flist.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /** @file flist.c
  22  * Generate and receive file lists
  23  *
  24  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
  25  *
  26  **/
  27
  28 #include "rsync.h"
  29
  30 extern int verbose;
  31 extern int dry_run;
  32 extern int list_only;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_daemon;
  36 extern int am_sender;
  37 extern int do_progress;
  38 extern int always_checksum;
  39 extern int module_id;
  40 extern int ignore_errors;
  41 extern int numeric_ids;
  42 extern int recurse;
  43 extern int xfer_dirs;
  44 extern int filesfrom_fd;
  45 extern int one_file_system;
  46 extern int keep_dirlinks;
  47 extern int preserve_links;
  48 extern int preserve_hard_links;
  49 extern int preserve_perms;
  50 extern int preserve_devices;
  51 extern int preserve_uid;
  52 extern int preserve_gid;
  53 extern int relative_paths;
  54 extern int implied_dirs;
  55 extern int copy_links;
  56 extern int copy_unsafe_links;
  57 extern int protocol_version;
  58 extern int sanitize_paths;
  59 extern int orig_umask;
  60 extern struct stats stats;
  61 extern struct file_list *the_file_list;
  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 static char empty_sum[MD4_SUM_LENGTH];
  75 static int flist_count_offset;
  76 static unsigned int file_struct_len;
  77
  78 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  79 static void output_flist(struct file_list *flist);
  80
  81 void init_flist(void)
  82 {
  83         struct file_struct f;
  84
  85         /* Figure out how big the file_struct is without trailing padding */
  86         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  87         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
  88 }
  89
  90 static int show_filelist_p(void)
  91 {
  92         return verbose && xfer_dirs && !am_server;
  93 }
  94
  95 static void start_filelist_progress(char *kind)
  96 {
  97         rprintf(FINFO, "%s ... ", kind);
  98         if (verbose > 1 || do_progress)
  99                 rprintf(FINFO, "\n");
 100         rflush(FINFO);
 101 }
 102
 103 static void emit_filelist_progress(int count)
 104 {
 105         rprintf(FINFO, " %d files...\r", count);
 106 }
 107
 108 static void maybe_emit_filelist_progress(int count)
 109 {
 110         if (do_progress && show_filelist_p() && (count % 100) == 0)
 111                 emit_filelist_progress(count);
 112 }
 113
 114 static void finish_filelist_progress(const struct file_list *flist)
 115 {
 116         if (do_progress) {
 117                 /* This overwrites the progress line */
 118                 rprintf(FINFO, "%d file%sto consider\n",
 119                         flist->count, flist->count == 1 ? " " : "s ");
 120         } else
 121                 rprintf(FINFO, "done\n");
 122 }
 123
 124 void show_flist_stats(void)
 125 {
 126         /* Nothing yet */
 127 }
 128
 129 static void list_file_entry(struct file_struct *f)
 130 {
 131         char perms[11];
 132
 133         if (!f->basename) {
 134                 /* this can happen if duplicate names were removed */
 135                 return;
 136         }
 137
 138         permstring(perms, f->mode);
 139
 140 #ifdef SUPPORT_LINKS
 141         if (preserve_links && S_ISLNK(f->mode)) {
 142                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 143                         perms,
 144                         (double)f->length, timestring(f->modtime),
 145                         f_name(f, NULL), f->u.link);
 146         } else
 147 #endif
 148         {
 149                 rprintf(FINFO, "%s %11.0f %s %s\n",
 150                         perms,
 151                         (double)f->length, timestring(f->modtime),
 152                         f_name(f, NULL));
 153         }
 154 }
 155
 156 /**
 157  * Stat either a symlink or its referent, depending on the settings of
 158  * copy_links, copy_unsafe_links, etc.
 159  *
 160  * @retval -1 on error
 161  *
 162  * @retval 0 for success
 163  *
 164  * @post If @p path is a symlink, then @p linkbuf (of size @c
 165  * MAXPATHLEN) contains the symlink target.
 166  *
 167  * @post @p buffer contains information about the link or the
 168  * referrent as appropriate, if they exist.
 169  **/
 170 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 171 {
 172 #ifdef SUPPORT_LINKS
 173         if (copy_links)
 174                 return do_stat(path, buffer);
 175         if (link_stat(path, buffer, 0) < 0)
 176                 return -1;
 177         if (S_ISLNK(buffer->st_mode)) {
 178                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 179                 if (l == -1)
 180                         return -1;
 181                 linkbuf[l] = 0;
 182                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 183                         if (verbose > 1) {
 184                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 185                                         path, linkbuf);
 186                         }
 187                         return do_stat(path, buffer);
 188                 }
 189         }
 190         return 0;
 191 #else
 192         return do_stat(path, buffer);
 193 #endif
 194 }
 195
 196 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 197 {
 198 #ifdef SUPPORT_LINKS
 199         if (copy_links)
 200                 return do_stat(path, buffer);
 201         if (do_lstat(path, buffer) < 0)
 202                 return -1;
 203         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 204                 STRUCT_STAT st;
 205                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 206                         *buffer = st;
 207         }
 208         return 0;
 209 #else
 210         return do_stat(path, buffer);
 211 #endif
 212 }
 213
 214 /* This function is used to check if a file should be included/excluded
 215  * from the list of files based on its name and type etc.  The value of
 216  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 217 static int is_excluded(char *fname, int is_dir, int filter_level)
 218 {
 219 #if 0 /* This currently never happens, so avoid a useless compare. */
 220         if (filter_level == NO_FILTERS)
 221                 return 0;
 222 #endif
 223         if (fname) {
 224                 /* never exclude '.', even if somebody does --exclude '*' */
 225                 if (fname[0] == '.' && !fname[1])
 226                         return 0;
 227                 /* Handle the -R version of the '.' dir. */
 228                 if (fname[0] == '/') {
 229                         int len = strlen(fname);
 230                         if (fname[len-1] == '.' && fname[len-2] == '/')
 231                                 return 0;
 232                 }
 233         }
 234         if (server_filter_list.head
 235             && check_filter(&server_filter_list, fname, is_dir) < 0)
 236                 return 1;
 237         if (filter_level != ALL_FILTERS)
 238                 return 0;
 239         if (filter_list.head
 240             && check_filter(&filter_list, fname, is_dir) < 0)
 241                 return 1;
 242         return 0;
 243 }
 244
 245 static int to_wire_mode(mode_t mode)
 246 {
 247 #ifdef SUPPORT_LINKS
 248         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 249                 return (mode & ~(_S_IFMT)) | 0120000;
 250 #endif
 251         return (int)mode;
 252 }
 253
 254 static mode_t from_wire_mode(int mode)
 255 {
 256         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 257                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 258         return (mode_t)mode;
 259 }
 260
 261 static void send_directory(int f, struct file_list *flist,
 262                            char *fbuf, int len);
 263
 264 static char *flist_dir;
 265 static int flist_dir_len;
 266
 267
 268 /**
 269  * Make sure @p flist is big enough to hold at least @p flist->count
 270  * entries.
 271  **/
 272 void flist_expand(struct file_list *flist)
 273 {
 274         struct file_struct **new_ptr;
 275
 276         if (flist->count < flist->malloced)
 277                 return;
 278
 279         if (flist->malloced < FLIST_START)
 280                 flist->malloced = FLIST_START;
 281         else if (flist->malloced >= FLIST_LINEAR)
 282                 flist->malloced += FLIST_LINEAR;
 283         else
 284                 flist->malloced *= 2;
 285
 286         /*
 287          * In case count jumped or we are starting the list
 288          * with a known size just set it.
 289          */
 290         if (flist->malloced < flist->count)
 291                 flist->malloced = flist->count;
 292
 293         new_ptr = realloc_array(flist->files, struct file_struct *,
 294                                 flist->malloced);
 295
 296         if (verbose >= 2 && flist->malloced != FLIST_START) {
 297                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 298                     who_am_i(),
 299                     (double)sizeof flist->files[0] * flist->malloced,
 300                     (new_ptr == flist->files) ? " not" : "");
 301         }
 302
 303         flist->files = new_ptr;
 304
 305         if (!flist->files)
 306                 out_of_memory("flist_expand");
 307 }
 308
 309 static void send_file_entry(struct file_struct *file, int f)
 310 {
 311         unsigned short flags;
 312         static time_t modtime;
 313         static mode_t mode;
 314         static int64 dev;
 315         static dev_t rdev;
 316         static uint32 rdev_major;
 317         static uid_t uid;
 318         static gid_t gid;
 319         static char lastname[MAXPATHLEN];
 320         char fname[MAXPATHLEN];
 321         int l1, l2;
 322
 323         if (f < 0)
 324                 return;
 325
 326         if (!file) {
 327                 write_byte(f, 0);
 328                 modtime = 0, mode = 0;
 329                 dev = 0, rdev = makedev(0, 0);
 330                 rdev_major = 0;
 331                 uid = 0, gid = 0;
 332                 *lastname = '\0';
 333                 return;
 334         }
 335
 336         io_write_phase = "send_file_entry";
 337
 338         f_name(file, fname);
 339
 340         flags = file->flags & XMIT_TOP_DIR;
 341
 342         if (file->mode == mode)
 343                 flags |= XMIT_SAME_MODE;
 344         else
 345                 mode = file->mode;
 346         if (preserve_devices) {
 347                 if (protocol_version < 28) {
 348                         if (IS_DEVICE(mode)) {
 349                                 if (file->u.rdev == rdev)
 350                                         flags |= XMIT_SAME_RDEV_pre28;
 351                                 else
 352                                         rdev = file->u.rdev;
 353                         } else
 354                                 rdev = makedev(0, 0);
 355                 } else if (IS_DEVICE(mode)) {
 356                         rdev = file->u.rdev;
 357                         if ((uint32)major(rdev) == rdev_major)
 358                                 flags |= XMIT_SAME_RDEV_MAJOR;
 359                         else
 360                                 rdev_major = major(rdev);
 361                         if ((uint32)minor(rdev) <= 0xFFu)
 362                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 363                 }
 364         }
 365         if (file->uid == uid)
 366                 flags |= XMIT_SAME_UID;
 367         else
 368                 uid = file->uid;
 369         if (file->gid == gid)
 370                 flags |= XMIT_SAME_GID;
 371         else
 372                 gid = file->gid;
 373         if (file->modtime == modtime)
 374                 flags |= XMIT_SAME_TIME;
 375         else
 376                 modtime = file->modtime;
 377
 378 #ifdef SUPPORT_HARD_LINKS
 379         if (file->link_u.idev) {
 380                 if (file->F_DEV == dev) {
 381                         if (protocol_version >= 28)
 382                                 flags |= XMIT_SAME_DEV;
 383                 } else
 384                         dev = file->F_DEV;
 385                 flags |= XMIT_HAS_IDEV_DATA;
 386         }
 387 #endif
 388
 389         for (l1 = 0;
 390             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 391             l1++) {}
 392         l2 = strlen(fname+l1);
 393
 394         if (l1 > 0)
 395                 flags |= XMIT_SAME_NAME;
 396         if (l2 > 255)
 397                 flags |= XMIT_LONG_NAME;
 398
 399         /* We must make sure we don't send a zero flag byte or the
 400          * other end will terminate the flist transfer.  Note that
 401          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 402          * it's harmless way to add a bit to the first flag byte. */
 403         if (protocol_version >= 28) {
 404                 if (!flags && !S_ISDIR(mode))
 405                         flags |= XMIT_TOP_DIR;
 406                 if ((flags & 0xFF00) || !flags) {
 407                         flags |= XMIT_EXTENDED_FLAGS;
 408                         write_byte(f, flags);
 409                         write_byte(f, flags >> 8);
 410                 } else
 411                         write_byte(f, flags);
 412         } else {
 413                 if (!(flags & 0xFF))
 414                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 415                 write_byte(f, flags);
 416         }
 417         if (flags & XMIT_SAME_NAME)
 418                 write_byte(f, l1);
 419         if (flags & XMIT_LONG_NAME)
 420                 write_int(f, l2);
 421         else
 422                 write_byte(f, l2);
 423         write_buf(f, fname + l1, l2);
 424
 425         write_longint(f, file->length);
 426         if (!(flags & XMIT_SAME_TIME))
 427                 write_int(f, modtime);
 428         if (!(flags & XMIT_SAME_MODE))
 429                 write_int(f, to_wire_mode(mode));
 430         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 431                 if (!numeric_ids)
 432                         add_uid(uid);
 433                 write_int(f, uid);
 434         }
 435         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 436                 if (!numeric_ids)
 437                         add_gid(gid);
 438                 write_int(f, gid);
 439         }
 440         if (preserve_devices && IS_DEVICE(mode)) {
 441                 if (protocol_version < 28) {
 442                         if (!(flags & XMIT_SAME_RDEV_pre28))
 443                                 write_int(f, (int)rdev);
 444                 } else {
 445                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 446                                 write_int(f, major(rdev));
 447                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 448                                 write_byte(f, minor(rdev));
 449                         else
 450                                 write_int(f, minor(rdev));
 451                 }
 452         }
 453
 454 #ifdef SUPPORT_LINKS
 455         if (preserve_links && S_ISLNK(mode)) {
 456                 int len = strlen(file->u.link);
 457                 write_int(f, len);
 458                 write_buf(f, file->u.link, len);
 459         }
 460 #endif
 461
 462 #ifdef SUPPORT_HARD_LINKS
 463         if (flags & XMIT_HAS_IDEV_DATA) {
 464                 if (protocol_version < 26) {
 465                         /* 32-bit dev_t and ino_t */
 466                         write_int(f, dev);
 467                         write_int(f, file->F_INODE);
 468                 } else {
 469                         /* 64-bit dev_t and ino_t */
 470                         if (!(flags & XMIT_SAME_DEV))
 471                                 write_longint(f, dev);
 472                         write_longint(f, file->F_INODE);
 473                 }
 474         }
 475 #endif
 476
 477         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 478                 char *sum;
 479                 if (S_ISREG(mode))
 480                         sum = file->u.sum;
 481                 else {
 482                         /* Prior to 28, we sent a useless set of nulls. */
 483                         sum = empty_sum;
 484                 }
 485                 write_buf(f, sum, checksum_len);
 486         }
 487
 488         strlcpy(lastname, fname, MAXPATHLEN);
 489
 490         io_write_phase = "unknown";
 491 }
 492
 493 static struct file_struct *receive_file_entry(struct file_list *flist,
 494                                               unsigned short flags, int f)
 495 {
 496         static time_t modtime;
 497         static mode_t mode;
 498         static int64 dev;
 499         static dev_t rdev;
 500         static uint32 rdev_major;
 501         static uid_t uid;
 502         static gid_t gid;
 503         static char lastname[MAXPATHLEN], *lastdir;
 504         static int lastdir_depth, lastdir_len = -1;
 505         static unsigned int del_hier_name_len = 0;
 506         static int in_del_hier = 0;
 507         char thisname[MAXPATHLEN];
 508         unsigned int l1 = 0, l2 = 0;
 509         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 510         OFF_T file_length;
 511         char *basename, *dirname, *bp;
 512         struct file_struct *file;
 513
 514         if (!flist) {
 515                 modtime = 0, mode = 0;
 516                 dev = 0, rdev = makedev(0, 0);
 517                 rdev_major = 0;
 518                 uid = 0, gid = 0;
 519                 *lastname = '\0';
 520                 lastdir_len = -1;
 521                 in_del_hier = 0;
 522                 return NULL;
 523         }
 524
 525         if (flags & XMIT_SAME_NAME)
 526                 l1 = read_byte(f);
 527
 528         if (flags & XMIT_LONG_NAME)
 529                 l2 = read_int(f);
 530         else
 531                 l2 = read_byte(f);
 532
 533         if (l2 >= MAXPATHLEN - l1) {
 534                 rprintf(FERROR,
 535                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 536                         flags, l1, l2, lastname);
 537                 overflow_exit("receive_file_entry");
 538         }
 539
 540         strlcpy(thisname, lastname, l1 + 1);
 541         read_sbuf(f, &thisname[l1], l2);
 542         thisname[l1 + l2] = 0;
 543
 544         strlcpy(lastname, thisname, MAXPATHLEN);
 545
 546         clean_fname(thisname, 0);
 547
 548         if (sanitize_paths)
 549                 sanitize_path(thisname, thisname, "", 0);
 550
 551         if ((basename = strrchr(thisname, '/')) != NULL) {
 552                 dirname_len = ++basename - thisname; /* counts future '\0' */
 553                 if (lastdir_len == dirname_len - 1
 554                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 555                         dirname = lastdir;
 556                         dirname_len = 0; /* indicates no copy is needed */
 557                 } else
 558                         dirname = thisname;
 559         } else {
 560                 basename = thisname;
 561                 dirname = NULL;
 562                 dirname_len = 0;
 563         }
 564         basename_len = strlen(basename) + 1; /* count the '\0' */
 565
 566         file_length = read_longint(f);
 567         if (!(flags & XMIT_SAME_TIME))
 568                 modtime = (time_t)read_int(f);
 569         if (!(flags & XMIT_SAME_MODE))
 570                 mode = from_wire_mode(read_int(f));
 571
 572         if (preserve_uid && !(flags & XMIT_SAME_UID))
 573                 uid = (uid_t)read_int(f);
 574         if (preserve_gid && !(flags & XMIT_SAME_GID))
 575                 gid = (gid_t)read_int(f);
 576
 577         if (preserve_devices) {
 578                 if (protocol_version < 28) {
 579                         if (IS_DEVICE(mode)) {
 580                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 581                                         rdev = (dev_t)read_int(f);
 582                         } else
 583                                 rdev = makedev(0, 0);
 584                 } else if (IS_DEVICE(mode)) {
 585                         uint32 rdev_minor;
 586                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 587                                 rdev_major = read_int(f);
 588                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 589                                 rdev_minor = read_byte(f);
 590                         else
 591                                 rdev_minor = read_int(f);
 592                         rdev = makedev(rdev_major, rdev_minor);
 593                 }
 594         }
 595
 596 #ifdef SUPPORT_LINKS
 597         if (preserve_links && S_ISLNK(mode)) {
 598                 linkname_len = read_int(f) + 1; /* count the '\0' */
 599                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 600                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 601                                 linkname_len - 1);
 602                         overflow_exit("receive_file_entry");
 603                 }
 604         }
 605         else
 606 #endif
 607                 linkname_len = 0;
 608
 609         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 610
 611         alloc_len = file_struct_len + dirname_len + basename_len
 612                   + linkname_len + sum_len;
 613         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 614
 615         file = (struct file_struct *)bp;
 616         memset(bp, 0, file_struct_len);
 617         bp += file_struct_len;
 618
 619         file->flags = 0;
 620         file->modtime = modtime;
 621         file->length = file_length;
 622         file->mode = mode;
 623         file->uid = uid;
 624         file->gid = gid;
 625
 626         if (dirname_len) {
 627                 file->dirname = lastdir = bp;
 628                 lastdir_len = dirname_len - 1;
 629                 memcpy(bp, dirname, dirname_len - 1);
 630                 bp += dirname_len;
 631                 bp[-1] = '\0';
 632                 lastdir_depth = count_dir_elements(lastdir);
 633                 file->dir.depth = lastdir_depth + 1;
 634         } else if (dirname) {
 635                 file->dirname = dirname; /* we're reusing lastname */
 636                 file->dir.depth = lastdir_depth + 1;
 637         } else
 638                 file->dir.depth = 1;
 639
 640         if (S_ISDIR(mode)) {
 641                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 642                         file->dir.depth--;
 643                 if (flags & XMIT_TOP_DIR) {
 644                         in_del_hier = recurse;
 645                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 646                         if (relative_paths && del_hier_name_len > 2
 647                             && basename_len == 1+1 && *basename == '.')
 648                                 del_hier_name_len -= 2;
 649                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 650                 } else if (in_del_hier) {
 651                         if (!relative_paths || !del_hier_name_len
 652                          || (l1 >= del_hier_name_len
 653                           && thisname[del_hier_name_len] == '/'))
 654                                 file->flags |= FLAG_DEL_HERE;
 655                         else
 656                                 in_del_hier = 0;
 657                 }
 658         }
 659
 660         file->basename = bp;
 661         memcpy(bp, basename, basename_len);
 662         bp += basename_len;
 663
 664         if (preserve_devices && IS_DEVICE(mode))
 665                 file->u.rdev = rdev;
 666
 667 #ifdef SUPPORT_LINKS
 668         if (linkname_len) {
 669                 file->u.link = bp;
 670                 read_sbuf(f, bp, linkname_len - 1);
 671                 if (sanitize_paths)
 672                         sanitize_path(bp, bp, "", lastdir_depth);
 673                 bp += linkname_len;
 674         }
 675 #endif
 676
 677 #ifdef SUPPORT_HARD_LINKS
 678         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 679                 flags |= XMIT_HAS_IDEV_DATA;
 680         if (flags & XMIT_HAS_IDEV_DATA) {
 681                 int64 inode;
 682                 if (protocol_version < 26) {
 683                         dev = read_int(f);
 684                         inode = read_int(f);
 685                 } else {
 686                         if (!(flags & XMIT_SAME_DEV))
 687                                 dev = read_longint(f);
 688                         inode = read_longint(f);
 689                 }
 690                 if (flist->hlink_pool) {
 691                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 692                             struct idev, 1, "inode_table");
 693                         file->F_INODE = inode;
 694                         file->F_DEV = dev;
 695                 }
 696         }
 697 #endif
 698
 699         if (always_checksum && (sum_len || protocol_version < 28)) {
 700                 char *sum;
 701                 if (sum_len) {
 702                         file->u.sum = sum = bp;
 703                         /*bp += sum_len;*/
 704                 } else {
 705                         /* Prior to 28, we get a useless set of nulls. */
 706                         sum = empty_sum;
 707                 }
 708                 read_buf(f, sum, checksum_len);
 709         }
 710
 711         if (!preserve_perms) {
 712                 /* set an appropriate set of permissions based on original
 713                  * permissions and umask. This emulates what GNU cp does */
 714                 file->mode &= ~orig_umask;
 715         }
 716
 717         return file;
 718 }
 719
 720 /**
 721  * Create a file_struct for a named file by reading its stat()
 722  * information and performing extensive checks against global
 723  * options.
 724  *
 725  * @return the new file, or NULL if there was an error or this file
 726  * should be excluded.
 727  *
 728  * @todo There is a small optimization opportunity here to avoid
 729  * stat()ing the file in some circumstances, which has a certain cost.
 730  * We are called immediately after doing readdir(), and so we may
 731  * already know the d_type of the file.  We could for example avoid
 732  * statting directories if we're not recursing, but this is not a very
 733  * important case.  Some systems may not have d_type.
 734  **/
 735 struct file_struct *make_file(char *fname, struct file_list *flist,
 736                               STRUCT_STAT *stp, unsigned short flags,
 737                               int filter_level)
 738 {
 739         static char *lastdir;
 740         static int lastdir_len = -1;
 741         struct file_struct *file;
 742         STRUCT_STAT st;
 743         char sum[SUM_LENGTH];
 744         char thisname[MAXPATHLEN];
 745         char linkname[MAXPATHLEN];
 746         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 747         char *basename, *dirname, *bp;
 748
 749         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 750                 lastdir_len = -1;
 751
 752         if (strlcpy(thisname, fname, sizeof thisname)
 753             >= sizeof thisname - flist_dir_len) {
 754                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 755                 return NULL;
 756         }
 757         clean_fname(thisname, 0);
 758         if (sanitize_paths)
 759                 sanitize_path(thisname, thisname, "", 0);
 760
 761         memset(sum, 0, SUM_LENGTH);
 762
 763         if (stp && S_ISDIR(stp->st_mode))
 764                 st = *stp; /* Needed for "symlink/." with --relative. */
 765         else if (readlink_stat(thisname, &st, linkname) != 0) {
 766                 int save_errno = errno;
 767                 /* See if file is excluded before reporting an error. */
 768                 if (filter_level != NO_FILTERS
 769                     && is_excluded(thisname, 0, filter_level))
 770                         return NULL;
 771                 if (save_errno == ENOENT) {
 772 #ifdef SUPPORT_LINKS
 773                         /* Avoid "vanished" error if symlink points nowhere. */
 774                         if (copy_links && do_lstat(thisname, &st) == 0
 775                             && S_ISLNK(st.st_mode)) {
 776                                 io_error |= IOERR_GENERAL;
 777                                 rprintf(FERROR, "symlink has no referent: %s\n",
 778                                         full_fname(thisname));
 779                         } else
 780 #endif
 781                         {
 782                                 enum logcode c = am_daemon && protocol_version < 28
 783                                     ? FERROR : FINFO;
 784                                 io_error |= IOERR_VANISHED;
 785                                 rprintf(c, "file has vanished: %s\n",
 786                                         full_fname(thisname));
 787                         }
 788                 } else {
 789                         io_error |= IOERR_GENERAL;
 790                         rsyserr(FERROR, save_errno, "readlink %s failed",
 791                                 full_fname(thisname));
 792                 }
 793                 return NULL;
 794         }
 795
 796         /* backup.c calls us with filter_level set to NO_FILTERS. */
 797         if (filter_level == NO_FILTERS)
 798                 goto skip_filters;
 799
 800         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 801                 rprintf(FINFO, "skipping directory %s\n", thisname);
 802                 return NULL;
 803         }
 804
 805         /* We only care about directories because we need to avoid recursing
 806          * into a mount-point directory, not to avoid copying a symlinked
 807          * file if -L (or similar) was specified. */
 808         if (one_file_system && st.st_dev != filesystem_dev
 809             && S_ISDIR(st.st_mode)) {
 810                 if (one_file_system > 1)
 811                         return NULL;
 812                 flags |= FLAG_MOUNT_POINT;
 813         }
 814
 815         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 816                 return NULL;
 817
 818         if (lp_ignore_nonreadable(module_id)) {
 819 #ifdef SUPPORT_LINKS
 820                 if (!S_ISLNK(st.st_mode))
 821 #endif
 822                         if (access(thisname, R_OK) != 0)
 823                                 return NULL;
 824         }
 825
 826   skip_filters:
 827
 828         if (verbose > 2) {
 829                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 830                         who_am_i(), thisname, filter_level);
 831         }
 832
 833         if ((basename = strrchr(thisname, '/')) != NULL) {
 834                 dirname_len = ++basename - thisname; /* counts future '\0' */
 835                 if (lastdir_len == dirname_len - 1
 836                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 837                         dirname = lastdir;
 838                         dirname_len = 0; /* indicates no copy is needed */
 839                 } else
 840                         dirname = thisname;
 841         } else {
 842                 basename = thisname;
 843                 dirname = NULL;
 844                 dirname_len = 0;
 845         }
 846         basename_len = strlen(basename) + 1; /* count the '\0' */
 847
 848 #ifdef SUPPORT_LINKS
 849         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 850 #else
 851         linkname_len = 0;
 852 #endif
 853
 854         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 855                 ? MD4_SUM_LENGTH : 0;
 856
 857         alloc_len = file_struct_len + dirname_len + basename_len
 858             + linkname_len + sum_len;
 859         if (flist)
 860                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 861         else {
 862                 if (!(bp = new_array(char, alloc_len)))
 863                         out_of_memory("make_file");
 864         }
 865
 866         file = (struct file_struct *)bp;
 867         memset(bp, 0, file_struct_len);
 868         bp += file_struct_len;
 869
 870         file->flags = flags;
 871         file->modtime = st.st_mtime;
 872         file->length = st.st_size;
 873         if (chmod_modes && am_sender && (S_ISREG(st.st_mode) || S_ISDIR(st.st_mode)))
 874                 file->mode = tweak_mode(st.st_mode, chmod_modes);
 875         else
 876                 file->mode = st.st_mode;
 877         file->uid = st.st_uid;
 878         file->gid = st.st_gid;
 879
 880 #ifdef SUPPORT_HARD_LINKS
 881         if (flist && flist->hlink_pool) {
 882                 if (protocol_version < 28) {
 883                         if (S_ISREG(st.st_mode))
 884                                 file->link_u.idev = pool_talloc(
 885                                     flist->hlink_pool, struct idev, 1,
 886                                     "inode_table");
 887                 } else {
 888                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 889                                 file->link_u.idev = pool_talloc(
 890                                     flist->hlink_pool, struct idev, 1,
 891                                     "inode_table");
 892                 }
 893         }
 894         if (file->link_u.idev) {
 895                 file->F_DEV = st.st_dev;
 896                 file->F_INODE = st.st_ino;
 897         }
 898 #endif
 899
 900         if (dirname_len) {
 901                 file->dirname = lastdir = bp;
 902                 lastdir_len = dirname_len - 1;
 903                 memcpy(bp, dirname, dirname_len - 1);
 904                 bp += dirname_len;
 905                 bp[-1] = '\0';
 906         } else if (dirname)
 907                 file->dirname = dirname;
 908
 909         file->basename = bp;
 910         memcpy(bp, basename, basename_len);
 911         bp += basename_len;
 912
 913 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 914         if (preserve_devices && IS_DEVICE(st.st_mode))
 915                 file->u.rdev = st.st_rdev;
 916 #endif
 917
 918 #ifdef SUPPORT_LINKS
 919         if (linkname_len) {
 920                 file->u.link = bp;
 921                 memcpy(bp, linkname, linkname_len);
 922                 bp += linkname_len;
 923         }
 924 #endif
 925
 926         if (sum_len) {
 927                 file->u.sum = bp;
 928                 file_checksum(thisname, bp, st.st_size);
 929                 /*bp += sum_len;*/
 930         }
 931
 932         file->dir.root = flist_dir;
 933
 934         /* This code is only used by the receiver when it is building
 935          * a list of files for a delete pass. */
 936         if (keep_dirlinks && linkname_len && flist) {
 937                 STRUCT_STAT st2;
 938                 int save_mode = file->mode;
 939                 file->mode = S_IFDIR; /* find a directory w/our name */
 940                 if (flist_find(the_file_list, file) >= 0
 941                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 942                         file->modtime = st2.st_mtime;
 943                         file->length = st2.st_size;
 944                         file->mode = st2.st_mode;
 945                         file->uid = st2.st_uid;
 946                         file->gid = st2.st_gid;
 947                         file->u.link = NULL;
 948                 } else
 949                         file->mode = save_mode;
 950         }
 951
 952         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 953                 stats.total_size += st.st_size;
 954
 955         return file;
 956 }
 957
 958 static struct file_struct *send_file_name(int f, struct file_list *flist,
 959                                           char *fname, STRUCT_STAT *stp,
 960                                           unsigned short flags)
 961 {
 962         struct file_struct *file;
 963
 964         file = make_file(fname, flist, stp, flags,
 965                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 966         if (!file)
 967                 return NULL;
 968
 969         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 970
 971         flist_expand(flist);
 972
 973         if (file->basename[0]) {
 974                 flist->files[flist->count++] = file;
 975                 send_file_entry(file, f);
 976         }
 977         return file;
 978 }
 979
 980 static void send_if_directory(int f, struct file_list *flist,
 981                               struct file_struct *file,
 982                               char *fbuf, unsigned int ol)
 983 {
 984         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 985
 986         if (S_ISDIR(file->mode)
 987             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 988                 void *save_filters;
 989                 unsigned int len = strlen(fbuf);
 990                 if (len > 1 && fbuf[len-1] == '/')
 991                         fbuf[--len] = '\0';
 992                 if (len >= MAXPATHLEN - 1) {
 993                         io_error |= IOERR_GENERAL;
 994                         rprintf(FERROR, "skipping long-named directory: %s\n",
 995                                 full_fname(fbuf));
 996                         return;
 997                 }
 998                 save_filters = push_local_filters(fbuf, len);
 999                 send_directory(f, flist, fbuf, len);
1000                 pop_local_filters(save_filters);
1001                 fbuf[ol] = '\0';
1002                 if (is_dot_dir)
1003                         fbuf[ol-1] = '.';
1004         }
1005 }
1006
1007 /* This function is normally called by the sender, but the receiving side also
1008  * calls it from get_dirlist() with f set to -1 so that we just construct the
1009  * file list in memory without sending it over the wire.  Also, get_dirlist()
1010  * might call this with f set to -2, which also indicates that local filter
1011  * rules should be ignored. */
1012 static void send_directory(int f, struct file_list *flist,
1013                            char *fbuf, int len)
1014 {
1015         struct dirent *di;
1016         unsigned remainder;
1017         char *p;
1018         DIR *d;
1019         int start = flist->count;
1020
1021         if (!(d = opendir(fbuf))) {
1022                 io_error |= IOERR_GENERAL;
1023                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1024                 return;
1025         }
1026
1027         p = fbuf + len;
1028         if (len != 1 || *fbuf != '/')
1029                 *p++ = '/';
1030         *p = '\0';
1031         remainder = MAXPATHLEN - (p - fbuf);
1032
1033         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1034                 char *dname = d_name(di);
1035                 if (dname[0] == '.' && (dname[1] == '\0'
1036                     || (dname[1] == '.' && dname[2] == '\0')))
1037                         continue;
1038                 if (strlcpy(p, dname, remainder) >= remainder) {
1039                         io_error |= IOERR_GENERAL;
1040                         rprintf(FINFO,
1041                                 "cannot send long-named file %s\n",
1042                                 full_fname(fbuf));
1043                         continue;
1044                 }
1045
1046                 send_file_name(f, flist, fbuf, NULL, 0);
1047         }
1048
1049         fbuf[len] = '\0';
1050
1051         if (errno) {
1052                 io_error |= IOERR_GENERAL;
1053                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1054         }
1055
1056         closedir(d);
1057
1058         if (recurse) {
1059                 int i, end = flist->count - 1;
1060                 for (i = start; i <= end; i++)
1061                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1062         }
1063 }
1064
1065 struct file_list *send_file_list(int f, int argc, char *argv[])
1066 {
1067         int len;
1068         STRUCT_STAT st;
1069         char *p, *dir, olddir[sizeof curr_dir];
1070         char lastpath[MAXPATHLEN] = "";
1071         struct file_list *flist;
1072         struct timeval start_tv, end_tv;
1073         int64 start_write;
1074         int use_ff_fd = 0;
1075
1076         if (show_filelist_p())
1077                 start_filelist_progress("building file list");
1078
1079         start_write = stats.total_written;
1080         gettimeofday(&start_tv, NULL);
1081
1082         flist = flist_new(WITH_HLINK, "send_file_list");
1083
1084         io_start_buffering_out();
1085         if (filesfrom_fd >= 0) {
1086                 if (argv[0] && !push_dir(argv[0])) {
1087                         rsyserr(FERROR, errno, "push_dir %s failed",
1088                                 full_fname(argv[0]));
1089                         exit_cleanup(RERR_FILESELECT);
1090                 }
1091                 use_ff_fd = 1;
1092         }
1093
1094         while (1) {
1095                 char fbuf[MAXPATHLEN];
1096                 char *fn;
1097                 int is_dot_dir;
1098
1099                 if (use_ff_fd) {
1100                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1101                                 break;
1102                         sanitize_path(fbuf, fbuf, "", 0);
1103                 } else {
1104                         if (argc-- == 0)
1105                                 break;
1106                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1107                         if (sanitize_paths)
1108                                 sanitize_path(fbuf, fbuf, "", 0);
1109                 }
1110
1111                 len = strlen(fbuf);
1112                 if (relative_paths) {
1113                         /* We clean up fbuf below. */
1114                         is_dot_dir = 0;
1115                 } else if (!len || fbuf[len - 1] == '/') {
1116                         if (len == 2 && fbuf[0] == '.') {
1117                                 /* Turn "./" into just "." rather than "./." */
1118                                 fbuf[1] = '\0';
1119                         } else {
1120                                 if (len + 1 >= MAXPATHLEN)
1121                                         overflow_exit("send_file_list");
1122                                 fbuf[len++] = '.';
1123                                 fbuf[len] = '\0';
1124                         }
1125                         is_dot_dir = 1;
1126                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1127                     && (len == 2 || fbuf[len-3] == '/')) {
1128                         if (len + 2 >= MAXPATHLEN)
1129                                 overflow_exit("send_file_list");
1130                         fbuf[len++] = '/';
1131                         fbuf[len++] = '.';
1132                         fbuf[len] = '\0';
1133                         is_dot_dir = 1;
1134                 } else {
1135                         is_dot_dir = fbuf[len-1] == '.'
1136                                    && (len == 1 || fbuf[len-2] == '/');
1137                 }
1138
1139                 if (link_stat(fbuf, &st, keep_dirlinks) != 0) {
1140                         io_error |= IOERR_GENERAL;
1141                         rsyserr(FERROR, errno, "link_stat %s failed",
1142                                 full_fname(fbuf));
1143                         continue;
1144                 }
1145
1146                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1147                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1148                         continue;
1149                 }
1150
1151                 dir = NULL;
1152                 olddir[0] = '\0';
1153
1154                 if (!relative_paths) {
1155                         p = strrchr(fbuf, '/');
1156                         if (p) {
1157                                 *p = '\0';
1158                                 if (p == fbuf)
1159                                         dir = "/";
1160                                 else
1161                                         dir = fbuf;
1162                                 len -= p - fbuf + 1;
1163                                 fn = p + 1;
1164                         } else
1165                                 fn = fbuf;
1166                 } else {
1167                         if ((p = strstr(fbuf, "/./")) != NULL) {
1168                                 *p = '\0';
1169                                 if (p == fbuf)
1170                                         dir = "/";
1171                                 else
1172                                         dir = fbuf;
1173                                 len -= p - fbuf + 3;
1174                                 fn = p + 3;
1175                         } else
1176                                 fn = fbuf;
1177                         /* Get rid of trailing "/" and "/.". */
1178                         while (len) {
1179                                 if (fn[len - 1] == '/') {
1180                                         is_dot_dir = 1;
1181                                         if (!--len && !dir) {
1182                                                 len++;
1183                                                 break;
1184                                         }
1185                                 }
1186                                 else if (len >= 2 && fn[len - 1] == '.'
1187                                                   && fn[len - 2] == '/') {
1188                                         is_dot_dir = 1;
1189                                         if (!(len -= 2) && !dir) {
1190                                                 len++;
1191                                                 break;
1192                                         }
1193                                 } else
1194                                         break;
1195                         }
1196                         fn[len] = '\0';
1197                         /* Reject a ".." dir in the active part of the path. */
1198                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1199                                 if ((p[2] == '/' || p[2] == '\0')
1200                                  && (p == fn || p[-1] == '/')) {
1201                                         rprintf(FERROR,
1202                                             "found \"..\" dir in relative path: %s\n",
1203                                             fbuf);
1204                                         exit_cleanup(RERR_SYNTAX);
1205                                 }
1206                         }
1207                 }
1208
1209                 if (!*fn) {
1210                         len = 1;
1211                         fn = ".";
1212                 }
1213
1214                 if (dir && *dir) {
1215                         static char *lastdir;
1216                         static int lastdir_len;
1217
1218                         strlcpy(olddir, curr_dir, sizeof olddir);
1219
1220                         if (!push_dir(dir)) {
1221                                 io_error |= IOERR_GENERAL;
1222                                 rsyserr(FERROR, errno, "push_dir %s failed",
1223                                         full_fname(dir));
1224                                 continue;
1225                         }
1226
1227                         if (lastdir && strcmp(lastdir, dir) == 0) {
1228                                 flist_dir = lastdir;
1229                                 flist_dir_len = lastdir_len;
1230                         } else {
1231                                 flist_dir = lastdir = strdup(dir);
1232                                 flist_dir_len = lastdir_len = strlen(dir);
1233                         }
1234                 }
1235
1236                 if (fn != fbuf)
1237                         memmove(fbuf, fn, len + 1);
1238
1239                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1240                         /* Send the implied directories at the start of the
1241                          * source spec, so we get their permissions right. */
1242                         char *lp = lastpath, *slash = fbuf;
1243                         *p = '\0';
1244                         /* Skip any initial directories in our path that we
1245                          * have in common with lastpath. */
1246                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1247                                 if (*fn == '/')
1248                                         slash = fn;
1249                         }
1250                         *p = '/';
1251                         if (fn != p || (*lp && *lp != '/')) {
1252                                 int save_copy_links = copy_links;
1253                                 int save_xfer_dirs = xfer_dirs;
1254                                 copy_links = copy_unsafe_links;
1255                                 xfer_dirs = 1;
1256                                 while ((slash = strchr(slash+1, '/')) != 0) {
1257                                         *slash = '\0';
1258                                         send_file_name(f, flist, fbuf, NULL, 0);
1259                                         *slash = '/';
1260                                 }
1261                                 copy_links = save_copy_links;
1262                                 xfer_dirs = save_xfer_dirs;
1263                                 *p = '\0';
1264                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1265                                 *p = '/';
1266                         }
1267                 }
1268
1269                 if (one_file_system)
1270                         filesystem_dev = st.st_dev;
1271
1272                 if (recurse || (xfer_dirs && is_dot_dir)) {
1273                         struct file_struct *file;
1274                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1275                         if (file)
1276                                 send_if_directory(f, flist, file, fbuf, len);
1277                 } else
1278                         send_file_name(f, flist, fbuf, &st, 0);
1279
1280                 if (olddir[0]) {
1281                         flist_dir = NULL;
1282                         flist_dir_len = 0;
1283                         if (!pop_dir(olddir)) {
1284                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1285                                         full_fname(olddir));
1286                                 exit_cleanup(RERR_FILESELECT);
1287                         }
1288                 }
1289         }
1290
1291         gettimeofday(&end_tv, NULL);
1292         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1293                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1294         if (stats.flist_buildtime == 0)
1295                 stats.flist_buildtime = 1;
1296         start_tv = end_tv;
1297
1298         send_file_entry(NULL, f);
1299
1300         if (show_filelist_p())
1301                 finish_filelist_progress(flist);
1302
1303         gettimeofday(&end_tv, NULL);
1304         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1305                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1306
1307         if (flist->hlink_pool) {
1308                 pool_destroy(flist->hlink_pool);
1309                 flist->hlink_pool = NULL;
1310         }
1311
1312         /* Sort the list without removing any duplicates.  This allows the
1313          * receiving side to ask for any name they like, which gives us the
1314          * flexibility to change the way we unduplicate names in the future
1315          * without causing a compatibility problem with older versions. */
1316         clean_flist(flist, 0, 0);
1317
1318         /* Now send the uid/gid list. This was introduced in
1319          * protocol version 15 */
1320         send_uid_list(f);
1321
1322         /* send the io_error flag */
1323         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1324
1325         io_end_buffering();
1326         stats.flist_size = stats.total_written - start_write;
1327         stats.num_files = flist->count;
1328
1329         if (verbose > 3)
1330                 output_flist(flist);
1331
1332         if (verbose > 2)
1333                 rprintf(FINFO, "send_file_list done\n");
1334
1335         return flist;
1336 }
1337
1338 struct file_list *recv_file_list(int f)
1339 {
1340         struct file_list *flist;
1341         unsigned short flags;
1342         int64 start_read;
1343
1344         if (show_filelist_p())
1345                 start_filelist_progress("receiving file list");
1346
1347         start_read = stats.total_read;
1348
1349         flist = flist_new(WITH_HLINK, "recv_file_list");
1350
1351         flist->count = 0;
1352         flist->malloced = 1000;
1353         flist->files = new_array(struct file_struct *, flist->malloced);
1354         if (!flist->files)
1355                 goto oom;
1356
1357         while ((flags = read_byte(f)) != 0) {
1358                 struct file_struct *file;
1359
1360                 flist_expand(flist);
1361
1362                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1363                         flags |= read_byte(f) << 8;
1364                 file = receive_file_entry(flist, flags, f);
1365
1366                 if (S_ISREG(file->mode))
1367                         stats.total_size += file->length;
1368
1369                 flist->files[flist->count++] = file;
1370
1371                 maybe_emit_filelist_progress(flist->count);
1372
1373                 if (verbose > 2) {
1374                         rprintf(FINFO, "recv_file_name(%s)\n",
1375                                 f_name(file, NULL));
1376                 }
1377         }
1378         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1379
1380         if (verbose > 2)
1381                 rprintf(FINFO, "received %d names\n", flist->count);
1382
1383         if (show_filelist_p())
1384                 finish_filelist_progress(flist);
1385
1386         clean_flist(flist, relative_paths, 1);
1387
1388         if (f >= 0) {
1389                 /* Now send the uid/gid list. This was introduced in
1390                  * protocol version 15 */
1391                 recv_uid_list(f, flist);
1392
1393                 /* Recv the io_error flag */
1394                 if (lp_ignore_errors(module_id) || ignore_errors)
1395                         read_int(f);
1396                 else
1397                         io_error |= read_int(f);
1398         }
1399
1400         if (verbose > 3)
1401                 output_flist(flist);
1402
1403         if (list_only) {
1404                 int i;
1405                 for (i = 0; i < flist->count; i++)
1406                         list_file_entry(flist->files[i]);
1407         }
1408
1409         if (verbose > 2)
1410                 rprintf(FINFO, "recv_file_list done\n");
1411
1412         stats.flist_size = stats.total_read - start_read;
1413         stats.num_files = flist->count;
1414
1415         return flist;
1416
1417   oom:
1418         out_of_memory("recv_file_list");
1419         return NULL;            /* not reached */
1420 }
1421
1422 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1423 {
1424         return f_name_cmp(*file1, *file2);
1425 }
1426
1427 /* Search for an identically-named item in the file list.  Note that the
1428  * items must agree in their directory-ness, or no match is returned. */
1429 int flist_find(struct file_list *flist, struct file_struct *f)
1430 {
1431         int low = flist->low, high = flist->high;
1432         int ret, mid, mid_up;
1433
1434         while (low <= high) {
1435                 mid = (low + high) / 2;
1436                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1437                 if (mid_up <= high)
1438                         ret = f_name_cmp(flist->files[mid_up], f);
1439                 else
1440                         ret = 1;
1441                 if (ret == 0) {
1442                         if (protocol_version < 29
1443                             && S_ISDIR(flist->files[mid_up]->mode)
1444                             != S_ISDIR(f->mode))
1445                                 return -1;
1446                         return mid_up;
1447                 }
1448                 if (ret > 0)
1449                         high = mid - 1;
1450                 else
1451                         low = mid_up + 1;
1452         }
1453         return -1;
1454 }
1455
1456 /*
1457  * Free up any resources a file_struct has allocated
1458  * and clear the file.
1459  */
1460 void clear_file(int i, struct file_list *flist)
1461 {
1462         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1463                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1464         memset(flist->files[i], 0, file_struct_len);
1465 }
1466
1467 /*
1468  * allocate a new file list
1469  */
1470 struct file_list *flist_new(int with_hlink, char *msg)
1471 {
1472         struct file_list *flist;
1473
1474         flist = new(struct file_list);
1475         if (!flist)
1476                 out_of_memory(msg);
1477
1478         memset(flist, 0, sizeof (struct file_list));
1479
1480         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1481             out_of_memory, POOL_INTERN)))
1482                 out_of_memory(msg);
1483
1484 #ifdef SUPPORT_HARD_LINKS
1485         if (with_hlink && preserve_hard_links) {
1486                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1487                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1488                         out_of_memory(msg);
1489         }
1490 #endif
1491
1492         return flist;
1493 }
1494
1495 /*
1496  * free up all elements in a flist
1497  */
1498 void flist_free(struct file_list *flist)
1499 {
1500         pool_destroy(flist->file_pool);
1501         pool_destroy(flist->hlink_pool);
1502         free(flist->files);
1503         free(flist);
1504 }
1505
1506 /*
1507  * This routine ensures we don't have any duplicate names in our file list.
1508  * duplicate names can cause corruption because of the pipelining
1509  */
1510 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1511 {
1512         int i, prev_i = 0;
1513
1514         if (!flist)
1515                 return;
1516         if (flist->count == 0) {
1517                 flist->high = -1;
1518                 return;
1519         }
1520
1521         qsort(flist->files, flist->count,
1522             sizeof flist->files[0], (int (*)())file_compare);
1523
1524         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1525                 if (flist->files[i]->basename) {
1526                         prev_i = i;
1527                         break;
1528                 }
1529         }
1530         flist->low = prev_i;
1531         while (++i < flist->count) {
1532                 int j;
1533                 struct file_struct *file = flist->files[i];
1534
1535                 if (!file->basename)
1536                         continue;
1537                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1538                         j = prev_i;
1539                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1540                         int save_mode = file->mode;
1541                         /* Make sure that this directory doesn't duplicate a
1542                          * non-directory earlier in the list. */
1543                         flist->high = prev_i;
1544                         file->mode = S_IFREG;
1545                         j = flist_find(flist, file);
1546                         file->mode = save_mode;
1547                 } else
1548                         j = -1;
1549                 if (j >= 0) {
1550                         struct file_struct *fp = flist->files[j];
1551                         int keep, drop;
1552                         /* If one is a dir and the other is not, we want to
1553                          * keep the dir because it might have contents in the
1554                          * list. */
1555                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1556                                 if (S_ISDIR(file->mode))
1557                                         keep = i, drop = j;
1558                                 else
1559                                         keep = j, drop = i;
1560                         } else
1561                                 keep = j, drop = i;
1562                         if (verbose > 1 && !am_server) {
1563                                 rprintf(FINFO,
1564                                         "removing duplicate name %s from file list (%d)\n",
1565                                         f_name(file, NULL), drop);
1566                         }
1567                         /* Make sure that if we unduplicate '.', that we don't
1568                          * lose track of a user-specified top directory. */
1569                         flist->files[keep]->flags |= flist->files[drop]->flags
1570                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1571
1572                         clear_file(drop, flist);
1573
1574                         if (keep == i) {
1575                                 if (flist->low == drop) {
1576                                         for (j = drop + 1;
1577                                              j < i && !flist->files[j]->basename;
1578                                              j++) {}
1579                                         flist->low = j;
1580                                 }
1581                                 prev_i = i;
1582                         }
1583                 } else
1584                         prev_i = i;
1585         }
1586         flist->high = no_dups ? prev_i : flist->count - 1;
1587
1588         if (strip_root) {
1589                 /* We need to strip off the leading slashes for relative
1590                  * paths, but this must be done _after_ the sorting phase. */
1591                 for (i = flist->low; i <= flist->high; i++) {
1592                         struct file_struct *file = flist->files[i];
1593
1594                         if (!file->dirname)
1595                                 continue;
1596                         if (*file->dirname == '/') {
1597                                 char *s = file->dirname + 1;
1598                                 while (*s == '/') s++;
1599                                 memmove(file->dirname, s, strlen(s) + 1);
1600                         }
1601
1602                         if (!*file->dirname)
1603                                 file->dirname = NULL;
1604                 }
1605         }
1606 }
1607
1608 static void output_flist(struct file_list *flist)
1609 {
1610         char uidbuf[16], gidbuf[16], depthbuf[16];
1611         struct file_struct *file;
1612         const char *who = who_am_i();
1613         int i;
1614
1615         for (i = 0; i < flist->count; i++) {
1616                 file = flist->files[i];
1617                 if ((am_root || am_sender) && preserve_uid)
1618                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1619                 else
1620                         *uidbuf = '\0';
1621                 if (preserve_gid && file->gid != GID_NONE)
1622                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1623                 else
1624                         *gidbuf = '\0';
1625                 if (!am_sender)
1626                         sprintf(depthbuf, "%d", file->dir.depth);
1627                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1628                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1629                         file->dirname ? file->dirname : "",
1630                         file->dirname ? "/" : "", NS(file->basename),
1631                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1632                         (double)file->length, uidbuf, gidbuf, file->flags);
1633         }
1634 }
1635
1636 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1637 enum fnc_type { t_PATH, t_ITEM };
1638
1639 /* Compare the names of two file_struct entities, similar to how strcmp()
1640  * would do if it were operating on the joined strings.
1641  *
1642  * Some differences beginning with protocol_version 29: (1) directory names
1643  * are compared with an assumed trailing slash so that they compare in a
1644  * way that would cause them to sort immediately prior to any content they
1645  * may have; (2) a directory of any name compares after a non-directory of
1646  * any name at the same depth; (3) a directory with name "." compares prior
1647  * to anything else.  These changes mean that a directory and a non-dir
1648  * with the same name will not compare as equal (protocol_version >= 29).
1649  *
1650  * The dirname component can be an empty string, but the basename component
1651  * cannot (and never is in the current codebase).  The basename component
1652  * may be NULL (for a removed item), in which case it is considered to be
1653  * after any existing item. */
1654 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1655 {
1656         int dif;
1657         const uchar *c1, *c2;
1658         enum fnc_state state1, state2;
1659         enum fnc_type type1, type2;
1660         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1661
1662         if (!f1 || !f1->basename) {
1663                 if (!f2 || !f2->basename)
1664                         return 0;
1665                 return -1;
1666         }
1667         if (!f2 || !f2->basename)
1668                 return 1;
1669
1670         c1 = (uchar*)f1->dirname;
1671         c2 = (uchar*)f2->dirname;
1672         if (c1 == c2)
1673                 c1 = c2 = NULL;
1674         if (!c1) {
1675                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1676                 c1 = (uchar*)f1->basename;
1677                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1678                         type1 = t_ITEM;
1679                         state1 = s_TRAILING;
1680                         c1 = (uchar*)"";
1681                 } else
1682                         state1 = s_BASE;
1683         } else if (!*c1) {
1684                 type1 = t_path;
1685                 state1 = s_SLASH;
1686                 c1 = (uchar*)"/";
1687         } else {
1688                 type1 = t_path;
1689                 state1 = s_DIR;
1690         }
1691         if (!c2) {
1692                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1693                 c2 = (uchar*)f2->basename;
1694                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1695                         type2 = t_ITEM;
1696                         state2 = s_TRAILING;
1697                         c2 = (uchar*)"";
1698                 } else
1699                         state2 = s_BASE;
1700         } else if (!*c2) {
1701                 type2 = t_path;
1702                 state2 = s_SLASH;
1703                 c2 = (uchar*)"/";
1704         } else {
1705                 type2 = t_path;
1706                 state2 = s_DIR;
1707         }
1708
1709         if (type1 != type2)
1710                 return type1 == t_PATH ? 1 : -1;
1711
1712         while (1) {
1713                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1714                         break;
1715                 if (!*c1) {
1716                         switch (state1) {
1717                         case s_DIR:
1718                                 state1 = s_SLASH;
1719                                 c1 = (uchar*)"/";
1720                                 break;
1721                         case s_SLASH:
1722                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1723                                 c1 = (uchar*)f1->basename;
1724                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1725                                         type1 = t_ITEM;
1726                                         state1 = s_TRAILING;
1727                                         c1 = (uchar*)"";
1728                                 } else
1729                                         state1 = s_BASE;
1730                                 break;
1731                         case s_BASE:
1732                                 state1 = s_TRAILING;
1733                                 if (type1 == t_PATH) {
1734                                         c1 = (uchar*)"/";
1735                                         break;
1736                                 }
1737                                 /* FALL THROUGH */
1738                         case s_TRAILING:
1739                                 type1 = t_ITEM;
1740                                 break;
1741                         }
1742                         if (*c2 && type1 != type2)
1743                                 return type1 == t_PATH ? 1 : -1;
1744                 }
1745                 if (!*c2) {
1746                         switch (state2) {
1747                         case s_DIR:
1748                                 state2 = s_SLASH;
1749                                 c2 = (uchar*)"/";
1750                                 break;
1751                         case s_SLASH:
1752                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1753                                 c2 = (uchar*)f2->basename;
1754                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1755                                         type2 = t_ITEM;
1756                                         state2 = s_TRAILING;
1757                                         c2 = (uchar*)"";
1758                                 } else
1759                                         state2 = s_BASE;
1760                                 break;
1761                         case s_BASE:
1762                                 state2 = s_TRAILING;
1763                                 if (type2 == t_PATH) {
1764                                         c2 = (uchar*)"/";
1765                                         break;
1766                                 }
1767                                 /* FALL THROUGH */
1768                         case s_TRAILING:
1769                                 if (!*c1)
1770                                         return 0;
1771                                 type2 = t_ITEM;
1772                                 break;
1773                         }
1774                         if (type1 != type2)
1775                                 return type1 == t_PATH ? 1 : -1;
1776                 }
1777         }
1778
1779         return dif;
1780 }
1781
1782 /* Return a copy of the full filename of a flist entry, using the indicated
1783  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1784  * done because we checked the size when creating the file_struct entry.
1785  */
1786 char *f_name(struct file_struct *f, char *fbuf)
1787 {
1788         if (!f || !f->basename)
1789                 return NULL;
1790
1791         if (!fbuf) {
1792                 static char names[5][MAXPATHLEN];
1793                 static unsigned int n;
1794
1795                 n = (n + 1) % (sizeof names / sizeof names[0]);
1796
1797                 fbuf = names[n];
1798         }
1799
1800         if (f->dirname) {
1801                 int len = strlen(f->dirname);
1802                 memcpy(fbuf, f->dirname, len);
1803                 fbuf[len] = '/';
1804                 strcpy(fbuf + len + 1, f->basename);
1805         } else
1806                 strcpy(fbuf, f->basename);
1807
1808         return fbuf;
1809 }
1810
1811 /* Do a non-recursive scan of the named directory, possibly ignoring all
1812  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1813  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1814  * buffer (the functions we call will append names onto the end, but the old
1815  * dir value will be restored on exit). */
1816 struct file_list *get_dirlist(char *dirname, int dlen,
1817                               int ignore_filter_rules)
1818 {
1819         struct file_list *dirlist;
1820         char dirbuf[MAXPATHLEN];
1821         int save_recurse = recurse;
1822
1823         if (dlen < 0) {
1824                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1825                 if (dlen >= MAXPATHLEN)
1826                         return NULL;
1827                 dirname = dirbuf;
1828         }
1829
1830         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1831
1832         recurse = 0;
1833         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1834         recurse = save_recurse;
1835         if (do_progress)
1836                 flist_count_offset += dirlist->count;
1837
1838         clean_flist(dirlist, 0, 0);
1839
1840         if (verbose > 3)
1841                 output_flist(dirlist);
1842
1843         return dirlist;
1844 }