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, 2003, 2004, 2005, 2006, 2007 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 2 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, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  22  */
  23
  24 #include "rsync.h"
  25 #include "rounding.h"
  26
  27 extern int verbose;
  28 extern int list_only;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int inc_recurse;
  34 extern int do_progress;
  35 extern int always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38 extern int numeric_ids;
  39 extern int recurse;
  40 extern int xfer_dirs;
  41 extern int filesfrom_fd;
  42 extern int one_file_system;
  43 extern int copy_dirlinks;
  44 extern int keep_dirlinks;
  45 extern int preserve_links;
  46 extern int preserve_hard_links;
  47 extern int preserve_devices;
  48 extern int preserve_specials;
  49 extern int preserve_uid;
  50 extern int preserve_gid;
  51 extern int relative_paths;
  52 extern int implied_dirs;
  53 extern int file_extra_cnt;
  54 extern int ignore_perishable;
  55 extern int non_perishable_cnt;
  56 extern int prune_empty_dirs;
  57 extern int copy_links;
  58 extern int copy_unsafe_links;
  59 extern int protocol_version;
  60 extern int sanitize_paths;
  61 extern struct stats stats;
  62
  63 extern char curr_dir[MAXPATHLEN];
  64
  65 extern struct chmod_mode_struct *chmod_modes;
  66
  67 extern struct filter_list_struct filter_list;
  68 extern struct filter_list_struct server_filter_list;
  69
  70 int io_error;
  71 int checksum_len;
  72 dev_t filesystem_dev; /* used to implement -x */
  73
  74 struct file_list *cur_flist, *first_flist, *dir_flist;
  75 int send_dir_ndx = -1, send_dir_depth = 0;
  76 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  77 int file_total = 0; /* total of all active items over all file-lists */
  78 int flist_eof = 0; /* all the file-lists are now known */
  79
  80 /* The tmp_* vars are used as a cache area by make_file() to store data
  81  * that the sender doesn't need to remember in its file list.  The data
  82  * will survive just long enough to be used by send_file_entry(). */
  83 static dev_t tmp_rdev;
  84 #ifdef SUPPORT_HARD_LINKS
  85 static int64 tmp_dev, tmp_ino;
  86 #endif
  87 static char tmp_sum[MD4_SUM_LENGTH];
  88
  89 static char empty_sum[MD4_SUM_LENGTH];
  90 static int flist_count_offset; /* for --delete --progress */
  91
  92 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  93 static void output_flist(struct file_list *flist);
  94
  95 void init_flist(void)
  96 {
  97         if (verbose > 4) {
  98                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
  99                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 100         }
 101         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
 102 }
 103
 104 static int show_filelist_p(void)
 105 {
 106         return verbose && xfer_dirs && !am_server && !inc_recurse;
 107 }
 108
 109 static void start_filelist_progress(char *kind)
 110 {
 111         rprintf(FCLIENT, "%s ... ", kind);
 112         if (verbose > 1 || do_progress)
 113                 rprintf(FCLIENT, "\n");
 114         rflush(FINFO);
 115 }
 116
 117 static void emit_filelist_progress(int count)
 118 {
 119         rprintf(FCLIENT, " %d files...\r", count);
 120 }
 121
 122 static void maybe_emit_filelist_progress(int count)
 123 {
 124         if (do_progress && show_filelist_p() && (count % 100) == 0)
 125                 emit_filelist_progress(count);
 126 }
 127
 128 static void finish_filelist_progress(const struct file_list *flist)
 129 {
 130         if (do_progress) {
 131                 /* This overwrites the progress line */
 132                 rprintf(FINFO, "%d file%sto consider\n",
 133                         flist->count, flist->count == 1 ? " " : "s ");
 134         } else
 135                 rprintf(FINFO, "done\n");
 136 }
 137
 138 void show_flist_stats(void)
 139 {
 140         /* Nothing yet */
 141 }
 142
 143 static void list_file_entry(struct file_struct *f)
 144 {
 145         char permbuf[PERMSTRING_SIZE];
 146         double len;
 147
 148         if (!F_IS_ACTIVE(f)) {
 149                 /* this can happen if duplicate names were removed */
 150                 return;
 151         }
 152
 153         permstring(permbuf, f->mode);
 154         len = F_LENGTH(f);
 155
 156 #ifdef SUPPORT_LINKS
 157         if (preserve_links && S_ISLNK(f->mode)) {
 158                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 159                         permbuf, len, timestring(f->modtime),
 160                         f_name(f, NULL), F_SYMLINK(f));
 161         } else
 162 #endif
 163         {
 164                 rprintf(FINFO, "%s %11.0f %s %s\n",
 165                         permbuf, len, timestring(f->modtime),
 166                         f_name(f, NULL));
 167         }
 168 }
 169
 170 /* Stat either a symlink or its referent, depending on the settings of
 171  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 172  *
 173  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 174  * MAXPATHLEN chars) will be set to the symlink's target string.
 175  *
 176  * The stat structure pointed to by stp will contain information about the
 177  * link or the referent as appropriate, if they exist. */
 178 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 179 {
 180 #ifdef SUPPORT_LINKS
 181         if (link_stat(path, stp, copy_dirlinks) < 0)
 182                 return -1;
 183         if (S_ISLNK(stp->st_mode)) {
 184                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 185                 if (llen < 0)
 186                         return -1;
 187                 linkbuf[llen] = '\0';
 188                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 189                         if (verbose > 1) {
 190                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 191                                         path, linkbuf);
 192                         }
 193                         return do_stat(path, stp);
 194                 }
 195         }
 196         return 0;
 197 #else
 198         return do_stat(path, stp);
 199 #endif
 200 }
 201
 202 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 203 {
 204 #ifdef SUPPORT_LINKS
 205         if (copy_links)
 206                 return do_stat(path, stp);
 207         if (do_lstat(path, stp) < 0)
 208                 return -1;
 209         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 210                 STRUCT_STAT st;
 211                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 212                         *stp = st;
 213         }
 214         return 0;
 215 #else
 216         return do_stat(path, stp);
 217 #endif
 218 }
 219
 220 /* This function is used to check if a file should be included/excluded
 221  * from the list of files based on its name and type etc.  The value of
 222  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 223 static int is_excluded(char *fname, int is_dir, int filter_level)
 224 {
 225 #if 0 /* This currently never happens, so avoid a useless compare. */
 226         if (filter_level == NO_FILTERS)
 227                 return 0;
 228 #endif
 229         if (fname) {
 230                 /* never exclude '.', even if somebody does --exclude '*' */
 231                 if (fname[0] == '.' && !fname[1])
 232                         return 0;
 233                 /* Handle the -R version of the '.' dir. */
 234                 if (fname[0] == '/') {
 235                         int len = strlen(fname);
 236                         if (fname[len-1] == '.' && fname[len-2] == '/')
 237                                 return 0;
 238                 }
 239         }
 240         if (server_filter_list.head
 241             && check_filter(&server_filter_list, fname, is_dir) < 0)
 242                 return 1;
 243         if (filter_level != ALL_FILTERS)
 244                 return 0;
 245         if (filter_list.head
 246             && check_filter(&filter_list, fname, is_dir) < 0)
 247                 return 1;
 248         return 0;
 249 }
 250
 251 static int to_wire_mode(mode_t mode)
 252 {
 253 #ifdef SUPPORT_LINKS
 254 #if _S_IFLNK != 0120000
 255         if (S_ISLNK(mode))
 256                 return (mode & ~(_S_IFMT)) | 0120000;
 257 #endif
 258 #endif
 259         return mode;
 260 }
 261
 262 static mode_t from_wire_mode(int mode)
 263 {
 264 #if _S_IFLNK != 0120000
 265         if ((mode & (_S_IFMT)) == 0120000)
 266                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 267 #endif
 268         return mode;
 269 }
 270
 271 static void send_directory(int f, struct file_list *flist, int ndx,
 272                            char *fbuf, int len, int flags);
 273
 274 static const char *flist_dir, *orig_dir;
 275 static int flist_dir_len;
 276
 277
 278 /**
 279  * Make sure @p flist is big enough to hold at least @p flist->count
 280  * entries.
 281  **/
 282 void flist_expand(struct file_list *flist)
 283 {
 284         struct file_struct **new_ptr;
 285
 286         if (flist->count < flist->malloced)
 287                 return;
 288
 289         if (flist->malloced < FLIST_START)
 290                 flist->malloced = FLIST_START;
 291         else if (flist->malloced >= FLIST_LINEAR)
 292                 flist->malloced += FLIST_LINEAR;
 293         else
 294                 flist->malloced *= 2;
 295
 296         /*
 297          * In case count jumped or we are starting the list
 298          * with a known size just set it.
 299          */
 300         if (flist->malloced < flist->count)
 301                 flist->malloced = flist->count;
 302
 303         new_ptr = realloc_array(flist->files, struct file_struct *,
 304                                 flist->malloced);
 305
 306         if (verbose >= 2 && flist->malloced != FLIST_START) {
 307                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
 308                     who_am_i(),
 309                     (double)sizeof flist->files[0] * flist->malloced,
 310                     (new_ptr == flist->files) ? " not" : "");
 311         }
 312
 313         flist->files = new_ptr;
 314
 315         if (!flist->files)
 316                 out_of_memory("flist_expand");
 317 }
 318
 319 int push_flist_dir(const char *dir, int len)
 320 {
 321         if (dir == flist_dir)
 322                 return 1;
 323
 324         if (!orig_dir)
 325                 orig_dir = strdup(curr_dir);
 326
 327         if (flist_dir && !pop_dir(orig_dir)) {
 328                 rsyserr(FERROR, errno, "pop_dir %s failed",
 329                         full_fname(orig_dir));
 330                 exit_cleanup(RERR_FILESELECT);
 331         }
 332
 333         if (dir && !push_dir(dir, 0)) {
 334                 io_error |= IOERR_GENERAL;
 335                 rsyserr(FERROR, errno, "push_dir %s failed",
 336                         full_fname(dir));
 337                 return 0;
 338         }
 339
 340         flist_dir = dir;
 341         flist_dir_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 342
 343         return 1;
 344 }
 345
 346 static void send_file_entry(int f, struct file_struct *file, int ndx)
 347 {
 348         static time_t modtime;
 349         static mode_t mode;
 350         static int64 dev;
 351         static dev_t rdev;
 352         static uint32 rdev_major;
 353         static uid_t uid;
 354         static gid_t gid;
 355         static char *user_name, *group_name;
 356         static char lastname[MAXPATHLEN];
 357         char fname[MAXPATHLEN];
 358         int first_hlink_ndx = -1;
 359         int l1, l2;
 360         int flags;
 361
 362         f_name(file, fname);
 363
 364         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 365
 366         if (file->mode == mode)
 367                 flags |= XMIT_SAME_MODE;
 368         else
 369                 mode = file->mode;
 370         if ((preserve_devices && IS_DEVICE(mode))
 371          || (preserve_specials && IS_SPECIAL(mode))) {
 372                 if (protocol_version < 28) {
 373                         if (tmp_rdev == rdev)
 374                                 flags |= XMIT_SAME_RDEV_pre28;
 375                         else
 376                                 rdev = tmp_rdev;
 377                 } else {
 378                         rdev = tmp_rdev;
 379                         if ((uint32)major(rdev) == rdev_major)
 380                                 flags |= XMIT_SAME_RDEV_MAJOR;
 381                         else
 382                                 rdev_major = major(rdev);
 383                         if ((uint32)minor(rdev) <= 0xFFu)
 384                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 385                 }
 386         } else if (protocol_version < 28)
 387                 rdev = MAKEDEV(0, 0);
 388         if (preserve_uid) {
 389                 if (F_UID(file) == uid && *lastname)
 390                         flags |= XMIT_SAME_UID;
 391                 else {
 392                         uid = F_UID(file);
 393                         if (preserve_uid && !numeric_ids) {
 394                                 user_name = add_uid(uid);
 395                                 if (inc_recurse && user_name)
 396                                         flags |= XMIT_USER_NAME_FOLLOWS;
 397                         }
 398                 }
 399         }
 400         if (preserve_gid) {
 401                 if (F_GID(file) == gid && *lastname)
 402                         flags |= XMIT_SAME_GID;
 403                 else {
 404                         gid = F_GID(file);
 405                         if (preserve_gid && !numeric_ids) {
 406                                 group_name = add_gid(gid);
 407                                 if (inc_recurse && group_name)
 408                                         flags |= XMIT_GROUP_NAME_FOLLOWS;
 409                         }
 410                 }
 411         }
 412         if (file->modtime == modtime)
 413                 flags |= XMIT_SAME_TIME;
 414         else
 415                 modtime = file->modtime;
 416
 417 #ifdef SUPPORT_HARD_LINKS
 418         if (tmp_dev != 0) {
 419                 if (protocol_version >= 30) {
 420                         struct idev_node *np = idev_node(tmp_dev, tmp_ino);
 421                         first_hlink_ndx = (int32)(long)np->data - 1;
 422                         if (first_hlink_ndx < 0) {
 423                                 np->data = (void*)(long)(ndx + 1);
 424                                 flags |= XMIT_HLINK_FIRST;
 425                         }
 426                         flags |= XMIT_HLINKED;
 427                 } else {
 428                         if (tmp_dev == dev) {
 429                                 if (protocol_version >= 28)
 430                                         flags |= XMIT_SAME_DEV_pre30;
 431                         } else
 432                                 dev = tmp_dev;
 433                         flags |= XMIT_HLINKED;
 434                 }
 435         }
 436 #endif
 437
 438         for (l1 = 0;
 439             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 440             l1++) {}
 441         l2 = strlen(fname+l1);
 442
 443         if (l1 > 0)
 444                 flags |= XMIT_SAME_NAME;
 445         if (l2 > 255)
 446                 flags |= XMIT_LONG_NAME;
 447
 448         /* We must make sure we don't send a zero flag byte or the
 449          * other end will terminate the flist transfer.  Note that
 450          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 451          * it's harmless way to add a bit to the first flag byte. */
 452         if (protocol_version >= 28) {
 453                 if (!flags && !S_ISDIR(mode))
 454                         flags |= XMIT_TOP_DIR;
 455                 if ((flags & 0xFF00) || !flags) {
 456                         flags |= XMIT_EXTENDED_FLAGS;
 457                         write_shortint(f, flags);
 458                 } else
 459                         write_byte(f, flags);
 460         } else {
 461                 if (!(flags & 0xFF))
 462                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 463                 write_byte(f, flags);
 464         }
 465         if (flags & XMIT_SAME_NAME)
 466                 write_byte(f, l1);
 467         if (flags & XMIT_LONG_NAME)
 468                 write_int(f, l2);
 469         else
 470                 write_byte(f, l2);
 471         write_buf(f, fname + l1, l2);
 472
 473         if (first_hlink_ndx >= 0) {
 474                 write_int(f, first_hlink_ndx);
 475                 goto the_end;
 476         }
 477
 478         write_longint(f, F_LENGTH(file));
 479         if (!(flags & XMIT_SAME_TIME))
 480                 write_int(f, modtime);
 481         if (!(flags & XMIT_SAME_MODE))
 482                 write_int(f, to_wire_mode(mode));
 483         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 484                 write_int(f, uid);
 485                 if (flags & XMIT_USER_NAME_FOLLOWS) {
 486                         int len = strlen(user_name);
 487                         write_byte(f, len);
 488                         write_buf(f, user_name, len);
 489                 }
 490         }
 491         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 492                 write_int(f, gid);
 493                 if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 494                         int len = strlen(group_name);
 495                         write_byte(f, len);
 496                         write_buf(f, group_name, len);
 497                 }
 498         }
 499         if ((preserve_devices && IS_DEVICE(mode))
 500          || (preserve_specials && IS_SPECIAL(mode))) {
 501                 if (protocol_version < 28) {
 502                         if (!(flags & XMIT_SAME_RDEV_pre28))
 503                                 write_int(f, (int)rdev);
 504                 } else {
 505                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 506                                 write_int(f, major(rdev));
 507                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 508                                 write_byte(f, minor(rdev));
 509                         else
 510                                 write_int(f, minor(rdev));
 511                 }
 512         }
 513
 514 #ifdef SUPPORT_LINKS
 515         if (preserve_links && S_ISLNK(mode)) {
 516                 const char *sl = F_SYMLINK(file);
 517                 int len = strlen(sl);
 518                 write_int(f, len);
 519                 write_buf(f, sl, len);
 520         }
 521 #endif
 522
 523 #ifdef SUPPORT_HARD_LINKS
 524         if (tmp_dev != 0 && protocol_version < 30) {
 525                 if (protocol_version < 26) {
 526                         /* 32-bit dev_t and ino_t */
 527                         write_int(f, (int32)dev);
 528                         write_int(f, (int32)tmp_ino);
 529                 } else {
 530                         /* 64-bit dev_t and ino_t */
 531                         if (!(flags & XMIT_SAME_DEV_pre30))
 532                                 write_longint(f, dev);
 533                         write_longint(f, tmp_ino);
 534                 }
 535         }
 536 #endif
 537
 538         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 539                 const char *sum;
 540                 if (S_ISREG(mode))
 541                         sum = tmp_sum;
 542                 else {
 543                         /* Prior to 28, we sent a useless set of nulls. */
 544                         sum = empty_sum;
 545                 }
 546                 write_buf(f, sum, checksum_len);
 547         }
 548
 549   the_end:
 550         strlcpy(lastname, fname, MAXPATHLEN);
 551
 552         if (S_ISREG(mode) || S_ISLNK(mode))
 553                 stats.total_size += F_LENGTH(file);
 554 }
 555
 556 static struct file_struct *recv_file_entry(struct file_list *flist,
 557                                            int flags, int f)
 558 {
 559         static time_t modtime;
 560         static mode_t mode;
 561         static int64 dev;
 562         static dev_t rdev;
 563         static uint32 rdev_major;
 564         static uid_t uid;
 565         static gid_t gid;
 566         static char lastname[MAXPATHLEN], *lastdir;
 567         static int lastdir_depth, lastdir_len = -1;
 568         static unsigned int del_hier_name_len = 0;
 569         static int in_del_hier = 0;
 570         char thisname[MAXPATHLEN];
 571         unsigned int l1 = 0, l2 = 0;
 572         int alloc_len, basename_len, linkname_len;
 573         int extra_len = file_extra_cnt * EXTRA_LEN;
 574         int first_hlink_ndx = -1;
 575         OFF_T file_length;
 576         const char *basename;
 577         char *bp;
 578         struct file_struct *file;
 579
 580         if (flags & XMIT_SAME_NAME)
 581                 l1 = read_byte(f);
 582
 583         if (flags & XMIT_LONG_NAME)
 584                 l2 = read_int(f);
 585         else
 586                 l2 = read_byte(f);
 587
 588         if (l2 >= MAXPATHLEN - l1) {
 589                 rprintf(FERROR,
 590                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 591                         flags, l1, l2, lastname, who_am_i());
 592                 overflow_exit("recv_file_entry");
 593         }
 594
 595         strlcpy(thisname, lastname, l1 + 1);
 596         read_sbuf(f, &thisname[l1], l2);
 597         thisname[l1 + l2] = 0;
 598
 599         strlcpy(lastname, thisname, MAXPATHLEN);
 600
 601         clean_fname(thisname, 0);
 602
 603         if (sanitize_paths)
 604                 sanitize_path(thisname, thisname, "", 0, NULL);
 605
 606         if ((basename = strrchr(thisname, '/')) != NULL) {
 607                 int len = basename++ - thisname;
 608                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 609                         lastdir = new_array(char, len + 1);
 610                         memcpy(lastdir, thisname, len);
 611                         lastdir[len] = '\0';
 612                         lastdir_len = len;
 613                         lastdir_depth = count_dir_elements(lastdir);
 614                 }
 615         } else
 616                 basename = thisname;
 617         basename_len = strlen(basename) + 1; /* count the '\0' */
 618
 619 #ifdef SUPPORT_HARD_LINKS
 620         if (protocol_version >= 30
 621          && BITS_SETnUNSET(flags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 622                 struct file_struct *first;
 623                 first_hlink_ndx = read_int(f);
 624                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->count) {
 625                         rprintf(FERROR,
 626                                 "hard-link reference out of range: %d (%d)\n",
 627                                 first_hlink_ndx, flist->count);
 628                         exit_cleanup(RERR_PROTOCOL);
 629                 }
 630                 first = flist->files[first_hlink_ndx];
 631                 file_length = F_LENGTH(first);
 632                 modtime = first->modtime;
 633                 mode = first->mode;
 634                 if (preserve_uid)
 635                         uid = F_UID(first);
 636                 if (preserve_gid)
 637                         gid = F_GID(first);
 638                 if ((preserve_devices && IS_DEVICE(mode))
 639                  || (preserve_specials && IS_SPECIAL(mode))) {
 640                         uint32 *devp = F_RDEV_P(first);
 641                         rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 642                 }
 643                 if (preserve_links && S_ISLNK(mode))
 644                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 645                 else
 646                         linkname_len = 0;
 647                 goto create_object;
 648         }
 649 #endif
 650
 651         file_length = read_longint(f);
 652         if (!(flags & XMIT_SAME_TIME))
 653                 modtime = (time_t)read_int(f);
 654         if (!(flags & XMIT_SAME_MODE))
 655                 mode = from_wire_mode(read_int(f));
 656
 657         if (chmod_modes && !S_ISLNK(mode))
 658                 mode = tweak_mode(mode, chmod_modes);
 659
 660         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 661                 uid = (uid_t)read_int(f);
 662                 if (flags & XMIT_USER_NAME_FOLLOWS)
 663                         uid = recv_user_name(f, uid);
 664                 else if (inc_recurse && am_root && !numeric_ids)
 665                         uid = match_uid(uid);
 666         }
 667         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 668                 gid = (gid_t)read_int(f);
 669                 if (flags & XMIT_GROUP_NAME_FOLLOWS)
 670                         gid = recv_group_name(f, gid);
 671                 else if (inc_recurse && (!am_root || !numeric_ids))
 672                         gid = match_gid(gid);
 673         }
 674
 675         if ((preserve_devices && IS_DEVICE(mode))
 676          || (preserve_specials && IS_SPECIAL(mode))) {
 677                 if (protocol_version < 28) {
 678                         if (!(flags & XMIT_SAME_RDEV_pre28))
 679                                 rdev = (dev_t)read_int(f);
 680                 } else {
 681                         uint32 rdev_minor;
 682                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 683                                 rdev_major = read_int(f);
 684                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 685                                 rdev_minor = read_byte(f);
 686                         else
 687                                 rdev_minor = read_int(f);
 688                         rdev = MAKEDEV(rdev_major, rdev_minor);
 689                 }
 690                 extra_len += 2 * EXTRA_LEN;
 691                 file_length = 0;
 692         } else if (protocol_version < 28)
 693                 rdev = MAKEDEV(0, 0);
 694
 695 #ifdef SUPPORT_LINKS
 696         if (preserve_links && S_ISLNK(mode)) {
 697                 linkname_len = read_int(f) + 1; /* count the '\0' */
 698                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 699                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 700                                 linkname_len - 1);
 701                         overflow_exit("recv_file_entry");
 702                 }
 703         }
 704         else
 705 #endif
 706                 linkname_len = 0;
 707
 708 #ifdef SUPPORT_HARD_LINKS
 709   create_object:
 710         if (preserve_hard_links) {
 711                 if (protocol_version < 28 && S_ISREG(mode))
 712                         flags |= XMIT_HLINKED;
 713                 if (flags & XMIT_HLINKED)
 714                         extra_len += EXTRA_LEN;
 715         }
 716 #endif
 717
 718         if (always_checksum && S_ISREG(mode))
 719                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 720
 721         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 722                 extra_len += EXTRA_LEN;
 723
 724 #if EXTRA_ROUNDING > 0
 725         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 726                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 727 #endif
 728
 729         if (inc_recurse && S_ISDIR(mode)) {
 730                 if (one_file_system) {
 731                         /* Room to save the dir's device for -x */
 732                         extra_len += 2 * EXTRA_LEN;
 733                 }
 734                 flist = dir_flist;
 735         }
 736
 737         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 738                   + linkname_len;
 739         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
 740
 741         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 742         bp += extra_len;
 743         file = (struct file_struct *)bp;
 744         bp += FILE_STRUCT_LEN;
 745
 746         memcpy(bp, basename, basename_len);
 747         bp += basename_len + linkname_len; /* skip space for symlink too */
 748
 749 #ifdef SUPPORT_HARD_LINKS
 750         if (flags & XMIT_HLINKED)
 751                 file->flags |= FLAG_HLINKED;
 752 #endif
 753         file->modtime = modtime;
 754         file->len32 = (uint32)file_length;
 755         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 756                 file->flags |= FLAG_LENGTH64;
 757                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 758         }
 759         file->mode = mode;
 760         if (preserve_uid)
 761                 F_OWNER(file) = uid;
 762         if (preserve_gid)
 763                 F_GROUP(file) = gid;
 764
 765         if (basename != thisname) {
 766                 file->dirname = lastdir;
 767                 F_DEPTH(file) = lastdir_depth + 1;
 768         } else
 769                 F_DEPTH(file) = 1;
 770
 771         if (S_ISDIR(mode)) {
 772                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 773                         F_DEPTH(file)--;
 774                 if (flags & XMIT_TOP_DIR) {
 775                         in_del_hier = recurse;
 776                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 777                         if (relative_paths && del_hier_name_len > 2
 778                             && lastname[del_hier_name_len-1] == '.'
 779                             && lastname[del_hier_name_len-2] == '/')
 780                                 del_hier_name_len -= 2;
 781                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 782                 } else if (in_del_hier) {
 783                         if (!relative_paths || !del_hier_name_len
 784                          || (l1 >= del_hier_name_len
 785                           && lastname[del_hier_name_len] == '/'))
 786                                 file->flags |= FLAG_XFER_DIR;
 787                         else
 788                                 in_del_hier = 0;
 789                 }
 790         }
 791
 792         if ((preserve_devices && IS_DEVICE(mode))
 793          || (preserve_specials && IS_SPECIAL(mode))) {
 794                 uint32 *devp = F_RDEV_P(file);
 795                 DEV_MAJOR(devp) = major(rdev);
 796                 DEV_MINOR(devp) = minor(rdev);
 797         }
 798
 799 #ifdef SUPPORT_LINKS
 800         if (linkname_len) {
 801                 bp = (char*)file->basename + basename_len;
 802                 if (first_hlink_ndx >= 0) {
 803                         struct file_struct *first = flist->files[first_hlink_ndx];
 804                         memcpy(bp, F_SYMLINK(first), linkname_len);
 805                 } else
 806                         read_sbuf(f, bp, linkname_len - 1);
 807                 if (sanitize_paths)
 808                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 809         }
 810 #endif
 811
 812 #ifdef SUPPORT_HARD_LINKS
 813         if (preserve_hard_links && flags & XMIT_HLINKED) {
 814                 if (protocol_version >= 30) {
 815                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 816                                         ? flist->count : first_hlink_ndx;
 817                 } else {
 818                         static int32 cnt = 0;
 819                         struct idev_node *np;
 820                         int64 ino;
 821                         int32 ndx;
 822                         if (protocol_version < 26) {
 823                                 dev = read_int(f);
 824                                 ino = read_int(f);
 825                         } else {
 826                                 if (!(flags & XMIT_SAME_DEV_pre30))
 827                                         dev = read_longint(f);
 828                                 ino = read_longint(f);
 829                         }
 830                         np = idev_node(dev, ino);
 831                         ndx = (int32)(long)np->data - 1;
 832                         if (ndx < 0) {
 833                                 ndx = cnt++;
 834                                 np->data = (void*)(long)cnt;
 835                         }
 836                         F_HL_GNUM(file) = ndx;
 837                 }
 838         }
 839 #endif
 840
 841         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 842                 if (S_ISREG(mode))
 843                         bp = (char*)F_SUM(file);
 844                 else {
 845                         /* Prior to 28, we get a useless set of nulls. */
 846                         bp = tmp_sum;
 847                 }
 848                 if (first_hlink_ndx >= 0) {
 849                         struct file_struct *first = flist->files[first_hlink_ndx];
 850                         memcpy(bp, F_SUM(first), checksum_len);
 851                 } else
 852                         read_buf(f, bp, checksum_len);
 853         }
 854
 855         if (S_ISREG(mode) || S_ISLNK(mode))
 856                 stats.total_size += file_length;
 857
 858         return file;
 859 }
 860
 861 /**
 862  * Create a file_struct for a named file by reading its stat()
 863  * information and performing extensive checks against global
 864  * options.
 865  *
 866  * @return the new file, or NULL if there was an error or this file
 867  * should be excluded.
 868  *
 869  * @todo There is a small optimization opportunity here to avoid
 870  * stat()ing the file in some circumstances, which has a certain cost.
 871  * We are called immediately after doing readdir(), and so we may
 872  * already know the d_type of the file.  We could for example avoid
 873  * statting directories if we're not recursing, but this is not a very
 874  * important case.  Some systems may not have d_type.
 875  **/
 876 struct file_struct *make_file(const char *fname, struct file_list *flist,
 877                               STRUCT_STAT *stp, int flags, int filter_level)
 878 {
 879         static char *lastdir;
 880         static int lastdir_len = -1;
 881         struct file_struct *file;
 882         STRUCT_STAT st;
 883         char thisname[MAXPATHLEN];
 884         char linkname[MAXPATHLEN];
 885         int alloc_len, basename_len, linkname_len;
 886         int extra_len = file_extra_cnt * EXTRA_LEN;
 887         const char *basename;
 888         char *bp;
 889
 890         if (strlcpy(thisname, fname, sizeof thisname)
 891             >= sizeof thisname - flist_dir_len) {
 892                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 893                 return NULL;
 894         }
 895         clean_fname(thisname, 0);
 896         if (sanitize_paths)
 897                 sanitize_path(thisname, thisname, "", 0, NULL);
 898
 899         if (stp && S_ISDIR(stp->st_mode)) {
 900                 st = *stp; /* Needed for "symlink/." with --relative. */
 901                 *linkname = '\0'; /* make IBM code checker happy */
 902         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 903                 int save_errno = errno;
 904                 /* See if file is excluded before reporting an error. */
 905                 if (filter_level != NO_FILTERS
 906                  && (is_excluded(thisname, 0, filter_level)
 907                   || is_excluded(thisname, 1, filter_level))) {
 908                         if (ignore_perishable && save_errno != ENOENT)
 909                                 non_perishable_cnt++;
 910                         return NULL;
 911                 }
 912                 if (save_errno == ENOENT) {
 913 #ifdef SUPPORT_LINKS
 914                         /* Avoid "vanished" error if symlink points nowhere. */
 915                         if (copy_links && do_lstat(thisname, &st) == 0
 916                             && S_ISLNK(st.st_mode)) {
 917                                 io_error |= IOERR_GENERAL;
 918                                 rprintf(FERROR, "symlink has no referent: %s\n",
 919                                         full_fname(thisname));
 920                         } else
 921 #endif
 922                         {
 923                                 enum logcode c = am_daemon && protocol_version < 28
 924                                     ? FERROR : FINFO;
 925                                 io_error |= IOERR_VANISHED;
 926                                 rprintf(c, "file has vanished: %s\n",
 927                                         full_fname(thisname));
 928                         }
 929                 } else {
 930                         io_error |= IOERR_GENERAL;
 931                         rsyserr(FERROR, save_errno, "readlink %s failed",
 932                                 full_fname(thisname));
 933                 }
 934                 return NULL;
 935         }
 936
 937         /* backup.c calls us with filter_level set to NO_FILTERS. */
 938         if (filter_level == NO_FILTERS)
 939                 goto skip_filters;
 940
 941         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 942                 rprintf(FINFO, "skipping directory %s\n", thisname);
 943                 return NULL;
 944         }
 945
 946         /* -x only affects directories because we need to avoid recursing
 947          * into a mount-point directory, not to avoid copying a symlinked
 948          * file if -L (or similar) was specified. */
 949         if (one_file_system && st.st_dev != filesystem_dev
 950          && S_ISDIR(st.st_mode)) {
 951                 if (one_file_system > 1) {
 952                         if (verbose > 2) {
 953                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 954                                         thisname);
 955                         }
 956                         return NULL;
 957                 }
 958                 flags |= FLAG_MOUNT_DIR;
 959         }
 960
 961         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
 962                 if (ignore_perishable)
 963                         non_perishable_cnt++;
 964                 return NULL;
 965         }
 966
 967         if (lp_ignore_nonreadable(module_id)) {
 968 #ifdef SUPPORT_LINKS
 969                 if (!S_ISLNK(st.st_mode))
 970 #endif
 971                         if (access(thisname, R_OK) != 0)
 972                                 return NULL;
 973         }
 974
 975   skip_filters:
 976
 977         /* Only divert a directory in the main transfer. */
 978         if (flist && flist->prev && S_ISDIR(st.st_mode)
 979          && flags & FLAG_DIVERT_DIRS) {
 980                 flist = dir_flist;
 981                 /* Room for parent/sibling/next-child info. */
 982                 extra_len += 3 * EXTRA_LEN;
 983         }
 984
 985         if (verbose > 2) {
 986                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 987                         who_am_i(), thisname, filter_level);
 988         }
 989
 990         if ((basename = strrchr(thisname, '/')) != NULL) {
 991                 int len = basename++ - thisname;
 992                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 993                         lastdir = new_array(char, len + 1);
 994                         memcpy(lastdir, thisname, len);
 995                         lastdir[len] = '\0';
 996                         lastdir_len = len;
 997                 }
 998         } else
 999                 basename = thisname;
1000         basename_len = strlen(basename) + 1; /* count the '\0' */
1001
1002 #ifdef SUPPORT_LINKS
1003         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1004 #else
1005         linkname_len = 0;
1006 #endif
1007
1008         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1009                 extra_len += EXTRA_LEN;
1010
1011 #if EXTRA_ROUNDING > 0
1012         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1013                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1014 #endif
1015
1016         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1017                   + linkname_len;
1018         if (flist)
1019                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1020         else {
1021                 if (!(bp = new_array(char, alloc_len)))
1022                         out_of_memory("make_file");
1023         }
1024
1025         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1026         bp += extra_len;
1027         file = (struct file_struct *)bp;
1028         bp += FILE_STRUCT_LEN;
1029
1030         memcpy(bp, basename, basename_len);
1031         bp += basename_len + linkname_len; /* skip space for symlink too */
1032
1033 #ifdef SUPPORT_HARD_LINKS
1034         if (preserve_hard_links && flist && flist->prev) {
1035                 if (protocol_version >= 28
1036                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1037                  : S_ISREG(st.st_mode)) {
1038                         tmp_dev = st.st_dev;
1039                         tmp_ino = st.st_ino;
1040                 } else
1041                         tmp_dev = 0;
1042         }
1043 #endif
1044
1045 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1046         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1047                 tmp_rdev = st.st_rdev;
1048                 st.st_size = 0;
1049         }
1050 #endif
1051
1052         file->flags = flags;
1053         file->modtime = st.st_mtime;
1054         file->len32 = (uint32)st.st_size;
1055         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1056                 file->flags |= FLAG_LENGTH64;
1057                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1058         }
1059         file->mode = st.st_mode;
1060         if (preserve_uid)
1061                 F_OWNER(file) = st.st_uid;
1062         if (preserve_gid)
1063                 F_GROUP(file) = st.st_gid;
1064
1065         if (basename != thisname)
1066                 file->dirname = lastdir;
1067
1068 #ifdef SUPPORT_LINKS
1069         if (linkname_len) {
1070                 bp = (char*)file->basename + basename_len;
1071                 memcpy(bp, linkname, linkname_len);
1072         }
1073 #endif
1074
1075         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1076                 file_checksum(thisname, tmp_sum, st.st_size);
1077
1078         F_ROOTDIR(file) = flist_dir;
1079
1080         /* This code is only used by the receiver when it is building
1081          * a list of files for a delete pass. */
1082         if (keep_dirlinks && linkname_len && flist) {
1083                 STRUCT_STAT st2;
1084                 int save_mode = file->mode;
1085                 file->mode = S_IFDIR; /* Find a directory with our name. */
1086                 if (flist_find(dir_flist, file) >= 0
1087                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
1088                         file->modtime = st2.st_mtime;
1089                         file->len32 = 0;
1090                         file->mode = st2.st_mode;
1091                         if (preserve_uid)
1092                                 F_OWNER(file) = st2.st_uid;
1093                         if (preserve_gid)
1094                                 F_GROUP(file) = st2.st_gid;
1095                 } else
1096                         file->mode = save_mode;
1097         }
1098
1099         if (basename_len == 0+1)
1100                 return NULL;
1101
1102         if (inc_recurse && flist == dir_flist) {
1103                 flist_expand(flist);
1104                 flist->files[flist->count++] = file;
1105         }
1106
1107         return file;
1108 }
1109
1110 /* Only called for temporary file_struct entries created by make_file(). */
1111 void unmake_file(struct file_struct *file)
1112 {
1113         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1114 #if EXTRA_ROUNDING > 0
1115         if (extra_cnt & EXTRA_ROUNDING)
1116                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1117 #endif
1118         free(REQ_EXTRA(file, extra_cnt));
1119 }
1120
1121 static struct file_struct *send_file_name(int f, struct file_list *flist,
1122                                           char *fname, STRUCT_STAT *stp,
1123                                           int flags, int filter_flags)
1124 {
1125         struct file_struct *file;
1126
1127         file = make_file(fname, flist, stp, flags, filter_flags);
1128         if (!file)
1129                 return NULL;
1130
1131         if (chmod_modes && !S_ISLNK(file->mode))
1132                 file->mode = tweak_mode(file->mode, chmod_modes);
1133
1134         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1135
1136         flist_expand(flist);
1137         flist->files[flist->count++] = file;
1138         if (f >= 0)
1139                 send_file_entry(f, file, flist->count - 1);
1140         return file;
1141 }
1142
1143 static void send_if_directory(int f, struct file_list *flist,
1144                               struct file_struct *file,
1145                               char *fbuf, unsigned int ol,
1146                               int flags)
1147 {
1148         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1149
1150         if (S_ISDIR(file->mode)
1151             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1152                 void *save_filters;
1153                 unsigned int len = strlen(fbuf);
1154                 if (len > 1 && fbuf[len-1] == '/')
1155                         fbuf[--len] = '\0';
1156                 if (len >= MAXPATHLEN - 1) {
1157                         io_error |= IOERR_GENERAL;
1158                         rprintf(FERROR, "skipping long-named directory: %s\n",
1159                                 full_fname(fbuf));
1160                         return;
1161                 }
1162                 save_filters = push_local_filters(fbuf, len);
1163                 send_directory(f, flist, -1, fbuf, len, flags);
1164                 pop_local_filters(save_filters);
1165                 fbuf[ol] = '\0';
1166                 if (is_dot_dir)
1167                         fbuf[ol-1] = '.';
1168         }
1169 }
1170
1171 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1172 {
1173         return f_name_cmp(*file1, *file2);
1174 }
1175
1176 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1177  * sort them by name, and link them into the tree, setting the appropriate
1178  * parent/child/sibling pointers. */
1179 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1180 {
1181         int i;
1182         int32 *dp = NULL;
1183         int32 *parent_dp = parent_ndx < 0 ? NULL
1184                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1185
1186         qsort(dir_flist->files + start, end - start + 1,
1187               sizeof dir_flist->files[0], (int (*)())file_compare);
1188
1189         for (i = start; i <= end; i++) {
1190                 struct file_struct *file = dir_flist->files[i];
1191                 if (!(file->flags & FLAG_XFER_DIR)
1192                  || file->flags & FLAG_MOUNT_DIR)
1193                         continue;
1194                 if (dp)
1195                         DIR_NEXT_SIBLING(dp) = i;
1196                 else if (parent_dp)
1197                         DIR_FIRST_CHILD(parent_dp) = i;
1198                 else
1199                         send_dir_ndx = i;
1200                 dp = F_DIRNODE_P(file);
1201                 DIR_PARENT(dp) = parent_ndx;
1202                 DIR_FIRST_CHILD(dp) = -1;
1203         }
1204         if (dp)
1205                 DIR_NEXT_SIBLING(dp) = -1;
1206 }
1207
1208 /* This function is normally called by the sender, but the receiving side also
1209  * calls it from get_dirlist() with f set to -1 so that we just construct the
1210  * file list in memory without sending it over the wire.  Also, get_dirlist()
1211  * might call this with f set to -2, which also indicates that local filter
1212  * rules should be ignored. */
1213 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1214                            char *fbuf, int len, int flags)
1215 {
1216         struct dirent *di;
1217         unsigned remainder;
1218         char *p;
1219         DIR *d;
1220         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1221         int start = divert_dirs ? dir_flist->count : flist->count;
1222         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1223
1224         assert(flist != NULL);
1225
1226         if (!(d = opendir(fbuf))) {
1227                 io_error |= IOERR_GENERAL;
1228                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1229                 return;
1230         }
1231
1232         p = fbuf + len;
1233         if (len != 1 || *fbuf != '/')
1234                 *p++ = '/';
1235         *p = '\0';
1236         remainder = MAXPATHLEN - (p - fbuf);
1237
1238         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1239                 char *dname = d_name(di);
1240                 if (dname[0] == '.' && (dname[1] == '\0'
1241                     || (dname[1] == '.' && dname[2] == '\0')))
1242                         continue;
1243                 if (strlcpy(p, dname, remainder) >= remainder) {
1244                         io_error |= IOERR_GENERAL;
1245                         rprintf(FINFO,
1246                                 "cannot send long-named file %s\n",
1247                                 full_fname(fbuf));
1248                         continue;
1249                 }
1250
1251                 send_file_name(f, flist, fbuf, NULL, flags, filter_flags);
1252         }
1253
1254         fbuf[len] = '\0';
1255
1256         if (errno) {
1257                 io_error |= IOERR_GENERAL;
1258                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1259         }
1260
1261         closedir(d);
1262
1263         if (f < 0)
1264                 return;
1265
1266         if (divert_dirs)
1267                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1268         else if (recurse) {
1269                 int i, end = flist->count - 1;
1270                 /* send_if_directory() bumps flist->count, so use "end". */
1271                 for (i = start; i <= end; i++)
1272                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1273         }
1274 }
1275
1276 void send_extra_file_list(int f, int at_least)
1277 {
1278         char fbuf[MAXPATHLEN];
1279         struct file_list *flist;
1280         int64 start_write;
1281         int future_cnt, save_io_error = io_error;
1282
1283         if (send_dir_ndx < 0)
1284                 return;
1285
1286         /* Keep sending data until we have the requested number of
1287          * files in the upcoming file-lists. */
1288         if (cur_flist->next) {
1289                 flist = first_flist->prev; /* the newest flist */
1290                 future_cnt = flist->count
1291                            + flist->ndx_start - cur_flist->next->ndx_start;
1292         } else
1293                 future_cnt = 0;
1294         while (future_cnt < at_least) {
1295                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1296                 int32 *dp;
1297                 int dlen;
1298
1299                 f_name(file, fbuf);
1300                 dlen = strlen(fbuf);
1301
1302                 if (F_ROOTDIR(file) != flist_dir) {
1303                         if (!push_flist_dir(F_ROOTDIR(file), -1))
1304                                 exit_cleanup(RERR_FILESELECT);
1305                 }
1306
1307                 flist = flist_new(0, "send_extra_file_list");
1308                 start_write = stats.total_written;
1309
1310                 write_ndx(f, NDX_FLIST_OFFSET - send_dir_ndx);
1311                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1312                 send_directory(f, flist, send_dir_ndx, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1313                 write_byte(f, 0);
1314
1315                 clean_flist(flist, 0, 0);
1316                 file_total += flist->count;
1317                 future_cnt += flist->count;
1318                 stats.flist_size += stats.total_written - start_write;
1319                 stats.num_files += flist->count;
1320                 if (verbose > 3)
1321                         output_flist(flist);
1322
1323                 dp = F_DIRNODE_P(file);
1324                 if (DIR_FIRST_CHILD(dp) >= 0) {
1325                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1326                         send_dir_depth++;
1327                 } else {
1328                         while (DIR_NEXT_SIBLING(dp) < 0) {
1329                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1330                                         write_ndx(f, NDX_FLIST_EOF);
1331                                         flist_eof = 1;
1332                                         change_local_filter_dir(NULL, 0, 0);
1333                                         goto finish;
1334                                 }
1335                                 send_dir_depth--;
1336                                 file = dir_flist->files[send_dir_ndx];
1337                                 dp = F_DIRNODE_P(file);
1338                         }
1339                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1340                 }
1341         }
1342
1343   finish:
1344         if (io_error != save_io_error && !ignore_errors)
1345                 send_msg_int(MSG_IO_ERROR, io_error);
1346 }
1347
1348 struct file_list *send_file_list(int f, int argc, char *argv[])
1349 {
1350         int len;
1351         STRUCT_STAT st;
1352         char *p, *dir;
1353         char lastpath[MAXPATHLEN] = "";
1354         struct file_list *flist;
1355         struct timeval start_tv, end_tv;
1356         int64 start_write;
1357         int use_ff_fd = 0;
1358         int flags, disable_buffering;
1359
1360         rprintf(FLOG, "building file list\n");
1361         if (show_filelist_p())
1362                 start_filelist_progress("building file list");
1363         else if (inc_recurse && verbose && !am_server)
1364                 rprintf(FCLIENT, "sending incremental file list\n");
1365
1366         start_write = stats.total_written;
1367         gettimeofday(&start_tv, NULL);
1368
1369 #ifdef SUPPORT_HARD_LINKS
1370         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1371                 init_hard_links();
1372 #endif
1373
1374         flist = cur_flist = flist_new(0, "send_file_list");
1375         if (inc_recurse) {
1376                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1377                 flags = FLAG_DIVERT_DIRS;
1378         } else {
1379                 dir_flist = cur_flist;
1380                 flags = 0;
1381         }
1382
1383         disable_buffering = io_start_buffering_out(f);
1384         if (filesfrom_fd >= 0) {
1385                 if (argv[0] && !push_dir(argv[0], 0)) {
1386                         rsyserr(FERROR, errno, "push_dir %s failed",
1387                                 full_fname(argv[0]));
1388                         exit_cleanup(RERR_FILESELECT);
1389                 }
1390                 use_ff_fd = 1;
1391         }
1392
1393         while (1) {
1394                 char fbuf[MAXPATHLEN];
1395                 char *fn;
1396                 int is_dot_dir;
1397
1398                 if (use_ff_fd) {
1399                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1400                                 break;
1401                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1402                 } else {
1403                         if (argc-- == 0)
1404                                 break;
1405                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1406                         if (sanitize_paths)
1407                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1408                 }
1409
1410                 len = strlen(fbuf);
1411                 if (relative_paths) {
1412                         /* We clean up fbuf below. */
1413                         is_dot_dir = 0;
1414                 } else if (!len || fbuf[len - 1] == '/') {
1415                         if (len == 2 && fbuf[0] == '.') {
1416                                 /* Turn "./" into just "." rather than "./." */
1417                                 fbuf[1] = '\0';
1418                         } else {
1419                                 if (len + 1 >= MAXPATHLEN)
1420                                         overflow_exit("send_file_list");
1421                                 fbuf[len++] = '.';
1422                                 fbuf[len] = '\0';
1423                         }
1424                         is_dot_dir = 1;
1425                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1426                     && (len == 2 || fbuf[len-3] == '/')) {
1427                         if (len + 2 >= MAXPATHLEN)
1428                                 overflow_exit("send_file_list");
1429                         fbuf[len++] = '/';
1430                         fbuf[len++] = '.';
1431                         fbuf[len] = '\0';
1432                         is_dot_dir = 1;
1433                 } else {
1434                         is_dot_dir = fbuf[len-1] == '.'
1435                                    && (len == 1 || fbuf[len-2] == '/');
1436                 }
1437
1438                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1439                         io_error |= IOERR_GENERAL;
1440                         rsyserr(FERROR, errno, "link_stat %s failed",
1441                                 full_fname(fbuf));
1442                         continue;
1443                 }
1444
1445                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1446                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1447                         continue;
1448                 }
1449
1450                 dir = NULL;
1451
1452                 if (!relative_paths) {
1453                         p = strrchr(fbuf, '/');
1454                         if (p) {
1455                                 *p = '\0';
1456                                 if (p == fbuf)
1457                                         dir = "/";
1458                                 else
1459                                         dir = fbuf;
1460                                 len -= p - fbuf + 1;
1461                                 fn = p + 1;
1462                         } else
1463                                 fn = fbuf;
1464                 } else {
1465                         if ((p = strstr(fbuf, "/./")) != NULL) {
1466                                 *p = '\0';
1467                                 if (p == fbuf)
1468                                         dir = "/";
1469                                 else
1470                                         dir = fbuf;
1471                                 len -= p - fbuf + 3;
1472                                 fn = p + 3;
1473                         } else
1474                                 fn = fbuf;
1475                         /* Get rid of trailing "/" and "/.". */
1476                         while (len) {
1477                                 if (fn[len - 1] == '/') {
1478                                         is_dot_dir = 1;
1479                                         if (!--len && !dir) {
1480                                                 len++;
1481                                                 break;
1482                                         }
1483                                 }
1484                                 else if (len >= 2 && fn[len - 1] == '.'
1485                                                   && fn[len - 2] == '/') {
1486                                         is_dot_dir = 1;
1487                                         if (!(len -= 2) && !dir) {
1488                                                 len++;
1489                                                 break;
1490                                         }
1491                                 } else
1492                                         break;
1493                         }
1494                         if (len == 1 && fn[0] == '/')
1495                                 fn[len++] = '.';
1496                         fn[len] = '\0';
1497                         /* Reject a ".." dir in the active part of the path. */
1498                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1499                                 if ((p[2] == '/' || p[2] == '\0')
1500                                  && (p == fn || p[-1] == '/')) {
1501                                         rprintf(FERROR,
1502                                             "found \"..\" dir in relative path: %s\n",
1503                                             fbuf);
1504                                         exit_cleanup(RERR_SYNTAX);
1505                                 }
1506                         }
1507                 }
1508
1509                 if (!*fn) {
1510                         len = 1;
1511                         fn = ".";
1512                 }
1513
1514                 if (dir && *dir) {
1515                         static const char *lastdir;
1516                         static int lastdir_len = -1;
1517                         int len = strlen(dir);
1518
1519                         if (len != lastdir_len || memcmp(lastdir, dir, len) != 0) {
1520                                 if (!push_flist_dir(strdup(dir), len))
1521                                         goto push_error;
1522                                 lastdir = flist_dir;
1523                                 lastdir_len = flist_dir_len;
1524                         } else if (!push_flist_dir(lastdir, lastdir_len)) {
1525                           push_error:
1526                                 io_error |= IOERR_GENERAL;
1527                                 rsyserr(FERROR, errno, "push_dir %s failed",
1528                                         full_fname(dir));
1529                                 continue;
1530                         }
1531                 }
1532
1533                 if (fn != fbuf)
1534                         memmove(fbuf, fn, len + 1);
1535
1536                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1537                         /* Send the implied directories at the start of the
1538                          * source spec, so we get their permissions right. */
1539                         char *lp = lastpath, *slash = fbuf;
1540                         *p = '\0';
1541                         /* Skip any initial directories in our path that we
1542                          * have in common with lastpath. */
1543                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1544                                 if (*fn == '/')
1545                                         slash = fn;
1546                         }
1547                         *p = '/';
1548                         if (fn != p || (*lp && *lp != '/')) {
1549                                 int save_copy_links = copy_links;
1550                                 int save_xfer_dirs = xfer_dirs;
1551                                 int dir_flags = inc_recurse ? FLAG_DIVERT_DIRS : 0;
1552                                 copy_links |= copy_unsafe_links;
1553                                 xfer_dirs = 1;
1554                                 while ((slash = strchr(slash+1, '/')) != 0) {
1555                                         *slash = '\0';
1556                                         send_file_name(f, flist, fbuf, NULL,
1557                                                        dir_flags, ALL_FILTERS);
1558                                         *slash = '/';
1559                                 }
1560                                 copy_links = save_copy_links;
1561                                 xfer_dirs = save_xfer_dirs;
1562                                 *p = '\0';
1563                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1564                                 *p = '/';
1565                         }
1566                 }
1567
1568                 if (one_file_system)
1569                         filesystem_dev = st.st_dev;
1570
1571                 if (recurse || (xfer_dirs && is_dot_dir)) {
1572                         struct file_struct *file;
1573                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR
1574                                       | (is_dot_dir ? 0 : flags)
1575                                       | (inc_recurse ? FLAG_DIVERT_DIRS : 0);
1576                         file = send_file_name(f, flist, fbuf, &st,
1577                                               top_flags, ALL_FILTERS);
1578                         if (file && !inc_recurse)
1579                                 send_if_directory(f, flist, file, fbuf, len, flags);
1580                 } else
1581                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1582         }
1583
1584         gettimeofday(&end_tv, NULL);
1585         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1586                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1587         if (stats.flist_buildtime == 0)
1588                 stats.flist_buildtime = 1;
1589         start_tv = end_tv;
1590
1591         write_byte(f, 0); /* Indicate end of file list */
1592
1593 #ifdef SUPPORT_HARD_LINKS
1594         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1595                 idev_destroy();
1596 #endif
1597
1598         if (show_filelist_p())
1599                 finish_filelist_progress(flist);
1600
1601         gettimeofday(&end_tv, NULL);
1602         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1603                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1604
1605         /* Sort the list without removing any duplicates in non-incremental
1606          * mode.  This allows the receiving side to ask for whatever name it
1607          * kept.  For incremental mode, the sender also removes duplicates
1608          * in this initial file-list so that it avoids re-sending duplicated
1609          * directories. */
1610         clean_flist(flist, 0, inc_recurse);
1611         file_total += flist->count;
1612
1613         if (!numeric_ids && !inc_recurse)
1614                 send_uid_list(f);
1615
1616         /* send the io_error flag */
1617         if (protocol_version < 30)
1618                 write_int(f, ignore_errors ? 0 : io_error);
1619         else if (io_error && !ignore_errors)
1620                 send_msg_int(MSG_IO_ERROR, io_error);
1621
1622         if (disable_buffering)
1623                 io_end_buffering_out();
1624
1625         stats.flist_size = stats.total_written - start_write;
1626         stats.num_files = flist->count;
1627
1628         if (verbose > 3)
1629                 output_flist(flist);
1630
1631         if (verbose > 2)
1632                 rprintf(FINFO, "send_file_list done\n");
1633
1634         if (inc_recurse) {
1635                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1636                 if (file_total == 1) {
1637                         /* If we're creating incremental file-lists and there
1638                          * was just 1 item in the first file-list, send 1 more
1639                          * file-list to check if this is a 1-file xfer. */
1640                         if (send_dir_ndx < 0)
1641                                 write_ndx(f, NDX_DONE);
1642                         else
1643                                 send_extra_file_list(f, 1);
1644                 }
1645         }
1646
1647         return flist;
1648 }
1649
1650 struct file_list *recv_file_list(int f)
1651 {
1652         struct file_list *flist;
1653         int dstart, flags;
1654         int64 start_read;
1655
1656         if (!first_flist)
1657                 rprintf(FLOG, "receiving file list\n");
1658         if (show_filelist_p())
1659                 start_filelist_progress("receiving file list");
1660         else if (inc_recurse && verbose && !am_server && !first_flist)
1661                 rprintf(FCLIENT, "receiving incremental file list\n");
1662
1663         start_read = stats.total_read;
1664
1665         flist = flist_new(0, "recv_file_list");
1666
1667 #ifdef SUPPORT_HARD_LINKS
1668         if (preserve_hard_links && protocol_version < 30)
1669                 init_hard_links();
1670 #endif
1671
1672         if (inc_recurse) {
1673                 if (flist->ndx_start == 0)
1674                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1675                 dstart = dir_flist->count;
1676         } else {
1677                 dir_flist = flist;
1678                 dstart = 0;
1679         }
1680
1681         while ((flags = read_byte(f)) != 0) {
1682                 struct file_struct *file;
1683
1684                 flist_expand(flist);
1685
1686                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1687                         flags |= read_byte(f) << 8;
1688                 file = recv_file_entry(flist, flags, f);
1689
1690                 if (inc_recurse && S_ISDIR(file->mode)) {
1691                         flist_expand(dir_flist);
1692                         dir_flist->files[dir_flist->count++] = file;
1693                 }
1694
1695                 flist->files[flist->count++] = file;
1696
1697                 maybe_emit_filelist_progress(flist->count);
1698
1699                 if (verbose > 2) {
1700                         rprintf(FINFO, "recv_file_name(%s)\n",
1701                                 f_name(file, NULL));
1702                 }
1703         }
1704         file_total += flist->count;
1705
1706         if (verbose > 2)
1707                 rprintf(FINFO, "received %d names\n", flist->count);
1708
1709         if (show_filelist_p())
1710                 finish_filelist_progress(flist);
1711
1712         clean_flist(flist, relative_paths, 1);
1713
1714         if (inc_recurse) {
1715                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1716                       sizeof dir_flist->files[0], (int (*)())file_compare);
1717         } else if (f >= 0)
1718                 recv_uid_list(f, flist);
1719
1720         if (protocol_version < 30) {
1721                 /* Recv the io_error flag */
1722                 if (ignore_errors)
1723                         read_int(f);
1724                 else
1725                         io_error |= read_int(f);
1726         }
1727
1728         if (verbose > 3)
1729                 output_flist(flist);
1730
1731         if (list_only) {
1732                 int i;
1733                 for (i = 0; i < flist->count; i++)
1734                         list_file_entry(flist->files[i]);
1735         }
1736
1737         if (verbose > 2)
1738                 rprintf(FINFO, "recv_file_list done\n");
1739
1740         stats.flist_size += stats.total_read - start_read;
1741         stats.num_files += flist->count;
1742
1743         return flist;
1744 }
1745
1746 /* This is only used once by the receiver if the very first file-list
1747  * has exactly one item in it. */
1748 void recv_additional_file_list(int f)
1749 {
1750         struct file_list *flist;
1751         int ndx = read_ndx(f);
1752         if (ndx == NDX_DONE) {
1753                 flist_eof = 1;
1754                 change_local_filter_dir(NULL, 0, 0);
1755         } else {
1756                 ndx = NDX_FLIST_OFFSET - ndx;
1757                 if (ndx < 0 || ndx >= dir_flist->count) {
1758                         ndx = NDX_FLIST_OFFSET - ndx;
1759                         rprintf(FERROR,
1760                                 "Invalid dir index: %d (%d - %d)\n",
1761                                 ndx, NDX_FLIST_OFFSET,
1762                                 NDX_FLIST_OFFSET - dir_flist->count);
1763                         exit_cleanup(RERR_PROTOCOL);
1764                 }
1765                 flist = recv_file_list(f);
1766                 flist->parent_ndx = ndx;
1767         }
1768 }
1769
1770 /* Search for an identically-named item in the file list.  Note that the
1771  * items must agree in their directory-ness, or no match is returned. */
1772 int flist_find(struct file_list *flist, struct file_struct *f)
1773 {
1774         int low = flist->low, high = flist->high;
1775         int diff, mid, mid_up;
1776
1777         while (low <= high) {
1778                 mid = (low + high) / 2;
1779                 if (F_IS_ACTIVE(flist->files[mid]))
1780                         mid_up = mid;
1781                 else {
1782                         /* Scan for the next non-empty entry using the cached
1783                          * distance values.  If the value isn't fully up-to-
1784                          * date, update it. */
1785                         mid_up = mid + F_DEPTH(flist->files[mid]);
1786                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1787                                 do {
1788                                     mid_up += F_DEPTH(flist->files[mid_up]);
1789                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1790                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1791                         }
1792                         if (mid_up > high) {
1793                                 /* If there's nothing left above us, set high to
1794                                  * a non-empty entry below us and continue. */
1795                                 high = mid - (int)flist->files[mid]->len32;
1796                                 if (!F_IS_ACTIVE(flist->files[high])) {
1797                                         do {
1798                                             high -= (int)flist->files[high]->len32;
1799                                         } while (!F_IS_ACTIVE(flist->files[high]));
1800                                         flist->files[mid]->len32 = mid - high;
1801                                 }
1802                                 continue;
1803                         }
1804                 }
1805                 diff = f_name_cmp(flist->files[mid_up], f);
1806                 if (diff == 0) {
1807                         if (protocol_version < 29
1808                             && S_ISDIR(flist->files[mid_up]->mode)
1809                             != S_ISDIR(f->mode))
1810                                 return -1;
1811                         return mid_up;
1812                 }
1813                 if (diff < 0)
1814                         low = mid_up + 1;
1815                 else
1816                         high = mid - 1;
1817         }
1818         return -1;
1819 }
1820
1821 /*
1822  * Free up any resources a file_struct has allocated
1823  * and clear the file.
1824  */
1825 void clear_file(struct file_struct *file)
1826 {
1827         /* The +1 zeros out the first char of the basename. */
1828         memset(file, 0, FILE_STRUCT_LEN + 1);
1829         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1830          * entry.  Likewise for len32 in the opposite direction.  We assume
1831          * that we're alone for now since flist_find() will adjust the counts
1832          * it runs into that aren't up-to-date. */
1833         file->len32 = F_DEPTH(file) = 1;
1834 }
1835
1836 /* Allocate a new file list. */
1837 struct file_list *flist_new(int flags, char *msg)
1838 {
1839         struct file_list *flist;
1840
1841         flist = new(struct file_list);
1842         if (!flist)
1843                 out_of_memory(msg);
1844
1845         memset(flist, 0, sizeof flist[0]);
1846
1847         if (!(flags & FLIST_TEMP)) {
1848                 if (first_flist) {
1849                         flist->ndx_start = first_flist->prev->ndx_start
1850                                          + first_flist->prev->count;
1851                 }
1852                 /* This is a doubly linked list with prev looping back to
1853                  * the end of the list, but the last next pointer is NULL. */
1854                 if (!first_flist)
1855                         first_flist = cur_flist = flist->prev = flist;
1856                 else {
1857                         flist->prev = first_flist->prev;
1858                         flist->prev->next = first_flist->prev = flist;
1859                 }
1860                 flist_cnt++;
1861         }
1862
1863         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1864                 out_of_memory(msg);
1865
1866         return flist;
1867 }
1868
1869 /* Free up all elements in a flist. */
1870 void flist_free(struct file_list *flist)
1871 {
1872         if (!flist->prev)
1873                 ; /* Was FLIST_TEMP dir-list. */
1874         else if (flist == flist->prev) {
1875                 first_flist = cur_flist = NULL;
1876                 file_total = 0;
1877                 flist_cnt = 0;
1878         } else {
1879                 if (flist == cur_flist)
1880                         cur_flist = flist->next;
1881                 if (flist == first_flist)
1882                         first_flist = first_flist->next;
1883                 else {
1884                         flist->prev->next = flist->next;
1885                         if (!flist->next)
1886                                 flist->next = first_flist;
1887                 }
1888                 flist->next->prev = flist->prev;
1889                 file_total -= flist->count;
1890                 flist_cnt--;
1891         }
1892
1893         pool_destroy(flist->file_pool);
1894         free(flist->files);
1895         free(flist);
1896 }
1897
1898 /*
1899  * This routine ensures we don't have any duplicate names in our file list.
1900  * duplicate names can cause corruption because of the pipelining
1901  */
1902 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1903 {
1904         char fbuf[MAXPATHLEN];
1905         int i, prev_i = 0;
1906
1907         if (!flist)
1908                 return;
1909         if (flist->count == 0) {
1910                 flist->high = -1;
1911                 return;
1912         }
1913
1914         qsort(flist->files, flist->count,
1915             sizeof flist->files[0], (int (*)())file_compare);
1916
1917         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1918                 if (F_IS_ACTIVE(flist->files[i])) {
1919                         prev_i = i;
1920                         break;
1921                 }
1922         }
1923         flist->low = prev_i;
1924         while (++i < flist->count) {
1925                 int j;
1926                 struct file_struct *file = flist->files[i];
1927
1928                 if (!F_IS_ACTIVE(file))
1929                         continue;
1930                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1931                         j = prev_i;
1932                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1933                         int save_mode = file->mode;
1934                         /* Make sure that this directory doesn't duplicate a
1935                          * non-directory earlier in the list. */
1936                         flist->high = prev_i;
1937                         file->mode = S_IFREG;
1938                         j = flist_find(flist, file);
1939                         file->mode = save_mode;
1940                 } else
1941                         j = -1;
1942                 if (j >= 0) {
1943                         struct file_struct *fp = flist->files[j];
1944                         int keep, drop;
1945                         /* If one is a dir and the other is not, we want to
1946                          * keep the dir because it might have contents in the
1947                          * list. */
1948                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1949                                 if (S_ISDIR(file->mode))
1950                                         keep = i, drop = j;
1951                                 else
1952                                         keep = j, drop = i;
1953                         } else if (protocol_version < 27)
1954                                 keep = j, drop = i;
1955                         else
1956                                 keep = i, drop = j;
1957                         if (verbose > 1 && !am_server) {
1958                                 rprintf(FINFO,
1959                                         "removing duplicate name %s from file list (%d)\n",
1960                                         f_name(file, fbuf), drop);
1961                         }
1962                         /* Make sure we don't lose track of a user-specified
1963                          * top directory. */
1964                         flist->files[keep]->flags |= flist->files[drop]->flags
1965                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
1966
1967                         clear_file(flist->files[drop]);
1968
1969                         if (keep == i) {
1970                                 if (flist->low == drop) {
1971                                         for (j = drop + 1;
1972                                              j < i && !F_IS_ACTIVE(flist->files[j]);
1973                                              j++) {}
1974                                         flist->low = j;
1975                                 }
1976                                 prev_i = i;
1977                         }
1978                 } else
1979                         prev_i = i;
1980         }
1981         flist->high = no_dups ? prev_i : flist->count - 1;
1982
1983         if (strip_root) {
1984                 /* We need to strip off the leading slashes for relative
1985                  * paths, but this must be done _after_ the sorting phase. */
1986                 for (i = flist->low; i <= flist->high; i++) {
1987                         struct file_struct *file = flist->files[i];
1988
1989                         if (!file->dirname)
1990                                 continue;
1991                         while (*file->dirname == '/')
1992                                 file->dirname++;
1993                         if (!*file->dirname)
1994                                 file->dirname = NULL;
1995                 }
1996         }
1997
1998         if (prune_empty_dirs && no_dups) {
1999                 int j, prev_depth = 0;
2000
2001                 prev_i = 0; /* It's OK that this isn't really true. */
2002
2003                 for (i = flist->low; i <= flist->high; i++) {
2004                         struct file_struct *fp, *file = flist->files[i];
2005
2006                         /* This temporarily abuses the F_DEPTH() value for a
2007                          * directory that is in a chain that might get pruned.
2008                          * We restore the old value if it gets a reprieve. */
2009                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2010                                 /* Dump empty dirs when coming back down. */
2011                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2012                                         fp = flist->files[prev_i];
2013                                         if (F_DEPTH(fp) >= 0)
2014                                                 break;
2015                                         prev_i = -F_DEPTH(fp)-1;
2016                                         clear_file(fp);
2017                                 }
2018                                 prev_depth = F_DEPTH(file);
2019                                 if (is_excluded(f_name(file, fbuf), 1,
2020                                                        ALL_FILTERS)) {
2021                                         /* Keep dirs through this dir. */
2022                                         for (j = prev_depth-1; ; j--) {
2023                                                 fp = flist->files[prev_i];
2024                                                 if (F_DEPTH(fp) >= 0)
2025                                                         break;
2026                                                 prev_i = -F_DEPTH(fp)-1;
2027                                                 F_DEPTH(fp) = j;
2028                                         }
2029                                 } else
2030                                         F_DEPTH(file) = -prev_i-1;
2031                                 prev_i = i;
2032                         } else {
2033                                 /* Keep dirs through this non-dir. */
2034                                 for (j = prev_depth; ; j--) {
2035                                         fp = flist->files[prev_i];
2036                                         if (F_DEPTH(fp) >= 0)
2037                                                 break;
2038                                         prev_i = -F_DEPTH(fp)-1;
2039                                         F_DEPTH(fp) = j;
2040                                 }
2041                         }
2042                 }
2043                 /* Dump all remaining empty dirs. */
2044                 while (1) {
2045                         struct file_struct *fp = flist->files[prev_i];
2046                         if (F_DEPTH(fp) >= 0)
2047                                 break;
2048                         prev_i = -F_DEPTH(fp)-1;
2049                         clear_file(fp);
2050                 }
2051
2052                 for (i = flist->low; i <= flist->high; i++) {
2053                         if (F_IS_ACTIVE(flist->files[i]))
2054                                 break;
2055                 }
2056                 flist->low = i;
2057                 for (i = flist->high; i >= flist->low; i--) {
2058                         if (F_IS_ACTIVE(flist->files[i]))
2059                                 break;
2060                 }
2061                 flist->high = i;
2062         }
2063 }
2064
2065 static void output_flist(struct file_list *flist)
2066 {
2067         char uidbuf[16], gidbuf[16], depthbuf[16];
2068         struct file_struct *file;
2069         const char *root, *dir, *slash, *name, *trail;
2070         const char *who = who_am_i();
2071         int i;
2072
2073         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2074                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2075         for (i = 0; i < flist->count; i++) {
2076                 file = flist->files[i];
2077                 if ((am_root || am_sender) && preserve_uid) {
2078                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2079                                  (long)F_UID(file));
2080                 } else
2081                         *uidbuf = '\0';
2082                 if (preserve_gid && F_GID(file) != GID_NONE) {
2083                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2084                                  (long)F_GID(file));
2085                 } else
2086                         *gidbuf = '\0';
2087                 if (!am_sender)
2088                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2089                 if (F_IS_ACTIVE(file)) {
2090                         root = am_sender ? NS(F_ROOTDIR(file)) : depthbuf;
2091                         if ((dir = file->dirname) == NULL)
2092                                 dir = slash = "";
2093                         else
2094                                 slash = "/";
2095                         name = file->basename;
2096                         trail = S_ISDIR(file->mode) ? "/" : "";
2097                 } else
2098                         root = dir = slash = name = trail = "";
2099                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2100                         who, i, root, dir, slash, name, trail, (int)file->mode,
2101                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2102         }
2103 }
2104
2105 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2106 enum fnc_type { t_PATH, t_ITEM };
2107
2108 /* Compare the names of two file_struct entities, similar to how strcmp()
2109  * would do if it were operating on the joined strings.
2110  *
2111  * Some differences beginning with protocol_version 29: (1) directory names
2112  * are compared with an assumed trailing slash so that they compare in a
2113  * way that would cause them to sort immediately prior to any content they
2114  * may have; (2) a directory of any name compares after a non-directory of
2115  * any name at the same depth; (3) a directory with name "." compares prior
2116  * to anything else.  These changes mean that a directory and a non-dir
2117  * with the same name will not compare as equal (protocol_version >= 29).
2118  *
2119  * The dirname component can be an empty string, but the basename component
2120  * cannot (and never is in the current codebase).  The basename component
2121  * may be NULL (for a removed item), in which case it is considered to be
2122  * after any existing item. */
2123 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2124 {
2125         int dif;
2126         const uchar *c1, *c2;
2127         enum fnc_state state1, state2;
2128         enum fnc_type type1, type2;
2129         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2130
2131         if (!f1 || !F_IS_ACTIVE(f1)) {
2132                 if (!f2 || !F_IS_ACTIVE(f2))
2133                         return 0;
2134                 return -1;
2135         }
2136         if (!f2 || !F_IS_ACTIVE(f2))
2137                 return 1;
2138
2139         c1 = (uchar*)f1->dirname;
2140         c2 = (uchar*)f2->dirname;
2141         if (c1 == c2)
2142                 c1 = c2 = NULL;
2143         if (!c1) {
2144                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2145                 c1 = (const uchar*)f1->basename;
2146                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2147                         type1 = t_ITEM;
2148                         state1 = s_TRAILING;
2149                         c1 = (uchar*)"";
2150                 } else
2151                         state1 = s_BASE;
2152         } else {
2153                 type1 = t_path;
2154                 state1 = s_DIR;
2155         }
2156         if (!c2) {
2157                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2158                 c2 = (const uchar*)f2->basename;
2159                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2160                         type2 = t_ITEM;
2161                         state2 = s_TRAILING;
2162                         c2 = (uchar*)"";
2163                 } else
2164                         state2 = s_BASE;
2165         } else {
2166                 type2 = t_path;
2167                 state2 = s_DIR;
2168         }
2169
2170         if (type1 != type2)
2171                 return type1 == t_PATH ? 1 : -1;
2172
2173         do {
2174                 if (!*c1) {
2175                         switch (state1) {
2176                         case s_DIR:
2177                                 state1 = s_SLASH;
2178                                 c1 = (uchar*)"/";
2179                                 break;
2180                         case s_SLASH:
2181                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2182                                 c1 = (const uchar*)f1->basename;
2183                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2184                                         type1 = t_ITEM;
2185                                         state1 = s_TRAILING;
2186                                         c1 = (uchar*)"";
2187                                 } else
2188                                         state1 = s_BASE;
2189                                 break;
2190                         case s_BASE:
2191                                 state1 = s_TRAILING;
2192                                 if (type1 == t_PATH) {
2193                                         c1 = (uchar*)"/";
2194                                         break;
2195                                 }
2196                                 /* FALL THROUGH */
2197                         case s_TRAILING:
2198                                 type1 = t_ITEM;
2199                                 break;
2200                         }
2201                         if (*c2 && type1 != type2)
2202                                 return type1 == t_PATH ? 1 : -1;
2203                 }
2204                 if (!*c2) {
2205                         switch (state2) {
2206                         case s_DIR:
2207                                 state2 = s_SLASH;
2208                                 c2 = (uchar*)"/";
2209                                 break;
2210                         case s_SLASH:
2211                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2212                                 c2 = (const uchar*)f2->basename;
2213                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2214                                         type2 = t_ITEM;
2215                                         state2 = s_TRAILING;
2216                                         c2 = (uchar*)"";
2217                                 } else
2218                                         state2 = s_BASE;
2219                                 break;
2220                         case s_BASE:
2221                                 state2 = s_TRAILING;
2222                                 if (type2 == t_PATH) {
2223                                         c2 = (uchar*)"/";
2224                                         break;
2225                                 }
2226                                 /* FALL THROUGH */
2227                         case s_TRAILING:
2228                                 if (!*c1)
2229                                         return 0;
2230                                 type2 = t_ITEM;
2231                                 break;
2232                         }
2233                         if (type1 != type2)
2234                                 return type1 == t_PATH ? 1 : -1;
2235                 }
2236         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2237
2238         return dif;
2239 }
2240
2241 char *f_name_buf(void)
2242 {
2243         static char names[5][MAXPATHLEN];
2244         static unsigned int n;
2245
2246         n = (n + 1) % (sizeof names / sizeof names[0]);
2247
2248         return names[n];
2249 }
2250
2251 /* Return a copy of the full filename of a flist entry, using the indicated
2252  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2253  * done because we checked the size when creating the file_struct entry.
2254  */
2255 char *f_name(struct file_struct *f, char *fbuf)
2256 {
2257         if (!f || !F_IS_ACTIVE(f))
2258                 return NULL;
2259
2260         if (!fbuf)
2261                 fbuf = f_name_buf();
2262
2263         if (f->dirname) {
2264                 int len = strlen(f->dirname);
2265                 memcpy(fbuf, f->dirname, len);
2266                 fbuf[len] = '/';
2267                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2268         } else
2269                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2270
2271         return fbuf;
2272 }
2273
2274 /* Do a non-recursive scan of the named directory, possibly ignoring all
2275  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2276  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2277  * buffer (the functions we call will append names onto the end, but the old
2278  * dir value will be restored on exit). */
2279 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2280 {
2281         struct file_list *dirlist;
2282         char dirbuf[MAXPATHLEN];
2283         int save_recurse = recurse;
2284         int save_xfer_dirs = xfer_dirs;
2285
2286         if (dlen < 0) {
2287                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2288                 if (dlen >= MAXPATHLEN)
2289                         return NULL;
2290                 dirname = dirbuf;
2291         }
2292
2293         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2294
2295         recurse = 0;
2296         xfer_dirs = 1;
2297         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2298         xfer_dirs = save_xfer_dirs;
2299         recurse = save_recurse;
2300         if (do_progress)
2301                 flist_count_offset += dirlist->count;
2302
2303         clean_flist(dirlist, 0, 0);
2304
2305         if (verbose > 3)
2306                 output_flist(dirlist);
2307
2308         return dirlist;
2309 }