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 copy_links;
  57 extern int copy_unsafe_links;
  58 extern int protocol_version;
  59 extern int sanitize_paths;
  60 extern int orig_umask;
  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 perms[11];
 133
 134         if (!f->basename) {
 135                 /* this can happen if duplicate names were removed */
 136                 return;
 137         }
 138
 139         permstring(perms, 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                         perms,
 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                         perms,
 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, 0) < 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         if (!preserve_perms) {
 716                 /* set an appropriate set of permissions based on original
 717                  * permissions and umask. This emulates what GNU cp does */
 718                 file->mode &= ~orig_umask;
 719         }
 720
 721         return file;
 722 }
 723
 724 /**
 725  * Create a file_struct for a named file by reading its stat()
 726  * information and performing extensive checks against global
 727  * options.
 728  *
 729  * @return the new file, or NULL if there was an error or this file
 730  * should be excluded.
 731  *
 732  * @todo There is a small optimization opportunity here to avoid
 733  * stat()ing the file in some circumstances, which has a certain cost.
 734  * We are called immediately after doing readdir(), and so we may
 735  * already know the d_type of the file.  We could for example avoid
 736  * statting directories if we're not recursing, but this is not a very
 737  * important case.  Some systems may not have d_type.
 738  **/
 739 struct file_struct *make_file(char *fname, struct file_list *flist,
 740                               STRUCT_STAT *stp, unsigned short flags,
 741                               int filter_level)
 742 {
 743         static char *lastdir;
 744         static int lastdir_len = -1;
 745         struct file_struct *file;
 746         STRUCT_STAT st;
 747         char sum[SUM_LENGTH];
 748         char thisname[MAXPATHLEN];
 749         char linkname[MAXPATHLEN];
 750         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 751         char *basename, *dirname, *bp;
 752
 753         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 754                 lastdir_len = -1;
 755
 756         if (strlcpy(thisname, fname, sizeof thisname)
 757             >= sizeof thisname - flist_dir_len) {
 758                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 759                 return NULL;
 760         }
 761         clean_fname(thisname, 0);
 762         if (sanitize_paths)
 763                 sanitize_path(thisname, thisname, "", 0);
 764
 765         memset(sum, 0, SUM_LENGTH);
 766
 767         if (stp && S_ISDIR(stp->st_mode))
 768                 st = *stp; /* Needed for "symlink/." with --relative. */
 769         else if (readlink_stat(thisname, &st, linkname) != 0) {
 770                 int save_errno = errno;
 771                 /* See if file is excluded before reporting an error. */
 772                 if (filter_level != NO_FILTERS
 773                     && is_excluded(thisname, 0, filter_level))
 774                         return NULL;
 775                 if (save_errno == ENOENT) {
 776 #ifdef SUPPORT_LINKS
 777                         /* Avoid "vanished" error if symlink points nowhere. */
 778                         if (copy_links && do_lstat(thisname, &st) == 0
 779                             && S_ISLNK(st.st_mode)) {
 780                                 io_error |= IOERR_GENERAL;
 781                                 rprintf(FERROR, "symlink has no referent: %s\n",
 782                                         full_fname(thisname));
 783                         } else
 784 #endif
 785                         {
 786                                 enum logcode c = am_daemon && protocol_version < 28
 787                                     ? FERROR : FINFO;
 788                                 io_error |= IOERR_VANISHED;
 789                                 rprintf(c, "file has vanished: %s\n",
 790                                         full_fname(thisname));
 791                         }
 792                 } else {
 793                         io_error |= IOERR_GENERAL;
 794                         rsyserr(FERROR, save_errno, "readlink %s failed",
 795                                 full_fname(thisname));
 796                 }
 797                 return NULL;
 798         }
 799
 800         /* backup.c calls us with filter_level set to NO_FILTERS. */
 801         if (filter_level == NO_FILTERS)
 802                 goto skip_filters;
 803
 804         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 805                 rprintf(FINFO, "skipping directory %s\n", thisname);
 806                 return NULL;
 807         }
 808
 809         /* We only care about directories because we need to avoid recursing
 810          * into a mount-point directory, not to avoid copying a symlinked
 811          * file if -L (or similar) was specified. */
 812         if (one_file_system && st.st_dev != filesystem_dev
 813          && S_ISDIR(st.st_mode)) {
 814                 if (one_file_system > 1) {
 815                         if (verbose > 2) {
 816                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 817                                         thisname);
 818                         }
 819                         return NULL;
 820                 }
 821                 flags |= FLAG_MOUNT_POINT;
 822         }
 823
 824         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 825                 return NULL;
 826
 827         if (lp_ignore_nonreadable(module_id)) {
 828 #ifdef SUPPORT_LINKS
 829                 if (!S_ISLNK(st.st_mode))
 830 #endif
 831                         if (access(thisname, R_OK) != 0)
 832                                 return NULL;
 833         }
 834
 835   skip_filters:
 836
 837         if (verbose > 2) {
 838                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 839                         who_am_i(), thisname, filter_level);
 840         }
 841
 842         if ((basename = strrchr(thisname, '/')) != NULL) {
 843                 dirname_len = ++basename - thisname; /* counts future '\0' */
 844                 if (lastdir_len == dirname_len - 1
 845                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 846                         dirname = lastdir;
 847                         dirname_len = 0; /* indicates no copy is needed */
 848                 } else
 849                         dirname = thisname;
 850         } else {
 851                 basename = thisname;
 852                 dirname = NULL;
 853                 dirname_len = 0;
 854         }
 855         basename_len = strlen(basename) + 1; /* count the '\0' */
 856
 857 #ifdef SUPPORT_LINKS
 858         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 859 #else
 860         linkname_len = 0;
 861 #endif
 862
 863         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 864                 ? MD4_SUM_LENGTH : 0;
 865
 866         alloc_len = file_struct_len + dirname_len + basename_len
 867             + linkname_len + sum_len;
 868         if (flist)
 869                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 870         else {
 871                 if (!(bp = new_array(char, alloc_len)))
 872                         out_of_memory("make_file");
 873         }
 874
 875         file = (struct file_struct *)bp;
 876         memset(bp, 0, file_struct_len);
 877         bp += file_struct_len;
 878
 879         file->flags = flags;
 880         file->modtime = st.st_mtime;
 881         file->length = st.st_size;
 882         file->mode = st.st_mode;
 883         file->uid = st.st_uid;
 884         file->gid = st.st_gid;
 885
 886 #ifdef SUPPORT_HARD_LINKS
 887         if (flist && flist->hlink_pool) {
 888                 if (protocol_version < 28) {
 889                         if (S_ISREG(st.st_mode))
 890                                 file->link_u.idev = pool_talloc(
 891                                     flist->hlink_pool, struct idev, 1,
 892                                     "inode_table");
 893                 } else {
 894                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 895                                 file->link_u.idev = pool_talloc(
 896                                     flist->hlink_pool, struct idev, 1,
 897                                     "inode_table");
 898                 }
 899         }
 900         if (file->link_u.idev) {
 901                 file->F_DEV = st.st_dev;
 902                 file->F_INODE = st.st_ino;
 903         }
 904 #endif
 905
 906         if (dirname_len) {
 907                 file->dirname = lastdir = bp;
 908                 lastdir_len = dirname_len - 1;
 909                 memcpy(bp, dirname, dirname_len - 1);
 910                 bp += dirname_len;
 911                 bp[-1] = '\0';
 912         } else if (dirname)
 913                 file->dirname = dirname;
 914
 915         file->basename = bp;
 916         memcpy(bp, basename, basename_len);
 917         bp += basename_len;
 918
 919 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 920         if ((preserve_devices && IS_DEVICE(st.st_mode))
 921          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 922                 file->u.rdev = st.st_rdev;
 923 #endif
 924
 925 #ifdef SUPPORT_LINKS
 926         if (linkname_len) {
 927                 file->u.link = bp;
 928                 memcpy(bp, linkname, linkname_len);
 929                 bp += linkname_len;
 930         }
 931 #endif
 932
 933         if (sum_len) {
 934                 file->u.sum = bp;
 935                 file_checksum(thisname, bp, st.st_size);
 936                 /*bp += sum_len;*/
 937         }
 938
 939         file->dir.root = flist_dir;
 940
 941         /* This code is only used by the receiver when it is building
 942          * a list of files for a delete pass. */
 943         if (keep_dirlinks && linkname_len && flist) {
 944                 STRUCT_STAT st2;
 945                 int save_mode = file->mode;
 946                 file->mode = S_IFDIR; /* Find a directory with our name. */
 947                 if (flist_find(the_file_list, file) >= 0
 948                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 949                         file->modtime = st2.st_mtime;
 950                         file->length = st2.st_size;
 951                         file->mode = st2.st_mode;
 952                         file->uid = st2.st_uid;
 953                         file->gid = st2.st_gid;
 954                         file->u.link = NULL;
 955                 } else
 956                         file->mode = save_mode;
 957         }
 958
 959         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 960                 stats.total_size += st.st_size;
 961
 962         return file;
 963 }
 964
 965 static struct file_struct *send_file_name(int f, struct file_list *flist,
 966                                           char *fname, STRUCT_STAT *stp,
 967                                           unsigned short flags)
 968 {
 969         struct file_struct *file;
 970
 971         file = make_file(fname, flist, stp, flags,
 972                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 973         if (!file)
 974                 return NULL;
 975
 976         if (chmod_modes && !S_ISLNK(file->mode))
 977                 file->mode = tweak_mode(file->mode, chmod_modes);
 978
 979         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 980
 981         flist_expand(flist);
 982
 983         if (file->basename[0]) {
 984                 flist->files[flist->count++] = file;
 985                 send_file_entry(file, f);
 986         }
 987         return file;
 988 }
 989
 990 static void send_if_directory(int f, struct file_list *flist,
 991                               struct file_struct *file,
 992                               char *fbuf, unsigned int ol)
 993 {
 994         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 995
 996         if (S_ISDIR(file->mode)
 997             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 998                 void *save_filters;
 999                 unsigned int len = strlen(fbuf);
1000                 if (len > 1 && fbuf[len-1] == '/')
1001                         fbuf[--len] = '\0';
1002                 if (len >= MAXPATHLEN - 1) {
1003                         io_error |= IOERR_GENERAL;
1004                         rprintf(FERROR, "skipping long-named directory: %s\n",
1005                                 full_fname(fbuf));
1006                         return;
1007                 }
1008                 save_filters = push_local_filters(fbuf, len);
1009                 send_directory(f, flist, fbuf, len);
1010                 pop_local_filters(save_filters);
1011                 fbuf[ol] = '\0';
1012                 if (is_dot_dir)
1013                         fbuf[ol-1] = '.';
1014         }
1015 }
1016
1017 /* This function is normally called by the sender, but the receiving side also
1018  * calls it from get_dirlist() with f set to -1 so that we just construct the
1019  * file list in memory without sending it over the wire.  Also, get_dirlist()
1020  * might call this with f set to -2, which also indicates that local filter
1021  * rules should be ignored. */
1022 static void send_directory(int f, struct file_list *flist,
1023                            char *fbuf, int len)
1024 {
1025         struct dirent *di;
1026         unsigned remainder;
1027         char *p;
1028         DIR *d;
1029         int start = flist->count;
1030
1031         if (!(d = opendir(fbuf))) {
1032                 io_error |= IOERR_GENERAL;
1033                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1034                 return;
1035         }
1036
1037         p = fbuf + len;
1038         if (len != 1 || *fbuf != '/')
1039                 *p++ = '/';
1040         *p = '\0';
1041         remainder = MAXPATHLEN - (p - fbuf);
1042
1043         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1044                 char *dname = d_name(di);
1045                 if (dname[0] == '.' && (dname[1] == '\0'
1046                     || (dname[1] == '.' && dname[2] == '\0')))
1047                         continue;
1048                 if (strlcpy(p, dname, remainder) >= remainder) {
1049                         io_error |= IOERR_GENERAL;
1050                         rprintf(FINFO,
1051                                 "cannot send long-named file %s\n",
1052                                 full_fname(fbuf));
1053                         continue;
1054                 }
1055
1056                 send_file_name(f, flist, fbuf, NULL, 0);
1057         }
1058
1059         fbuf[len] = '\0';
1060
1061         if (errno) {
1062                 io_error |= IOERR_GENERAL;
1063                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1064         }
1065
1066         closedir(d);
1067
1068         if (recurse) {
1069                 int i, end = flist->count - 1;
1070                 for (i = start; i <= end; i++)
1071                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1072         }
1073 }
1074
1075 struct file_list *send_file_list(int f, int argc, char *argv[])
1076 {
1077         int len;
1078         STRUCT_STAT st;
1079         char *p, *dir, olddir[sizeof curr_dir];
1080         char lastpath[MAXPATHLEN] = "";
1081         struct file_list *flist;
1082         struct timeval start_tv, end_tv;
1083         int64 start_write;
1084         int use_ff_fd = 0;
1085
1086         if (show_filelist_p())
1087                 start_filelist_progress("building file list");
1088
1089         start_write = stats.total_written;
1090         gettimeofday(&start_tv, NULL);
1091
1092         flist = flist_new(WITH_HLINK, "send_file_list");
1093
1094         io_start_buffering_out();
1095         if (filesfrom_fd >= 0) {
1096                 if (argv[0] && !push_dir(argv[0])) {
1097                         rsyserr(FERROR, errno, "push_dir %s failed",
1098                                 full_fname(argv[0]));
1099                         exit_cleanup(RERR_FILESELECT);
1100                 }
1101                 use_ff_fd = 1;
1102         }
1103
1104         while (1) {
1105                 char fbuf[MAXPATHLEN];
1106                 char *fn;
1107                 int is_dot_dir;
1108
1109                 if (use_ff_fd) {
1110                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1111                                 break;
1112                         sanitize_path(fbuf, fbuf, "", 0);
1113                 } else {
1114                         if (argc-- == 0)
1115                                 break;
1116                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1117                         if (sanitize_paths)
1118                                 sanitize_path(fbuf, fbuf, "", 0);
1119                 }
1120
1121                 len = strlen(fbuf);
1122                 if (relative_paths) {
1123                         /* We clean up fbuf below. */
1124                         is_dot_dir = 0;
1125                 } else if (!len || fbuf[len - 1] == '/') {
1126                         if (len == 2 && fbuf[0] == '.') {
1127                                 /* Turn "./" into just "." rather than "./." */
1128                                 fbuf[1] = '\0';
1129                         } else {
1130                                 if (len + 1 >= MAXPATHLEN)
1131                                         overflow_exit("send_file_list");
1132                                 fbuf[len++] = '.';
1133                                 fbuf[len] = '\0';
1134                         }
1135                         is_dot_dir = 1;
1136                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1137                     && (len == 2 || fbuf[len-3] == '/')) {
1138                         if (len + 2 >= MAXPATHLEN)
1139                                 overflow_exit("send_file_list");
1140                         fbuf[len++] = '/';
1141                         fbuf[len++] = '.';
1142                         fbuf[len] = '\0';
1143                         is_dot_dir = 1;
1144                 } else {
1145                         is_dot_dir = fbuf[len-1] == '.'
1146                                    && (len == 1 || fbuf[len-2] == '/');
1147                 }
1148
1149                 if (link_stat(fbuf, &st, keep_dirlinks) != 0) {
1150                         io_error |= IOERR_GENERAL;
1151                         rsyserr(FERROR, errno, "link_stat %s failed",
1152                                 full_fname(fbuf));
1153                         continue;
1154                 }
1155
1156                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1157                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1158                         continue;
1159                 }
1160
1161                 dir = NULL;
1162                 olddir[0] = '\0';
1163
1164                 if (!relative_paths) {
1165                         p = strrchr(fbuf, '/');
1166                         if (p) {
1167                                 *p = '\0';
1168                                 if (p == fbuf)
1169                                         dir = "/";
1170                                 else
1171                                         dir = fbuf;
1172                                 len -= p - fbuf + 1;
1173                                 fn = p + 1;
1174                         } else
1175                                 fn = fbuf;
1176                 } else {
1177                         if ((p = strstr(fbuf, "/./")) != NULL) {
1178                                 *p = '\0';
1179                                 if (p == fbuf)
1180                                         dir = "/";
1181                                 else
1182                                         dir = fbuf;
1183                                 len -= p - fbuf + 3;
1184                                 fn = p + 3;
1185                         } else
1186                                 fn = fbuf;
1187                         /* Get rid of trailing "/" and "/.". */
1188                         while (len) {
1189                                 if (fn[len - 1] == '/') {
1190                                         is_dot_dir = 1;
1191                                         if (!--len && !dir) {
1192                                                 len++;
1193                                                 break;
1194                                         }
1195                                 }
1196                                 else if (len >= 2 && fn[len - 1] == '.'
1197                                                   && fn[len - 2] == '/') {
1198                                         is_dot_dir = 1;
1199                                         if (!(len -= 2) && !dir) {
1200                                                 len++;
1201                                                 break;
1202                                         }
1203                                 } else
1204                                         break;
1205                         }
1206                         fn[len] = '\0';
1207                         /* Reject a ".." dir in the active part of the path. */
1208                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1209                                 if ((p[2] == '/' || p[2] == '\0')
1210                                  && (p == fn || p[-1] == '/')) {
1211                                         rprintf(FERROR,
1212                                             "found \"..\" dir in relative path: %s\n",
1213                                             fbuf);
1214                                         exit_cleanup(RERR_SYNTAX);
1215                                 }
1216                         }
1217                 }
1218
1219                 if (!*fn) {
1220                         len = 1;
1221                         fn = ".";
1222                 }
1223
1224                 if (dir && *dir) {
1225                         static char *lastdir;
1226                         static int lastdir_len;
1227
1228                         strlcpy(olddir, curr_dir, sizeof olddir);
1229
1230                         if (!push_dir(dir)) {
1231                                 io_error |= IOERR_GENERAL;
1232                                 rsyserr(FERROR, errno, "push_dir %s failed",
1233                                         full_fname(dir));
1234                                 continue;
1235                         }
1236
1237                         if (lastdir && strcmp(lastdir, dir) == 0) {
1238                                 flist_dir = lastdir;
1239                                 flist_dir_len = lastdir_len;
1240                         } else {
1241                                 flist_dir = lastdir = strdup(dir);
1242                                 flist_dir_len = lastdir_len = strlen(dir);
1243                         }
1244                 }
1245
1246                 if (fn != fbuf)
1247                         memmove(fbuf, fn, len + 1);
1248
1249                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1250                         /* Send the implied directories at the start of the
1251                          * source spec, so we get their permissions right. */
1252                         char *lp = lastpath, *slash = fbuf;
1253                         *p = '\0';
1254                         /* Skip any initial directories in our path that we
1255                          * have in common with lastpath. */
1256                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1257                                 if (*fn == '/')
1258                                         slash = fn;
1259                         }
1260                         *p = '/';
1261                         if (fn != p || (*lp && *lp != '/')) {
1262                                 int save_copy_links = copy_links;
1263                                 int save_xfer_dirs = xfer_dirs;
1264                                 copy_links = copy_unsafe_links;
1265                                 xfer_dirs = 1;
1266                                 while ((slash = strchr(slash+1, '/')) != 0) {
1267                                         *slash = '\0';
1268                                         send_file_name(f, flist, fbuf, NULL, 0);
1269                                         *slash = '/';
1270                                 }
1271                                 copy_links = save_copy_links;
1272                                 xfer_dirs = save_xfer_dirs;
1273                                 *p = '\0';
1274                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1275                                 *p = '/';
1276                         }
1277                 }
1278
1279                 if (one_file_system)
1280                         filesystem_dev = st.st_dev;
1281
1282                 if (recurse || (xfer_dirs && is_dot_dir)) {
1283                         struct file_struct *file;
1284                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1285                         if (file)
1286                                 send_if_directory(f, flist, file, fbuf, len);
1287                 } else
1288                         send_file_name(f, flist, fbuf, &st, 0);
1289
1290                 if (olddir[0]) {
1291                         flist_dir = NULL;
1292                         flist_dir_len = 0;
1293                         if (!pop_dir(olddir)) {
1294                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1295                                         full_fname(olddir));
1296                                 exit_cleanup(RERR_FILESELECT);
1297                         }
1298                 }
1299         }
1300
1301         gettimeofday(&end_tv, NULL);
1302         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1303                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1304         if (stats.flist_buildtime == 0)
1305                 stats.flist_buildtime = 1;
1306         start_tv = end_tv;
1307
1308         send_file_entry(NULL, f);
1309
1310         if (show_filelist_p())
1311                 finish_filelist_progress(flist);
1312
1313         gettimeofday(&end_tv, NULL);
1314         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1315                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1316
1317         if (flist->hlink_pool) {
1318                 pool_destroy(flist->hlink_pool);
1319                 flist->hlink_pool = NULL;
1320         }
1321
1322         /* Sort the list without removing any duplicates.  This allows the
1323          * receiving side to ask for any name they like, which gives us the
1324          * flexibility to change the way we unduplicate names in the future
1325          * without causing a compatibility problem with older versions. */
1326         clean_flist(flist, 0, 0);
1327
1328         send_uid_list(f);
1329
1330         /* send the io_error flag */
1331         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1332
1333         io_end_buffering();
1334         stats.flist_size = stats.total_written - start_write;
1335         stats.num_files = flist->count;
1336
1337         if (verbose > 3)
1338                 output_flist(flist);
1339
1340         if (verbose > 2)
1341                 rprintf(FINFO, "send_file_list done\n");
1342
1343         return flist;
1344 }
1345
1346 struct file_list *recv_file_list(int f)
1347 {
1348         struct file_list *flist;
1349         unsigned short flags;
1350         int64 start_read;
1351
1352         if (show_filelist_p())
1353                 start_filelist_progress("receiving file list");
1354
1355         start_read = stats.total_read;
1356
1357         flist = flist_new(WITH_HLINK, "recv_file_list");
1358
1359         flist->count = 0;
1360         flist->malloced = 1000;
1361         flist->files = new_array(struct file_struct *, flist->malloced);
1362         if (!flist->files)
1363                 goto oom;
1364
1365         while ((flags = read_byte(f)) != 0) {
1366                 struct file_struct *file;
1367
1368                 flist_expand(flist);
1369
1370                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1371                         flags |= read_byte(f) << 8;
1372                 file = receive_file_entry(flist, flags, f);
1373
1374                 if (S_ISREG(file->mode))
1375                         stats.total_size += file->length;
1376
1377                 flist->files[flist->count++] = file;
1378
1379                 maybe_emit_filelist_progress(flist->count);
1380
1381                 if (verbose > 2) {
1382                         rprintf(FINFO, "recv_file_name(%s)\n",
1383                                 f_name(file, NULL));
1384                 }
1385         }
1386         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1387
1388         if (verbose > 2)
1389                 rprintf(FINFO, "received %d names\n", flist->count);
1390
1391         if (show_filelist_p())
1392                 finish_filelist_progress(flist);
1393
1394         clean_flist(flist, relative_paths, 1);
1395
1396         if (f >= 0) {
1397                 recv_uid_list(f, flist);
1398
1399                 /* Recv the io_error flag */
1400                 if (lp_ignore_errors(module_id) || ignore_errors)
1401                         read_int(f);
1402                 else
1403                         io_error |= read_int(f);
1404         }
1405
1406         if (verbose > 3)
1407                 output_flist(flist);
1408
1409         if (list_only) {
1410                 int i;
1411                 for (i = 0; i < flist->count; i++)
1412                         list_file_entry(flist->files[i]);
1413         }
1414
1415         if (verbose > 2)
1416                 rprintf(FINFO, "recv_file_list done\n");
1417
1418         stats.flist_size = stats.total_read - start_read;
1419         stats.num_files = flist->count;
1420
1421         return flist;
1422
1423   oom:
1424         out_of_memory("recv_file_list");
1425         return NULL;            /* not reached */
1426 }
1427
1428 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1429 {
1430         return f_name_cmp(*file1, *file2);
1431 }
1432
1433 /* Search for an identically-named item in the file list.  Note that the
1434  * items must agree in their directory-ness, or no match is returned. */
1435 int flist_find(struct file_list *flist, struct file_struct *f)
1436 {
1437         int low = flist->low, high = flist->high;
1438         int ret, mid, mid_up;
1439
1440         while (low <= high) {
1441                 mid = (low + high) / 2;
1442                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1443                 if (mid_up <= high)
1444                         ret = f_name_cmp(flist->files[mid_up], f);
1445                 else
1446                         ret = 1;
1447                 if (ret == 0) {
1448                         if (protocol_version < 29
1449                             && S_ISDIR(flist->files[mid_up]->mode)
1450                             != S_ISDIR(f->mode))
1451                                 return -1;
1452                         return mid_up;
1453                 }
1454                 if (ret > 0)
1455                         high = mid - 1;
1456                 else
1457                         low = mid_up + 1;
1458         }
1459         return -1;
1460 }
1461
1462 /*
1463  * Free up any resources a file_struct has allocated
1464  * and clear the file.
1465  */
1466 void clear_file(int i, struct file_list *flist)
1467 {
1468         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1469                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1470         memset(flist->files[i], 0, file_struct_len);
1471 }
1472
1473 /*
1474  * allocate a new file list
1475  */
1476 struct file_list *flist_new(int with_hlink, char *msg)
1477 {
1478         struct file_list *flist;
1479
1480         flist = new(struct file_list);
1481         if (!flist)
1482                 out_of_memory(msg);
1483
1484         memset(flist, 0, sizeof (struct file_list));
1485
1486         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1487             out_of_memory, POOL_INTERN)))
1488                 out_of_memory(msg);
1489
1490 #ifdef SUPPORT_HARD_LINKS
1491         if (with_hlink && preserve_hard_links) {
1492                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1493                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1494                         out_of_memory(msg);
1495         }
1496 #endif
1497
1498         return flist;
1499 }
1500
1501 /*
1502  * free up all elements in a flist
1503  */
1504 void flist_free(struct file_list *flist)
1505 {
1506         pool_destroy(flist->file_pool);
1507         pool_destroy(flist->hlink_pool);
1508         free(flist->files);
1509         free(flist);
1510 }
1511
1512 /*
1513  * This routine ensures we don't have any duplicate names in our file list.
1514  * duplicate names can cause corruption because of the pipelining
1515  */
1516 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1517 {
1518         int i, prev_i = 0;
1519
1520         if (!flist)
1521                 return;
1522         if (flist->count == 0) {
1523                 flist->high = -1;
1524                 return;
1525         }
1526
1527         qsort(flist->files, flist->count,
1528             sizeof flist->files[0], (int (*)())file_compare);
1529
1530         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1531                 if (flist->files[i]->basename) {
1532                         prev_i = i;
1533                         break;
1534                 }
1535         }
1536         flist->low = prev_i;
1537         while (++i < flist->count) {
1538                 int j;
1539                 struct file_struct *file = flist->files[i];
1540
1541                 if (!file->basename)
1542                         continue;
1543                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1544                         j = prev_i;
1545                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1546                         int save_mode = file->mode;
1547                         /* Make sure that this directory doesn't duplicate a
1548                          * non-directory earlier in the list. */
1549                         flist->high = prev_i;
1550                         file->mode = S_IFREG;
1551                         j = flist_find(flist, file);
1552                         file->mode = save_mode;
1553                 } else
1554                         j = -1;
1555                 if (j >= 0) {
1556                         struct file_struct *fp = flist->files[j];
1557                         int keep, drop;
1558                         /* If one is a dir and the other is not, we want to
1559                          * keep the dir because it might have contents in the
1560                          * list. */
1561                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1562                                 if (S_ISDIR(file->mode))
1563                                         keep = i, drop = j;
1564                                 else
1565                                         keep = j, drop = i;
1566                         } else
1567                                 keep = j, drop = i;
1568                         if (verbose > 1 && !am_server) {
1569                                 rprintf(FINFO,
1570                                         "removing duplicate name %s from file list (%d)\n",
1571                                         f_name(file, NULL), drop);
1572                         }
1573                         /* Make sure that if we unduplicate '.', that we don't
1574                          * lose track of a user-specified top directory. */
1575                         flist->files[keep]->flags |= flist->files[drop]->flags
1576                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1577
1578                         clear_file(drop, flist);
1579
1580                         if (keep == i) {
1581                                 if (flist->low == drop) {
1582                                         for (j = drop + 1;
1583                                              j < i && !flist->files[j]->basename;
1584                                              j++) {}
1585                                         flist->low = j;
1586                                 }
1587                                 prev_i = i;
1588                         }
1589                 } else
1590                         prev_i = i;
1591         }
1592         flist->high = no_dups ? prev_i : flist->count - 1;
1593
1594         if (strip_root) {
1595                 /* We need to strip off the leading slashes for relative
1596                  * paths, but this must be done _after_ the sorting phase. */
1597                 for (i = flist->low; i <= flist->high; i++) {
1598                         struct file_struct *file = flist->files[i];
1599
1600                         if (!file->dirname)
1601                                 continue;
1602                         if (*file->dirname == '/') {
1603                                 char *s = file->dirname + 1;
1604                                 while (*s == '/') s++;
1605                                 memmove(file->dirname, s, strlen(s) + 1);
1606                         }
1607
1608                         if (!*file->dirname)
1609                                 file->dirname = NULL;
1610                 }
1611         }
1612 }
1613
1614 static void output_flist(struct file_list *flist)
1615 {
1616         char uidbuf[16], gidbuf[16], depthbuf[16];
1617         struct file_struct *file;
1618         const char *who = who_am_i();
1619         int i;
1620
1621         for (i = 0; i < flist->count; i++) {
1622                 file = flist->files[i];
1623                 if ((am_root || am_sender) && preserve_uid)
1624                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1625                 else
1626                         *uidbuf = '\0';
1627                 if (preserve_gid && file->gid != GID_NONE)
1628                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1629                 else
1630                         *gidbuf = '\0';
1631                 if (!am_sender)
1632                         sprintf(depthbuf, "%d", file->dir.depth);
1633                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1634                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1635                         file->dirname ? file->dirname : "",
1636                         file->dirname ? "/" : "", NS(file->basename),
1637                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1638                         (double)file->length, uidbuf, gidbuf, file->flags);
1639         }
1640 }
1641
1642 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1643 enum fnc_type { t_PATH, t_ITEM };
1644
1645 /* Compare the names of two file_struct entities, similar to how strcmp()
1646  * would do if it were operating on the joined strings.
1647  *
1648  * Some differences beginning with protocol_version 29: (1) directory names
1649  * are compared with an assumed trailing slash so that they compare in a
1650  * way that would cause them to sort immediately prior to any content they
1651  * may have; (2) a directory of any name compares after a non-directory of
1652  * any name at the same depth; (3) a directory with name "." compares prior
1653  * to anything else.  These changes mean that a directory and a non-dir
1654  * with the same name will not compare as equal (protocol_version >= 29).
1655  *
1656  * The dirname component can be an empty string, but the basename component
1657  * cannot (and never is in the current codebase).  The basename component
1658  * may be NULL (for a removed item), in which case it is considered to be
1659  * after any existing item. */
1660 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1661 {
1662         int dif;
1663         const uchar *c1, *c2;
1664         enum fnc_state state1, state2;
1665         enum fnc_type type1, type2;
1666         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1667
1668         if (!f1 || !f1->basename) {
1669                 if (!f2 || !f2->basename)
1670                         return 0;
1671                 return -1;
1672         }
1673         if (!f2 || !f2->basename)
1674                 return 1;
1675
1676         c1 = (uchar*)f1->dirname;
1677         c2 = (uchar*)f2->dirname;
1678         if (c1 == c2)
1679                 c1 = c2 = NULL;
1680         if (!c1) {
1681                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1682                 c1 = (uchar*)f1->basename;
1683                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1684                         type1 = t_ITEM;
1685                         state1 = s_TRAILING;
1686                         c1 = (uchar*)"";
1687                 } else
1688                         state1 = s_BASE;
1689         } else if (!*c1) {
1690                 type1 = t_path;
1691                 state1 = s_SLASH;
1692                 c1 = (uchar*)"/";
1693         } else {
1694                 type1 = t_path;
1695                 state1 = s_DIR;
1696         }
1697         if (!c2) {
1698                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1699                 c2 = (uchar*)f2->basename;
1700                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1701                         type2 = t_ITEM;
1702                         state2 = s_TRAILING;
1703                         c2 = (uchar*)"";
1704                 } else
1705                         state2 = s_BASE;
1706         } else if (!*c2) {
1707                 type2 = t_path;
1708                 state2 = s_SLASH;
1709                 c2 = (uchar*)"/";
1710         } else {
1711                 type2 = t_path;
1712                 state2 = s_DIR;
1713         }
1714
1715         if (type1 != type2)
1716                 return type1 == t_PATH ? 1 : -1;
1717
1718         while (1) {
1719                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1720                         break;
1721                 if (!*c1) {
1722                         switch (state1) {
1723                         case s_DIR:
1724                                 state1 = s_SLASH;
1725                                 c1 = (uchar*)"/";
1726                                 break;
1727                         case s_SLASH:
1728                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1729                                 c1 = (uchar*)f1->basename;
1730                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1731                                         type1 = t_ITEM;
1732                                         state1 = s_TRAILING;
1733                                         c1 = (uchar*)"";
1734                                 } else
1735                                         state1 = s_BASE;
1736                                 break;
1737                         case s_BASE:
1738                                 state1 = s_TRAILING;
1739                                 if (type1 == t_PATH) {
1740                                         c1 = (uchar*)"/";
1741                                         break;
1742                                 }
1743                                 /* FALL THROUGH */
1744                         case s_TRAILING:
1745                                 type1 = t_ITEM;
1746                                 break;
1747                         }
1748                         if (*c2 && type1 != type2)
1749                                 return type1 == t_PATH ? 1 : -1;
1750                 }
1751                 if (!*c2) {
1752                         switch (state2) {
1753                         case s_DIR:
1754                                 state2 = s_SLASH;
1755                                 c2 = (uchar*)"/";
1756                                 break;
1757                         case s_SLASH:
1758                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1759                                 c2 = (uchar*)f2->basename;
1760                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1761                                         type2 = t_ITEM;
1762                                         state2 = s_TRAILING;
1763                                         c2 = (uchar*)"";
1764                                 } else
1765                                         state2 = s_BASE;
1766                                 break;
1767                         case s_BASE:
1768                                 state2 = s_TRAILING;
1769                                 if (type2 == t_PATH) {
1770                                         c2 = (uchar*)"/";
1771                                         break;
1772                                 }
1773                                 /* FALL THROUGH */
1774                         case s_TRAILING:
1775                                 if (!*c1)
1776                                         return 0;
1777                                 type2 = t_ITEM;
1778                                 break;
1779                         }
1780                         if (type1 != type2)
1781                                 return type1 == t_PATH ? 1 : -1;
1782                 }
1783         }
1784
1785         return dif;
1786 }
1787
1788 /* Return a copy of the full filename of a flist entry, using the indicated
1789  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1790  * done because we checked the size when creating the file_struct entry.
1791  */
1792 char *f_name(struct file_struct *f, char *fbuf)
1793 {
1794         if (!f || !f->basename)
1795                 return NULL;
1796
1797         if (!fbuf) {
1798                 static char names[5][MAXPATHLEN];
1799                 static unsigned int n;
1800
1801                 n = (n + 1) % (sizeof names / sizeof names[0]);
1802
1803                 fbuf = names[n];
1804         }
1805
1806         if (f->dirname) {
1807                 int len = strlen(f->dirname);
1808                 memcpy(fbuf, f->dirname, len);
1809                 fbuf[len] = '/';
1810                 strcpy(fbuf + len + 1, f->basename);
1811         } else
1812                 strcpy(fbuf, f->basename);
1813
1814         return fbuf;
1815 }
1816
1817 /* Do a non-recursive scan of the named directory, possibly ignoring all
1818  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1819  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1820  * buffer (the functions we call will append names onto the end, but the old
1821  * dir value will be restored on exit). */
1822 struct file_list *get_dirlist(char *dirname, int dlen,
1823                               int ignore_filter_rules)
1824 {
1825         struct file_list *dirlist;
1826         char dirbuf[MAXPATHLEN];
1827         int save_recurse = recurse;
1828
1829         if (dlen < 0) {
1830                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1831                 if (dlen >= MAXPATHLEN)
1832                         return NULL;
1833                 dirname = dirbuf;
1834         }
1835
1836         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1837
1838         recurse = 0;
1839         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1840         recurse = save_recurse;
1841         if (do_progress)
1842                 flist_count_offset += dirlist->count;
1843
1844         clean_flist(dirlist, 0, 0);
1845
1846         if (verbose > 3)
1847                 output_flist(dirlist);
1848
1849         return dirlist;
1850 }