n",
 315                     who_am_i(),
 316                     big_num(sizeof flist->files[0] * flist->malloced),
 317                     (new_ptr == flist->files) ? " not" : "");
 318         }
 319
 320         flist->files = new_ptr;
 321 }
 322
 323 static void flist_done_allocating(struct file_list *flist)
 324 {
 325         void *ptr = pool_boundary(flist->file_pool, 8*1024);
 326         if (flist->pool_boundary == ptr)
 327                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
 328         else
 329                 flist->pool_boundary = ptr;
 330 }
 331
 332 /* Call this with EITHER (1) "file, NULL, 0" to chdir() to the file's
 333  * F_PATHNAME(), or (2) "NULL, dir, dirlen" to chdir() to the supplied dir,
 334  * with dir == NULL taken to be the starting directory, and dirlen < 0
 335  * indicating that strdup(dir) should be called and then the -dirlen length
 336  * value checked to ensure that it is not daemon-excluded. */
 337 int change_pathname(struct file_struct *file, const char *dir, int dirlen)
 338 {
 339         if (dirlen < 0) {
 340                 char *cpy = strdup(dir);
 341                 if (*cpy != '/')
 342                         change_dir(orig_dir, CD_SKIP_CHDIR);
 343                 if (path_is_daemon_excluded(cpy, 0))
 344                         goto chdir_error;
 345                 dir = cpy;
 346                 dirlen = -dirlen;
 347         } else {
 348                 if (file) {
 349                         if (pathname == F_PATHNAME(file))
 350                                 return 1;
 351                         dir = F_PATHNAME(file);
 352                         if (dir)
 353                                 dirlen = strlen(dir);
 354                 } else if (pathname == dir)
 355                         return 1;
 356                 if (dir && *dir != '/')
 357                         change_dir(orig_dir, CD_SKIP_CHDIR);
 358         }
 359
 360         pathname = dir;
 361         pathname_len = dirlen;
 362
 363         if (!dir)
 364                 dir = orig_dir;
 365
 366         if (!change_dir(dir, CD_NORMAL)) {
 367           chdir_error:
 368                 io_error |= IOERR_GENERAL;
 369                 rsyserr(FERROR_XFER, errno, "change_dir %s failed", full_fname(dir));
 370                 if (dir != orig_dir)
 371                         change_dir(orig_dir, CD_NORMAL);
 372                 pathname = NULL;
 373                 pathname_len = 0;
 374                 return 0;
 375         }
 376
 377         return 1;
 378 }
 379
 380 static void send_file_entry(int f, const char *fname, struct file_struct *file,
 381 #ifdef SUPPORT_LINKS
 382                             const char *symlink_name, int symlink_len,
 383 #endif
 384                             int ndx, int first_ndx)
 385 {
 386         static time_t modtime, atime;
 387 #ifdef SUPPORT_CRTIMES
 388         static time_t crtime;
 389 #endif
 390         static mode_t mode;
 391 #ifdef SUPPORT_HARD_LINKS
 392         static int64 dev;
 393 #endif
 394         static dev_t rdev;
 395         static uint32 rdev_major;
 396         static uid_t uid;
 397         static gid_t gid;
 398         static const char *user_name, *group_name;
 399         static char lastname[MAXPATHLEN];
 400 #ifdef SUPPORT_HARD_LINKS
 401         int first_hlink_ndx = -1;
 402 #endif
 403         int l1, l2;
 404         int xflags;
 405
 406         /* Initialize starting value of xflags and adjust counts. */
 407         if (S_ISREG(file->mode))
 408                 xflags = 0;
 409         else if (S_ISDIR(file->mode)) {
 410                 stats.num_dirs++;
 411                 if (protocol_version >= 30) {
 412                         if (file->flags & FLAG_CONTENT_DIR)
 413                                 xflags = file->flags & FLAG_TOP_DIR;
 414                         else if (file->flags & FLAG_IMPLIED_DIR)
 415                                 xflags = XMIT_TOP_DIR | XMIT_NO_CONTENT_DIR;
 416                         else
 417                                 xflags = XMIT_NO_CONTENT_DIR;
 418                 } else
 419                         xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 420         } else {
 421                 if (S_ISLNK(file->mode))
 422                         stats.num_symlinks++;
 423                 else if (IS_DEVICE(file->mode))
 424                         stats.num_devices++;
 425                 else if (IS_SPECIAL(file->mode))
 426                         stats.num_specials++;
 427                 xflags = 0;
 428         }
 429
 430         if (file->mode == mode)
 431                 xflags |= XMIT_SAME_MODE;
 432         else
 433                 mode = file->mode;
 434
 435         if (preserve_devices && IS_DEVICE(mode)) {
 436                 if (protocol_version < 28) {
 437                         if (tmp_rdev == rdev)
 438                                 xflags |= XMIT_SAME_RDEV_pre28;
 439                         else
 440                                 rdev = tmp_rdev;
 441                 } else {
 442                         rdev = tmp_rdev;
 443                         if ((uint32)major(rdev) == rdev_major)
 444                                 xflags |= XMIT_SAME_RDEV_MAJOR;
 445                         else
 446                                 rdev_major = major(rdev);
 447                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 448                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 449                 }
 450         } else if (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31) {
 451                 /* Special files don't need an rdev number, so just make
 452                  * the historical transmission of the value efficient. */
 453                 if (protocol_version < 28)
 454                         xflags |= XMIT_SAME_RDEV_pre28;
 455                 else {
 456                         rdev = MAKEDEV(rdev_major, 0);
 457                         xflags |= XMIT_SAME_RDEV_MAJOR;
 458                         if (protocol_version < 30)
 459                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 460                 }
 461         } else if (protocol_version < 28)
 462                 rdev = MAKEDEV(0, 0);
 463         if (!preserve_uid || ((uid_t)F_OWNER(file) == uid && *lastname))
 464                 xflags |= XMIT_SAME_UID;
 465         else {
 466                 uid = F_OWNER(file);
 467                 if (!numeric_ids) {
 468                         user_name = add_uid(uid);
 469                         if (inc_recurse && user_name)
 470                                 xflags |= XMIT_USER_NAME_FOLLOWS;
 471                 }
 472         }
 473         if (!preserve_gid || ((gid_t)F_GROUP(file) == gid && *lastname))
 474                 xflags |= XMIT_SAME_GID;
 475         else {
 476                 gid = F_GROUP(file);
 477                 if (!numeric_ids) {
 478                         group_name = add_gid(gid);
 479                         if (inc_recurse && group_name)
 480                                 xflags |= XMIT_GROUP_NAME_FOLLOWS;
 481                 }
 482         }
 483         if (file->modtime == modtime)
 484                 xflags |= XMIT_SAME_TIME;
 485         else
 486                 modtime = file->modtime;
 487         if (NSEC_BUMP(file) && protocol_version >= 31)
 488                 xflags |= XMIT_MOD_NSEC;
 489         if (atimes_ndx && !S_ISDIR(mode)) {
 490                 if (F_ATIME(file) == atime)
 491                         xflags |= XMIT_SAME_ATIME;
 492                 else
 493                         atime = F_ATIME(file);
 494         }
 495 #ifdef SUPPORT_CRTIMES
 496         if (crtimes_ndx) {
 497                 crtime = F_CRTIME(file);
 498                 if (crtime == modtime)
 499                         xflags |= XMIT_CRTIME_EQ_MTIME;
 500         }
 501 #endif
 502
 503 #ifdef SUPPORT_HARD_LINKS
 504         if (tmp_dev != -1) {
 505                 if (protocol_version >= 30) {
 506                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
 507                         first_hlink_ndx = (int32)(long)np->data; /* is -1 when new */
 508                         if (first_hlink_ndx < 0) {
 509                                 np->data = (void*)(long)(first_ndx + ndx);
 510                                 xflags |= XMIT_HLINK_FIRST;
 511                         }
 512                         if (DEBUG_GTE(HLINK, 1)) {
 513                                 if (first_hlink_ndx >= 0) {
 514                                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 515                                                 who_am_i(), first_ndx + ndx, first_hlink_ndx,
 516                                                 first_hlink_ndx >= first_ndx ? "" : "un");
 517                                 } else if (DEBUG_GTE(HLINK, 3)) {
 518                                         rprintf(FINFO, "[%s] dev:inode for #%d is %s:%s\n",
 519                                                 who_am_i(), first_ndx + ndx,
 520                                                 big_num(tmp_dev), big_num(tmp_ino));
 521                                 }
 522                         }
 523                 } else {
 524                         if (tmp_dev == dev) {
 525                                 if (protocol_version >= 28)
 526                                         xflags |= XMIT_SAME_DEV_pre30;
 527                         } else
 528                                 dev = tmp_dev;
 529                 }
 530                 xflags |= XMIT_HLINKED;
 531         }
 532 #endif
 533
 534         for (l1 = 0;
 535             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 536             l1++) {}
 537         l2 = strlen(fname+l1);
 538
 539         if (l1 > 0)
 540                 xflags |= XMIT_SAME_NAME;
 541         if (l2 > 255)
 542                 xflags |= XMIT_LONG_NAME;
 543
 544         /* We must avoid sending a flag value of 0 (or an initial byte of
 545          * 0 for the older xflags protocol) or it will signal the end of
 546          * the list.  Note that the use of XMIT_TOP_DIR on a non-dir has
 547          * no meaning, so it's a harmless way to add a bit to the first
 548          * flag byte. */
 549         if (xfer_flags_as_varint)
 550                 write_varint(f, xflags ? xflags : XMIT_EXTENDED_FLAGS);
 551         else if (protocol_version >= 28) {
 552                 if (!xflags && !S_ISDIR(mode))
 553                         xflags |= XMIT_TOP_DIR;
 554                 if ((xflags & 0xFF00) || !xflags) {
 555                         xflags |= XMIT_EXTENDED_FLAGS;
 556                         write_shortint(f, xflags);
 557                 } else
 558                         write_byte(f, xflags);
 559         } else {
 560                 if (!(xflags & 0xFF))
 561                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 562                 write_byte(f, xflags);
 563         }
 564         if (xflags & XMIT_SAME_NAME)
 565                 write_byte(f, l1);
 566         if (xflags & XMIT_LONG_NAME)
 567                 write_varint30(f, l2);
 568         else
 569                 write_byte(f, l2);
 570         write_buf(f, fname + l1, l2);
 571
 572 #ifdef SUPPORT_HARD_LINKS
 573         if (first_hlink_ndx >= 0) {
 574                 write_varint(f, first_hlink_ndx);
 575                 if (first_hlink_ndx >= first_ndx)
 576                         goto the_end;
 577         }
 578 #endif
 579
 580         write_varlong30(f, F_LENGTH(file), 3);
 581         if (!(xflags & XMIT_SAME_TIME)) {
 582                 if (protocol_version >= 30)
 583                         write_varlong(f, modtime, 4);
 584                 else
 585                         write_int(f, modtime);
 586         }
 587         if (xflags & XMIT_MOD_NSEC)
 588                 write_varint(f, F_MOD_NSEC(file));
 589 #ifdef SUPPORT_CRTIMES
 590         if (crtimes_ndx && !(xflags & XMIT_CRTIME_EQ_MTIME))
 591                 write_varlong(f, crtime, 4);
 592 #endif
 593         if (!(xflags & XMIT_SAME_MODE))
 594                 write_int(f, to_wire_mode(mode));
 595         if (atimes_ndx && !S_ISDIR(mode) && !(xflags & XMIT_SAME_ATIME))
 596                 write_varlong(f, atime, 4);
 597         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 598                 if (protocol_version < 30)
 599                         write_int(f, uid);
 600                 else {
 601                         write_varint(f, uid);
 602                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
 603                                 int len = strlen(user_name);
 604                                 write_byte(f, len);
 605                                 write_buf(f, user_name, len);
 606                         }
 607                 }
 608         }
 609         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 610                 if (protocol_version < 30)
 611                         write_int(f, gid);
 612                 else {
 613                         write_varint(f, gid);
 614                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
 615                                 int len = strlen(group_name);
 616                                 write_byte(f, len);
 617                                 write_buf(f, group_name, len);
 618                         }
 619                 }
 620         }
 621         if ((preserve_devices && IS_DEVICE(mode))
 622          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 623                 if (protocol_version < 28) {
 624                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 625                                 write_int(f, (int)rdev);
 626                 } else {
 627                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 628                                 write_varint30(f, major(rdev));
 629                         if (protocol_version >= 30)
 630                                 write_varint(f, minor(rdev));
 631                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 632                                 write_byte(f, minor(rdev));
 633                         else
 634                                 write_int(f, minor(rdev));
 635                 }
 636         }
 637
 638 #ifdef SUPPORT_LINKS
 639         if (symlink_len) {
 640                 write_varint30(f, symlink_len);
 641                 write_buf(f, symlink_name, symlink_len);
 642         }
 643 #endif
 644
 645 #ifdef SUPPORT_HARD_LINKS
 646         if (tmp_dev != -1 && protocol_version < 30) {
 647                 /* Older protocols expect the dev number to be transmitted
 648                  * 1-incremented so that it is never zero. */
 649                 if (protocol_version < 26) {
 650                         /* 32-bit dev_t and ino_t */
 651                         write_int(f, (int32)(dev+1));
 652                         write_int(f, (int32)tmp_ino);
 653                 } else {
 654                         /* 64-bit dev_t and ino_t */
 655                         if (!(xflags & XMIT_SAME_DEV_pre30))
 656                                 write_longint(f, dev+1);
 657                         write_longint(f, tmp_ino);
 658                 }
 659         }
 660 #endif
 661
 662         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 663                 const char *sum;
 664                 if (S_ISREG(mode))
 665                         sum = tmp_sum;
 666                 else {
 667                         /* Prior to 28, we sent a useless set of nulls. */
 668                         sum = empty_sum;
 669                 }
 670                 write_buf(f, sum, flist_csum_len);
 671         }
 672
 673 #ifdef SUPPORT_HARD_LINKS
 674   the_end:
 675 #endif
 676         strlcpy(lastname, fname, MAXPATHLEN);
 677
 678         if (S_ISREG(mode) || S_ISLNK(mode))
 679                 stats.total_size += F_LENGTH(file);
 680 }
 681
 682 static struct file_struct *recv_file_entry(int f, struct file_list *flist, int xflags)
 683 {
 684         static int64 modtime, atime;
 685 #ifdef SUPPORT_CRTIMES
 686         static time_t crtime;
 687 #endif
 688         static mode_t mode;
 689 #ifdef SUPPORT_HARD_LINKS
 690         static int64 dev;
 691 #endif
 692         static dev_t rdev;
 693         static uint32 rdev_major;
 694         static uid_t uid;
 695         static gid_t gid;
 696         static uint16 gid_flags;
 697         static char lastname[MAXPATHLEN], *lastdir;
 698         static int lastdir_depth, lastdir_len = -1;
 699         static unsigned int del_hier_name_len = 0;
 700         static int in_del_hier = 0;
 701         char thisname[MAXPATHLEN];
 702         unsigned int l1 = 0, l2 = 0;
 703         int alloc_len, basename_len, linkname_len;
 704         int extra_len = file_extra_cnt * EXTRA_LEN;
 705         int first_hlink_ndx = -1;
 706         char real_ISREG_entry;
 707         int64 file_length;
 708 #ifdef CAN_SET_NSEC
 709         uint32 modtime_nsec;
 710 #endif
 711         const char *basename;
 712         struct file_struct *file;
 713         alloc_pool_t *pool;
 714         char *bp;
 715
 716         if (xflags & XMIT_SAME_NAME)
 717                 l1 = read_byte(f);
 718
 719         if (xflags & XMIT_LONG_NAME)
 720                 l2 = read_varint30(f);
 721         else
 722                 l2 = read_byte(f);
 723
 724         if (l2 >= MAXPATHLEN - l1) {
 725                 rprintf(FERROR,
 726                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 727                         xflags, l1, l2, lastname, who_am_i());
 728                 overflow_exit("recv_file_entry");
 729         }
 730
 731         strlcpy(thisname, lastname, l1 + 1);
 732         read_sbuf(f, &thisname[l1], l2);
 733         thisname[l1 + l2] = 0;
 734
 735         /* Abuse basename_len for a moment... */
 736         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
 737
 738 #ifdef ICONV_OPTION
 739         if (ic_recv != (iconv_t)-1) {
 740                 xbuf outbuf, inbuf;
 741
 742                 INIT_CONST_XBUF(outbuf, thisname);
 743                 INIT_XBUF(inbuf, lastname, basename_len, (size_t)-1);
 744
 745                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
 746                         io_error |= IOERR_GENERAL;
 747                         rprintf(FERROR_UTF8,
 748                             "[%s] cannot convert filename: %s (%s)\n",
 749                             who_am_i(), lastname, strerror(errno));
 750                         outbuf.len = 0;
 751                 }
 752                 thisname[outbuf.len] = '\0';
 753         }
 754 #endif
 755
 756         if (*thisname
 757          && (clean_fname(thisname, CFN_REFUSE_DOT_DOT_DIRS) < 0 || (!relative_paths && *thisname == '/'))) {
 758                 rprintf(FERROR, "ABORTING due to unsafe pathname from sender: %s\n", thisname);
 759                 exit_cleanup(RERR_UNSUPPORTED);
 760         }
 761
 762         if (sanitize_paths)
 763                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
 764
 765         if ((basename = strrchr(thisname, '/')) != NULL) {
 766                 int len = basename++ - thisname;
 767                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 768                         lastdir = new_array(char, len + 1);
 769                         memcpy(lastdir, thisname, len);
 770                         lastdir[len] = '\0';
 771                         lastdir_len = len;
 772                         lastdir_depth = count_dir_elements(lastdir);
 773                 }
 774         } else
 775                 basename = thisname;
 776         basename_len = strlen(basename) + 1; /* count the '\0' */
 777
 778 #ifdef SUPPORT_HARD_LINKS
 779         if (protocol_version >= 30
 780          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 781                 first_hlink_ndx = read_varint(f);
 782                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
 783                         rprintf(FERROR,
 784                                 "hard-link reference out of range: %d (%d)\n",
 785                                 first_hlink_ndx, flist->ndx_start + flist->used);
 786                         exit_cleanup(RERR_PROTOCOL);
 787                 }
 788                 if (DEBUG_GTE(HLINK, 1)) {
 789                         rprintf(FINFO, "[%s] #%d hard-links #%d (%sabbrev)\n",
 790                                 who_am_i(), flist->used+flist->ndx_start, first_hlink_ndx,
 791                                 first_hlink_ndx >= flist->ndx_start ? "" : "un");
 792                 }
 793                 if (first_hlink_ndx >= flist->ndx_start) {
 794                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 795                         file_length = F_LENGTH(first);
 796                         modtime = first->modtime;
 797 #ifdef CAN_SET_NSEC
 798                         modtime_nsec = F_MOD_NSEC_or_0(first);
 799 #endif
 800                         mode = first->mode;
 801                         if (atimes_ndx && !S_ISDIR(mode))
 802                                 atime = F_ATIME(first);
 803 #ifdef SUPPORT_CRTIMES
 804                         if (crtimes_ndx)
 805                                 crtime = F_CRTIME(first);
 806 #endif
 807                         if (preserve_uid)
 808                                 uid = F_OWNER(first);
 809                         if (preserve_gid)
 810                                 gid = F_GROUP(first);
 811                         if (preserve_devices && IS_DEVICE(mode)) {
 812                                 uint32 *devp = F_RDEV_P(first);
 813                                 rdev_major = DEV_MAJOR(devp);
 814                                 rdev = MAKEDEV(rdev_major, DEV_MINOR(devp));
 815                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 816                         }
 817                         if (preserve_links && S_ISLNK(mode))
 818                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
 819                         else
 820                                 linkname_len = 0;
 821                         real_ISREG_entry = S_ISREG(mode) ? 1 : 0;
 822                         goto create_object;
 823                 }
 824         }
 825 #endif
 826
 827         file_length = read_varlong30(f, 3);
 828         if (!(xflags & XMIT_SAME_TIME)) {
 829                 if (protocol_version >= 30) {
 830                         modtime = read_varlong(f, 4);
 831 #if SIZEOF_TIME_T < SIZEOF_INT64
 832                         if (!am_generator && (int64)(time_t)modtime != modtime) {
 833                                 rprintf(FERROR_XFER,
 834                                     "Time value of %s truncated on receiver.\n",
 835                                     lastname);
 836                         }
 837 #endif
 838                 } else
 839                         modtime = read_uint(f);
 840         }
 841         if (xflags & XMIT_MOD_NSEC)
 842 #ifndef CAN_SET_NSEC
 843                 (void)read_varint(f);
 844 #else
 845                 modtime_nsec = read_varint(f);
 846         else
 847                 modtime_nsec = 0;
 848 #endif
 849 #ifdef SUPPORT_CRTIMES
 850         if (crtimes_ndx) {
 851                 if (xflags & XMIT_CRTIME_EQ_MTIME)
 852                         crtime = modtime;
 853                 else
 854                         crtime = read_varlong(f, 4);
 855 #if SIZEOF_TIME_T < SIZEOF_INT64
 856                 if (!am_generator && (int64)(time_t)crtime != crtime) {
 857                         rprintf(FERROR_XFER,
 858                                 "Create time value of %s truncated on receiver.\n",
 859                                 lastname);
 860                 }
 861 #endif
 862         }
 863 #endif
 864         if (!(xflags & XMIT_SAME_MODE))
 865                 mode = from_wire_mode(read_int(f));
 866         if (atimes_ndx && !S_ISDIR(mode) && !(xflags & XMIT_SAME_ATIME)) {
 867                 atime = read_varlong(f, 4);
 868 #if SIZEOF_TIME_T < SIZEOF_INT64
 869                 if (!am_generator && (int64)(time_t)atime != atime) {
 870                         rprintf(FERROR_XFER,
 871                                 "Access time value of %s truncated on receiver.\n",
 872                                 lastname);
 873                 }
 874 #endif
 875         }
 876
 877         if (chmod_modes && !S_ISLNK(mode) && mode)
 878                 mode = tweak_mode(mode, chmod_modes);
 879
 880         if (preserve_uid && !(xflags & XMIT_SAME_UID)) {
 881                 if (protocol_version < 30)
 882                         uid = (uid_t)read_int(f);
 883                 else {
 884                         uid = (uid_t)read_varint(f);
 885                         if (xflags & XMIT_USER_NAME_FOLLOWS)
 886                                 uid = recv_user_name(f, uid);
 887                         else if (inc_recurse && am_root && (!numeric_ids || usermap))
 888                                 uid = match_uid(uid);
 889                 }
 890         }
 891         if (preserve_gid && !(xflags & XMIT_SAME_GID)) {
 892                 if (protocol_version < 30)
 893                         gid = (gid_t)read_int(f);
 894                 else {
 895                         gid = (gid_t)read_varint(f);
 896                         gid_flags = 0;
 897                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
 898                                 gid = recv_group_name(f, gid, &gid_flags);
 899                         else if (inc_recurse && (!am_root || !numeric_ids || groupmap))
 900                                 gid = match_gid(gid, &gid_flags);
 901                 }
 902         }
 903
 904         if ((preserve_devices && IS_DEVICE(mode))
 905          || (preserve_specials && IS_SPECIAL(mode) && protocol_version < 31)) {
 906                 if (protocol_version < 28) {
 907                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 908                                 rdev = (dev_t)read_int(f);
 909                 } else {
 910                         uint32 rdev_minor;
 911                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 912                                 rdev_major = read_varint30(f);
 913                         if (protocol_version >= 30)
 914                                 rdev_minor = read_varint(f);
 915                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 916                                 rdev_minor = read_byte(f);
 917                         else
 918                                 rdev_minor = read_int(f);
 919                         rdev = MAKEDEV(rdev_major, rdev_minor);
 920                 }
 921                 if (IS_DEVICE(mode))
 922                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 923                 file_length = 0;
 924         } else if (protocol_version < 28)
 925                 rdev = MAKEDEV(0, 0);
 926
 927 #ifdef SUPPORT_LINKS
 928         if (preserve_links && S_ISLNK(mode)) {
 929                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 930                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 931                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 932                                 linkname_len - 1);
 933                         overflow_exit("recv_file_entry");
 934                 }
 935 #ifdef ICONV_OPTION
 936                 /* We don't know how much extra room we need to convert
 937                  * the as-yet-unread symlink data, so let's hope that a
 938                  * double-size buffer is plenty. */
 939                 if (sender_symlink_iconv)
 940                         linkname_len *= 2;
 941 #endif
 942                 if (munge_symlinks)
 943                         linkname_len += SYMLINK_PREFIX_LEN;
 944         }
 945         else
 946 #endif
 947                 linkname_len = 0;
 948
 949         if (copy_devices && IS_DEVICE(mode)) {
 950                 /* This is impossible in the official release, but some pre-release patches
 951                  * didn't convert the device into a file before sending, so we'll do it here
 952                  * (even though the length is typically 0 and any checksum data is zeros). */
 953                 mode = S_IFREG | (mode & ACCESSPERMS);
 954                 modtime = time(NULL); /* The mtime on the device is not up-to-date, so set it to "now". */
 955                 real_ISREG_entry = 0;
 956         } else
 957                 real_ISREG_entry = S_ISREG(mode) ? 1 : 0;
 958
 959 #ifdef SUPPORT_HARD_LINKS
 960   create_object:
 961         if (preserve_hard_links) {
 962                 if (protocol_version < 28 && real_ISREG_entry)
 963                         xflags |= XMIT_HLINKED;
 964                 if (xflags & XMIT_HLINKED)
 965                         extra_len += (inc_recurse+1) * EXTRA_LEN;
 966         }
 967 #endif
 968
 969 #ifdef SUPPORT_ACLS
 970         /* Directories need an extra int32 for the default ACL. */
 971         if (preserve_acls && S_ISDIR(mode))
 972                 extra_len += EXTRA_LEN;
 973 #endif
 974
 975         if (always_checksum && S_ISREG(mode))
 976                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 977
 978 #if SIZEOF_INT64 >= 8
 979         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 980                 extra_len += EXTRA_LEN;
 981 #endif
 982 #ifdef CAN_SET_NSEC
 983         if (modtime_nsec)
 984                 extra_len += EXTRA_LEN;
 985 #endif
 986         if (file_length < 0) {
 987                 rprintf(FERROR, "Offset underflow: file-length is negative\n");
 988                 exit_cleanup(RERR_UNSUPPORTED);
 989         }
 990
 991         if (*thisname == '/' ? thisname[1] != '.' || thisname[2] != '\0' : *thisname != '.' || thisname[1] != '\0') {
 992                 int filt_flags = S_ISDIR(mode) ? NAME_IS_DIR : NAME_IS_FILE;
 993                 if (!trust_sender_filter /* a per-dir filter rule means we must trust the sender's filtering */
 994                  && filter_list.head && check_server_filter(&filter_list, FINFO, thisname, filt_flags) < 0) {
 995                         rprintf(FERROR, "ERROR: rejecting excluded file-list name: %s\n", thisname);
 996                         exit_cleanup(RERR_UNSUPPORTED);
 997                 }
 998                 if (implied_filter_list.head && check_filter(&implied_filter_list, FINFO, thisname, filt_flags) <= 0) {
 999                         rprintf(FERROR, "ERROR: rejecting unrequested file-list name: %s\n", thisname);
1000                         exit_cleanup(RERR_UNSUPPORTED);
1001                 }
1002         }
1003
1004         if (inc_recurse && S_ISDIR(mode)) {
1005                 if (one_file_system) {
1006                         /* Room to save the dir's device for -x */
1007                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
1008                 }
1009                 pool = dir_flist->file_pool;
1010         } else
1011                 pool = flist->file_pool;
1012
1013 #if EXTRA_ROUNDING > 0
1014         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1015                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1016 #endif
1017
1018         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1019                   + linkname_len;
1020         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
1021
1022         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1023         bp += extra_len;
1024         file = (struct file_struct *)bp;
1025         bp += FILE_STRUCT_LEN;
1026
1027         memcpy(bp, basename, basename_len);
1028
1029 #ifdef SUPPORT_HARD_LINKS
1030         if (xflags & XMIT_HLINKED
1031 #ifndef CAN_HARDLINK_SYMLINK
1032          && !S_ISLNK(mode)
1033 #endif
1034 #ifndef CAN_HARDLINK_SPECIAL
1035          && !IS_SPECIAL(mode) && !IS_DEVICE(mode)
1036 #endif
1037         )
1038                 file->flags |= FLAG_HLINKED;
1039 #endif
1040         file->modtime = (time_t)modtime;
1041 #ifdef CAN_SET_NSEC
1042         if (modtime_nsec) {
1043                 file->flags |= FLAG_MOD_NSEC;
1044                 F_MOD_NSEC(file) = modtime_nsec;
1045         }
1046 #endif
1047         file->len32 = (uint32)file_length;
1048 #if SIZEOF_INT64 >= 8
1049         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
1050 #if SIZEOF_CAPITAL_OFF_T < 8
1051                 rprintf(FERROR, "Offset overflow: attempted 64-bit file-length\n");
1052                 exit_cleanup(RERR_UNSUPPORTED);
1053 #else
1054                 file->flags |= FLAG_LENGTH64;
1055                 F_HIGH_LEN(file) = (uint32)(file_length >> 32);
1056 #endif
1057         }
1058 #endif
1059         file->mode = mode;
1060         if (preserve_uid)
1061                 F_OWNER(file) = uid;
1062         if (preserve_gid) {
1063                 F_GROUP(file) = gid;
1064                 file->flags |= gid_flags;
1065         }
1066         if (atimes_ndx && !S_ISDIR(mode))
1067                 F_ATIME(file) = atime;
1068 #ifdef SUPPORT_CRTIMES
1069         if (crtimes_ndx)
1070                 F_CRTIME(file) = crtime;
1071 #endif
1072         if (unsort_ndx)
1073                 F_NDX(file) = flist->used + flist->ndx_start;
1074
1075         if (basename != thisname) {
1076                 file->dirname = lastdir;
1077                 F_DEPTH(file) = lastdir_depth + 1;
1078         } else
1079                 F_DEPTH(file) = 1;
1080
1081         if (S_ISDIR(mode)) {
1082                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
1083                         F_DEPTH(file)--;
1084                 if (protocol_version >= 30) {
1085                         if (!(xflags & XMIT_NO_CONTENT_DIR)) {
1086                                 if (xflags & XMIT_TOP_DIR)
1087                                         file->flags |= FLAG_TOP_DIR;
1088                                 file->flags |= FLAG_CONTENT_DIR;
1089                         } else if (xflags & XMIT_TOP_DIR)
1090                                 file->flags |= FLAG_IMPLIED_DIR;
1091                 } else if (xflags & XMIT_TOP_DIR) {
1092                         in_del_hier = recurse;
1093                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
1094                         if (relative_paths && del_hier_name_len > 2
1095                             && lastname[del_hier_name_len-1] == '.'
1096                             && lastname[del_hier_name_len-2] == '/')
1097                                 del_hier_name_len -= 2;
1098                         file->flags |= FLAG_TOP_DIR | FLAG_CONTENT_DIR;
1099                 } else if (in_del_hier) {
1100                         if (!relative_paths || !del_hier_name_len
1101                          || (l1 >= del_hier_name_len
1102                           && lastname[del_hier_name_len] == '/'))
1103                                 file->flags |= FLAG_CONTENT_DIR;
1104                         else
1105                                 in_del_hier = 0;
1106                 }
1107         }
1108
1109         if (preserve_devices && IS_DEVICE(mode)) {
1110                 uint32 *devp = F_RDEV_P(file);
1111                 DEV_MAJOR(devp) = major(rdev);
1112                 DEV_MINOR(devp) = minor(rdev);
1113         }
1114
1115 #ifdef SUPPORT_LINKS
1116         if (linkname_len) {
1117                 bp += basename_len;
1118                 if (first_hlink_ndx >= flist->ndx_start) {
1119                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1120                         memcpy(bp, F_SYMLINK(first), linkname_len);
1121                 } else {
1122                         if (munge_symlinks) {
1123                                 strlcpy(bp, SYMLINK_PREFIX, linkname_len);
1124                                 bp += SYMLINK_PREFIX_LEN;
1125                                 linkname_len -= SYMLINK_PREFIX_LEN;
1126                         }
1127 #ifdef ICONV_OPTION
1128                         if (sender_symlink_iconv) {
1129                                 xbuf outbuf, inbuf;
1130
1131                                 alloc_len = linkname_len;
1132                                 linkname_len /= 2;
1133
1134                                 /* Read the symlink data into the end of our double-sized
1135                                  * buffer and then convert it into the right spot. */
1136                                 INIT_XBUF(inbuf, bp + alloc_len - linkname_len,
1137                                           linkname_len - 1, (size_t)-1);
1138                                 read_sbuf(f, inbuf.buf, inbuf.len);
1139                                 INIT_XBUF(outbuf, bp, 0, alloc_len);
1140
1141                                 if (iconvbufs(ic_recv, &inbuf, &outbuf, ICB_INIT) < 0) {
1142                                         io_error |= IOERR_GENERAL;
1143                                         rprintf(FERROR_XFER,
1144                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1145                                             who_am_i(), full_fname(thisname), strerror(errno));
1146                                         bp = (char*)file->basename;
1147                                         *bp++ = '\0';
1148                                         outbuf.len = 0;
1149                                 }
1150                                 bp[outbuf.len] = '\0';
1151                         } else
1152 #endif
1153                                 read_sbuf(f, bp, linkname_len - 1);
1154                         if (sanitize_paths && !munge_symlinks && *bp)
1155                                 sanitize_path(bp, bp, "", lastdir_depth, SP_DEFAULT);
1156                 }
1157         }
1158 #endif
1159
1160 #ifdef SUPPORT_HARD_LINKS
1161         if (preserve_hard_links && xflags & XMIT_HLINKED) {
1162                 if (protocol_version >= 30) {
1163                         if (xflags & XMIT_HLINK_FIRST) {
1164                                 F_HL_GNUM(file) = flist->ndx_start + flist->used;
1165                         } else
1166                                 F_HL_GNUM(file) = first_hlink_ndx;
1167                 } else {
1168                         static int32 cnt = 0;
1169                         struct ht_int64_node *np;
1170                         int64 ino;
1171                         int32 ndx;
1172                         if (protocol_version < 26) {
1173                                 dev = read_int(f);
1174                                 ino = read_int(f);
1175                         } else {
1176                                 if (!(xflags & XMIT_SAME_DEV_pre30))
1177                                         dev = read_longint(f);
1178                                 ino = read_longint(f);
1179                         }
1180                         np = idev_find(dev, ino);
1181                         ndx = (int32)(long)np->data; /* is -1 when new */
1182                         if (ndx < 0) {
1183                                 np->data = (void*)(long)cnt;
1184                                 ndx = cnt++;
1185                         }
1186                         F_HL_GNUM(file) = ndx;
1187                 }
1188         }
1189 #endif
1190
1191         if (always_checksum && (real_ISREG_entry || protocol_version < 28)) {
1192                 if (real_ISREG_entry)
1193                         bp = F_SUM(file);
1194                 else {
1195                         /* Prior to 28, we get a useless set of nulls. */
1196                         bp = tmp_sum;
1197                 }
1198                 if (first_hlink_ndx >= flist->ndx_start) {
1199                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
1200                         memcpy(bp, F_SUM(first), flist_csum_len);
1201                 } else
1202                         read_buf(f, bp, flist_csum_len);
1203         }
1204
1205 #ifdef SUPPORT_ACLS
1206         if (preserve_acls && !S_ISLNK(mode))
1207                 receive_acl(f, file);
1208 #endif
1209 #ifdef SUPPORT_XATTRS
1210         if (preserve_xattrs)
1211                 receive_xattr(f, file);
1212 #endif
1213
1214         if (S_ISREG(mode) || S_ISLNK(mode))
1215                 stats.total_size += file_length;
1216
1217         return file;
1218 }
1219
1220 /* Create a file_struct for a named file by reading its stat() information
1221  * and performing extensive checks against global options.
1222  *
1223  * Returns a pointer to the new file struct, or NULL if there was an error
1224  * or this file should be excluded.
1225  *
1226  * Note: Any error (here or in send_file_name) that results in the omission of
1227  * an existent source file from the file list should set
1228  * "io_error |= IOERR_GENERAL" to avoid deletion of the file from the
1229  * destination if --delete is on. */
1230 struct file_struct *make_file(const char *fname, struct file_list *flist,
1231                               STRUCT_STAT *stp, int flags, int filter_level)
1232 {
1233         static char *lastdir;
1234         static int lastdir_len = -1;
1235         struct file_struct *file;
1236         char thisname[MAXPATHLEN];
1237         char linkname[MAXPATHLEN];
1238         int alloc_len, basename_len, linkname_len;
1239         int extra_len = file_extra_cnt * EXTRA_LEN;
1240         const char *basename;
1241         alloc_pool_t *pool;
1242         STRUCT_STAT st;
1243         char *bp;
1244
1245         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1246                 io_error |= IOERR_GENERAL;
1247                 rprintf(FERROR_XFER, "skipping overly long name: %s\n", fname);
1248                 return NULL;
1249         }
1250         clean_fname(thisname, 0);
1251         if (sanitize_paths)
1252                 sanitize_path(thisname, thisname, "", 0, SP_DEFAULT);
1253
1254         if (stp && (S_ISDIR(stp->st_mode) || IS_MISSING_FILE(*stp))) {
1255                 /* This is needed to handle a "symlink/." with a --relative
1256                  * dir, or a request to delete a specific file. */
1257                 st = *stp;
1258                 *linkname = '\0'; /* make IBM code checker happy */
1259         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1260                 int save_errno = errno;
1261                 /* See if file is excluded before reporting an error. */
1262                 if (filter_level != NO_FILTERS
1263                  && (is_excluded(thisname, 0, filter_level)
1264                   || is_excluded(thisname, 1, filter_level))) {
1265                         if (ignore_perishable && save_errno != ENOENT)
1266                                 non_perishable_cnt++;
1267                         return NULL;
1268                 }
1269                 if (save_errno == ENOENT) {
1270 #ifdef SUPPORT_LINKS
1271                         /* When our options tell us to follow a symlink that
1272                          * points nowhere, tell the user about the symlink
1273                          * instead of giving a "vanished" message.  We only
1274                          * dereference a symlink if one of the --copy*links
1275                          * options was specified, so there's no need for the
1276                          * extra lstat() if one of these options isn't on. */
1277                         if ((copy_links || copy_unsafe_links || copy_dirlinks)
1278                          && x_lstat(thisname, &st, NULL) == 0
1279                          && S_ISLNK(st.st_mode)) {
1280                                 io_error |= IOERR_GENERAL;
1281                                 rprintf(FERROR_XFER, "symlink has no referent: %s\n",
1282                                         full_fname(thisname));
1283                         } else
1284 #endif
1285                         {
1286                                 enum logcode c = am_daemon && protocol_version < 28
1287                                                ? FERROR : FWARNING;
1288                                 io_error |= IOERR_VANISHED;
1289                                 rprintf(c, "file has vanished: %s\n",
1290                                         full_fname(thisname));
1291                         }
1292                 } else {
1293                         io_error |= IOERR_GENERAL;
1294                         rsyserr(FERROR_XFER, save_errno, "readlink_stat(%s) failed",
1295                                 full_fname(thisname));
1296                 }
1297                 return NULL;
1298         } else if (IS_MISSING_FILE(st)) {
1299                 io_error |= IOERR_GENERAL;
1300                 rprintf(FINFO, "skipping file with bogus (zero) st_mode: %s\n",
1301                         full_fname(thisname));
1302                 return NULL;
1303         }
1304
1305         if (filter_level == NO_FILTERS)
1306                 goto skip_filters;
1307
1308         if (S_ISDIR(st.st_mode)) {
1309                 if (!xfer_dirs) {
1310                         rprintf(FINFO, "skipping directory %s\n", thisname);
1311                         return NULL;
1312                 }
1313                 /* -x only affects dirs because we need to avoid recursing
1314                  * into a mount-point directory, not to avoid copying a
1315                  * symlinked file if -L (or similar) was specified. */
1316                 if (one_file_system && st.st_dev != filesystem_dev
1317                  && BITS_SETnUNSET(flags, FLAG_CONTENT_DIR, FLAG_TOP_DIR)) {
1318                         if (one_file_system > 1) {
1319                                 if (INFO_GTE(MOUNT, 1)) {
1320                                         rprintf(FINFO,
1321                                             "[%s] skipping mount-point dir %s\n",
1322                                             who_am_i(), thisname);
1323                                 }
1324                                 return NULL;
1325                         }
1326                         flags |= FLAG_MOUNT_DIR;
1327                         flags &= ~FLAG_CONTENT_DIR;
1328                 }
1329         } else
1330                 flags &= ~FLAG_CONTENT_DIR;
1331
1332         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1333                 if (ignore_perishable)
1334                         non_perishable_cnt++;
1335                 return NULL;
1336         }
1337
1338         if (lp_ignore_nonreadable(module_id)) {
1339 #ifdef SUPPORT_LINKS
1340                 if (!S_ISLNK(st.st_mode))
1341 #endif
1342                         if (access(thisname, R_OK) != 0)
1343                                 return NULL;
1344         }
1345
1346   skip_filters:
1347
1348         /* Only divert a directory in the main transfer. */
1349         if (flist) {
1350                 if (flist->prev && S_ISDIR(st.st_mode)
1351                  && flags & FLAG_DIVERT_DIRS) {
1352                         /* Room for parent/sibling/next-child info. */
1353                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1354                         if (relative_paths)
1355                                 extra_len += PTR_EXTRA_CNT * EXTRA_LEN;
1356                         pool = dir_flist->file_pool;
1357                 } else
1358                         pool = flist->file_pool;
1359         } else {
1360 #ifdef SUPPORT_ACLS
1361                 /* Directories need an extra int32 for the default ACL. */
1362                 if (preserve_acls && S_ISDIR(st.st_mode))
1363                         extra_len += EXTRA_LEN;
1364 #endif
1365                 pool = NULL;
1366         }
1367
1368         if (DEBUG_GTE(FLIST, 2)) {
1369                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1370                         who_am_i(), thisname, filter_level);
1371         }
1372
1373         if ((basename = strrchr(thisname, '/')) != NULL) {
1374                 int len = basename++ - thisname;
1375                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1376                         lastdir = new_array(char, len + 1);
1377                         memcpy(lastdir, thisname, len);
1378                         lastdir[len] = '\0';
1379                         lastdir_len = len;
1380                 }
1381         } else
1382                 basename = thisname;
1383         basename_len = strlen(basename) + 1; /* count the '\0' */
1384
1385 #ifdef SUPPORT_LINKS
1386         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1387 #else
1388         linkname_len = 0;
1389 #endif
1390
1391         if (copy_devices && am_sender && IS_DEVICE(st.st_mode)) {
1392                 if (st.st_size == 0) {
1393                         int fd = do_open(fname, O_RDONLY, 0);
1394                         if (fd >= 0) {
1395                                 st.st_size = get_device_size(fd, fname);
1396                                 close(fd);
1397                         }
1398                 }
1399                 st.st_mode = S_IFREG | (st.st_mode & ACCESSPERMS);
1400                 st.st_mtime = time(NULL); /* The mtime on the device is not up-to-date, so set it to "now". */
1401         }
1402
1403 #ifdef ST_MTIME_NSEC
1404         if (st.ST_MTIME_NSEC && protocol_version >= 31)
1405                 extra_len += EXTRA_LEN;
1406 #endif
1407 #if SIZEOF_CAPITAL_OFF_T >= 8
1408         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1409                 extra_len += EXTRA_LEN;
1410 #endif
1411
1412         if (always_checksum && am_sender && S_ISREG(st.st_mode)) {
1413                 file_checksum(thisname, &st, tmp_sum);
1414                 if (sender_keeps_checksum)
1415                         extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
1416         }
1417
1418 #if EXTRA_ROUNDING > 0
1419         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1420                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1421 #endif
1422
1423         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1424                   + linkname_len;
1425         if (pool)
1426                 bp = pool_alloc(pool, alloc_len, "make_file");
1427         else
1428                 bp = new_array(char, alloc_len);
1429
1430         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1431         bp += extra_len;
1432         file = (struct file_struct *)bp;
1433         bp += FILE_STRUCT_LEN;
1434
1435         memcpy(bp, basename, basename_len);
1436
1437 #ifdef SUPPORT_HARD_LINKS
1438         if (preserve_hard_links && flist && flist->prev) {
1439                 if (protocol_version >= 28
1440                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1441                  : S_ISREG(st.st_mode)) {
1442                         tmp_dev = (int64)st.st_dev;
1443                         tmp_ino = (int64)st.st_ino;
1444                 } else
1445                         tmp_dev = -1;
1446         }
1447 #endif
1448
1449 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1450         if (IS_DEVICE(st.st_mode)) {
1451                 tmp_rdev = st.st_rdev;
1452                 st.st_size = 0;
1453         } else if (IS_SPECIAL(st.st_mode))
1454                 st.st_size = 0;
1455 #endif
1456
1457         file->flags = flags;
1458         file->modtime = st.st_mtime;
1459 #ifdef ST_MTIME_NSEC
1460         if (st.ST_MTIME_NSEC && protocol_version >= 31) {
1461                 file->flags |= FLAG_MOD_NSEC;
1462                 F_MOD_NSEC(file) = st.ST_MTIME_NSEC;
1463         }
1464 #endif
1465         file->len32 = (uint32)st.st_size;
1466 #if SIZEOF_CAPITAL_OFF_T >= 8
1467         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1468                 file->flags |= FLAG_LENGTH64;
1469                 F_HIGH_LEN(file) = (uint32)(st.st_size >> 32);
1470         }
1471 #endif
1472         file->mode = st.st_mode;
1473         if (preserve_uid)
1474                 F_OWNER(file) = st.st_uid;
1475         if (preserve_gid)
1476                 F_GROUP(file) = st.st_gid;
1477         if (am_generator && st.st_uid == our_uid)
1478                 file->flags |= FLAG_OWNED_BY_US;
1479         if (atimes_ndx && !S_ISDIR(file->mode))
1480                 F_ATIME(file) = st.st_atime;
1481 #ifdef SUPPORT_CRTIMES
1482         if (crtimes_ndx)
1483                 F_CRTIME(file) = get_create_time(fname, &st);
1484 #endif
1485
1486         if (basename != thisname)
1487                 file->dirname = lastdir;
1488
1489 #ifdef SUPPORT_LINKS
1490         if (linkname_len)
1491                 memcpy(bp + basename_len, linkname, linkname_len);
1492 #endif
1493
1494         if (am_sender)
1495                 F_PATHNAME(file) = pathname;
1496         else if (!pool)
1497                 F_DEPTH(file) = extra_len / EXTRA_LEN;
1498
1499         if (basename_len == 0+1) {
1500                 if (!pool)
1501                         unmake_file(file);
1502                 return NULL;
1503         }
1504
1505         if (sender_keeps_checksum && S_ISREG(st.st_mode))
1506                 memcpy(F_SUM(file), tmp_sum, flist_csum_len);
1507
1508         if (unsort_ndx)
1509                 F_NDX(file) = stats.num_dirs;
1510
1511         return file;
1512 }
1513
1514 OFF_T get_device_size(int fd, const char *fname)
1515 {
1516         OFF_T off = lseek(fd, 0, SEEK_END);
1517
1518         if (off == (OFF_T) -1) {
1519                 rsyserr(FERROR, errno, "failed to get device size via seek: %s", fname);
1520                 return 0;
1521         }
1522         if (lseek(fd, 0, SEEK_SET) != 0)
1523                 rsyserr(FERROR, errno, "failed to seek device back to start: %s", fname);
1524
1525         return off;
1526 }
1527
1528 /* Only called for temporary file_struct entries created by make_file(). */
1529 void unmake_file(struct file_struct *file)
1530 {
1531         free(REQ_EXTRA(file, F_DEPTH(file)));
1532 }
1533
1534 static struct file_struct *send_file_name(int f, struct file_list *flist,
1535                                           const char *fname, STRUCT_STAT *stp,
1536                                           int flags, int filter_level)
1537 {
1538         struct file_struct *file;
1539
1540         file = make_file(fname, flist, stp, flags, filter_level);
1541         if (!file)
1542                 return NULL;
1543
1544         if (chmod_modes && !S_ISLNK(file->mode) && file->mode)
1545                 file->mode = tweak_mode(file->mode, chmod_modes);
1546
1547         if (f >= 0) {
1548                 char fbuf[MAXPATHLEN];
1549 #ifdef SUPPORT_LINKS
1550                 const char *symlink_name;
1551                 int symlink_len;
1552 #ifdef ICONV_OPTION
1553                 char symlink_buf[MAXPATHLEN];
1554 #endif
1555 #endif
1556 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1557                 stat_x sx;
1558                 init_stat_x(&sx);
1559 #endif
1560
1561 #ifdef SUPPORT_LINKS
1562                 if (preserve_links && S_ISLNK(file->mode)) {
1563                         symlink_name = F_SYMLINK(file);
1564                         symlink_len = strlen(symlink_name);
1565                         if (symlink_len == 0) {
1566                                 io_error |= IOERR_GENERAL;
1567                                 f_name(file, fbuf);
1568                                 rprintf(FERROR_XFER,
1569                                     "skipping symlink with 0-length value: %s\n",
1570                                     full_fname(fbuf));
1571                                 return NULL;
1572                         }
1573                 } else {
1574                         symlink_name = NULL;
1575                         symlink_len = 0;
1576                 }
1577 #endif
1578
1579 #ifdef ICONV_OPTION
1580                 if (ic_send != (iconv_t)-1) {
1581                         xbuf outbuf, inbuf;
1582
1583                         INIT_CONST_XBUF(outbuf, fbuf);
1584
1585                         if (file->dirname) {
1586                                 INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
1587                                 outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
1588                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0)
1589                                         goto convert_error;
1590                                 outbuf.size += 2;
1591                                 fbuf[outbuf.len++] = '/';
1592                         }
1593
1594                         INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
1595                         if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1596                           convert_error:
1597                                 io_error |= IOERR_GENERAL;
1598                                 rprintf(FERROR_XFER,
1599                                     "[%s] cannot convert filename: %s (%s)\n",
1600                                     who_am_i(), f_name(file, fbuf), strerror(errno));
1601                                 return NULL;
1602                         }
1603                         fbuf[outbuf.len] = '\0';
1604
1605 #ifdef SUPPORT_LINKS
1606                         if (symlink_len && sender_symlink_iconv) {
1607                                 INIT_XBUF(inbuf, (char*)symlink_name, symlink_len, (size_t)-1);
1608                                 INIT_CONST_XBUF(outbuf, symlink_buf);
1609                                 if (iconvbufs(ic_send, &inbuf, &outbuf, ICB_INIT) < 0) {
1610                                         io_error |= IOERR_GENERAL;
1611                                         f_name(file, fbuf);
1612                                         rprintf(FERROR_XFER,
1613                                             "[%s] cannot convert symlink data for: %s (%s)\n",
1614                                             who_am_i(), full_fname(fbuf), strerror(errno));
1615                                         return NULL;
1616                                 }
1617                                 symlink_buf[outbuf.len] = '\0';
1618
1619                                 symlink_name = symlink_buf;
1620                                 symlink_len = outbuf.len;
1621                         }
1622 #endif
1623                 } else
1624 #endif
1625                         f_name(file, fbuf);
1626
1627 #ifdef SUPPORT_ACLS
1628                 if (preserve_acls && !S_ISLNK(file->mode)) {
1629                         sx.st.st_mode = file->mode;
1630                         if (get_acl(fname, &sx) < 0) {
1631                                 io_error |= IOERR_GENERAL;
1632                                 return NULL;
1633                         }
1634                 }
1635 #endif
1636 #ifdef SUPPORT_XATTRS
1637                 if (preserve_xattrs) {
1638                         sx.st.st_mode = file->mode;
1639                         if (get_xattr(fname, &sx) < 0) {
1640                                 io_error |= IOERR_GENERAL;
1641                                 return NULL;
1642                         }
1643                 }
1644 #endif
1645
1646                 send_file_entry(f, fbuf, file,
1647 #ifdef SUPPORT_LINKS
1648                                 symlink_name, symlink_len,
1649 #endif
1650                                 flist->used, flist->ndx_start);
1651
1652 #ifdef SUPPORT_ACLS
1653                 if (preserve_acls && !S_ISLNK(file->mode)) {
1654                         send_acl(f, &sx);
1655                         free_acl(&sx);
1656                 }
1657 #endif
1658 #ifdef SUPPORT_XATTRS
1659                 if (preserve_xattrs) {
1660                         F_XATTR(file) = send_xattr(f, &sx);
1661                         free_xattr(&sx);
1662                 }
1663 #endif
1664         }
1665
1666         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1667
1668         flist_expand(flist, 1);
1669         flist->files[flist->used++] = file;
1670
1671         return file;
1672 }
1673
1674 static void send_if_directory(int f, struct file_list *flist,
1675                               struct file_struct *file,
1676                               char *fbuf, unsigned int ol,
1677                               int flags)
1678 {
1679         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1680
1681         if (S_ISDIR(file->mode)
1682             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1683                 void *save_filters;
1684                 unsigned int len = strlen(fbuf);
1685                 if (len > 1 && fbuf[len-1] == '/')
1686                         fbuf[--len] = '\0';
1687                 save_filters = push_local_filters(fbuf, len);
1688                 send_directory(f, flist, fbuf, len, flags);
1689                 pop_local_filters(save_filters);
1690                 fbuf[ol] = '\0';
1691                 if (is_dot_dir)
1692                         fbuf[ol-1] = '.';
1693         }
1694 }
1695
1696 static int file_compare(const void *file1, const void *file2)
1697 {
1698         return f_name_cmp(*(struct file_struct **)file1,
1699                           *(struct file_struct **)file2);
1700 }
1701
1702 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1703  * version, but I (Wayne) changed the merge code to do less copying and
1704  * to require only half the amount of temporary memory. */
1705 static void fsort_tmp(struct file_struct **fp, size_t num,
1706                       struct file_struct **tmp)
1707 {
1708         struct file_struct **f1, **f2, **t;
1709         size_t n1, n2;
1710
1711         n1 = num / 2;
1712         n2 = num - n1;
1713         f1 = fp;
1714         f2 = fp + n1;
1715
1716         if (n1 > 1)
1717                 fsort_tmp(f1, n1, tmp);
1718         if (n2 > 1)
1719                 fsort_tmp(f2, n2, tmp);
1720
1721         while (f_name_cmp(*f1, *f2) <= 0) {
1722                 if (!--n1)
1723                         return;
1724                 f1++;
1725         }
1726
1727         t = tmp;
1728         memcpy(t, f1, n1 * PTR_SIZE);
1729
1730         *f1++ = *f2++, n2--;
1731
1732         while (n1 > 0 && n2 > 0) {
1733                 if (f_name_cmp(*t, *f2) <= 0)
1734                         *f1++ = *t++, n1--;
1735                 else
1736                         *f1++ = *f2++, n2--;
1737         }
1738
1739         if (n1 > 0)
1740                 memcpy(f1, t, n1 * PTR_SIZE);
1741 }
1742
1743 /* This file-struct sorting routine makes sure that any identical names in
1744  * the file list stay in the same order as they were in the original list.
1745  * This is particularly vital in inc_recurse mode where we expect a sort
1746  * on the flist to match the exact order of a sort on the dir_flist. */
1747 static void fsort(struct file_struct **fp, size_t num)
1748 {
1749         if (num <= 1)
1750                 return;
1751
1752         if (use_qsort)
1753                 qsort(fp, num, PTR_SIZE, file_compare);
1754         else {
1755                 struct file_struct **tmp = new_array(struct file_struct *, (num+1) / 2);
1756                 fsort_tmp(fp, num, tmp);
1757                 free(tmp);
1758         }
1759 }
1760
1761 /* We take an entire set of sibling dirs from the sorted flist and link them
1762  * into the tree, setting the appropriate parent/child/sibling pointers. */
1763 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1764                              int dir_cnt)
1765 {
1766         int i;
1767         int32 *dp = NULL;
1768         int32 *parent_dp = parent_ndx < 0 ? NULL
1769                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1770
1771         /* The sending side is adding entries to dir_flist in sorted order, so sorted & files are the same. */
1772         flist_expand(dir_flist, dir_cnt);
1773         dir_flist->sorted = dir_flist->files;
1774
1775         for (i = 0; dir_cnt; i++) {
1776                 struct file_struct *file = from_flist->sorted[i];
1777
1778                 if (!S_ISDIR(file->mode))
1779                         continue;
1780
1781                 dir_flist->files[dir_flist->used++] = file;
1782                 dir_cnt--;
1783
1784                 if (file->basename[0] == '.' && file->basename[1] == '\0')
1785                         continue;
1786
1787                 if (dp)
1788                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1789                 else if (parent_dp)
1790                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1791                 else
1792                         send_dir_ndx = dir_flist->used - 1;
1793
1794                 dp = F_DIR_NODE_P(file);
1795                 DIR_PARENT(dp) = parent_ndx;
1796                 DIR_FIRST_CHILD(dp) = -1;
1797         }
1798         if (dp)
1799                 DIR_NEXT_SIBLING(dp) = -1;
1800 }
1801
1802 static void interpret_stat_error(const char *fname, int is_dir)
1803 {
1804         if (errno == ENOENT) {
1805                 io_error |= IOERR_VANISHED;
1806                 rprintf(FWARNING, "%s has vanished: %s\n",
1807                         is_dir ? "directory" : "file", full_fname(fname));
1808         } else {
1809                 io_error |= IOERR_GENERAL;
1810                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
1811                         full_fname(fname));
1812         }
1813 }
1814
1815 /* This function is normally called by the sender, but the receiving side also
1816  * calls it from get_dirlist() with f set to -1 so that we just construct the
1817  * file list in memory without sending it over the wire.  Also, get_dirlist()
1818  * might call this with f set to -2, which also indicates that local filter
1819  * rules should be ignored. */
1820 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1821                            int flags)
1822 {
1823         struct dirent *di;
1824         unsigned remainder;
1825         char *p;
1826         DIR *d;
1827         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1828         int start = flist->used;
1829         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1830
1831         assert(flist != NULL);
1832
1833         if (!(d = opendir(fbuf))) {
1834                 if (errno == ENOENT) {
1835                         if (am_sender) /* Can abuse this for vanished error w/ENOENT: */
1836                                 interpret_stat_error(fbuf, True);
1837                         return;
1838                 }
1839                 if (errno == ENOTDIR && (flags & FLAG_PERHAPS_DIR))
1840                         return;
1841                 io_error |= IOERR_GENERAL;
1842                 rsyserr(FERROR_XFER, errno, "opendir %s failed", full_fname(fbuf));
1843                 return;
1844         }
1845
1846         p = fbuf + len;
1847         if (len == 1 && *fbuf == '/')
1848                 remainder = MAXPATHLEN - 1;
1849         else if (len < MAXPATHLEN-1) {
1850                 *p++ = '/';
1851                 *p = '\0';
1852                 remainder = MAXPATHLEN - (len + 1);
1853         } else
1854                 remainder = 0;
1855
1856         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1857                 unsigned name_len;
1858                 char *dname = d_name(di);
1859                 if (dname[0] == '.' && (dname[1] == '\0'
1860                     || (dname[1] == '.' && dname[2] == '\0')))
1861                         continue;
1862                 name_len = strlcpy(p, dname, remainder);
1863                 if (name_len >= remainder) {
1864                         char save = fbuf[len];
1865                         fbuf[len] = '\0';
1866                         io_error |= IOERR_GENERAL;
1867                         rprintf(FERROR_XFER,
1868                                 "filename overflows max-path len by %u: %s/%s\n",
1869                                 name_len - remainder + 1, fbuf, dname);
1870                         fbuf[len] = save;
1871                         continue;
1872                 }
1873                 if (dname[0] == '\0') {
1874                         io_error |= IOERR_GENERAL;
1875                         rprintf(FERROR_XFER,
1876                                 "cannot send file with empty name in %s\n",
1877                                 full_fname(fbuf));
1878                         continue;
1879                 }
1880
1881                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1882         }
1883
1884         fbuf[len] = '\0';
1885
1886         if (errno) {
1887                 io_error |= IOERR_GENERAL;
1888                 rsyserr(FERROR_XFER, errno, "readdir(%s)", full_fname(fbuf));
1889         }
1890
1891         closedir(d);
1892
1893         if (f >= 0 && recurse && !divert_dirs) {
1894                 int i, end = flist->used - 1;
1895                 /* send_if_directory() bumps flist->used, so use "end". */
1896                 for (i = start; i <= end; i++)
1897                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1898         }
1899 }
1900
1901 static void send_implied_dirs(int f, struct file_list *flist, char *fname,
1902                               char *start, char *limit, int flags, char name_type)
1903 {
1904         static char lastpath[MAXPATHLEN] = "";
1905         static int lastpath_len = 0;
1906         static struct file_struct *lastpath_struct = NULL;
1907         struct file_struct *file;
1908         item_list *relname_list;
1909         relnamecache **rnpp;
1910         int len, need_new_dir, depth = 0;
1911         filter_rule_list save_filter_list = filter_list;
1912
1913         flags = (flags | FLAG_IMPLIED_DIR) & ~(FLAG_TOP_DIR | FLAG_CONTENT_DIR);
1914         filter_list.head = filter_list.tail = NULL; /* Don't filter implied dirs. */
1915
1916         if (inc_recurse) {
1917                 if (lastpath_struct && F_PATHNAME(lastpath_struct) == pathname
1918                  && lastpath_len == limit - fname
1919                  && strncmp(lastpath, fname, lastpath_len) == 0)
1920                         need_new_dir = 0;
1921                 else
1922                         need_new_dir = 1;
1923         } else {
1924                 char *tp = fname, *lp = lastpath;
1925                 /* Skip any initial directories in our path that we
1926                  * have in common with lastpath. */
1927                 assert(start == fname);
1928                 for ( ; ; tp++, lp++) {
1929                         if (tp == limit) {
1930                                 if (*lp == '/' || *lp == '\0')
1931                                         goto done;
1932                                 break;
1933                         }
1934                         if (*lp != *tp)
1935                                 break;
1936                         if (*tp == '/') {
1937                                 start = tp;
1938                                 depth++;
1939                         }
1940                 }
1941                 need_new_dir = 1;
1942         }
1943
1944         if (need_new_dir) {
1945                 int save_copy_links = copy_links;
1946                 int save_xfer_dirs = xfer_dirs;
1947                 char *slash;
1948
1949                 copy_links = xfer_dirs = 1;
1950
1951                 *limit = '\0';
1952
1953                 for (slash = start; (slash = strchr(slash+1, '/')) != NULL; ) {
1954                         *slash = '\0';
1955                         file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1956                         depth++;
1957                         if (!inc_recurse && file && S_ISDIR(file->mode))
1958                                 change_local_filter_dir(fname, strlen(fname), depth);
1959                         *slash = '/';
1960                 }
1961
1962                 file = send_file_name(f, flist, fname, NULL, flags, ALL_FILTERS);
1963                 if (inc_recurse) {
1964                         if (file && !S_ISDIR(file->mode))
1965                                 file = NULL;
1966                         lastpath_struct = file;
1967                 } else if (file && S_ISDIR(file->mode))
1968                         change_local_filter_dir(fname, strlen(fname), ++depth);
1969
1970                 strlcpy(lastpath, fname, sizeof lastpath);
1971                 lastpath_len = limit - fname;
1972
1973                 *limit = '/';
1974
1975                 copy_links = save_copy_links;
1976                 xfer_dirs = save_xfer_dirs;
1977
1978                 if (!inc_recurse)
1979                         goto done;
1980         }
1981
1982         if (!lastpath_struct)
1983                 goto done; /* dir must have vanished */
1984
1985         len = strlen(limit+1);
1986         memcpy(&relname_list, F_DIR_RELNAMES_P(lastpath_struct), sizeof relname_list);
1987         if (!relname_list) {
1988                 relname_list = new0(item_list);
1989                 memcpy(F_DIR_RELNAMES_P(lastpath_struct), &relname_list, sizeof relname_list);
1990         }
1991         rnpp = EXPAND_ITEM_LIST(relname_list, relnamecache *, 32);
1992         *rnpp = (relnamecache*)new_array(char, RELNAMECACHE_LEN + len + 1);
1993         (*rnpp)->name_type = name_type;
1994         strlcpy((*rnpp)->fname, limit+1, len + 1);
1995
1996 done:
1997         filter_list = save_filter_list;
1998 }
1999
2000 static NORETURN void fatal_unsafe_io_error(void)
2001 {
2002         /* This (sadly) can only happen when pushing data because
2003          * the sender does not know about what kind of delete
2004          * is in effect on the receiving side when pulling. */
2005         rprintf(FERROR_XFER, "FATAL I/O ERROR: dying to avoid a --delete-%s issue with a pre-3.0.7 receiver.\n",
2006                 delete_during == 2 ? "delay" : "during");
2007         exit_cleanup(RERR_UNSUPPORTED);
2008 }
2009
2010 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
2011 {
2012         char fbuf[MAXPATHLEN];
2013         item_list *relname_list;
2014         int len, dlen, flags = FLAG_DIVERT_DIRS | FLAG_CONTENT_DIR;
2015         size_t j;
2016
2017         f_name(file, fbuf);
2018         dlen = strlen(fbuf);
2019
2020         if (!change_pathname(file, NULL, 0))
2021                 exit_cleanup(RERR_FILESELECT);
2022
2023         change_local_filter_dir(fbuf, dlen, send_dir_depth);
2024
2025         if (file->flags & FLAG_CONTENT_DIR) {
2026                 if (one_file_system) {
2027                         STRUCT_STAT st;
2028                         if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
2029                                 interpret_stat_error(fbuf, True);
2030                                 return;
2031                         }
2032                         filesystem_dev = st.st_dev;
2033                 }
2034                 send_directory(f, flist, fbuf, dlen, flags);
2035         }
2036
2037         if (!relative_paths)
2038                 return;
2039
2040         memcpy(&relname_list, F_DIR_RELNAMES_P(file), sizeof relname_list);
2041         if (!relname_list)
2042                 return;
2043
2044         for (j = 0; j < relname_list->count; j++) {
2045                 char *slash;
2046                 relnamecache *rnp = ((relnamecache**)relname_list->items)[j];
2047                 char name_type = rnp->name_type;
2048
2049                 fbuf[dlen] = '/';
2050                 len = strlcpy(fbuf + dlen + 1, rnp->fname, sizeof fbuf - dlen - 1);
2051                 free(rnp);
2052                 if (len >= (int)sizeof fbuf)
2053                         continue; /* Impossible... */
2054
2055                 slash = strchr(fbuf+dlen+1, '/');
2056                 if (slash) {
2057                         send_implied_dirs(f, flist, fbuf, fbuf+dlen+1, slash, flags, name_type);
2058                         continue;
2059                 }
2060
2061                 if (name_type != NORMAL_NAME) {
2062                         STRUCT_STAT st;
2063                         if (name_type == MISSING_NAME)
2064                                 memset(&st, 0, sizeof st);
2065                         else if (link_stat(fbuf, &st, 1) != 0) {
2066                                 interpret_stat_error(fbuf, True);
2067                                 continue;
2068                         }
2069                         send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR | flags, ALL_FILTERS);
2070                 } else
2071                         send_file_name(f, flist, fbuf, NULL, FLAG_TOP_DIR | flags, ALL_FILTERS);
2072         }
2073
2074         free(relname_list);
2075 }
2076
2077 static void write_end_of_flist(int f, int send_io_error)
2078 {
2079         if (xfer_flags_as_varint) {
2080                 write_varint(f, 0);
2081                 write_varint(f, send_io_error ? io_error : 0);
2082         } else if (send_io_error) {
2083                 write_shortint(f, XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST);
2084                 write_varint(f, io_error);
2085         } else
2086                 write_byte(f, 0);
2087 }
2088
2089 void send_extra_file_list(int f, int at_least)
2090 {
2091         struct file_list *flist;
2092         int64 start_write;
2093         uint16 prev_flags;
2094         int save_io_error = io_error;
2095
2096         if (flist_eof)
2097                 return;
2098
2099         if (at_least < 0)
2100                 at_least = file_total - file_old_total + 1;
2101
2102         /* Keep sending data until we have the requested number of
2103          * files in the upcoming file-lists. */
2104         while (file_total - file_old_total < at_least) {
2105                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
2106                 int dir_ndx, dstart = stats.num_dirs;
2107                 const char *pathname = F_PATHNAME(file);
2108                 int32 *dp;
2109
2110                 flist = flist_new(0, "send_extra_file_list");
2111                 start_write = stats.total_written;
2112
2113                 if (unsort_ndx)
2114                         dir_ndx = F_NDX(file);
2115                 else
2116                         dir_ndx = send_dir_ndx;
2117                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
2118                 flist->parent_ndx = send_dir_ndx; /* the sending side must remember the sorted ndx value */
2119
2120                 send1extra(f, file, flist);
2121                 prev_flags = file->flags;
2122                 dp = F_DIR_NODE_P(file);
2123
2124                 /* If there are any duplicate directory names that follow, we
2125                  * send all the dirs together in one file-list.  The dir_flist
2126                  * tree links all the child subdirs onto the last dup dir. */
2127                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
2128                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
2129                         send_dir_ndx = dir_ndx;
2130                         file = dir_flist->sorted[dir_ndx];
2131                         /* Try to avoid some duplicate scanning of identical dirs. */
2132                         if (F_PATHNAME(file) == pathname && prev_flags & FLAG_CONTENT_DIR)
2133                                 file->flags &= ~FLAG_CONTENT_DIR;
2134                         send1extra(f, file, flist);
2135                         prev_flags = file->flags;
2136                         dp = F_DIR_NODE_P(file);
2137                 }
2138
2139                 if (io_error == save_io_error || ignore_errors)
2140                         write_end_of_flist(f, 0);
2141                 else if (use_safe_inc_flist)
2142                         write_end_of_flist(f, 1);
2143                 else {
2144                         if (delete_during)
2145                                 fatal_unsafe_io_error();
2146                         write_end_of_flist(f, 0);
2147                 }
2148
2149                 if (need_unsorted_flist) {
2150                         flist->sorted = new_array(struct file_struct *, flist->used);
2151                         memcpy(flist->sorted, flist->files, flist->used * PTR_SIZE);
2152                 } else
2153                         flist->sorted = flist->files;
2154
2155                 flist_sort_and_clean(flist, 0);
2156
2157                 add_dirs_to_tree(send_dir_ndx, flist, stats.num_dirs - dstart);
2158                 flist_done_allocating(flist);
2159
2160                 file_total += flist->used;
2161                 stats.flist_size += stats.total_written - start_write;
2162                 stats.num_files += flist->used;
2163                 if (DEBUG_GTE(FLIST, 3))
2164                         output_flist(flist);
2165
2166                 if (DIR_FIRST_CHILD(dp) >= 0) {
2167                         send_dir_ndx = DIR_FIRST_CHILD(dp);
2168                         send_dir_depth++;
2169                 } else {
2170                         while (DIR_NEXT_SIBLING(dp) < 0) {
2171                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
2172                                         write_ndx(f, NDX_FLIST_EOF);
2173                                         flist_eof = 1;
2174                                         if (DEBUG_GTE(FLIST, 3))
2175                                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2176                                         change_local_filter_dir(NULL, 0, 0);
2177                                         goto finish;
2178                                 }
2179                                 send_dir_depth--;
2180                                 file = dir_flist->sorted[send_dir_ndx];
2181                                 dp = F_DIR_NODE_P(file);
2182                         }
2183                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
2184                 }
2185         }
2186
2187   finish:
2188         if (io_error != save_io_error && protocol_version == 30 && !ignore_errors)
2189                 send_msg_int(MSG_IO_ERROR, io_error);
2190 }
2191
2192 struct file_list *send_file_list(int f, int argc, char *argv[])
2193 {
2194         static const char *lastdir;
2195         static int lastdir_len = -1;
2196         int len, dirlen;
2197         STRUCT_STAT st;
2198         char *p, *dir;
2199         struct file_list *flist;
2200         struct timeval start_tv, end_tv;
2201         int64 start_write;
2202         int use_ff_fd = 0;
2203         int disable_buffering, reenable_multiplex = -1;
2204         int flags = recurse ? FLAG_CONTENT_DIR : 0;
2205         int reading_remotely = filesfrom_host != NULL;
2206         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
2207 #ifdef ICONV_OPTION
2208                      | (filesfrom_convert ? RL_CONVERT : 0)
2209 #endif
2210                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
2211         int implied_dot_dir = 0;
2212
2213         rprintf(FLOG, "building file list\n");
2214         if (show_filelist_progress)
2215                 start_filelist_progress("building file list");
2216         else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2217                 rprintf(FCLIENT, "sending incremental file list\n");
2218
2219         start_write = stats.total_written;
2220         gettimeofday(&start_tv, NULL);
2221
2222         if (relative_paths && protocol_version >= 30)
2223                 implied_dirs = 1; /* We send flagged implied dirs */
2224
2225 #ifdef SUPPORT_HARD_LINKS
2226         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
2227                 init_hard_links();
2228 #endif
2229
2230         flist = cur_flist = flist_new(0, "send_file_list");
2231         flist_expand(flist, FLIST_START_LARGE);
2232         if (inc_recurse) {
2233                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
2234                 flist_expand(dir_flist, FLIST_START_LARGE);
2235                 flags |= FLAG_DIVERT_DIRS;
2236         } else
2237                 dir_flist = cur_flist;
2238
2239         disable_buffering = io_start_buffering_out(f);
2240         if (filesfrom_fd >= 0) {
2241                 if (argv[0] && !change_dir(argv[0], CD_NORMAL)) {
2242                         rsyserr(FERROR_XFER, errno, "change_dir %s failed",
2243                                 full_fname(argv[0]));
2244                         exit_cleanup(RERR_FILESELECT);
2245                 }
2246                 if (protocol_version < 31) {
2247                         /* Older protocols send the files-from data w/o packaging
2248                          * it in multiplexed I/O packets, so temporarily switch
2249                          * to buffered I/O to match this behavior. */
2250                         reenable_multiplex = io_end_multiplex_in(MPLX_TO_BUFFERED);
2251                 }
2252                 use_ff_fd = 1;
2253         }
2254
2255         if (!orig_dir)
2256                 orig_dir = strdup(curr_dir);
2257
2258         while (1) {
2259                 char fbuf[MAXPATHLEN], *fn, name_type;
2260
2261                 if (use_ff_fd) {
2262                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
2263                                 break;
2264                         sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2265                 } else {
2266                         if (argc-- == 0)
2267                                 break;
2268                         strlcpy(fbuf, *argv++, MAXPATHLEN);
2269                         if (sanitize_paths)
2270                                 sanitize_path(fbuf, fbuf, "", 0, SP_KEEP_DOT_DIRS);
2271                 }
2272
2273                 len = strlen(fbuf);
2274                 if (relative_paths) {
2275                         /* We clean up fbuf below. */
2276                         name_type = NORMAL_NAME;
2277                 } else if (!len || fbuf[len - 1] == '/') {
2278                         if (len == 2 && fbuf[0] == '.') {
2279                                 /* Turn "./" into just "." rather than "./." */
2280                                 fbuf[--len] = '\0';
2281                         } else {
2282                                 if (len + 1 >= MAXPATHLEN)
2283                                         overflow_exit("send_file_list");
2284                                 fbuf[len++] = '.';
2285                                 fbuf[len] = '\0';
2286                         }
2287                         name_type = DOTDIR_NAME;
2288                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
2289                     && (len == 2 || fbuf[len-3] == '/')) {
2290                         if (len + 2 >= MAXPATHLEN)
2291                                 overflow_exit("send_file_list");
2292                         fbuf[len++] = '/';
2293                         fbuf[len++] = '.';
2294                         fbuf[len] = '\0';
2295                         name_type = DOTDIR_NAME;
2296                 } else if (fbuf[len-1] == '.' && (len == 1 || fbuf[len-2] == '/'))
2297                         name_type = DOTDIR_NAME;
2298                 else
2299                         name_type = NORMAL_NAME;
2300
2301                 dir = NULL;
2302
2303                 if (!relative_paths) {
2304                         p = strrchr(fbuf, '/');
2305                         if (p) {
2306                                 *p = '\0';
2307                                 if (p == fbuf)
2308                                         dir = "/";
2309                                 else
2310                                         dir = fbuf;
2311                                 len -= p - fbuf + 1;
2312                                 fn = p + 1;
2313                         } else
2314                                 fn = fbuf;
2315                 } else {
2316                         if ((p = strstr(fbuf, "/./")) != NULL) {
2317                                 *p = '\0';
2318                                 if (p == fbuf)
2319                                         dir = "/";
2320                                 else {
2321                                         dir = fbuf;
2322                                         clean_fname(dir, 0);
2323                                 }
2324                                 fn = p + 3;
2325                                 while (*fn == '/')
2326                                         fn++;
2327                                 if (!*fn)
2328                                         *--fn = '\0'; /* ensure room for '.' */
2329                         } else
2330                                 fn = fbuf;
2331                         /* A leading ./ can be used in relative mode to affect
2332                          * the dest dir without its name being in the path. */
2333                         if (*fn == '.' && fn[1] == '/' && fn[2] && !implied_dot_dir)
2334                                 implied_dot_dir = -1;
2335                         len = clean_fname(fn, CFN_KEEP_TRAILING_SLASH
2336                                             | CFN_DROP_TRAILING_DOT_DIR);
2337                         if (len == 1) {
2338                                 if (fn[0] == '/') {
2339                                         fn = "/.";
2340                                         len = 2;
2341                                         name_type = DOTDIR_NAME;
2342                                 } else if (fn[0] == '.')
2343                                         name_type = DOTDIR_NAME;
2344                         } else if (fn[len-1] == '/') {
2345                                 fn[--len] = '\0';
2346                                 if (len == 1 && *fn == '.')
2347                                         name_type = DOTDIR_NAME;
2348                                 else
2349                                         name_type = SLASH_ENDING_NAME;
2350                         }
2351                         /* Reject a ".." dir in the active part of the path. */
2352                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
2353                                 if ((p[2] == '/' || p[2] == '\0')
2354                                  && (p == fn || p[-1] == '/')) {
2355                                         rprintf(FERROR,
2356                                             "found \"..\" dir in relative path: %s\n",
2357                                             fn);
2358                                         exit_cleanup(RERR_SYNTAX);
2359                                 }
2360                         }
2361                 }
2362
2363                 if (!*fn) {
2364                         len = 1;
2365                         fn = ".";
2366                         name_type = DOTDIR_NAME;
2367                 }
2368
2369                 dirlen = dir ? strlen(dir) : 0;
2370                 if (dirlen != lastdir_len || (dirlen && memcmp(lastdir, dir, dirlen) != 0)) {
2371                         if (!change_pathname(NULL, dir, -dirlen))
2372                                 goto bad_path;
2373                         lastdir = pathname;
2374                         lastdir_len = pathname_len;
2375                 } else if (!change_pathname(NULL, lastdir, lastdir_len)) {
2376                     bad_path:
2377                         if (implied_dot_dir < 0)
2378                                 implied_dot_dir = 0;
2379                         continue;
2380                 }
2381
2382                 if (implied_dot_dir < 0) {
2383                         implied_dot_dir = 1;
2384                         send_file_name(f, flist, ".", NULL, (flags | FLAG_IMPLIED_DIR) & ~FLAG_CONTENT_DIR, ALL_FILTERS);
2385                 }
2386
2387                 if (fn != fbuf)
2388                         memmove(fbuf, fn, len + 1);
2389
2390                 if (link_stat(fbuf, &st, copy_dirlinks || name_type != NORMAL_NAME) != 0
2391                  || (name_type != DOTDIR_NAME && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, SERVER_FILTERS))
2392                  || (relative_paths && path_is_daemon_excluded(fbuf, 1))) {
2393                         if (errno != ENOENT || missing_args == 0) {
2394                                 /* This is a transfer error, but inhibit deletion
2395                                  * only if we might be omitting an existing file. */
2396                                 if (errno != ENOENT)
2397                                         io_error |= IOERR_GENERAL;
2398                                 rsyserr(FERROR_XFER, errno, "link_stat %s failed",
2399                                         full_fname(fbuf));
2400                                 continue;
2401                         } else if (missing_args == 1) {
2402                                 /* Just ignore the arg. */
2403                                 continue;
2404                         } else /* (missing_args == 2) */ {
2405                                 /* Send the arg as a "missing" entry with
2406                                  * mode 0, which tells the generator to delete it. */
2407                                 memset(&st, 0, sizeof st);
2408                         }
2409                 }
2410
2411                 /* A dot-dir should not be excluded! */
2412                 if (name_type != DOTDIR_NAME && st.st_mode != 0
2413                  && is_excluded(fbuf, S_ISDIR(st.st_mode) != 0, ALL_FILTERS))
2414                         continue;
2415
2416                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
2417                         rprintf(FINFO, "skipping directory %s\n", fbuf);
2418                         continue;
2419                 }
2420
2421                 if (inc_recurse && relative_paths && *fbuf) {
2422                         if ((p = strchr(fbuf+1, '/')) != NULL) {
2423                                 if (p - fbuf == 1 && *fbuf == '.') {
2424                                         if ((fn = strchr(p+1, '/')) != NULL)
2425                                                 p = fn;
2426                                 } else
2427                                         fn = p;
2428                                 send_implied_dirs(f, flist, fbuf, fbuf, p, flags,
2429                                                   IS_MISSING_FILE(st) ? MISSING_NAME : name_type);
2430                                 if (fn == p)
2431                                         continue;
2432                         }
2433                 } else if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
2434                         /* Send the implied directories at the start of the
2435                          * source spec, so we get their permissions right. */
2436                         send_implied_dirs(f, flist, fbuf, fbuf, p, flags, 0);
2437                 }
2438
2439                 if (one_file_system)
2440                         filesystem_dev = st.st_dev;
2441
2442                 if (recurse || (xfer_dirs && name_type != NORMAL_NAME)) {
2443                         struct file_struct *file;
2444                         file = send_file_name(f, flist, fbuf, &st,
2445                                               FLAG_TOP_DIR | FLAG_CONTENT_DIR | flags,
2446                                               NO_FILTERS);
2447                         if (!file)
2448                                 continue;
2449                         if (inc_recurse) {
2450                                 if (name_type == DOTDIR_NAME) {
2451                                         if (send_dir_depth < 0) {
2452                                                 send_dir_depth = 0;
2453                                                 change_local_filter_dir(fbuf, len, send_dir_depth);
2454                                         }
2455                                         send_directory(f, flist, fbuf, len, flags);
2456                                 }
2457                         } else
2458                                 send_if_directory(f, flist, file, fbuf, len, flags);
2459                 } else
2460                         send_file_name(f, flist, fbuf, &st, flags, NO_FILTERS);
2461         }
2462
2463         if (reenable_multiplex >= 0)
2464                 io_start_multiplex_in(reenable_multiplex);
2465
2466         gettimeofday(&end_tv, NULL);
2467         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2468                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2469         if (stats.flist_buildtime == 0)
2470                 stats.flist_buildtime = 1;
2471         start_tv = end_tv;
2472
2473         /* Indicate end of file list */
2474         if (io_error == 0 || ignore_errors)
2475                 write_end_of_flist(f, 0);
2476         else if (use_safe_inc_flist)
2477                 write_end_of_flist(f, 1);
2478         else {
2479                 if (delete_during && inc_recurse)
2480                         fatal_unsafe_io_error();
2481                 write_end_of_flist(f, 0);
2482         }
2483
2484 #ifdef SUPPORT_HARD_LINKS
2485         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
2486                 idev_destroy();
2487 #endif
2488
2489         if (show_filelist_progress)
2490                 finish_filelist_progress(flist);
2491
2492         gettimeofday(&end_tv, NULL);
2493         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
2494                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
2495
2496         /* When converting names, both sides keep an unsorted file-list array
2497          * because the names will differ on the sending and receiving sides
2498          * (both sides will use the unsorted index number for each item). */
2499
2500         /* Sort the list without removing any duplicates.  This allows the
2501          * receiving side to ask for whatever name it kept.  For incremental
2502          * recursion mode, the sender marks duplicate dirs so that it can
2503          * send them together in a single file-list. */
2504         if (need_unsorted_flist) {
2505                 flist->sorted = new_array(struct file_struct *, flist->used);
2506                 memcpy(flist->sorted, flist->files, flist->used * PTR_SIZE);
2507         } else
2508                 flist->sorted = flist->files;
2509         flist_sort_and_clean(flist, 0);
2510         file_total += flist->used;
2511         file_old_total += flist->used;
2512
2513         if (numeric_ids <= 0 && !inc_recurse)
2514                 send_id_lists(f);
2515
2516         /* send the io_error flag */
2517         if (protocol_version < 30)
2518                 write_int(f, ignore_errors ? 0 : io_error);
2519         else if (!use_safe_inc_flist && io_error && !ignore_errors)
2520                 send_msg_int(MSG_IO_ERROR, io_error);
2521
2522         if (disable_buffering)
2523                 io_end_buffering_out(IOBUF_FREE_BUFS);
2524
2525         stats.flist_size = stats.total_written - start_write;
2526         stats.num_files = flist->used;
2527
2528         if (DEBUG_GTE(FLIST, 3))
2529                 output_flist(flist);
2530
2531         if (DEBUG_GTE(FLIST, 2))
2532                 rprintf(FINFO, "send_file_list done\n");
2533
2534         if (inc_recurse) {
2535                 send_dir_depth = 1;
2536                 add_dirs_to_tree(-1, flist, stats.num_dirs);
2537                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2538                         flist->parent_ndx = -1;
2539                 flist_done_allocating(flist);
2540                 if (send_dir_ndx < 0) {
2541                         write_ndx(f, NDX_FLIST_EOF);
2542                         flist_eof = 1;
2543                         if (DEBUG_GTE(FLIST, 3))
2544                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2545                 }
2546                 else if (file_total == 1) {
2547                         /* If we're creating incremental file-lists and there
2548                          * was just 1 item in the first file-list, send 1 more
2549                          * file-list to check if this is a 1-file xfer. */
2550                         send_extra_file_list(f, 1);
2551                 }
2552         } else {
2553                 flist_eof = 1;
2554                 if (DEBUG_GTE(FLIST, 3))
2555                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2556         }
2557
2558         return flist;
2559 }
2560
2561 struct file_list *recv_file_list(int f, int dir_ndx)
2562 {
2563         const char *good_dirname = NULL;
2564         struct file_list *flist;
2565         int dstart, flags;
2566         int64 start_read;
2567
2568         if (!first_flist) {
2569                 if (show_filelist_progress)
2570                         start_filelist_progress("receiving file list");
2571                 else if (inc_recurse && INFO_GTE(FLIST, 1) && !am_server)
2572                         rprintf(FCLIENT, "receiving incremental file list\n");
2573                 rprintf(FLOG, "receiving file list\n");
2574                 if (usermap)
2575                         parse_name_map(usermap, True);
2576                 if (groupmap)
2577                         parse_name_map(groupmap, False);
2578         }
2579
2580         start_read = stats.total_read;
2581
2582 #ifdef SUPPORT_HARD_LINKS
2583         if (preserve_hard_links && !first_flist)
2584                 init_hard_links();
2585 #endif
2586
2587         flist = flist_new(0, "recv_file_list");
2588         flist_expand(flist, FLIST_START_LARGE);
2589
2590         if (inc_recurse) {
2591                 if (flist->ndx_start == 1) {
2592                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
2593                         flist_expand(dir_flist, FLIST_START_LARGE);
2594                 }
2595                 dstart = dir_flist->used;
2596         } else {
2597                 dir_flist = flist;
2598                 dstart = 0;
2599         }
2600
2601         while (1) {
2602                 struct file_struct *file;
2603
2604                 if (xfer_flags_as_varint) {
2605                         if ((flags = read_varint(f)) == 0) {
2606                                 int err = read_varint(f);
2607                                 if (!ignore_errors)
2608                                         io_error |= err;
2609                                 break;
2610                         }
2611                 } else {
2612                         if ((flags = read_byte(f)) == 0)
2613                                 break;
2614
2615                         if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
2616                                 flags |= read_byte(f) << 8;
2617
2618                         if (flags == (XMIT_EXTENDED_FLAGS|XMIT_IO_ERROR_ENDLIST)) {
2619                                 int err;
2620                                 if (!use_safe_inc_flist) {
2621                                         rprintf(FERROR, "Invalid flist flag: %x\n", flags);
2622                                         exit_cleanup(RERR_PROTOCOL);
2623                                 }
2624                                 err = read_varint(f);
2625                                 if (!ignore_errors)
2626                                         io_error |= err;
2627                                 break;
2628                         }
2629                 }
2630
2631                 flist_expand(flist, 1);
2632                 file = recv_file_entry(f, flist, flags);
2633
2634                 if (inc_recurse) {
2635                         static const char empty_dir[] = "\0";
2636                         const char *cur_dir = file->dirname ? file->dirname : empty_dir;
2637                         if (relative_paths && *cur_dir == '/')
2638                                 cur_dir++;
2639                         if (cur_dir != good_dirname) {
2640                                 const char *d = dir_ndx >= 0 ? f_name(dir_flist->files[dir_ndx], NULL) : empty_dir;
2641                                 if (strcmp(cur_dir, d) != 0) {
2642                                         rprintf(FERROR,
2643                                                 "ABORTING due to invalid path from sender: %s/%s\n",
2644                                                 cur_dir, file->basename);
2645                                         exit_cleanup(RERR_UNSUPPORTED);
2646                                 }
2647                                 good_dirname = cur_dir;
2648                         }
2649                 }
2650
2651                 if (S_ISREG(file->mode)) {
2652                         /* Already counted */
2653                 } else if (S_ISDIR(file->mode)) {
2654                         if (inc_recurse) {
2655                                 flist_expand(dir_flist, 1);
2656                                 dir_flist->files[dir_flist->used++] = file;
2657                         }
2658                         stats.num_dirs++;
2659                 } else if (S_ISLNK(file->mode))
2660                         stats.num_symlinks++;
2661                 else if (IS_DEVICE(file->mode))
2662                         stats.num_devices++;
2663                 else
2664                         stats.num_specials++;
2665
2666                 flist->files[flist->used++] = file;
2667
2668                 maybe_emit_filelist_progress(flist->used);
2669
2670                 if (DEBUG_GTE(FLIST, 2)) {
2671                         char *name = f_name(file, NULL);
2672                         rprintf(FINFO, "recv_file_name(%s)\n", NS(name));
2673                 }
2674         }
2675         file_total += flist->used;
2676
2677         if (DEBUG_GTE(FLIST, 2))
2678                 rprintf(FINFO, "received %d names\n", flist->used);
2679
2680         if (show_filelist_progress)
2681                 finish_filelist_progress(flist);
2682
2683         if (need_unsorted_flist) {
2684                 /* Create an extra array of index pointers that we can sort for
2685                  * the generator's use (for wading through the files in sorted
2686                  * order and for calling flist_find()).  We keep the "files"
2687                  * list unsorted for our exchange of index numbers with the
2688                  * other side (since their names may not sort the same). */
2689                 flist->sorted = new_array(struct file_struct *, flist->used);
2690                 memcpy(flist->sorted, flist->files, flist->used * PTR_SIZE);
2691                 if (inc_recurse && dir_flist->used > dstart) {
2692                         static int dir_flist_malloced = 0;
2693                         if (dir_flist_malloced < dir_flist->malloced) {
2694                                 dir_flist->sorted = realloc_array(dir_flist->sorted,
2695                                                         struct file_struct *,
2696                                                         dir_flist->malloced);
2697                                 dir_flist_malloced = dir_flist->malloced;
2698                         }
2699                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2700                                (dir_flist->used - dstart) * PTR_SIZE);
2701                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2702                 }
2703         } else {
2704                 flist->sorted = flist->files;
2705                 if (inc_recurse && dir_flist->used > dstart) {
2706                         dir_flist->sorted = dir_flist->files;
2707                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2708                 }
2709         }
2710
2711         if (inc_recurse)
2712                 flist_done_allocating(flist);
2713         else if (f >= 0) {
2714                 recv_id_list(f, flist);
2715                 flist_eof = 1;
2716                 if (DEBUG_GTE(FLIST, 3))
2717                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2718         }
2719
2720         /* The --relative option sends paths with a leading slash, so we need
2721          * to specify the strip_root option here.  We rejected leading slashes
2722          * for a non-relative transfer in recv_file_entry(). */
2723         flist_sort_and_clean(flist, relative_paths);
2724
2725         if (protocol_version < 30) {
2726                 /* Recv the io_error flag */
2727                 int err = read_int(f);
2728                 if (!ignore_errors)
2729                         io_error |= err;
2730         } else if (inc_recurse && flist->ndx_start == 1) {
2731                 if (!file_total || strcmp(flist->sorted[flist->low]->basename, ".") != 0)
2732                         flist->parent_ndx = -1;
2733         }
2734
2735         if (DEBUG_GTE(FLIST, 3))
2736                 output_flist(flist);
2737
2738         if (DEBUG_GTE(FLIST, 2))
2739                 rprintf(FINFO, "recv_file_list done\n");
2740
2741         stats.flist_size += stats.total_read - start_read;
2742         stats.num_files += flist->used;
2743
2744         return flist;
2745 }
2746
2747 /* This is only used once by the receiver if the very first file-list
2748  * has exactly one item in it. */
2749 void recv_additional_file_list(int f)
2750 {
2751         struct file_list *flist;
2752         int ndx = read_ndx(f);
2753         if (ndx == NDX_FLIST_EOF) {
2754                 flist_eof = 1;
2755                 if (DEBUG_GTE(FLIST, 3))
2756                         rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
2757                 change_local_filter_dir(NULL, 0, 0);
2758         } else {
2759                 ndx = NDX_FLIST_OFFSET - ndx;
2760                 if (ndx < 0 || ndx >= dir_flist->used) {
2761                         ndx = NDX_FLIST_OFFSET - ndx;
2762                         rprintf(FERROR,
2763                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2764                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2765                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2766                         exit_cleanup(RERR_PROTOCOL);
2767                 }
2768                 if (DEBUG_GTE(FLIST, 3)) {
2769                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2770                                 who_am_i(), ndx);
2771                 }
2772                 flist = recv_file_list(f, ndx);
2773                 flist->parent_ndx = ndx;
2774         }
2775 }
2776
2777 /* Search for an identically-named item in the file list.  Note that the
2778  * items must agree in their directory-ness, or no match is returned. */
2779 int flist_find(struct file_list *flist, struct file_struct *f)
2780 {
2781         int low = flist->low, high = flist->high;
2782         int diff, mid, mid_up;
2783
2784         while (low <= high) {
2785                 mid = (low + high) / 2;
2786                 if (F_IS_ACTIVE(flist->sorted[mid]))
2787                         mid_up = mid;
2788                 else {
2789                         /* Scan for the next non-empty entry using the cached
2790                          * distance values.  If the value isn't fully up-to-
2791                          * date, update it. */
2792                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2793                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2794                                 do {
2795                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2796                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2797                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2798                         }
2799                         if (mid_up > high) {
2800                                 /* If there's nothing left above us, set high to
2801                                  * a non-empty entry below us and continue. */
2802                                 high = mid - (int)flist->sorted[mid]->len32;
2803                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2804                                         do {
2805                                             high -= (int)flist->sorted[high]->len32;
2806                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2807                                         flist->sorted[mid]->len32 = mid - high;
2808                                 }
2809                                 continue;
2810                         }
2811                 }
2812                 diff = f_name_cmp(flist->sorted[mid_up], f);
2813                 if (diff == 0) {
2814                         if (protocol_version < 29
2815                             && S_ISDIR(flist->sorted[mid_up]->mode)
2816                             != S_ISDIR(f->mode))
2817                                 return -1;
2818                         return mid_up;
2819                 }
2820                 if (diff < 0)
2821                         low = mid_up + 1;
2822                 else
2823                         high = mid - 1;
2824         }
2825         return -1;
2826 }
2827
2828 /* Search for a name in the file list.  You must specify want_dir_match as:
2829  * 1=match directories, 0=match non-directories, or -1=match either. */
2830 int flist_find_name(struct file_list *flist, const char *fname, int want_dir_match)
2831 {
2832         static struct file_struct *f;
2833         char fbuf[MAXPATHLEN];
2834         const char *slash = strrchr(fname, '/');
2835         const char *basename = slash ? slash+1 : fname;
2836
2837         if (!f)
2838                 f = (struct file_struct*)new_array(char, FILE_STRUCT_LEN + MAXPATHLEN + 1);
2839
2840         memset(f, 0, FILE_STRUCT_LEN);
2841         memcpy((void*)f->basename, basename, strlen(basename)+1);
2842
2843         if (slash) {
2844                 strlcpy(fbuf, fname, slash - fname + 1);
2845                 f->dirname = fbuf;
2846         } else
2847                 f->dirname = NULL;
2848
2849         f->mode = want_dir_match > 0 ? S_IFDIR : S_IFREG;
2850
2851         if (want_dir_match < 0)
2852                 return flist_find_ignore_dirness(flist, f);
2853         return flist_find(flist, f);
2854 }
2855
2856 /* Search for an identically-named item in the file list.  Differs from
2857  * flist_find in that an item that agrees with "f" in directory-ness is
2858  * preferred but one that does not is still found. */
2859 int flist_find_ignore_dirness(struct file_list *flist, struct file_struct *f)
2860 {
2861         mode_t save_mode;
2862         int ndx;
2863
2864         /* First look for an item that agrees in directory-ness. */
2865         ndx = flist_find(flist, f);
2866         if (ndx >= 0)
2867                 return ndx;
2868
2869         /* Temporarily flip f->mode to look for an item of opposite
2870          * directory-ness. */
2871         save_mode = f->mode;
2872         f->mode = S_ISDIR(f->mode) ? S_IFREG : S_IFDIR;
2873         ndx = flist_find(flist, f);
2874         f->mode = save_mode;
2875         return ndx;
2876 }
2877
2878 /*
2879  * Free up any resources a file_struct has allocated
2880  * and clear the file.
2881  */
2882 void clear_file(struct file_struct *file)
2883 {
2884         /* The +1 zeros out the first char of the basename. */
2885         memset(file, 0, FILE_STRUCT_LEN + 1);
2886         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2887          * entry.  Likewise for len32 in the opposite direction.  We assume
2888          * that we're alone for now since flist_find() will adjust the counts
2889          * it runs into that aren't up-to-date. */
2890         file->len32 = F_DEPTH(file) = 1;
2891 }
2892
2893 /* Allocate a new file list. */
2894 static struct file_list *flist_new(int flags, const char *msg)
2895 {
2896         struct file_list *flist;
2897
2898         flist = new0(struct file_list);
2899
2900         if (flags & FLIST_TEMP) {
2901                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0, _out_of_memory, POOL_INTERN)))
2902                         out_of_memory(msg);
2903         } else {
2904                 /* This is a doubly linked list with prev looping back to
2905                  * the end of the list, but the last next pointer is NULL. */
2906                 if (!first_flist) {
2907                         if (!(flist->file_pool = pool_create(NORMAL_EXTENT, 0, _out_of_memory, POOL_INTERN)))
2908                                 out_of_memory(msg);
2909
2910                         flist->ndx_start = flist->flist_num = inc_recurse ? 1 : 0;
2911
2912                         first_flist = cur_flist = flist->prev = flist;
2913                 } else {
2914                         struct file_list *prev = first_flist->prev;
2915
2916                         flist->file_pool = first_flist->file_pool;
2917
2918                         flist->ndx_start = prev->ndx_start + prev->used + 1;
2919                         flist->flist_num = prev->flist_num + 1;
2920
2921                         flist->prev = prev;
2922                         prev->next = first_flist->prev = flist;
2923                 }
2924                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2925                 flist_cnt++;
2926         }
2927
2928         return flist;
2929 }
2930
2931 /* Free up all elements in a flist. */
2932 void flist_free(struct file_list *flist)
2933 {
2934         if (!flist->prev) {
2935                 /* Was FLIST_TEMP dir-list. */
2936         } else if (flist == flist->prev) {
2937                 first_flist = cur_flist = NULL;
2938                 file_total = 0;
2939                 flist_cnt = 0;
2940         } else {
2941                 if (flist == cur_flist)
2942                         cur_flist = flist->next;
2943                 if (flist == first_flist)
2944                         first_flist = first_flist->next;
2945                 else {
2946                         flist->prev->next = flist->next;
2947                         if (!flist->next)
2948                                 flist->next = first_flist;
2949                 }
2950                 flist->next->prev = flist->prev;
2951                 file_total -= flist->used;
2952                 flist_cnt--;
2953         }
2954
2955         if (!flist->prev || !flist_cnt)
2956                 pool_destroy(flist->file_pool);
2957         else
2958                 pool_free_old(flist->file_pool, flist->pool_boundary);
2959
2960         if (flist->sorted && flist->sorted != flist->files)
2961                 free(flist->sorted);
2962         free(flist->files);
2963         free(flist);
2964 }
2965
2966 /* This routine ensures we don't have any duplicate names in our file list.
2967  * duplicate names can cause corruption because of the pipelining. */
2968 static void flist_sort_and_clean(struct file_list *flist, int strip_root)
2969 {
2970         char fbuf[MAXPATHLEN];
2971         int i, prev_i;
2972
2973         if (!flist)
2974                 return;
2975         if (flist->used == 0) {
2976                 flist->high = -1;
2977                 flist->low = 0;
2978                 return;
2979         }
2980
2981         fsort(flist->sorted, flist->used);
2982
2983         if (!am_sender || inc_recurse) {
2984                 for (i = prev_i = 0; i < flist->used; i++) {
2985                         if (F_IS_ACTIVE(flist->sorted[i])) {
2986                                 prev_i = i;
2987                                 break;
2988                         }
2989                 }
2990                 flist->low = prev_i;
2991         } else {
2992                 i = prev_i = flist->used - 1;
2993                 flist->low = 0;
2994         }
2995
2996         while (++i < flist->used) {
2997                 int j;
2998                 struct file_struct *file = flist->sorted[i];
2999
3000                 if (!F_IS_ACTIVE(file))
3001                         continue;
3002                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
3003                         j = prev_i;
3004                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
3005                         int save_mode = file->mode;
3006                         /* Make sure that this directory doesn't duplicate a
3007                          * non-directory earlier in the list. */
3008                         flist->high = prev_i;
3009                         file->mode = S_IFREG;
3010                         j = flist_find(flist, file);
3011                         file->mode = save_mode;
3012                 } else
3013                         j = -1;
3014                 if (j >= 0) {
3015                         int keep, drop;
3016                         /* If one is a dir and the other is not, we want to
3017                          * keep the dir because it might have contents in the
3018                          * list.  Otherwise keep the first one. */
3019                         if (S_ISDIR(file->mode)) {
3020                                 struct file_struct *fp = flist->sorted[j];
3021                                 if (!S_ISDIR(fp->mode))
3022                                         keep = i, drop = j;
3023                                 else {
3024                                         if (am_sender)
3025                                                 file->flags |= FLAG_DUPLICATE;
3026                                         else { /* Make sure we merge our vital flags. */
3027                                                 fp->flags |= file->flags & (FLAG_TOP_DIR|FLAG_CONTENT_DIR);
3028                                                 fp->flags &= file->flags | ~FLAG_IMPLIED_DIR;
3029                                         }
3030                                         keep = j, drop = i;
3031                                 }
3032                         } else
3033                                 keep = j, drop = i;
3034
3035                         if (!am_sender) {
3036                                 if (DEBUG_GTE(DUP, 1)) {
3037                                         rprintf(FINFO,
3038                                             "removing duplicate name %s from file list (%d)\n",
3039                                             f_name(file, fbuf), drop + flist->ndx_start);
3040                                 }
3041                                 clear_file(flist->sorted[drop]);
3042                         }
3043
3044                         if (keep == i) {
3045                                 if (flist->low == drop) {
3046                                         for (j = drop + 1;
3047                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
3048                                              j++) {}
3049                                         flist->low = j;
3050                                 }
3051                                 prev_i = i;
3052                         }
3053                 } else
3054                         prev_i = i;
3055         }
3056         flist->high = prev_i;
3057
3058         if (strip_root) {
3059                 /* We need to strip off the leading slashes for relative
3060                  * paths, but this must be done _after_ the sorting phase. */
3061                 for (i = flist->low; i <= flist->high; i++) {
3062                         struct file_struct *file = flist->sorted[i];
3063
3064                         if (!file->dirname)
3065                                 continue;
3066                         while (*file->dirname == '/')
3067                                 file->dirname++;
3068                         if (!*file->dirname)
3069                                 file->dirname = NULL;
3070                 }
3071         }
3072
3073         if (prune_empty_dirs && !am_sender) {
3074                 int j, prev_depth = 0;
3075
3076                 prev_i = 0; /* It's OK that this isn't really true. */
3077
3078                 for (i = flist->low; i <= flist->high; i++) {
3079                         struct file_struct *fp, *file = flist->sorted[i];
3080
3081                         /* This temporarily abuses the F_DEPTH() value for a
3082                          * directory that is in a chain that might get pruned.
3083                          * We restore the old value if it gets a reprieve. */
3084                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
3085                                 /* Dump empty dirs when coming back down. */
3086                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
3087                                         fp = flist->sorted[prev_i];
3088                                         if (F_DEPTH(fp) >= 0)
3089                                                 break;
3090                                         prev_i = -F_DEPTH(fp)-1;
3091                                         clear_file(fp);
3092                                 }
3093                                 prev_depth = F_DEPTH(file);
3094                                 if (is_excluded(f_name(file, fbuf), 1, ALL_FILTERS)) {
3095                                         /* Keep dirs through this dir. */
3096                                         for (j = prev_depth-1; ; j--) {
3097                                                 fp = flist->sorted[prev_i];
3098                                                 if (F_DEPTH(fp) >= 0)
3099                                                         break;
3100                                                 prev_i = -F_DEPTH(fp)-1;
3101                                                 F_DEPTH(fp) = j;
3102                                         }
3103                                 } else
3104                                         F_DEPTH(file) = -prev_i-1;
3105                                 prev_i = i;
3106                         } else {
3107                                 /* Keep dirs through this non-dir. */
3108                                 for (j = prev_depth; ; j--) {
3109                                         fp = flist->sorted[prev_i];
3110                                         if (F_DEPTH(fp) >= 0)
3111                                                 break;
3112                                         prev_i = -F_DEPTH(fp)-1;
3113                                         F_DEPTH(fp) = j;
3114                                 }
3115                         }
3116                 }
3117                 /* Dump all remaining empty dirs. */
3118                 while (1) {
3119                         struct file_struct *fp = flist->sorted[prev_i];
3120                         if (F_DEPTH(fp) >= 0)
3121                                 break;
3122                         prev_i = -F_DEPTH(fp)-1;
3123                         clear_file(fp);
3124                 }
3125
3126                 for (i = flist->low; i <= flist->high; i++) {
3127                         if (F_IS_ACTIVE(flist->sorted[i]))
3128                                 break;
3129                 }
3130                 flist->low = i;
3131                 for (i = flist->high; i >= flist->low; i--) {
3132                         if (F_IS_ACTIVE(flist->sorted[i]))
3133                                 break;
3134                 }
3135                 flist->high = i;
3136         }
3137 }
3138
3139 static void output_flist(struct file_list *flist)
3140 {
3141         char uidbuf[16], gidbuf[16], depthbuf[16];
3142         struct file_struct *file;
3143         const char *root, *dir, *slash, *name, *trail;
3144         const char *who = who_am_i();
3145         int i;
3146
3147         rprintf(FINFO, "[%s] flist start=%d, used=%d, low=%d, high=%d\n",
3148                 who, flist->ndx_start, flist->used, flist->low, flist->high);
3149         for (i = 0; i < flist->used; i++) {
3150                 file = flist->files[i];
3151                 if ((am_root || am_sender) && uid_ndx) {
3152                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
3153                                  F_OWNER(file));
3154                 } else
3155                         *uidbuf = '\0';
3156                 if (gid_ndx) {
3157                         static char parens[] = "(\0)\0\0\0";
3158                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
3159                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
3160                                  pp, F_GROUP(file), pp + 2);
3161                 } else
3162                         *gidbuf = '\0';
3163                 if (!am_sender)
3164                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
3165                 if (F_IS_ACTIVE(file)) {
3166                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
3167                         if ((dir = file->dirname) == NULL)
3168                                 dir = slash = "";
3169                         else
3170                                 slash = "/";
3171                         name = file->basename;
3172                         trail = S_ISDIR(file->mode) ? "/" : "";
3173                 } else
3174                         root = dir = slash = name = trail = "";
3175                 rprintf(FINFO,
3176                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%s%s%s flags=%x\n",
3177                         who, i + flist->ndx_start,
3178                         root, dir, slash, name, trail,
3179                         (int)file->mode, comma_num(F_LENGTH(file)),
3180                         uidbuf, gidbuf, file->flags);
3181         }
3182 }
3183
3184 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
3185 enum fnc_type { t_PATH, t_ITEM };
3186
3187 static int found_prefix;
3188
3189 /* Compare the names of two file_struct entities, similar to how strcmp()
3190  * would do if it were operating on the joined strings.
3191  *
3192  * Some differences beginning with protocol_version 29: (1) directory names
3193  * are compared with an assumed trailing slash so that they compare in a
3194  * way that would cause them to sort immediately prior to any content they
3195  * may have; (2) a directory of any name compares after a non-directory of
3196  * any name at the same depth; (3) a directory with name "." compares prior
3197  * to anything else.  These changes mean that a directory and a non-dir
3198  * with the same name will not compare as equal (protocol_version >= 29).
3199  *
3200  * The dirname component can be an empty string, but the basename component
3201  * cannot (and never is in the current codebase).  The basename component
3202  * may be NULL (for a removed item), in which case it is considered to be
3203  * after any existing item. */
3204 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
3205 {
3206         int dif;
3207         const uchar *c1, *c2;
3208         enum fnc_state state1, state2;
3209         enum fnc_type type1, type2;
3210         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
3211
3212         if (!f1 || !F_IS_ACTIVE(f1)) {
3213                 if (!f2 || !F_IS_ACTIVE(f2))
3214                         return 0;
3215                 return -1;
3216         }
3217         if (!f2 || !F_IS_ACTIVE(f2))
3218                 return 1;
3219
3220         c1 = (uchar*)f1->dirname;
3221         c2 = (uchar*)f2->dirname;
3222         if (c1 == c2)
3223                 c1 = c2 = NULL;
3224         if (!c1) {
3225                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3226                 c1 = (const uchar*)f1->basename;
3227                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3228                         type1 = t_ITEM;
3229                         state1 = s_TRAILING;
3230                         c1 = (uchar*)"";
3231                 } else
3232                         state1 = s_BASE;
3233         } else {
3234                 type1 = t_path;
3235                 state1 = s_DIR;
3236         }
3237         if (!c2) {
3238                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3239                 c2 = (const uchar*)f2->basename;
3240                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3241                         type2 = t_ITEM;
3242                         state2 = s_TRAILING;
3243                         c2 = (uchar*)"";
3244                 } else
3245                         state2 = s_BASE;
3246         } else {
3247                 type2 = t_path;
3248                 state2 = s_DIR;
3249         }
3250
3251         if (type1 != type2)
3252                 return type1 == t_PATH ? 1 : -1;
3253
3254         do {
3255                 if (!*c1) {
3256                         switch (state1) {
3257                         case s_DIR:
3258                                 state1 = s_SLASH;
3259                                 c1 = (uchar*)"/";
3260                                 break;
3261                         case s_SLASH:
3262                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
3263                                 c1 = (const uchar*)f1->basename;
3264                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
3265                                         type1 = t_ITEM;
3266                                         state1 = s_TRAILING;
3267                                         c1 = (uchar*)"";
3268                                 } else
3269                                         state1 = s_BASE;
3270                                 break;
3271                         case s_BASE:
3272                                 state1 = s_TRAILING;
3273                                 if (type1 == t_PATH) {
3274                                         c1 = (uchar*)"/";
3275                                         break;
3276                                 }
3277                                 /* FALL THROUGH */
3278                         case s_TRAILING:
3279                                 type1 = t_ITEM;
3280                                 break;
3281                         }
3282                         if (*c2 && type1 != type2)
3283                                 return type1 == t_PATH ? 1 : -1;
3284                 }
3285                 if (!*c2) {
3286                         switch (state2) {
3287                         case s_DIR:
3288                                 state2 = s_SLASH;
3289                                 c2 = (uchar*)"/";
3290                                 break;
3291                         case s_SLASH:
3292                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
3293                                 c2 = (const uchar*)f2->basename;
3294                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
3295                                         type2 = t_ITEM;
3296                                         state2 = s_TRAILING;
3297                                         c2 = (uchar*)"";
3298                                 } else
3299                                         state2 = s_BASE;
3300                                 break;
3301                         case s_BASE:
3302                                 state2 = s_TRAILING;
3303                                 if (type2 == t_PATH) {
3304                                         c2 = (uchar*)"/";
3305                                         break;
3306                                 }
3307                                 /* FALL THROUGH */
3308                         case s_TRAILING:
3309                                 found_prefix = 1;
3310                                 if (!*c1)
3311                                         return 0;
3312                                 type2 = t_ITEM;
3313                                 break;
3314                         }
3315                         if (type1 != type2)
3316                                 return type1 == t_PATH ? 1 : -1;
3317                 }
3318         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
3319
3320         return dif;
3321 }
3322
3323 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
3324  * not match if f2's basename is not an exact match of a path element in f1.
3325  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
3326 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
3327 {
3328         found_prefix = 0;
3329         f_name_cmp(f1, f2);
3330         return found_prefix;
3331 }
3332
3333 char *f_name_buf(void)
3334 {
3335         static char names[5][MAXPATHLEN];
3336         static unsigned int n;
3337
3338         n = (n + 1) % (sizeof names / sizeof names[0]);
3339
3340         return names[n];
3341 }
3342
3343 /* Return a copy of the full filename of a flist entry, using the indicated
3344  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
3345  * done because we checked the size when creating the file_struct entry.
3346  */
3347 char *f_name(const struct file_struct *f, char *fbuf)
3348 {
3349         if (!f || !F_IS_ACTIVE(f))
3350                 return NULL;
3351
3352         if (!fbuf)
3353                 fbuf = f_name_buf();
3354
3355         if (f->dirname) {
3356                 int len = strlen(f->dirname);
3357                 memcpy(fbuf, f->dirname, len);
3358                 fbuf[len] = '/';
3359                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
3360         } else
3361                 strlcpy(fbuf, f->basename, MAXPATHLEN);
3362
3363         return fbuf;
3364 }
3365
3366 /* Do a non-recursive scan of the named directory, possibly ignoring all
3367  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
3368  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
3369  * buffer (the functions we call will append names onto the end, but the old
3370  * dir value will be restored on exit). */
3371 struct file_list *get_dirlist(char *dirname, int dlen, int flags)
3372 {
3373         struct file_list *dirlist;
3374         char dirbuf[MAXPATHLEN];
3375         int save_recurse = recurse;
3376         int save_xfer_dirs = xfer_dirs;
3377         int save_prune_empty_dirs = prune_empty_dirs;
3378         int senddir_fd = flags & GDL_IGNORE_FILTER_RULES ? -2 : -1;
3379         int senddir_flags = FLAG_CONTENT_DIR;
3380
3381         if (dlen < 0) {
3382                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
3383                 if (dlen >= MAXPATHLEN)
3384                         return NULL;
3385                 dirname = dirbuf;
3386         }
3387
3388         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
3389
3390         if (flags & GDL_PERHAPS_DIR)
3391                 senddir_flags |= FLAG_PERHAPS_DIR;
3392
3393         recurse = 0;
3394         xfer_dirs = 1;
3395         send_directory(senddir_fd, dirlist, dirname, dlen, senddir_flags);
3396         xfer_dirs = save_xfer_dirs;
3397         recurse = save_recurse;
3398         if (INFO_GTE(PROGRESS, 1))
3399                 flist_count_offset += dirlist->used;
3400
3401         prune_empty_dirs = 0;
3402         dirlist->sorted = dirlist->files;
3403         flist_sort_and_clean(dirlist, 0);
3404         prune_empty_dirs = save_prune_empty_dirs;
3405
3406         if (DEBUG_GTE(FLIST, 3))
3407                 output_flist(dirlist);
3408
3409         return dirlist;
3410 }