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 (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->flags = 0;
 623         file->modtime = modtime;
 624         file->length = file_length;
 625         file->mode = mode;
 626         file->uid = uid;
 627         file->gid = gid;
 628
 629         if (dirname_len) {
 630                 file->dirname = lastdir = bp;
 631                 lastdir_len = dirname_len - 1;
 632                 memcpy(bp, dirname, dirname_len - 1);
 633                 bp += dirname_len;
 634                 bp[-1] = '\0';
 635                 lastdir_depth = count_dir_elements(lastdir);
 636                 file->dir.depth = lastdir_depth + 1;
 637         } else if (dirname) {
 638                 file->dirname = dirname; /* we're reusing lastname */
 639                 file->dir.depth = lastdir_depth + 1;
 640         } else
 641                 file->dir.depth = 1;
 642
 643         if (S_ISDIR(mode)) {
 644                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 645                         file->dir.depth--;
 646                 if (flags & XMIT_TOP_DIR) {
 647                         in_del_hier = recurse;
 648                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 649                         if (relative_paths && del_hier_name_len > 2
 650                             && lastname[del_hier_name_len-1] == '.'
 651                             && lastname[del_hier_name_len-2] == '/')
 652                                 del_hier_name_len -= 2;
 653                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 654                 } else if (in_del_hier) {
 655                         if (!relative_paths || !del_hier_name_len
 656                          || (l1 >= del_hier_name_len
 657                           && lastname[del_hier_name_len] == '/'))
 658                                 file->flags |= FLAG_DEL_HERE;
 659                         else
 660                                 in_del_hier = 0;
 661                 }
 662         }
 663
 664         file->basename = bp;
 665         memcpy(bp, basename, basename_len);
 666         bp += basename_len;
 667
 668         if (preserve_devices && IS_DEVICE(mode))
 669                 file->u.rdev = rdev;
 670
 671 #ifdef SUPPORT_LINKS
 672         if (linkname_len) {
 673                 file->u.link = bp;
 674                 read_sbuf(f, bp, linkname_len - 1);
 675                 if (sanitize_paths)
 676                         sanitize_path(bp, bp, "", lastdir_depth);
 677                 bp += linkname_len;
 678         }
 679 #endif
 680
 681 #ifdef SUPPORT_HARD_LINKS
 682         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 683                 flags |= XMIT_HAS_IDEV_DATA;
 684         if (flags & XMIT_HAS_IDEV_DATA) {
 685                 int64 inode;
 686                 if (protocol_version < 26) {
 687                         dev = read_int(f);
 688                         inode = read_int(f);
 689                 } else {
 690                         if (!(flags & XMIT_SAME_DEV))
 691                                 dev = read_longint(f);
 692                         inode = read_longint(f);
 693                 }
 694                 if (flist->hlink_pool) {
 695                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 696                             struct idev, 1, "inode_table");
 697                         file->F_INODE = inode;
 698                         file->F_DEV = dev;
 699                 }
 700         }
 701 #endif
 702
 703         if (always_checksum && (sum_len || protocol_version < 28)) {
 704                 char *sum;
 705                 if (sum_len) {
 706                         file->u.sum = sum = bp;
 707                         /*bp += sum_len;*/
 708                 } else {
 709                         /* Prior to 28, we get a useless set of nulls. */
 710                         sum = empty_sum;
 711                 }
 712                 read_buf(f, sum, checksum_len);
 713         }
 714
 715         if (!preserve_perms) {
 716                 /* set an appropriate set of permissions based on original
 717                  * permissions and umask. This emulates what GNU cp does */
 718                 file->mode &= ~orig_umask;
 719         }
 720
 721         return file;
 722 }
 723
 724 /**
 725  * Create a file_struct for a named file by reading its stat()
 726  * information and performing extensive checks against global
 727  * options.
 728  *
 729  * @return the new file, or NULL if there was an error or this file
 730  * should be excluded.
 731  *
 732  * @todo There is a small optimization opportunity here to avoid
 733  * stat()ing the file in some circumstances, which has a certain cost.
 734  * We are called immediately after doing readdir(), and so we may
 735  * already know the d_type of the file.  We could for example avoid
 736  * statting directories if we're not recursing, but this is not a very
 737  * important case.  Some systems may not have d_type.
 738  **/
 739 struct file_struct *make_file(char *fname, struct file_list *flist,
 740                               STRUCT_STAT *stp, unsigned short flags,
 741                               int filter_level)
 742 {
 743         static char *lastdir;
 744         static int lastdir_len = -1;
 745         struct file_struct *file;
 746         STRUCT_STAT st;
 747         char sum[SUM_LENGTH];
 748         char thisname[MAXPATHLEN];
 749         char linkname[MAXPATHLEN];
 750         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 751         char *basename, *dirname, *bp;
 752
 753         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 754                 lastdir_len = -1;
 755
 756         if (strlcpy(thisname, fname, sizeof thisname)
 757             >= sizeof thisname - flist_dir_len) {
 758                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 759                 return NULL;
 760         }
 761         clean_fname(thisname, 0);
 762         if (sanitize_paths)
 763                 sanitize_path(thisname, thisname, "", 0);
 764
 765         memset(sum, 0, SUM_LENGTH);
 766
 767         if (stp && S_ISDIR(stp->st_mode))
 768                 st = *stp; /* Needed for "symlink/." with --relative. */
 769         else if (readlink_stat(thisname, &st, linkname) != 0) {
 770                 int save_errno = errno;
 771                 /* See if file is excluded before reporting an error. */
 772                 if (filter_level != NO_FILTERS
 773                     && is_excluded(thisname, 0, filter_level))
 774                         return NULL;
 775                 if (save_errno == ENOENT) {
 776 #ifdef SUPPORT_LINKS
 777                         /* Avoid "vanished" error if symlink points nowhere. */
 778                         if (copy_links && do_lstat(thisname, &st) == 0
 779                             && S_ISLNK(st.st_mode)) {
 780                                 io_error |= IOERR_GENERAL;
 781                                 rprintf(FERROR, "symlink has no referent: %s\n",
 782                                         full_fname(thisname));
 783                         } else
 784 #endif
 785                         {
 786                                 enum logcode c = am_daemon && protocol_version < 28
 787                                     ? FERROR : FINFO;
 788                                 io_error |= IOERR_VANISHED;
 789                                 rprintf(c, "file has vanished: %s\n",
 790                                         full_fname(thisname));
 791                         }
 792                 } else {
 793                         io_error |= IOERR_GENERAL;
 794                         rsyserr(FERROR, save_errno, "readlink %s failed",
 795                                 full_fname(thisname));
 796                 }
 797                 return NULL;
 798         }
 799
 800         /* backup.c calls us with filter_level set to NO_FILTERS. */
 801         if (filter_level == NO_FILTERS)
 802                 goto skip_filters;
 803
 804         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 805                 rprintf(FINFO, "skipping directory %s\n", thisname);
 806                 return NULL;
 807         }
 808
 809         /* We only care about directories because we need to avoid recursing
 810          * into a mount-point directory, not to avoid copying a symlinked
 811          * file if -L (or similar) was specified. */
 812         if (one_file_system && st.st_dev != filesystem_dev
 813          && S_ISDIR(st.st_mode)) {
 814                 if (one_file_system > 1) {
 815                         if (verbose > 2) {
 816                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 817                                         thisname);
 818                         }
 819                         return NULL;
 820                 }
 821                 flags |= FLAG_MOUNT_POINT;
 822         }
 823
 824         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 825                 return NULL;
 826
 827         if (lp_ignore_nonreadable(module_id)) {
 828 #ifdef SUPPORT_LINKS
 829                 if (!S_ISLNK(st.st_mode))
 830 #endif
 831                         if (access(thisname, R_OK) != 0)
 832                                 return NULL;
 833         }
 834
 835   skip_filters:
 836
 837         if (verbose > 2) {
 838                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 839                         who_am_i(), thisname, filter_level);
 840         }
 841
 842         if ((basename = strrchr(thisname, '/')) != NULL) {
 843                 dirname_len = ++basename - thisname; /* counts future '\0' */
 844                 if (lastdir_len == dirname_len - 1
 845                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 846                         dirname = lastdir;
 847                         dirname_len = 0; /* indicates no copy is needed */
 848                 } else
 849                         dirname = thisname;
 850         } else {
 851                 basename = thisname;
 852                 dirname = NULL;
 853                 dirname_len = 0;
 854         }
 855         basename_len = strlen(basename) + 1; /* count the '\0' */
 856
 857 #ifdef SUPPORT_LINKS
 858         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 859 #else
 860         linkname_len = 0;
 861 #endif
 862
 863         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 864                 ? MD4_SUM_LENGTH : 0;
 865
 866         alloc_len = file_struct_len + dirname_len + basename_len
 867             + linkname_len + sum_len;
 868         if (flist)
 869                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 870         else {
 871                 if (!(bp = new_array(char, alloc_len)))
 872                         out_of_memory("make_file");
 873         }
 874
 875         file = (struct file_struct *)bp;
 876         memset(bp, 0, file_struct_len);
 877         bp += file_struct_len;
 878
 879         file->flags = flags;
 880         file->modtime = st.st_mtime;
 881         file->length = st.st_size;
 882         file->mode = st.st_mode;
 883         file->uid = st.st_uid;
 884         file->gid = st.st_gid;
 885
 886 #ifdef SUPPORT_HARD_LINKS
 887         if (flist && flist->hlink_pool) {
 888                 if (protocol_version < 28) {
 889                         if (S_ISREG(st.st_mode))
 890                                 file->link_u.idev = pool_talloc(
 891                                     flist->hlink_pool, struct idev, 1,
 892                                     "inode_table");
 893                 } else {
 894                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 895                                 file->link_u.idev = pool_talloc(
 896                                     flist->hlink_pool, struct idev, 1,
 897                                     "inode_table");
 898                 }
 899         }
 900         if (file->link_u.idev) {
 901                 file->F_DEV = st.st_dev;
 902                 file->F_INODE = st.st_ino;
 903         }
 904 #endif
 905
 906         if (dirname_len) {
 907                 file->dirname = lastdir = bp;
 908                 lastdir_len = dirname_len - 1;
 909                 memcpy(bp, dirname, dirname_len - 1);
 910                 bp += dirname_len;
 911                 bp[-1] = '\0';
 912         } else if (dirname)
 913                 file->dirname = dirname;
 914
 915         file->basename = bp;
 916         memcpy(bp, basename, basename_len);
 917         bp += basename_len;
 918
 919 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 920         if (preserve_devices && IS_DEVICE(st.st_mode))
 921                 file->u.rdev = st.st_rdev;
 922 #endif
 923
 924 #ifdef SUPPORT_LINKS
 925         if (linkname_len) {
 926                 file->u.link = bp;
 927                 memcpy(bp, linkname, linkname_len);
 928                 bp += linkname_len;
 929         }
 930 #endif
 931
 932         if (sum_len) {
 933                 file->u.sum = bp;
 934                 file_checksum(thisname, bp, st.st_size);
 935                 /*bp += sum_len;*/
 936         }
 937
 938         file->dir.root = flist_dir;
 939
 940         /* This code is only used by the receiver when it is building
 941          * a list of files for a delete pass. */
 942         if (keep_dirlinks && linkname_len && flist) {
 943                 STRUCT_STAT st2;
 944                 int save_mode = file->mode;
 945                 file->mode = S_IFDIR; /* Find a directory with our name. */
 946                 if (flist_find(the_file_list, file) >= 0
 947                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 948                         file->modtime = st2.st_mtime;
 949                         file->length = st2.st_size;
 950                         file->mode = st2.st_mode;
 951                         file->uid = st2.st_uid;
 952                         file->gid = st2.st_gid;
 953                         file->u.link = NULL;
 954                 } else
 955                         file->mode = save_mode;
 956         }
 957
 958         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 959                 stats.total_size += st.st_size;
 960
 961         return file;
 962 }
 963
 964 static struct file_struct *send_file_name(int f, struct file_list *flist,
 965                                           char *fname, STRUCT_STAT *stp,
 966                                           unsigned short flags)
 967 {
 968         struct file_struct *file;
 969
 970         file = make_file(fname, flist, stp, flags,
 971                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 972         if (!file)
 973                 return NULL;
 974
 975         if (chmod_modes && !S_ISLNK(file->mode))
 976                 file->mode = tweak_mode(file->mode, chmod_modes);
 977
 978         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 979
 980         flist_expand(flist);
 981
 982         if (file->basename[0]) {
 983                 flist->files[flist->count++] = file;
 984                 send_file_entry(file, f);
 985         }
 986         return file;
 987 }
 988
 989 static void send_if_directory(int f, struct file_list *flist,
 990                               struct file_struct *file,
 991                               char *fbuf, unsigned int ol)
 992 {
 993         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 994
 995         if (S_ISDIR(file->mode)
 996             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 997                 void *save_filters;
 998                 unsigned int len = strlen(fbuf);
 999                 if (len > 1 && fbuf[len-1] == '/')
1000                         fbuf[--len] = '\0';
1001                 if (len >= MAXPATHLEN - 1) {
1002                         io_error |= IOERR_GENERAL;
1003                         rprintf(FERROR, "skipping long-named directory: %s\n",
1004                                 full_fname(fbuf));
1005                         return;
1006                 }
1007                 save_filters = push_local_filters(fbuf, len);
1008                 send_directory(f, flist, fbuf, len);
1009                 pop_local_filters(save_filters);
1010                 fbuf[ol] = '\0';
1011                 if (is_dot_dir)
1012                         fbuf[ol-1] = '.';
1013         }
1014 }
1015
1016 /* This function is normally called by the sender, but the receiving side also
1017  * calls it from get_dirlist() with f set to -1 so that we just construct the
1018  * file list in memory without sending it over the wire.  Also, get_dirlist()
1019  * might call this with f set to -2, which also indicates that local filter
1020  * rules should be ignored. */
1021 static void send_directory(int f, struct file_list *flist,
1022                            char *fbuf, int len)
1023 {
1024         struct dirent *di;
1025         unsigned remainder;
1026         char *p;
1027         DIR *d;
1028         int start = flist->count;
1029
1030         if (!(d = opendir(fbuf))) {
1031                 io_error |= IOERR_GENERAL;
1032                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1033                 return;
1034         }
1035
1036         p = fbuf + len;
1037         if (len != 1 || *fbuf != '/')
1038                 *p++ = '/';
1039         *p = '\0';
1040         remainder = MAXPATHLEN - (p - fbuf);
1041
1042         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1043                 char *dname = d_name(di);
1044                 if (dname[0] == '.' && (dname[1] == '\0'
1045                     || (dname[1] == '.' && dname[2] == '\0')))
1046                         continue;
1047                 if (strlcpy(p, dname, remainder) >= remainder) {
1048                         io_error |= IOERR_GENERAL;
1049                         rprintf(FINFO,
1050                                 "cannot send long-named file %s\n",
1051                                 full_fname(fbuf));
1052                         continue;
1053                 }
1054
1055                 send_file_name(f, flist, fbuf, NULL, 0);
1056         }
1057
1058         fbuf[len] = '\0';
1059
1060         if (errno) {
1061                 io_error |= IOERR_GENERAL;
1062                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1063         }
1064
1065         closedir(d);
1066
1067         if (recurse) {
1068                 int i, end = flist->count - 1;
1069                 for (i = start; i <= end; i++)
1070                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1071         }
1072 }
1073
1074 struct file_list *send_file_list(int f, int argc, char *argv[])
1075 {
1076         int len;
1077         STRUCT_STAT st;
1078         char *p, *dir, olddir[sizeof curr_dir];
1079         char lastpath[MAXPATHLEN] = "";
1080         struct file_list *flist;
1081         struct timeval start_tv, end_tv;
1082         int64 start_write;
1083         int use_ff_fd = 0;
1084
1085         if (show_filelist_p())
1086                 start_filelist_progress("building file list");
1087
1088         start_write = stats.total_written;
1089         gettimeofday(&start_tv, NULL);
1090
1091         flist = flist_new(WITH_HLINK, "send_file_list");
1092
1093         io_start_buffering_out();
1094         if (filesfrom_fd >= 0) {
1095                 if (argv[0] && !push_dir(argv[0])) {
1096                         rsyserr(FERROR, errno, "push_dir %s failed",
1097                                 full_fname(argv[0]));
1098                         exit_cleanup(RERR_FILESELECT);
1099                 }
1100                 use_ff_fd = 1;
1101         }
1102
1103         while (1) {
1104                 char fbuf[MAXPATHLEN];
1105                 char *fn;
1106                 int is_dot_dir;
1107
1108                 if (use_ff_fd) {
1109                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1110                                 break;
1111                         sanitize_path(fbuf, fbuf, "", 0);
1112                 } else {
1113                         if (argc-- == 0)
1114                                 break;
1115                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1116                         if (sanitize_paths)
1117                                 sanitize_path(fbuf, fbuf, "", 0);
1118                 }
1119
1120                 len = strlen(fbuf);
1121                 if (relative_paths) {
1122                         /* We clean up fbuf below. */
1123                         is_dot_dir = 0;
1124                 } else if (!len || fbuf[len - 1] == '/') {
1125                         if (len == 2 && fbuf[0] == '.') {
1126                                 /* Turn "./" into just "." rather than "./." */
1127                                 fbuf[1] = '\0';
1128                         } else {
1129                                 if (len + 1 >= MAXPATHLEN)
1130                                         overflow_exit("send_file_list");
1131                                 fbuf[len++] = '.';
1132                                 fbuf[len] = '\0';
1133                         }
1134                         is_dot_dir = 1;
1135                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1136                     && (len == 2 || fbuf[len-3] == '/')) {
1137                         if (len + 2 >= MAXPATHLEN)
1138                                 overflow_exit("send_file_list");
1139                         fbuf[len++] = '/';
1140                         fbuf[len++] = '.';
1141                         fbuf[len] = '\0';
1142                         is_dot_dir = 1;
1143                 } else {
1144                         is_dot_dir = fbuf[len-1] == '.'
1145                                    && (len == 1 || fbuf[len-2] == '/');
1146                 }
1147
1148                 if (link_stat(fbuf, &st, keep_dirlinks) != 0) {
1149                         io_error |= IOERR_GENERAL;
1150                         rsyserr(FERROR, errno, "link_stat %s failed",
1151                                 full_fname(fbuf));
1152                         continue;
1153                 }
1154
1155                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1156                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1157                         continue;
1158                 }
1159
1160                 dir = NULL;
1161                 olddir[0] = '\0';
1162
1163                 if (!relative_paths) {
1164                         p = strrchr(fbuf, '/');
1165                         if (p) {
1166                                 *p = '\0';
1167                                 if (p == fbuf)
1168                                         dir = "/";
1169                                 else
1170                                         dir = fbuf;
1171                                 len -= p - fbuf + 1;
1172                                 fn = p + 1;
1173                         } else
1174                                 fn = fbuf;
1175                 } else {
1176                         if ((p = strstr(fbuf, "/./")) != NULL) {
1177                                 *p = '\0';
1178                                 if (p == fbuf)
1179                                         dir = "/";
1180                                 else
1181                                         dir = fbuf;
1182                                 len -= p - fbuf + 3;
1183                                 fn = p + 3;
1184                         } else
1185                                 fn = fbuf;
1186                         /* Get rid of trailing "/" and "/.". */
1187                         while (len) {
1188                                 if (fn[len - 1] == '/') {
1189                                         is_dot_dir = 1;
1190                                         if (!--len && !dir) {
1191                                                 len++;
1192                                                 break;
1193                                         }
1194                                 }
1195                                 else if (len >= 2 && fn[len - 1] == '.'
1196                                                   && fn[len - 2] == '/') {
1197                                         is_dot_dir = 1;
1198                                         if (!(len -= 2) && !dir) {
1199                                                 len++;
1200                                                 break;
1201                                         }
1202                                 } else
1203                                         break;
1204                         }
1205                         fn[len] = '\0';
1206                         /* Reject a ".." dir in the active part of the path. */
1207                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1208                                 if ((p[2] == '/' || p[2] == '\0')
1209                                  && (p == fn || p[-1] == '/')) {
1210                                         rprintf(FERROR,
1211                                             "found \"..\" dir in relative path: %s\n",
1212                                             fbuf);
1213                                         exit_cleanup(RERR_SYNTAX);
1214                                 }
1215                         }
1216                 }
1217
1218                 if (!*fn) {
1219                         len = 1;
1220                         fn = ".";
1221                 }
1222
1223                 if (dir && *dir) {
1224                         static char *lastdir;
1225                         static int lastdir_len;
1226
1227                         strlcpy(olddir, curr_dir, sizeof olddir);
1228
1229                         if (!push_dir(dir)) {
1230                                 io_error |= IOERR_GENERAL;
1231                                 rsyserr(FERROR, errno, "push_dir %s failed",
1232                                         full_fname(dir));
1233                                 continue;
1234                         }
1235
1236                         if (lastdir && strcmp(lastdir, dir) == 0) {
1237                                 flist_dir = lastdir;
1238                                 flist_dir_len = lastdir_len;
1239                         } else {
1240                                 flist_dir = lastdir = strdup(dir);
1241                                 flist_dir_len = lastdir_len = strlen(dir);
1242                         }
1243                 }
1244
1245                 if (fn != fbuf)
1246                         memmove(fbuf, fn, len + 1);
1247
1248                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1249                         /* Send the implied directories at the start of the
1250                          * source spec, so we get their permissions right. */
1251                         char *lp = lastpath, *slash = fbuf;
1252                         *p = '\0';
1253                         /* Skip any initial directories in our path that we
1254                          * have in common with lastpath. */
1255                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1256                                 if (*fn == '/')
1257                                         slash = fn;
1258                         }
1259                         *p = '/';
1260                         if (fn != p || (*lp && *lp != '/')) {
1261                                 int save_copy_links = copy_links;
1262                                 int save_xfer_dirs = xfer_dirs;
1263                                 copy_links = copy_unsafe_links;
1264                                 xfer_dirs = 1;
1265                                 while ((slash = strchr(slash+1, '/')) != 0) {
1266                                         *slash = '\0';
1267                                         send_file_name(f, flist, fbuf, NULL, 0);
1268                                         *slash = '/';
1269                                 }
1270                                 copy_links = save_copy_links;
1271                                 xfer_dirs = save_xfer_dirs;
1272                                 *p = '\0';
1273                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1274                                 *p = '/';
1275                         }
1276                 }
1277
1278                 if (one_file_system)
1279                         filesystem_dev = st.st_dev;
1280
1281                 if (recurse || (xfer_dirs && is_dot_dir)) {
1282                         struct file_struct *file;
1283                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1284                         if (file)
1285                                 send_if_directory(f, flist, file, fbuf, len);
1286                 } else
1287                         send_file_name(f, flist, fbuf, &st, 0);
1288
1289                 if (olddir[0]) {
1290                         flist_dir = NULL;
1291                         flist_dir_len = 0;
1292                         if (!pop_dir(olddir)) {
1293                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1294                                         full_fname(olddir));
1295                                 exit_cleanup(RERR_FILESELECT);
1296                         }
1297                 }
1298         }
1299
1300         gettimeofday(&end_tv, NULL);
1301         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1302                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1303         if (stats.flist_buildtime == 0)
1304                 stats.flist_buildtime = 1;
1305         start_tv = end_tv;
1306
1307         send_file_entry(NULL, f);
1308
1309         if (show_filelist_p())
1310                 finish_filelist_progress(flist);
1311
1312         gettimeofday(&end_tv, NULL);
1313         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1314                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1315
1316         if (flist->hlink_pool) {
1317                 pool_destroy(flist->hlink_pool);
1318                 flist->hlink_pool = NULL;
1319         }
1320
1321         /* Sort the list without removing any duplicates.  This allows the
1322          * receiving side to ask for any name they like, which gives us the
1323          * flexibility to change the way we unduplicate names in the future
1324          * without causing a compatibility problem with older versions. */
1325         clean_flist(flist, 0, 0);
1326
1327         /* Now send the uid/gid list. This was introduced in
1328          * protocol version 15 */
1329         send_uid_list(f);
1330
1331         /* send the io_error flag */
1332         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1333
1334         io_end_buffering();
1335         stats.flist_size = stats.total_written - start_write;
1336         stats.num_files = flist->count;
1337
1338         if (verbose > 3)
1339                 output_flist(flist);
1340
1341         if (verbose > 2)
1342                 rprintf(FINFO, "send_file_list done\n");
1343
1344         return flist;
1345 }
1346
1347 struct file_list *recv_file_list(int f)
1348 {
1349         struct file_list *flist;
1350         unsigned short flags;
1351         int64 start_read;
1352
1353         if (show_filelist_p())
1354                 start_filelist_progress("receiving file list");
1355
1356         start_read = stats.total_read;
1357
1358         flist = flist_new(WITH_HLINK, "recv_file_list");
1359
1360         flist->count = 0;
1361         flist->malloced = 1000;
1362         flist->files = new_array(struct file_struct *, flist->malloced);
1363         if (!flist->files)
1364                 goto oom;
1365
1366         while ((flags = read_byte(f)) != 0) {
1367                 struct file_struct *file;
1368
1369                 flist_expand(flist);
1370
1371                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1372                         flags |= read_byte(f) << 8;
1373                 file = receive_file_entry(flist, flags, f);
1374
1375                 if (S_ISREG(file->mode))
1376                         stats.total_size += file->length;
1377
1378                 flist->files[flist->count++] = file;
1379
1380                 maybe_emit_filelist_progress(flist->count);
1381
1382                 if (verbose > 2) {
1383                         rprintf(FINFO, "recv_file_name(%s)\n",
1384                                 f_name(file, NULL));
1385                 }
1386         }
1387         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1388
1389         if (verbose > 2)
1390                 rprintf(FINFO, "received %d names\n", flist->count);
1391
1392         if (show_filelist_p())
1393                 finish_filelist_progress(flist);
1394
1395         clean_flist(flist, relative_paths, 1);
1396
1397         if (f >= 0) {
1398                 /* Now send the uid/gid list. This was introduced in
1399                  * protocol version 15 */
1400                 recv_uid_list(f, flist);
1401
1402                 /* Recv the io_error flag */
1403                 if (lp_ignore_errors(module_id) || ignore_errors)
1404                         read_int(f);
1405                 else
1406                         io_error |= read_int(f);
1407         }
1408
1409         if (verbose > 3)
1410                 output_flist(flist);
1411
1412         if (list_only) {
1413                 int i;
1414                 for (i = 0; i < flist->count; i++)
1415                         list_file_entry(flist->files[i]);
1416         }
1417
1418         if (verbose > 2)
1419                 rprintf(FINFO, "recv_file_list done\n");
1420
1421         stats.flist_size = stats.total_read - start_read;
1422         stats.num_files = flist->count;
1423
1424         return flist;
1425
1426   oom:
1427         out_of_memory("recv_file_list");
1428         return NULL;            /* not reached */
1429 }
1430
1431 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1432 {
1433         return f_name_cmp(*file1, *file2);
1434 }
1435
1436 /* Search for an identically-named item in the file list.  Note that the
1437  * items must agree in their directory-ness, or no match is returned. */
1438 int flist_find(struct file_list *flist, struct file_struct *f)
1439 {
1440         int low = flist->low, high = flist->high;
1441         int ret, mid, mid_up;
1442
1443         while (low <= high) {
1444                 mid = (low + high) / 2;
1445                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1446                 if (mid_up <= high)
1447                         ret = f_name_cmp(flist->files[mid_up], f);
1448                 else
1449                         ret = 1;
1450                 if (ret == 0) {
1451                         if (protocol_version < 29
1452                             && S_ISDIR(flist->files[mid_up]->mode)
1453                             != S_ISDIR(f->mode))
1454                                 return -1;
1455                         return mid_up;
1456                 }
1457                 if (ret > 0)
1458                         high = mid - 1;
1459                 else
1460                         low = mid_up + 1;
1461         }
1462         return -1;
1463 }
1464
1465 /*
1466  * Free up any resources a file_struct has allocated
1467  * and clear the file.
1468  */
1469 void clear_file(int i, struct file_list *flist)
1470 {
1471         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1472                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1473         memset(flist->files[i], 0, file_struct_len);
1474 }
1475
1476 /*
1477  * allocate a new file list
1478  */
1479 struct file_list *flist_new(int with_hlink, char *msg)
1480 {
1481         struct file_list *flist;
1482
1483         flist = new(struct file_list);
1484         if (!flist)
1485                 out_of_memory(msg);
1486
1487         memset(flist, 0, sizeof (struct file_list));
1488
1489         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1490             out_of_memory, POOL_INTERN)))
1491                 out_of_memory(msg);
1492
1493 #ifdef SUPPORT_HARD_LINKS
1494         if (with_hlink && preserve_hard_links) {
1495                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1496                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1497                         out_of_memory(msg);
1498         }
1499 #endif
1500
1501         return flist;
1502 }
1503
1504 /*
1505  * free up all elements in a flist
1506  */
1507 void flist_free(struct file_list *flist)
1508 {
1509         pool_destroy(flist->file_pool);
1510         pool_destroy(flist->hlink_pool);
1511         free(flist->files);
1512         free(flist);
1513 }
1514
1515 /*
1516  * This routine ensures we don't have any duplicate names in our file list.
1517  * duplicate names can cause corruption because of the pipelining
1518  */
1519 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1520 {
1521         int i, prev_i = 0;
1522
1523         if (!flist)
1524                 return;
1525         if (flist->count == 0) {
1526                 flist->high = -1;
1527                 return;
1528         }
1529
1530         qsort(flist->files, flist->count,
1531             sizeof flist->files[0], (int (*)())file_compare);
1532
1533         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1534                 if (flist->files[i]->basename) {
1535                         prev_i = i;
1536                         break;
1537                 }
1538         }
1539         flist->low = prev_i;
1540         while (++i < flist->count) {
1541                 int j;
1542                 struct file_struct *file = flist->files[i];
1543
1544                 if (!file->basename)
1545                         continue;
1546                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1547                         j = prev_i;
1548                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1549                         int save_mode = file->mode;
1550                         /* Make sure that this directory doesn't duplicate a
1551                          * non-directory earlier in the list. */
1552                         flist->high = prev_i;
1553                         file->mode = S_IFREG;
1554                         j = flist_find(flist, file);
1555                         file->mode = save_mode;
1556                 } else
1557                         j = -1;
1558                 if (j >= 0) {
1559                         struct file_struct *fp = flist->files[j];
1560                         int keep, drop;
1561                         /* If one is a dir and the other is not, we want to
1562                          * keep the dir because it might have contents in the
1563                          * list. */
1564                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1565                                 if (S_ISDIR(file->mode))
1566                                         keep = i, drop = j;
1567                                 else
1568                                         keep = j, drop = i;
1569                         } else
1570                                 keep = j, drop = i;
1571                         if (verbose > 1 && !am_server) {
1572                                 rprintf(FINFO,
1573                                         "removing duplicate name %s from file list (%d)\n",
1574                                         f_name(file, NULL), drop);
1575                         }
1576                         /* Make sure that if we unduplicate '.', that we don't
1577                          * lose track of a user-specified top directory. */
1578                         flist->files[keep]->flags |= flist->files[drop]->flags
1579                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1580
1581                         clear_file(drop, flist);
1582
1583                         if (keep == i) {
1584                                 if (flist->low == drop) {
1585                                         for (j = drop + 1;
1586                                              j < i && !flist->files[j]->basename;
1587                                              j++) {}
1588                                         flist->low = j;
1589                                 }
1590                                 prev_i = i;
1591                         }
1592                 } else
1593                         prev_i = i;
1594         }
1595         flist->high = no_dups ? prev_i : flist->count - 1;
1596
1597         if (strip_root) {
1598                 /* We need to strip off the leading slashes for relative
1599                  * paths, but this must be done _after_ the sorting phase. */
1600                 for (i = flist->low; i <= flist->high; i++) {
1601                         struct file_struct *file = flist->files[i];
1602
1603                         if (!file->dirname)
1604                                 continue;
1605                         if (*file->dirname == '/') {
1606                                 char *s = file->dirname + 1;
1607                                 while (*s == '/') s++;
1608                                 memmove(file->dirname, s, strlen(s) + 1);
1609                         }
1610
1611                         if (!*file->dirname)
1612                                 file->dirname = NULL;
1613                 }
1614         }
1615 }
1616
1617 static void output_flist(struct file_list *flist)
1618 {
1619         char uidbuf[16], gidbuf[16], depthbuf[16];
1620         struct file_struct *file;
1621         const char *who = who_am_i();
1622         int i;
1623
1624         for (i = 0; i < flist->count; i++) {
1625                 file = flist->files[i];
1626                 if ((am_root || am_sender) && preserve_uid)
1627                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1628                 else
1629                         *uidbuf = '\0';
1630                 if (preserve_gid && file->gid != GID_NONE)
1631                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1632                 else
1633                         *gidbuf = '\0';
1634                 if (!am_sender)
1635                         sprintf(depthbuf, "%d", file->dir.depth);
1636                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1637                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1638                         file->dirname ? file->dirname : "",
1639                         file->dirname ? "/" : "", NS(file->basename),
1640                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1641                         (double)file->length, uidbuf, gidbuf, file->flags);
1642         }
1643 }
1644
1645 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1646 enum fnc_type { t_PATH, t_ITEM };
1647
1648 /* Compare the names of two file_struct entities, similar to how strcmp()
1649  * would do if it were operating on the joined strings.
1650  *
1651  * Some differences beginning with protocol_version 29: (1) directory names
1652  * are compared with an assumed trailing slash so that they compare in a
1653  * way that would cause them to sort immediately prior to any content they
1654  * may have; (2) a directory of any name compares after a non-directory of
1655  * any name at the same depth; (3) a directory with name "." compares prior
1656  * to anything else.  These changes mean that a directory and a non-dir
1657  * with the same name will not compare as equal (protocol_version >= 29).
1658  *
1659  * The dirname component can be an empty string, but the basename component
1660  * cannot (and never is in the current codebase).  The basename component
1661  * may be NULL (for a removed item), in which case it is considered to be
1662  * after any existing item. */
1663 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1664 {
1665         int dif;
1666         const uchar *c1, *c2;
1667         enum fnc_state state1, state2;
1668         enum fnc_type type1, type2;
1669         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1670
1671         if (!f1 || !f1->basename) {
1672                 if (!f2 || !f2->basename)
1673                         return 0;
1674                 return -1;
1675         }
1676         if (!f2 || !f2->basename)
1677                 return 1;
1678
1679         c1 = (uchar*)f1->dirname;
1680         c2 = (uchar*)f2->dirname;
1681         if (c1 == c2)
1682                 c1 = c2 = NULL;
1683         if (!c1) {
1684                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1685                 c1 = (uchar*)f1->basename;
1686                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1687                         type1 = t_ITEM;
1688                         state1 = s_TRAILING;
1689                         c1 = (uchar*)"";
1690                 } else
1691                         state1 = s_BASE;
1692         } else if (!*c1) {
1693                 type1 = t_path;
1694                 state1 = s_SLASH;
1695                 c1 = (uchar*)"/";
1696         } else {
1697                 type1 = t_path;
1698                 state1 = s_DIR;
1699         }
1700         if (!c2) {
1701                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1702                 c2 = (uchar*)f2->basename;
1703                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1704                         type2 = t_ITEM;
1705                         state2 = s_TRAILING;
1706                         c2 = (uchar*)"";
1707                 } else
1708                         state2 = s_BASE;
1709         } else if (!*c2) {
1710                 type2 = t_path;
1711                 state2 = s_SLASH;
1712                 c2 = (uchar*)"/";
1713         } else {
1714                 type2 = t_path;
1715                 state2 = s_DIR;
1716         }
1717
1718         if (type1 != type2)
1719                 return type1 == t_PATH ? 1 : -1;
1720
1721         while (1) {
1722                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1723                         break;
1724                 if (!*c1) {
1725                         switch (state1) {
1726                         case s_DIR:
1727                                 state1 = s_SLASH;
1728                                 c1 = (uchar*)"/";
1729                                 break;
1730                         case s_SLASH:
1731                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1732                                 c1 = (uchar*)f1->basename;
1733                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1734                                         type1 = t_ITEM;
1735                                         state1 = s_TRAILING;
1736                                         c1 = (uchar*)"";
1737                                 } else
1738                                         state1 = s_BASE;
1739                                 break;
1740                         case s_BASE:
1741                                 state1 = s_TRAILING;
1742                                 if (type1 == t_PATH) {
1743                                         c1 = (uchar*)"/";
1744                                         break;
1745                                 }
1746                                 /* FALL THROUGH */
1747                         case s_TRAILING:
1748                                 type1 = t_ITEM;
1749                                 break;
1750                         }
1751                         if (*c2 && type1 != type2)
1752                                 return type1 == t_PATH ? 1 : -1;
1753                 }
1754                 if (!*c2) {
1755                         switch (state2) {
1756                         case s_DIR:
1757                                 state2 = s_SLASH;
1758                                 c2 = (uchar*)"/";
1759                                 break;
1760                         case s_SLASH:
1761                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1762                                 c2 = (uchar*)f2->basename;
1763                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1764                                         type2 = t_ITEM;
1765                                         state2 = s_TRAILING;
1766                                         c2 = (uchar*)"";
1767                                 } else
1768                                         state2 = s_BASE;
1769                                 break;
1770                         case s_BASE:
1771                                 state2 = s_TRAILING;
1772                                 if (type2 == t_PATH) {
1773                                         c2 = (uchar*)"/";
1774                                         break;
1775                                 }
1776                                 /* FALL THROUGH */
1777                         case s_TRAILING:
1778                                 if (!*c1)
1779                                         return 0;
1780                                 type2 = t_ITEM;
1781                                 break;
1782                         }
1783                         if (type1 != type2)
1784                                 return type1 == t_PATH ? 1 : -1;
1785                 }
1786         }
1787
1788         return dif;
1789 }
1790
1791 /* Return a copy of the full filename of a flist entry, using the indicated
1792  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1793  * done because we checked the size when creating the file_struct entry.
1794  */
1795 char *f_name(struct file_struct *f, char *fbuf)
1796 {
1797         if (!f || !f->basename)
1798                 return NULL;
1799
1800         if (!fbuf) {
1801                 static char names[5][MAXPATHLEN];
1802                 static unsigned int n;
1803
1804                 n = (n + 1) % (sizeof names / sizeof names[0]);
1805
1806                 fbuf = names[n];
1807         }
1808
1809         if (f->dirname) {
1810                 int len = strlen(f->dirname);
1811                 memcpy(fbuf, f->dirname, len);
1812                 fbuf[len] = '/';
1813                 strcpy(fbuf + len + 1, f->basename);
1814         } else
1815                 strcpy(fbuf, f->basename);
1816
1817         return fbuf;
1818 }
1819
1820 /* Do a non-recursive scan of the named directory, possibly ignoring all
1821  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1822  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1823  * buffer (the functions we call will append names onto the end, but the old
1824  * dir value will be restored on exit). */
1825 struct file_list *get_dirlist(char *dirname, int dlen,
1826                               int ignore_filter_rules)
1827 {
1828         struct file_list *dirlist;
1829         char dirbuf[MAXPATHLEN];
1830         int save_recurse = recurse;
1831
1832         if (dlen < 0) {
1833                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1834                 if (dlen >= MAXPATHLEN)
1835                         return NULL;
1836                 dirname = dirbuf;
1837         }
1838
1839         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1840
1841         recurse = 0;
1842         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1843         recurse = save_recurse;
1844         if (do_progress)
1845                 flist_count_offset += dirlist->count;
1846
1847         clean_flist(dirlist, 0, 0);
1848
1849         if (verbose > 3)
1850                 output_flist(dirlist);
1851
1852         return dirlist;
1853 }