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 #include "io.h"
  26
  27 extern int verbose;
  28 extern int list_only;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int am_generator;
  34 extern int inc_recurse;
  35 extern int do_progress;
  36 extern int always_checksum;
  37 extern int module_id;
  38 extern int ignore_errors;
  39 extern int numeric_ids;
  40 extern int recurse;
  41 extern int xfer_dirs;
  42 extern int filesfrom_fd;
  43 extern int one_file_system;
  44 extern int copy_dirlinks;
  45 extern int keep_dirlinks;
  46 extern int preserve_acls;
  47 extern int preserve_xattrs;
  48 extern int preserve_links;
  49 extern int preserve_hard_links;
  50 extern int preserve_devices;
  51 extern int preserve_specials;
  52 extern int preserve_uid;
  53 extern int preserve_gid;
  54 extern int relative_paths;
  55 extern int implied_dirs;
  56 extern int file_extra_cnt;
  57 extern int ignore_perishable;
  58 extern int non_perishable_cnt;
  59 extern int prune_empty_dirs;
  60 extern int copy_links;
  61 extern int copy_unsafe_links;
  62 extern int protocol_version;
  63 extern int sanitize_paths;
  64 extern struct stats stats;
  65
  66 extern char curr_dir[MAXPATHLEN];
  67
  68 extern struct chmod_mode_struct *chmod_modes;
  69
  70 extern struct filter_list_struct filter_list;
  71 extern struct filter_list_struct server_filter_list;
  72
  73 int io_error;
  74 int checksum_len;
  75 dev_t filesystem_dev; /* used to implement -x */
  76
  77 struct file_list *cur_flist, *first_flist, *dir_flist;
  78 int send_dir_ndx = -1, send_dir_depth = 0;
  79 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  80 int file_total = 0; /* total of all active items over all file-lists */
  81 int flist_eof = 0; /* all the file-lists are now known */
  82
  83 /* The tmp_* vars are used as a cache area by make_file() to store data
  84  * that the sender doesn't need to remember in its file list.  The data
  85  * will survive just long enough to be used by send_file_entry(). */
  86 static dev_t tmp_rdev;
  87 #ifdef SUPPORT_HARD_LINKS
  88 static int64 tmp_dev, tmp_ino;
  89 #endif
  90 static char tmp_sum[MAX_DIGEST_LEN];
  91
  92 static char empty_sum[MAX_DIGEST_LEN];
  93 static int flist_count_offset; /* for --delete --progress */
  94
  95 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  96 static void output_flist(struct file_list *flist);
  97
  98 void init_flist(void)
  99 {
 100         if (verbose > 4) {
 101                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 102                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 103         }
 104         checksum_len = protocol_version < 21 ? 2
 105                      : protocol_version < 30 ? MD4_DIGEST_LEN
 106                      : MD5_DIGEST_LEN;
 107 }
 108
 109 static int show_filelist_p(void)
 110 {
 111         return verbose && xfer_dirs && !am_server && !inc_recurse;
 112 }
 113
 114 static void start_filelist_progress(char *kind)
 115 {
 116         rprintf(FCLIENT, "%s ... ", kind);
 117         if (verbose > 1 || do_progress)
 118                 rprintf(FCLIENT, "\n");
 119         rflush(FINFO);
 120 }
 121
 122 static void emit_filelist_progress(int count)
 123 {
 124         rprintf(FCLIENT, " %d files...\r", count);
 125 }
 126
 127 static void maybe_emit_filelist_progress(int count)
 128 {
 129         if (do_progress && show_filelist_p() && (count % 100) == 0)
 130                 emit_filelist_progress(count);
 131 }
 132
 133 static void finish_filelist_progress(const struct file_list *flist)
 134 {
 135         if (do_progress) {
 136                 /* This overwrites the progress line */
 137                 rprintf(FINFO, "%d file%sto consider\n",
 138                         flist->count, flist->count == 1 ? " " : "s ");
 139         } else
 140                 rprintf(FINFO, "done\n");
 141 }
 142
 143 void show_flist_stats(void)
 144 {
 145         /* Nothing yet */
 146 }
 147
 148 static void list_file_entry(struct file_struct *f)
 149 {
 150         char permbuf[PERMSTRING_SIZE];
 151         double len;
 152
 153         if (!F_IS_ACTIVE(f)) {
 154                 /* this can happen if duplicate names were removed */
 155                 return;
 156         }
 157
 158         permstring(permbuf, f->mode);
 159         len = F_LENGTH(f);
 160
 161         /* TODO: indicate '+' if the entry has an ACL. */
 162
 163 #ifdef SUPPORT_LINKS
 164         if (preserve_links && S_ISLNK(f->mode)) {
 165                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 166                         permbuf, len, timestring(f->modtime),
 167                         f_name(f, NULL), F_SYMLINK(f));
 168         } else
 169 #endif
 170         {
 171                 rprintf(FINFO, "%s %11.0f %s %s\n",
 172                         permbuf, len, timestring(f->modtime),
 173                         f_name(f, NULL));
 174         }
 175 }
 176
 177 /* Stat either a symlink or its referent, depending on the settings of
 178  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 179  *
 180  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 181  * MAXPATHLEN chars) will be set to the symlink's target string.
 182  *
 183  * The stat structure pointed to by stp will contain information about the
 184  * link or the referent as appropriate, if they exist. */
 185 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 186 {
 187 #ifdef SUPPORT_LINKS
 188         if (link_stat(path, stp, copy_dirlinks) < 0)
 189                 return -1;
 190         if (S_ISLNK(stp->st_mode)) {
 191                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 192                 if (llen < 0)
 193                         return -1;
 194                 linkbuf[llen] = '\0';
 195                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 196                         if (verbose > 1) {
 197                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 198                                         path, linkbuf);
 199                         }
 200                         return x_stat(path, stp, NULL);
 201                 }
 202         }
 203         return 0;
 204 #else
 205         return x_stat(path, stp, NULL);
 206 #endif
 207 }
 208
 209 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 210 {
 211 #ifdef SUPPORT_LINKS
 212         if (copy_links)
 213                 return x_stat(path, stp, NULL);
 214         if (x_lstat(path, stp, NULL) < 0)
 215                 return -1;
 216         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 217                 STRUCT_STAT st;
 218                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 219                         *stp = st;
 220         }
 221         return 0;
 222 #else
 223         return x_stat(path, stp, NULL);
 224 #endif
 225 }
 226
 227 /* This function is used to check if a file should be included/excluded
 228  * from the list of files based on its name and type etc.  The value of
 229  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 230 static int is_excluded(char *fname, int is_dir, int filter_level)
 231 {
 232 #if 0 /* This currently never happens, so avoid a useless compare. */
 233         if (filter_level == NO_FILTERS)
 234                 return 0;
 235 #endif
 236         if (fname) {
 237                 /* never exclude '.', even if somebody does --exclude '*' */
 238                 if (fname[0] == '.' && !fname[1])
 239                         return 0;
 240                 /* Handle the -R version of the '.' dir. */
 241                 if (fname[0] == '/') {
 242                         int len = strlen(fname);
 243                         if (fname[len-1] == '.' && fname[len-2] == '/')
 244                                 return 0;
 245                 }
 246         }
 247         if (server_filter_list.head
 248             && check_filter(&server_filter_list, fname, is_dir) < 0)
 249                 return 1;
 250         if (filter_level != ALL_FILTERS)
 251                 return 0;
 252         if (filter_list.head
 253             && check_filter(&filter_list, fname, is_dir) < 0)
 254                 return 1;
 255         return 0;
 256 }
 257
 258 static void send_directory(int f, struct file_list *flist, int ndx,
 259                            char *fbuf, int len, int flags);
 260
 261 static const char *pathname, *orig_dir;
 262 static int pathname_len;
 263
 264
 265 /**
 266  * Make sure @p flist is big enough to hold at least @p flist->count
 267  * entries.
 268  **/
 269 void flist_expand(struct file_list *flist)
 270 {
 271         struct file_struct **new_ptr;
 272
 273         if (flist->count < flist->malloced)
 274                 return;
 275
 276         if (flist->malloced < FLIST_START)
 277                 flist->malloced = FLIST_START;
 278         else if (flist->malloced >= FLIST_LINEAR)
 279                 flist->malloced += FLIST_LINEAR;
 280         else
 281                 flist->malloced *= 2;
 282
 283         /*
 284          * In case count jumped or we are starting the list
 285          * with a known size just set it.
 286          */
 287         if (flist->malloced < flist->count)
 288                 flist->malloced = flist->count;
 289
 290         new_ptr = realloc_array(flist->files, struct file_struct *,
 291                                 flist->malloced);
 292
 293         if (verbose >= 2 && flist->malloced != FLIST_START) {
 294                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
 295                     who_am_i(),
 296                     (double)sizeof flist->files[0] * flist->malloced,
 297                     (new_ptr == flist->files) ? " not" : "");
 298         }
 299
 300         flist->files = new_ptr;
 301
 302         if (!flist->files)
 303                 out_of_memory("flist_expand");
 304 }
 305
 306 int push_pathname(const char *dir, int len)
 307 {
 308         if (dir == pathname)
 309                 return 1;
 310
 311         if (!orig_dir)
 312                 orig_dir = strdup(curr_dir);
 313
 314         if (pathname && !pop_dir(orig_dir)) {
 315                 rsyserr(FERROR, errno, "pop_dir %s failed",
 316                         full_fname(orig_dir));
 317                 exit_cleanup(RERR_FILESELECT);
 318         }
 319
 320         if (dir && !push_dir(dir, 0)) {
 321                 io_error |= IOERR_GENERAL;
 322                 rsyserr(FERROR, errno, "push_dir %s failed in %s",
 323                         full_fname(dir), curr_dir);
 324                 return 0;
 325         }
 326
 327         pathname = dir;
 328         pathname_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 329
 330         return 1;
 331 }
 332
 333 static void send_file_entry(int f, struct file_struct *file, int ndx)
 334 {
 335         static time_t modtime;
 336         static mode_t mode;
 337         static int64 dev;
 338         static dev_t rdev;
 339         static uint32 rdev_major;
 340         static uid_t uid;
 341         static gid_t gid;
 342         static char *user_name, *group_name;
 343         static char lastname[MAXPATHLEN];
 344         char fname[MAXPATHLEN];
 345         int first_hlink_ndx = -1;
 346         int l1, l2;
 347         int flags;
 348
 349         f_name(file, fname);
 350
 351         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 352
 353         if (file->mode == mode)
 354                 flags |= XMIT_SAME_MODE;
 355         else
 356                 mode = file->mode;
 357         if ((preserve_devices && IS_DEVICE(mode))
 358          || (preserve_specials && IS_SPECIAL(mode))) {
 359                 if (protocol_version < 28) {
 360                         if (tmp_rdev == rdev)
 361                                 flags |= XMIT_SAME_RDEV_pre28;
 362                         else
 363                                 rdev = tmp_rdev;
 364                 } else {
 365                         rdev = tmp_rdev;
 366                         if ((uint32)major(rdev) == rdev_major)
 367                                 flags |= XMIT_SAME_RDEV_MAJOR;
 368                         else
 369                                 rdev_major = major(rdev);
 370                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 371                                 flags |= XMIT_RDEV_MINOR_8_pre30;
 372                 }
 373         } else if (protocol_version < 28)
 374                 rdev = MAKEDEV(0, 0);
 375         if (preserve_uid) {
 376                 if (F_UID(file) == uid && *lastname)
 377                         flags |= XMIT_SAME_UID;
 378                 else {
 379                         uid = F_UID(file);
 380                         if (preserve_uid && !numeric_ids) {
 381                                 user_name = add_uid(uid);
 382                                 if (inc_recurse && user_name)
 383                                         flags |= XMIT_USER_NAME_FOLLOWS;
 384                         }
 385                 }
 386         }
 387         if (preserve_gid) {
 388                 if (F_GID(file) == gid && *lastname)
 389                         flags |= XMIT_SAME_GID;
 390                 else {
 391                         gid = F_GID(file);
 392                         if (preserve_gid && !numeric_ids) {
 393                                 group_name = add_gid(gid);
 394                                 if (inc_recurse && group_name)
 395                                         flags |= XMIT_GROUP_NAME_FOLLOWS;
 396                         }
 397                 }
 398         }
 399         if (file->modtime == modtime)
 400                 flags |= XMIT_SAME_TIME;
 401         else
 402                 modtime = file->modtime;
 403
 404 #ifdef SUPPORT_HARD_LINKS
 405         if (tmp_dev != 0) {
 406                 if (protocol_version >= 30) {
 407                         struct idev_node *np = idev_node(tmp_dev, tmp_ino);
 408                         first_hlink_ndx = (int32)(long)np->data - 1;
 409                         if (first_hlink_ndx < 0) {
 410                                 np->data = (void*)(long)(ndx + 1);
 411                                 flags |= XMIT_HLINK_FIRST;
 412                         }
 413                         flags |= XMIT_HLINKED;
 414                 } else {
 415                         if (tmp_dev == dev) {
 416                                 if (protocol_version >= 28)
 417                                         flags |= XMIT_SAME_DEV_pre30;
 418                         } else
 419                                 dev = tmp_dev;
 420                         flags |= XMIT_HLINKED;
 421                 }
 422         }
 423 #endif
 424
 425         for (l1 = 0;
 426             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 427             l1++) {}
 428         l2 = strlen(fname+l1);
 429
 430         if (l1 > 0)
 431                 flags |= XMIT_SAME_NAME;
 432         if (l2 > 255)
 433                 flags |= XMIT_LONG_NAME;
 434
 435         /* We must make sure we don't send a zero flag byte or the
 436          * other end will terminate the flist transfer.  Note that
 437          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 438          * it's harmless way to add a bit to the first flag byte. */
 439         if (protocol_version >= 28) {
 440                 if (!flags && !S_ISDIR(mode))
 441                         flags |= XMIT_TOP_DIR;
 442                 if ((flags & 0xFF00) || !flags) {
 443                         flags |= XMIT_EXTENDED_FLAGS;
 444                         write_shortint(f, flags);
 445                 } else
 446                         write_byte(f, flags);
 447         } else {
 448                 if (!(flags & 0xFF))
 449                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 450                 write_byte(f, flags);
 451         }
 452         if (flags & XMIT_SAME_NAME)
 453                 write_byte(f, l1);
 454         if (flags & XMIT_LONG_NAME)
 455                 write_varint30(f, l2);
 456         else
 457                 write_byte(f, l2);
 458         write_buf(f, fname + l1, l2);
 459
 460         if (first_hlink_ndx >= 0) {
 461                 write_varint30(f, first_hlink_ndx);
 462                 goto the_end;
 463         }
 464
 465         write_varlong30(f, F_LENGTH(file), 3);
 466         if (!(flags & XMIT_SAME_TIME)) {
 467                 if (protocol_version >= 30)
 468                         write_varlong(f, modtime, 4);
 469                 else
 470                         write_int(f, modtime);
 471         }
 472         if (!(flags & XMIT_SAME_MODE))
 473                 write_int(f, to_wire_mode(mode));
 474         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 475                 if (protocol_version < 30)
 476                         write_int(f, uid);
 477                 else {
 478                         write_varint(f, uid);
 479                         if (flags & XMIT_USER_NAME_FOLLOWS) {
 480                                 int len = strlen(user_name);
 481                                 write_byte(f, len);
 482                                 write_buf(f, user_name, len);
 483                         }
 484                 }
 485         }
 486         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 487                 if (protocol_version < 30)
 488                         write_int(f, gid);
 489                 else {
 490                         write_varint(f, gid);
 491                         if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 492                                 int len = strlen(group_name);
 493                                 write_byte(f, len);
 494                                 write_buf(f, group_name, len);
 495                         }
 496                 }
 497         }
 498         if ((preserve_devices && IS_DEVICE(mode))
 499          || (preserve_specials && IS_SPECIAL(mode))) {
 500                 if (protocol_version < 28) {
 501                         if (!(flags & XMIT_SAME_RDEV_pre28))
 502                                 write_int(f, (int)rdev);
 503                 } else {
 504                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 505                                 write_varint30(f, major(rdev));
 506                         if (protocol_version >= 30)
 507                                 write_varint(f, minor(rdev));
 508                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 509                                 write_byte(f, minor(rdev));
 510                         else
 511                                 write_int(f, minor(rdev));
 512                 }
 513         }
 514
 515 #ifdef SUPPORT_LINKS
 516         if (preserve_links && S_ISLNK(mode)) {
 517                 const char *sl = F_SYMLINK(file);
 518                 int len = strlen(sl);
 519                 write_varint30(f, len);
 520                 write_buf(f, sl, len);
 521         }
 522 #endif
 523
 524 #ifdef SUPPORT_HARD_LINKS
 525         if (tmp_dev != 0 && protocol_version < 30) {
 526                 if (protocol_version < 26) {
 527                         /* 32-bit dev_t and ino_t */
 528                         write_int(f, (int32)dev);
 529                         write_int(f, (int32)tmp_ino);
 530                 } else {
 531                         /* 64-bit dev_t and ino_t */
 532                         if (!(flags & XMIT_SAME_DEV_pre30))
 533                                 write_longint(f, dev);
 534                         write_longint(f, tmp_ino);
 535                 }
 536         }
 537 #endif
 538
 539         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 540                 const char *sum;
 541                 if (S_ISREG(mode))
 542                         sum = tmp_sum;
 543                 else {
 544                         /* Prior to 28, we sent a useless set of nulls. */
 545                         sum = empty_sum;
 546                 }
 547                 write_buf(f, sum, checksum_len);
 548         }
 549
 550   the_end:
 551         strlcpy(lastname, fname, MAXPATHLEN);
 552
 553         if (S_ISREG(mode) || S_ISLNK(mode))
 554                 stats.total_size += F_LENGTH(file);
 555 }
 556
 557 static struct file_struct *recv_file_entry(struct file_list *flist,
 558                                            int flags, int f)
 559 {
 560         static int64 modtime;
 561         static mode_t mode;
 562         static int64 dev;
 563         static dev_t rdev;
 564         static uint32 rdev_major;
 565         static uid_t uid;
 566         static gid_t gid;
 567         static char lastname[MAXPATHLEN], *lastdir;
 568         static int lastdir_depth, lastdir_len = -1;
 569         static unsigned int del_hier_name_len = 0;
 570         static int in_del_hier = 0;
 571         char thisname[MAXPATHLEN];
 572         unsigned int l1 = 0, l2 = 0;
 573         int alloc_len, basename_len, linkname_len;
 574         int extra_len = file_extra_cnt * EXTRA_LEN;
 575         int first_hlink_ndx = -1;
 576         OFF_T file_length;
 577         const char *basename;
 578         struct file_struct *file;
 579         alloc_pool_t *pool;
 580         char *bp;
 581
 582         if (flags & XMIT_SAME_NAME)
 583                 l1 = read_byte(f);
 584
 585         if (flags & XMIT_LONG_NAME)
 586                 l2 = read_varint30(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_varint30(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                         extra_len += 2 * EXTRA_LEN;
 645                 }
 646                 if (preserve_links && S_ISLNK(mode))
 647                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 648                 else
 649                         linkname_len = 0;
 650                 goto create_object;
 651         }
 652 #endif
 653
 654         file_length = read_varlong30(f, 3);
 655         if (!(flags & XMIT_SAME_TIME)) {
 656                 if (protocol_version >= 30) {
 657                         modtime = read_varlong(f, 4);
 658 #if SIZEOF_TIME_T < SIZEOF_INT64
 659                         if ((modtime > INT_MAX || modtime < INT_MIN) && !am_generator) {
 660                                 rprintf(FERROR,
 661                                     "Time value of %s truncated on receiver.\n",
 662                                     lastname);
 663                         }
 664 #endif
 665                 } else
 666                         modtime = read_int(f);
 667         }
 668         if (!(flags & XMIT_SAME_MODE))
 669                 mode = from_wire_mode(read_int(f));
 670
 671         if (chmod_modes && !S_ISLNK(mode))
 672                 mode = tweak_mode(mode, chmod_modes);
 673
 674         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 675                 if (protocol_version < 30)
 676                         uid = (uid_t)read_int(f);
 677                 else {
 678                         uid = (uid_t)read_varint(f);
 679                         if (flags & XMIT_USER_NAME_FOLLOWS)
 680                                 uid = recv_user_name(f, uid);
 681                         else if (inc_recurse && am_root && !numeric_ids)
 682                                 uid = match_uid(uid);
 683                 }
 684         }
 685         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 686                 if (protocol_version < 30)
 687                         gid = (gid_t)read_int(f);
 688                 else {
 689                         gid = (gid_t)read_varint(f);
 690                         if (flags & XMIT_GROUP_NAME_FOLLOWS)
 691                                 gid = recv_group_name(f, gid);
 692                         else if (inc_recurse && (!am_root || !numeric_ids))
 693                                 gid = match_gid(gid);
 694                 }
 695         }
 696
 697         if ((preserve_devices && IS_DEVICE(mode))
 698          || (preserve_specials && IS_SPECIAL(mode))) {
 699                 if (protocol_version < 28) {
 700                         if (!(flags & XMIT_SAME_RDEV_pre28))
 701                                 rdev = (dev_t)read_int(f);
 702                 } else {
 703                         uint32 rdev_minor;
 704                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 705                                 rdev_major = read_varint30(f);
 706                         if (protocol_version >= 30)
 707                                 rdev_minor = read_varint(f);
 708                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 709                                 rdev_minor = read_byte(f);
 710                         else
 711                                 rdev_minor = read_int(f);
 712                         rdev = MAKEDEV(rdev_major, rdev_minor);
 713                 }
 714                 extra_len += 2 * EXTRA_LEN;
 715                 file_length = 0;
 716         } else if (protocol_version < 28)
 717                 rdev = MAKEDEV(0, 0);
 718
 719 #ifdef SUPPORT_LINKS
 720         if (preserve_links && S_ISLNK(mode)) {
 721                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 722                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 723                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 724                                 linkname_len - 1);
 725                         overflow_exit("recv_file_entry");
 726                 }
 727         }
 728         else
 729 #endif
 730                 linkname_len = 0;
 731
 732 #ifdef SUPPORT_HARD_LINKS
 733   create_object:
 734         if (preserve_hard_links) {
 735                 if (protocol_version < 28 && S_ISREG(mode))
 736                         flags |= XMIT_HLINKED;
 737                 if (flags & XMIT_HLINKED)
 738                         extra_len += EXTRA_LEN;
 739         }
 740 #endif
 741
 742 #ifdef SUPPORT_ACLS
 743         /* We need one or two index int32s when we're preserving ACLs. */
 744         if (preserve_acls)
 745                 extra_len += (S_ISDIR(mode) ? 2 : 1) * EXTRA_LEN;
 746 #endif
 747
 748         if (always_checksum && S_ISREG(mode))
 749                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 750
 751         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 752                 extra_len += EXTRA_LEN;
 753
 754 #if EXTRA_ROUNDING > 0
 755         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 756                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 757 #endif
 758
 759         if (inc_recurse && S_ISDIR(mode)) {
 760                 if (one_file_system) {
 761                         /* Room to save the dir's device for -x */
 762                         extra_len += 2 * EXTRA_LEN;
 763                 }
 764                 pool = dir_flist->file_pool;
 765         } else
 766                 pool = flist->file_pool;
 767
 768         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 769                   + linkname_len;
 770         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
 771
 772         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 773         bp += extra_len;
 774         file = (struct file_struct *)bp;
 775         bp += FILE_STRUCT_LEN;
 776
 777         memcpy(bp, basename, basename_len);
 778         bp += basename_len + linkname_len; /* skip space for symlink too */
 779
 780 #ifdef SUPPORT_HARD_LINKS
 781         if (flags & XMIT_HLINKED)
 782                 file->flags |= FLAG_HLINKED;
 783 #endif
 784         file->modtime = (time_t)modtime;
 785         file->len32 = (uint32)file_length;
 786         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 787                 file->flags |= FLAG_LENGTH64;
 788                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 789         }
 790         file->mode = mode;
 791         if (preserve_uid)
 792                 F_OWNER(file) = uid;
 793         if (preserve_gid)
 794                 F_GROUP(file) = gid;
 795
 796         if (basename != thisname) {
 797                 file->dirname = lastdir;
 798                 F_DEPTH(file) = lastdir_depth + 1;
 799         } else
 800                 F_DEPTH(file) = 1;
 801
 802         if (S_ISDIR(mode)) {
 803                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 804                         F_DEPTH(file)--;
 805                 if (flags & XMIT_TOP_DIR) {
 806                         in_del_hier = recurse;
 807                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 808                         if (relative_paths && del_hier_name_len > 2
 809                             && lastname[del_hier_name_len-1] == '.'
 810                             && lastname[del_hier_name_len-2] == '/')
 811                                 del_hier_name_len -= 2;
 812                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 813                 } else if (in_del_hier) {
 814                         if (!relative_paths || !del_hier_name_len
 815                          || (l1 >= del_hier_name_len
 816                           && lastname[del_hier_name_len] == '/'))
 817                                 file->flags |= FLAG_XFER_DIR;
 818                         else
 819                                 in_del_hier = 0;
 820                 }
 821         }
 822
 823         if ((preserve_devices && IS_DEVICE(mode))
 824          || (preserve_specials && IS_SPECIAL(mode))) {
 825                 uint32 *devp = F_RDEV_P(file);
 826                 DEV_MAJOR(devp) = major(rdev);
 827                 DEV_MINOR(devp) = minor(rdev);
 828         }
 829
 830 #ifdef SUPPORT_LINKS
 831         if (linkname_len) {
 832                 bp = (char*)file->basename + basename_len;
 833                 if (first_hlink_ndx >= 0) {
 834                         struct file_struct *first = flist->files[first_hlink_ndx];
 835                         memcpy(bp, F_SYMLINK(first), linkname_len);
 836                 } else
 837                         read_sbuf(f, bp, linkname_len - 1);
 838                 if (sanitize_paths)
 839                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 840         }
 841 #endif
 842
 843 #ifdef SUPPORT_HARD_LINKS
 844         if (preserve_hard_links && flags & XMIT_HLINKED) {
 845                 if (protocol_version >= 30) {
 846                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 847                                         ? flist->count : first_hlink_ndx;
 848                 } else {
 849                         static int32 cnt = 0;
 850                         struct idev_node *np;
 851                         int64 ino;
 852                         int32 ndx;
 853                         if (protocol_version < 26) {
 854                                 dev = read_int(f);
 855                                 ino = read_int(f);
 856                         } else {
 857                                 if (!(flags & XMIT_SAME_DEV_pre30))
 858                                         dev = read_longint(f);
 859                                 ino = read_longint(f);
 860                         }
 861                         np = idev_node(dev, ino);
 862                         ndx = (int32)(long)np->data - 1;
 863                         if (ndx < 0) {
 864                                 ndx = cnt++;
 865                                 np->data = (void*)(long)cnt;
 866                         }
 867                         F_HL_GNUM(file) = ndx;
 868                 }
 869         }
 870 #endif
 871
 872         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 873                 if (S_ISREG(mode))
 874                         bp = (char*)F_SUM(file);
 875                 else {
 876                         /* Prior to 28, we get a useless set of nulls. */
 877                         bp = tmp_sum;
 878                 }
 879                 if (first_hlink_ndx >= 0) {
 880                         struct file_struct *first = flist->files[first_hlink_ndx];
 881                         memcpy(bp, F_SUM(first), checksum_len);
 882                 } else
 883                         read_buf(f, bp, checksum_len);
 884         }
 885
 886 #ifdef SUPPORT_ACLS
 887         if (preserve_acls && !S_ISLNK(mode))
 888                 receive_acl(file, f);
 889 #endif
 890 #ifdef SUPPORT_XATTRS
 891         if (preserve_xattrs)
 892                 receive_xattr(file, f );
 893 #endif
 894
 895         if (S_ISREG(mode) || S_ISLNK(mode))
 896                 stats.total_size += file_length;
 897
 898         return file;
 899 }
 900
 901 /**
 902  * Create a file_struct for a named file by reading its stat()
 903  * information and performing extensive checks against global
 904  * options.
 905  *
 906  * @return the new file, or NULL if there was an error or this file
 907  * should be excluded.
 908  *
 909  * @todo There is a small optimization opportunity here to avoid
 910  * stat()ing the file in some circumstances, which has a certain cost.
 911  * We are called immediately after doing readdir(), and so we may
 912  * already know the d_type of the file.  We could for example avoid
 913  * statting directories if we're not recursing, but this is not a very
 914  * important case.  Some systems may not have d_type.
 915  **/
 916 struct file_struct *make_file(const char *fname, struct file_list *flist,
 917                               STRUCT_STAT *stp, int flags, int filter_level)
 918 {
 919         static char *lastdir;
 920         static int lastdir_len = -1;
 921         struct file_struct *file;
 922         STRUCT_STAT st;
 923         char thisname[MAXPATHLEN];
 924         char linkname[MAXPATHLEN];
 925         int alloc_len, basename_len, linkname_len;
 926         int extra_len = file_extra_cnt * EXTRA_LEN;
 927         const char *basename;
 928         char *bp;
 929
 930         if (strlcpy(thisname, fname, sizeof thisname)
 931             >= sizeof thisname - pathname_len) {
 932                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 933                 return NULL;
 934         }
 935         clean_fname(thisname, 0);
 936         if (sanitize_paths)
 937                 sanitize_path(thisname, thisname, "", 0, NULL);
 938
 939         if (stp && S_ISDIR(stp->st_mode)) {
 940                 st = *stp; /* Needed for "symlink/." with --relative. */
 941                 *linkname = '\0'; /* make IBM code checker happy */
 942         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 943                 int save_errno = errno;
 944                 /* See if file is excluded before reporting an error. */
 945                 if (filter_level != NO_FILTERS
 946                  && (is_excluded(thisname, 0, filter_level)
 947                   || is_excluded(thisname, 1, filter_level))) {
 948                         if (ignore_perishable && save_errno != ENOENT)
 949                                 non_perishable_cnt++;
 950                         return NULL;
 951                 }
 952                 if (save_errno == ENOENT) {
 953 #ifdef SUPPORT_LINKS
 954                         /* Avoid "vanished" error if symlink points nowhere. */
 955                         if (copy_links && x_lstat(thisname, &st, NULL) == 0
 956                             && S_ISLNK(st.st_mode)) {
 957                                 io_error |= IOERR_GENERAL;
 958                                 rprintf(FERROR, "symlink has no referent: %s\n",
 959                                         full_fname(thisname));
 960                         } else
 961 #endif
 962                         {
 963                                 enum logcode c = am_daemon && protocol_version < 28
 964                                     ? FERROR : FINFO;
 965                                 io_error |= IOERR_VANISHED;
 966                                 rprintf(c, "file has vanished: %s\n",
 967                                         full_fname(thisname));
 968                         }
 969                 } else {
 970                         io_error |= IOERR_GENERAL;
 971                         rsyserr(FERROR, save_errno, "readlink %s failed",
 972                                 full_fname(thisname));
 973                 }
 974                 return NULL;
 975         }
 976
 977         /* backup.c calls us with filter_level set to NO_FILTERS. */
 978         if (filter_level == NO_FILTERS)
 979                 goto skip_filters;
 980
 981         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 982                 rprintf(FINFO, "skipping directory %s\n", thisname);
 983                 return NULL;
 984         }
 985
 986         /* -x only affects directories because we need to avoid recursing
 987          * into a mount-point directory, not to avoid copying a symlinked
 988          * file if -L (or similar) was specified. */
 989         if (one_file_system && st.st_dev != filesystem_dev
 990          && S_ISDIR(st.st_mode)) {
 991                 if (one_file_system > 1) {
 992                         if (verbose > 2) {
 993                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 994                                         thisname);
 995                         }
 996                         return NULL;
 997                 }
 998                 flags |= FLAG_MOUNT_DIR;
 999         }
1000
1001         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1002                 if (ignore_perishable)
1003                         non_perishable_cnt++;
1004                 return NULL;
1005         }
1006
1007         if (lp_ignore_nonreadable(module_id)) {
1008 #ifdef SUPPORT_LINKS
1009                 if (!S_ISLNK(st.st_mode))
1010 #endif
1011                         if (access(thisname, R_OK) != 0)
1012                                 return NULL;
1013         }
1014
1015   skip_filters:
1016
1017         /* Only divert a directory in the main transfer. */
1018         if (flist && flist->prev && S_ISDIR(st.st_mode)
1019          && flags & FLAG_DIVERT_DIRS) {
1020                 flist = dir_flist;
1021                 /* Room for parent/sibling/next-child info. */
1022                 extra_len += 3 * EXTRA_LEN;
1023         }
1024
1025         if (verbose > 2) {
1026                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1027                         who_am_i(), thisname, filter_level);
1028         }
1029
1030         if ((basename = strrchr(thisname, '/')) != NULL) {
1031                 int len = basename++ - thisname;
1032                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1033                         lastdir = new_array(char, len + 1);
1034                         memcpy(lastdir, thisname, len);
1035                         lastdir[len] = '\0';
1036                         lastdir_len = len;
1037                 }
1038         } else
1039                 basename = thisname;
1040         basename_len = strlen(basename) + 1; /* count the '\0' */
1041
1042 #ifdef SUPPORT_LINKS
1043         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1044 #else
1045         linkname_len = 0;
1046 #endif
1047
1048         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1049                 extra_len += EXTRA_LEN;
1050
1051 #if EXTRA_ROUNDING > 0
1052         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1053                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1054 #endif
1055
1056         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1057                   + linkname_len;
1058         if (flist)
1059                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1060         else {
1061                 if (!(bp = new_array(char, alloc_len)))
1062                         out_of_memory("make_file");
1063         }
1064
1065         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1066         bp += extra_len;
1067         file = (struct file_struct *)bp;
1068         bp += FILE_STRUCT_LEN;
1069
1070         memcpy(bp, basename, basename_len);
1071         bp += basename_len + linkname_len; /* skip space for symlink too */
1072
1073 #ifdef SUPPORT_HARD_LINKS
1074         if (preserve_hard_links && flist && flist->prev) {
1075                 if (protocol_version >= 28
1076                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1077                  : S_ISREG(st.st_mode)) {
1078                         tmp_dev = st.st_dev;
1079                         tmp_ino = st.st_ino;
1080                 } else
1081                         tmp_dev = 0;
1082         }
1083 #endif
1084
1085 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1086         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1087                 tmp_rdev = st.st_rdev;
1088                 st.st_size = 0;
1089         }
1090 #endif
1091
1092         file->flags = flags;
1093         file->modtime = st.st_mtime;
1094         file->len32 = (uint32)st.st_size;
1095         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1096                 file->flags |= FLAG_LENGTH64;
1097                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1098         }
1099         file->mode = st.st_mode;
1100         if (preserve_uid)
1101                 F_OWNER(file) = st.st_uid;
1102         if (preserve_gid)
1103                 F_GROUP(file) = st.st_gid;
1104
1105         if (basename != thisname)
1106                 file->dirname = lastdir;
1107
1108 #ifdef SUPPORT_LINKS
1109         if (linkname_len) {
1110                 bp = (char*)file->basename + basename_len;
1111                 memcpy(bp, linkname, linkname_len);
1112         }
1113 #endif
1114
1115         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1116                 file_checksum(thisname, tmp_sum, st.st_size);
1117
1118         F_PATHNAME(file) = pathname;
1119
1120         /* This code is only used by the receiver when it is building
1121          * a list of files for a delete pass. */
1122         if (keep_dirlinks && linkname_len && flist) {
1123                 STRUCT_STAT st2;
1124                 int save_mode = file->mode;
1125                 file->mode = S_IFDIR; /* Find a directory with our name. */
1126                 if (flist_find(dir_flist, file) >= 0
1127                     && x_stat(thisname, &st2, NULL) == 0 && S_ISDIR(st2.st_mode)) {
1128                         file->modtime = st2.st_mtime;
1129                         file->len32 = 0;
1130                         file->mode = st2.st_mode;
1131                         if (preserve_uid)
1132                                 F_OWNER(file) = st2.st_uid;
1133                         if (preserve_gid)
1134                                 F_GROUP(file) = st2.st_gid;
1135                 } else
1136                         file->mode = save_mode;
1137         }
1138
1139         if (basename_len == 0+1)
1140                 return NULL;
1141
1142         if (inc_recurse && flist == dir_flist) {
1143                 flist_expand(flist);
1144                 flist->files[flist->count++] = file;
1145         }
1146
1147         return file;
1148 }
1149
1150 /* Only called for temporary file_struct entries created by make_file(). */
1151 void unmake_file(struct file_struct *file)
1152 {
1153         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1154 #if EXTRA_ROUNDING > 0
1155         if (extra_cnt & EXTRA_ROUNDING)
1156                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1157 #endif
1158         free(REQ_EXTRA(file, extra_cnt));
1159 }
1160
1161 static struct file_struct *send_file_name(int f, struct file_list *flist,
1162                                           char *fname, STRUCT_STAT *stp,
1163                                           int flags, int filter_flags)
1164 {
1165         struct file_struct *file;
1166 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1167         statx sx;
1168 #endif
1169
1170         file = make_file(fname, flist, stp, flags, filter_flags);
1171         if (!file)
1172                 return NULL;
1173
1174         if (chmod_modes && !S_ISLNK(file->mode))
1175                 file->mode = tweak_mode(file->mode, chmod_modes);
1176
1177 #ifdef SUPPORT_ACLS
1178         if (preserve_acls && !S_ISLNK(file->mode) && f >= 0) {
1179                 sx.st.st_mode = file->mode;
1180                 sx.acc_acl = sx.def_acl = NULL;
1181                 if (get_acl(fname, &sx) < 0)
1182                         return NULL;
1183         }
1184 #endif
1185 #ifdef SUPPORT_XATTRS
1186         if (preserve_xattrs && f >= 0) {
1187                 sx.xattr = NULL;
1188                 if (get_xattr(fname, &sx) < 0)
1189                         return NULL;
1190         }
1191 #endif
1192
1193         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1194
1195         flist_expand(flist);
1196         flist->files[flist->count++] = file;
1197         if (f >= 0) {
1198                 send_file_entry(f, file, flist->count - 1);
1199 #ifdef SUPPORT_ACLS
1200                 if (preserve_acls && !S_ISLNK(file->mode)) {
1201                         send_acl(&sx, f);
1202                         free_acl(&sx);
1203                 }
1204 #endif
1205 #ifdef SUPPORT_XATTRS
1206                 if (preserve_xattrs) {
1207                         F_XATTR(file) = send_xattr(&sx, f);
1208                         free_xattr(&sx);
1209                 }
1210 #endif
1211         }
1212         return file;
1213 }
1214
1215 static void send_if_directory(int f, struct file_list *flist,
1216                               struct file_struct *file,
1217                               char *fbuf, unsigned int ol,
1218                               int flags)
1219 {
1220         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1221
1222         if (S_ISDIR(file->mode)
1223             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1224                 void *save_filters;
1225                 unsigned int len = strlen(fbuf);
1226                 if (len > 1 && fbuf[len-1] == '/')
1227                         fbuf[--len] = '\0';
1228                 if (len >= MAXPATHLEN - 1) {
1229                         io_error |= IOERR_GENERAL;
1230                         rprintf(FERROR, "skipping long-named directory: %s\n",
1231                                 full_fname(fbuf));
1232                         return;
1233                 }
1234                 save_filters = push_local_filters(fbuf, len);
1235                 send_directory(f, flist, -1, fbuf, len, flags);
1236                 pop_local_filters(save_filters);
1237                 fbuf[ol] = '\0';
1238                 if (is_dot_dir)
1239                         fbuf[ol-1] = '.';
1240         }
1241 }
1242
1243 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1244 {
1245         return f_name_cmp(*file1, *file2);
1246 }
1247
1248 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1249  * sort them by name, and link them into the tree, setting the appropriate
1250  * parent/child/sibling pointers. */
1251 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1252 {
1253         int i;
1254         int32 *dp = NULL;
1255         int32 *parent_dp = parent_ndx < 0 ? NULL
1256                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1257
1258         qsort(dir_flist->files + start, end - start + 1,
1259               sizeof dir_flist->files[0], (int (*)())file_compare);
1260
1261         for (i = start; i <= end; i++) {
1262                 struct file_struct *file = dir_flist->files[i];
1263                 if (!(file->flags & FLAG_XFER_DIR)
1264                  || file->flags & FLAG_MOUNT_DIR)
1265                         continue;
1266                 if (dp)
1267                         DIR_NEXT_SIBLING(dp) = i;
1268                 else if (parent_dp)
1269                         DIR_FIRST_CHILD(parent_dp) = i;
1270                 else
1271                         send_dir_ndx = i;
1272                 dp = F_DIRNODE_P(file);
1273                 DIR_PARENT(dp) = parent_ndx;
1274                 DIR_FIRST_CHILD(dp) = -1;
1275         }
1276         if (dp)
1277                 DIR_NEXT_SIBLING(dp) = -1;
1278 }
1279
1280 /* This function is normally called by the sender, but the receiving side also
1281  * calls it from get_dirlist() with f set to -1 so that we just construct the
1282  * file list in memory without sending it over the wire.  Also, get_dirlist()
1283  * might call this with f set to -2, which also indicates that local filter
1284  * rules should be ignored. */
1285 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1286                            char *fbuf, int len, int flags)
1287 {
1288         struct dirent *di;
1289         unsigned remainder;
1290         char *p;
1291         DIR *d;
1292         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1293         int start = divert_dirs ? dir_flist->count : flist->count;
1294         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1295
1296         assert(flist != NULL);
1297
1298         if (!(d = opendir(fbuf))) {
1299                 io_error |= IOERR_GENERAL;
1300                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1301                 return;
1302         }
1303
1304         p = fbuf + len;
1305         if (len != 1 || *fbuf != '/')
1306                 *p++ = '/';
1307         *p = '\0';
1308         remainder = MAXPATHLEN - (p - fbuf);
1309
1310         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1311                 char *dname = d_name(di);
1312                 if (dname[0] == '.' && (dname[1] == '\0'
1313                     || (dname[1] == '.' && dname[2] == '\0')))
1314                         continue;
1315                 if (strlcpy(p, dname, remainder) >= remainder) {
1316                         io_error |= IOERR_GENERAL;
1317                         rprintf(FINFO,
1318                                 "cannot send long-named file %s\n",
1319                                 full_fname(fbuf));
1320                         continue;
1321                 }
1322
1323                 send_file_name(f, flist, fbuf, NULL, flags, filter_flags);
1324         }
1325
1326         fbuf[len] = '\0';
1327
1328         if (errno) {
1329                 io_error |= IOERR_GENERAL;
1330                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1331         }
1332
1333         closedir(d);
1334
1335         if (f < 0)
1336                 return;
1337
1338         if (divert_dirs)
1339                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1340         else if (recurse) {
1341                 int i, end = flist->count - 1;
1342                 /* send_if_directory() bumps flist->count, so use "end". */
1343                 for (i = start; i <= end; i++)
1344                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1345         }
1346 }
1347
1348 void send_extra_file_list(int f, int at_least)
1349 {
1350         char fbuf[MAXPATHLEN];
1351         struct file_list *flist;
1352         int64 start_write;
1353         int future_cnt, save_io_error = io_error;
1354
1355         if (flist_eof)
1356                 return;
1357
1358         /* Keep sending data until we have the requested number of
1359          * files in the upcoming file-lists. */
1360         if (cur_flist->next) {
1361                 flist = first_flist->prev; /* the newest flist */
1362                 future_cnt = flist->count + flist->ndx_start
1363                            - cur_flist->next->ndx_start;
1364         } else
1365                 future_cnt = 0;
1366         while (future_cnt < at_least) {
1367                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1368                 int32 *dp;
1369                 int dlen;
1370
1371                 f_name(file, fbuf);
1372                 dlen = strlen(fbuf);
1373
1374                 if (F_PATHNAME(file) != pathname) {
1375                         if (!push_pathname(F_PATHNAME(file), -1))
1376                                 exit_cleanup(RERR_FILESELECT);
1377                 }
1378
1379                 flist = flist_new(0, "send_extra_file_list");
1380                 start_write = stats.total_written;
1381
1382                 write_ndx(f, NDX_FLIST_OFFSET - send_dir_ndx);
1383                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1384                 send_directory(f, flist, send_dir_ndx, fbuf, dlen,
1385                                FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1386                 write_byte(f, 0);
1387
1388                 clean_flist(flist, 0, 0);
1389                 file_total += flist->count;
1390                 future_cnt += flist->count;
1391                 stats.flist_size += stats.total_written - start_write;
1392                 stats.num_files += flist->count;
1393                 if (verbose > 3)
1394                         output_flist(flist);
1395
1396                 dp = F_DIRNODE_P(file);
1397                 if (DIR_FIRST_CHILD(dp) >= 0) {
1398                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1399                         send_dir_depth++;
1400                 } else {
1401                         while (DIR_NEXT_SIBLING(dp) < 0) {
1402                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1403                                         write_ndx(f, NDX_FLIST_EOF);
1404                                         flist_eof = 1;
1405                                         change_local_filter_dir(NULL, 0, 0);
1406                                         goto finish;
1407                                 }
1408                                 send_dir_depth--;
1409                                 file = dir_flist->files[send_dir_ndx];
1410                                 dp = F_DIRNODE_P(file);
1411                         }
1412                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1413                 }
1414         }
1415
1416   finish:
1417         if (io_error != save_io_error && !ignore_errors)
1418                 send_msg_int(MSG_IO_ERROR, io_error);
1419 }
1420
1421 struct file_list *send_file_list(int f, int argc, char *argv[])
1422 {
1423         static const char *lastdir;
1424         static int lastdir_len = -1;
1425         int len, dirlen;
1426         STRUCT_STAT st;
1427         char *p, *dir;
1428         char lastpath[MAXPATHLEN] = "";
1429         struct file_list *flist;
1430         struct timeval start_tv, end_tv;
1431         int64 start_write;
1432         int use_ff_fd = 0;
1433         int flags, disable_buffering;
1434
1435         rprintf(FLOG, "building file list\n");
1436         if (show_filelist_p())
1437                 start_filelist_progress("building file list");
1438         else if (inc_recurse && verbose && !am_server)
1439                 rprintf(FCLIENT, "sending incremental file list\n");
1440
1441         start_write = stats.total_written;
1442         gettimeofday(&start_tv, NULL);
1443
1444 #ifdef SUPPORT_HARD_LINKS
1445         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1446                 init_hard_links();
1447 #endif
1448
1449         flist = cur_flist = flist_new(0, "send_file_list");
1450         if (inc_recurse) {
1451                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1452                 flags = FLAG_DIVERT_DIRS;
1453         } else {
1454                 dir_flist = cur_flist;
1455                 flags = 0;
1456         }
1457
1458         disable_buffering = io_start_buffering_out(f);
1459         if (filesfrom_fd >= 0) {
1460                 if (argv[0] && !push_dir(argv[0], 0)) {
1461                         rsyserr(FERROR, errno, "push_dir %s failed in %s",
1462                                 full_fname(argv[0]), curr_dir);
1463                         exit_cleanup(RERR_FILESELECT);
1464                 }
1465                 use_ff_fd = 1;
1466         }
1467
1468         while (1) {
1469                 char fbuf[MAXPATHLEN];
1470                 char *fn;
1471                 int is_dot_dir;
1472
1473                 if (use_ff_fd) {
1474                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1475                                 break;
1476                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1477                 } else {
1478                         if (argc-- == 0)
1479                                 break;
1480                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1481                         if (sanitize_paths)
1482                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1483                 }
1484
1485                 len = strlen(fbuf);
1486                 if (relative_paths) {
1487                         /* We clean up fbuf below. */
1488                         is_dot_dir = 0;
1489                 } else if (!len || fbuf[len - 1] == '/') {
1490                         if (len == 2 && fbuf[0] == '.') {
1491                                 /* Turn "./" into just "." rather than "./." */
1492                                 fbuf[1] = '\0';
1493                         } else {
1494                                 if (len + 1 >= MAXPATHLEN)
1495                                         overflow_exit("send_file_list");
1496                                 fbuf[len++] = '.';
1497                                 fbuf[len] = '\0';
1498                         }
1499                         is_dot_dir = 1;
1500                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1501                     && (len == 2 || fbuf[len-3] == '/')) {
1502                         if (len + 2 >= MAXPATHLEN)
1503                                 overflow_exit("send_file_list");
1504                         fbuf[len++] = '/';
1505                         fbuf[len++] = '.';
1506                         fbuf[len] = '\0';
1507                         is_dot_dir = 1;
1508                 } else {
1509                         is_dot_dir = fbuf[len-1] == '.'
1510                                    && (len == 1 || fbuf[len-2] == '/');
1511                 }
1512
1513                 dir = NULL;
1514
1515                 if (!relative_paths) {
1516                         p = strrchr(fbuf, '/');
1517                         if (p) {
1518                                 *p = '\0';
1519                                 if (p == fbuf)
1520                                         dir = "/";
1521                                 else
1522                                         dir = fbuf;
1523                                 len -= p - fbuf + 1;
1524                                 fn = p + 1;
1525                         } else
1526                                 fn = fbuf;
1527                 } else {
1528                         if ((p = strstr(fbuf, "/./")) != NULL) {
1529                                 *p = '\0';
1530                                 if (p == fbuf)
1531                                         dir = "/";
1532                                 else
1533                                         dir = fbuf;
1534                                 len -= p - fbuf + 3;
1535                                 fn = p + 3;
1536                         } else
1537                                 fn = fbuf;
1538                         /* Get rid of trailing "/" and "/.". */
1539                         while (len) {
1540                                 if (fn[len - 1] == '/') {
1541                                         is_dot_dir = 1;
1542                                         if (!--len && !dir) {
1543                                                 len++;
1544                                                 break;
1545                                         }
1546                                 }
1547                                 else if (len >= 2 && fn[len - 1] == '.'
1548                                                   && fn[len - 2] == '/') {
1549                                         is_dot_dir = 1;
1550                                         if (!(len -= 2) && !dir) {
1551                                                 len++;
1552                                                 break;
1553                                         }
1554                                 } else
1555                                         break;
1556                         }
1557                         if (len == 1 && fn[0] == '/')
1558                                 fn[len++] = '.';
1559                         fn[len] = '\0';
1560                         /* Reject a ".." dir in the active part of the path. */
1561                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1562                                 if ((p[2] == '/' || p[2] == '\0')
1563                                  && (p == fn || p[-1] == '/')) {
1564                                         rprintf(FERROR,
1565                                             "found \"..\" dir in relative path: %s\n",
1566                                             fbuf);
1567                                         exit_cleanup(RERR_SYNTAX);
1568                                 }
1569                         }
1570                 }
1571
1572                 if (!*fn) {
1573                         len = 1;
1574                         fn = ".";
1575                 }
1576
1577                 dirlen = dir ? strlen(dir) : 0;
1578                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
1579                         if (!push_pathname(dir ? strdup(dir) : NULL, dirlen))
1580                                 goto push_error;
1581                         lastdir = pathname;
1582                         lastdir_len = pathname_len;
1583                 } else if (!push_pathname(lastdir, lastdir_len)) {
1584                   push_error:
1585                         io_error |= IOERR_GENERAL;
1586                         rsyserr(FERROR, errno, "push_dir %s failed in %s",
1587                                 full_fname(dir), curr_dir);
1588                         continue;
1589                 }
1590
1591                 if (fn != fbuf)
1592                         memmove(fbuf, fn, len + 1);
1593
1594                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1595                         io_error |= IOERR_GENERAL;
1596                         rsyserr(FERROR, errno, "link_stat %s failed",
1597                                 full_fname(fbuf));
1598                         continue;
1599                 }
1600
1601                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1602                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1603                         continue;
1604                 }
1605
1606                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1607                         /* Send the implied directories at the start of the
1608                          * source spec, so we get their permissions right. */
1609                         char *lp = lastpath, *slash = fbuf;
1610                         *p = '\0';
1611                         /* Skip any initial directories in our path that we
1612                          * have in common with lastpath. */
1613                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1614                                 if (*fn == '/')
1615                                         slash = fn;
1616                         }
1617                         *p = '/';
1618                         if (fn != p || (*lp && *lp != '/')) {
1619                                 int save_copy_links = copy_links;
1620                                 int save_xfer_dirs = xfer_dirs;
1621                                 int dir_flags = inc_recurse ? FLAG_DIVERT_DIRS : 0;
1622                                 copy_links |= copy_unsafe_links;
1623                                 xfer_dirs = 1;
1624                                 while ((slash = strchr(slash+1, '/')) != 0) {
1625                                         *slash = '\0';
1626                                         send_file_name(f, flist, fbuf, NULL,
1627                                                        dir_flags, ALL_FILTERS);
1628                                         *slash = '/';
1629                                 }
1630                                 copy_links = save_copy_links;
1631                                 xfer_dirs = save_xfer_dirs;
1632                                 *p = '\0';
1633                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1634                                 *p = '/';
1635                         }
1636                 }
1637
1638                 if (one_file_system)
1639                         filesystem_dev = st.st_dev;
1640
1641                 if (recurse || (xfer_dirs && is_dot_dir)) {
1642                         struct file_struct *file;
1643                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR | flags;
1644                         file = send_file_name(f, flist, fbuf, &st,
1645                                               top_flags, ALL_FILTERS);
1646                         if (file && !inc_recurse)
1647                                 send_if_directory(f, flist, file, fbuf, len, flags);
1648                 } else
1649                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1650         }
1651
1652         gettimeofday(&end_tv, NULL);
1653         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1654                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1655         if (stats.flist_buildtime == 0)
1656                 stats.flist_buildtime = 1;
1657         start_tv = end_tv;
1658
1659         write_byte(f, 0); /* Indicate end of file list */
1660
1661 #ifdef SUPPORT_HARD_LINKS
1662         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1663                 idev_destroy();
1664 #endif
1665
1666         if (show_filelist_p())
1667                 finish_filelist_progress(flist);
1668
1669         gettimeofday(&end_tv, NULL);
1670         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1671                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1672
1673         /* Sort the list without removing any duplicates in non-incremental
1674          * mode.  This allows the receiving side to ask for whatever name it
1675          * kept.  For incremental mode, the sender also removes duplicates
1676          * in this initial file-list so that it avoids re-sending duplicated
1677          * directories. */
1678         clean_flist(flist, 0, inc_recurse);
1679         file_total += flist->count;
1680
1681         if (!numeric_ids && !inc_recurse)
1682                 send_uid_list(f);
1683
1684         /* send the io_error flag */
1685         if (protocol_version < 30)
1686                 write_int(f, ignore_errors ? 0 : io_error);
1687         else if (io_error && !ignore_errors)
1688                 send_msg_int(MSG_IO_ERROR, io_error);
1689
1690         if (disable_buffering)
1691                 io_end_buffering_out();
1692
1693         stats.flist_size = stats.total_written - start_write;
1694         stats.num_files = flist->count;
1695
1696         if (verbose > 3)
1697                 output_flist(flist);
1698
1699         if (verbose > 2)
1700                 rprintf(FINFO, "send_file_list done\n");
1701
1702         if (inc_recurse) {
1703                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1704                 if (send_dir_ndx < 0) {
1705                         write_ndx(f, NDX_FLIST_EOF);
1706                         flist_eof = 1;
1707                 }
1708                 else if (file_total == 1) {
1709                         /* If we're creating incremental file-lists and there
1710                          * was just 1 item in the first file-list, send 1 more
1711                          * file-list to check if this is a 1-file xfer. */
1712                         send_extra_file_list(f, 1);
1713                 }
1714         }
1715
1716         return flist;
1717 }
1718
1719 struct file_list *recv_file_list(int f)
1720 {
1721         struct file_list *flist;
1722         int dstart, flags;
1723         int64 start_read;
1724
1725         if (!first_flist)
1726                 rprintf(FLOG, "receiving file list\n");
1727         if (show_filelist_p())
1728                 start_filelist_progress("receiving file list");
1729         else if (inc_recurse && verbose && !am_server && !first_flist)
1730                 rprintf(FCLIENT, "receiving incremental file list\n");
1731
1732         start_read = stats.total_read;
1733
1734         flist = flist_new(0, "recv_file_list");
1735
1736 #ifdef SUPPORT_HARD_LINKS
1737         if (preserve_hard_links && protocol_version < 30)
1738                 init_hard_links();
1739 #endif
1740
1741         if (inc_recurse) {
1742                 if (flist->ndx_start == 0)
1743                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1744                 dstart = dir_flist->count;
1745         } else {
1746                 dir_flist = flist;
1747                 dstart = 0;
1748         }
1749
1750         while ((flags = read_byte(f)) != 0) {
1751                 struct file_struct *file;
1752
1753                 flist_expand(flist);
1754
1755                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1756                         flags |= read_byte(f) << 8;
1757                 file = recv_file_entry(flist, flags, f);
1758
1759                 if (inc_recurse && S_ISDIR(file->mode)) {
1760                         flist_expand(dir_flist);
1761                         dir_flist->files[dir_flist->count++] = file;
1762                 }
1763
1764                 flist->files[flist->count++] = file;
1765
1766                 maybe_emit_filelist_progress(flist->count);
1767
1768                 if (verbose > 2) {
1769                         rprintf(FINFO, "recv_file_name(%s)\n",
1770                                 f_name(file, NULL));
1771                 }
1772         }
1773         file_total += flist->count;
1774
1775         if (verbose > 2)
1776                 rprintf(FINFO, "received %d names\n", flist->count);
1777
1778         if (show_filelist_p())
1779                 finish_filelist_progress(flist);
1780
1781         clean_flist(flist, relative_paths, 1);
1782
1783         if (inc_recurse) {
1784                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1785                       sizeof dir_flist->files[0], (int (*)())file_compare);
1786         } else if (f >= 0)
1787                 recv_uid_list(f, flist);
1788
1789         if (protocol_version < 30) {
1790                 /* Recv the io_error flag */
1791                 if (ignore_errors)
1792                         read_int(f);
1793                 else
1794                         io_error |= read_int(f);
1795         }
1796
1797         if (verbose > 3)
1798                 output_flist(flist);
1799
1800         if (list_only) {
1801                 int i;
1802                 for (i = 0; i < flist->count; i++)
1803                         list_file_entry(flist->files[i]);
1804         }
1805
1806         if (verbose > 2)
1807                 rprintf(FINFO, "recv_file_list done\n");
1808
1809         stats.flist_size += stats.total_read - start_read;
1810         stats.num_files += flist->count;
1811
1812         return flist;
1813 }
1814
1815 /* This is only used once by the receiver if the very first file-list
1816  * has exactly one item in it. */
1817 void recv_additional_file_list(int f)
1818 {
1819         struct file_list *flist;
1820         int ndx = read_ndx(f);
1821         if (ndx == NDX_FLIST_EOF) {
1822                 flist_eof = 1;
1823                 change_local_filter_dir(NULL, 0, 0);
1824         } else {
1825                 ndx = NDX_FLIST_OFFSET - ndx;
1826                 if (ndx < 0 || ndx >= dir_flist->count) {
1827                         ndx = NDX_FLIST_OFFSET - ndx;
1828                         rprintf(FERROR,
1829                                 "Invalid dir index: %d (%d - %d)\n",
1830                                 ndx, NDX_FLIST_OFFSET,
1831                                 NDX_FLIST_OFFSET - dir_flist->count);
1832                         exit_cleanup(RERR_PROTOCOL);
1833                 }
1834                 flist = recv_file_list(f);
1835                 flist->parent_ndx = ndx;
1836         }
1837 }
1838
1839 /* Search for an identically-named item in the file list.  Note that the
1840  * items must agree in their directory-ness, or no match is returned. */
1841 int flist_find(struct file_list *flist, struct file_struct *f)
1842 {
1843         int low = flist->low, high = flist->high;
1844         int diff, mid, mid_up;
1845
1846         while (low <= high) {
1847                 mid = (low + high) / 2;
1848                 if (F_IS_ACTIVE(flist->files[mid]))
1849                         mid_up = mid;
1850                 else {
1851                         /* Scan for the next non-empty entry using the cached
1852                          * distance values.  If the value isn't fully up-to-
1853                          * date, update it. */
1854                         mid_up = mid + F_DEPTH(flist->files[mid]);
1855                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1856                                 do {
1857                                     mid_up += F_DEPTH(flist->files[mid_up]);
1858                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1859                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1860                         }
1861                         if (mid_up > high) {
1862                                 /* If there's nothing left above us, set high to
1863                                  * a non-empty entry below us and continue. */
1864                                 high = mid - (int)flist->files[mid]->len32;
1865                                 if (!F_IS_ACTIVE(flist->files[high])) {
1866                                         do {
1867                                             high -= (int)flist->files[high]->len32;
1868                                         } while (!F_IS_ACTIVE(flist->files[high]));
1869                                         flist->files[mid]->len32 = mid - high;
1870                                 }
1871                                 continue;
1872                         }
1873                 }
1874                 diff = f_name_cmp(flist->files[mid_up], f);
1875                 if (diff == 0) {
1876                         if (protocol_version < 29
1877                             && S_ISDIR(flist->files[mid_up]->mode)
1878                             != S_ISDIR(f->mode))
1879                                 return -1;
1880                         return mid_up;
1881                 }
1882                 if (diff < 0)
1883                         low = mid_up + 1;
1884                 else
1885                         high = mid - 1;
1886         }
1887         return -1;
1888 }
1889
1890 /*
1891  * Free up any resources a file_struct has allocated
1892  * and clear the file.
1893  */
1894 void clear_file(struct file_struct *file)
1895 {
1896         /* The +1 zeros out the first char of the basename. */
1897         memset(file, 0, FILE_STRUCT_LEN + 1);
1898         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1899          * entry.  Likewise for len32 in the opposite direction.  We assume
1900          * that we're alone for now since flist_find() will adjust the counts
1901          * it runs into that aren't up-to-date. */
1902         file->len32 = F_DEPTH(file) = 1;
1903 }
1904
1905 /* Allocate a new file list. */
1906 struct file_list *flist_new(int flags, char *msg)
1907 {
1908         struct file_list *flist;
1909
1910         flist = new(struct file_list);
1911         if (!flist)
1912                 out_of_memory(msg);
1913
1914         memset(flist, 0, sizeof flist[0]);
1915
1916         if (!(flags & FLIST_TEMP)) {
1917                 if (first_flist) {
1918                         flist->ndx_start = first_flist->prev->ndx_start
1919                                          + first_flist->prev->count;
1920                 }
1921                 /* This is a doubly linked list with prev looping back to
1922                  * the end of the list, but the last next pointer is NULL. */
1923                 if (!first_flist)
1924                         first_flist = cur_flist = flist->prev = flist;
1925                 else {
1926                         flist->prev = first_flist->prev;
1927                         flist->prev->next = first_flist->prev = flist;
1928                 }
1929                 flist_cnt++;
1930         }
1931
1932         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1933                 out_of_memory(msg);
1934
1935         return flist;
1936 }
1937
1938 /* Free up all elements in a flist. */
1939 void flist_free(struct file_list *flist)
1940 {
1941         if (!flist->prev)
1942                 ; /* Was FLIST_TEMP dir-list. */
1943         else if (flist == flist->prev) {
1944                 first_flist = cur_flist = NULL;
1945                 file_total = 0;
1946                 flist_cnt = 0;
1947         } else {
1948                 if (flist == cur_flist)
1949                         cur_flist = flist->next;
1950                 if (flist == first_flist)
1951                         first_flist = first_flist->next;
1952                 else {
1953                         flist->prev->next = flist->next;
1954                         if (!flist->next)
1955                                 flist->next = first_flist;
1956                 }
1957                 flist->next->prev = flist->prev;
1958                 file_total -= flist->count;
1959                 flist_cnt--;
1960         }
1961
1962         pool_destroy(flist->file_pool);
1963         free(flist->files);
1964         free(flist);
1965 }
1966
1967 /*
1968  * This routine ensures we don't have any duplicate names in our file list.
1969  * duplicate names can cause corruption because of the pipelining
1970  */
1971 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1972 {
1973         char fbuf[MAXPATHLEN];
1974         int i, prev_i = 0;
1975
1976         if (!flist)
1977                 return;
1978         if (flist->count == 0) {
1979                 flist->high = -1;
1980                 return;
1981         }
1982
1983         qsort(flist->files, flist->count,
1984             sizeof flist->files[0], (int (*)())file_compare);
1985
1986         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1987                 if (F_IS_ACTIVE(flist->files[i])) {
1988                         prev_i = i;
1989                         break;
1990                 }
1991         }
1992         flist->low = prev_i;
1993         while (++i < flist->count) {
1994                 int j;
1995                 struct file_struct *file = flist->files[i];
1996
1997                 if (!F_IS_ACTIVE(file))
1998                         continue;
1999                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
2000                         j = prev_i;
2001                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2002                         int save_mode = file->mode;
2003                         /* Make sure that this directory doesn't duplicate a
2004                          * non-directory earlier in the list. */
2005                         flist->high = prev_i;
2006                         file->mode = S_IFREG;
2007                         j = flist_find(flist, file);
2008                         file->mode = save_mode;
2009                 } else
2010                         j = -1;
2011                 if (j >= 0) {
2012                         struct file_struct *fp = flist->files[j];
2013                         int keep, drop;
2014                         /* If one is a dir and the other is not, we want to
2015                          * keep the dir because it might have contents in the
2016                          * list. */
2017                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
2018                                 if (S_ISDIR(file->mode))
2019                                         keep = i, drop = j;
2020                                 else
2021                                         keep = j, drop = i;
2022                         } else if (protocol_version < 27)
2023                                 keep = j, drop = i;
2024                         else
2025                                 keep = i, drop = j;
2026                         if (verbose > 1 && !am_server) {
2027                                 rprintf(FINFO,
2028                                         "removing duplicate name %s from file list (%d)\n",
2029                                         f_name(file, fbuf), drop);
2030                         }
2031                         /* Make sure we don't lose track of a user-specified
2032                          * top directory. */
2033                         flist->files[keep]->flags |= flist->files[drop]->flags
2034                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
2035
2036                         clear_file(flist->files[drop]);
2037
2038                         if (keep == i) {
2039                                 if (flist->low == drop) {
2040                                         for (j = drop + 1;
2041                                              j < i && !F_IS_ACTIVE(flist->files[j]);
2042                                              j++) {}
2043                                         flist->low = j;
2044                                 }
2045                                 prev_i = i;
2046                         }
2047                 } else
2048                         prev_i = i;
2049         }
2050         flist->high = no_dups ? prev_i : flist->count - 1;
2051
2052         if (strip_root) {
2053                 /* We need to strip off the leading slashes for relative
2054                  * paths, but this must be done _after_ the sorting phase. */
2055                 for (i = flist->low; i <= flist->high; i++) {
2056                         struct file_struct *file = flist->files[i];
2057
2058                         if (!file->dirname)
2059                                 continue;
2060                         while (*file->dirname == '/')
2061                                 file->dirname++;
2062                         if (!*file->dirname)
2063                                 file->dirname = NULL;
2064                 }
2065         }
2066
2067         if (prune_empty_dirs && no_dups) {
2068                 int j, prev_depth = 0;
2069
2070                 prev_i = 0; /* It's OK that this isn't really true. */
2071
2072                 for (i = flist->low; i <= flist->high; i++) {
2073                         struct file_struct *fp, *file = flist->files[i];
2074
2075                         /* This temporarily abuses the F_DEPTH() value for a
2076                          * directory that is in a chain that might get pruned.
2077                          * We restore the old value if it gets a reprieve. */
2078                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2079                                 /* Dump empty dirs when coming back down. */
2080                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2081                                         fp = flist->files[prev_i];
2082                                         if (F_DEPTH(fp) >= 0)
2083                                                 break;
2084                                         prev_i = -F_DEPTH(fp)-1;
2085                                         clear_file(fp);
2086                                 }
2087                                 prev_depth = F_DEPTH(file);
2088                                 if (is_excluded(f_name(file, fbuf), 1,
2089                                                        ALL_FILTERS)) {
2090                                         /* Keep dirs through this dir. */
2091                                         for (j = prev_depth-1; ; j--) {
2092                                                 fp = flist->files[prev_i];
2093                                                 if (F_DEPTH(fp) >= 0)
2094                                                         break;
2095                                                 prev_i = -F_DEPTH(fp)-1;
2096                                                 F_DEPTH(fp) = j;
2097                                         }
2098                                 } else
2099                                         F_DEPTH(file) = -prev_i-1;
2100                                 prev_i = i;
2101                         } else {
2102                                 /* Keep dirs through this non-dir. */
2103                                 for (j = prev_depth; ; j--) {
2104                                         fp = flist->files[prev_i];
2105                                         if (F_DEPTH(fp) >= 0)
2106                                                 break;
2107                                         prev_i = -F_DEPTH(fp)-1;
2108                                         F_DEPTH(fp) = j;
2109                                 }
2110                         }
2111                 }
2112                 /* Dump all remaining empty dirs. */
2113                 while (1) {
2114                         struct file_struct *fp = flist->files[prev_i];
2115                         if (F_DEPTH(fp) >= 0)
2116                                 break;
2117                         prev_i = -F_DEPTH(fp)-1;
2118                         clear_file(fp);
2119                 }
2120
2121                 for (i = flist->low; i <= flist->high; i++) {
2122                         if (F_IS_ACTIVE(flist->files[i]))
2123                                 break;
2124                 }
2125                 flist->low = i;
2126                 for (i = flist->high; i >= flist->low; i--) {
2127                         if (F_IS_ACTIVE(flist->files[i]))
2128                                 break;
2129                 }
2130                 flist->high = i;
2131         }
2132 }
2133
2134 static void output_flist(struct file_list *flist)
2135 {
2136         char uidbuf[16], gidbuf[16], depthbuf[16];
2137         struct file_struct *file;
2138         const char *root, *dir, *slash, *name, *trail;
2139         const char *who = who_am_i();
2140         int i;
2141
2142         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2143                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2144         for (i = 0; i < flist->count; i++) {
2145                 file = flist->files[i];
2146                 if ((am_root || am_sender) && preserve_uid) {
2147                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2148                                  (long)F_UID(file));
2149                 } else
2150                         *uidbuf = '\0';
2151                 if (preserve_gid && F_GID(file) != GID_NONE) {
2152                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2153                                  (long)F_GID(file));
2154                 } else
2155                         *gidbuf = '\0';
2156                 if (!am_sender)
2157                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2158                 if (F_IS_ACTIVE(file)) {
2159                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2160                         if ((dir = file->dirname) == NULL)
2161                                 dir = slash = "";
2162                         else
2163                                 slash = "/";
2164                         name = file->basename;
2165                         trail = S_ISDIR(file->mode) ? "/" : "";
2166                 } else
2167                         root = dir = slash = name = trail = "";
2168                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2169                         who, i, root, dir, slash, name, trail, (int)file->mode,
2170                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2171         }
2172 }
2173
2174 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2175 enum fnc_type { t_PATH, t_ITEM };
2176
2177 /* Compare the names of two file_struct entities, similar to how strcmp()
2178  * would do if it were operating on the joined strings.
2179  *
2180  * Some differences beginning with protocol_version 29: (1) directory names
2181  * are compared with an assumed trailing slash so that they compare in a
2182  * way that would cause them to sort immediately prior to any content they
2183  * may have; (2) a directory of any name compares after a non-directory of
2184  * any name at the same depth; (3) a directory with name "." compares prior
2185  * to anything else.  These changes mean that a directory and a non-dir
2186  * with the same name will not compare as equal (protocol_version >= 29).
2187  *
2188  * The dirname component can be an empty string, but the basename component
2189  * cannot (and never is in the current codebase).  The basename component
2190  * may be NULL (for a removed item), in which case it is considered to be
2191  * after any existing item. */
2192 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2193 {
2194         int dif;
2195         const uchar *c1, *c2;
2196         enum fnc_state state1, state2;
2197         enum fnc_type type1, type2;
2198         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2199
2200         if (!f1 || !F_IS_ACTIVE(f1)) {
2201                 if (!f2 || !F_IS_ACTIVE(f2))
2202                         return 0;
2203                 return -1;
2204         }
2205         if (!f2 || !F_IS_ACTIVE(f2))
2206                 return 1;
2207
2208         c1 = (uchar*)f1->dirname;
2209         c2 = (uchar*)f2->dirname;
2210         if (c1 == c2)
2211                 c1 = c2 = NULL;
2212         if (!c1) {
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         } else {
2222                 type1 = t_path;
2223                 state1 = s_DIR;
2224         }
2225         if (!c2) {
2226                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2227                 c2 = (const uchar*)f2->basename;
2228                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2229                         type2 = t_ITEM;
2230                         state2 = s_TRAILING;
2231                         c2 = (uchar*)"";
2232                 } else
2233                         state2 = s_BASE;
2234         } else {
2235                 type2 = t_path;
2236                 state2 = s_DIR;
2237         }
2238
2239         if (type1 != type2)
2240                 return type1 == t_PATH ? 1 : -1;
2241
2242         do {
2243                 if (!*c1) {
2244                         switch (state1) {
2245                         case s_DIR:
2246                                 state1 = s_SLASH;
2247                                 c1 = (uchar*)"/";
2248                                 break;
2249                         case s_SLASH:
2250                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2251                                 c1 = (const uchar*)f1->basename;
2252                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2253                                         type1 = t_ITEM;
2254                                         state1 = s_TRAILING;
2255                                         c1 = (uchar*)"";
2256                                 } else
2257                                         state1 = s_BASE;
2258                                 break;
2259                         case s_BASE:
2260                                 state1 = s_TRAILING;
2261                                 if (type1 == t_PATH) {
2262                                         c1 = (uchar*)"/";
2263                                         break;
2264                                 }
2265                                 /* FALL THROUGH */
2266                         case s_TRAILING:
2267                                 type1 = t_ITEM;
2268                                 break;
2269                         }
2270                         if (*c2 && type1 != type2)
2271                                 return type1 == t_PATH ? 1 : -1;
2272                 }
2273                 if (!*c2) {
2274                         switch (state2) {
2275                         case s_DIR:
2276                                 state2 = s_SLASH;
2277                                 c2 = (uchar*)"/";
2278                                 break;
2279                         case s_SLASH:
2280                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2281                                 c2 = (const uchar*)f2->basename;
2282                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2283                                         type2 = t_ITEM;
2284                                         state2 = s_TRAILING;
2285                                         c2 = (uchar*)"";
2286                                 } else
2287                                         state2 = s_BASE;
2288                                 break;
2289                         case s_BASE:
2290                                 state2 = s_TRAILING;
2291                                 if (type2 == t_PATH) {
2292                                         c2 = (uchar*)"/";
2293                                         break;
2294                                 }
2295                                 /* FALL THROUGH */
2296                         case s_TRAILING:
2297                                 if (!*c1)
2298                                         return 0;
2299                                 type2 = t_ITEM;
2300                                 break;
2301                         }
2302                         if (type1 != type2)
2303                                 return type1 == t_PATH ? 1 : -1;
2304                 }
2305         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2306
2307         return dif;
2308 }
2309
2310 char *f_name_buf(void)
2311 {
2312         static char names[5][MAXPATHLEN];
2313         static unsigned int n;
2314
2315         n = (n + 1) % (sizeof names / sizeof names[0]);
2316
2317         return names[n];
2318 }
2319
2320 /* Return a copy of the full filename of a flist entry, using the indicated
2321  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2322  * done because we checked the size when creating the file_struct entry.
2323  */
2324 char *f_name(struct file_struct *f, char *fbuf)
2325 {
2326         if (!f || !F_IS_ACTIVE(f))
2327                 return NULL;
2328
2329         if (!fbuf)
2330                 fbuf = f_name_buf();
2331
2332         if (f->dirname) {
2333                 int len = strlen(f->dirname);
2334                 memcpy(fbuf, f->dirname, len);
2335                 fbuf[len] = '/';
2336                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2337         } else
2338                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2339
2340         return fbuf;
2341 }
2342
2343 /* Do a non-recursive scan of the named directory, possibly ignoring all
2344  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2345  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2346  * buffer (the functions we call will append names onto the end, but the old
2347  * dir value will be restored on exit). */
2348 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2349 {
2350         struct file_list *dirlist;
2351         char dirbuf[MAXPATHLEN];
2352         int save_recurse = recurse;
2353         int save_xfer_dirs = xfer_dirs;
2354
2355         if (dlen < 0) {
2356                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2357                 if (dlen >= MAXPATHLEN)
2358                         return NULL;
2359                 dirname = dirbuf;
2360         }
2361
2362         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2363
2364         recurse = 0;
2365         xfer_dirs = 1;
2366         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2367         xfer_dirs = save_xfer_dirs;
2368         recurse = save_recurse;
2369         if (do_progress)
2370                 flist_count_offset += dirlist->count;
2371
2372         clean_flist(dirlist, 0, 0);
2373
2374         if (verbose > 3)
2375                 output_flist(dirlist);
2376
2377         return dirlist;
2378 }