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_specials;
  52 extern int preserve_uid;
  53 extern int preserve_gid;
  54 extern int relative_paths;
  55 extern int implied_dirs;
  56 extern int prune_empty_dirs;
  57 extern int copy_links;
  58 extern int copy_unsafe_links;
  59 extern int protocol_version;
  60 extern int sanitize_paths;
  61 extern int orig_umask;
  62 extern struct stats stats;
  63 extern struct file_list *the_file_list;
  64
  65 extern char curr_dir[MAXPATHLEN];
  66
  67 extern struct chmod_mode_struct *chmod_modes;
  68
  69 extern struct filter_list_struct filter_list;
  70 extern struct filter_list_struct server_filter_list;
  71
  72 int io_error;
  73 int checksum_len;
  74 dev_t filesystem_dev; /* used to implement -x */
  75 unsigned int file_struct_len;
  76
  77 static char empty_sum[MD4_SUM_LENGTH];
  78 static int flist_count_offset;
  79
  80 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  81 static void output_flist(struct file_list *flist);
  82
  83 void init_flist(void)
  84 {
  85         struct file_struct f;
  86
  87         /* Figure out how big the file_struct is without trailing padding */
  88         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  89         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
  90 }
  91
  92 static int show_filelist_p(void)
  93 {
  94         return verbose && xfer_dirs && !am_server;
  95 }
  96
  97 static void start_filelist_progress(char *kind)
  98 {
  99         rprintf(FINFO, "%s ... ", kind);
 100         if (verbose > 1 || do_progress)
 101                 rprintf(FINFO, "\n");
 102         rflush(FINFO);
 103 }
 104
 105 static void emit_filelist_progress(int count)
 106 {
 107         rprintf(FINFO, " %d files...\r", count);
 108 }
 109
 110 static void maybe_emit_filelist_progress(int count)
 111 {
 112         if (do_progress && show_filelist_p() && (count % 100) == 0)
 113                 emit_filelist_progress(count);
 114 }
 115
 116 static void finish_filelist_progress(const struct file_list *flist)
 117 {
 118         if (do_progress) {
 119                 /* This overwrites the progress line */
 120                 rprintf(FINFO, "%d file%sto consider\n",
 121                         flist->count, flist->count == 1 ? " " : "s ");
 122         } else
 123                 rprintf(FINFO, "done\n");
 124 }
 125
 126 void show_flist_stats(void)
 127 {
 128         /* Nothing yet */
 129 }
 130
 131 static void list_file_entry(struct file_struct *f)
 132 {
 133         char perms[11];
 134
 135         if (!f->basename) {
 136                 /* this can happen if duplicate names were removed */
 137                 return;
 138         }
 139
 140         permstring(perms, f->mode);
 141
 142 #ifdef SUPPORT_LINKS
 143         if (preserve_links && S_ISLNK(f->mode)) {
 144                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 145                         perms,
 146                         (double)f->length, timestring(f->modtime),
 147                         f_name(f, NULL), f->u.link);
 148         } else
 149 #endif
 150         {
 151                 rprintf(FINFO, "%s %11.0f %s %s\n",
 152                         perms,
 153                         (double)f->length, timestring(f->modtime),
 154                         f_name(f, NULL));
 155         }
 156 }
 157
 158 /**
 159  * Stat either a symlink or its referent, depending on the settings of
 160  * copy_links, copy_unsafe_links, etc.
 161  *
 162  * @retval -1 on error
 163  *
 164  * @retval 0 for success
 165  *
 166  * @post If @p path is a symlink, then @p linkbuf (of size @c
 167  * MAXPATHLEN) contains the symlink target.
 168  *
 169  * @post @p buffer contains information about the link or the
 170  * referrent as appropriate, if they exist.
 171  **/
 172 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 173 {
 174 #ifdef SUPPORT_LINKS
 175         if (copy_links)
 176                 return do_stat(path, buffer);
 177         if (link_stat(path, buffer, 0) < 0)
 178                 return -1;
 179         if (S_ISLNK(buffer->st_mode)) {
 180                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 181                 if (l == -1)
 182                         return -1;
 183                 linkbuf[l] = 0;
 184                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 185                         if (verbose > 1) {
 186                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 187                                         path, linkbuf);
 188                         }
 189                         return do_stat(path, buffer);
 190                 }
 191         }
 192         return 0;
 193 #else
 194         return do_stat(path, buffer);
 195 #endif
 196 }
 197
 198 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 199 {
 200 #ifdef SUPPORT_LINKS
 201         if (copy_links)
 202                 return do_stat(path, buffer);
 203         if (do_lstat(path, buffer) < 0)
 204                 return -1;
 205         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 206                 STRUCT_STAT st;
 207                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 208                         *buffer = st;
 209         }
 210         return 0;
 211 #else
 212         return do_stat(path, buffer);
 213 #endif
 214 }
 215
 216 /* This function is used to check if a file should be included/excluded
 217  * from the list of files based on its name and type etc.  The value of
 218  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 219 static int is_excluded(char *fname, int is_dir, int filter_level)
 220 {
 221 #if 0 /* This currently never happens, so avoid a useless compare. */
 222         if (filter_level == NO_FILTERS)
 223                 return 0;
 224 #endif
 225         if (fname) {
 226                 /* never exclude '.', even if somebody does --exclude '*' */
 227                 if (fname[0] == '.' && !fname[1])
 228                         return 0;
 229                 /* Handle the -R version of the '.' dir. */
 230                 if (fname[0] == '/') {
 231                         int len = strlen(fname);
 232                         if (fname[len-1] == '.' && fname[len-2] == '/')
 233                                 return 0;
 234                 }
 235         }
 236         if (server_filter_list.head
 237             && check_filter(&server_filter_list, fname, is_dir) < 0)
 238                 return 1;
 239         if (filter_level != ALL_FILTERS)
 240                 return 0;
 241         if (filter_list.head
 242             && check_filter(&filter_list, fname, is_dir) < 0)
 243                 return 1;
 244         return 0;
 245 }
 246
 247 static int to_wire_mode(mode_t mode)
 248 {
 249 #ifdef SUPPORT_LINKS
 250         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 251                 return (mode & ~(_S_IFMT)) | 0120000;
 252 #endif
 253         return (int)mode;
 254 }
 255
 256 static mode_t from_wire_mode(int mode)
 257 {
 258         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 259                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 260         return (mode_t)mode;
 261 }
 262
 263 static void send_directory(int f, struct file_list *flist,
 264                            char *fbuf, int len);
 265
 266 static char *flist_dir;
 267 static int flist_dir_len;
 268
 269
 270 /**
 271  * Make sure @p flist is big enough to hold at least @p flist->count
 272  * entries.
 273  **/
 274 void flist_expand(struct file_list *flist)
 275 {
 276         struct file_struct **new_ptr;
 277
 278         if (flist->count < flist->malloced)
 279                 return;
 280
 281         if (flist->malloced < FLIST_START)
 282                 flist->malloced = FLIST_START;
 283         else if (flist->malloced >= FLIST_LINEAR)
 284                 flist->malloced += FLIST_LINEAR;
 285         else
 286                 flist->malloced *= 2;
 287
 288         /*
 289          * In case count jumped or we are starting the list
 290          * with a known size just set it.
 291          */
 292         if (flist->malloced < flist->count)
 293                 flist->malloced = flist->count;
 294
 295         new_ptr = realloc_array(flist->files, struct file_struct *,
 296                                 flist->malloced);
 297
 298         if (verbose >= 2 && flist->malloced != FLIST_START) {
 299                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 300                     who_am_i(),
 301                     (double)sizeof flist->files[0] * flist->malloced,
 302                     (new_ptr == flist->files) ? " not" : "");
 303         }
 304
 305         flist->files = new_ptr;
 306
 307         if (!flist->files)
 308                 out_of_memory("flist_expand");
 309 }
 310
 311 static void send_file_entry(struct file_struct *file, int f)
 312 {
 313         unsigned short flags;
 314         static time_t modtime;
 315         static mode_t mode;
 316         static int64 dev;
 317         static dev_t rdev;
 318         static uint32 rdev_major;
 319         static uid_t uid;
 320         static gid_t gid;
 321         static char lastname[MAXPATHLEN];
 322         char fname[MAXPATHLEN];
 323         int l1, l2;
 324
 325         if (f < 0)
 326                 return;
 327
 328         if (!file) {
 329                 write_byte(f, 0);
 330                 modtime = 0, mode = 0;
 331                 dev = 0, rdev = makedev(0, 0);
 332                 rdev_major = 0;
 333                 uid = 0, gid = 0;
 334                 *lastname = '\0';
 335                 return;
 336         }
 337
 338         io_write_phase = "send_file_entry";
 339
 340         f_name(file, fname);
 341
 342         flags = file->flags & XMIT_TOP_DIR;
 343
 344         if (file->mode == mode)
 345                 flags |= XMIT_SAME_MODE;
 346         else
 347                 mode = file->mode;
 348         if ((preserve_devices && IS_DEVICE(mode))
 349          || (preserve_specials && IS_SPECIAL(mode))) {
 350                 if (protocol_version < 28) {
 351                         if (file->u.rdev == rdev)
 352                                 flags |= XMIT_SAME_RDEV_pre28;
 353                         else
 354                                 rdev = file->u.rdev;
 355                 } else {
 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         } else if (protocol_version < 28)
 365                 rdev = makedev(0, 0);
 366         if (file->uid == uid)
 367                 flags |= XMIT_SAME_UID;
 368         else
 369                 uid = file->uid;
 370         if (file->gid == gid)
 371                 flags |= XMIT_SAME_GID;
 372         else
 373                 gid = file->gid;
 374         if (file->modtime == modtime)
 375                 flags |= XMIT_SAME_TIME;
 376         else
 377                 modtime = file->modtime;
 378
 379 #ifdef SUPPORT_HARD_LINKS
 380         if (file->link_u.idev) {
 381                 if (file->F_DEV == dev) {
 382                         if (protocol_version >= 28)
 383                                 flags |= XMIT_SAME_DEV;
 384                 } else
 385                         dev = file->F_DEV;
 386                 flags |= XMIT_HAS_IDEV_DATA;
 387         }
 388 #endif
 389
 390         for (l1 = 0;
 391             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 392             l1++) {}
 393         l2 = strlen(fname+l1);
 394
 395         if (l1 > 0)
 396                 flags |= XMIT_SAME_NAME;
 397         if (l2 > 255)
 398                 flags |= XMIT_LONG_NAME;
 399
 400         /* We must make sure we don't send a zero flag byte or the
 401          * other end will terminate the flist transfer.  Note that
 402          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 403          * it's harmless way to add a bit to the first flag byte. */
 404         if (protocol_version >= 28) {
 405                 if (!flags && !S_ISDIR(mode))
 406                         flags |= XMIT_TOP_DIR;
 407                 if ((flags & 0xFF00) || !flags) {
 408                         flags |= XMIT_EXTENDED_FLAGS;
 409                         write_byte(f, flags);
 410                         write_byte(f, flags >> 8);
 411                 } else
 412                         write_byte(f, flags);
 413         } else {
 414                 if (!(flags & 0xFF))
 415                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 416                 write_byte(f, flags);
 417         }
 418         if (flags & XMIT_SAME_NAME)
 419                 write_byte(f, l1);
 420         if (flags & XMIT_LONG_NAME)
 421                 write_int(f, l2);
 422         else
 423                 write_byte(f, l2);
 424         write_buf(f, fname + l1, l2);
 425
 426         write_longint(f, file->length);
 427         if (!(flags & XMIT_SAME_TIME))
 428                 write_int(f, modtime);
 429         if (!(flags & XMIT_SAME_MODE))
 430                 write_int(f, to_wire_mode(mode));
 431         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 432                 if (!numeric_ids)
 433                         add_uid(uid);
 434                 write_int(f, uid);
 435         }
 436         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 437                 if (!numeric_ids)
 438                         add_gid(gid);
 439                 write_int(f, gid);
 440         }
 441         if ((preserve_devices && IS_DEVICE(mode))
 442          || (preserve_specials && IS_SPECIAL(mode))) {
 443                 if (protocol_version < 28) {
 444                         if (!(flags & XMIT_SAME_RDEV_pre28))
 445                                 write_int(f, (int)rdev);
 446                 } else {
 447                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 448                                 write_int(f, major(rdev));
 449                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 450                                 write_byte(f, minor(rdev));
 451                         else
 452                                 write_int(f, minor(rdev));
 453                 }
 454         }
 455
 456 #ifdef SUPPORT_LINKS
 457         if (preserve_links && S_ISLNK(mode)) {
 458                 int len = strlen(file->u.link);
 459                 write_int(f, len);
 460                 write_buf(f, file->u.link, len);
 461         }
 462 #endif
 463
 464 #ifdef SUPPORT_HARD_LINKS
 465         if (flags & XMIT_HAS_IDEV_DATA) {
 466                 if (protocol_version < 26) {
 467                         /* 32-bit dev_t and ino_t */
 468                         write_int(f, dev);
 469                         write_int(f, file->F_INODE);
 470                 } else {
 471                         /* 64-bit dev_t and ino_t */
 472                         if (!(flags & XMIT_SAME_DEV))
 473                                 write_longint(f, dev);
 474                         write_longint(f, file->F_INODE);
 475                 }
 476         }
 477 #endif
 478
 479         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 480                 char *sum;
 481                 if (S_ISREG(mode))
 482                         sum = file->u.sum;
 483                 else {
 484                         /* Prior to 28, we sent a useless set of nulls. */
 485                         sum = empty_sum;
 486                 }
 487                 write_buf(f, sum, checksum_len);
 488         }
 489
 490         strlcpy(lastname, fname, MAXPATHLEN);
 491
 492         io_write_phase = "unknown";
 493 }
 494
 495 static struct file_struct *receive_file_entry(struct file_list *flist,
 496                                               unsigned short flags, int f)
 497 {
 498         static time_t modtime;
 499         static mode_t mode;
 500         static int64 dev;
 501         static dev_t rdev;
 502         static uint32 rdev_major;
 503         static uid_t uid;
 504         static gid_t gid;
 505         static char lastname[MAXPATHLEN], *lastdir;
 506         static int lastdir_depth, lastdir_len = -1;
 507         static unsigned int del_hier_name_len = 0;
 508         static int in_del_hier = 0;
 509         char thisname[MAXPATHLEN];
 510         unsigned int l1 = 0, l2 = 0;
 511         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 512         OFF_T file_length;
 513         char *basename, *dirname, *bp;
 514         struct file_struct *file;
 515
 516         if (!flist) {
 517                 modtime = 0, mode = 0;
 518                 dev = 0, rdev = makedev(0, 0);
 519                 rdev_major = 0;
 520                 uid = 0, gid = 0;
 521                 *lastname = '\0';
 522                 lastdir_len = -1;
 523                 in_del_hier = 0;
 524                 return NULL;
 525         }
 526
 527         if (flags & XMIT_SAME_NAME)
 528                 l1 = read_byte(f);
 529
 530         if (flags & XMIT_LONG_NAME)
 531                 l2 = read_int(f);
 532         else
 533                 l2 = read_byte(f);
 534
 535         if (l2 >= MAXPATHLEN - l1) {
 536                 rprintf(FERROR,
 537                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 538                         flags, l1, l2, lastname);
 539                 overflow_exit("receive_file_entry");
 540         }
 541
 542         strlcpy(thisname, lastname, l1 + 1);
 543         read_sbuf(f, &thisname[l1], l2);
 544         thisname[l1 + l2] = 0;
 545
 546         strlcpy(lastname, thisname, MAXPATHLEN);
 547
 548         clean_fname(thisname, 0);
 549
 550         if (sanitize_paths)
 551                 sanitize_path(thisname, thisname, "", 0);
 552
 553         if ((basename = strrchr(thisname, '/')) != NULL) {
 554                 dirname_len = ++basename - thisname; /* counts future '\0' */
 555                 if (lastdir_len == dirname_len - 1
 556                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 557                         dirname = lastdir;
 558                         dirname_len = 0; /* indicates no copy is needed */
 559                 } else
 560                         dirname = thisname;
 561         } else {
 562                 basename = thisname;
 563                 dirname = NULL;
 564                 dirname_len = 0;
 565         }
 566         basename_len = strlen(basename) + 1; /* count the '\0' */
 567
 568         file_length = read_longint(f);
 569         if (!(flags & XMIT_SAME_TIME))
 570                 modtime = (time_t)read_int(f);
 571         if (!(flags & XMIT_SAME_MODE))
 572                 mode = from_wire_mode(read_int(f));
 573
 574         if (chmod_modes && !S_ISLNK(mode))
 575                 mode = tweak_mode(mode, chmod_modes);
 576
 577         if (preserve_uid && !(flags & XMIT_SAME_UID))
 578                 uid = (uid_t)read_int(f);
 579         if (preserve_gid && !(flags & XMIT_SAME_GID))
 580                 gid = (gid_t)read_int(f);
 581
 582         if ((preserve_devices && IS_DEVICE(mode))
 583          || (preserve_specials && IS_SPECIAL(mode))) {
 584                 if (protocol_version < 28) {
 585                         if (!(flags & XMIT_SAME_RDEV_pre28))
 586                                 rdev = (dev_t)read_int(f);
 587                 } else {
 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         } else if (protocol_version < 28)
 598                 rdev = makedev(0, 0);
 599
 600 #ifdef SUPPORT_LINKS
 601         if (preserve_links && S_ISLNK(mode)) {
 602                 linkname_len = read_int(f) + 1; /* count the '\0' */
 603                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 604                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 605                                 linkname_len - 1);
 606                         overflow_exit("receive_file_entry");
 607                 }
 608         }
 609         else
 610 #endif
 611                 linkname_len = 0;
 612
 613         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 614
 615         alloc_len = file_struct_len + dirname_len + basename_len
 616                   + linkname_len + sum_len;
 617         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 618
 619         file = (struct file_struct *)bp;
 620         memset(bp, 0, file_struct_len);
 621         bp += file_struct_len;
 622
 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          || (preserve_specials && IS_SPECIAL(mode)))
 670                 file->u.rdev = rdev;
 671
 672 #ifdef SUPPORT_LINKS
 673         if (linkname_len) {
 674                 file->u.link = bp;
 675                 read_sbuf(f, bp, linkname_len - 1);
 676                 if (sanitize_paths)
 677                         sanitize_path(bp, bp, "", lastdir_depth);
 678                 bp += linkname_len;
 679         }
 680 #endif
 681
 682 #ifdef SUPPORT_HARD_LINKS
 683         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 684                 flags |= XMIT_HAS_IDEV_DATA;
 685         if (flags & XMIT_HAS_IDEV_DATA) {
 686                 int64 inode;
 687                 if (protocol_version < 26) {
 688                         dev = read_int(f);
 689                         inode = read_int(f);
 690                 } else {
 691                         if (!(flags & XMIT_SAME_DEV))
 692                                 dev = read_longint(f);
 693                         inode = read_longint(f);
 694                 }
 695                 if (flist->hlink_pool) {
 696                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 697                             struct idev, 1, "inode_table");
 698                         file->F_INODE = inode;
 699                         file->F_DEV = dev;
 700                 }
 701         }
 702 #endif
 703
 704         if (always_checksum && (sum_len || protocol_version < 28)) {
 705                 char *sum;
 706                 if (sum_len) {
 707                         file->u.sum = sum = bp;
 708                         /*bp += sum_len;*/
 709                 } else {
 710                         /* Prior to 28, we get a useless set of nulls. */
 711                         sum = empty_sum;
 712                 }
 713                 read_buf(f, sum, checksum_len);
 714         }
 715
 716         if (!preserve_perms) {
 717                 /* set an appropriate set of permissions based on original
 718                  * permissions and umask. This emulates what GNU cp does */
 719                 file->mode &= ~orig_umask;
 720         }
 721
 722         return file;
 723 }
 724
 725 /**
 726  * Create a file_struct for a named file by reading its stat()
 727  * information and performing extensive checks against global
 728  * options.
 729  *
 730  * @return the new file, or NULL if there was an error or this file
 731  * should be excluded.
 732  *
 733  * @todo There is a small optimization opportunity here to avoid
 734  * stat()ing the file in some circumstances, which has a certain cost.
 735  * We are called immediately after doing readdir(), and so we may
 736  * already know the d_type of the file.  We could for example avoid
 737  * statting directories if we're not recursing, but this is not a very
 738  * important case.  Some systems may not have d_type.
 739  **/
 740 struct file_struct *make_file(char *fname, struct file_list *flist,
 741                               STRUCT_STAT *stp, unsigned short flags,
 742                               int filter_level)
 743 {
 744         static char *lastdir;
 745         static int lastdir_len = -1;
 746         struct file_struct *file;
 747         STRUCT_STAT st;
 748         char sum[SUM_LENGTH];
 749         char thisname[MAXPATHLEN];
 750         char linkname[MAXPATHLEN];
 751         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 752         char *basename, *dirname, *bp;
 753
 754         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 755                 lastdir_len = -1;
 756
 757         if (strlcpy(thisname, fname, sizeof thisname)
 758             >= sizeof thisname - flist_dir_len) {
 759                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 760                 return NULL;
 761         }
 762         clean_fname(thisname, 0);
 763         if (sanitize_paths)
 764                 sanitize_path(thisname, thisname, "", 0);
 765
 766         memset(sum, 0, SUM_LENGTH);
 767
 768         if (stp && S_ISDIR(stp->st_mode))
 769                 st = *stp; /* Needed for "symlink/." with --relative. */
 770         else if (readlink_stat(thisname, &st, linkname) != 0) {
 771                 int save_errno = errno;
 772                 /* See if file is excluded before reporting an error. */
 773                 if (filter_level != NO_FILTERS
 774                     && is_excluded(thisname, 0, filter_level))
 775                         return NULL;
 776                 if (save_errno == ENOENT) {
 777 #ifdef SUPPORT_LINKS
 778                         /* Avoid "vanished" error if symlink points nowhere. */
 779                         if (copy_links && do_lstat(thisname, &st) == 0
 780                             && S_ISLNK(st.st_mode)) {
 781                                 io_error |= IOERR_GENERAL;
 782                                 rprintf(FERROR, "symlink has no referent: %s\n",
 783                                         full_fname(thisname));
 784                         } else
 785 #endif
 786                         {
 787                                 enum logcode c = am_daemon && protocol_version < 28
 788                                     ? FERROR : FINFO;
 789                                 io_error |= IOERR_VANISHED;
 790                                 rprintf(c, "file has vanished: %s\n",
 791                                         full_fname(thisname));
 792                         }
 793                 } else {
 794                         io_error |= IOERR_GENERAL;
 795                         rsyserr(FERROR, save_errno, "readlink %s failed",
 796                                 full_fname(thisname));
 797                 }
 798                 return NULL;
 799         }
 800
 801         /* backup.c calls us with filter_level set to NO_FILTERS. */
 802         if (filter_level == NO_FILTERS)
 803                 goto skip_filters;
 804
 805         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 806                 rprintf(FINFO, "skipping directory %s\n", thisname);
 807                 return NULL;
 808         }
 809
 810         /* We only care about directories because we need to avoid recursing
 811          * into a mount-point directory, not to avoid copying a symlinked
 812          * file if -L (or similar) was specified. */
 813         if (one_file_system && st.st_dev != filesystem_dev
 814          && S_ISDIR(st.st_mode)) {
 815                 if (one_file_system > 1) {
 816                         if (verbose > 2) {
 817                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 818                                         thisname);
 819                         }
 820                         return NULL;
 821                 }
 822                 flags |= FLAG_MOUNT_POINT;
 823         }
 824
 825         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 826                 return NULL;
 827
 828         if (lp_ignore_nonreadable(module_id)) {
 829 #ifdef SUPPORT_LINKS
 830                 if (!S_ISLNK(st.st_mode))
 831 #endif
 832                         if (access(thisname, R_OK) != 0)
 833                                 return NULL;
 834         }
 835
 836   skip_filters:
 837
 838         if (verbose > 2) {
 839                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 840                         who_am_i(), thisname, filter_level);
 841         }
 842
 843         if ((basename = strrchr(thisname, '/')) != NULL) {
 844                 dirname_len = ++basename - thisname; /* counts future '\0' */
 845                 if (lastdir_len == dirname_len - 1
 846                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 847                         dirname = lastdir;
 848                         dirname_len = 0; /* indicates no copy is needed */
 849                 } else
 850                         dirname = thisname;
 851         } else {
 852                 basename = thisname;
 853                 dirname = NULL;
 854                 dirname_len = 0;
 855         }
 856         basename_len = strlen(basename) + 1; /* count the '\0' */
 857
 858 #ifdef SUPPORT_LINKS
 859         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 860 #else
 861         linkname_len = 0;
 862 #endif
 863
 864         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 865                 ? MD4_SUM_LENGTH : 0;
 866
 867         alloc_len = file_struct_len + dirname_len + basename_len
 868             + linkname_len + sum_len;
 869         if (flist)
 870                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 871         else {
 872                 if (!(bp = new_array(char, alloc_len)))
 873                         out_of_memory("make_file");
 874         }
 875
 876         file = (struct file_struct *)bp;
 877         memset(bp, 0, file_struct_len);
 878         bp += file_struct_len;
 879
 880         file->flags = flags;
 881         file->modtime = st.st_mtime;
 882         file->length = st.st_size;
 883         file->mode = st.st_mode;
 884         file->uid = st.st_uid;
 885         file->gid = st.st_gid;
 886
 887 #ifdef SUPPORT_HARD_LINKS
 888         if (flist && flist->hlink_pool) {
 889                 if (protocol_version < 28) {
 890                         if (S_ISREG(st.st_mode))
 891                                 file->link_u.idev = pool_talloc(
 892                                     flist->hlink_pool, struct idev, 1,
 893                                     "inode_table");
 894                 } else {
 895                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 896                                 file->link_u.idev = pool_talloc(
 897                                     flist->hlink_pool, struct idev, 1,
 898                                     "inode_table");
 899                 }
 900         }
 901         if (file->link_u.idev) {
 902                 file->F_DEV = st.st_dev;
 903                 file->F_INODE = st.st_ino;
 904         }
 905 #endif
 906
 907         if (dirname_len) {
 908                 file->dirname = lastdir = bp;
 909                 lastdir_len = dirname_len - 1;
 910                 memcpy(bp, dirname, dirname_len - 1);
 911                 bp += dirname_len;
 912                 bp[-1] = '\0';
 913         } else if (dirname)
 914                 file->dirname = dirname;
 915
 916         file->basename = bp;
 917         memcpy(bp, basename, basename_len);
 918         bp += basename_len;
 919
 920 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 921         if ((preserve_devices && IS_DEVICE(st.st_mode))
 922          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 923                 file->u.rdev = st.st_rdev;
 924 #endif
 925
 926 #ifdef SUPPORT_LINKS
 927         if (linkname_len) {
 928                 file->u.link = bp;
 929                 memcpy(bp, linkname, linkname_len);
 930                 bp += linkname_len;
 931         }
 932 #endif
 933
 934         if (sum_len) {
 935                 file->u.sum = bp;
 936                 file_checksum(thisname, bp, st.st_size);
 937                 /*bp += sum_len;*/
 938         }
 939
 940         file->dir.root = flist_dir;
 941
 942         /* This code is only used by the receiver when it is building
 943          * a list of files for a delete pass. */
 944         if (keep_dirlinks && linkname_len && flist) {
 945                 STRUCT_STAT st2;
 946                 int save_mode = file->mode;
 947                 file->mode = S_IFDIR; /* Find a directory with our name. */
 948                 if (flist_find(the_file_list, file) >= 0
 949                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 950                         file->modtime = st2.st_mtime;
 951                         file->length = st2.st_size;
 952                         file->mode = st2.st_mode;
 953                         file->uid = st2.st_uid;
 954                         file->gid = st2.st_gid;
 955                         file->u.link = NULL;
 956                 } else
 957                         file->mode = save_mode;
 958         }
 959
 960         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 961                 stats.total_size += st.st_size;
 962
 963         return file;
 964 }
 965
 966 static struct file_struct *send_file_name(int f, struct file_list *flist,
 967                                           char *fname, STRUCT_STAT *stp,
 968                                           unsigned short flags)
 969 {
 970         struct file_struct *file;
 971
 972         file = make_file(fname, flist, stp, flags,
 973                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 974         if (!file)
 975                 return NULL;
 976
 977         if (chmod_modes && !S_ISLNK(file->mode))
 978                 file->mode = tweak_mode(file->mode, chmod_modes);
 979
 980         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 981
 982         flist_expand(flist);
 983
 984         if (file->basename[0]) {
 985                 flist->files[flist->count++] = file;
 986                 send_file_entry(file, f);
 987         }
 988         return file;
 989 }
 990
 991 static void send_if_directory(int f, struct file_list *flist,
 992                               struct file_struct *file,
 993                               char *fbuf, unsigned int ol)
 994 {
 995         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 996
 997         if (S_ISDIR(file->mode)
 998             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 999                 void *save_filters;
1000                 unsigned int len = strlen(fbuf);
1001                 if (len > 1 && fbuf[len-1] == '/')
1002                         fbuf[--len] = '\0';
1003                 if (len >= MAXPATHLEN - 1) {
1004                         io_error |= IOERR_GENERAL;
1005                         rprintf(FERROR, "skipping long-named directory: %s\n",
1006                                 full_fname(fbuf));
1007                         return;
1008                 }
1009                 save_filters = push_local_filters(fbuf, len);
1010                 send_directory(f, flist, fbuf, len);
1011                 pop_local_filters(save_filters);
1012                 fbuf[ol] = '\0';
1013                 if (is_dot_dir)
1014                         fbuf[ol-1] = '.';
1015         }
1016 }
1017
1018 /* This function is normally called by the sender, but the receiving side also
1019  * calls it from get_dirlist() with f set to -1 so that we just construct the
1020  * file list in memory without sending it over the wire.  Also, get_dirlist()
1021  * might call this with f set to -2, which also indicates that local filter
1022  * rules should be ignored. */
1023 static void send_directory(int f, struct file_list *flist,
1024                            char *fbuf, int len)
1025 {
1026         struct dirent *di;
1027         unsigned remainder;
1028         char *p;
1029         DIR *d;
1030         int start = flist->count;
1031
1032         if (!(d = opendir(fbuf))) {
1033                 io_error |= IOERR_GENERAL;
1034                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1035                 return;
1036         }
1037
1038         p = fbuf + len;
1039         if (len != 1 || *fbuf != '/')
1040                 *p++ = '/';
1041         *p = '\0';
1042         remainder = MAXPATHLEN - (p - fbuf);
1043
1044         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1045                 char *dname = d_name(di);
1046                 if (dname[0] == '.' && (dname[1] == '\0'
1047                     || (dname[1] == '.' && dname[2] == '\0')))
1048                         continue;
1049                 if (strlcpy(p, dname, remainder) >= remainder) {
1050                         io_error |= IOERR_GENERAL;
1051                         rprintf(FINFO,
1052                                 "cannot send long-named file %s\n",
1053                                 full_fname(fbuf));
1054                         continue;
1055                 }
1056
1057                 send_file_name(f, flist, fbuf, NULL, 0);
1058         }
1059
1060         fbuf[len] = '\0';
1061
1062         if (errno) {
1063                 io_error |= IOERR_GENERAL;
1064                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1065         }
1066
1067         closedir(d);
1068
1069         if (recurse) {
1070                 int i, end = flist->count - 1;
1071                 for (i = start; i <= end; i++)
1072                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1073         }
1074 }
1075
1076 struct file_list *send_file_list(int f, int argc, char *argv[])
1077 {
1078         int len;
1079         STRUCT_STAT st;
1080         char *p, *dir, olddir[sizeof curr_dir];
1081         char lastpath[MAXPATHLEN] = "";
1082         struct file_list *flist;
1083         struct timeval start_tv, end_tv;
1084         int64 start_write;
1085         int use_ff_fd = 0;
1086
1087         if (show_filelist_p())
1088                 start_filelist_progress("building file list");
1089
1090         start_write = stats.total_written;
1091         gettimeofday(&start_tv, NULL);
1092
1093         flist = flist_new(WITH_HLINK, "send_file_list");
1094
1095         io_start_buffering_out();
1096         if (filesfrom_fd >= 0) {
1097                 if (argv[0] && !push_dir(argv[0])) {
1098                         rsyserr(FERROR, errno, "push_dir %s failed",
1099                                 full_fname(argv[0]));
1100                         exit_cleanup(RERR_FILESELECT);
1101                 }
1102                 use_ff_fd = 1;
1103         }
1104
1105         while (1) {
1106                 char fbuf[MAXPATHLEN];
1107                 char *fn;
1108                 int is_dot_dir;
1109
1110                 if (use_ff_fd) {
1111                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1112                                 break;
1113                         sanitize_path(fbuf, fbuf, "", 0);
1114                 } else {
1115                         if (argc-- == 0)
1116                                 break;
1117                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1118                         if (sanitize_paths)
1119                                 sanitize_path(fbuf, fbuf, "", 0);
1120                 }
1121
1122                 len = strlen(fbuf);
1123                 if (relative_paths) {
1124                         /* We clean up fbuf below. */
1125                         is_dot_dir = 0;
1126                 } else if (!len || fbuf[len - 1] == '/') {
1127                         if (len == 2 && fbuf[0] == '.') {
1128                                 /* Turn "./" into just "." rather than "./." */
1129                                 fbuf[1] = '\0';
1130                         } else {
1131                                 if (len + 1 >= MAXPATHLEN)
1132                                         overflow_exit("send_file_list");
1133                                 fbuf[len++] = '.';
1134                                 fbuf[len] = '\0';
1135                         }
1136                         is_dot_dir = 1;
1137                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1138                     && (len == 2 || fbuf[len-3] == '/')) {
1139                         if (len + 2 >= MAXPATHLEN)
1140                                 overflow_exit("send_file_list");
1141                         fbuf[len++] = '/';
1142                         fbuf[len++] = '.';
1143                         fbuf[len] = '\0';
1144                         is_dot_dir = 1;
1145                 } else {
1146                         is_dot_dir = fbuf[len-1] == '.'
1147                                    && (len == 1 || fbuf[len-2] == '/');
1148                 }
1149
1150                 if (link_stat(fbuf, &st, keep_dirlinks) != 0) {
1151                         io_error |= IOERR_GENERAL;
1152                         rsyserr(FERROR, errno, "link_stat %s failed",
1153                                 full_fname(fbuf));
1154                         continue;
1155                 }
1156
1157                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1158                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1159                         continue;
1160                 }
1161
1162                 dir = NULL;
1163                 olddir[0] = '\0';
1164
1165                 if (!relative_paths) {
1166                         p = strrchr(fbuf, '/');
1167                         if (p) {
1168                                 *p = '\0';
1169                                 if (p == fbuf)
1170                                         dir = "/";
1171                                 else
1172                                         dir = fbuf;
1173                                 len -= p - fbuf + 1;
1174                                 fn = p + 1;
1175                         } else
1176                                 fn = fbuf;
1177                 } else {
1178                         if ((p = strstr(fbuf, "/./")) != NULL) {
1179                                 *p = '\0';
1180                                 if (p == fbuf)
1181                                         dir = "/";
1182                                 else
1183                                         dir = fbuf;
1184                                 len -= p - fbuf + 3;
1185                                 fn = p + 3;
1186                         } else
1187                                 fn = fbuf;
1188                         /* Get rid of trailing "/" and "/.". */
1189                         while (len) {
1190                                 if (fn[len - 1] == '/') {
1191                                         is_dot_dir = 1;
1192                                         if (!--len && !dir) {
1193                                                 len++;
1194                                                 break;
1195                                         }
1196                                 }
1197                                 else if (len >= 2 && fn[len - 1] == '.'
1198                                                   && fn[len - 2] == '/') {
1199                                         is_dot_dir = 1;
1200                                         if (!(len -= 2) && !dir) {
1201                                                 len++;
1202                                                 break;
1203                                         }
1204                                 } else
1205                                         break;
1206                         }
1207                         fn[len] = '\0';
1208                         /* Reject a ".." dir in the active part of the path. */
1209                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1210                                 if ((p[2] == '/' || p[2] == '\0')
1211                                  && (p == fn || p[-1] == '/')) {
1212                                         rprintf(FERROR,
1213                                             "found \"..\" dir in relative path: %s\n",
1214                                             fbuf);
1215                                         exit_cleanup(RERR_SYNTAX);
1216                                 }
1217                         }
1218                 }
1219
1220                 if (!*fn) {
1221                         len = 1;
1222                         fn = ".";
1223                 }
1224
1225                 if (dir && *dir) {
1226                         static char *lastdir;
1227                         static int lastdir_len;
1228
1229                         strlcpy(olddir, curr_dir, sizeof olddir);
1230
1231                         if (!push_dir(dir)) {
1232                                 io_error |= IOERR_GENERAL;
1233                                 rsyserr(FERROR, errno, "push_dir %s failed",
1234                                         full_fname(dir));
1235                                 continue;
1236                         }
1237
1238                         if (lastdir && strcmp(lastdir, dir) == 0) {
1239                                 flist_dir = lastdir;
1240                                 flist_dir_len = lastdir_len;
1241                         } else {
1242                                 flist_dir = lastdir = strdup(dir);
1243                                 flist_dir_len = lastdir_len = strlen(dir);
1244                         }
1245                 }
1246
1247                 if (fn != fbuf)
1248                         memmove(fbuf, fn, len + 1);
1249
1250                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1251                         /* Send the implied directories at the start of the
1252                          * source spec, so we get their permissions right. */
1253                         char *lp = lastpath, *slash = fbuf;
1254                         *p = '\0';
1255                         /* Skip any initial directories in our path that we
1256                          * have in common with lastpath. */
1257                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1258                                 if (*fn == '/')
1259                                         slash = fn;
1260                         }
1261                         *p = '/';
1262                         if (fn != p || (*lp && *lp != '/')) {
1263                                 int save_copy_links = copy_links;
1264                                 int save_xfer_dirs = xfer_dirs;
1265                                 copy_links = copy_unsafe_links;
1266                                 xfer_dirs = 1;
1267                                 while ((slash = strchr(slash+1, '/')) != 0) {
1268                                         *slash = '\0';
1269                                         send_file_name(f, flist, fbuf, NULL, 0);
1270                                         *slash = '/';
1271                                 }
1272                                 copy_links = save_copy_links;
1273                                 xfer_dirs = save_xfer_dirs;
1274                                 *p = '\0';
1275                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1276                                 *p = '/';
1277                         }
1278                 }
1279
1280                 if (one_file_system)
1281                         filesystem_dev = st.st_dev;
1282
1283                 if (recurse || (xfer_dirs && is_dot_dir)) {
1284                         struct file_struct *file;
1285                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1286                         if (file)
1287                                 send_if_directory(f, flist, file, fbuf, len);
1288                 } else
1289                         send_file_name(f, flist, fbuf, &st, 0);
1290
1291                 if (olddir[0]) {
1292                         flist_dir = NULL;
1293                         flist_dir_len = 0;
1294                         if (!pop_dir(olddir)) {
1295                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1296                                         full_fname(olddir));
1297                                 exit_cleanup(RERR_FILESELECT);
1298                         }
1299                 }
1300         }
1301
1302         gettimeofday(&end_tv, NULL);
1303         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1304                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1305         if (stats.flist_buildtime == 0)
1306                 stats.flist_buildtime = 1;
1307         start_tv = end_tv;
1308
1309         send_file_entry(NULL, f);
1310
1311         if (show_filelist_p())
1312                 finish_filelist_progress(flist);
1313
1314         gettimeofday(&end_tv, NULL);
1315         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1316                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1317
1318         if (flist->hlink_pool) {
1319                 pool_destroy(flist->hlink_pool);
1320                 flist->hlink_pool = NULL;
1321         }
1322
1323         /* Sort the list without removing any duplicates.  This allows the
1324          * receiving side to ask for any name they like, which gives us the
1325          * flexibility to change the way we unduplicate names in the future
1326          * without causing a compatibility problem with older versions. */
1327         clean_flist(flist, 0, 0);
1328
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                 recv_uid_list(f, flist);
1399
1400                 /* Recv the io_error flag */
1401                 if (lp_ignore_errors(module_id) || ignore_errors)
1402                         read_int(f);
1403                 else
1404                         io_error |= read_int(f);
1405         }
1406
1407         if (verbose > 3)
1408                 output_flist(flist);
1409
1410         if (list_only) {
1411                 int i;
1412                 for (i = 0; i < flist->count; i++)
1413                         list_file_entry(flist->files[i]);
1414         }
1415
1416         if (verbose > 2)
1417                 rprintf(FINFO, "recv_file_list done\n");
1418
1419         stats.flist_size = stats.total_read - start_read;
1420         stats.num_files = flist->count;
1421
1422         return flist;
1423
1424   oom:
1425         out_of_memory("recv_file_list");
1426         return NULL;            /* not reached */
1427 }
1428
1429 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1430 {
1431         return f_name_cmp(*file1, *file2);
1432 }
1433
1434 /* Search for an identically-named item in the file list.  Note that the
1435  * items must agree in their directory-ness, or no match is returned. */
1436 int flist_find(struct file_list *flist, struct file_struct *f)
1437 {
1438         int low = flist->low, high = flist->high;
1439         int diff, mid, mid_up;
1440
1441         while (low <= high) {
1442                 mid = (low + high) / 2;
1443                 if (flist->files[mid]->basename)
1444                         mid_up = mid;
1445                 else {
1446                         /* Scan for the next non-empty entry using the cached
1447                          * distance values.  If the value isn't fully up-to-
1448                          * date, update it. */
1449                         mid_up = mid + flist->files[mid]->dir.depth;
1450                         if (!flist->files[mid_up]->basename) {
1451                                 do {
1452                                     mid_up += flist->files[mid_up]->dir.depth;
1453                                 } while (!flist->files[mid_up]->basename);
1454                                 flist->files[mid]->dir.depth = mid_up - mid;
1455                         }
1456                         if (mid_up > high) {
1457                                 /* If there's nothing left above us, set high to
1458                                  * a non-empty entry below us and continue. */
1459                                 high = mid - flist->files[mid]->length;
1460                                 if (!flist->files[high]->basename) {
1461                                         do {
1462                                             high -= flist->files[high]->length;
1463                                         } while (!flist->files[high]->basename);
1464                                         flist->files[mid]->length = mid - high;
1465                                 }
1466                                 continue;
1467                         }
1468                 }
1469                 diff = f_name_cmp(flist->files[mid_up], f);
1470                 if (diff == 0) {
1471                         if (protocol_version < 29
1472                             && S_ISDIR(flist->files[mid_up]->mode)
1473                             != S_ISDIR(f->mode))
1474                                 return -1;
1475                         return mid_up;
1476                 }
1477                 if (diff < 0)
1478                         low = mid_up + 1;
1479                 else
1480                         high = mid - 1;
1481         }
1482         return -1;
1483 }
1484
1485 /*
1486  * Free up any resources a file_struct has allocated
1487  * and clear the file.
1488  */
1489 void clear_file(struct file_struct *file, struct file_list *flist)
1490 {
1491         if (flist->hlink_pool && file->link_u.idev)
1492                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1493         memset(file, 0, file_struct_len);
1494         /* In an empty entry, dir.depth is an offset to the next non-empty
1495          * entry.  Likewise for length in the opposite direction.  We assume
1496          * that we're alone for now since flist_find() will collate adjacent
1497          * items for any entries that are encountered during the find. */
1498         file->length = file->dir.depth = 1;
1499 }
1500
1501 /*
1502  * allocate a new file list
1503  */
1504 struct file_list *flist_new(int with_hlink, char *msg)
1505 {
1506         struct file_list *flist;
1507
1508         flist = new(struct file_list);
1509         if (!flist)
1510                 out_of_memory(msg);
1511
1512         memset(flist, 0, sizeof (struct file_list));
1513
1514         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1515             out_of_memory, POOL_INTERN)))
1516                 out_of_memory(msg);
1517
1518 #ifdef SUPPORT_HARD_LINKS
1519         if (with_hlink && preserve_hard_links) {
1520                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1521                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1522                         out_of_memory(msg);
1523         }
1524 #endif
1525
1526         return flist;
1527 }
1528
1529 /*
1530  * free up all elements in a flist
1531  */
1532 void flist_free(struct file_list *flist)
1533 {
1534         pool_destroy(flist->file_pool);
1535         pool_destroy(flist->hlink_pool);
1536         free(flist->files);
1537         free(flist);
1538 }
1539
1540 /*
1541  * This routine ensures we don't have any duplicate names in our file list.
1542  * duplicate names can cause corruption because of the pipelining
1543  */
1544 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1545 {
1546         char fbuf[MAXPATHLEN];
1547         int i, prev_i = 0;
1548
1549         if (!flist)
1550                 return;
1551         if (flist->count == 0) {
1552                 flist->high = -1;
1553                 return;
1554         }
1555
1556         qsort(flist->files, flist->count,
1557             sizeof flist->files[0], (int (*)())file_compare);
1558
1559         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1560                 if (flist->files[i]->basename) {
1561                         prev_i = i;
1562                         break;
1563                 }
1564         }
1565         flist->low = prev_i;
1566         while (++i < flist->count) {
1567                 int j;
1568                 struct file_struct *file = flist->files[i];
1569
1570                 if (!file->basename)
1571                         continue;
1572                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1573                         j = prev_i;
1574                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1575                         int save_mode = file->mode;
1576                         /* Make sure that this directory doesn't duplicate a
1577                          * non-directory earlier in the list. */
1578                         flist->high = prev_i;
1579                         file->mode = S_IFREG;
1580                         j = flist_find(flist, file);
1581                         file->mode = save_mode;
1582                 } else
1583                         j = -1;
1584                 if (j >= 0) {
1585                         struct file_struct *fp = flist->files[j];
1586                         int keep, drop;
1587                         /* If one is a dir and the other is not, we want to
1588                          * keep the dir because it might have contents in the
1589                          * list. */
1590                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1591                                 if (S_ISDIR(file->mode))
1592                                         keep = i, drop = j;
1593                                 else
1594                                         keep = j, drop = i;
1595                         } else
1596                                 keep = j, drop = i;
1597                         if (verbose > 1 && !am_server) {
1598                                 rprintf(FINFO,
1599                                         "removing duplicate name %s from file list (%d)\n",
1600                                         f_name(file, fbuf), drop);
1601                         }
1602                         /* Make sure we don't lose track of a user-specified
1603                          * top directory. */
1604                         flist->files[keep]->flags |= flist->files[drop]->flags
1605                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1606
1607                         clear_file(flist->files[drop], flist);
1608
1609                         if (keep == i) {
1610                                 if (flist->low == drop) {
1611                                         for (j = drop + 1;
1612                                              j < i && !flist->files[j]->basename;
1613                                              j++) {}
1614                                         flist->low = j;
1615                                 }
1616                                 prev_i = i;
1617                         }
1618                 } else
1619                         prev_i = i;
1620         }
1621         flist->high = no_dups ? prev_i : flist->count - 1;
1622
1623         if (strip_root) {
1624                 /* We need to strip off the leading slashes for relative
1625                  * paths, but this must be done _after_ the sorting phase. */
1626                 for (i = flist->low; i <= flist->high; i++) {
1627                         struct file_struct *file = flist->files[i];
1628
1629                         if (!file->dirname)
1630                                 continue;
1631                         while (*file->dirname == '/')
1632                                 file->dirname++;
1633                         if (!*file->dirname)
1634                                 file->dirname = NULL;
1635                 }
1636         }
1637
1638         if (prune_empty_dirs && no_dups) {
1639                 int j, prev_depth = 0;
1640
1641                 prev_i = 0; /* It's OK that this isn't really true. */
1642
1643                 for (i = flist->low; i <= flist->high; i++) {
1644                         struct file_struct *fp, *file = flist->files[i];
1645
1646                         /* This temporarily abuses the dir.depth value for a
1647                          * directory that is in a chain that might get pruned.
1648                          * We restore the old value if it gets a reprieve. */
1649                         if (S_ISDIR(file->mode) && file->dir.depth) {
1650                                 /* Dump empty dirs when coming back down. */
1651                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1652                                         fp = flist->files[prev_i];
1653                                         if (fp->dir.depth >= 0)
1654                                                 break;
1655                                         prev_i = -fp->dir.depth-1;
1656                                         clear_file(fp, flist);
1657                                 }
1658                                 prev_depth = file->dir.depth;
1659                                 if (is_excluded(f_name(file, fbuf), 1,
1660                                                        ALL_FILTERS)) {
1661                                         /* Keep dirs through this dir. */
1662                                         for (j = prev_depth-1; ; 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                                 } else
1670                                         file->dir.depth = -prev_i-1;
1671                                 prev_i = i;
1672                         } else {
1673                                 /* Keep dirs through this non-dir. */
1674                                 for (j = prev_depth; ; j--) {
1675                                         fp = flist->files[prev_i];
1676                                         if (fp->dir.depth >= 0)
1677                                                 break;
1678                                         prev_i = -fp->dir.depth-1;
1679                                         fp->dir.depth = j;
1680                                 }
1681                         }
1682                 }
1683                 /* Dump empty all remaining empty dirs. */
1684                 while (1) {
1685                         struct file_struct *fp = flist->files[prev_i];
1686                         if (fp->dir.depth >= 0)
1687                                 break;
1688                         prev_i = -fp->dir.depth-1;
1689                         clear_file(fp, flist);
1690                 }
1691
1692                 for (i = flist->low; i <= flist->high; i++) {
1693                         if (flist->files[i]->basename)
1694                                 break;
1695                 }
1696                 flist->low = i;
1697                 for (i = flist->high; i >= flist->low; i--) {
1698                         if (flist->files[i]->basename)
1699                                 break;
1700                 }
1701                 flist->high = i;
1702         }
1703 }
1704
1705 static void output_flist(struct file_list *flist)
1706 {
1707         char uidbuf[16], gidbuf[16], depthbuf[16];
1708         struct file_struct *file;
1709         const char *who = who_am_i();
1710         int i;
1711
1712         for (i = 0; i < flist->count; i++) {
1713                 file = flist->files[i];
1714                 if ((am_root || am_sender) && preserve_uid)
1715                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1716                 else
1717                         *uidbuf = '\0';
1718                 if (preserve_gid && file->gid != GID_NONE)
1719                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1720                 else
1721                         *gidbuf = '\0';
1722                 if (!am_sender)
1723                         sprintf(depthbuf, "%d", file->dir.depth);
1724                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1725                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1726                         file->dirname ? file->dirname : "",
1727                         file->dirname ? "/" : "", NS(file->basename),
1728                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1729                         (double)file->length, uidbuf, gidbuf, file->flags);
1730         }
1731 }
1732
1733 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1734 enum fnc_type { t_PATH, t_ITEM };
1735
1736 /* Compare the names of two file_struct entities, similar to how strcmp()
1737  * would do if it were operating on the joined strings.
1738  *
1739  * Some differences beginning with protocol_version 29: (1) directory names
1740  * are compared with an assumed trailing slash so that they compare in a
1741  * way that would cause them to sort immediately prior to any content they
1742  * may have; (2) a directory of any name compares after a non-directory of
1743  * any name at the same depth; (3) a directory with name "." compares prior
1744  * to anything else.  These changes mean that a directory and a non-dir
1745  * with the same name will not compare as equal (protocol_version >= 29).
1746  *
1747  * The dirname component can be an empty string, but the basename component
1748  * cannot (and never is in the current codebase).  The basename component
1749  * may be NULL (for a removed item), in which case it is considered to be
1750  * after any existing item. */
1751 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1752 {
1753         int dif;
1754         const uchar *c1, *c2;
1755         enum fnc_state state1, state2;
1756         enum fnc_type type1, type2;
1757         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1758
1759         if (!f1 || !f1->basename) {
1760                 if (!f2 || !f2->basename)
1761                         return 0;
1762                 return -1;
1763         }
1764         if (!f2 || !f2->basename)
1765                 return 1;
1766
1767         c1 = (uchar*)f1->dirname;
1768         c2 = (uchar*)f2->dirname;
1769         if (c1 == c2)
1770                 c1 = c2 = NULL;
1771         if (!c1) {
1772                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1773                 c1 = (uchar*)f1->basename;
1774                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1775                         type1 = t_ITEM;
1776                         state1 = s_TRAILING;
1777                         c1 = (uchar*)"";
1778                 } else
1779                         state1 = s_BASE;
1780         } else if (!*c1) {
1781                 type1 = t_path;
1782                 state1 = s_SLASH;
1783                 c1 = (uchar*)"/";
1784         } else {
1785                 type1 = t_path;
1786                 state1 = s_DIR;
1787         }
1788         if (!c2) {
1789                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1790                 c2 = (uchar*)f2->basename;
1791                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1792                         type2 = t_ITEM;
1793                         state2 = s_TRAILING;
1794                         c2 = (uchar*)"";
1795                 } else
1796                         state2 = s_BASE;
1797         } else if (!*c2) {
1798                 type2 = t_path;
1799                 state2 = s_SLASH;
1800                 c2 = (uchar*)"/";
1801         } else {
1802                 type2 = t_path;
1803                 state2 = s_DIR;
1804         }
1805
1806         if (type1 != type2)
1807                 return type1 == t_PATH ? 1 : -1;
1808
1809         while (1) {
1810                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1811                         break;
1812                 if (!*c1) {
1813                         switch (state1) {
1814                         case s_DIR:
1815                                 state1 = s_SLASH;
1816                                 c1 = (uchar*)"/";
1817                                 break;
1818                         case s_SLASH:
1819                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1820                                 c1 = (uchar*)f1->basename;
1821                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1822                                         type1 = t_ITEM;
1823                                         state1 = s_TRAILING;
1824                                         c1 = (uchar*)"";
1825                                 } else
1826                                         state1 = s_BASE;
1827                                 break;
1828                         case s_BASE:
1829                                 state1 = s_TRAILING;
1830                                 if (type1 == t_PATH) {
1831                                         c1 = (uchar*)"/";
1832                                         break;
1833                                 }
1834                                 /* FALL THROUGH */
1835                         case s_TRAILING:
1836                                 type1 = t_ITEM;
1837                                 break;
1838                         }
1839                         if (*c2 && type1 != type2)
1840                                 return type1 == t_PATH ? 1 : -1;
1841                 }
1842                 if (!*c2) {
1843                         switch (state2) {
1844                         case s_DIR:
1845                                 state2 = s_SLASH;
1846                                 c2 = (uchar*)"/";
1847                                 break;
1848                         case s_SLASH:
1849                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1850                                 c2 = (uchar*)f2->basename;
1851                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1852                                         type2 = t_ITEM;
1853                                         state2 = s_TRAILING;
1854                                         c2 = (uchar*)"";
1855                                 } else
1856                                         state2 = s_BASE;
1857                                 break;
1858                         case s_BASE:
1859                                 state2 = s_TRAILING;
1860                                 if (type2 == t_PATH) {
1861                                         c2 = (uchar*)"/";
1862                                         break;
1863                                 }
1864                                 /* FALL THROUGH */
1865                         case s_TRAILING:
1866                                 if (!*c1)
1867                                         return 0;
1868                                 type2 = t_ITEM;
1869                                 break;
1870                         }
1871                         if (type1 != type2)
1872                                 return type1 == t_PATH ? 1 : -1;
1873                 }
1874         }
1875
1876         return dif;
1877 }
1878
1879 /* Return a copy of the full filename of a flist entry, using the indicated
1880  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1881  * done because we checked the size when creating the file_struct entry.
1882  */
1883 char *f_name(struct file_struct *f, char *fbuf)
1884 {
1885         if (!f || !f->basename)
1886                 return NULL;
1887
1888         if (!fbuf) {
1889                 static char names[5][MAXPATHLEN];
1890                 static unsigned int n;
1891
1892                 n = (n + 1) % (sizeof names / sizeof names[0]);
1893
1894                 fbuf = names[n];
1895         }
1896
1897         if (f->dirname) {
1898                 int len = strlen(f->dirname);
1899                 memcpy(fbuf, f->dirname, len);
1900                 fbuf[len] = '/';
1901                 strcpy(fbuf + len + 1, f->basename);
1902         } else
1903                 strcpy(fbuf, f->basename);
1904
1905         return fbuf;
1906 }
1907
1908 /* Do a non-recursive scan of the named directory, possibly ignoring all
1909  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1910  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1911  * buffer (the functions we call will append names onto the end, but the old
1912  * dir value will be restored on exit). */
1913 struct file_list *get_dirlist(char *dirname, int dlen,
1914                               int ignore_filter_rules)
1915 {
1916         struct file_list *dirlist;
1917         char dirbuf[MAXPATHLEN];
1918         int save_recurse = recurse;
1919
1920         if (dlen < 0) {
1921                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1922                 if (dlen >= MAXPATHLEN)
1923                         return NULL;
1924                 dirname = dirbuf;
1925         }
1926
1927         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1928
1929         recurse = 0;
1930         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1931         recurse = save_recurse;
1932         if (do_progress)
1933                 flist_count_offset += dirlist->count;
1934
1935         clean_flist(dirlist, 0, 0);
1936
1937         if (verbose > 3)
1938                 output_flist(dirlist);
1939
1940         return dirlist;
1941 }