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 unsigned int file_struct_len;
  74
  75 static char empty_sum[MD4_SUM_LENGTH];
  76 static int flist_count_offset;
  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->ids->uid == uid)
 366                 flags |= XMIT_SAME_UID;
 367         else
 368                 uid = file->ids->uid;
 369         if (file->ids->gid == gid)
 370                 flags |= XMIT_SAME_GID;
 371         else
 372                 gid = file->ids->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 (chmod_modes && !S_ISLNK(mode))
 573                 mode = tweak_mode(mode, chmod_modes);
 574
 575         if (preserve_uid && !(flags & XMIT_SAME_UID))
 576                 uid = (uid_t)read_int(f);
 577         if (preserve_gid && !(flags & XMIT_SAME_GID))
 578                 gid = (gid_t)read_int(f);
 579
 580         if (preserve_devices) {
 581                 if (protocol_version < 28) {
 582                         if (IS_DEVICE(mode)) {
 583                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 584                                         rdev = (dev_t)read_int(f);
 585                         } else
 586                                 rdev = makedev(0, 0);
 587                 } else if (IS_DEVICE(mode)) {
 588                         uint32 rdev_minor;
 589                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 590                                 rdev_major = read_int(f);
 591                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 592                                 rdev_minor = read_byte(f);
 593                         else
 594                                 rdev_minor = read_int(f);
 595                         rdev = makedev(rdev_major, rdev_minor);
 596                 }
 597         }
 598
 599 #ifdef SUPPORT_LINKS
 600         if (preserve_links && S_ISLNK(mode)) {
 601                 linkname_len = read_int(f) + 1; /* count the '\0' */
 602                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 603                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 604                                 linkname_len - 1);
 605                         overflow_exit("receive_file_entry");
 606                 }
 607         }
 608         else
 609 #endif
 610                 linkname_len = 0;
 611
 612         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 613
 614         alloc_len = file_struct_len + dirname_len + basename_len
 615                   + linkname_len + sum_len;
 616         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 617
 618         file = (struct file_struct *)bp;
 619         memset(bp, 0, file_struct_len);
 620         bp += file_struct_len;
 621
 622         file->modtime = modtime;
 623         file->length = file_length;
 624         file->mode = mode;
 625         file->ids = id_pair(uid, gid);
 626
 627         if (dirname_len) {
 628                 file->dirname = lastdir = bp;
 629                 lastdir_len = dirname_len - 1;
 630                 memcpy(bp, dirname, dirname_len - 1);
 631                 bp += dirname_len;
 632                 bp[-1] = '\0';
 633                 lastdir_depth = count_dir_elements(lastdir);
 634                 file->dir.depth = lastdir_depth + 1;
 635         } else if (dirname) {
 636                 file->dirname = dirname; /* we're reusing lastname */
 637                 file->dir.depth = lastdir_depth + 1;
 638         } else
 639                 file->dir.depth = 1;
 640
 641         if (S_ISDIR(mode)) {
 642                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 643                         file->dir.depth--;
 644                 if (flags & XMIT_TOP_DIR) {
 645                         in_del_hier = recurse;
 646                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 647                         if (relative_paths && del_hier_name_len > 2
 648                             && lastname[del_hier_name_len-1] == '.'
 649                             && lastname[del_hier_name_len-2] == '/')
 650                                 del_hier_name_len -= 2;
 651                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 652                 } else if (in_del_hier) {
 653                         if (!relative_paths || !del_hier_name_len
 654                          || (l1 >= del_hier_name_len
 655                           && lastname[del_hier_name_len] == '/'))
 656                                 file->flags |= FLAG_DEL_HERE;
 657                         else
 658                                 in_del_hier = 0;
 659                 }
 660         }
 661
 662         file->basename = bp;
 663         memcpy(bp, basename, basename_len);
 664         bp += basename_len;
 665
 666         if (preserve_devices && IS_DEVICE(mode))
 667                 file->u.rdev = rdev;
 668
 669 #ifdef SUPPORT_LINKS
 670         if (linkname_len) {
 671                 file->u.link = bp;
 672                 read_sbuf(f, bp, linkname_len - 1);
 673                 if (sanitize_paths)
 674                         sanitize_path(bp, bp, "", lastdir_depth);
 675                 bp += linkname_len;
 676         }
 677 #endif
 678
 679 #ifdef SUPPORT_HARD_LINKS
 680         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 681                 flags |= XMIT_HAS_IDEV_DATA;
 682         if (flags & XMIT_HAS_IDEV_DATA) {
 683                 int64 inode;
 684                 if (protocol_version < 26) {
 685                         dev = read_int(f);
 686                         inode = read_int(f);
 687                 } else {
 688                         if (!(flags & XMIT_SAME_DEV))
 689                                 dev = read_longint(f);
 690                         inode = read_longint(f);
 691                 }
 692                 if (flist->hlink_pool) {
 693                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 694                             struct idev, 1, "inode_table");
 695                         file->F_INODE = inode;
 696                         file->F_DEV = dev;
 697                 }
 698         }
 699 #endif
 700
 701         if (always_checksum && (sum_len || protocol_version < 28)) {
 702                 char *sum;
 703                 if (sum_len) {
 704                         file->u.sum = sum = bp;
 705                         /*bp += sum_len;*/
 706                 } else {
 707                         /* Prior to 28, we get a useless set of nulls. */
 708                         sum = empty_sum;
 709                 }
 710                 read_buf(f, sum, checksum_len);
 711         }
 712
 713         if (!preserve_perms) {
 714                 /* set an appropriate set of permissions based on original
 715                  * permissions and umask. This emulates what GNU cp does */
 716                 file->mode &= ~orig_umask;
 717         }
 718
 719         return file;
 720 }
 721
 722 /**
 723  * Create a file_struct for a named file by reading its stat()
 724  * information and performing extensive checks against global
 725  * options.
 726  *
 727  * @return the new file, or NULL if there was an error or this file
 728  * should be excluded.
 729  *
 730  * @todo There is a small optimization opportunity here to avoid
 731  * stat()ing the file in some circumstances, which has a certain cost.
 732  * We are called immediately after doing readdir(), and so we may
 733  * already know the d_type of the file.  We could for example avoid
 734  * statting directories if we're not recursing, but this is not a very
 735  * important case.  Some systems may not have d_type.
 736  **/
 737 struct file_struct *make_file(char *fname, struct file_list *flist,
 738                               STRUCT_STAT *stp, unsigned short flags,
 739                               int filter_level)
 740 {
 741         static char *lastdir;
 742         static int lastdir_len = -1;
 743         struct file_struct *file;
 744         STRUCT_STAT st;
 745         char sum[SUM_LENGTH];
 746         char thisname[MAXPATHLEN];
 747         char linkname[MAXPATHLEN];
 748         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 749         char *basename, *dirname, *bp;
 750
 751         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 752                 lastdir_len = -1;
 753
 754         if (strlcpy(thisname, fname, sizeof thisname)
 755             >= sizeof thisname - flist_dir_len) {
 756                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 757                 return NULL;
 758         }
 759         clean_fname(thisname, 0);
 760         if (sanitize_paths)
 761                 sanitize_path(thisname, thisname, "", 0);
 762
 763         memset(sum, 0, SUM_LENGTH);
 764
 765         if (stp && S_ISDIR(stp->st_mode))
 766                 st = *stp; /* Needed for "symlink/." with --relative. */
 767         else if (readlink_stat(thisname, &st, linkname) != 0) {
 768                 int save_errno = errno;
 769                 /* See if file is excluded before reporting an error. */
 770                 if (filter_level != NO_FILTERS
 771                     && is_excluded(thisname, 0, filter_level))
 772                         return NULL;
 773                 if (save_errno == ENOENT) {
 774 #ifdef SUPPORT_LINKS
 775                         /* Avoid "vanished" error if symlink points nowhere. */
 776                         if (copy_links && do_lstat(thisname, &st) == 0
 777                             && S_ISLNK(st.st_mode)) {
 778                                 io_error |= IOERR_GENERAL;
 779                                 rprintf(FERROR, "symlink has no referent: %s\n",
 780                                         full_fname(thisname));
 781                         } else
 782 #endif
 783                         {
 784                                 enum logcode c = am_daemon && protocol_version < 28
 785                                     ? FERROR : FINFO;
 786                                 io_error |= IOERR_VANISHED;
 787                                 rprintf(c, "file has vanished: %s\n",
 788                                         full_fname(thisname));
 789                         }
 790                 } else {
 791                         io_error |= IOERR_GENERAL;
 792                         rsyserr(FERROR, save_errno, "readlink %s failed",
 793                                 full_fname(thisname));
 794                 }
 795                 return NULL;
 796         }
 797
 798         /* backup.c calls us with filter_level set to NO_FILTERS. */
 799         if (filter_level == NO_FILTERS)
 800                 goto skip_filters;
 801
 802         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 803                 rprintf(FINFO, "skipping directory %s\n", thisname);
 804                 return NULL;
 805         }
 806
 807         /* We only care about directories because we need to avoid recursing
 808          * into a mount-point directory, not to avoid copying a symlinked
 809          * file if -L (or similar) was specified. */
 810         if (one_file_system && st.st_dev != filesystem_dev
 811          && S_ISDIR(st.st_mode)) {
 812                 if (one_file_system > 1) {
 813                         if (verbose > 2) {
 814                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 815                                         thisname);
 816                         }
 817                         return NULL;
 818                 }
 819                 flags |= FLAG_MOUNT_POINT;
 820         }
 821
 822         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 823                 return NULL;
 824
 825         if (lp_ignore_nonreadable(module_id)) {
 826 #ifdef SUPPORT_LINKS
 827                 if (!S_ISLNK(st.st_mode))
 828 #endif
 829                         if (access(thisname, R_OK) != 0)
 830                                 return NULL;
 831         }
 832
 833   skip_filters:
 834
 835         if (verbose > 2) {
 836                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 837                         who_am_i(), thisname, filter_level);
 838         }
 839
 840         if ((basename = strrchr(thisname, '/')) != NULL) {
 841                 dirname_len = ++basename - thisname; /* counts future '\0' */
 842                 if (lastdir_len == dirname_len - 1
 843                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 844                         dirname = lastdir;
 845                         dirname_len = 0; /* indicates no copy is needed */
 846                 } else
 847                         dirname = thisname;
 848         } else {
 849                 basename = thisname;
 850                 dirname = NULL;
 851                 dirname_len = 0;
 852         }
 853         basename_len = strlen(basename) + 1; /* count the '\0' */
 854
 855 #ifdef SUPPORT_LINKS
 856         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 857 #else
 858         linkname_len = 0;
 859 #endif
 860
 861         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 862                 ? MD4_SUM_LENGTH : 0;
 863
 864         alloc_len = file_struct_len + dirname_len + basename_len
 865             + linkname_len + sum_len;
 866         if (flist)
 867                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 868         else {
 869                 if (!(bp = new_array(char, alloc_len)))
 870                         out_of_memory("make_file");
 871         }
 872
 873         file = (struct file_struct *)bp;
 874         memset(bp, 0, file_struct_len);
 875         bp += file_struct_len;
 876
 877         file->flags = flags;
 878         file->modtime = st.st_mtime;
 879         file->length = st.st_size;
 880         file->mode = st.st_mode;
 881         file->ids = id_pair(st.st_uid, st.st_gid);
 882
 883 #ifdef SUPPORT_HARD_LINKS
 884         if (flist && flist->hlink_pool) {
 885                 if (protocol_version < 28) {
 886                         if (S_ISREG(st.st_mode))
 887                                 file->link_u.idev = pool_talloc(
 888                                     flist->hlink_pool, struct idev, 1,
 889                                     "inode_table");
 890                 } else {
 891                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 892                                 file->link_u.idev = pool_talloc(
 893                                     flist->hlink_pool, struct idev, 1,
 894                                     "inode_table");
 895                 }
 896         }
 897         if (file->link_u.idev) {
 898                 file->F_DEV = st.st_dev;
 899                 file->F_INODE = st.st_ino;
 900         }
 901 #endif
 902
 903         if (dirname_len) {
 904                 file->dirname = lastdir = bp;
 905                 lastdir_len = dirname_len - 1;
 906                 memcpy(bp, dirname, dirname_len - 1);
 907                 bp += dirname_len;
 908                 bp[-1] = '\0';
 909         } else if (dirname)
 910                 file->dirname = dirname;
 911
 912         file->basename = bp;
 913         memcpy(bp, basename, basename_len);
 914         bp += basename_len;
 915
 916 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 917         if (preserve_devices && IS_DEVICE(st.st_mode))
 918                 file->u.rdev = st.st_rdev;
 919 #endif
 920
 921 #ifdef SUPPORT_LINKS
 922         if (linkname_len) {
 923                 file->u.link = bp;
 924                 memcpy(bp, linkname, linkname_len);
 925                 bp += linkname_len;
 926         }
 927 #endif
 928
 929         if (sum_len) {
 930                 file->u.sum = bp;
 931                 file_checksum(thisname, bp, st.st_size);
 932                 /*bp += sum_len;*/
 933         }
 934
 935         file->dir.root = flist_dir;
 936
 937         /* This code is only used by the receiver when it is building
 938          * a list of files for a delete pass. */
 939         if (keep_dirlinks && linkname_len && flist) {
 940                 STRUCT_STAT st2;
 941                 int save_mode = file->mode;
 942                 file->mode = S_IFDIR; /* Find a directory with our name. */
 943                 if (flist_find(the_file_list, file) >= 0
 944                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 945                         file->modtime = st2.st_mtime;
 946                         file->length = st2.st_size;
 947                         file->mode = st2.st_mode;
 948                         file->ids = id_pair(st2.st_uid, st2.st_gid);
 949                         file->u.link = NULL;
 950                 } else
 951                         file->mode = save_mode;
 952         }
 953
 954         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 955                 stats.total_size += st.st_size;
 956
 957         return file;
 958 }
 959
 960 static struct file_struct *send_file_name(int f, struct file_list *flist,
 961                                           char *fname, STRUCT_STAT *stp,
 962                                           unsigned short flags)
 963 {
 964         struct file_struct *file;
 965
 966         file = make_file(fname, flist, stp, flags,
 967                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 968         if (!file)
 969                 return NULL;
 970
 971         if (chmod_modes && !S_ISLNK(file->mode))
 972                 file->mode = tweak_mode(file->mode, chmod_modes);
 973
 974         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 975
 976         flist_expand(flist);
 977
 978         if (file->basename[0]) {
 979                 flist->files[flist->count++] = file;
 980                 send_file_entry(file, f);
 981         }
 982         return file;
 983 }
 984
 985 static void send_if_directory(int f, struct file_list *flist,
 986                               struct file_struct *file,
 987                               char *fbuf, unsigned int ol)
 988 {
 989         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 990
 991         if (S_ISDIR(file->mode)
 992             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 993                 void *save_filters;
 994                 unsigned int len = strlen(fbuf);
 995                 if (len > 1 && fbuf[len-1] == '/')
 996                         fbuf[--len] = '\0';
 997                 if (len >= MAXPATHLEN - 1) {
 998                         io_error |= IOERR_GENERAL;
 999                         rprintf(FERROR, "skipping long-named directory: %s\n",
1000                                 full_fname(fbuf));
1001                         return;
1002                 }
1003                 save_filters = push_local_filters(fbuf, len);
1004                 send_directory(f, flist, fbuf, len);
1005                 pop_local_filters(save_filters);
1006                 fbuf[ol] = '\0';
1007                 if (is_dot_dir)
1008                         fbuf[ol-1] = '.';
1009         }
1010 }
1011
1012 /* This function is normally called by the sender, but the receiving side also
1013  * calls it from get_dirlist() with f set to -1 so that we just construct the
1014  * file list in memory without sending it over the wire.  Also, get_dirlist()
1015  * might call this with f set to -2, which also indicates that local filter
1016  * rules should be ignored. */
1017 static void send_directory(int f, struct file_list *flist,
1018                            char *fbuf, int len)
1019 {
1020         struct dirent *di;
1021         unsigned remainder;
1022         char *p;
1023         DIR *d;
1024         int start = flist->count;
1025
1026         if (!(d = opendir(fbuf))) {
1027                 io_error |= IOERR_GENERAL;
1028                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1029                 return;
1030         }
1031
1032         p = fbuf + len;
1033         if (len != 1 || *fbuf != '/')
1034                 *p++ = '/';
1035         *p = '\0';
1036         remainder = MAXPATHLEN - (p - fbuf);
1037
1038         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1039                 char *dname = d_name(di);
1040                 if (dname[0] == '.' && (dname[1] == '\0'
1041                     || (dname[1] == '.' && dname[2] == '\0')))
1042                         continue;
1043                 if (strlcpy(p, dname, remainder) >= remainder) {
1044                         io_error |= IOERR_GENERAL;
1045                         rprintf(FINFO,
1046                                 "cannot send long-named file %s\n",
1047                                 full_fname(fbuf));
1048                         continue;
1049                 }
1050
1051                 send_file_name(f, flist, fbuf, NULL, 0);
1052         }
1053
1054         fbuf[len] = '\0';
1055
1056         if (errno) {
1057                 io_error |= IOERR_GENERAL;
1058                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1059         }
1060
1061         closedir(d);
1062
1063         if (recurse) {
1064                 int i, end = flist->count - 1;
1065                 for (i = start; i <= end; i++)
1066                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1067         }
1068 }
1069
1070 struct file_list *send_file_list(int f, int argc, char *argv[])
1071 {
1072         int len;
1073         STRUCT_STAT st;
1074         char *p, *dir, olddir[sizeof curr_dir];
1075         char lastpath[MAXPATHLEN] = "";
1076         struct file_list *flist;
1077         struct timeval start_tv, end_tv;
1078         int64 start_write;
1079         int use_ff_fd = 0;
1080
1081         if (show_filelist_p())
1082                 start_filelist_progress("building file list");
1083
1084         start_write = stats.total_written;
1085         gettimeofday(&start_tv, NULL);
1086
1087         flist = flist_new(WITH_HLINK, "send_file_list");
1088
1089         io_start_buffering_out();
1090         if (filesfrom_fd >= 0) {
1091                 if (argv[0] && !push_dir(argv[0])) {
1092                         rsyserr(FERROR, errno, "push_dir %s failed",
1093                                 full_fname(argv[0]));
1094                         exit_cleanup(RERR_FILESELECT);
1095                 }
1096                 use_ff_fd = 1;
1097         }
1098
1099         while (1) {
1100                 char fbuf[MAXPATHLEN];
1101                 char *fn;
1102                 int is_dot_dir;
1103
1104                 if (use_ff_fd) {
1105                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1106                                 break;
1107                         sanitize_path(fbuf, fbuf, "", 0);
1108                 } else {
1109                         if (argc-- == 0)
1110                                 break;
1111                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1112                         if (sanitize_paths)
1113                                 sanitize_path(fbuf, fbuf, "", 0);
1114                 }
1115
1116                 len = strlen(fbuf);
1117                 if (relative_paths) {
1118                         /* We clean up fbuf below. */
1119                         is_dot_dir = 0;
1120                 } else if (!len || fbuf[len - 1] == '/') {
1121                         if (len == 2 && fbuf[0] == '.') {
1122                                 /* Turn "./" into just "." rather than "./." */
1123                                 fbuf[1] = '\0';
1124                         } else {
1125                                 if (len + 1 >= MAXPATHLEN)
1126                                         overflow_exit("send_file_list");
1127                                 fbuf[len++] = '.';
1128                                 fbuf[len] = '\0';
1129                         }
1130                         is_dot_dir = 1;
1131                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1132                     && (len == 2 || fbuf[len-3] == '/')) {
1133                         if (len + 2 >= MAXPATHLEN)
1134                                 overflow_exit("send_file_list");
1135                         fbuf[len++] = '/';
1136                         fbuf[len++] = '.';
1137                         fbuf[len] = '\0';
1138                         is_dot_dir = 1;
1139                 } else {
1140                         is_dot_dir = fbuf[len-1] == '.'
1141                                    && (len == 1 || fbuf[len-2] == '/');
1142                 }
1143
1144                 if (link_stat(fbuf, &st, keep_dirlinks) != 0) {
1145                         io_error |= IOERR_GENERAL;
1146                         rsyserr(FERROR, errno, "link_stat %s failed",
1147                                 full_fname(fbuf));
1148                         continue;
1149                 }
1150
1151                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1152                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1153                         continue;
1154                 }
1155
1156                 dir = NULL;
1157                 olddir[0] = '\0';
1158
1159                 if (!relative_paths) {
1160                         p = strrchr(fbuf, '/');
1161                         if (p) {
1162                                 *p = '\0';
1163                                 if (p == fbuf)
1164                                         dir = "/";
1165                                 else
1166                                         dir = fbuf;
1167                                 len -= p - fbuf + 1;
1168                                 fn = p + 1;
1169                         } else
1170                                 fn = fbuf;
1171                 } else {
1172                         if ((p = strstr(fbuf, "/./")) != NULL) {
1173                                 *p = '\0';
1174                                 if (p == fbuf)
1175                                         dir = "/";
1176                                 else
1177                                         dir = fbuf;
1178                                 len -= p - fbuf + 3;
1179                                 fn = p + 3;
1180                         } else
1181                                 fn = fbuf;
1182                         /* Get rid of trailing "/" and "/.". */
1183                         while (len) {
1184                                 if (fn[len - 1] == '/') {
1185                                         is_dot_dir = 1;
1186                                         if (!--len && !dir) {
1187                                                 len++;
1188                                                 break;
1189                                         }
1190                                 }
1191                                 else if (len >= 2 && fn[len - 1] == '.'
1192                                                   && fn[len - 2] == '/') {
1193                                         is_dot_dir = 1;
1194                                         if (!(len -= 2) && !dir) {
1195                                                 len++;
1196                                                 break;
1197                                         }
1198                                 } else
1199                                         break;
1200                         }
1201                         fn[len] = '\0';
1202                         /* Reject a ".." dir in the active part of the path. */
1203                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1204                                 if ((p[2] == '/' || p[2] == '\0')
1205                                  && (p == fn || p[-1] == '/')) {
1206                                         rprintf(FERROR,
1207                                             "found \"..\" dir in relative path: %s\n",
1208                                             fbuf);
1209                                         exit_cleanup(RERR_SYNTAX);
1210                                 }
1211                         }
1212                 }
1213
1214                 if (!*fn) {
1215                         len = 1;
1216                         fn = ".";
1217                 }
1218
1219                 if (dir && *dir) {
1220                         static char *lastdir;
1221                         static int lastdir_len;
1222
1223                         strlcpy(olddir, curr_dir, sizeof olddir);
1224
1225                         if (!push_dir(dir)) {
1226                                 io_error |= IOERR_GENERAL;
1227                                 rsyserr(FERROR, errno, "push_dir %s failed",
1228                                         full_fname(dir));
1229                                 continue;
1230                         }
1231
1232                         if (lastdir && strcmp(lastdir, dir) == 0) {
1233                                 flist_dir = lastdir;
1234                                 flist_dir_len = lastdir_len;
1235                         } else {
1236                                 flist_dir = lastdir = strdup(dir);
1237                                 flist_dir_len = lastdir_len = strlen(dir);
1238                         }
1239                 }
1240
1241                 if (fn != fbuf)
1242                         memmove(fbuf, fn, len + 1);
1243
1244                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1245                         /* Send the implied directories at the start of the
1246                          * source spec, so we get their permissions right. */
1247                         char *lp = lastpath, *slash = fbuf;
1248                         *p = '\0';
1249                         /* Skip any initial directories in our path that we
1250                          * have in common with lastpath. */
1251                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1252                                 if (*fn == '/')
1253                                         slash = fn;
1254                         }
1255                         *p = '/';
1256                         if (fn != p || (*lp && *lp != '/')) {
1257                                 int save_copy_links = copy_links;
1258                                 int save_xfer_dirs = xfer_dirs;
1259                                 copy_links = copy_unsafe_links;
1260                                 xfer_dirs = 1;
1261                                 while ((slash = strchr(slash+1, '/')) != 0) {
1262                                         *slash = '\0';
1263                                         send_file_name(f, flist, fbuf, NULL, 0);
1264                                         *slash = '/';
1265                                 }
1266                                 copy_links = save_copy_links;
1267                                 xfer_dirs = save_xfer_dirs;
1268                                 *p = '\0';
1269                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1270                                 *p = '/';
1271                         }
1272                 }
1273
1274                 if (one_file_system)
1275                         filesystem_dev = st.st_dev;
1276
1277                 if (recurse || (xfer_dirs && is_dot_dir)) {
1278                         struct file_struct *file;
1279                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1280                         if (file)
1281                                 send_if_directory(f, flist, file, fbuf, len);
1282                 } else
1283                         send_file_name(f, flist, fbuf, &st, 0);
1284
1285                 if (olddir[0]) {
1286                         flist_dir = NULL;
1287                         flist_dir_len = 0;
1288                         if (!pop_dir(olddir)) {
1289                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1290                                         full_fname(olddir));
1291                                 exit_cleanup(RERR_FILESELECT);
1292                         }
1293                 }
1294         }
1295
1296         gettimeofday(&end_tv, NULL);
1297         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1298                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1299         if (stats.flist_buildtime == 0)
1300                 stats.flist_buildtime = 1;
1301         start_tv = end_tv;
1302
1303         send_file_entry(NULL, f);
1304
1305         if (show_filelist_p())
1306                 finish_filelist_progress(flist);
1307
1308         gettimeofday(&end_tv, NULL);
1309         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1310                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1311
1312         if (flist->hlink_pool) {
1313                 pool_destroy(flist->hlink_pool);
1314                 flist->hlink_pool = NULL;
1315         }
1316
1317         /* Sort the list without removing any duplicates.  This allows the
1318          * receiving side to ask for any name they like, which gives us the
1319          * flexibility to change the way we unduplicate names in the future
1320          * without causing a compatibility problem with older versions. */
1321         clean_flist(flist, 0, 0);
1322
1323         send_uid_list(f);
1324
1325         /* send the io_error flag */
1326         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1327
1328         io_end_buffering();
1329         stats.flist_size = stats.total_written - start_write;
1330         stats.num_files = flist->count;
1331
1332         if (verbose > 3)
1333                 output_flist(flist);
1334
1335         if (verbose > 2)
1336                 rprintf(FINFO, "send_file_list done\n");
1337
1338         return flist;
1339 }
1340
1341 struct file_list *recv_file_list(int f)
1342 {
1343         struct file_list *flist;
1344         unsigned short flags;
1345         int64 start_read;
1346
1347         if (show_filelist_p())
1348                 start_filelist_progress("receiving file list");
1349
1350         start_read = stats.total_read;
1351
1352         flist = flist_new(WITH_HLINK, "recv_file_list");
1353
1354         flist->count = 0;
1355         flist->malloced = 1000;
1356         flist->files = new_array(struct file_struct *, flist->malloced);
1357         if (!flist->files)
1358                 goto oom;
1359
1360         while ((flags = read_byte(f)) != 0) {
1361                 struct file_struct *file;
1362
1363                 flist_expand(flist);
1364
1365                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1366                         flags |= read_byte(f) << 8;
1367                 file = receive_file_entry(flist, flags, f);
1368
1369                 if (S_ISREG(file->mode))
1370                         stats.total_size += file->length;
1371
1372                 flist->files[flist->count++] = file;
1373
1374                 maybe_emit_filelist_progress(flist->count);
1375
1376                 if (verbose > 2) {
1377                         rprintf(FINFO, "recv_file_name(%s)\n",
1378                                 f_name(file, NULL));
1379                 }
1380         }
1381         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1382
1383         if (verbose > 2)
1384                 rprintf(FINFO, "received %d names\n", flist->count);
1385
1386         if (show_filelist_p())
1387                 finish_filelist_progress(flist);
1388
1389         clean_flist(flist, relative_paths, 1);
1390
1391         if (f >= 0) {
1392                 recv_uid_list(f);
1393
1394                 /* Recv the io_error flag */
1395                 if (lp_ignore_errors(module_id) || ignore_errors)
1396                         read_int(f);
1397                 else
1398                         io_error |= read_int(f);
1399         }
1400
1401         if (verbose > 3)
1402                 output_flist(flist);
1403
1404         if (list_only) {
1405                 int i;
1406                 for (i = 0; i < flist->count; i++)
1407                         list_file_entry(flist->files[i]);
1408         }
1409
1410         if (verbose > 2)
1411                 rprintf(FINFO, "recv_file_list done\n");
1412
1413         stats.flist_size = stats.total_read - start_read;
1414         stats.num_files = flist->count;
1415
1416         return flist;
1417
1418   oom:
1419         out_of_memory("recv_file_list");
1420         return NULL;            /* not reached */
1421 }
1422
1423 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1424 {
1425         return f_name_cmp(*file1, *file2);
1426 }
1427
1428 /* Search for an identically-named item in the file list.  Note that the
1429  * items must agree in their directory-ness, or no match is returned. */
1430 int flist_find(struct file_list *flist, struct file_struct *f)
1431 {
1432         int low = flist->low, high = flist->high;
1433         int ret, mid, mid_up;
1434
1435         while (low <= high) {
1436                 mid = (low + high) / 2;
1437                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1438                 if (mid_up <= high)
1439                         ret = f_name_cmp(flist->files[mid_up], f);
1440                 else
1441                         ret = 1;
1442                 if (ret == 0) {
1443                         if (protocol_version < 29
1444                             && S_ISDIR(flist->files[mid_up]->mode)
1445                             != S_ISDIR(f->mode))
1446                                 return -1;
1447                         return mid_up;
1448                 }
1449                 if (ret > 0)
1450                         high = mid - 1;
1451                 else
1452                         low = mid_up + 1;
1453         }
1454         return -1;
1455 }
1456
1457 /*
1458  * Free up any resources a file_struct has allocated
1459  * and clear the file.
1460  */
1461 void clear_file(int i, struct file_list *flist)
1462 {
1463         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1464                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1465         memset(flist->files[i], 0, file_struct_len);
1466 }
1467
1468 /*
1469  * allocate a new file list
1470  */
1471 struct file_list *flist_new(int with_hlink, char *msg)
1472 {
1473         struct file_list *flist;
1474
1475         flist = new(struct file_list);
1476         if (!flist)
1477                 out_of_memory(msg);
1478
1479         memset(flist, 0, sizeof (struct file_list));
1480
1481         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1482             out_of_memory, POOL_INTERN)))
1483                 out_of_memory(msg);
1484
1485 #ifdef SUPPORT_HARD_LINKS
1486         if (with_hlink && preserve_hard_links) {
1487                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1488                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1489                         out_of_memory(msg);
1490         }
1491 #endif
1492
1493         return flist;
1494 }
1495
1496 /*
1497  * free up all elements in a flist
1498  */
1499 void flist_free(struct file_list *flist)
1500 {
1501         pool_destroy(flist->file_pool);
1502         pool_destroy(flist->hlink_pool);
1503         free(flist->files);
1504         free(flist);
1505 }
1506
1507 /*
1508  * This routine ensures we don't have any duplicate names in our file list.
1509  * duplicate names can cause corruption because of the pipelining
1510  */
1511 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1512 {
1513         int i, prev_i = 0;
1514
1515         if (!flist)
1516                 return;
1517         if (flist->count == 0) {
1518                 flist->high = -1;
1519                 return;
1520         }
1521
1522         qsort(flist->files, flist->count,
1523             sizeof flist->files[0], (int (*)())file_compare);
1524
1525         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1526                 if (flist->files[i]->basename) {
1527                         prev_i = i;
1528                         break;
1529                 }
1530         }
1531         flist->low = prev_i;
1532         while (++i < flist->count) {
1533                 int j;
1534                 struct file_struct *file = flist->files[i];
1535
1536                 if (!file->basename)
1537                         continue;
1538                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1539                         j = prev_i;
1540                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1541                         int save_mode = file->mode;
1542                         /* Make sure that this directory doesn't duplicate a
1543                          * non-directory earlier in the list. */
1544                         flist->high = prev_i;
1545                         file->mode = S_IFREG;
1546                         j = flist_find(flist, file);
1547                         file->mode = save_mode;
1548                 } else
1549                         j = -1;
1550                 if (j >= 0) {
1551                         struct file_struct *fp = flist->files[j];
1552                         int keep, drop;
1553                         /* If one is a dir and the other is not, we want to
1554                          * keep the dir because it might have contents in the
1555                          * list. */
1556                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1557                                 if (S_ISDIR(file->mode))
1558                                         keep = i, drop = j;
1559                                 else
1560                                         keep = j, drop = i;
1561                         } else
1562                                 keep = j, drop = i;
1563                         if (verbose > 1 && !am_server) {
1564                                 rprintf(FINFO,
1565                                         "removing duplicate name %s from file list (%d)\n",
1566                                         f_name(file, NULL), drop);
1567                         }
1568                         /* Make sure that if we unduplicate '.', that we don't
1569                          * lose track of a user-specified top directory. */
1570                         flist->files[keep]->flags |= flist->files[drop]->flags
1571                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1572
1573                         clear_file(drop, flist);
1574
1575                         if (keep == i) {
1576                                 if (flist->low == drop) {
1577                                         for (j = drop + 1;
1578                                              j < i && !flist->files[j]->basename;
1579                                              j++) {}
1580                                         flist->low = j;
1581                                 }
1582                                 prev_i = i;
1583                         }
1584                 } else
1585                         prev_i = i;
1586         }
1587         flist->high = no_dups ? prev_i : flist->count - 1;
1588
1589         if (strip_root) {
1590                 /* We need to strip off the leading slashes for relative
1591                  * paths, but this must be done _after_ the sorting phase. */
1592                 for (i = flist->low; i <= flist->high; i++) {
1593                         struct file_struct *file = flist->files[i];
1594
1595                         if (!file->dirname)
1596                                 continue;
1597                         if (*file->dirname == '/') {
1598                                 char *s = file->dirname + 1;
1599                                 while (*s == '/') s++;
1600                                 memmove(file->dirname, s, strlen(s) + 1);
1601                         }
1602
1603                         if (!*file->dirname)
1604                                 file->dirname = NULL;
1605                 }
1606         }
1607 }
1608
1609 static void output_flist(struct file_list *flist)
1610 {
1611         char uidbuf[16], gidbuf[16], depthbuf[16];
1612         struct file_struct *file;
1613         const char *who = who_am_i();
1614         int i;
1615
1616         for (i = 0; i < flist->count; i++) {
1617                 file = flist->files[i];
1618                 if ((am_root || am_sender) && preserve_uid)
1619                         sprintf(uidbuf, " uid=%ld", (long)file->ids->uid);
1620                 else
1621                         *uidbuf = '\0';
1622                 if (preserve_gid && file->ids->gid != GID_NONE)
1623                         sprintf(gidbuf, " gid=%ld", (long)file->ids->gid);
1624                 else
1625                         *gidbuf = '\0';
1626                 if (!am_sender)
1627                         sprintf(depthbuf, "%d", file->dir.depth);
1628                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1629                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1630                         file->dirname ? file->dirname : "",
1631                         file->dirname ? "/" : "", NS(file->basename),
1632                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1633                         (double)file->length, uidbuf, gidbuf, file->flags);
1634         }
1635 }
1636
1637 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1638 enum fnc_type { t_PATH, t_ITEM };
1639
1640 /* Compare the names of two file_struct entities, similar to how strcmp()
1641  * would do if it were operating on the joined strings.
1642  *
1643  * Some differences beginning with protocol_version 29: (1) directory names
1644  * are compared with an assumed trailing slash so that they compare in a
1645  * way that would cause them to sort immediately prior to any content they
1646  * may have; (2) a directory of any name compares after a non-directory of
1647  * any name at the same depth; (3) a directory with name "." compares prior
1648  * to anything else.  These changes mean that a directory and a non-dir
1649  * with the same name will not compare as equal (protocol_version >= 29).
1650  *
1651  * The dirname component can be an empty string, but the basename component
1652  * cannot (and never is in the current codebase).  The basename component
1653  * may be NULL (for a removed item), in which case it is considered to be
1654  * after any existing item. */
1655 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1656 {
1657         int dif;
1658         const uchar *c1, *c2;
1659         enum fnc_state state1, state2;
1660         enum fnc_type type1, type2;
1661         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1662
1663         if (!f1 || !f1->basename) {
1664                 if (!f2 || !f2->basename)
1665                         return 0;
1666                 return -1;
1667         }
1668         if (!f2 || !f2->basename)
1669                 return 1;
1670
1671         c1 = (uchar*)f1->dirname;
1672         c2 = (uchar*)f2->dirname;
1673         if (c1 == c2)
1674                 c1 = c2 = NULL;
1675         if (!c1) {
1676                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1677                 c1 = (uchar*)f1->basename;
1678                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1679                         type1 = t_ITEM;
1680                         state1 = s_TRAILING;
1681                         c1 = (uchar*)"";
1682                 } else
1683                         state1 = s_BASE;
1684         } else if (!*c1) {
1685                 type1 = t_path;
1686                 state1 = s_SLASH;
1687                 c1 = (uchar*)"/";
1688         } else {
1689                 type1 = t_path;
1690                 state1 = s_DIR;
1691         }
1692         if (!c2) {
1693                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1694                 c2 = (uchar*)f2->basename;
1695                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1696                         type2 = t_ITEM;
1697                         state2 = s_TRAILING;
1698                         c2 = (uchar*)"";
1699                 } else
1700                         state2 = s_BASE;
1701         } else if (!*c2) {
1702                 type2 = t_path;
1703                 state2 = s_SLASH;
1704                 c2 = (uchar*)"/";
1705         } else {
1706                 type2 = t_path;
1707                 state2 = s_DIR;
1708         }
1709
1710         if (type1 != type2)
1711                 return type1 == t_PATH ? 1 : -1;
1712
1713         while (1) {
1714                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1715                         break;
1716                 if (!*c1) {
1717                         switch (state1) {
1718                         case s_DIR:
1719                                 state1 = s_SLASH;
1720                                 c1 = (uchar*)"/";
1721                                 break;
1722                         case s_SLASH:
1723                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1724                                 c1 = (uchar*)f1->basename;
1725                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1726                                         type1 = t_ITEM;
1727                                         state1 = s_TRAILING;
1728                                         c1 = (uchar*)"";
1729                                 } else
1730                                         state1 = s_BASE;
1731                                 break;
1732                         case s_BASE:
1733                                 state1 = s_TRAILING;
1734                                 if (type1 == t_PATH) {
1735                                         c1 = (uchar*)"/";
1736                                         break;
1737                                 }
1738                                 /* FALL THROUGH */
1739                         case s_TRAILING:
1740                                 type1 = t_ITEM;
1741                                 break;
1742                         }
1743                         if (*c2 && type1 != type2)
1744                                 return type1 == t_PATH ? 1 : -1;
1745                 }
1746                 if (!*c2) {
1747                         switch (state2) {
1748                         case s_DIR:
1749                                 state2 = s_SLASH;
1750                                 c2 = (uchar*)"/";
1751                                 break;
1752                         case s_SLASH:
1753                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1754                                 c2 = (uchar*)f2->basename;
1755                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1756                                         type2 = t_ITEM;
1757                                         state2 = s_TRAILING;
1758                                         c2 = (uchar*)"";
1759                                 } else
1760                                         state2 = s_BASE;
1761                                 break;
1762                         case s_BASE:
1763                                 state2 = s_TRAILING;
1764                                 if (type2 == t_PATH) {
1765                                         c2 = (uchar*)"/";
1766                                         break;
1767                                 }
1768                                 /* FALL THROUGH */
1769                         case s_TRAILING:
1770                                 if (!*c1)
1771                                         return 0;
1772                                 type2 = t_ITEM;
1773                                 break;
1774                         }
1775                         if (type1 != type2)
1776                                 return type1 == t_PATH ? 1 : -1;
1777                 }
1778         }
1779
1780         return dif;
1781 }
1782
1783 /* Return a copy of the full filename of a flist entry, using the indicated
1784  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1785  * done because we checked the size when creating the file_struct entry.
1786  */
1787 char *f_name(struct file_struct *f, char *fbuf)
1788 {
1789         if (!f || !f->basename)
1790                 return NULL;
1791
1792         if (!fbuf) {
1793                 static char names[5][MAXPATHLEN];
1794                 static unsigned int n;
1795
1796                 n = (n + 1) % (sizeof names / sizeof names[0]);
1797
1798                 fbuf = names[n];
1799         }
1800
1801         if (f->dirname) {
1802                 int len = strlen(f->dirname);
1803                 memcpy(fbuf, f->dirname, len);
1804                 fbuf[len] = '/';
1805                 strcpy(fbuf + len + 1, f->basename);
1806         } else
1807                 strcpy(fbuf, f->basename);
1808
1809         return fbuf;
1810 }
1811
1812 /* Do a non-recursive scan of the named directory, possibly ignoring all
1813  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1814  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1815  * buffer (the functions we call will append names onto the end, but the old
1816  * dir value will be restored on exit). */
1817 struct file_list *get_dirlist(char *dirname, int dlen,
1818                               int ignore_filter_rules)
1819 {
1820         struct file_list *dirlist;
1821         char dirbuf[MAXPATHLEN];
1822         int save_recurse = recurse;
1823
1824         if (dlen < 0) {
1825                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1826                 if (dlen >= MAXPATHLEN)
1827                         return NULL;
1828                 dirname = dirbuf;
1829         }
1830
1831         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1832
1833         recurse = 0;
1834         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1835         recurse = save_recurse;
1836         if (do_progress)
1837                 flist_count_offset += dirlist->count;
1838
1839         clean_flist(dirlist, 0, 0);
1840
1841         if (verbose > 3)
1842                 output_flist(dirlist);
1843
1844         return dirlist;
1845 }