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) 2002-2007 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 version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include "rsync.h"
  24 #include "rounding.h"
  25
  26 extern int verbose;
  27 extern int list_only;
  28 extern int am_root;
  29 extern int am_server;
  30 extern int am_daemon;
  31 extern int am_sender;
  32 extern int inc_recurse;
  33 extern int do_progress;
  34 extern int always_checksum;
  35 extern int module_id;
  36 extern int ignore_errors;
  37 extern int numeric_ids;
  38 extern int recurse;
  39 extern int xfer_dirs;
  40 extern int filesfrom_fd;
  41 extern int one_file_system;
  42 extern int copy_dirlinks;
  43 extern int keep_dirlinks;
  44 extern int preserve_acls;
  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         /* TODO: indicate '+' if the entry has an ACL. */
 157
 158 #ifdef SUPPORT_LINKS
 159         if (preserve_links && S_ISLNK(f->mode)) {
 160                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 161                         permbuf, len, timestring(f->modtime),
 162                         f_name(f, NULL), F_SYMLINK(f));
 163         } else
 164 #endif
 165         {
 166                 rprintf(FINFO, "%s %11.0f %s %s\n",
 167                         permbuf, len, timestring(f->modtime),
 168                         f_name(f, NULL));
 169         }
 170 }
 171
 172 /* Stat either a symlink or its referent, depending on the settings of
 173  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 174  *
 175  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 176  * MAXPATHLEN chars) will be set to the symlink's target string.
 177  *
 178  * The stat structure pointed to by stp will contain information about the
 179  * link or the referent as appropriate, if they exist. */
 180 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 181 {
 182 #ifdef SUPPORT_LINKS
 183         if (link_stat(path, stp, copy_dirlinks) < 0)
 184                 return -1;
 185         if (S_ISLNK(stp->st_mode)) {
 186                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 187                 if (llen < 0)
 188                         return -1;
 189                 linkbuf[llen] = '\0';
 190                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 191                         if (verbose > 1) {
 192                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 193                                         path, linkbuf);
 194                         }
 195                         return do_stat(path, stp);
 196                 }
 197         }
 198         return 0;
 199 #else
 200         return do_stat(path, stp);
 201 #endif
 202 }
 203
 204 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 205 {
 206 #ifdef SUPPORT_LINKS
 207         if (copy_links)
 208                 return do_stat(path, stp);
 209         if (do_lstat(path, stp) < 0)
 210                 return -1;
 211         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 212                 STRUCT_STAT st;
 213                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 214                         *stp = st;
 215         }
 216         return 0;
 217 #else
 218         return do_stat(path, stp);
 219 #endif
 220 }
 221
 222 /* This function is used to check if a file should be included/excluded
 223  * from the list of files based on its name and type etc.  The value of
 224  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 225 static int is_excluded(char *fname, int is_dir, int filter_level)
 226 {
 227 #if 0 /* This currently never happens, so avoid a useless compare. */
 228         if (filter_level == NO_FILTERS)
 229                 return 0;
 230 #endif
 231         if (fname) {
 232                 /* never exclude '.', even if somebody does --exclude '*' */
 233                 if (fname[0] == '.' && !fname[1])
 234                         return 0;
 235                 /* Handle the -R version of the '.' dir. */
 236                 if (fname[0] == '/') {
 237                         int len = strlen(fname);
 238                         if (fname[len-1] == '.' && fname[len-2] == '/')
 239                                 return 0;
 240                 }
 241         }
 242         if (server_filter_list.head
 243             && check_filter(&server_filter_list, fname, is_dir) < 0)
 244                 return 1;
 245         if (filter_level != ALL_FILTERS)
 246                 return 0;
 247         if (filter_list.head
 248             && check_filter(&filter_list, fname, is_dir) < 0)
 249                 return 1;
 250         return 0;
 251 }
 252
 253 static int to_wire_mode(mode_t mode)
 254 {
 255 #ifdef SUPPORT_LINKS
 256 #if _S_IFLNK != 0120000
 257         if (S_ISLNK(mode))
 258                 return (mode & ~(_S_IFMT)) | 0120000;
 259 #endif
 260 #endif
 261         return mode;
 262 }
 263
 264 static mode_t from_wire_mode(int mode)
 265 {
 266 #if _S_IFLNK != 0120000
 267         if ((mode & (_S_IFMT)) == 0120000)
 268                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 269 #endif
 270         return mode;
 271 }
 272
 273 static void send_directory(int f, struct file_list *flist, int ndx,
 274                            char *fbuf, int len, int flags);
 275
 276 static const char *flist_dir, *orig_dir;
 277 static int flist_dir_len;
 278
 279
 280 /**
 281  * Make sure @p flist is big enough to hold at least @p flist->count
 282  * entries.
 283  **/
 284 void flist_expand(struct file_list *flist)
 285 {
 286         struct file_struct **new_ptr;
 287
 288         if (flist->count < flist->malloced)
 289                 return;
 290
 291         if (flist->malloced < FLIST_START)
 292                 flist->malloced = FLIST_START;
 293         else if (flist->malloced >= FLIST_LINEAR)
 294                 flist->malloced += FLIST_LINEAR;
 295         else
 296                 flist->malloced *= 2;
 297
 298         /*
 299          * In case count jumped or we are starting the list
 300          * with a known size just set it.
 301          */
 302         if (flist->malloced < flist->count)
 303                 flist->malloced = flist->count;
 304
 305         new_ptr = realloc_array(flist->files, struct file_struct *,
 306                                 flist->malloced);
 307
 308         if (verbose >= 2 && flist->malloced != FLIST_START) {
 309                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
 310                     who_am_i(),
 311                     (double)sizeof flist->files[0] * flist->malloced,
 312                     (new_ptr == flist->files) ? " not" : "");
 313         }
 314
 315         flist->files = new_ptr;
 316
 317         if (!flist->files)
 318                 out_of_memory("flist_expand");
 319 }
 320
 321 int push_flist_dir(const char *dir, int len)
 322 {
 323         if (dir == flist_dir)
 324                 return 1;
 325
 326         if (!orig_dir)
 327                 orig_dir = strdup(curr_dir);
 328
 329         if (flist_dir && !pop_dir(orig_dir)) {
 330                 rsyserr(FERROR, errno, "pop_dir %s failed",
 331                         full_fname(orig_dir));
 332                 exit_cleanup(RERR_FILESELECT);
 333         }
 334
 335         if (dir && !push_dir(dir, 0)) {
 336                 io_error |= IOERR_GENERAL;
 337                 rsyserr(FERROR, errno, "push_dir %s failed",
 338                         full_fname(dir));
 339                 return 0;
 340         }
 341
 342         flist_dir = dir;
 343         flist_dir_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 344
 345         return 1;
 346 }
 347
 348 static void send_file_entry(int f, struct file_struct *file, int ndx)
 349 {
 350         static time_t modtime;
 351         static mode_t mode;
 352         static int64 dev;
 353         static dev_t rdev;
 354         static uint32 rdev_major;
 355         static uid_t uid;
 356         static gid_t gid;
 357         static char *user_name, *group_name;
 358         static char lastname[MAXPATHLEN];
 359         char fname[MAXPATHLEN];
 360         int first_hlink_ndx = -1;
 361         int l1, l2;
 362         int flags;
 363
 364         f_name(file, fname);
 365
 366         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 367
 368         if (file->mode == mode)
 369                 flags |= XMIT_SAME_MODE;
 370         else
 371                 mode = file->mode;
 372         if ((preserve_devices && IS_DEVICE(mode))
 373          || (preserve_specials && IS_SPECIAL(mode))) {
 374                 if (protocol_version < 28) {
 375                         if (tmp_rdev == rdev)
 376                                 flags |= XMIT_SAME_RDEV_pre28;
 377                         else
 378                                 rdev = tmp_rdev;
 379                 } else {
 380                         rdev = tmp_rdev;
 381                         if ((uint32)major(rdev) == rdev_major)
 382                                 flags |= XMIT_SAME_RDEV_MAJOR;
 383                         else
 384                                 rdev_major = major(rdev);
 385                         if ((uint32)minor(rdev) <= 0xFFu)
 386                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 387                 }
 388         } else if (protocol_version < 28)
 389                 rdev = MAKEDEV(0, 0);
 390         if (preserve_uid) {
 391                 if (F_UID(file) == uid && *lastname)
 392                         flags |= XMIT_SAME_UID;
 393                 else {
 394                         uid = F_UID(file);
 395                         if (preserve_uid && !numeric_ids) {
 396                                 user_name = add_uid(uid);
 397                                 if (inc_recurse && user_name)
 398                                         flags |= XMIT_USER_NAME_FOLLOWS;
 399                         }
 400                 }
 401         }
 402         if (preserve_gid) {
 403                 if (F_GID(file) == gid && *lastname)
 404                         flags |= XMIT_SAME_GID;
 405                 else {
 406                         gid = F_GID(file);
 407                         if (preserve_gid && !numeric_ids) {
 408                                 group_name = add_gid(gid);
 409                                 if (inc_recurse && group_name)
 410                                         flags |= XMIT_GROUP_NAME_FOLLOWS;
 411                         }
 412                 }
 413         }
 414         if (file->modtime == modtime)
 415                 flags |= XMIT_SAME_TIME;
 416         else
 417                 modtime = file->modtime;
 418
 419 #ifdef SUPPORT_HARD_LINKS
 420         if (tmp_dev != 0) {
 421                 if (protocol_version >= 30) {
 422                         struct idev_node *np = idev_node(tmp_dev, tmp_ino);
 423                         first_hlink_ndx = (int32)(long)np->data - 1;
 424                         if (first_hlink_ndx < 0) {
 425                                 np->data = (void*)(long)(ndx + 1);
 426                                 flags |= XMIT_HLINK_FIRST;
 427                         }
 428                         flags |= XMIT_HLINKED;
 429                 } else {
 430                         if (tmp_dev == dev) {
 431                                 if (protocol_version >= 28)
 432                                         flags |= XMIT_SAME_DEV_pre30;
 433                         } else
 434                                 dev = tmp_dev;
 435                         flags |= XMIT_HLINKED;
 436                 }
 437         }
 438 #endif
 439
 440         for (l1 = 0;
 441             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 442             l1++) {}
 443         l2 = strlen(fname+l1);
 444
 445         if (l1 > 0)
 446                 flags |= XMIT_SAME_NAME;
 447         if (l2 > 255)
 448                 flags |= XMIT_LONG_NAME;
 449
 450         /* We must make sure we don't send a zero flag byte or the
 451          * other end will terminate the flist transfer.  Note that
 452          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 453          * it's harmless way to add a bit to the first flag byte. */
 454         if (protocol_version >= 28) {
 455                 if (!flags && !S_ISDIR(mode))
 456                         flags |= XMIT_TOP_DIR;
 457                 if ((flags & 0xFF00) || !flags) {
 458                         flags |= XMIT_EXTENDED_FLAGS;
 459                         write_shortint(f, flags);
 460                 } else
 461                         write_byte(f, flags);
 462         } else {
 463                 if (!(flags & 0xFF))
 464                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 465                 write_byte(f, flags);
 466         }
 467         if (flags & XMIT_SAME_NAME)
 468                 write_byte(f, l1);
 469         if (flags & XMIT_LONG_NAME)
 470                 write_abbrevint30(f, l2);
 471         else
 472                 write_byte(f, l2);
 473         write_buf(f, fname + l1, l2);
 474
 475         if (first_hlink_ndx >= 0) {
 476                 write_abbrevint30(f, first_hlink_ndx);
 477                 goto the_end;
 478         }
 479
 480         write_longint(f, F_LENGTH(file));
 481         if (!(flags & XMIT_SAME_TIME))
 482                 write_int(f, modtime);
 483         if (!(flags & XMIT_SAME_MODE))
 484                 write_int(f, to_wire_mode(mode));
 485         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 486                 write_abbrevint30(f, uid);
 487                 if (flags & XMIT_USER_NAME_FOLLOWS) {
 488                         int len = strlen(user_name);
 489                         write_byte(f, len);
 490                         write_buf(f, user_name, len);
 491                 }
 492         }
 493         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 494                 write_abbrevint30(f, gid);
 495                 if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 496                         int len = strlen(group_name);
 497                         write_byte(f, len);
 498                         write_buf(f, group_name, len);
 499                 }
 500         }
 501         if ((preserve_devices && IS_DEVICE(mode))
 502          || (preserve_specials && IS_SPECIAL(mode))) {
 503                 if (protocol_version < 28) {
 504                         if (!(flags & XMIT_SAME_RDEV_pre28))
 505                                 write_int(f, (int)rdev);
 506                 } else {
 507                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 508                                 write_int(f, major(rdev));
 509                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 510                                 write_byte(f, minor(rdev));
 511                         else
 512                                 write_int(f, minor(rdev));
 513                 }
 514         }
 515
 516 #ifdef SUPPORT_LINKS
 517         if (preserve_links && S_ISLNK(mode)) {
 518                 const char *sl = F_SYMLINK(file);
 519                 int len = strlen(sl);
 520                 write_abbrevint30(f, len);
 521                 write_buf(f, sl, len);
 522         }
 523 #endif
 524
 525 #ifdef SUPPORT_HARD_LINKS
 526         if (tmp_dev != 0 && protocol_version < 30) {
 527                 if (protocol_version < 26) {
 528                         /* 32-bit dev_t and ino_t */
 529                         write_int(f, (int32)dev);
 530                         write_int(f, (int32)tmp_ino);
 531                 } else {
 532                         /* 64-bit dev_t and ino_t */
 533                         if (!(flags & XMIT_SAME_DEV_pre30))
 534                                 write_longint(f, dev);
 535                         write_longint(f, tmp_ino);
 536                 }
 537         }
 538 #endif
 539
 540         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 541                 const char *sum;
 542                 if (S_ISREG(mode))
 543                         sum = tmp_sum;
 544                 else {
 545                         /* Prior to 28, we sent a useless set of nulls. */
 546                         sum = empty_sum;
 547                 }
 548                 write_buf(f, sum, checksum_len);
 549         }
 550
 551   the_end:
 552         strlcpy(lastname, fname, MAXPATHLEN);
 553
 554         if (S_ISREG(mode) || S_ISLNK(mode))
 555                 stats.total_size += F_LENGTH(file);
 556 }
 557
 558 static struct file_struct *recv_file_entry(struct file_list *flist,
 559                                            int flags, int f)
 560 {
 561         static time_t modtime;
 562         static mode_t mode;
 563         static int64 dev;
 564         static dev_t rdev;
 565         static uint32 rdev_major;
 566         static uid_t uid;
 567         static gid_t gid;
 568         static char lastname[MAXPATHLEN], *lastdir;
 569         static int lastdir_depth, lastdir_len = -1;
 570         static unsigned int del_hier_name_len = 0;
 571         static int in_del_hier = 0;
 572         char thisname[MAXPATHLEN];
 573         unsigned int l1 = 0, l2 = 0;
 574         int alloc_len, basename_len, linkname_len;
 575         int extra_len = file_extra_cnt * EXTRA_LEN;
 576         int first_hlink_ndx = -1;
 577         OFF_T file_length;
 578         const char *basename;
 579         char *bp;
 580         struct file_struct *file;
 581
 582         if (flags & XMIT_SAME_NAME)
 583                 l1 = read_byte(f);
 584
 585         if (flags & XMIT_LONG_NAME)
 586                 l2 = read_abbrevint30(f);
 587         else
 588                 l2 = read_byte(f);
 589
 590         if (l2 >= MAXPATHLEN - l1) {
 591                 rprintf(FERROR,
 592                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 593                         flags, l1, l2, lastname, who_am_i());
 594                 overflow_exit("recv_file_entry");
 595         }
 596
 597         strlcpy(thisname, lastname, l1 + 1);
 598         read_sbuf(f, &thisname[l1], l2);
 599         thisname[l1 + l2] = 0;
 600
 601         strlcpy(lastname, thisname, MAXPATHLEN);
 602
 603         clean_fname(thisname, 0);
 604
 605         if (sanitize_paths)
 606                 sanitize_path(thisname, thisname, "", 0, NULL);
 607
 608         if ((basename = strrchr(thisname, '/')) != NULL) {
 609                 int len = basename++ - thisname;
 610                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 611                         lastdir = new_array(char, len + 1);
 612                         memcpy(lastdir, thisname, len);
 613                         lastdir[len] = '\0';
 614                         lastdir_len = len;
 615                         lastdir_depth = count_dir_elements(lastdir);
 616                 }
 617         } else
 618                 basename = thisname;
 619         basename_len = strlen(basename) + 1; /* count the '\0' */
 620
 621 #ifdef SUPPORT_HARD_LINKS
 622         if (protocol_version >= 30
 623          && BITS_SETnUNSET(flags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 624                 struct file_struct *first;
 625                 first_hlink_ndx = read_abbrevint30(f);
 626                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->count) {
 627                         rprintf(FERROR,
 628                                 "hard-link reference out of range: %d (%d)\n",
 629                                 first_hlink_ndx, flist->count);
 630                         exit_cleanup(RERR_PROTOCOL);
 631                 }
 632                 first = flist->files[first_hlink_ndx];
 633                 file_length = F_LENGTH(first);
 634                 modtime = first->modtime;
 635                 mode = first->mode;
 636                 if (preserve_uid)
 637                         uid = F_UID(first);
 638                 if (preserve_gid)
 639                         gid = F_GID(first);
 640                 if ((preserve_devices && IS_DEVICE(mode))
 641                  || (preserve_specials && IS_SPECIAL(mode))) {
 642                         uint32 *devp = F_RDEV_P(first);
 643                         rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 644                 }
 645                 if (preserve_links && S_ISLNK(mode))
 646                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 647                 else
 648                         linkname_len = 0;
 649                 goto create_object;
 650         }
 651 #endif
 652
 653         file_length = read_longint(f);
 654         if (!(flags & XMIT_SAME_TIME))
 655                 modtime = (time_t)read_int(f);
 656         if (!(flags & XMIT_SAME_MODE))
 657                 mode = from_wire_mode(read_int(f));
 658
 659         if (chmod_modes && !S_ISLNK(mode))
 660                 mode = tweak_mode(mode, chmod_modes);
 661
 662         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 663                 uid = (uid_t)read_abbrevint30(f);
 664                 if (flags & XMIT_USER_NAME_FOLLOWS)
 665                         uid = recv_user_name(f, uid);
 666                 else if (inc_recurse && am_root && !numeric_ids)
 667                         uid = match_uid(uid);
 668         }
 669         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 670                 gid = (gid_t)read_abbrevint30(f);
 671                 if (flags & XMIT_GROUP_NAME_FOLLOWS)
 672                         gid = recv_group_name(f, gid);
 673                 else if (inc_recurse && (!am_root || !numeric_ids))
 674                         gid = match_gid(gid);
 675         }
 676
 677         if ((preserve_devices && IS_DEVICE(mode))
 678          || (preserve_specials && IS_SPECIAL(mode))) {
 679                 if (protocol_version < 28) {
 680                         if (!(flags & XMIT_SAME_RDEV_pre28))
 681                                 rdev = (dev_t)read_int(f);
 682                 } else {
 683                         uint32 rdev_minor;
 684                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 685                                 rdev_major = read_int(f);
 686                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 687                                 rdev_minor = read_byte(f);
 688                         else
 689                                 rdev_minor = read_int(f);
 690                         rdev = MAKEDEV(rdev_major, rdev_minor);
 691                 }
 692                 extra_len += 2 * EXTRA_LEN;
 693                 file_length = 0;
 694         } else if (protocol_version < 28)
 695                 rdev = MAKEDEV(0, 0);
 696
 697 #ifdef SUPPORT_LINKS
 698         if (preserve_links && S_ISLNK(mode)) {
 699                 linkname_len = read_abbrevint30(f) + 1; /* count the '\0' */
 700                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 701                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 702                                 linkname_len - 1);
 703                         overflow_exit("recv_file_entry");
 704                 }
 705         }
 706         else
 707 #endif
 708                 linkname_len = 0;
 709
 710 #ifdef SUPPORT_HARD_LINKS
 711   create_object:
 712         if (preserve_hard_links) {
 713                 if (protocol_version < 28 && S_ISREG(mode))
 714                         flags |= XMIT_HLINKED;
 715                 if (flags & XMIT_HLINKED)
 716                         extra_len += EXTRA_LEN;
 717         }
 718 #endif
 719
 720 #ifdef SUPPORT_ACLS
 721         /* We need one or two index int32s when we're preserving ACLs. */
 722         if (preserve_acls)
 723                 extra_len += (S_ISDIR(mode) ? 2 : 1) * EXTRA_LEN;
 724 #endif
 725
 726         if (always_checksum && S_ISREG(mode))
 727                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 728
 729         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 730                 extra_len += EXTRA_LEN;
 731
 732 #if EXTRA_ROUNDING > 0
 733         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 734                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 735 #endif
 736
 737         if (inc_recurse && S_ISDIR(mode)) {
 738                 if (one_file_system) {
 739                         /* Room to save the dir's device for -x */
 740                         extra_len += 2 * EXTRA_LEN;
 741                 }
 742                 flist = dir_flist;
 743         }
 744
 745         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 746                   + linkname_len;
 747         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
 748
 749         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 750         bp += extra_len;
 751         file = (struct file_struct *)bp;
 752         bp += FILE_STRUCT_LEN;
 753
 754         memcpy(bp, basename, basename_len);
 755         bp += basename_len + linkname_len; /* skip space for symlink too */
 756
 757 #ifdef SUPPORT_HARD_LINKS
 758         if (flags & XMIT_HLINKED)
 759                 file->flags |= FLAG_HLINKED;
 760 #endif
 761         file->modtime = modtime;
 762         file->len32 = (uint32)file_length;
 763         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 764                 file->flags |= FLAG_LENGTH64;
 765                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 766         }
 767         file->mode = mode;
 768         if (preserve_uid)
 769                 F_OWNER(file) = uid;
 770         if (preserve_gid)
 771                 F_GROUP(file) = gid;
 772
 773         if (basename != thisname) {
 774                 file->dirname = lastdir;
 775                 F_DEPTH(file) = lastdir_depth + 1;
 776         } else
 777                 F_DEPTH(file) = 1;
 778
 779         if (S_ISDIR(mode)) {
 780                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 781                         F_DEPTH(file)--;
 782                 if (flags & XMIT_TOP_DIR) {
 783                         in_del_hier = recurse;
 784                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 785                         if (relative_paths && del_hier_name_len > 2
 786                             && lastname[del_hier_name_len-1] == '.'
 787                             && lastname[del_hier_name_len-2] == '/')
 788                                 del_hier_name_len -= 2;
 789                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 790                 } else if (in_del_hier) {
 791                         if (!relative_paths || !del_hier_name_len
 792                          || (l1 >= del_hier_name_len
 793                           && lastname[del_hier_name_len] == '/'))
 794                                 file->flags |= FLAG_XFER_DIR;
 795                         else
 796                                 in_del_hier = 0;
 797                 }
 798         }
 799
 800         if ((preserve_devices && IS_DEVICE(mode))
 801          || (preserve_specials && IS_SPECIAL(mode))) {
 802                 uint32 *devp = F_RDEV_P(file);
 803                 DEV_MAJOR(devp) = major(rdev);
 804                 DEV_MINOR(devp) = minor(rdev);
 805         }
 806
 807 #ifdef SUPPORT_LINKS
 808         if (linkname_len) {
 809                 bp = (char*)file->basename + basename_len;
 810                 if (first_hlink_ndx >= 0) {
 811                         struct file_struct *first = flist->files[first_hlink_ndx];
 812                         memcpy(bp, F_SYMLINK(first), linkname_len);
 813                 } else
 814                         read_sbuf(f, bp, linkname_len - 1);
 815                 if (sanitize_paths)
 816                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 817         }
 818 #endif
 819
 820 #ifdef SUPPORT_HARD_LINKS
 821         if (preserve_hard_links && flags & XMIT_HLINKED) {
 822                 if (protocol_version >= 30) {
 823                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 824                                         ? flist->count : first_hlink_ndx;
 825                 } else {
 826                         static int32 cnt = 0;
 827                         struct idev_node *np;
 828                         int64 ino;
 829                         int32 ndx;
 830                         if (protocol_version < 26) {
 831                                 dev = read_int(f);
 832                                 ino = read_int(f);
 833                         } else {
 834                                 if (!(flags & XMIT_SAME_DEV_pre30))
 835                                         dev = read_longint(f);
 836                                 ino = read_longint(f);
 837                         }
 838                         np = idev_node(dev, ino);
 839                         ndx = (int32)(long)np->data - 1;
 840                         if (ndx < 0) {
 841                                 ndx = cnt++;
 842                                 np->data = (void*)(long)cnt;
 843                         }
 844                         F_HL_GNUM(file) = ndx;
 845                 }
 846         }
 847 #endif
 848
 849         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 850                 if (S_ISREG(mode))
 851                         bp = (char*)F_SUM(file);
 852                 else {
 853                         /* Prior to 28, we get a useless set of nulls. */
 854                         bp = tmp_sum;
 855                 }
 856                 if (first_hlink_ndx >= 0) {
 857                         struct file_struct *first = flist->files[first_hlink_ndx];
 858                         memcpy(bp, F_SUM(first), checksum_len);
 859                 } else
 860                         read_buf(f, bp, checksum_len);
 861         }
 862
 863 #ifdef SUPPORT_ACLS
 864         if (preserve_acls && !S_ISLNK(mode))
 865                 receive_acl(file, f);
 866 #endif
 867
 868         if (S_ISREG(mode) || S_ISLNK(mode))
 869                 stats.total_size += file_length;
 870
 871         return file;
 872 }
 873
 874 /**
 875  * Create a file_struct for a named file by reading its stat()
 876  * information and performing extensive checks against global
 877  * options.
 878  *
 879  * @return the new file, or NULL if there was an error or this file
 880  * should be excluded.
 881  *
 882  * @todo There is a small optimization opportunity here to avoid
 883  * stat()ing the file in some circumstances, which has a certain cost.
 884  * We are called immediately after doing readdir(), and so we may
 885  * already know the d_type of the file.  We could for example avoid
 886  * statting directories if we're not recursing, but this is not a very
 887  * important case.  Some systems may not have d_type.
 888  **/
 889 struct file_struct *make_file(const char *fname, struct file_list *flist,
 890                               STRUCT_STAT *stp, int flags, int filter_level)
 891 {
 892         static char *lastdir;
 893         static int lastdir_len = -1;
 894         struct file_struct *file;
 895         STRUCT_STAT st;
 896         char thisname[MAXPATHLEN];
 897         char linkname[MAXPATHLEN];
 898         int alloc_len, basename_len, linkname_len;
 899         int extra_len = file_extra_cnt * EXTRA_LEN;
 900         const char *basename;
 901         char *bp;
 902
 903         if (strlcpy(thisname, fname, sizeof thisname)
 904             >= sizeof thisname - flist_dir_len) {
 905                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 906                 return NULL;
 907         }
 908         clean_fname(thisname, 0);
 909         if (sanitize_paths)
 910                 sanitize_path(thisname, thisname, "", 0, NULL);
 911
 912         if (stp && S_ISDIR(stp->st_mode)) {
 913                 st = *stp; /* Needed for "symlink/." with --relative. */
 914                 *linkname = '\0'; /* make IBM code checker happy */
 915         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 916                 int save_errno = errno;
 917                 /* See if file is excluded before reporting an error. */
 918                 if (filter_level != NO_FILTERS
 919                  && (is_excluded(thisname, 0, filter_level)
 920                   || is_excluded(thisname, 1, filter_level))) {
 921                         if (ignore_perishable && save_errno != ENOENT)
 922                                 non_perishable_cnt++;
 923                         return NULL;
 924                 }
 925                 if (save_errno == ENOENT) {
 926 #ifdef SUPPORT_LINKS
 927                         /* Avoid "vanished" error if symlink points nowhere. */
 928                         if (copy_links && do_lstat(thisname, &st) == 0
 929                             && S_ISLNK(st.st_mode)) {
 930                                 io_error |= IOERR_GENERAL;
 931                                 rprintf(FERROR, "symlink has no referent: %s\n",
 932                                         full_fname(thisname));
 933                         } else
 934 #endif
 935                         {
 936                                 enum logcode c = am_daemon && protocol_version < 28
 937                                     ? FERROR : FINFO;
 938                                 io_error |= IOERR_VANISHED;
 939                                 rprintf(c, "file has vanished: %s\n",
 940                                         full_fname(thisname));
 941                         }
 942                 } else {
 943                         io_error |= IOERR_GENERAL;
 944                         rsyserr(FERROR, save_errno, "readlink %s failed",
 945                                 full_fname(thisname));
 946                 }
 947                 return NULL;
 948         }
 949
 950         /* backup.c calls us with filter_level set to NO_FILTERS. */
 951         if (filter_level == NO_FILTERS)
 952                 goto skip_filters;
 953
 954         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 955                 rprintf(FINFO, "skipping directory %s\n", thisname);
 956                 return NULL;
 957         }
 958
 959         /* -x only affects directories because we need to avoid recursing
 960          * into a mount-point directory, not to avoid copying a symlinked
 961          * file if -L (or similar) was specified. */
 962         if (one_file_system && st.st_dev != filesystem_dev
 963          && S_ISDIR(st.st_mode)) {
 964                 if (one_file_system > 1) {
 965                         if (verbose > 2) {
 966                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 967                                         thisname);
 968                         }
 969                         return NULL;
 970                 }
 971                 flags |= FLAG_MOUNT_DIR;
 972         }
 973
 974         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
 975                 if (ignore_perishable)
 976                         non_perishable_cnt++;
 977                 return NULL;
 978         }
 979
 980         if (lp_ignore_nonreadable(module_id)) {
 981 #ifdef SUPPORT_LINKS
 982                 if (!S_ISLNK(st.st_mode))
 983 #endif
 984                         if (access(thisname, R_OK) != 0)
 985                                 return NULL;
 986         }
 987
 988   skip_filters:
 989
 990         /* Only divert a directory in the main transfer. */
 991         if (flist && flist->prev && S_ISDIR(st.st_mode)
 992          && flags & FLAG_DIVERT_DIRS) {
 993                 flist = dir_flist;
 994                 /* Room for parent/sibling/next-child info. */
 995                 extra_len += 3 * EXTRA_LEN;
 996         }
 997
 998         if (verbose > 2) {
 999                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1000                         who_am_i(), thisname, filter_level);
1001         }
1002
1003         if ((basename = strrchr(thisname, '/')) != NULL) {
1004                 int len = basename++ - thisname;
1005                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1006                         lastdir = new_array(char, len + 1);
1007                         memcpy(lastdir, thisname, len);
1008                         lastdir[len] = '\0';
1009                         lastdir_len = len;
1010                 }
1011         } else
1012                 basename = thisname;
1013         basename_len = strlen(basename) + 1; /* count the '\0' */
1014
1015 #ifdef SUPPORT_LINKS
1016         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1017 #else
1018         linkname_len = 0;
1019 #endif
1020
1021         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1022                 extra_len += EXTRA_LEN;
1023
1024 #if EXTRA_ROUNDING > 0
1025         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1026                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1027 #endif
1028
1029         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1030                   + linkname_len;
1031         if (flist)
1032                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1033         else {
1034                 if (!(bp = new_array(char, alloc_len)))
1035                         out_of_memory("make_file");
1036         }
1037
1038         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1039         bp += extra_len;
1040         file = (struct file_struct *)bp;
1041         bp += FILE_STRUCT_LEN;
1042
1043         memcpy(bp, basename, basename_len);
1044         bp += basename_len + linkname_len; /* skip space for symlink too */
1045
1046 #ifdef SUPPORT_HARD_LINKS
1047         if (preserve_hard_links && flist && flist->prev) {
1048                 if (protocol_version >= 28
1049                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1050                  : S_ISREG(st.st_mode)) {
1051                         tmp_dev = st.st_dev;
1052                         tmp_ino = st.st_ino;
1053                 } else
1054                         tmp_dev = 0;
1055         }
1056 #endif
1057
1058 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1059         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1060                 tmp_rdev = st.st_rdev;
1061                 st.st_size = 0;
1062         }
1063 #endif
1064
1065         file->flags = flags;
1066         file->modtime = st.st_mtime;
1067         file->len32 = (uint32)st.st_size;
1068         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1069                 file->flags |= FLAG_LENGTH64;
1070                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1071         }
1072         file->mode = st.st_mode;
1073         if (preserve_uid)
1074                 F_OWNER(file) = st.st_uid;
1075         if (preserve_gid)
1076                 F_GROUP(file) = st.st_gid;
1077
1078         if (basename != thisname)
1079                 file->dirname = lastdir;
1080
1081 #ifdef SUPPORT_LINKS
1082         if (linkname_len) {
1083                 bp = (char*)file->basename + basename_len;
1084                 memcpy(bp, linkname, linkname_len);
1085         }
1086 #endif
1087
1088         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1089                 file_checksum(thisname, tmp_sum, st.st_size);
1090
1091         F_ROOTDIR(file) = flist_dir;
1092
1093         /* This code is only used by the receiver when it is building
1094          * a list of files for a delete pass. */
1095         if (keep_dirlinks && linkname_len && flist) {
1096                 STRUCT_STAT st2;
1097                 int save_mode = file->mode;
1098                 file->mode = S_IFDIR; /* Find a directory with our name. */
1099                 if (flist_find(dir_flist, file) >= 0
1100                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
1101                         file->modtime = st2.st_mtime;
1102                         file->len32 = 0;
1103                         file->mode = st2.st_mode;
1104                         if (preserve_uid)
1105                                 F_OWNER(file) = st2.st_uid;
1106                         if (preserve_gid)
1107                                 F_GROUP(file) = st2.st_gid;
1108                 } else
1109                         file->mode = save_mode;
1110         }
1111
1112         if (basename_len == 0+1)
1113                 return NULL;
1114
1115         if (inc_recurse && flist == dir_flist) {
1116                 flist_expand(flist);
1117                 flist->files[flist->count++] = file;
1118         }
1119
1120         return file;
1121 }
1122
1123 /* Only called for temporary file_struct entries created by make_file(). */
1124 void unmake_file(struct file_struct *file)
1125 {
1126         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1127 #if EXTRA_ROUNDING > 0
1128         if (extra_cnt & EXTRA_ROUNDING)
1129                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1130 #endif
1131         free(REQ_EXTRA(file, extra_cnt));
1132 }
1133
1134 static struct file_struct *send_file_name(int f, struct file_list *flist,
1135                                           char *fname, STRUCT_STAT *stp,
1136                                           int flags, int filter_flags)
1137 {
1138         struct file_struct *file;
1139 #ifdef SUPPORT_ACLS
1140         statx sx;
1141 #endif
1142
1143         file = make_file(fname, flist, stp, flags, filter_flags);
1144         if (!file)
1145                 return NULL;
1146
1147         if (chmod_modes && !S_ISLNK(file->mode))
1148                 file->mode = tweak_mode(file->mode, chmod_modes);
1149
1150 #ifdef SUPPORT_ACLS
1151         if (preserve_acls && !S_ISLNK(file->mode) && f >= 0) {
1152                 sx.st.st_mode = file->mode;
1153                 sx.acc_acl = sx.def_acl = NULL;
1154                 if (get_acl(fname, &sx) < 0)
1155                         return NULL;
1156         }
1157 #endif
1158
1159         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1160
1161         flist_expand(flist);
1162         flist->files[flist->count++] = file;
1163         if (f >= 0) {
1164                 send_file_entry(f, file, flist->count - 1);
1165 #ifdef SUPPORT_ACLS
1166                 if (preserve_acls && !S_ISLNK(file->mode)) {
1167                         send_acl(&sx, f);
1168                         free_acl(&sx);
1169                 }
1170 #endif
1171         }
1172         return file;
1173 }
1174
1175 static void send_if_directory(int f, struct file_list *flist,
1176                               struct file_struct *file,
1177                               char *fbuf, unsigned int ol,
1178                               int flags)
1179 {
1180         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1181
1182         if (S_ISDIR(file->mode)
1183             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1184                 void *save_filters;
1185                 unsigned int len = strlen(fbuf);
1186                 if (len > 1 && fbuf[len-1] == '/')
1187                         fbuf[--len] = '\0';
1188                 if (len >= MAXPATHLEN - 1) {
1189                         io_error |= IOERR_GENERAL;
1190                         rprintf(FERROR, "skipping long-named directory: %s\n",
1191                                 full_fname(fbuf));
1192                         return;
1193                 }
1194                 save_filters = push_local_filters(fbuf, len);
1195                 send_directory(f, flist, -1, fbuf, len, flags);
1196                 pop_local_filters(save_filters);
1197                 fbuf[ol] = '\0';
1198                 if (is_dot_dir)
1199                         fbuf[ol-1] = '.';
1200         }
1201 }
1202
1203 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1204 {
1205         return f_name_cmp(*file1, *file2);
1206 }
1207
1208 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1209  * sort them by name, and link them into the tree, setting the appropriate
1210  * parent/child/sibling pointers. */
1211 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1212 {
1213         int i;
1214         int32 *dp = NULL;
1215         int32 *parent_dp = parent_ndx < 0 ? NULL
1216                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1217
1218         qsort(dir_flist->files + start, end - start + 1,
1219               sizeof dir_flist->files[0], (int (*)())file_compare);
1220
1221         for (i = start; i <= end; i++) {
1222                 struct file_struct *file = dir_flist->files[i];
1223                 if (!(file->flags & FLAG_XFER_DIR)
1224                  || file->flags & FLAG_MOUNT_DIR)
1225                         continue;
1226                 if (dp)
1227                         DIR_NEXT_SIBLING(dp) = i;
1228                 else if (parent_dp)
1229                         DIR_FIRST_CHILD(parent_dp) = i;
1230                 else
1231                         send_dir_ndx = i;
1232                 dp = F_DIRNODE_P(file);
1233                 DIR_PARENT(dp) = parent_ndx;
1234                 DIR_FIRST_CHILD(dp) = -1;
1235         }
1236         if (dp)
1237                 DIR_NEXT_SIBLING(dp) = -1;
1238 }
1239
1240 /* This function is normally called by the sender, but the receiving side also
1241  * calls it from get_dirlist() with f set to -1 so that we just construct the
1242  * file list in memory without sending it over the wire.  Also, get_dirlist()
1243  * might call this with f set to -2, which also indicates that local filter
1244  * rules should be ignored. */
1245 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1246                            char *fbuf, int len, int flags)
1247 {
1248         struct dirent *di;
1249         unsigned remainder;
1250         char *p;
1251         DIR *d;
1252         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1253         int start = divert_dirs ? dir_flist->count : flist->count;
1254         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1255
1256         assert(flist != NULL);
1257
1258         if (!(d = opendir(fbuf))) {
1259                 io_error |= IOERR_GENERAL;
1260                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1261                 return;
1262         }
1263
1264         p = fbuf + len;
1265         if (len != 1 || *fbuf != '/')
1266                 *p++ = '/';
1267         *p = '\0';
1268         remainder = MAXPATHLEN - (p - fbuf);
1269
1270         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1271                 char *dname = d_name(di);
1272                 if (dname[0] == '.' && (dname[1] == '\0'
1273                     || (dname[1] == '.' && dname[2] == '\0')))
1274                         continue;
1275                 if (strlcpy(p, dname, remainder) >= remainder) {
1276                         io_error |= IOERR_GENERAL;
1277                         rprintf(FINFO,
1278                                 "cannot send long-named file %s\n",
1279                                 full_fname(fbuf));
1280                         continue;
1281                 }
1282
1283                 send_file_name(f, flist, fbuf, NULL, flags, filter_flags);
1284         }
1285
1286         fbuf[len] = '\0';
1287
1288         if (errno) {
1289                 io_error |= IOERR_GENERAL;
1290                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1291         }
1292
1293         closedir(d);
1294
1295         if (f < 0)
1296                 return;
1297
1298         if (divert_dirs)
1299                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1300         else if (recurse) {
1301                 int i, end = flist->count - 1;
1302                 /* send_if_directory() bumps flist->count, so use "end". */
1303                 for (i = start; i <= end; i++)
1304                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1305         }
1306 }
1307
1308 void send_extra_file_list(int f, int at_least)
1309 {
1310         char fbuf[MAXPATHLEN];
1311         struct file_list *flist;
1312         int64 start_write;
1313         int future_cnt, save_io_error = io_error;
1314
1315         if (send_dir_ndx < 0)
1316                 return;
1317
1318         /* Keep sending data until we have the requested number of
1319          * files in the upcoming file-lists. */
1320         if (cur_flist->next) {
1321                 flist = first_flist->prev; /* the newest flist */
1322                 future_cnt = flist->count
1323                            + flist->ndx_start - cur_flist->next->ndx_start;
1324         } else
1325                 future_cnt = 0;
1326         while (future_cnt < at_least) {
1327                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1328                 int32 *dp;
1329                 int dlen;
1330
1331                 f_name(file, fbuf);
1332                 dlen = strlen(fbuf);
1333
1334                 if (F_ROOTDIR(file) != flist_dir) {
1335                         if (!push_flist_dir(F_ROOTDIR(file), -1))
1336                                 exit_cleanup(RERR_FILESELECT);
1337                 }
1338
1339                 flist = flist_new(0, "send_extra_file_list");
1340                 start_write = stats.total_written;
1341
1342                 write_ndx(f, NDX_FLIST_OFFSET - send_dir_ndx);
1343                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1344                 send_directory(f, flist, send_dir_ndx, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1345                 write_byte(f, 0);
1346
1347                 clean_flist(flist, 0, 0);
1348                 file_total += flist->count;
1349                 future_cnt += flist->count;
1350                 stats.flist_size += stats.total_written - start_write;
1351                 stats.num_files += flist->count;
1352                 if (verbose > 3)
1353                         output_flist(flist);
1354
1355                 dp = F_DIRNODE_P(file);
1356                 if (DIR_FIRST_CHILD(dp) >= 0) {
1357                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1358                         send_dir_depth++;
1359                 } else {
1360                         while (DIR_NEXT_SIBLING(dp) < 0) {
1361                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1362                                         write_ndx(f, NDX_FLIST_EOF);
1363                                         flist_eof = 1;
1364                                         change_local_filter_dir(NULL, 0, 0);
1365                                         goto finish;
1366                                 }
1367                                 send_dir_depth--;
1368                                 file = dir_flist->files[send_dir_ndx];
1369                                 dp = F_DIRNODE_P(file);
1370                         }
1371                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1372                 }
1373         }
1374
1375   finish:
1376         if (io_error != save_io_error && !ignore_errors)
1377                 send_msg_int(MSG_IO_ERROR, io_error);
1378 }
1379
1380 struct file_list *send_file_list(int f, int argc, char *argv[])
1381 {
1382         int len;
1383         STRUCT_STAT st;
1384         char *p, *dir;
1385         char lastpath[MAXPATHLEN] = "";
1386         struct file_list *flist;
1387         struct timeval start_tv, end_tv;
1388         int64 start_write;
1389         int use_ff_fd = 0;
1390         int flags, disable_buffering;
1391
1392         rprintf(FLOG, "building file list\n");
1393         if (show_filelist_p())
1394                 start_filelist_progress("building file list");
1395         else if (inc_recurse && verbose && !am_server)
1396                 rprintf(FCLIENT, "sending incremental file list\n");
1397
1398         start_write = stats.total_written;
1399         gettimeofday(&start_tv, NULL);
1400
1401 #ifdef SUPPORT_HARD_LINKS
1402         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1403                 init_hard_links();
1404 #endif
1405
1406         flist = cur_flist = flist_new(0, "send_file_list");
1407         if (inc_recurse) {
1408                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1409                 flags = FLAG_DIVERT_DIRS;
1410         } else {
1411                 dir_flist = cur_flist;
1412                 flags = 0;
1413         }
1414
1415         disable_buffering = io_start_buffering_out(f);
1416         if (filesfrom_fd >= 0) {
1417                 if (argv[0] && !push_dir(argv[0], 0)) {
1418                         rsyserr(FERROR, errno, "push_dir %s failed",
1419                                 full_fname(argv[0]));
1420                         exit_cleanup(RERR_FILESELECT);
1421                 }
1422                 use_ff_fd = 1;
1423         }
1424
1425         while (1) {
1426                 char fbuf[MAXPATHLEN];
1427                 char *fn;
1428                 int is_dot_dir;
1429
1430                 if (use_ff_fd) {
1431                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1432                                 break;
1433                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1434                 } else {
1435                         if (argc-- == 0)
1436                                 break;
1437                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1438                         if (sanitize_paths)
1439                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1440                 }
1441
1442                 len = strlen(fbuf);
1443                 if (relative_paths) {
1444                         /* We clean up fbuf below. */
1445                         is_dot_dir = 0;
1446                 } else if (!len || fbuf[len - 1] == '/') {
1447                         if (len == 2 && fbuf[0] == '.') {
1448                                 /* Turn "./" into just "." rather than "./." */
1449                                 fbuf[1] = '\0';
1450                         } else {
1451                                 if (len + 1 >= MAXPATHLEN)
1452                                         overflow_exit("send_file_list");
1453                                 fbuf[len++] = '.';
1454                                 fbuf[len] = '\0';
1455                         }
1456                         is_dot_dir = 1;
1457                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1458                     && (len == 2 || fbuf[len-3] == '/')) {
1459                         if (len + 2 >= MAXPATHLEN)
1460                                 overflow_exit("send_file_list");
1461                         fbuf[len++] = '/';
1462                         fbuf[len++] = '.';
1463                         fbuf[len] = '\0';
1464                         is_dot_dir = 1;
1465                 } else {
1466                         is_dot_dir = fbuf[len-1] == '.'
1467                                    && (len == 1 || fbuf[len-2] == '/');
1468                 }
1469
1470                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1471                         io_error |= IOERR_GENERAL;
1472                         rsyserr(FERROR, errno, "link_stat %s failed",
1473                                 full_fname(fbuf));
1474                         continue;
1475                 }
1476
1477                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1478                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1479                         continue;
1480                 }
1481
1482                 dir = NULL;
1483
1484                 if (!relative_paths) {
1485                         p = strrchr(fbuf, '/');
1486                         if (p) {
1487                                 *p = '\0';
1488                                 if (p == fbuf)
1489                                         dir = "/";
1490                                 else
1491                                         dir = fbuf;
1492                                 len -= p - fbuf + 1;
1493                                 fn = p + 1;
1494                         } else
1495                                 fn = fbuf;
1496                 } else {
1497                         if ((p = strstr(fbuf, "/./")) != NULL) {
1498                                 *p = '\0';
1499                                 if (p == fbuf)
1500                                         dir = "/";
1501                                 else
1502                                         dir = fbuf;
1503                                 len -= p - fbuf + 3;
1504                                 fn = p + 3;
1505                         } else
1506                                 fn = fbuf;
1507                         /* Get rid of trailing "/" and "/.". */
1508                         while (len) {
1509                                 if (fn[len - 1] == '/') {
1510                                         is_dot_dir = 1;
1511                                         if (!--len && !dir) {
1512                                                 len++;
1513                                                 break;
1514                                         }
1515                                 }
1516                                 else if (len >= 2 && fn[len - 1] == '.'
1517                                                   && fn[len - 2] == '/') {
1518                                         is_dot_dir = 1;
1519                                         if (!(len -= 2) && !dir) {
1520                                                 len++;
1521                                                 break;
1522                                         }
1523                                 } else
1524                                         break;
1525                         }
1526                         if (len == 1 && fn[0] == '/')
1527                                 fn[len++] = '.';
1528                         fn[len] = '\0';
1529                         /* Reject a ".." dir in the active part of the path. */
1530                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1531                                 if ((p[2] == '/' || p[2] == '\0')
1532                                  && (p == fn || p[-1] == '/')) {
1533                                         rprintf(FERROR,
1534                                             "found \"..\" dir in relative path: %s\n",
1535                                             fbuf);
1536                                         exit_cleanup(RERR_SYNTAX);
1537                                 }
1538                         }
1539                 }
1540
1541                 if (!*fn) {
1542                         len = 1;
1543                         fn = ".";
1544                 }
1545
1546                 if (dir && *dir) {
1547                         static const char *lastdir;
1548                         static int lastdir_len = -1;
1549                         int len = strlen(dir);
1550
1551                         if (len != lastdir_len || memcmp(lastdir, dir, len) != 0) {
1552                                 if (!push_flist_dir(strdup(dir), len))
1553                                         goto push_error;
1554                                 lastdir = flist_dir;
1555                                 lastdir_len = flist_dir_len;
1556                         } else if (!push_flist_dir(lastdir, lastdir_len)) {
1557                           push_error:
1558                                 io_error |= IOERR_GENERAL;
1559                                 rsyserr(FERROR, errno, "push_dir %s failed",
1560                                         full_fname(dir));
1561                                 continue;
1562                         }
1563                 }
1564
1565                 if (fn != fbuf)
1566                         memmove(fbuf, fn, len + 1);
1567
1568                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1569                         /* Send the implied directories at the start of the
1570                          * source spec, so we get their permissions right. */
1571                         char *lp = lastpath, *slash = fbuf;
1572                         *p = '\0';
1573                         /* Skip any initial directories in our path that we
1574                          * have in common with lastpath. */
1575                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1576                                 if (*fn == '/')
1577                                         slash = fn;
1578                         }
1579                         *p = '/';
1580                         if (fn != p || (*lp && *lp != '/')) {
1581                                 int save_copy_links = copy_links;
1582                                 int save_xfer_dirs = xfer_dirs;
1583                                 int dir_flags = inc_recurse ? FLAG_DIVERT_DIRS : 0;
1584                                 copy_links |= copy_unsafe_links;
1585                                 xfer_dirs = 1;
1586                                 while ((slash = strchr(slash+1, '/')) != 0) {
1587                                         *slash = '\0';
1588                                         send_file_name(f, flist, fbuf, NULL,
1589                                                        dir_flags, ALL_FILTERS);
1590                                         *slash = '/';
1591                                 }
1592                                 copy_links = save_copy_links;
1593                                 xfer_dirs = save_xfer_dirs;
1594                                 *p = '\0';
1595                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1596                                 *p = '/';
1597                         }
1598                 }
1599
1600                 if (one_file_system)
1601                         filesystem_dev = st.st_dev;
1602
1603                 if (recurse || (xfer_dirs && is_dot_dir)) {
1604                         struct file_struct *file;
1605                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR
1606                                       | (is_dot_dir ? 0 : flags)
1607                                       | (inc_recurse ? FLAG_DIVERT_DIRS : 0);
1608                         file = send_file_name(f, flist, fbuf, &st,
1609                                               top_flags, ALL_FILTERS);
1610                         if (file && !inc_recurse)
1611                                 send_if_directory(f, flist, file, fbuf, len, flags);
1612                 } else
1613                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1614         }
1615
1616         gettimeofday(&end_tv, NULL);
1617         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1618                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1619         if (stats.flist_buildtime == 0)
1620                 stats.flist_buildtime = 1;
1621         start_tv = end_tv;
1622
1623         write_byte(f, 0); /* Indicate end of file list */
1624
1625 #ifdef SUPPORT_HARD_LINKS
1626         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1627                 idev_destroy();
1628 #endif
1629
1630         if (show_filelist_p())
1631                 finish_filelist_progress(flist);
1632
1633         gettimeofday(&end_tv, NULL);
1634         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1635                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1636
1637         /* Sort the list without removing any duplicates in non-incremental
1638          * mode.  This allows the receiving side to ask for whatever name it
1639          * kept.  For incremental mode, the sender also removes duplicates
1640          * in this initial file-list so that it avoids re-sending duplicated
1641          * directories. */
1642         clean_flist(flist, 0, inc_recurse);
1643         file_total += flist->count;
1644
1645         if (!numeric_ids && !inc_recurse)
1646                 send_uid_list(f);
1647
1648         /* send the io_error flag */
1649         if (protocol_version < 30)
1650                 write_int(f, ignore_errors ? 0 : io_error);
1651         else if (io_error && !ignore_errors)
1652                 send_msg_int(MSG_IO_ERROR, io_error);
1653
1654         if (disable_buffering)
1655                 io_end_buffering_out();
1656
1657         stats.flist_size = stats.total_written - start_write;
1658         stats.num_files = flist->count;
1659
1660         if (verbose > 3)
1661                 output_flist(flist);
1662
1663         if (verbose > 2)
1664                 rprintf(FINFO, "send_file_list done\n");
1665
1666         if (inc_recurse) {
1667                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1668                 if (file_total == 1) {
1669                         /* If we're creating incremental file-lists and there
1670                          * was just 1 item in the first file-list, send 1 more
1671                          * file-list to check if this is a 1-file xfer. */
1672                         if (send_dir_ndx < 0)
1673                                 write_ndx(f, NDX_DONE);
1674                         else
1675                                 send_extra_file_list(f, 1);
1676                 }
1677         }
1678
1679         return flist;
1680 }
1681
1682 struct file_list *recv_file_list(int f)
1683 {
1684         struct file_list *flist;
1685         int dstart, flags;
1686         int64 start_read;
1687
1688         if (!first_flist)
1689                 rprintf(FLOG, "receiving file list\n");
1690         if (show_filelist_p())
1691                 start_filelist_progress("receiving file list");
1692         else if (inc_recurse && verbose && !am_server && !first_flist)
1693                 rprintf(FCLIENT, "receiving incremental file list\n");
1694
1695         start_read = stats.total_read;
1696
1697         flist = flist_new(0, "recv_file_list");
1698
1699 #ifdef SUPPORT_HARD_LINKS
1700         if (preserve_hard_links && protocol_version < 30)
1701                 init_hard_links();
1702 #endif
1703
1704         if (inc_recurse) {
1705                 if (flist->ndx_start == 0)
1706                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1707                 dstart = dir_flist->count;
1708         } else {
1709                 dir_flist = flist;
1710                 dstart = 0;
1711         }
1712
1713         while ((flags = read_byte(f)) != 0) {
1714                 struct file_struct *file;
1715
1716                 flist_expand(flist);
1717
1718                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1719                         flags |= read_byte(f) << 8;
1720                 file = recv_file_entry(flist, flags, f);
1721
1722                 if (inc_recurse && S_ISDIR(file->mode)) {
1723                         flist_expand(dir_flist);
1724                         dir_flist->files[dir_flist->count++] = file;
1725                 }
1726
1727                 flist->files[flist->count++] = file;
1728
1729                 maybe_emit_filelist_progress(flist->count);
1730
1731                 if (verbose > 2) {
1732                         rprintf(FINFO, "recv_file_name(%s)\n",
1733                                 f_name(file, NULL));
1734                 }
1735         }
1736         file_total += flist->count;
1737
1738         if (verbose > 2)
1739                 rprintf(FINFO, "received %d names\n", flist->count);
1740
1741         if (show_filelist_p())
1742                 finish_filelist_progress(flist);
1743
1744         clean_flist(flist, relative_paths, 1);
1745
1746         if (inc_recurse) {
1747                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1748                       sizeof dir_flist->files[0], (int (*)())file_compare);
1749         } else if (f >= 0)
1750                 recv_uid_list(f, flist);
1751
1752         if (protocol_version < 30) {
1753                 /* Recv the io_error flag */
1754                 if (ignore_errors)
1755                         read_int(f);
1756                 else
1757                         io_error |= read_int(f);
1758         }
1759
1760         if (verbose > 3)
1761                 output_flist(flist);
1762
1763         if (list_only) {
1764                 int i;
1765                 for (i = 0; i < flist->count; i++)
1766                         list_file_entry(flist->files[i]);
1767         }
1768
1769         if (verbose > 2)
1770                 rprintf(FINFO, "recv_file_list done\n");
1771
1772         stats.flist_size += stats.total_read - start_read;
1773         stats.num_files += flist->count;
1774
1775         return flist;
1776 }
1777
1778 /* This is only used once by the receiver if the very first file-list
1779  * has exactly one item in it. */
1780 void recv_additional_file_list(int f)
1781 {
1782         struct file_list *flist;
1783         int ndx = read_ndx(f);
1784         if (ndx == NDX_DONE) {
1785                 flist_eof = 1;
1786                 change_local_filter_dir(NULL, 0, 0);
1787         } else {
1788                 ndx = NDX_FLIST_OFFSET - ndx;
1789                 if (ndx < 0 || ndx >= dir_flist->count) {
1790                         ndx = NDX_FLIST_OFFSET - ndx;
1791                         rprintf(FERROR,
1792                                 "Invalid dir index: %d (%d - %d)\n",
1793                                 ndx, NDX_FLIST_OFFSET,
1794                                 NDX_FLIST_OFFSET - dir_flist->count);
1795                         exit_cleanup(RERR_PROTOCOL);
1796                 }
1797                 flist = recv_file_list(f);
1798                 flist->parent_ndx = ndx;
1799         }
1800 }
1801
1802 /* Search for an identically-named item in the file list.  Note that the
1803  * items must agree in their directory-ness, or no match is returned. */
1804 int flist_find(struct file_list *flist, struct file_struct *f)
1805 {
1806         int low = flist->low, high = flist->high;
1807         int diff, mid, mid_up;
1808
1809         while (low <= high) {
1810                 mid = (low + high) / 2;
1811                 if (F_IS_ACTIVE(flist->files[mid]))
1812                         mid_up = mid;
1813                 else {
1814                         /* Scan for the next non-empty entry using the cached
1815                          * distance values.  If the value isn't fully up-to-
1816                          * date, update it. */
1817                         mid_up = mid + F_DEPTH(flist->files[mid]);
1818                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1819                                 do {
1820                                     mid_up += F_DEPTH(flist->files[mid_up]);
1821                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1822                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1823                         }
1824                         if (mid_up > high) {
1825                                 /* If there's nothing left above us, set high to
1826                                  * a non-empty entry below us and continue. */
1827                                 high = mid - (int)flist->files[mid]->len32;
1828                                 if (!F_IS_ACTIVE(flist->files[high])) {
1829                                         do {
1830                                             high -= (int)flist->files[high]->len32;
1831                                         } while (!F_IS_ACTIVE(flist->files[high]));
1832                                         flist->files[mid]->len32 = mid - high;
1833                                 }
1834                                 continue;
1835                         }
1836                 }
1837                 diff = f_name_cmp(flist->files[mid_up], f);
1838                 if (diff == 0) {
1839                         if (protocol_version < 29
1840                             && S_ISDIR(flist->files[mid_up]->mode)
1841                             != S_ISDIR(f->mode))
1842                                 return -1;
1843                         return mid_up;
1844                 }
1845                 if (diff < 0)
1846                         low = mid_up + 1;
1847                 else
1848                         high = mid - 1;
1849         }
1850         return -1;
1851 }
1852
1853 /*
1854  * Free up any resources a file_struct has allocated
1855  * and clear the file.
1856  */
1857 void clear_file(struct file_struct *file)
1858 {
1859         /* The +1 zeros out the first char of the basename. */
1860         memset(file, 0, FILE_STRUCT_LEN + 1);
1861         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1862          * entry.  Likewise for len32 in the opposite direction.  We assume
1863          * that we're alone for now since flist_find() will adjust the counts
1864          * it runs into that aren't up-to-date. */
1865         file->len32 = F_DEPTH(file) = 1;
1866 }
1867
1868 /* Allocate a new file list. */
1869 struct file_list *flist_new(int flags, char *msg)
1870 {
1871         struct file_list *flist;
1872
1873         flist = new(struct file_list);
1874         if (!flist)
1875                 out_of_memory(msg);
1876
1877         memset(flist, 0, sizeof flist[0]);
1878
1879         if (!(flags & FLIST_TEMP)) {
1880                 if (first_flist) {
1881                         flist->ndx_start = first_flist->prev->ndx_start
1882                                          + first_flist->prev->count;
1883                 }
1884                 /* This is a doubly linked list with prev looping back to
1885                  * the end of the list, but the last next pointer is NULL. */
1886                 if (!first_flist)
1887                         first_flist = cur_flist = flist->prev = flist;
1888                 else {
1889                         flist->prev = first_flist->prev;
1890                         flist->prev->next = first_flist->prev = flist;
1891                 }
1892                 flist_cnt++;
1893         }
1894
1895         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1896                 out_of_memory(msg);
1897
1898         return flist;
1899 }
1900
1901 /* Free up all elements in a flist. */
1902 void flist_free(struct file_list *flist)
1903 {
1904         if (!flist->prev)
1905                 ; /* Was FLIST_TEMP dir-list. */
1906         else if (flist == flist->prev) {
1907                 first_flist = cur_flist = NULL;
1908                 file_total = 0;
1909                 flist_cnt = 0;
1910         } else {
1911                 if (flist == cur_flist)
1912                         cur_flist = flist->next;
1913                 if (flist == first_flist)
1914                         first_flist = first_flist->next;
1915                 else {
1916                         flist->prev->next = flist->next;
1917                         if (!flist->next)
1918                                 flist->next = first_flist;
1919                 }
1920                 flist->next->prev = flist->prev;
1921                 file_total -= flist->count;
1922                 flist_cnt--;
1923         }
1924
1925         pool_destroy(flist->file_pool);
1926         free(flist->files);
1927         free(flist);
1928 }
1929
1930 /*
1931  * This routine ensures we don't have any duplicate names in our file list.
1932  * duplicate names can cause corruption because of the pipelining
1933  */
1934 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1935 {
1936         char fbuf[MAXPATHLEN];
1937         int i, prev_i = 0;
1938
1939         if (!flist)
1940                 return;
1941         if (flist->count == 0) {
1942                 flist->high = -1;
1943                 return;
1944         }
1945
1946         qsort(flist->files, flist->count,
1947             sizeof flist->files[0], (int (*)())file_compare);
1948
1949         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1950                 if (F_IS_ACTIVE(flist->files[i])) {
1951                         prev_i = i;
1952                         break;
1953                 }
1954         }
1955         flist->low = prev_i;
1956         while (++i < flist->count) {
1957                 int j;
1958                 struct file_struct *file = flist->files[i];
1959
1960                 if (!F_IS_ACTIVE(file))
1961                         continue;
1962                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1963                         j = prev_i;
1964                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1965                         int save_mode = file->mode;
1966                         /* Make sure that this directory doesn't duplicate a
1967                          * non-directory earlier in the list. */
1968                         flist->high = prev_i;
1969                         file->mode = S_IFREG;
1970                         j = flist_find(flist, file);
1971                         file->mode = save_mode;
1972                 } else
1973                         j = -1;
1974                 if (j >= 0) {
1975                         struct file_struct *fp = flist->files[j];
1976                         int keep, drop;
1977                         /* If one is a dir and the other is not, we want to
1978                          * keep the dir because it might have contents in the
1979                          * list. */
1980                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1981                                 if (S_ISDIR(file->mode))
1982                                         keep = i, drop = j;
1983                                 else
1984                                         keep = j, drop = i;
1985                         } else if (protocol_version < 27)
1986                                 keep = j, drop = i;
1987                         else
1988                                 keep = i, drop = j;
1989                         if (verbose > 1 && !am_server) {
1990                                 rprintf(FINFO,
1991                                         "removing duplicate name %s from file list (%d)\n",
1992                                         f_name(file, fbuf), drop);
1993                         }
1994                         /* Make sure we don't lose track of a user-specified
1995                          * top directory. */
1996                         flist->files[keep]->flags |= flist->files[drop]->flags
1997                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
1998
1999                         clear_file(flist->files[drop]);
2000
2001                         if (keep == i) {
2002                                 if (flist->low == drop) {
2003                                         for (j = drop + 1;
2004                                              j < i && !F_IS_ACTIVE(flist->files[j]);
2005                                              j++) {}
2006                                         flist->low = j;
2007                                 }
2008                                 prev_i = i;
2009                         }
2010                 } else
2011                         prev_i = i;
2012         }
2013         flist->high = no_dups ? prev_i : flist->count - 1;
2014
2015         if (strip_root) {
2016                 /* We need to strip off the leading slashes for relative
2017                  * paths, but this must be done _after_ the sorting phase. */
2018                 for (i = flist->low; i <= flist->high; i++) {
2019                         struct file_struct *file = flist->files[i];
2020
2021                         if (!file->dirname)
2022                                 continue;
2023                         while (*file->dirname == '/')
2024                                 file->dirname++;
2025                         if (!*file->dirname)
2026                                 file->dirname = NULL;
2027                 }
2028         }
2029
2030         if (prune_empty_dirs && no_dups) {
2031                 int j, prev_depth = 0;
2032
2033                 prev_i = 0; /* It's OK that this isn't really true. */
2034
2035                 for (i = flist->low; i <= flist->high; i++) {
2036                         struct file_struct *fp, *file = flist->files[i];
2037
2038                         /* This temporarily abuses the F_DEPTH() value for a
2039                          * directory that is in a chain that might get pruned.
2040                          * We restore the old value if it gets a reprieve. */
2041                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2042                                 /* Dump empty dirs when coming back down. */
2043                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2044                                         fp = flist->files[prev_i];
2045                                         if (F_DEPTH(fp) >= 0)
2046                                                 break;
2047                                         prev_i = -F_DEPTH(fp)-1;
2048                                         clear_file(fp);
2049                                 }
2050                                 prev_depth = F_DEPTH(file);
2051                                 if (is_excluded(f_name(file, fbuf), 1,
2052                                                        ALL_FILTERS)) {
2053                                         /* Keep dirs through this dir. */
2054                                         for (j = prev_depth-1; ; j--) {
2055                                                 fp = flist->files[prev_i];
2056                                                 if (F_DEPTH(fp) >= 0)
2057                                                         break;
2058                                                 prev_i = -F_DEPTH(fp)-1;
2059                                                 F_DEPTH(fp) = j;
2060                                         }
2061                                 } else
2062                                         F_DEPTH(file) = -prev_i-1;
2063                                 prev_i = i;
2064                         } else {
2065                                 /* Keep dirs through this non-dir. */
2066                                 for (j = prev_depth; ; j--) {
2067                                         fp = flist->files[prev_i];
2068                                         if (F_DEPTH(fp) >= 0)
2069                                                 break;
2070                                         prev_i = -F_DEPTH(fp)-1;
2071                                         F_DEPTH(fp) = j;
2072                                 }
2073                         }
2074                 }
2075                 /* Dump all remaining empty dirs. */
2076                 while (1) {
2077                         struct file_struct *fp = flist->files[prev_i];
2078                         if (F_DEPTH(fp) >= 0)
2079                                 break;
2080                         prev_i = -F_DEPTH(fp)-1;
2081                         clear_file(fp);
2082                 }
2083
2084                 for (i = flist->low; i <= flist->high; i++) {
2085                         if (F_IS_ACTIVE(flist->files[i]))
2086                                 break;
2087                 }
2088                 flist->low = i;
2089                 for (i = flist->high; i >= flist->low; i--) {
2090                         if (F_IS_ACTIVE(flist->files[i]))
2091                                 break;
2092                 }
2093                 flist->high = i;
2094         }
2095 }
2096
2097 static void output_flist(struct file_list *flist)
2098 {
2099         char uidbuf[16], gidbuf[16], depthbuf[16];
2100         struct file_struct *file;
2101         const char *root, *dir, *slash, *name, *trail;
2102         const char *who = who_am_i();
2103         int i;
2104
2105         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2106                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2107         for (i = 0; i < flist->count; i++) {
2108                 file = flist->files[i];
2109                 if ((am_root || am_sender) && preserve_uid) {
2110                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2111                                  (long)F_UID(file));
2112                 } else
2113                         *uidbuf = '\0';
2114                 if (preserve_gid && F_GID(file) != GID_NONE) {
2115                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2116                                  (long)F_GID(file));
2117                 } else
2118                         *gidbuf = '\0';
2119                 if (!am_sender)
2120                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2121                 if (F_IS_ACTIVE(file)) {
2122                         root = am_sender ? NS(F_ROOTDIR(file)) : depthbuf;
2123                         if ((dir = file->dirname) == NULL)
2124                                 dir = slash = "";
2125                         else
2126                                 slash = "/";
2127                         name = file->basename;
2128                         trail = S_ISDIR(file->mode) ? "/" : "";
2129                 } else
2130                         root = dir = slash = name = trail = "";
2131                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2132                         who, i, root, dir, slash, name, trail, (int)file->mode,
2133                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2134         }
2135 }
2136
2137 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2138 enum fnc_type { t_PATH, t_ITEM };
2139
2140 /* Compare the names of two file_struct entities, similar to how strcmp()
2141  * would do if it were operating on the joined strings.
2142  *
2143  * Some differences beginning with protocol_version 29: (1) directory names
2144  * are compared with an assumed trailing slash so that they compare in a
2145  * way that would cause them to sort immediately prior to any content they
2146  * may have; (2) a directory of any name compares after a non-directory of
2147  * any name at the same depth; (3) a directory with name "." compares prior
2148  * to anything else.  These changes mean that a directory and a non-dir
2149  * with the same name will not compare as equal (protocol_version >= 29).
2150  *
2151  * The dirname component can be an empty string, but the basename component
2152  * cannot (and never is in the current codebase).  The basename component
2153  * may be NULL (for a removed item), in which case it is considered to be
2154  * after any existing item. */
2155 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2156 {
2157         int dif;
2158         const uchar *c1, *c2;
2159         enum fnc_state state1, state2;
2160         enum fnc_type type1, type2;
2161         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2162
2163         if (!f1 || !F_IS_ACTIVE(f1)) {
2164                 if (!f2 || !F_IS_ACTIVE(f2))
2165                         return 0;
2166                 return -1;
2167         }
2168         if (!f2 || !F_IS_ACTIVE(f2))
2169                 return 1;
2170
2171         c1 = (uchar*)f1->dirname;
2172         c2 = (uchar*)f2->dirname;
2173         if (c1 == c2)
2174                 c1 = c2 = NULL;
2175         if (!c1) {
2176                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2177                 c1 = (const uchar*)f1->basename;
2178                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2179                         type1 = t_ITEM;
2180                         state1 = s_TRAILING;
2181                         c1 = (uchar*)"";
2182                 } else
2183                         state1 = s_BASE;
2184         } else {
2185                 type1 = t_path;
2186                 state1 = s_DIR;
2187         }
2188         if (!c2) {
2189                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2190                 c2 = (const uchar*)f2->basename;
2191                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2192                         type2 = t_ITEM;
2193                         state2 = s_TRAILING;
2194                         c2 = (uchar*)"";
2195                 } else
2196                         state2 = s_BASE;
2197         } else {
2198                 type2 = t_path;
2199                 state2 = s_DIR;
2200         }
2201
2202         if (type1 != type2)
2203                 return type1 == t_PATH ? 1 : -1;
2204
2205         do {
2206                 if (!*c1) {
2207                         switch (state1) {
2208                         case s_DIR:
2209                                 state1 = s_SLASH;
2210                                 c1 = (uchar*)"/";
2211                                 break;
2212                         case s_SLASH:
2213                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2214                                 c1 = (const uchar*)f1->basename;
2215                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2216                                         type1 = t_ITEM;
2217                                         state1 = s_TRAILING;
2218                                         c1 = (uchar*)"";
2219                                 } else
2220                                         state1 = s_BASE;
2221                                 break;
2222                         case s_BASE:
2223                                 state1 = s_TRAILING;
2224                                 if (type1 == t_PATH) {
2225                                         c1 = (uchar*)"/";
2226                                         break;
2227                                 }
2228                                 /* FALL THROUGH */
2229                         case s_TRAILING:
2230                                 type1 = t_ITEM;
2231                                 break;
2232                         }
2233                         if (*c2 && type1 != type2)
2234                                 return type1 == t_PATH ? 1 : -1;
2235                 }
2236                 if (!*c2) {
2237                         switch (state2) {
2238                         case s_DIR:
2239                                 state2 = s_SLASH;
2240                                 c2 = (uchar*)"/";
2241                                 break;
2242                         case s_SLASH:
2243                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2244                                 c2 = (const uchar*)f2->basename;
2245                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2246                                         type2 = t_ITEM;
2247                                         state2 = s_TRAILING;
2248                                         c2 = (uchar*)"";
2249                                 } else
2250                                         state2 = s_BASE;
2251                                 break;
2252                         case s_BASE:
2253                                 state2 = s_TRAILING;
2254                                 if (type2 == t_PATH) {
2255                                         c2 = (uchar*)"/";
2256                                         break;
2257                                 }
2258                                 /* FALL THROUGH */
2259                         case s_TRAILING:
2260                                 if (!*c1)
2261                                         return 0;
2262                                 type2 = t_ITEM;
2263                                 break;
2264                         }
2265                         if (type1 != type2)
2266                                 return type1 == t_PATH ? 1 : -1;
2267                 }
2268         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2269
2270         return dif;
2271 }
2272
2273 char *f_name_buf(void)
2274 {
2275         static char names[5][MAXPATHLEN];
2276         static unsigned int n;
2277
2278         n = (n + 1) % (sizeof names / sizeof names[0]);
2279
2280         return names[n];
2281 }
2282
2283 /* Return a copy of the full filename of a flist entry, using the indicated
2284  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2285  * done because we checked the size when creating the file_struct entry.
2286  */
2287 char *f_name(struct file_struct *f, char *fbuf)
2288 {
2289         if (!f || !F_IS_ACTIVE(f))
2290                 return NULL;
2291
2292         if (!fbuf)
2293                 fbuf = f_name_buf();
2294
2295         if (f->dirname) {
2296                 int len = strlen(f->dirname);
2297                 memcpy(fbuf, f->dirname, len);
2298                 fbuf[len] = '/';
2299                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2300         } else
2301                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2302
2303         return fbuf;
2304 }
2305
2306 /* Do a non-recursive scan of the named directory, possibly ignoring all
2307  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2308  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2309  * buffer (the functions we call will append names onto the end, but the old
2310  * dir value will be restored on exit). */
2311 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2312 {
2313         struct file_list *dirlist;
2314         char dirbuf[MAXPATHLEN];
2315         int save_recurse = recurse;
2316         int save_xfer_dirs = xfer_dirs;
2317
2318         if (dlen < 0) {
2319                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2320                 if (dlen >= MAXPATHLEN)
2321                         return NULL;
2322                 dirname = dirbuf;
2323         }
2324
2325         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2326
2327         recurse = 0;
2328         xfer_dirs = 1;
2329         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2330         xfer_dirs = save_xfer_dirs;
2331         recurse = save_recurse;
2332         if (do_progress)
2333                 flist_count_offset += dirlist->count;
2334
2335         clean_flist(dirlist, 0, 0);
2336
2337         if (verbose > 3)
2338                 output_flist(dirlist);
2339
2340         return dirlist;
2341 }