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 list_only;
  32 extern int am_root;
  33 extern int am_server;
  34 extern int am_daemon;
  35 extern int am_sender;
  36 extern int do_progress;
  37 extern int always_checksum;
  38 extern int module_id;
  39 extern int ignore_errors;
  40 extern int numeric_ids;
  41 extern int recurse;
  42 extern int xfer_dirs;
  43 extern int filesfrom_fd;
  44 extern int one_file_system;
  45 extern int copy_dirlinks;
  46 extern int keep_dirlinks;
  47 extern int preserve_links;
  48 extern int preserve_hard_links;
  49 extern int preserve_devices;
  50 extern int preserve_specials;
  51 extern int preserve_uid;
  52 extern int preserve_gid;
  53 extern int relative_paths;
  54 extern int implied_dirs;
  55 extern int prune_empty_dirs;
  56 extern int copy_links;
  57 extern int copy_unsafe_links;
  58 extern int protocol_version;
  59 extern int sanitize_paths;
  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 permbuf[PERMSTRING_SIZE];
 132
 133         if (!f->basename) {
 134                 /* this can happen if duplicate names were removed */
 135                 return;
 136         }
 137
 138         permstring(permbuf, 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                         permbuf,
 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                         permbuf,
 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, copy_dirlinks) < 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         f_name(file, fname);
 337
 338         flags = file->flags & XMIT_TOP_DIR;
 339
 340         if (file->mode == mode)
 341                 flags |= XMIT_SAME_MODE;
 342         else
 343                 mode = file->mode;
 344         if ((preserve_devices && IS_DEVICE(mode))
 345          || (preserve_specials && IS_SPECIAL(mode))) {
 346                 if (protocol_version < 28) {
 347                         if (file->u.rdev == rdev)
 348                                 flags |= XMIT_SAME_RDEV_pre28;
 349                         else
 350                                 rdev = file->u.rdev;
 351                 } else {
 352                         rdev = file->u.rdev;
 353                         if ((uint32)major(rdev) == rdev_major)
 354                                 flags |= XMIT_SAME_RDEV_MAJOR;
 355                         else
 356                                 rdev_major = major(rdev);
 357                         if ((uint32)minor(rdev) <= 0xFFu)
 358                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 359                 }
 360         } else if (protocol_version < 28)
 361                 rdev = makedev(0, 0);
 362         if (file->uid == uid)
 363                 flags |= XMIT_SAME_UID;
 364         else
 365                 uid = file->uid;
 366         if (file->gid == gid)
 367                 flags |= XMIT_SAME_GID;
 368         else
 369                 gid = file->gid;
 370         if (file->modtime == modtime)
 371                 flags |= XMIT_SAME_TIME;
 372         else
 373                 modtime = file->modtime;
 374
 375 #ifdef SUPPORT_HARD_LINKS
 376         if (file->link_u.idev) {
 377                 if (file->F_DEV == dev) {
 378                         if (protocol_version >= 28)
 379                                 flags |= XMIT_SAME_DEV;
 380                 } else
 381                         dev = file->F_DEV;
 382                 flags |= XMIT_HAS_IDEV_DATA;
 383         }
 384 #endif
 385
 386         for (l1 = 0;
 387             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 388             l1++) {}
 389         l2 = strlen(fname+l1);
 390
 391         if (l1 > 0)
 392                 flags |= XMIT_SAME_NAME;
 393         if (l2 > 255)
 394                 flags |= XMIT_LONG_NAME;
 395
 396         /* We must make sure we don't send a zero flag byte or the
 397          * other end will terminate the flist transfer.  Note that
 398          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 399          * it's harmless way to add a bit to the first flag byte. */
 400         if (protocol_version >= 28) {
 401                 if (!flags && !S_ISDIR(mode))
 402                         flags |= XMIT_TOP_DIR;
 403                 if ((flags & 0xFF00) || !flags) {
 404                         flags |= XMIT_EXTENDED_FLAGS;
 405                         write_byte(f, flags);
 406                         write_byte(f, flags >> 8);
 407                 } else
 408                         write_byte(f, flags);
 409         } else {
 410                 if (!(flags & 0xFF))
 411                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 412                 write_byte(f, flags);
 413         }
 414         if (flags & XMIT_SAME_NAME)
 415                 write_byte(f, l1);
 416         if (flags & XMIT_LONG_NAME)
 417                 write_int(f, l2);
 418         else
 419                 write_byte(f, l2);
 420         write_buf(f, fname + l1, l2);
 421
 422         write_longint(f, file->length);
 423         if (!(flags & XMIT_SAME_TIME))
 424                 write_int(f, modtime);
 425         if (!(flags & XMIT_SAME_MODE))
 426                 write_int(f, to_wire_mode(mode));
 427         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 428                 if (!numeric_ids)
 429                         add_uid(uid);
 430                 write_int(f, uid);
 431         }
 432         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 433                 if (!numeric_ids)
 434                         add_gid(gid);
 435                 write_int(f, gid);
 436         }
 437         if ((preserve_devices && IS_DEVICE(mode))
 438          || (preserve_specials && IS_SPECIAL(mode))) {
 439                 if (protocol_version < 28) {
 440                         if (!(flags & XMIT_SAME_RDEV_pre28))
 441                                 write_int(f, (int)rdev);
 442                 } else {
 443                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 444                                 write_int(f, major(rdev));
 445                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 446                                 write_byte(f, minor(rdev));
 447                         else
 448                                 write_int(f, minor(rdev));
 449                 }
 450         }
 451
 452 #ifdef SUPPORT_LINKS
 453         if (preserve_links && S_ISLNK(mode)) {
 454                 int len = strlen(file->u.link);
 455                 write_int(f, len);
 456                 write_buf(f, file->u.link, len);
 457         }
 458 #endif
 459
 460 #ifdef SUPPORT_HARD_LINKS
 461         if (flags & XMIT_HAS_IDEV_DATA) {
 462                 if (protocol_version < 26) {
 463                         /* 32-bit dev_t and ino_t */
 464                         write_int(f, dev);
 465                         write_int(f, file->F_INODE);
 466                 } else {
 467                         /* 64-bit dev_t and ino_t */
 468                         if (!(flags & XMIT_SAME_DEV))
 469                                 write_longint(f, dev);
 470                         write_longint(f, file->F_INODE);
 471                 }
 472         }
 473 #endif
 474
 475         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 476                 char *sum;
 477                 if (S_ISREG(mode))
 478                         sum = file->u.sum;
 479                 else {
 480                         /* Prior to 28, we sent a useless set of nulls. */
 481                         sum = empty_sum;
 482                 }
 483                 write_buf(f, sum, checksum_len);
 484         }
 485
 486         strlcpy(lastname, fname, MAXPATHLEN);
 487 }
 488
 489 static struct file_struct *receive_file_entry(struct file_list *flist,
 490                                               unsigned short flags, int f)
 491 {
 492         static time_t modtime;
 493         static mode_t mode;
 494         static int64 dev;
 495         static dev_t rdev;
 496         static uint32 rdev_major;
 497         static uid_t uid;
 498         static gid_t gid;
 499         static char lastname[MAXPATHLEN], *lastdir;
 500         static int lastdir_depth, lastdir_len = -1;
 501         static unsigned int del_hier_name_len = 0;
 502         static int in_del_hier = 0;
 503         char thisname[MAXPATHLEN];
 504         unsigned int l1 = 0, l2 = 0;
 505         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 506         OFF_T file_length;
 507         char *basename, *dirname, *bp;
 508         struct file_struct *file;
 509
 510         if (!flist) {
 511                 modtime = 0, mode = 0;
 512                 dev = 0, rdev = makedev(0, 0);
 513                 rdev_major = 0;
 514                 uid = 0, gid = 0;
 515                 *lastname = '\0';
 516                 lastdir_len = -1;
 517                 in_del_hier = 0;
 518                 return NULL;
 519         }
 520
 521         if (flags & XMIT_SAME_NAME)
 522                 l1 = read_byte(f);
 523
 524         if (flags & XMIT_LONG_NAME)
 525                 l2 = read_int(f);
 526         else
 527                 l2 = read_byte(f);
 528
 529         if (l2 >= MAXPATHLEN - l1) {
 530                 rprintf(FERROR,
 531                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 532                         flags, l1, l2, lastname);
 533                 overflow_exit("receive_file_entry");
 534         }
 535
 536         strlcpy(thisname, lastname, l1 + 1);
 537         read_sbuf(f, &thisname[l1], l2);
 538         thisname[l1 + l2] = 0;
 539
 540         strlcpy(lastname, thisname, MAXPATHLEN);
 541
 542         clean_fname(thisname, 0);
 543
 544         if (sanitize_paths)
 545                 sanitize_path(thisname, thisname, "", 0);
 546
 547         if ((basename = strrchr(thisname, '/')) != NULL) {
 548                 dirname_len = ++basename - thisname; /* counts future '\0' */
 549                 if (lastdir_len == dirname_len - 1
 550                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 551                         dirname = lastdir;
 552                         dirname_len = 0; /* indicates no copy is needed */
 553                 } else
 554                         dirname = thisname;
 555         } else {
 556                 basename = thisname;
 557                 dirname = NULL;
 558                 dirname_len = 0;
 559         }
 560         basename_len = strlen(basename) + 1; /* count the '\0' */
 561
 562         file_length = read_longint(f);
 563         if (!(flags & XMIT_SAME_TIME))
 564                 modtime = (time_t)read_int(f);
 565         if (!(flags & XMIT_SAME_MODE))
 566                 mode = from_wire_mode(read_int(f));
 567
 568         if (chmod_modes && !S_ISLNK(mode))
 569                 mode = tweak_mode(mode, chmod_modes);
 570
 571         if (preserve_uid && !(flags & XMIT_SAME_UID))
 572                 uid = (uid_t)read_int(f);
 573         if (preserve_gid && !(flags & XMIT_SAME_GID))
 574                 gid = (gid_t)read_int(f);
 575
 576         if ((preserve_devices && IS_DEVICE(mode))
 577          || (preserve_specials && IS_SPECIAL(mode))) {
 578                 if (protocol_version < 28) {
 579                         if (!(flags & XMIT_SAME_RDEV_pre28))
 580                                 rdev = (dev_t)read_int(f);
 581                 } else {
 582                         uint32 rdev_minor;
 583                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 584                                 rdev_major = read_int(f);
 585                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 586                                 rdev_minor = read_byte(f);
 587                         else
 588                                 rdev_minor = read_int(f);
 589                         rdev = makedev(rdev_major, rdev_minor);
 590                 }
 591         } else if (protocol_version < 28)
 592                 rdev = makedev(0, 0);
 593
 594 #ifdef SUPPORT_LINKS
 595         if (preserve_links && S_ISLNK(mode)) {
 596                 linkname_len = read_int(f) + 1; /* count the '\0' */
 597                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 598                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 599                                 linkname_len - 1);
 600                         overflow_exit("receive_file_entry");
 601                 }
 602         }
 603         else
 604 #endif
 605                 linkname_len = 0;
 606
 607         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 608
 609         alloc_len = file_struct_len + dirname_len + basename_len
 610                   + linkname_len + sum_len;
 611         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 612
 613         file = (struct file_struct *)bp;
 614         memset(bp, 0, file_struct_len);
 615         bp += file_struct_len;
 616
 617         file->modtime = modtime;
 618         file->length = file_length;
 619         file->mode = mode;
 620         file->uid = uid;
 621         file->gid = gid;
 622
 623         if (dirname_len) {
 624                 file->dirname = lastdir = bp;
 625                 lastdir_len = dirname_len - 1;
 626                 memcpy(bp, dirname, dirname_len - 1);
 627                 bp += dirname_len;
 628                 bp[-1] = '\0';
 629                 lastdir_depth = count_dir_elements(lastdir);
 630                 file->dir.depth = lastdir_depth + 1;
 631         } else if (dirname) {
 632                 file->dirname = dirname; /* we're reusing lastname */
 633                 file->dir.depth = lastdir_depth + 1;
 634         } else
 635                 file->dir.depth = 1;
 636
 637         if (S_ISDIR(mode)) {
 638                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 639                         file->dir.depth--;
 640                 if (flags & XMIT_TOP_DIR) {
 641                         in_del_hier = recurse;
 642                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 643                         if (relative_paths && del_hier_name_len > 2
 644                             && lastname[del_hier_name_len-1] == '.'
 645                             && lastname[del_hier_name_len-2] == '/')
 646                                 del_hier_name_len -= 2;
 647                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 648                 } else if (in_del_hier) {
 649                         if (!relative_paths || !del_hier_name_len
 650                          || (l1 >= del_hier_name_len
 651                           && lastname[del_hier_name_len] == '/'))
 652                                 file->flags |= FLAG_DEL_HERE;
 653                         else
 654                                 in_del_hier = 0;
 655                 }
 656         }
 657
 658         file->basename = bp;
 659         memcpy(bp, basename, basename_len);
 660         bp += basename_len;
 661
 662         if ((preserve_devices && IS_DEVICE(mode))
 663          || (preserve_specials && IS_SPECIAL(mode)))
 664                 file->u.rdev = rdev;
 665
 666 #ifdef SUPPORT_LINKS
 667         if (linkname_len) {
 668                 file->u.link = bp;
 669                 read_sbuf(f, bp, linkname_len - 1);
 670                 if (sanitize_paths)
 671                         sanitize_path(bp, bp, "", lastdir_depth);
 672                 bp += linkname_len;
 673         }
 674 #endif
 675
 676 #ifdef SUPPORT_HARD_LINKS
 677         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 678                 flags |= XMIT_HAS_IDEV_DATA;
 679         if (flags & XMIT_HAS_IDEV_DATA) {
 680                 int64 inode;
 681                 if (protocol_version < 26) {
 682                         dev = read_int(f);
 683                         inode = read_int(f);
 684                 } else {
 685                         if (!(flags & XMIT_SAME_DEV))
 686                                 dev = read_longint(f);
 687                         inode = read_longint(f);
 688                 }
 689                 if (flist->hlink_pool) {
 690                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 691                             struct idev, 1, "inode_table");
 692                         file->F_INODE = inode;
 693                         file->F_DEV = dev;
 694                 }
 695         }
 696 #endif
 697
 698         if (always_checksum && (sum_len || protocol_version < 28)) {
 699                 char *sum;
 700                 if (sum_len) {
 701                         file->u.sum = sum = bp;
 702                         /*bp += sum_len;*/
 703                 } else {
 704                         /* Prior to 28, we get a useless set of nulls. */
 705                         sum = empty_sum;
 706                 }
 707                 read_buf(f, sum, checksum_len);
 708         }
 709
 710         return file;
 711 }
 712
 713 /**
 714  * Create a file_struct for a named file by reading its stat()
 715  * information and performing extensive checks against global
 716  * options.
 717  *
 718  * @return the new file, or NULL if there was an error or this file
 719  * should be excluded.
 720  *
 721  * @todo There is a small optimization opportunity here to avoid
 722  * stat()ing the file in some circumstances, which has a certain cost.
 723  * We are called immediately after doing readdir(), and so we may
 724  * already know the d_type of the file.  We could for example avoid
 725  * statting directories if we're not recursing, but this is not a very
 726  * important case.  Some systems may not have d_type.
 727  **/
 728 struct file_struct *make_file(char *fname, struct file_list *flist,
 729                               STRUCT_STAT *stp, unsigned short flags,
 730                               int filter_level)
 731 {
 732         static char *lastdir;
 733         static int lastdir_len = -1;
 734         struct file_struct *file;
 735         STRUCT_STAT st;
 736         char sum[SUM_LENGTH];
 737         char thisname[MAXPATHLEN];
 738         char linkname[MAXPATHLEN];
 739         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 740         char *basename, *dirname, *bp;
 741
 742         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 743                 lastdir_len = -1;
 744
 745         if (strlcpy(thisname, fname, sizeof thisname)
 746             >= sizeof thisname - flist_dir_len) {
 747                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 748                 return NULL;
 749         }
 750         clean_fname(thisname, 0);
 751         if (sanitize_paths)
 752                 sanitize_path(thisname, thisname, "", 0);
 753
 754         memset(sum, 0, SUM_LENGTH);
 755
 756         if (stp && S_ISDIR(stp->st_mode))
 757                 st = *stp; /* Needed for "symlink/." with --relative. */
 758         else if (readlink_stat(thisname, &st, linkname) != 0) {
 759                 int save_errno = errno;
 760                 /* See if file is excluded before reporting an error. */
 761                 if (filter_level != NO_FILTERS
 762                     && is_excluded(thisname, 0, filter_level))
 763                         return NULL;
 764                 if (save_errno == ENOENT) {
 765 #ifdef SUPPORT_LINKS
 766                         /* Avoid "vanished" error if symlink points nowhere. */
 767                         if (copy_links && do_lstat(thisname, &st) == 0
 768                             && S_ISLNK(st.st_mode)) {
 769                                 io_error |= IOERR_GENERAL;
 770                                 rprintf(FERROR, "symlink has no referent: %s\n",
 771                                         full_fname(thisname));
 772                         } else
 773 #endif
 774                         {
 775                                 enum logcode c = am_daemon && protocol_version < 28
 776                                     ? FERROR : FINFO;
 777                                 io_error |= IOERR_VANISHED;
 778                                 rprintf(c, "file has vanished: %s\n",
 779                                         full_fname(thisname));
 780                         }
 781                 } else {
 782                         io_error |= IOERR_GENERAL;
 783                         rsyserr(FERROR, save_errno, "readlink %s failed",
 784                                 full_fname(thisname));
 785                 }
 786                 return NULL;
 787         }
 788
 789         /* backup.c calls us with filter_level set to NO_FILTERS. */
 790         if (filter_level == NO_FILTERS)
 791                 goto skip_filters;
 792
 793         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 794                 rprintf(FINFO, "skipping directory %s\n", thisname);
 795                 return NULL;
 796         }
 797
 798         /* We only care about directories because we need to avoid recursing
 799          * into a mount-point directory, not to avoid copying a symlinked
 800          * file if -L (or similar) was specified. */
 801         if (one_file_system && st.st_dev != filesystem_dev
 802          && S_ISDIR(st.st_mode)) {
 803                 if (one_file_system > 1) {
 804                         if (verbose > 2) {
 805                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 806                                         thisname);
 807                         }
 808                         return NULL;
 809                 }
 810                 flags |= FLAG_MOUNT_POINT;
 811         }
 812
 813         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 814                 return NULL;
 815
 816         if (lp_ignore_nonreadable(module_id)) {
 817 #ifdef SUPPORT_LINKS
 818                 if (!S_ISLNK(st.st_mode))
 819 #endif
 820                         if (access(thisname, R_OK) != 0)
 821                                 return NULL;
 822         }
 823
 824   skip_filters:
 825
 826         if (verbose > 2) {
 827                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 828                         who_am_i(), thisname, filter_level);
 829         }
 830
 831         if ((basename = strrchr(thisname, '/')) != NULL) {
 832                 dirname_len = ++basename - thisname; /* counts future '\0' */
 833                 if (lastdir_len == dirname_len - 1
 834                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 835                         dirname = lastdir;
 836                         dirname_len = 0; /* indicates no copy is needed */
 837                 } else
 838                         dirname = thisname;
 839         } else {
 840                 basename = thisname;
 841                 dirname = NULL;
 842                 dirname_len = 0;
 843         }
 844         basename_len = strlen(basename) + 1; /* count the '\0' */
 845
 846 #ifdef SUPPORT_LINKS
 847         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 848 #else
 849         linkname_len = 0;
 850 #endif
 851
 852         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 853                 ? MD4_SUM_LENGTH : 0;
 854
 855         alloc_len = file_struct_len + dirname_len + basename_len
 856             + linkname_len + sum_len;
 857         if (flist)
 858                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 859         else {
 860                 if (!(bp = new_array(char, alloc_len)))
 861                         out_of_memory("make_file");
 862         }
 863
 864         file = (struct file_struct *)bp;
 865         memset(bp, 0, file_struct_len);
 866         bp += file_struct_len;
 867
 868         file->flags = flags;
 869         file->modtime = st.st_mtime;
 870         file->length = st.st_size;
 871         file->mode = st.st_mode;
 872         file->uid = st.st_uid;
 873         file->gid = st.st_gid;
 874
 875 #ifdef SUPPORT_HARD_LINKS
 876         if (flist && flist->hlink_pool) {
 877                 if (protocol_version < 28) {
 878                         if (S_ISREG(st.st_mode))
 879                                 file->link_u.idev = pool_talloc(
 880                                     flist->hlink_pool, struct idev, 1,
 881                                     "inode_table");
 882                 } else {
 883                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 884                                 file->link_u.idev = pool_talloc(
 885                                     flist->hlink_pool, struct idev, 1,
 886                                     "inode_table");
 887                 }
 888         }
 889         if (file->link_u.idev) {
 890                 file->F_DEV = st.st_dev;
 891                 file->F_INODE = st.st_ino;
 892         }
 893 #endif
 894
 895         if (dirname_len) {
 896                 file->dirname = lastdir = bp;
 897                 lastdir_len = dirname_len - 1;
 898                 memcpy(bp, dirname, dirname_len - 1);
 899                 bp += dirname_len;
 900                 bp[-1] = '\0';
 901         } else if (dirname)
 902                 file->dirname = dirname;
 903
 904         file->basename = bp;
 905         memcpy(bp, basename, basename_len);
 906         bp += basename_len;
 907
 908 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 909         if ((preserve_devices && IS_DEVICE(st.st_mode))
 910          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 911                 file->u.rdev = st.st_rdev;
 912 #endif
 913
 914 #ifdef SUPPORT_LINKS
 915         if (linkname_len) {
 916                 file->u.link = bp;
 917                 memcpy(bp, linkname, linkname_len);
 918                 bp += linkname_len;
 919         }
 920 #endif
 921
 922         if (sum_len) {
 923                 file->u.sum = bp;
 924                 file_checksum(thisname, bp, st.st_size);
 925                 /*bp += sum_len;*/
 926         }
 927
 928         file->dir.root = flist_dir;
 929
 930         /* This code is only used by the receiver when it is building
 931          * a list of files for a delete pass. */
 932         if (keep_dirlinks && linkname_len && flist) {
 933                 STRUCT_STAT st2;
 934                 int save_mode = file->mode;
 935                 file->mode = S_IFDIR; /* Find a directory with our name. */
 936                 if (flist_find(the_file_list, file) >= 0
 937                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 938                         file->modtime = st2.st_mtime;
 939                         file->length = st2.st_size;
 940                         file->mode = st2.st_mode;
 941                         file->uid = st2.st_uid;
 942                         file->gid = st2.st_gid;
 943                         file->u.link = NULL;
 944                 } else
 945                         file->mode = save_mode;
 946         }
 947
 948         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 949                 stats.total_size += st.st_size;
 950
 951         return file;
 952 }
 953
 954 static struct file_struct *send_file_name(int f, struct file_list *flist,
 955                                           char *fname, STRUCT_STAT *stp,
 956                                           unsigned short flags)
 957 {
 958         struct file_struct *file;
 959
 960         file = make_file(fname, flist, stp, flags,
 961                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 962         if (!file)
 963                 return NULL;
 964
 965         if (chmod_modes && !S_ISLNK(file->mode))
 966                 file->mode = tweak_mode(file->mode, chmod_modes);
 967
 968         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 969
 970         flist_expand(flist);
 971
 972         if (file->basename[0]) {
 973                 flist->files[flist->count++] = file;
 974                 send_file_entry(file, f);
 975         }
 976         return file;
 977 }
 978
 979 static void send_if_directory(int f, struct file_list *flist,
 980                               struct file_struct *file,
 981                               char *fbuf, unsigned int ol)
 982 {
 983         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 984
 985         if (S_ISDIR(file->mode)
 986             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 987                 void *save_filters;
 988                 unsigned int len = strlen(fbuf);
 989                 if (len > 1 && fbuf[len-1] == '/')
 990                         fbuf[--len] = '\0';
 991                 if (len >= MAXPATHLEN - 1) {
 992                         io_error |= IOERR_GENERAL;
 993                         rprintf(FERROR, "skipping long-named directory: %s\n",
 994                                 full_fname(fbuf));
 995                         return;
 996                 }
 997                 save_filters = push_local_filters(fbuf, len);
 998                 send_directory(f, flist, fbuf, len);
 999                 pop_local_filters(save_filters);
1000                 fbuf[ol] = '\0';
1001                 if (is_dot_dir)
1002                         fbuf[ol-1] = '.';
1003         }
1004 }
1005
1006 /* This function is normally called by the sender, but the receiving side also
1007  * calls it from get_dirlist() with f set to -1 so that we just construct the
1008  * file list in memory without sending it over the wire.  Also, get_dirlist()
1009  * might call this with f set to -2, which also indicates that local filter
1010  * rules should be ignored. */
1011 static void send_directory(int f, struct file_list *flist,
1012                            char *fbuf, int len)
1013 {
1014         struct dirent *di;
1015         unsigned remainder;
1016         char *p;
1017         DIR *d;
1018         int start = flist->count;
1019
1020         if (!(d = opendir(fbuf))) {
1021                 io_error |= IOERR_GENERAL;
1022                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1023                 return;
1024         }
1025
1026         p = fbuf + len;
1027         if (len != 1 || *fbuf != '/')
1028                 *p++ = '/';
1029         *p = '\0';
1030         remainder = MAXPATHLEN - (p - fbuf);
1031
1032         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1033                 char *dname = d_name(di);
1034                 if (dname[0] == '.' && (dname[1] == '\0'
1035                     || (dname[1] == '.' && dname[2] == '\0')))
1036                         continue;
1037                 if (strlcpy(p, dname, remainder) >= remainder) {
1038                         io_error |= IOERR_GENERAL;
1039                         rprintf(FINFO,
1040                                 "cannot send long-named file %s\n",
1041                                 full_fname(fbuf));
1042                         continue;
1043                 }
1044
1045                 send_file_name(f, flist, fbuf, NULL, 0);
1046         }
1047
1048         fbuf[len] = '\0';
1049
1050         if (errno) {
1051                 io_error |= IOERR_GENERAL;
1052                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1053         }
1054
1055         closedir(d);
1056
1057         if (recurse) {
1058                 int i, end = flist->count - 1;
1059                 for (i = start; i <= end; i++)
1060                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1061         }
1062 }
1063
1064 struct file_list *send_file_list(int f, int argc, char *argv[])
1065 {
1066         int len;
1067         STRUCT_STAT st;
1068         char *p, *dir, olddir[sizeof curr_dir];
1069         char lastpath[MAXPATHLEN] = "";
1070         struct file_list *flist;
1071         struct timeval start_tv, end_tv;
1072         int64 start_write;
1073         int use_ff_fd = 0;
1074
1075         if (show_filelist_p())
1076                 start_filelist_progress("building file list");
1077
1078         start_write = stats.total_written;
1079         gettimeofday(&start_tv, NULL);
1080
1081         flist = flist_new(WITH_HLINK, "send_file_list");
1082
1083         io_start_buffering_out();
1084         if (filesfrom_fd >= 0) {
1085                 if (argv[0] && !push_dir(argv[0])) {
1086                         rsyserr(FERROR, errno, "push_dir %s failed",
1087                                 full_fname(argv[0]));
1088                         exit_cleanup(RERR_FILESELECT);
1089                 }
1090                 use_ff_fd = 1;
1091         }
1092
1093         while (1) {
1094                 char fbuf[MAXPATHLEN];
1095                 char *fn;
1096                 int is_dot_dir;
1097
1098                 if (use_ff_fd) {
1099                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1100                                 break;
1101                         sanitize_path(fbuf, fbuf, "", 0);
1102                 } else {
1103                         if (argc-- == 0)
1104                                 break;
1105                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1106                         if (sanitize_paths)
1107                                 sanitize_path(fbuf, fbuf, "", 0);
1108                 }
1109
1110                 len = strlen(fbuf);
1111                 if (relative_paths) {
1112                         /* We clean up fbuf below. */
1113                         is_dot_dir = 0;
1114                 } else if (!len || fbuf[len - 1] == '/') {
1115                         if (len == 2 && fbuf[0] == '.') {
1116                                 /* Turn "./" into just "." rather than "./." */
1117                                 fbuf[1] = '\0';
1118                         } else {
1119                                 if (len + 1 >= MAXPATHLEN)
1120                                         overflow_exit("send_file_list");
1121                                 fbuf[len++] = '.';
1122                                 fbuf[len] = '\0';
1123                         }
1124                         is_dot_dir = 1;
1125                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1126                     && (len == 2 || fbuf[len-3] == '/')) {
1127                         if (len + 2 >= MAXPATHLEN)
1128                                 overflow_exit("send_file_list");
1129                         fbuf[len++] = '/';
1130                         fbuf[len++] = '.';
1131                         fbuf[len] = '\0';
1132                         is_dot_dir = 1;
1133                 } else {
1134                         is_dot_dir = fbuf[len-1] == '.'
1135                                    && (len == 1 || fbuf[len-2] == '/');
1136                 }
1137
1138                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1139                         io_error |= IOERR_GENERAL;
1140                         rsyserr(FERROR, errno, "link_stat %s failed",
1141                                 full_fname(fbuf));
1142                         continue;
1143                 }
1144
1145                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1146                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1147                         continue;
1148                 }
1149
1150                 dir = NULL;
1151                 olddir[0] = '\0';
1152
1153                 if (!relative_paths) {
1154                         p = strrchr(fbuf, '/');
1155                         if (p) {
1156                                 *p = '\0';
1157                                 if (p == fbuf)
1158                                         dir = "/";
1159                                 else
1160                                         dir = fbuf;
1161                                 len -= p - fbuf + 1;
1162                                 fn = p + 1;
1163                         } else
1164                                 fn = fbuf;
1165                 } else {
1166                         if ((p = strstr(fbuf, "/./")) != NULL) {
1167                                 *p = '\0';
1168                                 if (p == fbuf)
1169                                         dir = "/";
1170                                 else
1171                                         dir = fbuf;
1172                                 len -= p - fbuf + 3;
1173                                 fn = p + 3;
1174                         } else
1175                                 fn = fbuf;
1176                         /* Get rid of trailing "/" and "/.". */
1177                         while (len) {
1178                                 if (fn[len - 1] == '/') {
1179                                         is_dot_dir = 1;
1180                                         if (!--len && !dir) {
1181                                                 len++;
1182                                                 break;
1183                                         }
1184                                 }
1185                                 else if (len >= 2 && fn[len - 1] == '.'
1186                                                   && fn[len - 2] == '/') {
1187                                         is_dot_dir = 1;
1188                                         if (!(len -= 2) && !dir) {
1189                                                 len++;
1190                                                 break;
1191                                         }
1192                                 } else
1193                                         break;
1194                         }
1195                         fn[len] = '\0';
1196                         /* Reject a ".." dir in the active part of the path. */
1197                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1198                                 if ((p[2] == '/' || p[2] == '\0')
1199                                  && (p == fn || p[-1] == '/')) {
1200                                         rprintf(FERROR,
1201                                             "found \"..\" dir in relative path: %s\n",
1202                                             fbuf);
1203                                         exit_cleanup(RERR_SYNTAX);
1204                                 }
1205                         }
1206                 }
1207
1208                 if (!*fn) {
1209                         len = 1;
1210                         fn = ".";
1211                 }
1212
1213                 if (dir && *dir) {
1214                         static char *lastdir;
1215                         static int lastdir_len;
1216
1217                         strlcpy(olddir, curr_dir, sizeof olddir);
1218
1219                         if (!push_dir(dir)) {
1220                                 io_error |= IOERR_GENERAL;
1221                                 rsyserr(FERROR, errno, "push_dir %s failed",
1222                                         full_fname(dir));
1223                                 continue;
1224                         }
1225
1226                         if (lastdir && strcmp(lastdir, dir) == 0) {
1227                                 flist_dir = lastdir;
1228                                 flist_dir_len = lastdir_len;
1229                         } else {
1230                                 flist_dir = lastdir = strdup(dir);
1231                                 flist_dir_len = lastdir_len = strlen(dir);
1232                         }
1233                 }
1234
1235                 if (fn != fbuf)
1236                         memmove(fbuf, fn, len + 1);
1237
1238                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1239                         /* Send the implied directories at the start of the
1240                          * source spec, so we get their permissions right. */
1241                         char *lp = lastpath, *slash = fbuf;
1242                         *p = '\0';
1243                         /* Skip any initial directories in our path that we
1244                          * have in common with lastpath. */
1245                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1246                                 if (*fn == '/')
1247                                         slash = fn;
1248                         }
1249                         *p = '/';
1250                         if (fn != p || (*lp && *lp != '/')) {
1251                                 int save_copy_links = copy_links;
1252                                 int save_xfer_dirs = xfer_dirs;
1253                                 copy_links |= copy_unsafe_links;
1254                                 xfer_dirs = 1;
1255                                 while ((slash = strchr(slash+1, '/')) != 0) {
1256                                         *slash = '\0';
1257                                         send_file_name(f, flist, fbuf, NULL, 0);
1258                                         *slash = '/';
1259                                 }
1260                                 copy_links = save_copy_links;
1261                                 xfer_dirs = save_xfer_dirs;
1262                                 *p = '\0';
1263                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1264                                 *p = '/';
1265                         }
1266                 }
1267
1268                 if (one_file_system)
1269                         filesystem_dev = st.st_dev;
1270
1271                 if (recurse || (xfer_dirs && is_dot_dir)) {
1272                         struct file_struct *file;
1273                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1274                         if (file)
1275                                 send_if_directory(f, flist, file, fbuf, len);
1276                 } else
1277                         send_file_name(f, flist, fbuf, &st, 0);
1278
1279                 if (olddir[0]) {
1280                         flist_dir = NULL;
1281                         flist_dir_len = 0;
1282                         if (!pop_dir(olddir)) {
1283                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1284                                         full_fname(olddir));
1285                                 exit_cleanup(RERR_FILESELECT);
1286                         }
1287                 }
1288         }
1289
1290         gettimeofday(&end_tv, NULL);
1291         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1292                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1293         if (stats.flist_buildtime == 0)
1294                 stats.flist_buildtime = 1;
1295         start_tv = end_tv;
1296
1297         send_file_entry(NULL, f);
1298
1299         if (show_filelist_p())
1300                 finish_filelist_progress(flist);
1301
1302         gettimeofday(&end_tv, NULL);
1303         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1304                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1305
1306         if (flist->hlink_pool) {
1307                 pool_destroy(flist->hlink_pool);
1308                 flist->hlink_pool = NULL;
1309         }
1310
1311         /* Sort the list without removing any duplicates.  This allows the
1312          * receiving side to ask for any name they like, which gives us the
1313          * flexibility to change the way we unduplicate names in the future
1314          * without causing a compatibility problem with older versions. */
1315         clean_flist(flist, 0, 0);
1316
1317         send_uid_list(f);
1318
1319         /* send the io_error flag */
1320         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1321
1322         io_end_buffering();
1323         stats.flist_size = stats.total_written - start_write;
1324         stats.num_files = flist->count;
1325
1326         if (verbose > 3)
1327                 output_flist(flist);
1328
1329         if (verbose > 2)
1330                 rprintf(FINFO, "send_file_list done\n");
1331
1332         return flist;
1333 }
1334
1335 struct file_list *recv_file_list(int f)
1336 {
1337         struct file_list *flist;
1338         unsigned short flags;
1339         int64 start_read;
1340
1341         if (show_filelist_p())
1342                 start_filelist_progress("receiving file list");
1343
1344         start_read = stats.total_read;
1345
1346         flist = flist_new(WITH_HLINK, "recv_file_list");
1347
1348         flist->count = 0;
1349         flist->malloced = 1000;
1350         flist->files = new_array(struct file_struct *, flist->malloced);
1351         if (!flist->files)
1352                 goto oom;
1353
1354         while ((flags = read_byte(f)) != 0) {
1355                 struct file_struct *file;
1356
1357                 flist_expand(flist);
1358
1359                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1360                         flags |= read_byte(f) << 8;
1361                 file = receive_file_entry(flist, flags, f);
1362
1363                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1364                         stats.total_size += file->length;
1365
1366                 flist->files[flist->count++] = file;
1367
1368                 maybe_emit_filelist_progress(flist->count);
1369
1370                 if (verbose > 2) {
1371                         rprintf(FINFO, "recv_file_name(%s)\n",
1372                                 f_name(file, NULL));
1373                 }
1374         }
1375         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1376
1377         if (verbose > 2)
1378                 rprintf(FINFO, "received %d names\n", flist->count);
1379
1380         if (show_filelist_p())
1381                 finish_filelist_progress(flist);
1382
1383         clean_flist(flist, relative_paths, 1);
1384
1385         if (f >= 0) {
1386                 recv_uid_list(f, flist);
1387
1388                 /* Recv the io_error flag */
1389                 if (lp_ignore_errors(module_id) || ignore_errors)
1390                         read_int(f);
1391                 else
1392                         io_error |= read_int(f);
1393         }
1394
1395         if (verbose > 3)
1396                 output_flist(flist);
1397
1398         if (list_only) {
1399                 int i;
1400                 for (i = 0; i < flist->count; i++)
1401                         list_file_entry(flist->files[i]);
1402         }
1403
1404         if (verbose > 2)
1405                 rprintf(FINFO, "recv_file_list done\n");
1406
1407         stats.flist_size = stats.total_read - start_read;
1408         stats.num_files = flist->count;
1409
1410         return flist;
1411
1412   oom:
1413         out_of_memory("recv_file_list");
1414         return NULL;            /* not reached */
1415 }
1416
1417 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1418 {
1419         return f_name_cmp(*file1, *file2);
1420 }
1421
1422 /* Search for an identically-named item in the file list.  Note that the
1423  * items must agree in their directory-ness, or no match is returned. */
1424 int flist_find(struct file_list *flist, struct file_struct *f)
1425 {
1426         int low = flist->low, high = flist->high;
1427         int diff, mid, mid_up;
1428
1429         while (low <= high) {
1430                 mid = (low + high) / 2;
1431                 if (flist->files[mid]->basename)
1432                         mid_up = mid;
1433                 else {
1434                         /* Scan for the next non-empty entry using the cached
1435                          * distance values.  If the value isn't fully up-to-
1436                          * date, update it. */
1437                         mid_up = mid + flist->files[mid]->dir.depth;
1438                         if (!flist->files[mid_up]->basename) {
1439                                 do {
1440                                     mid_up += flist->files[mid_up]->dir.depth;
1441                                 } while (!flist->files[mid_up]->basename);
1442                                 flist->files[mid]->dir.depth = mid_up - mid;
1443                         }
1444                         if (mid_up > high) {
1445                                 /* If there's nothing left above us, set high to
1446                                  * a non-empty entry below us and continue. */
1447                                 high = mid - flist->files[mid]->length;
1448                                 if (!flist->files[high]->basename) {
1449                                         do {
1450                                             high -= flist->files[high]->length;
1451                                         } while (!flist->files[high]->basename);
1452                                         flist->files[mid]->length = mid - high;
1453                                 }
1454                                 continue;
1455                         }
1456                 }
1457                 diff = f_name_cmp(flist->files[mid_up], f);
1458                 if (diff == 0) {
1459                         if (protocol_version < 29
1460                             && S_ISDIR(flist->files[mid_up]->mode)
1461                             != S_ISDIR(f->mode))
1462                                 return -1;
1463                         return mid_up;
1464                 }
1465                 if (diff < 0)
1466                         low = mid_up + 1;
1467                 else
1468                         high = mid - 1;
1469         }
1470         return -1;
1471 }
1472
1473 /*
1474  * Free up any resources a file_struct has allocated
1475  * and clear the file.
1476  */
1477 void clear_file(struct file_struct *file, struct file_list *flist)
1478 {
1479         if (flist->hlink_pool && file->link_u.idev)
1480                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1481         memset(file, 0, file_struct_len);
1482         /* In an empty entry, dir.depth is an offset to the next non-empty
1483          * entry.  Likewise for length in the opposite direction.  We assume
1484          * that we're alone for now since flist_find() will adjust the counts
1485          * it runs into that aren't up-to-date. */
1486         file->length = file->dir.depth = 1;
1487 }
1488
1489 /*
1490  * allocate a new file list
1491  */
1492 struct file_list *flist_new(int with_hlink, char *msg)
1493 {
1494         struct file_list *flist;
1495
1496         flist = new(struct file_list);
1497         if (!flist)
1498                 out_of_memory(msg);
1499
1500         memset(flist, 0, sizeof (struct file_list));
1501
1502         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1503             out_of_memory, POOL_INTERN)))
1504                 out_of_memory(msg);
1505
1506 #ifdef SUPPORT_HARD_LINKS
1507         if (with_hlink && preserve_hard_links) {
1508                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1509                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1510                         out_of_memory(msg);
1511         }
1512 #endif
1513
1514         return flist;
1515 }
1516
1517 /*
1518  * free up all elements in a flist
1519  */
1520 void flist_free(struct file_list *flist)
1521 {
1522         pool_destroy(flist->file_pool);
1523         pool_destroy(flist->hlink_pool);
1524         free(flist->files);
1525         free(flist);
1526 }
1527
1528 /*
1529  * This routine ensures we don't have any duplicate names in our file list.
1530  * duplicate names can cause corruption because of the pipelining
1531  */
1532 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1533 {
1534         char fbuf[MAXPATHLEN];
1535         int i, prev_i = 0;
1536
1537         if (!flist)
1538                 return;
1539         if (flist->count == 0) {
1540                 flist->high = -1;
1541                 return;
1542         }
1543
1544         qsort(flist->files, flist->count,
1545             sizeof flist->files[0], (int (*)())file_compare);
1546
1547         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1548                 if (flist->files[i]->basename) {
1549                         prev_i = i;
1550                         break;
1551                 }
1552         }
1553         flist->low = prev_i;
1554         while (++i < flist->count) {
1555                 int j;
1556                 struct file_struct *file = flist->files[i];
1557
1558                 if (!file->basename)
1559                         continue;
1560                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1561                         j = prev_i;
1562                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1563                         int save_mode = file->mode;
1564                         /* Make sure that this directory doesn't duplicate a
1565                          * non-directory earlier in the list. */
1566                         flist->high = prev_i;
1567                         file->mode = S_IFREG;
1568                         j = flist_find(flist, file);
1569                         file->mode = save_mode;
1570                 } else
1571                         j = -1;
1572                 if (j >= 0) {
1573                         struct file_struct *fp = flist->files[j];
1574                         int keep, drop;
1575                         /* If one is a dir and the other is not, we want to
1576                          * keep the dir because it might have contents in the
1577                          * list. */
1578                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1579                                 if (S_ISDIR(file->mode))
1580                                         keep = i, drop = j;
1581                                 else
1582                                         keep = j, drop = i;
1583                         } else
1584                                 keep = j, drop = i;
1585                         if (verbose > 1 && !am_server) {
1586                                 rprintf(FINFO,
1587                                         "removing duplicate name %s from file list (%d)\n",
1588                                         f_name(file, fbuf), drop);
1589                         }
1590                         /* Make sure we don't lose track of a user-specified
1591                          * top directory. */
1592                         flist->files[keep]->flags |= flist->files[drop]->flags
1593                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1594
1595                         clear_file(flist->files[drop], flist);
1596
1597                         if (keep == i) {
1598                                 if (flist->low == drop) {
1599                                         for (j = drop + 1;
1600                                              j < i && !flist->files[j]->basename;
1601                                              j++) {}
1602                                         flist->low = j;
1603                                 }
1604                                 prev_i = i;
1605                         }
1606                 } else
1607                         prev_i = i;
1608         }
1609         flist->high = no_dups ? prev_i : flist->count - 1;
1610
1611         if (strip_root) {
1612                 /* We need to strip off the leading slashes for relative
1613                  * paths, but this must be done _after_ the sorting phase. */
1614                 for (i = flist->low; i <= flist->high; i++) {
1615                         struct file_struct *file = flist->files[i];
1616
1617                         if (!file->dirname)
1618                                 continue;
1619                         while (*file->dirname == '/')
1620                                 file->dirname++;
1621                         if (!*file->dirname)
1622                                 file->dirname = NULL;
1623                 }
1624         }
1625
1626         if (prune_empty_dirs && no_dups) {
1627                 int j, prev_depth = 0;
1628
1629                 prev_i = 0; /* It's OK that this isn't really true. */
1630
1631                 for (i = flist->low; i <= flist->high; i++) {
1632                         struct file_struct *fp, *file = flist->files[i];
1633
1634                         /* This temporarily abuses the dir.depth value for a
1635                          * directory that is in a chain that might get pruned.
1636                          * We restore the old value if it gets a reprieve. */
1637                         if (S_ISDIR(file->mode) && file->dir.depth) {
1638                                 /* Dump empty dirs when coming back down. */
1639                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1640                                         fp = flist->files[prev_i];
1641                                         if (fp->dir.depth >= 0)
1642                                                 break;
1643                                         prev_i = -fp->dir.depth-1;
1644                                         clear_file(fp, flist);
1645                                 }
1646                                 prev_depth = file->dir.depth;
1647                                 if (is_excluded(f_name(file, fbuf), 1,
1648                                                        ALL_FILTERS)) {
1649                                         /* Keep dirs through this dir. */
1650                                         for (j = prev_depth-1; ; j--) {
1651                                                 fp = flist->files[prev_i];
1652                                                 if (fp->dir.depth >= 0)
1653                                                         break;
1654                                                 prev_i = -fp->dir.depth-1;
1655                                                 fp->dir.depth = j;
1656                                         }
1657                                 } else
1658                                         file->dir.depth = -prev_i-1;
1659                                 prev_i = i;
1660                         } else {
1661                                 /* Keep dirs through this non-dir. */
1662                                 for (j = prev_depth; ; j--) {
1663                                         fp = flist->files[prev_i];
1664                                         if (fp->dir.depth >= 0)
1665                                                 break;
1666                                         prev_i = -fp->dir.depth-1;
1667                                         fp->dir.depth = j;
1668                                 }
1669                         }
1670                 }
1671                 /* Dump empty all remaining empty dirs. */
1672                 while (1) {
1673                         struct file_struct *fp = flist->files[prev_i];
1674                         if (fp->dir.depth >= 0)
1675                                 break;
1676                         prev_i = -fp->dir.depth-1;
1677                         clear_file(fp, flist);
1678                 }
1679
1680                 for (i = flist->low; i <= flist->high; i++) {
1681                         if (flist->files[i]->basename)
1682                                 break;
1683                 }
1684                 flist->low = i;
1685                 for (i = flist->high; i >= flist->low; i--) {
1686                         if (flist->files[i]->basename)
1687                                 break;
1688                 }
1689                 flist->high = i;
1690         }
1691 }
1692
1693 static void output_flist(struct file_list *flist)
1694 {
1695         char uidbuf[16], gidbuf[16], depthbuf[16];
1696         struct file_struct *file;
1697         const char *who = who_am_i();
1698         int i;
1699
1700         for (i = 0; i < flist->count; i++) {
1701                 file = flist->files[i];
1702                 if ((am_root || am_sender) && preserve_uid)
1703                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1704                 else
1705                         *uidbuf = '\0';
1706                 if (preserve_gid && file->gid != GID_NONE)
1707                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1708                 else
1709                         *gidbuf = '\0';
1710                 if (!am_sender)
1711                         sprintf(depthbuf, "%d", file->dir.depth);
1712                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1713                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1714                         file->dirname ? file->dirname : "",
1715                         file->dirname ? "/" : "", NS(file->basename),
1716                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1717                         (double)file->length, uidbuf, gidbuf, file->flags);
1718         }
1719 }
1720
1721 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1722 enum fnc_type { t_PATH, t_ITEM };
1723
1724 /* Compare the names of two file_struct entities, similar to how strcmp()
1725  * would do if it were operating on the joined strings.
1726  *
1727  * Some differences beginning with protocol_version 29: (1) directory names
1728  * are compared with an assumed trailing slash so that they compare in a
1729  * way that would cause them to sort immediately prior to any content they
1730  * may have; (2) a directory of any name compares after a non-directory of
1731  * any name at the same depth; (3) a directory with name "." compares prior
1732  * to anything else.  These changes mean that a directory and a non-dir
1733  * with the same name will not compare as equal (protocol_version >= 29).
1734  *
1735  * The dirname component can be an empty string, but the basename component
1736  * cannot (and never is in the current codebase).  The basename component
1737  * may be NULL (for a removed item), in which case it is considered to be
1738  * after any existing item. */
1739 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1740 {
1741         int dif;
1742         const uchar *c1, *c2;
1743         enum fnc_state state1, state2;
1744         enum fnc_type type1, type2;
1745         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1746
1747         if (!f1 || !f1->basename) {
1748                 if (!f2 || !f2->basename)
1749                         return 0;
1750                 return -1;
1751         }
1752         if (!f2 || !f2->basename)
1753                 return 1;
1754
1755         c1 = (uchar*)f1->dirname;
1756         c2 = (uchar*)f2->dirname;
1757         if (c1 == c2)
1758                 c1 = c2 = NULL;
1759         if (!c1) {
1760                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1761                 c1 = (uchar*)f1->basename;
1762                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1763                         type1 = t_ITEM;
1764                         state1 = s_TRAILING;
1765                         c1 = (uchar*)"";
1766                 } else
1767                         state1 = s_BASE;
1768         } else if (!*c1) {
1769                 type1 = t_path;
1770                 state1 = s_SLASH;
1771                 c1 = (uchar*)"/";
1772         } else {
1773                 type1 = t_path;
1774                 state1 = s_DIR;
1775         }
1776         if (!c2) {
1777                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1778                 c2 = (uchar*)f2->basename;
1779                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1780                         type2 = t_ITEM;
1781                         state2 = s_TRAILING;
1782                         c2 = (uchar*)"";
1783                 } else
1784                         state2 = s_BASE;
1785         } else if (!*c2) {
1786                 type2 = t_path;
1787                 state2 = s_SLASH;
1788                 c2 = (uchar*)"/";
1789         } else {
1790                 type2 = t_path;
1791                 state2 = s_DIR;
1792         }
1793
1794         if (type1 != type2)
1795                 return type1 == t_PATH ? 1 : -1;
1796
1797         while (1) {
1798                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1799                         break;
1800                 if (!*c1) {
1801                         switch (state1) {
1802                         case s_DIR:
1803                                 state1 = s_SLASH;
1804                                 c1 = (uchar*)"/";
1805                                 break;
1806                         case s_SLASH:
1807                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1808                                 c1 = (uchar*)f1->basename;
1809                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1810                                         type1 = t_ITEM;
1811                                         state1 = s_TRAILING;
1812                                         c1 = (uchar*)"";
1813                                 } else
1814                                         state1 = s_BASE;
1815                                 break;
1816                         case s_BASE:
1817                                 state1 = s_TRAILING;
1818                                 if (type1 == t_PATH) {
1819                                         c1 = (uchar*)"/";
1820                                         break;
1821                                 }
1822                                 /* FALL THROUGH */
1823                         case s_TRAILING:
1824                                 type1 = t_ITEM;
1825                                 break;
1826                         }
1827                         if (*c2 && type1 != type2)
1828                                 return type1 == t_PATH ? 1 : -1;
1829                 }
1830                 if (!*c2) {
1831                         switch (state2) {
1832                         case s_DIR:
1833                                 state2 = s_SLASH;
1834                                 c2 = (uchar*)"/";
1835                                 break;
1836                         case s_SLASH:
1837                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1838                                 c2 = (uchar*)f2->basename;
1839                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1840                                         type2 = t_ITEM;
1841                                         state2 = s_TRAILING;
1842                                         c2 = (uchar*)"";
1843                                 } else
1844                                         state2 = s_BASE;
1845                                 break;
1846                         case s_BASE:
1847                                 state2 = s_TRAILING;
1848                                 if (type2 == t_PATH) {
1849                                         c2 = (uchar*)"/";
1850                                         break;
1851                                 }
1852                                 /* FALL THROUGH */
1853                         case s_TRAILING:
1854                                 if (!*c1)
1855                                         return 0;
1856                                 type2 = t_ITEM;
1857                                 break;
1858                         }
1859                         if (type1 != type2)
1860                                 return type1 == t_PATH ? 1 : -1;
1861                 }
1862         }
1863
1864         return dif;
1865 }
1866
1867 /* Return a copy of the full filename of a flist entry, using the indicated
1868  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1869  * done because we checked the size when creating the file_struct entry.
1870  */
1871 char *f_name(struct file_struct *f, char *fbuf)
1872 {
1873         if (!f || !f->basename)
1874                 return NULL;
1875
1876         if (!fbuf) {
1877                 static char names[5][MAXPATHLEN];
1878                 static unsigned int n;
1879
1880                 n = (n + 1) % (sizeof names / sizeof names[0]);
1881
1882                 fbuf = names[n];
1883         }
1884
1885         if (f->dirname) {
1886                 int len = strlen(f->dirname);
1887                 memcpy(fbuf, f->dirname, len);
1888                 fbuf[len] = '/';
1889                 strcpy(fbuf + len + 1, f->basename);
1890         } else
1891                 strcpy(fbuf, f->basename);
1892
1893         return fbuf;
1894 }
1895
1896 /* Do a non-recursive scan of the named directory, possibly ignoring all
1897  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1898  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1899  * buffer (the functions we call will append names onto the end, but the old
1900  * dir value will be restored on exit). */
1901 struct file_list *get_dirlist(char *dirname, int dlen,
1902                               int ignore_filter_rules)
1903 {
1904         struct file_list *dirlist;
1905         char dirbuf[MAXPATHLEN];
1906         int save_recurse = recurse;
1907         int save_xfer_dirs = xfer_dirs;
1908
1909         if (dlen < 0) {
1910                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1911                 if (dlen >= MAXPATHLEN)
1912                         return NULL;
1913                 dirname = dirbuf;
1914         }
1915
1916         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1917
1918         recurse = 0;
1919         xfer_dirs = 1;
1920         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1921         xfer_dirs = save_xfer_dirs;
1922         recurse = save_recurse;
1923         if (do_progress)
1924                 flist_count_offset += dirlist->count;
1925
1926         clean_flist(dirlist, 0, 0);
1927
1928         if (verbose > 3)
1929                 output_flist(dirlist);
1930
1931         return dirlist;
1932 }