flist.c

   1 /*
   2  * Generate and receive file lists.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2002, 2003, 2004, 2005, 2006 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  22  */
  23
  24 #include "rsync.h"
  25 #include "rounding.h"
  26
  27 extern int verbose;
  28 extern int list_only;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int incremental;
  34 extern int do_progress;
  35 extern int always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38 extern int numeric_ids;
  39 extern int recurse;
  40 extern int xfer_dirs;
  41 extern int filesfrom_fd;
  42 extern int one_file_system;
  43 extern int copy_dirlinks;
  44 extern int keep_dirlinks;
  45 extern int preserve_links;
  46 extern int preserve_hard_links;
  47 extern int preserve_devices;
  48 extern int preserve_specials;
  49 extern int preserve_uid;
  50 extern int preserve_gid;
  51 extern int relative_paths;
  52 extern int implied_dirs;
  53 extern int file_extra_cnt;
  54 extern int ignore_perishable;
  55 extern int non_perishable_cnt;
  56 extern int prune_empty_dirs;
  57 extern int copy_links;
  58 extern int copy_unsafe_links;
  59 extern int protocol_version;
  60 extern int sanitize_paths;
  61 extern struct stats stats;
  62
  63 extern char curr_dir[MAXPATHLEN];
  64
  65 extern struct chmod_mode_struct *chmod_modes;
  66
  67 extern struct filter_list_struct filter_list;
  68 extern struct filter_list_struct server_filter_list;
  69
  70 int io_error;
  71 int checksum_len;
  72 dev_t filesystem_dev; /* used to implement -x */
  73
  74 struct file_list *cur_flist, *first_flist, *dir_flist;
  75 int send_dir_ndx = -1, send_dir_depth = 0;
  76 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  77 int file_total = 0; /* total of all active items over all file-lists */
  78 int flist_eof = 0; /* all the file-lists are now known */
  79
  80 /* The tmp_* vars are used as a cache area by make_file() to store data
  81  * that the sender doesn't need to remember in its file list.  The data
  82  * will survive just long enough to be used by send_file_entry(). */
  83 static dev_t tmp_rdev;
  84 #ifdef SUPPORT_HARD_LINKS
  85 static int64 tmp_dev, tmp_ino;
  86 #endif
  87 static char tmp_sum[MD4_SUM_LENGTH];
  88
  89 static char empty_sum[MD4_SUM_LENGTH];
  90 static int flist_count_offset; /* for --delete --progress */
  91
  92 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  93 static void output_flist(struct file_list *flist);
  94
  95 void init_flist(void)
  96 {
  97         if (verbose > 4) {
  98                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
  99                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 100         }
 101         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
 102 }
 103
 104 static int show_filelist_p(void)
 105 {
 106         return verbose && xfer_dirs && !am_server && !incremental;
 107 }
 108
 109 static void start_filelist_progress(char *kind)
 110 {
 111         rprintf(FCLIENT, "%s ... ", kind);
 112         if (verbose > 1 || do_progress)
 113                 rprintf(FCLIENT, "\n");
 114         rflush(FINFO);
 115 }
 116
 117 static void emit_filelist_progress(int count)
 118 {
 119         rprintf(FCLIENT, " %d files...\r", count);
 120 }
 121
 122 static void maybe_emit_filelist_progress(int count)
 123 {
 124         if (do_progress && show_filelist_p() && (count % 100) == 0)
 125                 emit_filelist_progress(count);
 126 }
 127
 128 static void finish_filelist_progress(const struct file_list *flist)
 129 {
 130         if (do_progress) {
 131                 /* This overwrites the progress line */
 132                 rprintf(FINFO, "%d file%sto consider\n",
 133                         flist->count, flist->count == 1 ? " " : "s ");
 134         } else
 135                 rprintf(FINFO, "done\n");
 136 }
 137
 138 void show_flist_stats(void)
 139 {
 140         /* Nothing yet */
 141 }
 142
 143 static void list_file_entry(struct file_struct *f)
 144 {
 145         char permbuf[PERMSTRING_SIZE];
 146         double len;
 147
 148         if (!F_IS_ACTIVE(f)) {
 149                 /* this can happen if duplicate names were removed */
 150                 return;
 151         }
 152
 153         permstring(permbuf, f->mode);
 154         len = F_LENGTH(f);
 155
 156 #ifdef SUPPORT_LINKS
 157         if (preserve_links && S_ISLNK(f->mode)) {
 158                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 159                         permbuf, len, timestring(f->modtime),
 160                         f_name(f, NULL), F_SYMLINK(f));
 161         } else
 162 #endif
 163         {
 164                 rprintf(FINFO, "%s %11.0f %s %s\n",
 165                         permbuf, len, timestring(f->modtime),
 166                         f_name(f, NULL));
 167         }
 168 }
 169
 170 /* Stat either a symlink or its referent, depending on the settings of
 171  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 172  *
 173  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 174  * MAXPATHLEN chars) will be set to the symlink's target string.
 175  *
 176  * The stat structure pointed to by stp will contain information about the
 177  * link or the referent as appropriate, if they exist. */
 178 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 179 {
 180 #ifdef SUPPORT_LINKS
 181         if (link_stat(path, stp, copy_dirlinks) < 0)
 182                 return -1;
 183         if (S_ISLNK(stp->st_mode)) {
 184                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 185                 if (llen < 0)
 186                         return -1;
 187                 linkbuf[llen] = '\0';
 188                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 189                         if (verbose > 1) {
 190                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 191                                         path, linkbuf);
 192                         }
 193                         return do_stat(path, stp);
 194                 }
 195         }
 196         return 0;
 197 #else
 198         return do_stat(path, stp);
 199 #endif
 200 }
 201
 202 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 203 {
 204 #ifdef SUPPORT_LINKS
 205         if (copy_links)
 206                 return do_stat(path, stp);
 207         if (do_lstat(path, stp) < 0)
 208                 return -1;
 209         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 210                 STRUCT_STAT st;
 211                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 212                         *stp = st;
 213         }
 214         return 0;
 215 #else
 216         return do_stat(path, stp);
 217 #endif
 218 }
 219
 220 /* This function is used to check if a file should be included/excluded
 221  * from the list of files based on its name and type etc.  The value of
 222  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 223 static int is_excluded(char *fname, int is_dir, int filter_level)
 224 {
 225 #if 0 /* This currently never happens, so avoid a useless compare. */
 226         if (filter_level == NO_FILTERS)
 227                 return 0;
 228 #endif
 229         if (fname) {
 230                 /* never exclude '.', even if somebody does --exclude '*' */
 231                 if (fname[0] == '.' && !fname[1])
 232                         return 0;
 233                 /* Handle the -R version of the '.' dir. */
 234                 if (fname[0] == '/') {
 235                         int len = strlen(fname);
 236                         if (fname[len-1] == '.' && fname[len-2] == '/')
 237                                 return 0;
 238                 }
 239         }
 240         if (server_filter_list.head
 241             && check_filter(&server_filter_list, fname, is_dir) < 0)
 242                 return 1;
 243         if (filter_level != ALL_FILTERS)
 244                 return 0;
 245         if (filter_list.head
 246             && check_filter(&filter_list, fname, is_dir) < 0)
 247                 return 1;
 248         return 0;
 249 }
 250
 251 static int to_wire_mode(mode_t mode)
 252 {
 253 #ifdef SUPPORT_LINKS
 254 #if _S_IFLNK != 0120000
 255         if (S_ISLNK(mode))
 256                 return (mode & ~(_S_IFMT)) | 0120000;
 257 #endif
 258 #endif
 259         return mode;
 260 }
 261
 262 static mode_t from_wire_mode(int mode)
 263 {
 264 #if _S_IFLNK != 0120000
 265         if ((mode & (_S_IFMT)) == 0120000)
 266                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 267 #endif
 268         return mode;
 269 }
 270
 271 static void send_directory(int f, struct file_list *flist, int ndx,
 272                            char *fbuf, int len, int flags);
 273
 274 static const char *flist_dir, *orig_dir;
 275 static int flist_dir_len;
 276
 277
 278 /**
 279  * Make sure @p flist is big enough to hold at least @p flist->count
 280  * entries.
 281  **/
 282 void flist_expand(struct file_list *flist)
 283 {
 284         struct file_struct **new_ptr;
 285
 286         if (flist->count < flist->malloced)
 287                 return;
 288
 289         if (flist->malloced < FLIST_START)
 290                 flist->malloced = FLIST_START;
 291         else if (flist->malloced >= FLIST_LINEAR)
 292                 flist->malloced += FLIST_LINEAR;
 293         else
 294                 flist->malloced *= 2;
 295
 296         /*
 297          * In case count jumped or we are starting the list
 298          * with a known size just set it.
 299          */
 300         if (flist->malloced < flist->count)
 301                 flist->malloced = flist->count;
 302
 303         new_ptr = realloc_array(flist->files, struct file_struct *,
 304                                 flist->malloced);
 305
 306         if (verbose >= 2 && flist->malloced != FLIST_START) {
 307                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
 308                     who_am_i(),
 309                     (double)sizeof flist->files[0] * flist->malloced,
 310                     (new_ptr == flist->files) ? " not" : "");
 311         }
 312
 313         flist->files = new_ptr;
 314
 315         if (!flist->files)
 316                 out_of_memory("flist_expand");
 317 }
 318
 319 int push_flist_dir(const char *dir, int len)
 320 {
 321         if (dir == flist_dir)
 322                 return 1;
 323
 324         if (!orig_dir)
 325                 orig_dir = strdup(curr_dir);
 326
 327         if (flist_dir && !pop_dir(orig_dir)) {
 328                 rsyserr(FERROR, errno, "pop_dir %s failed",
 329                         full_fname(orig_dir));
 330                 exit_cleanup(RERR_FILESELECT);
 331         }
 332
 333         if (dir && !push_dir(dir, 0)) {
 334                 io_error |= IOERR_GENERAL;
 335                 rsyserr(FERROR, errno, "push_dir %s failed",
 336                         full_fname(dir));
 337                 return 0;
 338         }
 339
 340         flist_dir = dir;
 341         flist_dir_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 342
 343         return 1;
 344 }
 345
 346 static void send_file_entry(struct file_struct *file, int f, int ndx)
 347 {
 348         static time_t modtime;
 349         static mode_t mode;
 350         static int64 dev;
 351         static dev_t rdev;
 352         static uint32 rdev_major;
 353         static uid_t uid;
 354         static gid_t gid;
 355         static char *user_name, *group_name;
 356         static char lastname[MAXPATHLEN];
 357         char fname[MAXPATHLEN];
 358         int first_hlink_ndx = -1;
 359         int l1, l2;
 360         int flags;
 361
 362         f_name(file, fname);
 363
 364         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 365
 366         if (file->mode == mode)
 367                 flags |= XMIT_SAME_MODE;
 368         else
 369                 mode = file->mode;
 370         if ((preserve_devices && IS_DEVICE(mode))
 371          || (preserve_specials && IS_SPECIAL(mode))) {
 372                 if (protocol_version < 28) {
 373                         if (tmp_rdev == rdev)
 374                                 flags |= XMIT_SAME_RDEV_pre28;
 375                         else
 376                                 rdev = tmp_rdev;
 377                 } else {
 378                         rdev = tmp_rdev;
 379                         if ((uint32)major(rdev) == rdev_major)
 380                                 flags |= XMIT_SAME_RDEV_MAJOR;
 381                         else
 382                                 rdev_major = major(rdev);
 383                         if ((uint32)minor(rdev) <= 0xFFu)
 384                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 385                 }
 386         } else if (protocol_version < 28)
 387                 rdev = MAKEDEV(0, 0);
 388         if (preserve_uid) {
 389                 if (F_UID(file) == uid && *lastname)
 390                         flags |= XMIT_SAME_UID;
 391                 else {
 392                         uid = F_UID(file);
 393                         if (preserve_uid && !numeric_ids) {
 394                                 user_name = add_uid(uid);
 395                                 if (incremental && user_name)
 396                                         flags |= XMIT_USER_NAME_FOLLOWS;
 397                         }
 398                 }
 399         }
 400         if (preserve_gid) {
 401                 if (F_GID(file) == gid && *lastname)
 402                         flags |= XMIT_SAME_GID;
 403                 else {
 404                         gid = F_GID(file);
 405                         if (preserve_gid && !numeric_ids) {
 406                                 group_name = add_gid(gid);
 407                                 if (incremental && group_name)
 408                                         flags |= XMIT_GROUP_NAME_FOLLOWS;
 409                         }
 410                 }
 411         }
 412         if (file->modtime == modtime)
 413                 flags |= XMIT_SAME_TIME;
 414         else
 415                 modtime = file->modtime;
 416
 417 #ifdef SUPPORT_HARD_LINKS
 418         if (tmp_dev != 0) {
 419                 if (protocol_version >= 30) {
 420                         struct idev_node *np = idev_node(tmp_dev, tmp_ino);
 421                         first_hlink_ndx = (int32)np->data - 1;
 422                         if (first_hlink_ndx < 0) {
 423                                 np->data = (void*)(ndx + 1);
 424                                 flags |= XMIT_HLINK_FIRST;
 425                         }
 426                         flags |= XMIT_HLINKED;
 427                 } else {
 428                         if (tmp_dev == dev) {
 429                                 if (protocol_version >= 28)
 430                                         flags |= XMIT_SAME_DEV_pre30;
 431                         } else
 432                                 dev = tmp_dev;
 433                         flags |= XMIT_HLINKED;
 434                 }
 435         }
 436 #endif
 437
 438         for (l1 = 0;
 439             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 440             l1++) {}
 441         l2 = strlen(fname+l1);
 442
 443         if (l1 > 0)
 444                 flags |= XMIT_SAME_NAME;
 445         if (l2 > 255)
 446                 flags |= XMIT_LONG_NAME;
 447
 448         /* We must make sure we don't send a zero flag byte or the
 449          * other end will terminate the flist transfer.  Note that
 450          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 451          * it's harmless way to add a bit to the first flag byte. */
 452         if (protocol_version >= 28) {
 453                 if (!flags && !S_ISDIR(mode))
 454                         flags |= XMIT_TOP_DIR;
 455                 if ((flags & 0xFF00) || !flags) {
 456                         flags |= XMIT_EXTENDED_FLAGS;
 457                         write_shortint(f, flags);
 458                 } else
 459                         write_byte(f, flags);
 460         } else {
 461                 if (!(flags & 0xFF))
 462                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 463                 write_byte(f, flags);
 464         }
 465         if (flags & XMIT_SAME_NAME)
 466                 write_byte(f, l1);
 467         if (flags & XMIT_LONG_NAME)
 468                 write_int(f, l2);
 469         else
 470                 write_byte(f, l2);
 471         write_buf(f, fname + l1, l2);
 472
 473         if (first_hlink_ndx >= 0) {
 474                 write_int(f, first_hlink_ndx);
 475                 goto the_end;
 476         }
 477
 478         write_longint(f, F_LENGTH(file));
 479         if (!(flags & XMIT_SAME_TIME))
 480                 write_int(f, modtime);
 481         if (!(flags & XMIT_SAME_MODE))
 482                 write_int(f, to_wire_mode(mode));
 483         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 484                 write_int(f, uid);
 485                 if (flags & XMIT_USER_NAME_FOLLOWS) {
 486                         int len = strlen(user_name);
 487                         write_byte(f, len);
 488                         write_buf(f, user_name, len);
 489                 }
 490         }
 491         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 492                 write_int(f, gid);
 493                 if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 494                         int len = strlen(group_name);
 495                         write_byte(f, len);
 496                         write_buf(f, group_name, len);
 497                 }
 498         }
 499         if ((preserve_devices && IS_DEVICE(mode))
 500          || (preserve_specials && IS_SPECIAL(mode))) {
 501                 if (protocol_version < 28) {
 502                         if (!(flags & XMIT_SAME_RDEV_pre28))
 503                                 write_int(f, (int)rdev);
 504                 } else {
 505                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 506                                 write_int(f, major(rdev));
 507                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 508                                 write_byte(f, minor(rdev));
 509                         else
 510                                 write_int(f, minor(rdev));
 511                 }
 512         }
 513
 514 #ifdef SUPPORT_LINKS
 515         if (preserve_links && S_ISLNK(mode)) {
 516                 const char *sl = F_SYMLINK(file);
 517                 int len = strlen(sl);
 518                 write_int(f, len);
 519                 write_buf(f, sl, len);
 520         }
 521 #endif
 522
 523 #ifdef SUPPORT_HARD_LINKS
 524         if (tmp_dev != 0 && protocol_version < 30) {
 525                 if (protocol_version < 26) {
 526                         /* 32-bit dev_t and ino_t */
 527                         write_int(f, (int32)dev);
 528                         write_int(f, (int32)tmp_ino);
 529                 } else {
 530                         /* 64-bit dev_t and ino_t */
 531                         if (!(flags & XMIT_SAME_DEV_pre30))
 532                                 write_longint(f, dev);
 533                         write_longint(f, tmp_ino);
 534                 }
 535         }
 536 #endif
 537
 538         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 539                 const char *sum;
 540                 if (S_ISREG(mode))
 541                         sum = tmp_sum;
 542                 else {
 543                         /* Prior to 28, we sent a useless set of nulls. */
 544                         sum = empty_sum;
 545                 }
 546                 write_buf(f, sum, checksum_len);
 547         }
 548
 549   the_end:
 550         strlcpy(lastname, fname, MAXPATHLEN);
 551 }
 552
 553 static struct file_struct *recv_file_entry(struct file_list *flist,
 554                                            int flags, int f)
 555 {
 556         static time_t modtime;
 557         static mode_t mode;
 558         static int64 dev;
 559         static dev_t rdev;
 560         static uint32 rdev_major;
 561         static uid_t uid;
 562         static gid_t gid;
 563         static char lastname[MAXPATHLEN], *lastdir;
 564         static int lastdir_depth, lastdir_len = -1;
 565         static unsigned int del_hier_name_len = 0;
 566         static int in_del_hier = 0;
 567         char thisname[MAXPATHLEN];
 568         unsigned int l1 = 0, l2 = 0;
 569         int alloc_len, basename_len, linkname_len;
 570         int extra_len = file_extra_cnt * EXTRA_LEN;
 571         int first_hlink_ndx = -1;
 572         OFF_T file_length;
 573         const char *basename;
 574         char *bp;
 575         struct file_struct *file;
 576
 577         if (flags & XMIT_SAME_NAME)
 578                 l1 = read_byte(f);
 579
 580         if (flags & XMIT_LONG_NAME)
 581                 l2 = read_int(f);
 582         else
 583                 l2 = read_byte(f);
 584
 585         if (l2 >= MAXPATHLEN - l1) {
 586                 rprintf(FERROR,
 587                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 588                         flags, l1, l2, lastname, who_am_i());
 589                 overflow_exit("recv_file_entry");
 590         }
 591
 592         strlcpy(thisname, lastname, l1 + 1);
 593         read_sbuf(f, &thisname[l1], l2);
 594         thisname[l1 + l2] = 0;
 595
 596         strlcpy(lastname, thisname, MAXPATHLEN);
 597
 598         clean_fname(thisname, 0);
 599
 600         if (sanitize_paths)
 601                 sanitize_path(thisname, thisname, "", 0, NULL);
 602
 603         if ((basename = strrchr(thisname, '/')) != NULL) {
 604                 int len = basename++ - thisname;
 605                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 606                         lastdir = new_array(char, len + 1);
 607                         memcpy(lastdir, thisname, len);
 608                         lastdir[len] = '\0';
 609                         lastdir_len = len;
 610                         lastdir_depth = count_dir_elements(lastdir);
 611                 }
 612         } else
 613                 basename = thisname;
 614         basename_len = strlen(basename) + 1; /* count the '\0' */
 615
 616 #ifdef SUPPORT_HARD_LINKS
 617         if (protocol_version >= 30
 618          && BITS_SETnUNSET(flags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 619                 struct file_struct *first;
 620                 first_hlink_ndx = read_int(f);
 621                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->count) {
 622                         rprintf(FERROR,
 623                                 "hard-link reference out of range: %d (%d)\n",
 624                                 first_hlink_ndx, flist->count);
 625                         exit_cleanup(RERR_PROTOCOL);
 626                 }
 627                 first = flist->files[first_hlink_ndx];
 628                 file_length = F_LENGTH(first);
 629                 modtime = first->modtime;
 630                 mode = first->mode;
 631                 if (preserve_uid)
 632                         uid = F_UID(first);
 633                 if (preserve_gid)
 634                         gid = F_GID(first);
 635                 if ((preserve_devices && IS_DEVICE(mode))
 636                  || (preserve_specials && IS_SPECIAL(mode))) {
 637                         uint32 *devp = F_RDEV_P(first);
 638                         rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 639                 }
 640                 if (preserve_links && S_ISLNK(mode))
 641                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 642                 else
 643                         linkname_len = 0;
 644                 goto create_object;
 645         }
 646 #endif
 647
 648         file_length = read_longint(f);
 649         if (!(flags & XMIT_SAME_TIME))
 650                 modtime = (time_t)read_int(f);
 651         if (!(flags & XMIT_SAME_MODE))
 652                 mode = from_wire_mode(read_int(f));
 653
 654         if (chmod_modes && !S_ISLNK(mode))
 655                 mode = tweak_mode(mode, chmod_modes);
 656
 657         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 658                 uid = (uid_t)read_int(f);
 659                 if (flags & XMIT_USER_NAME_FOLLOWS)
 660                         uid = recv_user_name(f, uid);
 661                 else if (incremental && am_root && !numeric_ids)
 662                         uid = match_uid(uid);
 663         }
 664         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 665                 gid = (gid_t)read_int(f);
 666                 if (flags & XMIT_GROUP_NAME_FOLLOWS)
 667                         gid = recv_group_name(f, gid);
 668                 else if (incremental && (!am_root || !numeric_ids))
 669                         gid = match_gid(gid);
 670         }
 671
 672         if ((preserve_devices && IS_DEVICE(mode))
 673          || (preserve_specials && IS_SPECIAL(mode))) {
 674                 if (protocol_version < 28) {
 675                         if (!(flags & XMIT_SAME_RDEV_pre28))
 676                                 rdev = (dev_t)read_int(f);
 677                 } else {
 678                         uint32 rdev_minor;
 679                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 680                                 rdev_major = read_int(f);
 681                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 682                                 rdev_minor = read_byte(f);
 683                         else
 684                                 rdev_minor = read_int(f);
 685                         rdev = MAKEDEV(rdev_major, rdev_minor);
 686                 }
 687                 extra_len += 2 * EXTRA_LEN;
 688                 file_length = 0;
 689         } else if (protocol_version < 28)
 690                 rdev = MAKEDEV(0, 0);
 691
 692 #ifdef SUPPORT_LINKS
 693         if (preserve_links && S_ISLNK(mode)) {
 694                 linkname_len = read_int(f) + 1; /* count the '\0' */
 695                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 696                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 697                                 linkname_len - 1);
 698                         overflow_exit("recv_file_entry");
 699                 }
 700         }
 701         else
 702 #endif
 703                 linkname_len = 0;
 704
 705 #ifdef SUPPORT_HARD_LINKS
 706   create_object:
 707         if (preserve_hard_links) {
 708                 if (protocol_version < 28 && S_ISREG(mode))
 709                         flags |= XMIT_HLINKED;
 710                 if (flags & XMIT_HLINKED)
 711                         extra_len += EXTRA_LEN;
 712         }
 713 #endif
 714
 715         if (always_checksum && S_ISREG(mode))
 716                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 717
 718         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 719                 extra_len += EXTRA_LEN;
 720
 721 #if EXTRA_ROUNDING > 0
 722         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 723                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 724 #endif
 725
 726         if (incremental && S_ISDIR(mode)) {
 727                 if (one_file_system) {
 728                         /* Room to save the dir's device for -x */
 729                         extra_len += 2 * EXTRA_LEN;
 730                 }
 731                 flist = dir_flist;
 732         }
 733
 734         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 735                   + linkname_len;
 736         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
 737
 738         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 739         bp += extra_len;
 740         file = (struct file_struct *)bp;
 741         bp += FILE_STRUCT_LEN;
 742
 743         memcpy(bp, basename, basename_len);
 744         bp += basename_len + linkname_len; /* skip space for symlink too */
 745
 746 #ifdef SUPPORT_HARD_LINKS
 747         if (flags & XMIT_HLINKED)
 748                 file->flags |= FLAG_HLINKED;
 749 #endif
 750         file->modtime = modtime;
 751         file->len32 = (uint32)file_length;
 752         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 753                 file->flags |= FLAG_LENGTH64;
 754                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 755         }
 756         file->mode = mode;
 757         if (preserve_uid)
 758                 F_UID(file) = uid;
 759         if (preserve_gid)
 760                 F_GID(file) = gid;
 761
 762         if (basename != thisname) {
 763                 file->dirname = lastdir;
 764                 F_DEPTH(file) = lastdir_depth + 1;
 765         } else
 766                 F_DEPTH(file) = 1;
 767
 768         if (S_ISDIR(mode)) {
 769                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 770                         F_DEPTH(file)--;
 771                 if (flags & XMIT_TOP_DIR) {
 772                         in_del_hier = recurse;
 773                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 774                         if (relative_paths && del_hier_name_len > 2
 775                             && lastname[del_hier_name_len-1] == '.'
 776                             && lastname[del_hier_name_len-2] == '/')
 777                                 del_hier_name_len -= 2;
 778                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 779                 } else if (in_del_hier) {
 780                         if (!relative_paths || !del_hier_name_len
 781                          || (l1 >= del_hier_name_len
 782                           && lastname[del_hier_name_len] == '/'))
 783                                 file->flags |= FLAG_XFER_DIR;
 784                         else
 785                                 in_del_hier = 0;
 786                 }
 787         }
 788
 789         if ((preserve_devices && IS_DEVICE(mode))
 790          || (preserve_specials && IS_SPECIAL(mode))) {
 791                 uint32 *devp = F_RDEV_P(file);
 792                 DEV_MAJOR(devp) = major(rdev);
 793                 DEV_MINOR(devp) = minor(rdev);
 794         }
 795
 796 #ifdef SUPPORT_LINKS
 797         if (linkname_len) {
 798                 bp = (char*)file->basename + basename_len;
 799                 if (first_hlink_ndx >= 0) {
 800                         struct file_struct *first = flist->files[first_hlink_ndx];
 801                         memcpy(bp, F_SYMLINK(first), linkname_len);
 802                 } else
 803                         read_sbuf(f, bp, linkname_len - 1);
 804                 if (sanitize_paths)
 805                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 806         }
 807 #endif
 808
 809 #ifdef SUPPORT_HARD_LINKS
 810         if (preserve_hard_links && flags & XMIT_HLINKED) {
 811                 if (protocol_version >= 30) {
 812                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 813                                         ? flist->count : first_hlink_ndx;
 814                 } else {
 815                         static int32 cnt = 0;
 816                         struct idev_node *np;
 817                         int64 ino;
 818                         int32 ndx;
 819                         if (protocol_version < 26) {
 820                                 dev = read_int(f);
 821                                 ino = read_int(f);
 822                         } else {
 823                                 if (!(flags & XMIT_SAME_DEV_pre30))
 824                                         dev = read_longint(f);
 825                                 ino = read_longint(f);
 826                         }
 827                         np = idev_node(dev, ino);
 828                         ndx = (int32)np->data - 1;
 829                         if (ndx < 0) {
 830                                 ndx = cnt++;
 831                                 np->data = (void*)cnt;
 832                         }
 833                         F_HL_GNUM(file) = ndx;
 834                 }
 835         }
 836 #endif
 837
 838         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 839                 if (S_ISREG(mode))
 840                         bp = (char*)F_SUM(file);
 841                 else {
 842                         /* Prior to 28, we get a useless set of nulls. */
 843                         bp = tmp_sum;
 844                 }
 845                 if (first_hlink_ndx >= 0) {
 846                         struct file_struct *first = flist->files[first_hlink_ndx];
 847                         memcpy(bp, F_SUM(first), checksum_len);
 848                 } else
 849                         read_buf(f, bp, checksum_len);
 850         }
 851
 852         return file;
 853 }
 854
 855 /**
 856  * Create a file_struct for a named file by reading its stat()
 857  * information and performing extensive checks against global
 858  * options.
 859  *
 860  * @return the new file, or NULL if there was an error or this file
 861  * should be excluded.
 862  *
 863  * @todo There is a small optimization opportunity here to avoid
 864  * stat()ing the file in some circumstances, which has a certain cost.
 865  * We are called immediately after doing readdir(), and so we may
 866  * already know the d_type of the file.  We could for example avoid
 867  * statting directories if we're not recursing, but this is not a very
 868  * important case.  Some systems may not have d_type.
 869  **/
 870 struct file_struct *make_file(const char *fname, struct file_list *flist,
 871                               STRUCT_STAT *stp, int flags, int filter_level)
 872 {
 873         static char *lastdir;
 874         static int lastdir_len = -1;
 875         struct file_struct *file;
 876         STRUCT_STAT st;
 877         char thisname[MAXPATHLEN];
 878         char linkname[MAXPATHLEN];
 879         int alloc_len, basename_len, linkname_len;
 880         int extra_len = file_extra_cnt * EXTRA_LEN;
 881         const char *basename;
 882         char *bp;
 883
 884         if (strlcpy(thisname, fname, sizeof thisname)
 885             >= sizeof thisname - flist_dir_len) {
 886                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 887                 return NULL;
 888         }
 889         clean_fname(thisname, 0);
 890         if (sanitize_paths)
 891                 sanitize_path(thisname, thisname, "", 0, NULL);
 892
 893         if (stp && S_ISDIR(stp->st_mode)) {
 894                 st = *stp; /* Needed for "symlink/." with --relative. */
 895                 *linkname = '\0'; /* make IBM code checker happy */
 896         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 897                 int save_errno = errno;
 898                 /* See if file is excluded before reporting an error. */
 899                 if (filter_level != NO_FILTERS
 900                  && (is_excluded(thisname, 0, filter_level)
 901                   || is_excluded(thisname, 1, filter_level))) {
 902                         if (ignore_perishable && save_errno != ENOENT)
 903                                 non_perishable_cnt++;
 904                         return NULL;
 905                 }
 906                 if (save_errno == ENOENT) {
 907 #ifdef SUPPORT_LINKS
 908                         /* Avoid "vanished" error if symlink points nowhere. */
 909                         if (copy_links && do_lstat(thisname, &st) == 0
 910                             && S_ISLNK(st.st_mode)) {
 911                                 io_error |= IOERR_GENERAL;
 912                                 rprintf(FERROR, "symlink has no referent: %s\n",
 913                                         full_fname(thisname));
 914                         } else
 915 #endif
 916                         {
 917                                 enum logcode c = am_daemon && protocol_version < 28
 918                                     ? FERROR : FINFO;
 919                                 io_error |= IOERR_VANISHED;
 920                                 rprintf(c, "file has vanished: %s\n",
 921                                         full_fname(thisname));
 922                         }
 923                 } else {
 924                         io_error |= IOERR_GENERAL;
 925                         rsyserr(FERROR, save_errno, "readlink %s failed",
 926                                 full_fname(thisname));
 927                 }
 928                 return NULL;
 929         }
 930
 931         /* backup.c calls us with filter_level set to NO_FILTERS. */
 932         if (filter_level == NO_FILTERS)
 933                 goto skip_filters;
 934
 935         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 936                 rprintf(FINFO, "skipping directory %s\n", thisname);
 937                 return NULL;
 938         }
 939
 940         /* -x only affects directories because we need to avoid recursing
 941          * into a mount-point directory, not to avoid copying a symlinked
 942          * file if -L (or similar) was specified. */
 943         if (one_file_system && st.st_dev != filesystem_dev
 944          && S_ISDIR(st.st_mode)) {
 945                 if (one_file_system > 1) {
 946                         if (verbose > 2) {
 947                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 948                                         thisname);
 949                         }
 950                         return NULL;
 951                 }
 952                 flags |= FLAG_MOUNT_DIR;
 953         }
 954
 955         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
 956                 if (ignore_perishable)
 957                         non_perishable_cnt++;
 958                 return NULL;
 959         }
 960
 961         if (lp_ignore_nonreadable(module_id)) {
 962 #ifdef SUPPORT_LINKS
 963                 if (!S_ISLNK(st.st_mode))
 964 #endif
 965                         if (access(thisname, R_OK) != 0)
 966                                 return NULL;
 967         }
 968
 969   skip_filters:
 970
 971         /* Only divert a directory in the main transfer. */
 972         if (flist && flist->prev && S_ISDIR(st.st_mode)
 973          && flags & FLAG_DIVERT_DIRS) {
 974                 flist = dir_flist;
 975                 /* Room for parent/sibling/next-child info. */
 976                 extra_len += 3 * EXTRA_LEN;
 977         }
 978
 979         if (verbose > 2) {
 980                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 981                         who_am_i(), thisname, filter_level);
 982         }
 983
 984         if ((basename = strrchr(thisname, '/')) != NULL) {
 985                 int len = basename++ - thisname;
 986                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 987                         lastdir = new_array(char, len + 1);
 988                         memcpy(lastdir, thisname, len);
 989                         lastdir[len] = '\0';
 990                         lastdir_len = len;
 991                 }
 992         } else
 993                 basename = thisname;
 994         basename_len = strlen(basename) + 1; /* count the '\0' */
 995
 996 #ifdef SUPPORT_LINKS
 997         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 998 #else
 999         linkname_len = 0;
1000 #endif
1001
1002         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1003                 extra_len += EXTRA_LEN;
1004
1005 #if EXTRA_ROUNDING > 0
1006         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1007                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1008 #endif
1009
1010         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1011                   + linkname_len;
1012         if (flist)
1013                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1014         else {
1015                 if (!(bp = new_array(char, alloc_len)))
1016                         out_of_memory("make_file");
1017         }
1018
1019         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1020         bp += extra_len;
1021         file = (struct file_struct *)bp;
1022         bp += FILE_STRUCT_LEN;
1023
1024         memcpy(bp, basename, basename_len);
1025         bp += basename_len + linkname_len; /* skip space for symlink too */
1026
1027 #ifdef SUPPORT_HARD_LINKS
1028         if (preserve_hard_links && flist && flist->prev) {
1029                 if (protocol_version >= 28
1030                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1031                  : S_ISREG(st.st_mode)) {
1032                         tmp_dev = st.st_dev;
1033                         tmp_ino = st.st_ino;
1034                 } else
1035                         tmp_dev = 0;
1036         }
1037 #endif
1038
1039 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1040         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1041                 tmp_rdev = st.st_rdev;
1042                 st.st_size = 0;
1043         }
1044 #endif
1045
1046         file->flags = flags;
1047         file->modtime = st.st_mtime;
1048         file->len32 = (uint32)st.st_size;
1049         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1050                 file->flags |= FLAG_LENGTH64;
1051                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1052         }
1053         file->mode = st.st_mode;
1054         if (preserve_uid)
1055                 F_UID(file) = st.st_uid;
1056         if (preserve_gid)
1057                 F_GID(file) = st.st_gid;
1058
1059         if (basename != thisname)
1060                 file->dirname = lastdir;
1061
1062 #ifdef SUPPORT_LINKS
1063         if (linkname_len) {
1064                 bp = (char*)file->basename + basename_len;
1065                 memcpy(bp, linkname, linkname_len);
1066         }
1067 #endif
1068
1069         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1070                 file_checksum(thisname, tmp_sum, st.st_size);
1071
1072         F_ROOTDIR(file) = flist_dir;
1073
1074         /* This code is only used by the receiver when it is building
1075          * a list of files for a delete pass. */
1076         if (keep_dirlinks && linkname_len && flist) {
1077                 STRUCT_STAT st2;
1078                 int save_mode = file->mode;
1079                 file->mode = S_IFDIR; /* Find a directory with our name. */
1080                 if (flist_find(dir_flist, file) >= 0
1081                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
1082                         file->modtime = st2.st_mtime;
1083                         file->len32 = 0;
1084                         file->mode = st2.st_mode;
1085                         if (preserve_uid)
1086                                 F_UID(file) = st2.st_uid;
1087                         if (preserve_gid)
1088                                 F_GID(file) = st2.st_gid;
1089                 } else
1090                         file->mode = save_mode;
1091         }
1092
1093         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
1094                 stats.total_size += st.st_size;
1095
1096         if (basename_len == 0+1)
1097                 return NULL;
1098
1099         if (incremental && flist == dir_flist) {
1100                 flist_expand(flist);
1101                 flist->files[flist->count++] = file;
1102         }
1103
1104         return file;
1105 }
1106
1107 /* Only called for temporary file_struct entries created by make_file(). */
1108 void unmake_file(struct file_struct *file)
1109 {
1110         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1111 #if EXTRA_ROUNDING > 0
1112         if (extra_cnt & EXTRA_ROUNDING)
1113                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1114 #endif
1115         free(REQ_EXTRA(file, extra_cnt));
1116 }
1117
1118 static struct file_struct *send_file_name(struct file_list *flist,
1119                                           char *fname, STRUCT_STAT *stp,
1120                                           int flags, int filter_flags)
1121 {
1122         struct file_struct *file;
1123
1124         file = make_file(fname, flist, stp, flags, filter_flags);
1125         if (!file)
1126                 return NULL;
1127
1128         if (chmod_modes && !S_ISLNK(file->mode))
1129                 file->mode = tweak_mode(file->mode, chmod_modes);
1130
1131         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1132
1133         flist_expand(flist);
1134         flist->files[flist->count++] = file;
1135         return file;
1136 }
1137
1138 static void send_if_directory(int f, struct file_list *flist,
1139                               struct file_struct *file,
1140                               char *fbuf, unsigned int ol,
1141                               int flags)
1142 {
1143         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1144
1145         if (S_ISDIR(file->mode)
1146             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1147                 void *save_filters;
1148                 unsigned int len = strlen(fbuf);
1149                 if (len > 1 && fbuf[len-1] == '/')
1150                         fbuf[--len] = '\0';
1151                 if (len >= MAXPATHLEN - 1) {
1152                         io_error |= IOERR_GENERAL;
1153                         rprintf(FERROR, "skipping long-named directory: %s\n",
1154                                 full_fname(fbuf));
1155                         return;
1156                 }
1157                 save_filters = push_local_filters(fbuf, len);
1158                 send_directory(f, flist, -1, fbuf, len, flags);
1159                 pop_local_filters(save_filters);
1160                 fbuf[ol] = '\0';
1161                 if (is_dot_dir)
1162                         fbuf[ol-1] = '.';
1163         }
1164 }
1165
1166 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1167 {
1168         return f_name_cmp(*file1, *file2);
1169 }
1170
1171 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1172  * sort them by name, and link them into the tree, setting the appropriate
1173  * parent/child/sibling pointers. */
1174 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1175 {
1176         int i;
1177         int32 *dp = NULL;
1178         int32 *parent_dp = parent_ndx < 0 ? NULL
1179                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1180
1181         qsort(dir_flist->files + start, end - start + 1,
1182               sizeof dir_flist->files[0], (int (*)())file_compare);
1183
1184         for (i = start; i <= end; i++) {
1185                 struct file_struct *file = dir_flist->files[i];
1186                 if (!(file->flags & FLAG_XFER_DIR)
1187                  || file->flags & FLAG_MOUNT_DIR)
1188                         continue;
1189                 if (dp)
1190                         DIR_NEXT_SIBLING(dp) = i;
1191                 else if (parent_dp)
1192                         DIR_FIRST_CHILD(parent_dp) = i;
1193                 else
1194                         send_dir_ndx = i;
1195                 dp = F_DIRNODE_P(file);
1196                 DIR_PARENT(dp) = parent_ndx;
1197                 DIR_FIRST_CHILD(dp) = -1;
1198         }
1199         if (dp)
1200                 DIR_NEXT_SIBLING(dp) = -1;
1201 }
1202
1203 /* This function is normally called by the sender, but the receiving side also
1204  * calls it from get_dirlist() with f set to -1 so that we just construct the
1205  * file list in memory without sending it over the wire.  Also, get_dirlist()
1206  * might call this with f set to -2, which also indicates that local filter
1207  * rules should be ignored. */
1208 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1209                            char *fbuf, int len, int flags)
1210 {
1211         struct dirent *di;
1212         unsigned remainder;
1213         char *p;
1214         DIR *d;
1215         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1216         int start = divert_dirs ? dir_flist->count : flist->count;
1217         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1218         struct file_struct *file;
1219
1220         assert(flist != NULL);
1221
1222         if (!(d = opendir(fbuf))) {
1223                 io_error |= IOERR_GENERAL;
1224                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1225                 return;
1226         }
1227
1228         p = fbuf + len;
1229         if (len != 1 || *fbuf != '/')
1230                 *p++ = '/';
1231         *p = '\0';
1232         remainder = MAXPATHLEN - (p - fbuf);
1233
1234         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1235                 char *dname = d_name(di);
1236                 if (dname[0] == '.' && (dname[1] == '\0'
1237                     || (dname[1] == '.' && dname[2] == '\0')))
1238                         continue;
1239                 if (strlcpy(p, dname, remainder) >= remainder) {
1240                         io_error |= IOERR_GENERAL;
1241                         rprintf(FINFO,
1242                                 "cannot send long-named file %s\n",
1243                                 full_fname(fbuf));
1244                         continue;
1245                 }
1246
1247                 file = send_file_name(flist, fbuf, NULL, flags, filter_flags);
1248                 if (file && f >= 0)
1249                         send_file_entry(file, f, flist->count - 1);
1250         }
1251
1252         fbuf[len] = '\0';
1253
1254         if (errno) {
1255                 io_error |= IOERR_GENERAL;
1256                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1257         }
1258
1259         closedir(d);
1260
1261         if (f < 0)
1262                 return;
1263
1264         if (divert_dirs)
1265                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1266         else if (recurse) {
1267                 int i, end = flist->count - 1;
1268                 /* send_if_directory() bumps flist->count, so use "end". */
1269                 for (i = start; i <= end; i++)
1270                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1271         }
1272 }
1273
1274 void send_extra_file_list(int f, int at_least)
1275 {
1276         char fbuf[MAXPATHLEN];
1277         struct file_list *flist;
1278         int64 start_write;
1279         int past_and_present, save_io_error = io_error;
1280
1281         if (send_dir_ndx < 0)
1282                 return;
1283
1284         /* Keep sending data until we have the requested number of
1285          * files in the upcoming file-lists. */
1286         past_and_present = cur_flist->ndx_start - first_flist->ndx_start
1287                          + cur_flist->count;
1288         while (file_total - past_and_present < at_least) {
1289                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1290                 int32 *dp;
1291                 int dlen;
1292
1293                 f_name(file, fbuf);
1294                 dlen = strlen(fbuf);
1295
1296                 if (F_ROOTDIR(file) != flist_dir) {
1297                         if (!push_flist_dir(F_ROOTDIR(file), -1))
1298                                 exit_cleanup(RERR_FILESELECT);
1299                 }
1300
1301                 flist = flist_new(0, "send_extra_file_list");
1302                 start_write = stats.total_written;
1303
1304                 write_int(f, NDX_FLIST_OFFSET - send_dir_ndx);
1305                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1306                 send_directory(f, flist, send_dir_ndx, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1307                 write_byte(f, 0);
1308
1309                 clean_flist(flist, 0, 0);
1310                 file_total += flist->count;
1311                 stats.flist_size += stats.total_written - start_write;
1312                 stats.num_files += flist->count;
1313                 if (verbose > 3)
1314                         output_flist(flist);
1315
1316                 dp = F_DIRNODE_P(file);
1317                 if (DIR_FIRST_CHILD(dp) >= 0) {
1318                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1319                         send_dir_depth++;
1320                 } else {
1321                         while (DIR_NEXT_SIBLING(dp) < 0) {
1322                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1323                                         write_int(f, NDX_FLIST_EOF);
1324                                         flist_eof = 1;
1325                                         change_local_filter_dir(NULL, 0, 0);
1326                                         goto finish;
1327                                 }
1328                                 send_dir_depth--;
1329                                 file = dir_flist->files[send_dir_ndx];
1330                                 dp = F_DIRNODE_P(file);
1331                         }
1332                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1333                 }
1334         }
1335
1336   finish:
1337         if (io_error != save_io_error && !ignore_errors)
1338                 send_msg_int(MSG_IO_ERROR, io_error);
1339 }
1340
1341 struct file_list *send_file_list(int f, int argc, char *argv[])
1342 {
1343         int len;
1344         STRUCT_STAT st;
1345         char *p, *dir;
1346         char lastpath[MAXPATHLEN] = "";
1347         struct file_list *flist;
1348         struct timeval start_tv, end_tv;
1349         struct file_struct *file;
1350         int64 start_write;
1351         int use_ff_fd = 0;
1352         int flags, disable_buffering;
1353
1354         rprintf(FLOG, "building file list\n");
1355         if (show_filelist_p())
1356                 start_filelist_progress("building file list");
1357
1358         start_write = stats.total_written;
1359         gettimeofday(&start_tv, NULL);
1360
1361 #ifdef SUPPORT_HARD_LINKS
1362         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1363                 init_hard_links();
1364 #endif
1365
1366         flist = cur_flist = flist_new(0, "send_file_list");
1367         if (incremental) {
1368                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1369                 flags = FLAG_DIVERT_DIRS;
1370         } else {
1371                 dir_flist = cur_flist;
1372                 flags = 0;
1373         }
1374
1375         disable_buffering = io_start_buffering_out(f);
1376         if (filesfrom_fd >= 0) {
1377                 if (argv[0] && !push_dir(argv[0], 0)) {
1378                         rsyserr(FERROR, errno, "push_dir %s failed",
1379                                 full_fname(argv[0]));
1380                         exit_cleanup(RERR_FILESELECT);
1381                 }
1382                 use_ff_fd = 1;
1383         }
1384
1385         while (1) {
1386                 char fbuf[MAXPATHLEN];
1387                 char *fn;
1388                 int is_dot_dir;
1389
1390                 if (use_ff_fd) {
1391                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1392                                 break;
1393                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1394                 } else {
1395                         if (argc-- == 0)
1396                                 break;
1397                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1398                         if (sanitize_paths)
1399                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1400                 }
1401
1402                 len = strlen(fbuf);
1403                 if (relative_paths) {
1404                         /* We clean up fbuf below. */
1405                         is_dot_dir = 0;
1406                 } else if (!len || fbuf[len - 1] == '/') {
1407                         if (len == 2 && fbuf[0] == '.') {
1408                                 /* Turn "./" into just "." rather than "./." */
1409                                 fbuf[1] = '\0';
1410                         } else {
1411                                 if (len + 1 >= MAXPATHLEN)
1412                                         overflow_exit("send_file_list");
1413                                 fbuf[len++] = '.';
1414                                 fbuf[len] = '\0';
1415                         }
1416                         is_dot_dir = 1;
1417                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1418                     && (len == 2 || fbuf[len-3] == '/')) {
1419                         if (len + 2 >= MAXPATHLEN)
1420                                 overflow_exit("send_file_list");
1421                         fbuf[len++] = '/';
1422                         fbuf[len++] = '.';
1423                         fbuf[len] = '\0';
1424                         is_dot_dir = 1;
1425                 } else {
1426                         is_dot_dir = fbuf[len-1] == '.'
1427                                    && (len == 1 || fbuf[len-2] == '/');
1428                 }
1429
1430                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1431                         io_error |= IOERR_GENERAL;
1432                         rsyserr(FERROR, errno, "link_stat %s failed",
1433                                 full_fname(fbuf));
1434                         continue;
1435                 }
1436
1437                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1438                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1439                         continue;
1440                 }
1441
1442                 dir = NULL;
1443
1444                 if (!relative_paths) {
1445                         p = strrchr(fbuf, '/');
1446                         if (p) {
1447                                 *p = '\0';
1448                                 if (p == fbuf)
1449                                         dir = "/";
1450                                 else
1451                                         dir = fbuf;
1452                                 len -= p - fbuf + 1;
1453                                 fn = p + 1;
1454                         } else
1455                                 fn = fbuf;
1456                 } else {
1457                         if ((p = strstr(fbuf, "/./")) != NULL) {
1458                                 *p = '\0';
1459                                 if (p == fbuf)
1460                                         dir = "/";
1461                                 else
1462                                         dir = fbuf;
1463                                 len -= p - fbuf + 3;
1464                                 fn = p + 3;
1465                         } else
1466                                 fn = fbuf;
1467                         /* Get rid of trailing "/" and "/.". */
1468                         while (len) {
1469                                 if (fn[len - 1] == '/') {
1470                                         is_dot_dir = 1;
1471                                         if (!--len && !dir) {
1472                                                 len++;
1473                                                 break;
1474                                         }
1475                                 }
1476                                 else if (len >= 2 && fn[len - 1] == '.'
1477                                                   && fn[len - 2] == '/') {
1478                                         is_dot_dir = 1;
1479                                         if (!(len -= 2) && !dir) {
1480                                                 len++;
1481                                                 break;
1482                                         }
1483                                 } else
1484                                         break;
1485                         }
1486                         if (len == 1 && fn[0] == '/')
1487                                 fn[len++] = '.';
1488                         fn[len] = '\0';
1489                         /* Reject a ".." dir in the active part of the path. */
1490                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1491                                 if ((p[2] == '/' || p[2] == '\0')
1492                                  && (p == fn || p[-1] == '/')) {
1493                                         rprintf(FERROR,
1494                                             "found \"..\" dir in relative path: %s\n",
1495                                             fbuf);
1496                                         exit_cleanup(RERR_SYNTAX);
1497                                 }
1498                         }
1499                 }
1500
1501                 if (!*fn) {
1502                         len = 1;
1503                         fn = ".";
1504                 }
1505
1506                 if (dir && *dir) {
1507                         static const char *lastdir;
1508                         static int lastdir_len = -1;
1509                         int len = strlen(dir);
1510
1511                         if (len != lastdir_len || memcmp(lastdir, dir, len) != 0) {
1512                                 if (!push_flist_dir(strdup(dir), len))
1513                                         goto push_error;
1514                                 lastdir = flist_dir;
1515                                 lastdir_len = flist_dir_len;
1516                         } else if (!push_flist_dir(lastdir, lastdir_len)) {
1517                           push_error:
1518                                 io_error |= IOERR_GENERAL;
1519                                 rsyserr(FERROR, errno, "push_dir %s failed",
1520                                         full_fname(dir));
1521                                 continue;
1522                         }
1523                 }
1524
1525                 if (fn != fbuf)
1526                         memmove(fbuf, fn, len + 1);
1527
1528                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1529                         /* Send the implied directories at the start of the
1530                          * source spec, so we get their permissions right. */
1531                         char *lp = lastpath, *slash = fbuf;
1532                         *p = '\0';
1533                         /* Skip any initial directories in our path that we
1534                          * have in common with lastpath. */
1535                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1536                                 if (*fn == '/')
1537                                         slash = fn;
1538                         }
1539                         *p = '/';
1540                         if (fn != p || (*lp && *lp != '/')) {
1541                                 int save_copy_links = copy_links;
1542                                 int save_xfer_dirs = xfer_dirs;
1543                                 int dir_flags = incremental ? FLAG_DIVERT_DIRS : 0;
1544                                 copy_links |= copy_unsafe_links;
1545                                 xfer_dirs = 1;
1546                                 while ((slash = strchr(slash+1, '/')) != 0) {
1547                                         *slash = '\0';
1548                                         file = send_file_name(flist, fbuf, NULL, dir_flags, ALL_FILTERS);
1549                                         if (file)
1550                                                 send_file_entry(file, f, flist->count - 1);
1551                                         *slash = '/';
1552                                 }
1553                                 copy_links = save_copy_links;
1554                                 xfer_dirs = save_xfer_dirs;
1555                                 *p = '\0';
1556                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1557                                 *p = '/';
1558                         }
1559                 }
1560
1561                 if (one_file_system)
1562                         filesystem_dev = st.st_dev;
1563
1564                 if (recurse || (xfer_dirs && is_dot_dir)) {
1565                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR
1566                                       | (is_dot_dir ? 0 : flags)
1567                                       | (incremental ? FLAG_DIVERT_DIRS : 0);
1568                         file = send_file_name(flist, fbuf, &st, top_flags, ALL_FILTERS);
1569                         if (file) {
1570                                 send_file_entry(file, f, flist->count - 1);
1571                                 if (!incremental)
1572                                         send_if_directory(f, flist, file, fbuf, len, flags);
1573                         }
1574                 } else {
1575                         file = send_file_name(flist, fbuf, &st, flags, ALL_FILTERS);
1576                         if (file)
1577                                 send_file_entry(file, f, flist->count - 1);
1578                 }
1579         }
1580
1581         gettimeofday(&end_tv, NULL);
1582         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1583                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1584         if (stats.flist_buildtime == 0)
1585                 stats.flist_buildtime = 1;
1586         start_tv = end_tv;
1587
1588         write_byte(f, 0); /* Indicate end of file list */
1589
1590 #ifdef SUPPORT_HARD_LINKS
1591         if (preserve_hard_links && protocol_version >= 30 && !incremental)
1592                 idev_destroy();
1593 #endif
1594
1595         if (show_filelist_p())
1596                 finish_filelist_progress(flist);
1597
1598         gettimeofday(&end_tv, NULL);
1599         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1600                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1601
1602         /* Sort the list without removing any duplicates in non-incremental
1603          * mode.  This allows the receiving side to ask for whatever name it
1604          * kept.  For incremental mode, the sender also removes duplicates
1605          * in this initial file-list so that it avoids re-sending duplicated
1606          * directories. */
1607         clean_flist(flist, 0, incremental);
1608         file_total += flist->count;
1609
1610         if (!numeric_ids && !incremental)
1611                 send_uid_list(f);
1612
1613         /* send the io_error flag */
1614         if (protocol_version < 30)
1615                 write_int(f, ignore_errors ? 0 : io_error);
1616         else if (io_error && !ignore_errors)
1617                 send_msg_int(MSG_IO_ERROR, io_error);
1618
1619         if (disable_buffering)
1620                 io_end_buffering_out();
1621
1622         stats.flist_size = stats.total_written - start_write;
1623         stats.num_files = flist->count;
1624
1625         if (verbose > 3)
1626                 output_flist(flist);
1627
1628         if (verbose > 2)
1629                 rprintf(FINFO, "send_file_list done\n");
1630
1631         if (incremental) {
1632                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1633                 if (file_total == 1) {
1634                         /* If we're creating incremental file-lists and there
1635                          * was just 1 item in the first file-list, send 1 more
1636                          * file-list to check if this is a 1-file xfer. */
1637                         if (send_dir_ndx < 0)
1638                                 write_int(f, NDX_DONE);
1639                         else
1640                                 send_extra_file_list(f, 1);
1641                 }
1642         }
1643
1644         return flist;
1645 }
1646
1647 struct file_list *recv_file_list(int f)
1648 {
1649         struct file_list *flist;
1650         int dstart, flags;
1651         int64 start_read;
1652
1653         if (f >= 0 && !incremental)
1654                 rprintf(FLOG, "receiving file list\n");
1655         if (show_filelist_p())
1656                 start_filelist_progress("receiving file list");
1657
1658         start_read = stats.total_read;
1659
1660         flist = flist_new(0, "recv_file_list");
1661
1662 #ifdef SUPPORT_HARD_LINKS
1663         if (preserve_hard_links && protocol_version < 30)
1664                 init_hard_links();
1665 #endif
1666
1667         if (incremental) {
1668                 if (flist->ndx_start == 0)
1669                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1670                 dstart = dir_flist->count;
1671         } else {
1672                 dir_flist = flist;
1673                 dstart = 0;
1674         }
1675
1676         while ((flags = read_byte(f)) != 0) {
1677                 struct file_struct *file;
1678
1679                 flist_expand(flist);
1680
1681                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1682                         flags |= read_byte(f) << 8;
1683                 file = recv_file_entry(flist, flags, f);
1684
1685                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1686                         stats.total_size += F_LENGTH(file);
1687
1688                 if (incremental && S_ISDIR(file->mode)) {
1689                         flist_expand(dir_flist);
1690                         dir_flist->files[dir_flist->count++] = file;
1691                 }
1692
1693                 flist->files[flist->count++] = file;
1694
1695                 maybe_emit_filelist_progress(flist->count);
1696
1697                 if (verbose > 2) {
1698                         rprintf(FINFO, "recv_file_name(%s)\n",
1699                                 f_name(file, NULL));
1700                 }
1701         }
1702         file_total += flist->count;
1703
1704         if (verbose > 2)
1705                 rprintf(FINFO, "received %d names\n", flist->count);
1706
1707         if (show_filelist_p())
1708                 finish_filelist_progress(flist);
1709
1710         clean_flist(flist, relative_paths, 1);
1711
1712         if (incremental) {
1713                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1714                       sizeof dir_flist->files[0], (int (*)())file_compare);
1715         } else if (f >= 0)
1716                 recv_uid_list(f, flist);
1717
1718         if (protocol_version < 30) {
1719                 /* Recv the io_error flag */
1720                 if (ignore_errors)
1721                         read_int(f);
1722                 else
1723                         io_error |= read_int(f);
1724         }
1725
1726         if (verbose > 3)
1727                 output_flist(flist);
1728
1729         if (list_only) {
1730                 int i;
1731                 for (i = 0; i < flist->count; i++)
1732                         list_file_entry(flist->files[i]);
1733         }
1734
1735         if (verbose > 2)
1736                 rprintf(FINFO, "recv_file_list done\n");
1737
1738         stats.flist_size += stats.total_read - start_read;
1739         stats.num_files += flist->count;
1740
1741         return flist;
1742 }
1743
1744 /* This is only used once by the receiver if the very first file-list
1745  * has exactly one item in it. */
1746 void recv_additional_file_list(int f)
1747 {
1748         struct file_list *flist;
1749         int ndx = read_int(f);
1750         if (ndx == NDX_DONE) {
1751                 flist_eof = 1;
1752                 change_local_filter_dir(NULL, 0, 0);
1753         } else {
1754                 ndx = NDX_FLIST_OFFSET - ndx;
1755                 if (ndx < 0 || ndx >= dir_flist->count) {
1756                         ndx = NDX_FLIST_OFFSET - ndx;
1757                         rprintf(FERROR,
1758                                 "Invalid dir index: %d (%d - %d)\n",
1759                                 ndx, NDX_FLIST_OFFSET,
1760                                 NDX_FLIST_OFFSET - dir_flist->count);
1761                         exit_cleanup(RERR_PROTOCOL);
1762                 }
1763                 flist = recv_file_list(f);
1764                 flist->parent_ndx = ndx;
1765         }
1766 }
1767
1768 /* Search for an identically-named item in the file list.  Note that the
1769  * items must agree in their directory-ness, or no match is returned. */
1770 int flist_find(struct file_list *flist, struct file_struct *f)
1771 {
1772         int low = flist->low, high = flist->high;
1773         int diff, mid, mid_up;
1774
1775         while (low <= high) {
1776                 mid = (low + high) / 2;
1777                 if (F_IS_ACTIVE(flist->files[mid]))
1778                         mid_up = mid;
1779                 else {
1780                         /* Scan for the next non-empty entry using the cached
1781                          * distance values.  If the value isn't fully up-to-
1782                          * date, update it. */
1783                         mid_up = mid + F_DEPTH(flist->files[mid]);
1784                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1785                                 do {
1786                                     mid_up += F_DEPTH(flist->files[mid_up]);
1787                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1788                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1789                         }
1790                         if (mid_up > high) {
1791                                 /* If there's nothing left above us, set high to
1792                                  * a non-empty entry below us and continue. */
1793                                 high = mid - (int)flist->files[mid]->len32;
1794                                 if (!F_IS_ACTIVE(flist->files[high])) {
1795                                         do {
1796                                             high -= (int)flist->files[high]->len32;
1797                                         } while (!F_IS_ACTIVE(flist->files[high]));
1798                                         flist->files[mid]->len32 = mid - high;
1799                                 }
1800                                 continue;
1801                         }
1802                 }
1803                 diff = f_name_cmp(flist->files[mid_up], f);
1804                 if (diff == 0) {
1805                         if (protocol_version < 29
1806                             && S_ISDIR(flist->files[mid_up]->mode)
1807                             != S_ISDIR(f->mode))
1808                                 return -1;
1809                         return mid_up;
1810                 }
1811                 if (diff < 0)
1812                         low = mid_up + 1;
1813                 else
1814                         high = mid - 1;
1815         }
1816         return -1;
1817 }
1818
1819 /*
1820  * Free up any resources a file_struct has allocated
1821  * and clear the file.
1822  */
1823 void clear_file(struct file_struct *file)
1824 {
1825         /* The +1 zeros out the first char of the basename. */
1826         memset(file, 0, FILE_STRUCT_LEN + 1);
1827         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1828          * entry.  Likewise for len32 in the opposite direction.  We assume
1829          * that we're alone for now since flist_find() will adjust the counts
1830          * it runs into that aren't up-to-date. */
1831         file->len32 = F_DEPTH(file) = 1;
1832 }
1833
1834 /* Allocate a new file list. */
1835 struct file_list *flist_new(int flags, char *msg)
1836 {
1837         struct file_list *flist;
1838
1839         flist = new(struct file_list);
1840         if (!flist)
1841                 out_of_memory(msg);
1842
1843         memset(flist, 0, sizeof flist[0]);
1844
1845         if (!(flags & FLIST_TEMP)) {
1846                 if (first_flist) {
1847                         flist->ndx_start = first_flist->prev->ndx_start
1848                                          + first_flist->prev->count;
1849                 }
1850                 /* This is a doubly linked list with prev looping back to
1851                  * the end of the list, but the last next pointer is NULL. */
1852                 if (!first_flist)
1853                         first_flist = cur_flist = flist->prev = flist;
1854                 else {
1855                         flist->prev = first_flist->prev;
1856                         flist->prev->next = first_flist->prev = flist;
1857                 }
1858                 flist_cnt++;
1859         }
1860
1861         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1862                 out_of_memory(msg);
1863
1864         return flist;
1865 }
1866
1867 /* Free up all elements in a flist. */
1868 void flist_free(struct file_list *flist)
1869 {
1870         if (!flist->prev)
1871                 ; /* Was FLIST_TEMP dir-list. */
1872         else if (flist == flist->prev) {
1873                 first_flist = cur_flist = NULL;
1874                 file_total = 0;
1875                 flist_cnt = 0;
1876         } else {
1877                 if (flist == cur_flist)
1878                         cur_flist = flist->next;
1879                 if (flist == first_flist)
1880                         first_flist = first_flist->next;
1881                 else {
1882                         flist->prev->next = flist->next;
1883                         if (!flist->next)
1884                                 flist->next = first_flist;
1885                 }
1886                 flist->next->prev = flist->prev;
1887                 file_total -= flist->count;
1888                 flist_cnt--;
1889         }
1890
1891         pool_destroy(flist->file_pool);
1892         free(flist->files);
1893         free(flist);
1894 }
1895
1896 /*
1897  * This routine ensures we don't have any duplicate names in our file list.
1898  * duplicate names can cause corruption because of the pipelining
1899  */
1900 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1901 {
1902         char fbuf[MAXPATHLEN];
1903         int i, prev_i = 0;
1904
1905         if (!flist)
1906                 return;
1907         if (flist->count == 0) {
1908                 flist->high = -1;
1909                 return;
1910         }
1911
1912         qsort(flist->files, flist->count,
1913             sizeof flist->files[0], (int (*)())file_compare);
1914
1915         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1916                 if (F_IS_ACTIVE(flist->files[i])) {
1917                         prev_i = i;
1918                         break;
1919                 }
1920         }
1921         flist->low = prev_i;
1922         while (++i < flist->count) {
1923                 int j;
1924                 struct file_struct *file = flist->files[i];
1925
1926                 if (!F_IS_ACTIVE(file))
1927                         continue;
1928                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1929                         j = prev_i;
1930                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1931                         int save_mode = file->mode;
1932                         /* Make sure that this directory doesn't duplicate a
1933                          * non-directory earlier in the list. */
1934                         flist->high = prev_i;
1935                         file->mode = S_IFREG;
1936                         j = flist_find(flist, file);
1937                         file->mode = save_mode;
1938                 } else
1939                         j = -1;
1940                 if (j >= 0) {
1941                         struct file_struct *fp = flist->files[j];
1942                         int keep, drop;
1943                         /* If one is a dir and the other is not, we want to
1944                          * keep the dir because it might have contents in the
1945                          * list. */
1946                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1947                                 if (S_ISDIR(file->mode))
1948                                         keep = i, drop = j;
1949                                 else
1950                                         keep = j, drop = i;
1951                         } else if (protocol_version < 27)
1952                                 keep = j, drop = i;
1953                         else
1954                                 keep = i, drop = j;
1955                         if (verbose > 1 && !am_server) {
1956                                 rprintf(FINFO,
1957                                         "removing duplicate name %s from file list (%d)\n",
1958                                         f_name(file, fbuf), drop);
1959                         }
1960                         /* Make sure we don't lose track of a user-specified
1961                          * top directory. */
1962                         flist->files[keep]->flags |= flist->files[drop]->flags
1963                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
1964
1965                         clear_file(flist->files[drop]);
1966
1967                         if (keep == i) {
1968                                 if (flist->low == drop) {
1969                                         for (j = drop + 1;
1970                                              j < i && !F_IS_ACTIVE(flist->files[j]);
1971                                              j++) {}
1972                                         flist->low = j;
1973                                 }
1974                                 prev_i = i;
1975                         }
1976                 } else
1977                         prev_i = i;
1978         }
1979         flist->high = no_dups ? prev_i : flist->count - 1;
1980
1981         if (strip_root) {
1982                 /* We need to strip off the leading slashes for relative
1983                  * paths, but this must be done _after_ the sorting phase. */
1984                 for (i = flist->low; i <= flist->high; i++) {
1985                         struct file_struct *file = flist->files[i];
1986
1987                         if (!file->dirname)
1988                                 continue;
1989                         while (*file->dirname == '/')
1990                                 file->dirname++;
1991                         if (!*file->dirname)
1992                                 file->dirname = NULL;
1993                 }
1994         }
1995
1996         if (prune_empty_dirs && no_dups) {
1997                 int j, prev_depth = 0;
1998
1999                 prev_i = 0; /* It's OK that this isn't really true. */
2000
2001                 for (i = flist->low; i <= flist->high; i++) {
2002                         struct file_struct *fp, *file = flist->files[i];
2003
2004                         /* This temporarily abuses the F_DEPTH() value for a
2005                          * directory that is in a chain that might get pruned.
2006                          * We restore the old value if it gets a reprieve. */
2007                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2008                                 /* Dump empty dirs when coming back down. */
2009                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2010                                         fp = flist->files[prev_i];
2011                                         if (F_DEPTH(fp) >= 0)
2012                                                 break;
2013                                         prev_i = -F_DEPTH(fp)-1;
2014                                         clear_file(fp);
2015                                 }
2016                                 prev_depth = F_DEPTH(file);
2017                                 if (is_excluded(f_name(file, fbuf), 1,
2018                                                        ALL_FILTERS)) {
2019                                         /* Keep dirs through this dir. */
2020                                         for (j = prev_depth-1; ; j--) {
2021                                                 fp = flist->files[prev_i];
2022                                                 if (F_DEPTH(fp) >= 0)
2023                                                         break;
2024                                                 prev_i = -F_DEPTH(fp)-1;
2025                                                 F_DEPTH(fp) = j;
2026                                         }
2027                                 } else
2028                                         F_DEPTH(file) = -prev_i-1;
2029                                 prev_i = i;
2030                         } else {
2031                                 /* Keep dirs through this non-dir. */
2032                                 for (j = prev_depth; ; j--) {
2033                                         fp = flist->files[prev_i];
2034                                         if (F_DEPTH(fp) >= 0)
2035                                                 break;
2036                                         prev_i = -F_DEPTH(fp)-1;
2037                                         F_DEPTH(fp) = j;
2038                                 }
2039                         }
2040                 }
2041                 /* Dump empty all remaining empty dirs. */
2042                 while (1) {
2043                         struct file_struct *fp = flist->files[prev_i];
2044                         if (F_DEPTH(fp) >= 0)
2045                                 break;
2046                         prev_i = -F_DEPTH(fp)-1;
2047                         clear_file(fp);
2048                 }
2049
2050                 for (i = flist->low; i <= flist->high; i++) {
2051                         if (F_IS_ACTIVE(flist->files[i]))
2052                                 break;
2053                 }
2054                 flist->low = i;
2055                 for (i = flist->high; i >= flist->low; i--) {
2056                         if (F_IS_ACTIVE(flist->files[i]))
2057                                 break;
2058                 }
2059                 flist->high = i;
2060         }
2061 }
2062
2063 static void output_flist(struct file_list *flist)
2064 {
2065         char uidbuf[16], gidbuf[16], depthbuf[16];
2066         struct file_struct *file;
2067         const char *root, *dir, *slash, *name, *trail;
2068         const char *who = who_am_i();
2069         int i;
2070
2071         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2072                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2073         for (i = 0; i < flist->count; i++) {
2074                 file = flist->files[i];
2075                 if ((am_root || am_sender) && preserve_uid) {
2076                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2077                                  (long)F_UID(file));
2078                 } else
2079                         *uidbuf = '\0';
2080                 if (preserve_gid && F_GID(file) != GID_NONE) {
2081                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2082                                  (long)F_GID(file));
2083                 } else
2084                         *gidbuf = '\0';
2085                 if (!am_sender)
2086                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2087                 if (F_IS_ACTIVE(file)) {
2088                         root = am_sender ? NS(F_ROOTDIR(file)) : depthbuf;
2089                         if ((dir = file->dirname) == NULL)
2090                                 dir = slash = "";
2091                         else
2092                                 slash = "/";
2093                         name = file->basename;
2094                         trail = S_ISDIR(file->mode) ? "/" : "";
2095                 } else
2096                         root = dir = slash = name = trail = "";
2097                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2098                         who, i, root, dir, slash, name, trail, (int)file->mode,
2099                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2100         }
2101 }
2102
2103 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2104 enum fnc_type { t_PATH, t_ITEM };
2105
2106 /* Compare the names of two file_struct entities, similar to how strcmp()
2107  * would do if it were operating on the joined strings.
2108  *
2109  * Some differences beginning with protocol_version 29: (1) directory names
2110  * are compared with an assumed trailing slash so that they compare in a
2111  * way that would cause them to sort immediately prior to any content they
2112  * may have; (2) a directory of any name compares after a non-directory of
2113  * any name at the same depth; (3) a directory with name "." compares prior
2114  * to anything else.  These changes mean that a directory and a non-dir
2115  * with the same name will not compare as equal (protocol_version >= 29).
2116  *
2117  * The dirname component can be an empty string, but the basename component
2118  * cannot (and never is in the current codebase).  The basename component
2119  * may be NULL (for a removed item), in which case it is considered to be
2120  * after any existing item. */
2121 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2122 {
2123         int dif;
2124         const uchar *c1, *c2;
2125         enum fnc_state state1, state2;
2126         enum fnc_type type1, type2;
2127         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2128
2129         if (!f1 || !F_IS_ACTIVE(f1)) {
2130                 if (!f2 || !F_IS_ACTIVE(f2))
2131                         return 0;
2132                 return -1;
2133         }
2134         if (!f2 || !F_IS_ACTIVE(f2))
2135                 return 1;
2136
2137         c1 = (uchar*)f1->dirname;
2138         c2 = (uchar*)f2->dirname;
2139         if (c1 == c2)
2140                 c1 = c2 = NULL;
2141         if (!c1) {
2142                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2143                 c1 = (const uchar*)f1->basename;
2144                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2145                         type1 = t_ITEM;
2146                         state1 = s_TRAILING;
2147                         c1 = (uchar*)"";
2148                 } else
2149                         state1 = s_BASE;
2150         } else {
2151                 type1 = t_path;
2152                 state1 = s_DIR;
2153         }
2154         if (!c2) {
2155                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2156                 c2 = (const uchar*)f2->basename;
2157                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2158                         type2 = t_ITEM;
2159                         state2 = s_TRAILING;
2160                         c2 = (uchar*)"";
2161                 } else
2162                         state2 = s_BASE;
2163         } else {
2164                 type2 = t_path;
2165                 state2 = s_DIR;
2166         }
2167
2168         if (type1 != type2)
2169                 return type1 == t_PATH ? 1 : -1;
2170
2171         do {
2172                 if (!*c1) {
2173                         switch (state1) {
2174                         case s_DIR:
2175                                 state1 = s_SLASH;
2176                                 c1 = (uchar*)"/";
2177                                 break;
2178                         case s_SLASH:
2179                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2180                                 c1 = (const uchar*)f1->basename;
2181                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2182                                         type1 = t_ITEM;
2183                                         state1 = s_TRAILING;
2184                                         c1 = (uchar*)"";
2185                                 } else
2186                                         state1 = s_BASE;
2187                                 break;
2188                         case s_BASE:
2189                                 state1 = s_TRAILING;
2190                                 if (type1 == t_PATH) {
2191                                         c1 = (uchar*)"/";
2192                                         break;
2193                                 }
2194                                 /* FALL THROUGH */
2195                         case s_TRAILING:
2196                                 type1 = t_ITEM;
2197                                 break;
2198                         }
2199                         if (*c2 && type1 != type2)
2200                                 return type1 == t_PATH ? 1 : -1;
2201                 }
2202                 if (!*c2) {
2203                         switch (state2) {
2204                         case s_DIR:
2205                                 state2 = s_SLASH;
2206                                 c2 = (uchar*)"/";
2207                                 break;
2208                         case s_SLASH:
2209                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2210                                 c2 = (const uchar*)f2->basename;
2211                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2212                                         type2 = t_ITEM;
2213                                         state2 = s_TRAILING;
2214                                         c2 = (uchar*)"";
2215                                 } else
2216                                         state2 = s_BASE;
2217                                 break;
2218                         case s_BASE:
2219                                 state2 = s_TRAILING;
2220                                 if (type2 == t_PATH) {
2221                                         c2 = (uchar*)"/";
2222                                         break;
2223                                 }
2224                                 /* FALL THROUGH */
2225                         case s_TRAILING:
2226                                 if (!*c1)
2227                                         return 0;
2228                                 type2 = t_ITEM;
2229                                 break;
2230                         }
2231                         if (type1 != type2)
2232                                 return type1 == t_PATH ? 1 : -1;
2233                 }
2234         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2235
2236         return dif;
2237 }
2238
2239 char *f_name_buf(void)
2240 {
2241         static char names[5][MAXPATHLEN];
2242         static unsigned int n;
2243
2244         n = (n + 1) % (sizeof names / sizeof names[0]);
2245
2246         return names[n];
2247 }
2248
2249 /* Return a copy of the full filename of a flist entry, using the indicated
2250  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2251  * done because we checked the size when creating the file_struct entry.
2252  */
2253 char *f_name(struct file_struct *f, char *fbuf)
2254 {
2255         if (!f || !F_IS_ACTIVE(f))
2256                 return NULL;
2257
2258         if (!fbuf)
2259                 fbuf = f_name_buf();
2260
2261         if (f->dirname) {
2262                 int len = strlen(f->dirname);
2263                 memcpy(fbuf, f->dirname, len);
2264                 fbuf[len] = '/';
2265                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2266         } else
2267                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2268
2269         return fbuf;
2270 }
2271
2272 /* Do a non-recursive scan of the named directory, possibly ignoring all
2273  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2274  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2275  * buffer (the functions we call will append names onto the end, but the old
2276  * dir value will be restored on exit). */
2277 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2278 {
2279         struct file_list *dirlist;
2280         char dirbuf[MAXPATHLEN];
2281         int save_recurse = recurse;
2282         int save_xfer_dirs = xfer_dirs;
2283
2284         if (dlen < 0) {
2285                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2286                 if (dlen >= MAXPATHLEN)
2287                         return NULL;
2288                 dirname = dirbuf;
2289         }
2290
2291         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2292
2293         recurse = 0;
2294         xfer_dirs = 1;
2295         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2296         xfer_dirs = save_xfer_dirs;
2297         recurse = save_recurse;
2298         if (do_progress)
2299                 flist_count_offset += dirlist->count;
2300
2301         clean_flist(dirlist, 0, 0);
2302
2303         if (verbose > 3)
2304                 output_flist(dirlist);
2305
2306         return dirlist;
2307 }