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 const char *io_write_phase;
  61 extern struct stats stats;
  62 extern struct file_list *the_file_list;
  63
  64 extern char curr_dir[MAXPATHLEN];
  65
  66 extern struct chmod_mode_struct *chmod_modes;
  67
  68 extern struct filter_list_struct filter_list;
  69 extern struct filter_list_struct server_filter_list;
  70
  71 int io_error;
  72 int checksum_len;
  73 dev_t filesystem_dev; /* used to implement -x */
  74 unsigned int file_struct_len;
  75
  76 static char empty_sum[MD4_SUM_LENGTH];
  77 static int flist_count_offset;
  78
  79 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  80 static void output_flist(struct file_list *flist);
  81
  82 void init_flist(void)
  83 {
  84         struct file_struct f;
  85
  86         /* Figure out how big the file_struct is without trailing padding */
  87         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  88         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
  89 }
  90
  91 static int show_filelist_p(void)
  92 {
  93         return verbose && xfer_dirs && !am_server;
  94 }
  95
  96 static void start_filelist_progress(char *kind)
  97 {
  98         rprintf(FINFO, "%s ... ", kind);
  99         if (verbose > 1 || do_progress)
 100                 rprintf(FINFO, "\n");
 101         rflush(FINFO);
 102 }
 103
 104 static void emit_filelist_progress(int count)
 105 {
 106         rprintf(FINFO, " %d files...\r", count);
 107 }
 108
 109 static void maybe_emit_filelist_progress(int count)
 110 {
 111         if (do_progress && show_filelist_p() && (count % 100) == 0)
 112                 emit_filelist_progress(count);
 113 }
 114
 115 static void finish_filelist_progress(const struct file_list *flist)
 116 {
 117         if (do_progress) {
 118                 /* This overwrites the progress line */
 119                 rprintf(FINFO, "%d file%sto consider\n",
 120                         flist->count, flist->count == 1 ? " " : "s ");
 121         } else
 122                 rprintf(FINFO, "done\n");
 123 }
 124
 125 void show_flist_stats(void)
 126 {
 127         /* Nothing yet */
 128 }
 129
 130 static void list_file_entry(struct file_struct *f)
 131 {
 132         char permbuf[PERMSTRING_SIZE];
 133
 134         if (!f->basename) {
 135                 /* this can happen if duplicate names were removed */
 136                 return;
 137         }
 138
 139         permstring(permbuf, f->mode);
 140
 141 #ifdef SUPPORT_LINKS
 142         if (preserve_links && S_ISLNK(f->mode)) {
 143                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 144                         permbuf,
 145                         (double)f->length, timestring(f->modtime),
 146                         f_name(f, NULL), f->u.link);
 147         } else
 148 #endif
 149         {
 150                 rprintf(FINFO, "%s %11.0f %s %s\n",
 151                         permbuf,
 152                         (double)f->length, timestring(f->modtime),
 153                         f_name(f, NULL));
 154         }
 155 }
 156
 157 /**
 158  * Stat either a symlink or its referent, depending on the settings of
 159  * copy_links, copy_unsafe_links, etc.
 160  *
 161  * @retval -1 on error
 162  *
 163  * @retval 0 for success
 164  *
 165  * @post If @p path is a symlink, then @p linkbuf (of size @c
 166  * MAXPATHLEN) contains the symlink target.
 167  *
 168  * @post @p buffer contains information about the link or the
 169  * referrent as appropriate, if they exist.
 170  **/
 171 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 172 {
 173 #ifdef SUPPORT_LINKS
 174         if (copy_links)
 175                 return do_stat(path, buffer);
 176         if (link_stat(path, buffer, copy_dirlinks) < 0)
 177                 return -1;
 178         if (S_ISLNK(buffer->st_mode)) {
 179                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 180                 if (l == -1)
 181                         return -1;
 182                 linkbuf[l] = 0;
 183                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 184                         if (verbose > 1) {
 185                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 186                                         path, linkbuf);
 187                         }
 188                         return do_stat(path, buffer);
 189                 }
 190         }
 191         return 0;
 192 #else
 193         return do_stat(path, buffer);
 194 #endif
 195 }
 196
 197 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 198 {
 199 #ifdef SUPPORT_LINKS
 200         if (copy_links)
 201                 return do_stat(path, buffer);
 202         if (do_lstat(path, buffer) < 0)
 203                 return -1;
 204         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 205                 STRUCT_STAT st;
 206                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 207                         *buffer = st;
 208         }
 209         return 0;
 210 #else
 211         return do_stat(path, buffer);
 212 #endif
 213 }
 214
 215 /* This function is used to check if a file should be included/excluded
 216  * from the list of files based on its name and type etc.  The value of
 217  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 218 static int is_excluded(char *fname, int is_dir, int filter_level)
 219 {
 220 #if 0 /* This currently never happens, so avoid a useless compare. */
 221         if (filter_level == NO_FILTERS)
 222                 return 0;
 223 #endif
 224         if (fname) {
 225                 /* never exclude '.', even if somebody does --exclude '*' */
 226                 if (fname[0] == '.' && !fname[1])
 227                         return 0;
 228                 /* Handle the -R version of the '.' dir. */
 229                 if (fname[0] == '/') {
 230                         int len = strlen(fname);
 231                         if (fname[len-1] == '.' && fname[len-2] == '/')
 232                                 return 0;
 233                 }
 234         }
 235         if (server_filter_list.head
 236             && check_filter(&server_filter_list, fname, is_dir) < 0)
 237                 return 1;
 238         if (filter_level != ALL_FILTERS)
 239                 return 0;
 240         if (filter_list.head
 241             && check_filter(&filter_list, fname, is_dir) < 0)
 242                 return 1;
 243         return 0;
 244 }
 245
 246 static int to_wire_mode(mode_t mode)
 247 {
 248 #ifdef SUPPORT_LINKS
 249         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 250                 return (mode & ~(_S_IFMT)) | 0120000;
 251 #endif
 252         return (int)mode;
 253 }
 254
 255 static mode_t from_wire_mode(int mode)
 256 {
 257         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 258                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 259         return (mode_t)mode;
 260 }
 261
 262 static void send_directory(int f, struct file_list *flist,
 263                            char *fbuf, int len);
 264
 265 static char *flist_dir;
 266 static int flist_dir_len;
 267
 268
 269 /**
 270  * Make sure @p flist is big enough to hold at least @p flist->count
 271  * entries.
 272  **/
 273 void flist_expand(struct file_list *flist)
 274 {
 275         struct file_struct **new_ptr;
 276
 277         if (flist->count < flist->malloced)
 278                 return;
 279
 280         if (flist->malloced < FLIST_START)
 281                 flist->malloced = FLIST_START;
 282         else if (flist->malloced >= FLIST_LINEAR)
 283                 flist->malloced += FLIST_LINEAR;
 284         else
 285                 flist->malloced *= 2;
 286
 287         /*
 288          * In case count jumped or we are starting the list
 289          * with a known size just set it.
 290          */
 291         if (flist->malloced < flist->count)
 292                 flist->malloced = flist->count;
 293
 294         new_ptr = realloc_array(flist->files, struct file_struct *,
 295                                 flist->malloced);
 296
 297         if (verbose >= 2 && flist->malloced != FLIST_START) {
 298                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 299                     who_am_i(),
 300                     (double)sizeof flist->files[0] * flist->malloced,
 301                     (new_ptr == flist->files) ? " not" : "");
 302         }
 303
 304         flist->files = new_ptr;
 305
 306         if (!flist->files)
 307                 out_of_memory("flist_expand");
 308 }
 309
 310 static void send_file_entry(struct file_struct *file, int f)
 311 {
 312         unsigned short flags;
 313         static time_t modtime;
 314         static mode_t mode;
 315         static int64 dev;
 316         static dev_t rdev;
 317         static uint32 rdev_major;
 318         static uid_t uid;
 319         static gid_t gid;
 320         static char lastname[MAXPATHLEN];
 321         char fname[MAXPATHLEN];
 322         int l1, l2;
 323
 324         if (f < 0)
 325                 return;
 326
 327         if (!file) {
 328                 write_byte(f, 0);
 329                 modtime = 0, mode = 0;
 330                 dev = 0, rdev = makedev(0, 0);
 331                 rdev_major = 0;
 332                 uid = 0, gid = 0;
 333                 *lastname = '\0';
 334                 return;
 335         }
 336
 337         io_write_phase = "send_file_entry";
 338
 339         f_name(file, fname);
 340
 341         flags = file->flags & XMIT_TOP_DIR;
 342
 343         if (file->mode == mode)
 344                 flags |= XMIT_SAME_MODE;
 345         else
 346                 mode = file->mode;
 347         if ((preserve_devices && IS_DEVICE(mode))
 348          || (preserve_specials && IS_SPECIAL(mode))) {
 349                 if (protocol_version < 28) {
 350                         if (file->u.rdev == rdev)
 351                                 flags |= XMIT_SAME_RDEV_pre28;
 352                         else
 353                                 rdev = file->u.rdev;
 354                 } else {
 355                         rdev = file->u.rdev;
 356                         if ((uint32)major(rdev) == rdev_major)
 357                                 flags |= XMIT_SAME_RDEV_MAJOR;
 358                         else
 359                                 rdev_major = major(rdev);
 360                         if ((uint32)minor(rdev) <= 0xFFu)
 361                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 362                 }
 363         } else if (protocol_version < 28)
 364                 rdev = makedev(0, 0);
 365         if (file->uid == uid)
 366                 flags |= XMIT_SAME_UID;
 367         else
 368                 uid = file->uid;
 369         if (file->gid == gid)
 370                 flags |= XMIT_SAME_GID;
 371         else
 372                 gid = file->gid;
 373         if (file->modtime == modtime)
 374                 flags |= XMIT_SAME_TIME;
 375         else
 376                 modtime = file->modtime;
 377
 378 #ifdef SUPPORT_HARD_LINKS
 379         if (file->link_u.idev) {
 380                 if (file->F_DEV == dev) {
 381                         if (protocol_version >= 28)
 382                                 flags |= XMIT_SAME_DEV;
 383                 } else
 384                         dev = file->F_DEV;
 385                 flags |= XMIT_HAS_IDEV_DATA;
 386         }
 387 #endif
 388
 389         for (l1 = 0;
 390             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 391             l1++) {}
 392         l2 = strlen(fname+l1);
 393
 394         if (l1 > 0)
 395                 flags |= XMIT_SAME_NAME;
 396         if (l2 > 255)
 397                 flags |= XMIT_LONG_NAME;
 398
 399         /* We must make sure we don't send a zero flag byte or the
 400          * other end will terminate the flist transfer.  Note that
 401          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 402          * it's harmless way to add a bit to the first flag byte. */
 403         if (protocol_version >= 28) {
 404                 if (!flags && !S_ISDIR(mode))
 405                         flags |= XMIT_TOP_DIR;
 406                 if ((flags & 0xFF00) || !flags) {
 407                         flags |= XMIT_EXTENDED_FLAGS;
 408                         write_byte(f, flags);
 409                         write_byte(f, flags >> 8);
 410                 } else
 411                         write_byte(f, flags);
 412         } else {
 413                 if (!(flags & 0xFF))
 414                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 415                 write_byte(f, flags);
 416         }
 417         if (flags & XMIT_SAME_NAME)
 418                 write_byte(f, l1);
 419         if (flags & XMIT_LONG_NAME)
 420                 write_int(f, l2);
 421         else
 422                 write_byte(f, l2);
 423         write_buf(f, fname + l1, l2);
 424
 425         write_longint(f, file->length);
 426         if (!(flags & XMIT_SAME_TIME))
 427                 write_int(f, modtime);
 428         if (!(flags & XMIT_SAME_MODE))
 429                 write_int(f, to_wire_mode(mode));
 430         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 431                 if (!numeric_ids)
 432                         add_uid(uid);
 433                 write_int(f, uid);
 434         }
 435         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 436                 if (!numeric_ids)
 437                         add_gid(gid);
 438                 write_int(f, gid);
 439         }
 440         if ((preserve_devices && IS_DEVICE(mode))
 441          || (preserve_specials && IS_SPECIAL(mode))) {
 442                 if (protocol_version < 28) {
 443                         if (!(flags & XMIT_SAME_RDEV_pre28))
 444                                 write_int(f, (int)rdev);
 445                 } else {
 446                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 447                                 write_int(f, major(rdev));
 448                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 449                                 write_byte(f, minor(rdev));
 450                         else
 451                                 write_int(f, minor(rdev));
 452                 }
 453         }
 454
 455 #ifdef SUPPORT_LINKS
 456         if (preserve_links && S_ISLNK(mode)) {
 457                 int len = strlen(file->u.link);
 458                 write_int(f, len);
 459                 write_buf(f, file->u.link, len);
 460         }
 461 #endif
 462
 463 #ifdef SUPPORT_HARD_LINKS
 464         if (flags & XMIT_HAS_IDEV_DATA) {
 465                 if (protocol_version < 26) {
 466                         /* 32-bit dev_t and ino_t */
 467                         write_int(f, dev);
 468                         write_int(f, file->F_INODE);
 469                 } else {
 470                         /* 64-bit dev_t and ino_t */
 471                         if (!(flags & XMIT_SAME_DEV))
 472                                 write_longint(f, dev);
 473                         write_longint(f, file->F_INODE);
 474                 }
 475         }
 476 #endif
 477
 478         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 479                 char *sum;
 480                 if (S_ISREG(mode))
 481                         sum = file->u.sum;
 482                 else {
 483                         /* Prior to 28, we sent a useless set of nulls. */
 484                         sum = empty_sum;
 485                 }
 486                 write_buf(f, sum, checksum_len);
 487         }
 488
 489         strlcpy(lastname, fname, MAXPATHLEN);
 490
 491         io_write_phase = "unknown";
 492 }
 493
 494 static struct file_struct *receive_file_entry(struct file_list *flist,
 495                                               unsigned short flags, int f)
 496 {
 497         static time_t modtime;
 498         static mode_t mode;
 499         static int64 dev;
 500         static dev_t rdev;
 501         static uint32 rdev_major;
 502         static uid_t uid;
 503         static gid_t gid;
 504         static char lastname[MAXPATHLEN], *lastdir;
 505         static int lastdir_depth, lastdir_len = -1;
 506         static unsigned int del_hier_name_len = 0;
 507         static int in_del_hier = 0;
 508         char thisname[MAXPATHLEN];
 509         unsigned int l1 = 0, l2 = 0;
 510         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 511         OFF_T file_length;
 512         char *basename, *dirname, *bp;
 513         struct file_struct *file;
 514
 515         if (!flist) {
 516                 modtime = 0, mode = 0;
 517                 dev = 0, rdev = makedev(0, 0);
 518                 rdev_major = 0;
 519                 uid = 0, gid = 0;
 520                 *lastname = '\0';
 521                 lastdir_len = -1;
 522                 in_del_hier = 0;
 523                 return NULL;
 524         }
 525
 526         if (flags & XMIT_SAME_NAME)
 527                 l1 = read_byte(f);
 528
 529         if (flags & XMIT_LONG_NAME)
 530                 l2 = read_int(f);
 531         else
 532                 l2 = read_byte(f);
 533
 534         if (l2 >= MAXPATHLEN - l1) {
 535                 rprintf(FERROR,
 536                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 537                         flags, l1, l2, lastname);
 538                 overflow_exit("receive_file_entry");
 539         }
 540
 541         strlcpy(thisname, lastname, l1 + 1);
 542         read_sbuf(f, &thisname[l1], l2);
 543         thisname[l1 + l2] = 0;
 544
 545         strlcpy(lastname, thisname, MAXPATHLEN);
 546
 547         clean_fname(thisname, 0);
 548
 549         if (sanitize_paths)
 550                 sanitize_path(thisname, thisname, "", 0);
 551
 552         if ((basename = strrchr(thisname, '/')) != NULL) {
 553                 dirname_len = ++basename - thisname; /* counts future '\0' */
 554                 if (lastdir_len == dirname_len - 1
 555                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 556                         dirname = lastdir;
 557                         dirname_len = 0; /* indicates no copy is needed */
 558                 } else
 559                         dirname = thisname;
 560         } else {
 561                 basename = thisname;
 562                 dirname = NULL;
 563                 dirname_len = 0;
 564         }
 565         basename_len = strlen(basename) + 1; /* count the '\0' */
 566
 567         file_length = read_longint(f);
 568         if (!(flags & XMIT_SAME_TIME))
 569                 modtime = (time_t)read_int(f);
 570         if (!(flags & XMIT_SAME_MODE))
 571                 mode = from_wire_mode(read_int(f));
 572
 573         if (chmod_modes && !S_ISLNK(mode))
 574                 mode = tweak_mode(mode, chmod_modes);
 575
 576         if (preserve_uid && !(flags & XMIT_SAME_UID))
 577                 uid = (uid_t)read_int(f);
 578         if (preserve_gid && !(flags & XMIT_SAME_GID))
 579                 gid = (gid_t)read_int(f);
 580
 581         if ((preserve_devices && IS_DEVICE(mode))
 582          || (preserve_specials && IS_SPECIAL(mode))) {
 583                 if (protocol_version < 28) {
 584                         if (!(flags & XMIT_SAME_RDEV_pre28))
 585                                 rdev = (dev_t)read_int(f);
 586                 } else {
 587                         uint32 rdev_minor;
 588                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 589                                 rdev_major = read_int(f);
 590                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 591                                 rdev_minor = read_byte(f);
 592                         else
 593                                 rdev_minor = read_int(f);
 594                         rdev = makedev(rdev_major, rdev_minor);
 595                 }
 596         } else if (protocol_version < 28)
 597                 rdev = makedev(0, 0);
 598
 599 #ifdef SUPPORT_LINKS
 600         if (preserve_links && S_ISLNK(mode)) {
 601                 linkname_len = read_int(f) + 1; /* count the '\0' */
 602                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 603                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 604                                 linkname_len - 1);
 605                         overflow_exit("receive_file_entry");
 606                 }
 607         }
 608         else
 609 #endif
 610                 linkname_len = 0;
 611
 612         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 613
 614         alloc_len = file_struct_len + dirname_len + basename_len
 615                   + linkname_len + sum_len;
 616         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 617
 618         file = (struct file_struct *)bp;
 619         memset(bp, 0, file_struct_len);
 620         bp += file_struct_len;
 621
 622         file->modtime = modtime;
 623         file->length = file_length;
 624         file->mode = mode;
 625         file->uid = uid;
 626         file->gid = gid;
 627
 628         if (dirname_len) {
 629                 file->dirname = lastdir = bp;
 630                 lastdir_len = dirname_len - 1;
 631                 memcpy(bp, dirname, dirname_len - 1);
 632                 bp += dirname_len;
 633                 bp[-1] = '\0';
 634                 lastdir_depth = count_dir_elements(lastdir);
 635                 file->dir.depth = lastdir_depth + 1;
 636         } else if (dirname) {
 637                 file->dirname = dirname; /* we're reusing lastname */
 638                 file->dir.depth = lastdir_depth + 1;
 639         } else
 640                 file->dir.depth = 1;
 641
 642         if (S_ISDIR(mode)) {
 643                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 644                         file->dir.depth--;
 645                 if (flags & XMIT_TOP_DIR) {
 646                         in_del_hier = recurse;
 647                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 648                         if (relative_paths && del_hier_name_len > 2
 649                             && lastname[del_hier_name_len-1] == '.'
 650                             && lastname[del_hier_name_len-2] == '/')
 651                                 del_hier_name_len -= 2;
 652                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 653                 } else if (in_del_hier) {
 654                         if (!relative_paths || !del_hier_name_len
 655                          || (l1 >= del_hier_name_len
 656                           && lastname[del_hier_name_len] == '/'))
 657                                 file->flags |= FLAG_DEL_HERE;
 658                         else
 659                                 in_del_hier = 0;
 660                 }
 661         }
 662
 663         file->basename = bp;
 664         memcpy(bp, basename, basename_len);
 665         bp += basename_len;
 666
 667         if ((preserve_devices && IS_DEVICE(mode))
 668          || (preserve_specials && IS_SPECIAL(mode)))
 669                 file->u.rdev = rdev;
 670
 671 #ifdef SUPPORT_LINKS
 672         if (linkname_len) {
 673                 file->u.link = bp;
 674                 read_sbuf(f, bp, linkname_len - 1);
 675                 if (sanitize_paths)
 676                         sanitize_path(bp, bp, "", lastdir_depth);
 677                 bp += linkname_len;
 678         }
 679 #endif
 680
 681 #ifdef SUPPORT_HARD_LINKS
 682         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 683                 flags |= XMIT_HAS_IDEV_DATA;
 684         if (flags & XMIT_HAS_IDEV_DATA) {
 685                 int64 inode;
 686                 if (protocol_version < 26) {
 687                         dev = read_int(f);
 688                         inode = read_int(f);
 689                 } else {
 690                         if (!(flags & XMIT_SAME_DEV))
 691                                 dev = read_longint(f);
 692                         inode = read_longint(f);
 693                 }
 694                 if (flist->hlink_pool) {
 695                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 696                             struct idev, 1, "inode_table");
 697                         file->F_INODE = inode;
 698                         file->F_DEV = dev;
 699                 }
 700         }
 701 #endif
 702
 703         if (always_checksum && (sum_len || protocol_version < 28)) {
 704                 char *sum;
 705                 if (sum_len) {
 706                         file->u.sum = sum = bp;
 707                         /*bp += sum_len;*/
 708                 } else {
 709                         /* Prior to 28, we get a useless set of nulls. */
 710                         sum = empty_sum;
 711                 }
 712                 read_buf(f, sum, checksum_len);
 713         }
 714
 715         return file;
 716 }
 717
 718 /**
 719  * Create a file_struct for a named file by reading its stat()
 720  * information and performing extensive checks against global
 721  * options.
 722  *
 723  * @return the new file, or NULL if there was an error or this file
 724  * should be excluded.
 725  *
 726  * @todo There is a small optimization opportunity here to avoid
 727  * stat()ing the file in some circumstances, which has a certain cost.
 728  * We are called immediately after doing readdir(), and so we may
 729  * already know the d_type of the file.  We could for example avoid
 730  * statting directories if we're not recursing, but this is not a very
 731  * important case.  Some systems may not have d_type.
 732  **/
 733 struct file_struct *make_file(char *fname, struct file_list *flist,
 734                               STRUCT_STAT *stp, unsigned short flags,
 735                               int filter_level)
 736 {
 737         static char *lastdir;
 738         static int lastdir_len = -1;
 739         struct file_struct *file;
 740         STRUCT_STAT st;
 741         char sum[SUM_LENGTH];
 742         char thisname[MAXPATHLEN];
 743         char linkname[MAXPATHLEN];
 744         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 745         char *basename, *dirname, *bp;
 746
 747         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 748                 lastdir_len = -1;
 749
 750         if (strlcpy(thisname, fname, sizeof thisname)
 751             >= sizeof thisname - flist_dir_len) {
 752                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 753                 return NULL;
 754         }
 755         clean_fname(thisname, 0);
 756         if (sanitize_paths)
 757                 sanitize_path(thisname, thisname, "", 0);
 758
 759         memset(sum, 0, SUM_LENGTH);
 760
 761         if (stp && S_ISDIR(stp->st_mode))
 762                 st = *stp; /* Needed for "symlink/." with --relative. */
 763         else if (readlink_stat(thisname, &st, linkname) != 0) {
 764                 int save_errno = errno;
 765                 /* See if file is excluded before reporting an error. */
 766                 if (filter_level != NO_FILTERS
 767                     && is_excluded(thisname, 0, filter_level))
 768                         return NULL;
 769                 if (save_errno == ENOENT) {
 770 #ifdef SUPPORT_LINKS
 771                         /* Avoid "vanished" error if symlink points nowhere. */
 772                         if (copy_links && do_lstat(thisname, &st) == 0
 773                             && S_ISLNK(st.st_mode)) {
 774                                 io_error |= IOERR_GENERAL;
 775                                 rprintf(FERROR, "symlink has no referent: %s\n",
 776                                         full_fname(thisname));
 777                         } else
 778 #endif
 779                         {
 780                                 enum logcode c = am_daemon && protocol_version < 28
 781                                     ? FERROR : FINFO;
 782                                 io_error |= IOERR_VANISHED;
 783                                 rprintf(c, "file has vanished: %s\n",
 784                                         full_fname(thisname));
 785                         }
 786                 } else {
 787                         io_error |= IOERR_GENERAL;
 788                         rsyserr(FERROR, save_errno, "readlink %s failed",
 789                                 full_fname(thisname));
 790                 }
 791                 return NULL;
 792         }
 793
 794         /* backup.c calls us with filter_level set to NO_FILTERS. */
 795         if (filter_level == NO_FILTERS)
 796                 goto skip_filters;
 797
 798         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 799                 rprintf(FINFO, "skipping directory %s\n", thisname);
 800                 return NULL;
 801         }
 802
 803         /* We only care about directories because we need to avoid recursing
 804          * into a mount-point directory, not to avoid copying a symlinked
 805          * file if -L (or similar) was specified. */
 806         if (one_file_system && st.st_dev != filesystem_dev
 807          && S_ISDIR(st.st_mode)) {
 808                 if (one_file_system > 1) {
 809                         if (verbose > 2) {
 810                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 811                                         thisname);
 812                         }
 813                         return NULL;
 814                 }
 815                 flags |= FLAG_MOUNT_POINT;
 816         }
 817
 818         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 819                 return NULL;
 820
 821         if (lp_ignore_nonreadable(module_id)) {
 822 #ifdef SUPPORT_LINKS
 823                 if (!S_ISLNK(st.st_mode))
 824 #endif
 825                         if (access(thisname, R_OK) != 0)
 826                                 return NULL;
 827         }
 828
 829   skip_filters:
 830
 831         if (verbose > 2) {
 832                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 833                         who_am_i(), thisname, filter_level);
 834         }
 835
 836         if ((basename = strrchr(thisname, '/')) != NULL) {
 837                 dirname_len = ++basename - thisname; /* counts future '\0' */
 838                 if (lastdir_len == dirname_len - 1
 839                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 840                         dirname = lastdir;
 841                         dirname_len = 0; /* indicates no copy is needed */
 842                 } else
 843                         dirname = thisname;
 844         } else {
 845                 basename = thisname;
 846                 dirname = NULL;
 847                 dirname_len = 0;
 848         }
 849         basename_len = strlen(basename) + 1; /* count the '\0' */
 850
 851 #ifdef SUPPORT_LINKS
 852         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 853 #else
 854         linkname_len = 0;
 855 #endif
 856
 857         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 858                 ? MD4_SUM_LENGTH : 0;
 859
 860         alloc_len = file_struct_len + dirname_len + basename_len
 861             + linkname_len + sum_len;
 862         if (flist)
 863                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 864         else {
 865                 if (!(bp = new_array(char, alloc_len)))
 866                         out_of_memory("make_file");
 867         }
 868
 869         file = (struct file_struct *)bp;
 870         memset(bp, 0, file_struct_len);
 871         bp += file_struct_len;
 872
 873         file->flags = flags;
 874         file->modtime = st.st_mtime;
 875         file->length = st.st_size;
 876         file->mode = st.st_mode;
 877         file->uid = st.st_uid;
 878         file->gid = st.st_gid;
 879
 880 #ifdef SUPPORT_HARD_LINKS
 881         if (flist && flist->hlink_pool) {
 882                 if (protocol_version < 28) {
 883                         if (S_ISREG(st.st_mode))
 884                                 file->link_u.idev = pool_talloc(
 885                                     flist->hlink_pool, struct idev, 1,
 886                                     "inode_table");
 887                 } else {
 888                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 889                                 file->link_u.idev = pool_talloc(
 890                                     flist->hlink_pool, struct idev, 1,
 891                                     "inode_table");
 892                 }
 893         }
 894         if (file->link_u.idev) {
 895                 file->F_DEV = st.st_dev;
 896                 file->F_INODE = st.st_ino;
 897         }
 898 #endif
 899
 900         if (dirname_len) {
 901                 file->dirname = lastdir = bp;
 902                 lastdir_len = dirname_len - 1;
 903                 memcpy(bp, dirname, dirname_len - 1);
 904                 bp += dirname_len;
 905                 bp[-1] = '\0';
 906         } else if (dirname)
 907                 file->dirname = dirname;
 908
 909         file->basename = bp;
 910         memcpy(bp, basename, basename_len);
 911         bp += basename_len;
 912
 913 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 914         if ((preserve_devices && IS_DEVICE(st.st_mode))
 915          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 916                 file->u.rdev = st.st_rdev;
 917 #endif
 918
 919 #ifdef SUPPORT_LINKS
 920         if (linkname_len) {
 921                 file->u.link = bp;
 922                 memcpy(bp, linkname, linkname_len);
 923                 bp += linkname_len;
 924         }
 925 #endif
 926
 927         if (sum_len) {
 928                 file->u.sum = bp;
 929                 file_checksum(thisname, bp, st.st_size);
 930                 /*bp += sum_len;*/
 931         }
 932
 933         file->dir.root = flist_dir;
 934
 935         /* This code is only used by the receiver when it is building
 936          * a list of files for a delete pass. */
 937         if (keep_dirlinks && linkname_len && flist) {
 938                 STRUCT_STAT st2;
 939                 int save_mode = file->mode;
 940                 file->mode = S_IFDIR; /* Find a directory with our name. */
 941                 if (flist_find(the_file_list, file) >= 0
 942                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 943                         file->modtime = st2.st_mtime;
 944                         file->length = st2.st_size;
 945                         file->mode = st2.st_mode;
 946                         file->uid = st2.st_uid;
 947                         file->gid = st2.st_gid;
 948                         file->u.link = NULL;
 949                 } else
 950                         file->mode = save_mode;
 951         }
 952
 953         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 954                 stats.total_size += st.st_size;
 955
 956         return file;
 957 }
 958
 959 static struct file_struct *send_file_name(int f, struct file_list *flist,
 960                                           char *fname, STRUCT_STAT *stp,
 961                                           unsigned short flags)
 962 {
 963         struct file_struct *file;
 964
 965         file = make_file(fname, flist, stp, flags,
 966                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 967         if (!file)
 968                 return NULL;
 969
 970         if (chmod_modes && !S_ISLNK(file->mode))
 971                 file->mode = tweak_mode(file->mode, chmod_modes);
 972
 973         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 974
 975         flist_expand(flist);
 976
 977         if (file->basename[0]) {
 978                 flist->files[flist->count++] = file;
 979                 send_file_entry(file, f);
 980         }
 981         return file;
 982 }
 983
 984 static void send_if_directory(int f, struct file_list *flist,
 985                               struct file_struct *file,
 986                               char *fbuf, unsigned int ol)
 987 {
 988         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 989
 990         if (S_ISDIR(file->mode)
 991             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 992                 void *save_filters;
 993                 unsigned int len = strlen(fbuf);
 994                 if (len > 1 && fbuf[len-1] == '/')
 995                         fbuf[--len] = '\0';
 996                 if (len >= MAXPATHLEN - 1) {
 997                         io_error |= IOERR_GENERAL;
 998                         rprintf(FERROR, "skipping long-named directory: %s\n",
 999                                 full_fname(fbuf));
1000                         return;
1001                 }
1002                 save_filters = push_local_filters(fbuf, len);
1003                 send_directory(f, flist, fbuf, len);
1004                 pop_local_filters(save_filters);
1005                 fbuf[ol] = '\0';
1006                 if (is_dot_dir)
1007                         fbuf[ol-1] = '.';
1008         }
1009 }
1010
1011 /* This function is normally called by the sender, but the receiving side also
1012  * calls it from get_dirlist() with f set to -1 so that we just construct the
1013  * file list in memory without sending it over the wire.  Also, get_dirlist()
1014  * might call this with f set to -2, which also indicates that local filter
1015  * rules should be ignored. */
1016 static void send_directory(int f, struct file_list *flist,
1017                            char *fbuf, int len)
1018 {
1019         struct dirent *di;
1020         unsigned remainder;
1021         char *p;
1022         DIR *d;
1023         int start = flist->count;
1024
1025         if (!(d = opendir(fbuf))) {
1026                 io_error |= IOERR_GENERAL;
1027                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1028                 return;
1029         }
1030
1031         p = fbuf + len;
1032         if (len != 1 || *fbuf != '/')
1033                 *p++ = '/';
1034         *p = '\0';
1035         remainder = MAXPATHLEN - (p - fbuf);
1036
1037         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1038                 char *dname = d_name(di);
1039                 if (dname[0] == '.' && (dname[1] == '\0'
1040                     || (dname[1] == '.' && dname[2] == '\0')))
1041                         continue;
1042                 if (strlcpy(p, dname, remainder) >= remainder) {
1043                         io_error |= IOERR_GENERAL;
1044                         rprintf(FINFO,
1045                                 "cannot send long-named file %s\n",
1046                                 full_fname(fbuf));
1047                         continue;
1048                 }
1049
1050                 send_file_name(f, flist, fbuf, NULL, 0);
1051         }
1052
1053         fbuf[len] = '\0';
1054
1055         if (errno) {
1056                 io_error |= IOERR_GENERAL;
1057                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1058         }
1059
1060         closedir(d);
1061
1062         if (recurse) {
1063                 int i, end = flist->count - 1;
1064                 for (i = start; i <= end; i++)
1065                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1066         }
1067 }
1068
1069 struct file_list *send_file_list(int f, int argc, char *argv[])
1070 {
1071         int len;
1072         STRUCT_STAT st;
1073         char *p, *dir, olddir[sizeof curr_dir];
1074         char lastpath[MAXPATHLEN] = "";
1075         struct file_list *flist;
1076         struct timeval start_tv, end_tv;
1077         int64 start_write;
1078         int use_ff_fd = 0;
1079
1080         if (show_filelist_p())
1081                 start_filelist_progress("building file list");
1082
1083         start_write = stats.total_written;
1084         gettimeofday(&start_tv, NULL);
1085
1086         flist = flist_new(WITH_HLINK, "send_file_list");
1087
1088         io_start_buffering_out();
1089         if (filesfrom_fd >= 0) {
1090                 if (argv[0] && !push_dir(argv[0])) {
1091                         rsyserr(FERROR, errno, "push_dir %s failed",
1092                                 full_fname(argv[0]));
1093                         exit_cleanup(RERR_FILESELECT);
1094                 }
1095                 use_ff_fd = 1;
1096         }
1097
1098         while (1) {
1099                 char fbuf[MAXPATHLEN];
1100                 char *fn;
1101                 int is_dot_dir;
1102
1103                 if (use_ff_fd) {
1104                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1105                                 break;
1106                         sanitize_path(fbuf, fbuf, "", 0);
1107                 } else {
1108                         if (argc-- == 0)
1109                                 break;
1110                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1111                         if (sanitize_paths)
1112                                 sanitize_path(fbuf, fbuf, "", 0);
1113                 }
1114
1115                 len = strlen(fbuf);
1116                 if (relative_paths) {
1117                         /* We clean up fbuf below. */
1118                         is_dot_dir = 0;
1119                 } else if (!len || fbuf[len - 1] == '/') {
1120                         if (len == 2 && fbuf[0] == '.') {
1121                                 /* Turn "./" into just "." rather than "./." */
1122                                 fbuf[1] = '\0';
1123                         } else {
1124                                 if (len + 1 >= MAXPATHLEN)
1125                                         overflow_exit("send_file_list");
1126                                 fbuf[len++] = '.';
1127                                 fbuf[len] = '\0';
1128                         }
1129                         is_dot_dir = 1;
1130                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1131                     && (len == 2 || fbuf[len-3] == '/')) {
1132                         if (len + 2 >= MAXPATHLEN)
1133                                 overflow_exit("send_file_list");
1134                         fbuf[len++] = '/';
1135                         fbuf[len++] = '.';
1136                         fbuf[len] = '\0';
1137                         is_dot_dir = 1;
1138                 } else {
1139                         is_dot_dir = fbuf[len-1] == '.'
1140                                    && (len == 1 || fbuf[len-2] == '/');
1141                 }
1142
1143                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1144                         io_error |= IOERR_GENERAL;
1145                         rsyserr(FERROR, errno, "link_stat %s failed",
1146                                 full_fname(fbuf));
1147                         continue;
1148                 }
1149
1150                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1151                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1152                         continue;
1153                 }
1154
1155                 dir = NULL;
1156                 olddir[0] = '\0';
1157
1158                 if (!relative_paths) {
1159                         p = strrchr(fbuf, '/');
1160                         if (p) {
1161                                 *p = '\0';
1162                                 if (p == fbuf)
1163                                         dir = "/";
1164                                 else
1165                                         dir = fbuf;
1166                                 len -= p - fbuf + 1;
1167                                 fn = p + 1;
1168                         } else
1169                                 fn = fbuf;
1170                 } else {
1171                         if ((p = strstr(fbuf, "/./")) != NULL) {
1172                                 *p = '\0';
1173                                 if (p == fbuf)
1174                                         dir = "/";
1175                                 else
1176                                         dir = fbuf;
1177                                 len -= p - fbuf + 3;
1178                                 fn = p + 3;
1179                         } else
1180                                 fn = fbuf;
1181                         /* Get rid of trailing "/" and "/.". */
1182                         while (len) {
1183                                 if (fn[len - 1] == '/') {
1184                                         is_dot_dir = 1;
1185                                         if (!--len && !dir) {
1186                                                 len++;
1187                                                 break;
1188                                         }
1189                                 }
1190                                 else if (len >= 2 && fn[len - 1] == '.'
1191                                                   && fn[len - 2] == '/') {
1192                                         is_dot_dir = 1;
1193                                         if (!(len -= 2) && !dir) {
1194                                                 len++;
1195                                                 break;
1196                                         }
1197                                 } else
1198                                         break;
1199                         }
1200                         fn[len] = '\0';
1201                         /* Reject a ".." dir in the active part of the path. */
1202                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1203                                 if ((p[2] == '/' || p[2] == '\0')
1204                                  && (p == fn || p[-1] == '/')) {
1205                                         rprintf(FERROR,
1206                                             "found \"..\" dir in relative path: %s\n",
1207                                             fbuf);
1208                                         exit_cleanup(RERR_SYNTAX);
1209                                 }
1210                         }
1211                 }
1212
1213                 if (!*fn) {
1214                         len = 1;
1215                         fn = ".";
1216                 }
1217
1218                 if (dir && *dir) {
1219                         static char *lastdir;
1220                         static int lastdir_len;
1221
1222                         strlcpy(olddir, curr_dir, sizeof olddir);
1223
1224                         if (!push_dir(dir)) {
1225                                 io_error |= IOERR_GENERAL;
1226                                 rsyserr(FERROR, errno, "push_dir %s failed",
1227                                         full_fname(dir));
1228                                 continue;
1229                         }
1230
1231                         if (lastdir && strcmp(lastdir, dir) == 0) {
1232                                 flist_dir = lastdir;
1233                                 flist_dir_len = lastdir_len;
1234                         } else {
1235                                 flist_dir = lastdir = strdup(dir);
1236                                 flist_dir_len = lastdir_len = strlen(dir);
1237                         }
1238                 }
1239
1240                 if (fn != fbuf)
1241                         memmove(fbuf, fn, len + 1);
1242
1243                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1244                         /* Send the implied directories at the start of the
1245                          * source spec, so we get their permissions right. */
1246                         char *lp = lastpath, *slash = fbuf;
1247                         *p = '\0';
1248                         /* Skip any initial directories in our path that we
1249                          * have in common with lastpath. */
1250                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1251                                 if (*fn == '/')
1252                                         slash = fn;
1253                         }
1254                         *p = '/';
1255                         if (fn != p || (*lp && *lp != '/')) {
1256                                 int save_copy_links = copy_links;
1257                                 int save_xfer_dirs = xfer_dirs;
1258                                 copy_links |= copy_unsafe_links;
1259                                 xfer_dirs = 1;
1260                                 while ((slash = strchr(slash+1, '/')) != 0) {
1261                                         *slash = '\0';
1262                                         send_file_name(f, flist, fbuf, NULL, 0);
1263                                         *slash = '/';
1264                                 }
1265                                 copy_links = save_copy_links;
1266                                 xfer_dirs = save_xfer_dirs;
1267                                 *p = '\0';
1268                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1269                                 *p = '/';
1270                         }
1271                 }
1272
1273                 if (one_file_system)
1274                         filesystem_dev = st.st_dev;
1275
1276                 if (recurse || (xfer_dirs && is_dot_dir)) {
1277                         struct file_struct *file;
1278                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1279                         if (file)
1280                                 send_if_directory(f, flist, file, fbuf, len);
1281                 } else
1282                         send_file_name(f, flist, fbuf, &st, 0);
1283
1284                 if (olddir[0]) {
1285                         flist_dir = NULL;
1286                         flist_dir_len = 0;
1287                         if (!pop_dir(olddir)) {
1288                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1289                                         full_fname(olddir));
1290                                 exit_cleanup(RERR_FILESELECT);
1291                         }
1292                 }
1293         }
1294
1295         gettimeofday(&end_tv, NULL);
1296         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1297                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1298         if (stats.flist_buildtime == 0)
1299                 stats.flist_buildtime = 1;
1300         start_tv = end_tv;
1301
1302         send_file_entry(NULL, f);
1303
1304         if (show_filelist_p())
1305                 finish_filelist_progress(flist);
1306
1307         gettimeofday(&end_tv, NULL);
1308         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1309                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1310
1311         if (flist->hlink_pool) {
1312                 pool_destroy(flist->hlink_pool);
1313                 flist->hlink_pool = NULL;
1314         }
1315
1316         /* Sort the list without removing any duplicates.  This allows the
1317          * receiving side to ask for any name they like, which gives us the
1318          * flexibility to change the way we unduplicate names in the future
1319          * without causing a compatibility problem with older versions. */
1320         clean_flist(flist, 0, 0);
1321
1322         send_uid_list(f);
1323
1324         /* send the io_error flag */
1325         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1326
1327         io_end_buffering();
1328         stats.flist_size = stats.total_written - start_write;
1329         stats.num_files = flist->count;
1330
1331         if (verbose > 3)
1332                 output_flist(flist);
1333
1334         if (verbose > 2)
1335                 rprintf(FINFO, "send_file_list done\n");
1336
1337         return flist;
1338 }
1339
1340 struct file_list *recv_file_list(int f)
1341 {
1342         struct file_list *flist;
1343         unsigned short flags;
1344         int64 start_read;
1345
1346         if (show_filelist_p())
1347                 start_filelist_progress("receiving file list");
1348
1349         start_read = stats.total_read;
1350
1351         flist = flist_new(WITH_HLINK, "recv_file_list");
1352
1353         flist->count = 0;
1354         flist->malloced = 1000;
1355         flist->files = new_array(struct file_struct *, flist->malloced);
1356         if (!flist->files)
1357                 goto oom;
1358
1359         while ((flags = read_byte(f)) != 0) {
1360                 struct file_struct *file;
1361
1362                 flist_expand(flist);
1363
1364                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1365                         flags |= read_byte(f) << 8;
1366                 file = receive_file_entry(flist, flags, f);
1367
1368                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1369                         stats.total_size += file->length;
1370
1371                 flist->files[flist->count++] = file;
1372
1373                 maybe_emit_filelist_progress(flist->count);
1374
1375                 if (verbose > 2) {
1376                         rprintf(FINFO, "recv_file_name(%s)\n",
1377                                 f_name(file, NULL));
1378                 }
1379         }
1380         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1381
1382         if (verbose > 2)
1383                 rprintf(FINFO, "received %d names\n", flist->count);
1384
1385         if (show_filelist_p())
1386                 finish_filelist_progress(flist);
1387
1388         clean_flist(flist, relative_paths, 1);
1389
1390         if (f >= 0) {
1391                 recv_uid_list(f, flist);
1392
1393                 /* Recv the io_error flag */
1394                 if (lp_ignore_errors(module_id) || ignore_errors)
1395                         read_int(f);
1396                 else
1397                         io_error |= read_int(f);
1398         }
1399
1400         if (verbose > 3)
1401                 output_flist(flist);
1402
1403         if (list_only) {
1404                 int i;
1405                 for (i = 0; i < flist->count; i++)
1406                         list_file_entry(flist->files[i]);
1407         }
1408
1409         if (verbose > 2)
1410                 rprintf(FINFO, "recv_file_list done\n");
1411
1412         stats.flist_size = stats.total_read - start_read;
1413         stats.num_files = flist->count;
1414
1415         return flist;
1416
1417   oom:
1418         out_of_memory("recv_file_list");
1419         return NULL;            /* not reached */
1420 }
1421
1422 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1423 {
1424         return f_name_cmp(*file1, *file2);
1425 }
1426
1427 /* Search for an identically-named item in the file list.  Note that the
1428  * items must agree in their directory-ness, or no match is returned. */
1429 int flist_find(struct file_list *flist, struct file_struct *f)
1430 {
1431         int low = flist->low, high = flist->high;
1432         int diff, mid, mid_up;
1433
1434         while (low <= high) {
1435                 mid = (low + high) / 2;
1436                 if (flist->files[mid]->basename)
1437                         mid_up = mid;
1438                 else {
1439                         /* Scan for the next non-empty entry using the cached
1440                          * distance values.  If the value isn't fully up-to-
1441                          * date, update it. */
1442                         mid_up = mid + flist->files[mid]->dir.depth;
1443                         if (!flist->files[mid_up]->basename) {
1444                                 do {
1445                                     mid_up += flist->files[mid_up]->dir.depth;
1446                                 } while (!flist->files[mid_up]->basename);
1447                                 flist->files[mid]->dir.depth = mid_up - mid;
1448                         }
1449                         if (mid_up > high) {
1450                                 /* If there's nothing left above us, set high to
1451                                  * a non-empty entry below us and continue. */
1452                                 high = mid - flist->files[mid]->length;
1453                                 if (!flist->files[high]->basename) {
1454                                         do {
1455                                             high -= flist->files[high]->length;
1456                                         } while (!flist->files[high]->basename);
1457                                         flist->files[mid]->length = mid - high;
1458                                 }
1459                                 continue;
1460                         }
1461                 }
1462                 diff = f_name_cmp(flist->files[mid_up], f);
1463                 if (diff == 0) {
1464                         if (protocol_version < 29
1465                             && S_ISDIR(flist->files[mid_up]->mode)
1466                             != S_ISDIR(f->mode))
1467                                 return -1;
1468                         return mid_up;
1469                 }
1470                 if (diff < 0)
1471                         low = mid_up + 1;
1472                 else
1473                         high = mid - 1;
1474         }
1475         return -1;
1476 }
1477
1478 /*
1479  * Free up any resources a file_struct has allocated
1480  * and clear the file.
1481  */
1482 void clear_file(struct file_struct *file, struct file_list *flist)
1483 {
1484         if (flist->hlink_pool && file->link_u.idev)
1485                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1486         memset(file, 0, file_struct_len);
1487         /* In an empty entry, dir.depth is an offset to the next non-empty
1488          * entry.  Likewise for length in the opposite direction.  We assume
1489          * that we're alone for now since flist_find() will adjust the counts
1490          * it runs into that aren't up-to-date. */
1491         file->length = file->dir.depth = 1;
1492 }
1493
1494 /*
1495  * allocate a new file list
1496  */
1497 struct file_list *flist_new(int with_hlink, char *msg)
1498 {
1499         struct file_list *flist;
1500
1501         flist = new(struct file_list);
1502         if (!flist)
1503                 out_of_memory(msg);
1504
1505         memset(flist, 0, sizeof (struct file_list));
1506
1507         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1508             out_of_memory, POOL_INTERN)))
1509                 out_of_memory(msg);
1510
1511 #ifdef SUPPORT_HARD_LINKS
1512         if (with_hlink && preserve_hard_links) {
1513                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1514                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1515                         out_of_memory(msg);
1516         }
1517 #endif
1518
1519         return flist;
1520 }
1521
1522 /*
1523  * free up all elements in a flist
1524  */
1525 void flist_free(struct file_list *flist)
1526 {
1527         pool_destroy(flist->file_pool);
1528         pool_destroy(flist->hlink_pool);
1529         free(flist->files);
1530         free(flist);
1531 }
1532
1533 /*
1534  * This routine ensures we don't have any duplicate names in our file list.
1535  * duplicate names can cause corruption because of the pipelining
1536  */
1537 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1538 {
1539         char fbuf[MAXPATHLEN];
1540         int i, prev_i = 0;
1541
1542         if (!flist)
1543                 return;
1544         if (flist->count == 0) {
1545                 flist->high = -1;
1546                 return;
1547         }
1548
1549         qsort(flist->files, flist->count,
1550             sizeof flist->files[0], (int (*)())file_compare);
1551
1552         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1553                 if (flist->files[i]->basename) {
1554                         prev_i = i;
1555                         break;
1556                 }
1557         }
1558         flist->low = prev_i;
1559         while (++i < flist->count) {
1560                 int j;
1561                 struct file_struct *file = flist->files[i];
1562
1563                 if (!file->basename)
1564                         continue;
1565                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1566                         j = prev_i;
1567                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1568                         int save_mode = file->mode;
1569                         /* Make sure that this directory doesn't duplicate a
1570                          * non-directory earlier in the list. */
1571                         flist->high = prev_i;
1572                         file->mode = S_IFREG;
1573                         j = flist_find(flist, file);
1574                         file->mode = save_mode;
1575                 } else
1576                         j = -1;
1577                 if (j >= 0) {
1578                         struct file_struct *fp = flist->files[j];
1579                         int keep, drop;
1580                         /* If one is a dir and the other is not, we want to
1581                          * keep the dir because it might have contents in the
1582                          * list. */
1583                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1584                                 if (S_ISDIR(file->mode))
1585                                         keep = i, drop = j;
1586                                 else
1587                                         keep = j, drop = i;
1588                         } else
1589                                 keep = j, drop = i;
1590                         if (verbose > 1 && !am_server) {
1591                                 rprintf(FINFO,
1592                                         "removing duplicate name %s from file list (%d)\n",
1593                                         f_name(file, fbuf), drop);
1594                         }
1595                         /* Make sure we don't lose track of a user-specified
1596                          * top directory. */
1597                         flist->files[keep]->flags |= flist->files[drop]->flags
1598                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1599
1600                         clear_file(flist->files[drop], flist);
1601
1602                         if (keep == i) {
1603                                 if (flist->low == drop) {
1604                                         for (j = drop + 1;
1605                                              j < i && !flist->files[j]->basename;
1606                                              j++) {}
1607                                         flist->low = j;
1608                                 }
1609                                 prev_i = i;
1610                         }
1611                 } else
1612                         prev_i = i;
1613         }
1614         flist->high = no_dups ? prev_i : flist->count - 1;
1615
1616         if (strip_root) {
1617                 /* We need to strip off the leading slashes for relative
1618                  * paths, but this must be done _after_ the sorting phase. */
1619                 for (i = flist->low; i <= flist->high; i++) {
1620                         struct file_struct *file = flist->files[i];
1621
1622                         if (!file->dirname)
1623                                 continue;
1624                         while (*file->dirname == '/')
1625                                 file->dirname++;
1626                         if (!*file->dirname)
1627                                 file->dirname = NULL;
1628                 }
1629         }
1630
1631         if (prune_empty_dirs && no_dups) {
1632                 int j, prev_depth = 0;
1633
1634                 prev_i = 0; /* It's OK that this isn't really true. */
1635
1636                 for (i = flist->low; i <= flist->high; i++) {
1637                         struct file_struct *fp, *file = flist->files[i];
1638
1639                         /* This temporarily abuses the dir.depth value for a
1640                          * directory that is in a chain that might get pruned.
1641                          * We restore the old value if it gets a reprieve. */
1642                         if (S_ISDIR(file->mode) && file->dir.depth) {
1643                                 /* Dump empty dirs when coming back down. */
1644                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1645                                         fp = flist->files[prev_i];
1646                                         if (fp->dir.depth >= 0)
1647                                                 break;
1648                                         prev_i = -fp->dir.depth-1;
1649                                         clear_file(fp, flist);
1650                                 }
1651                                 prev_depth = file->dir.depth;
1652                                 if (is_excluded(f_name(file, fbuf), 1,
1653                                                        ALL_FILTERS)) {
1654                                         /* Keep dirs through this dir. */
1655                                         for (j = prev_depth-1; ; j--) {
1656                                                 fp = flist->files[prev_i];
1657                                                 if (fp->dir.depth >= 0)
1658                                                         break;
1659                                                 prev_i = -fp->dir.depth-1;
1660                                                 fp->dir.depth = j;
1661                                         }
1662                                 } else
1663                                         file->dir.depth = -prev_i-1;
1664                                 prev_i = i;
1665                         } else {
1666                                 /* Keep dirs through this non-dir. */
1667                                 for (j = prev_depth; ; j--) {
1668                                         fp = flist->files[prev_i];
1669                                         if (fp->dir.depth >= 0)
1670                                                 break;
1671                                         prev_i = -fp->dir.depth-1;
1672                                         fp->dir.depth = j;
1673                                 }
1674                         }
1675                 }
1676                 /* Dump empty all remaining empty dirs. */
1677                 while (1) {
1678                         struct file_struct *fp = flist->files[prev_i];
1679                         if (fp->dir.depth >= 0)
1680                                 break;
1681                         prev_i = -fp->dir.depth-1;
1682                         clear_file(fp, flist);
1683                 }
1684
1685                 for (i = flist->low; i <= flist->high; i++) {
1686                         if (flist->files[i]->basename)
1687                                 break;
1688                 }
1689                 flist->low = i;
1690                 for (i = flist->high; i >= flist->low; i--) {
1691                         if (flist->files[i]->basename)
1692                                 break;
1693                 }
1694                 flist->high = i;
1695         }
1696 }
1697
1698 static void output_flist(struct file_list *flist)
1699 {
1700         char uidbuf[16], gidbuf[16], depthbuf[16];
1701         struct file_struct *file;
1702         const char *who = who_am_i();
1703         int i;
1704
1705         for (i = 0; i < flist->count; i++) {
1706                 file = flist->files[i];
1707                 if ((am_root || am_sender) && preserve_uid)
1708                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1709                 else
1710                         *uidbuf = '\0';
1711                 if (preserve_gid && file->gid != GID_NONE)
1712                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1713                 else
1714                         *gidbuf = '\0';
1715                 if (!am_sender)
1716                         sprintf(depthbuf, "%d", file->dir.depth);
1717                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1718                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1719                         file->dirname ? file->dirname : "",
1720                         file->dirname ? "/" : "", NS(file->basename),
1721                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1722                         (double)file->length, uidbuf, gidbuf, file->flags);
1723         }
1724 }
1725
1726 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1727 enum fnc_type { t_PATH, t_ITEM };
1728
1729 /* Compare the names of two file_struct entities, similar to how strcmp()
1730  * would do if it were operating on the joined strings.
1731  *
1732  * Some differences beginning with protocol_version 29: (1) directory names
1733  * are compared with an assumed trailing slash so that they compare in a
1734  * way that would cause them to sort immediately prior to any content they
1735  * may have; (2) a directory of any name compares after a non-directory of
1736  * any name at the same depth; (3) a directory with name "." compares prior
1737  * to anything else.  These changes mean that a directory and a non-dir
1738  * with the same name will not compare as equal (protocol_version >= 29).
1739  *
1740  * The dirname component can be an empty string, but the basename component
1741  * cannot (and never is in the current codebase).  The basename component
1742  * may be NULL (for a removed item), in which case it is considered to be
1743  * after any existing item. */
1744 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1745 {
1746         int dif;
1747         const uchar *c1, *c2;
1748         enum fnc_state state1, state2;
1749         enum fnc_type type1, type2;
1750         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1751
1752         if (!f1 || !f1->basename) {
1753                 if (!f2 || !f2->basename)
1754                         return 0;
1755                 return -1;
1756         }
1757         if (!f2 || !f2->basename)
1758                 return 1;
1759
1760         c1 = (uchar*)f1->dirname;
1761         c2 = (uchar*)f2->dirname;
1762         if (c1 == c2)
1763                 c1 = c2 = NULL;
1764         if (!c1) {
1765                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1766                 c1 = (uchar*)f1->basename;
1767                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1768                         type1 = t_ITEM;
1769                         state1 = s_TRAILING;
1770                         c1 = (uchar*)"";
1771                 } else
1772                         state1 = s_BASE;
1773         } else if (!*c1) {
1774                 type1 = t_path;
1775                 state1 = s_SLASH;
1776                 c1 = (uchar*)"/";
1777         } else {
1778                 type1 = t_path;
1779                 state1 = s_DIR;
1780         }
1781         if (!c2) {
1782                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1783                 c2 = (uchar*)f2->basename;
1784                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1785                         type2 = t_ITEM;
1786                         state2 = s_TRAILING;
1787                         c2 = (uchar*)"";
1788                 } else
1789                         state2 = s_BASE;
1790         } else if (!*c2) {
1791                 type2 = t_path;
1792                 state2 = s_SLASH;
1793                 c2 = (uchar*)"/";
1794         } else {
1795                 type2 = t_path;
1796                 state2 = s_DIR;
1797         }
1798
1799         if (type1 != type2)
1800                 return type1 == t_PATH ? 1 : -1;
1801
1802         while (1) {
1803                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1804                         break;
1805                 if (!*c1) {
1806                         switch (state1) {
1807                         case s_DIR:
1808                                 state1 = s_SLASH;
1809                                 c1 = (uchar*)"/";
1810                                 break;
1811                         case s_SLASH:
1812                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1813                                 c1 = (uchar*)f1->basename;
1814                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1815                                         type1 = t_ITEM;
1816                                         state1 = s_TRAILING;
1817                                         c1 = (uchar*)"";
1818                                 } else
1819                                         state1 = s_BASE;
1820                                 break;
1821                         case s_BASE:
1822                                 state1 = s_TRAILING;
1823                                 if (type1 == t_PATH) {
1824                                         c1 = (uchar*)"/";
1825                                         break;
1826                                 }
1827                                 /* FALL THROUGH */
1828                         case s_TRAILING:
1829                                 type1 = t_ITEM;
1830                                 break;
1831                         }
1832                         if (*c2 && type1 != type2)
1833                                 return type1 == t_PATH ? 1 : -1;
1834                 }
1835                 if (!*c2) {
1836                         switch (state2) {
1837                         case s_DIR:
1838                                 state2 = s_SLASH;
1839                                 c2 = (uchar*)"/";
1840                                 break;
1841                         case s_SLASH:
1842                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1843                                 c2 = (uchar*)f2->basename;
1844                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1845                                         type2 = t_ITEM;
1846                                         state2 = s_TRAILING;
1847                                         c2 = (uchar*)"";
1848                                 } else
1849                                         state2 = s_BASE;
1850                                 break;
1851                         case s_BASE:
1852                                 state2 = s_TRAILING;
1853                                 if (type2 == t_PATH) {
1854                                         c2 = (uchar*)"/";
1855                                         break;
1856                                 }
1857                                 /* FALL THROUGH */
1858                         case s_TRAILING:
1859                                 if (!*c1)
1860                                         return 0;
1861                                 type2 = t_ITEM;
1862                                 break;
1863                         }
1864                         if (type1 != type2)
1865                                 return type1 == t_PATH ? 1 : -1;
1866                 }
1867         }
1868
1869         return dif;
1870 }
1871
1872 /* Return a copy of the full filename of a flist entry, using the indicated
1873  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1874  * done because we checked the size when creating the file_struct entry.
1875  */
1876 char *f_name(struct file_struct *f, char *fbuf)
1877 {
1878         if (!f || !f->basename)
1879                 return NULL;
1880
1881         if (!fbuf) {
1882                 static char names[5][MAXPATHLEN];
1883                 static unsigned int n;
1884
1885                 n = (n + 1) % (sizeof names / sizeof names[0]);
1886
1887                 fbuf = names[n];
1888         }
1889
1890         if (f->dirname) {
1891                 int len = strlen(f->dirname);
1892                 memcpy(fbuf, f->dirname, len);
1893                 fbuf[len] = '/';
1894                 strcpy(fbuf + len + 1, f->basename);
1895         } else
1896                 strcpy(fbuf, f->basename);
1897
1898         return fbuf;
1899 }
1900
1901 /* Do a non-recursive scan of the named directory, possibly ignoring all
1902  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1903  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1904  * buffer (the functions we call will append names onto the end, but the old
1905  * dir value will be restored on exit). */
1906 struct file_list *get_dirlist(char *dirname, int dlen,
1907                               int ignore_filter_rules)
1908 {
1909         struct file_list *dirlist;
1910         char dirbuf[MAXPATHLEN];
1911         int save_recurse = recurse;
1912         int save_xfer_dirs = xfer_dirs;
1913
1914         if (dlen < 0) {
1915                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1916                 if (dlen >= MAXPATHLEN)
1917                         return NULL;
1918                 dirname = dirbuf;
1919         }
1920
1921         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1922
1923         recurse = 0;
1924         xfer_dirs = 1;
1925         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1926         xfer_dirs = save_xfer_dirs;
1927         recurse = save_recurse;
1928         if (do_progress)
1929                 flist_count_offset += dirlist->count;
1930
1931         clean_flist(dirlist, 0, 0);
1932
1933         if (verbose > 3)
1934                 output_flist(dirlist);
1935
1936         return dirlist;
1937 }