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 struct stats stats;
  31
  32 extern int verbose;
  33 extern int do_progress;
  34 extern int am_root;
  35 extern int am_server;
  36 extern int am_daemon;
  37 extern int am_sender;
  38 extern int always_checksum;
  39 extern int module_id;
  40 extern int ignore_errors;
  41 extern int numeric_ids;
  42
  43 extern int recurse;
  44 extern int xfer_dirs;
  45 extern char curr_dir[MAXPATHLEN];
  46 extern unsigned int curr_dir_len;
  47 extern char *backup_dir;
  48 extern char *backup_suffix;
  49 extern int filesfrom_fd;
  50
  51 extern int one_file_system;
  52 extern int keep_dirlinks;
  53 extern int preserve_links;
  54 extern int preserve_hard_links;
  55 extern int preserve_perms;
  56 extern int preserve_devices;
  57 extern int preserve_uid;
  58 extern int preserve_gid;
  59 extern int relative_paths;
  60 extern int implied_dirs;
  61 extern int make_backups;
  62 extern int backup_suffix_len;
  63 extern int copy_links;
  64 extern int copy_unsafe_links;
  65 extern int protocol_version;
  66 extern int sanitize_paths;
  67 extern int delete_excluded;
  68 extern int max_delete;
  69 extern int orig_umask;
  70 extern int list_only;
  71
  72 extern struct filter_list_struct filter_list;
  73 extern struct filter_list_struct server_filter_list;
  74
  75 int io_error;
  76
  77 static char empty_sum[MD4_SUM_LENGTH];
  78 static unsigned int file_struct_len;
  79 static struct file_list *received_flist;
  80 static dev_t filesystem_dev; /* used to implement -x */
  81 static int deletion_count = 0; /* used to implement --max-delete */
  82
  83 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  84 static void output_flist(struct file_list *flist, const char *whose_list);
  85
  86 void init_flist(void)
  87 {
  88         struct file_struct f;
  89
  90         /* Figure out how big the file_struct is without trailing padding */
  91         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  92 }
  93
  94
  95 static int show_filelist_p(void)
  96 {
  97         return verbose && xfer_dirs && !am_server;
  98 }
  99
 100 static void start_filelist_progress(char *kind)
 101 {
 102         rprintf(FINFO, "%s ... ", kind);
 103         if (verbose > 1 || do_progress)
 104                 rprintf(FINFO, "\n");
 105         rflush(FINFO);
 106 }
 107
 108
 109 static void emit_filelist_progress(const struct file_list *flist)
 110 {
 111         rprintf(FINFO, " %d files...\r", flist->count);
 112 }
 113
 114
 115 static void maybe_emit_filelist_progress(const struct file_list *flist)
 116 {
 117         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
 118                 emit_filelist_progress(flist);
 119 }
 120
 121
 122 static void finish_filelist_progress(const struct file_list *flist)
 123 {
 124         if (do_progress) {
 125                 /* This overwrites the progress line */
 126                 rprintf(FINFO, "%d file%sto consider\n",
 127                         flist->count, flist->count == 1 ? " " : "s ");
 128         } else
 129                 rprintf(FINFO, "done\n");
 130 }
 131
 132 void show_flist_stats(void)
 133 {
 134         /* Nothing yet */
 135 }
 136
 137
 138 static void list_file_entry(struct file_struct *f)
 139 {
 140         char perms[11];
 141
 142         if (!f->basename) {
 143                 /* this can happen if duplicate names were removed */
 144                 return;
 145         }
 146
 147         permstring(perms, f->mode);
 148
 149 #if SUPPORT_LINKS
 150         if (preserve_links && S_ISLNK(f->mode)) {
 151                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 152                         perms,
 153                         (double)f->length, timestring(f->modtime),
 154                         safe_fname(f_name(f)), safe_fname(f->u.link));
 155         } else
 156 #endif
 157         {
 158                 rprintf(FINFO, "%s %11.0f %s %s\n",
 159                         perms,
 160                         (double)f->length, timestring(f->modtime),
 161                         safe_fname(f_name(f)));
 162         }
 163 }
 164
 165
 166 /**
 167  * Stat either a symlink or its referent, depending on the settings of
 168  * copy_links, copy_unsafe_links, etc.
 169  *
 170  * @retval -1 on error
 171  *
 172  * @retval 0 for success
 173  *
 174  * @post If @p path is a symlink, then @p linkbuf (of size @c
 175  * MAXPATHLEN) contains the symlink target.
 176  *
 177  * @post @p buffer contains information about the link or the
 178  * referrent as appropriate, if they exist.
 179  **/
 180 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 181 {
 182 #if SUPPORT_LINKS
 183         if (copy_links)
 184                 return do_stat(path, buffer);
 185         if (link_stat(path, buffer, 0) < 0)
 186                 return -1;
 187         if (S_ISLNK(buffer->st_mode)) {
 188                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 189                 if (l == -1)
 190                         return -1;
 191                 linkbuf[l] = 0;
 192                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 193                         if (verbose > 1) {
 194                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 195                                         safe_fname(path), safe_fname(linkbuf));
 196                         }
 197                         return do_stat(path, buffer);
 198                 }
 199         }
 200         return 0;
 201 #else
 202         return do_stat(path, buffer);
 203 #endif
 204 }
 205
 206 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 207 {
 208 #if SUPPORT_LINKS
 209         if (copy_links)
 210                 return do_stat(path, buffer);
 211         if (do_lstat(path, buffer) < 0)
 212                 return -1;
 213         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 214                 STRUCT_STAT st;
 215                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 216                         *buffer = st;
 217         }
 218         return 0;
 219 #else
 220         return do_stat(path, buffer);
 221 #endif
 222 }
 223
 224 /* This function is used to check if a file should be included/excluded
 225  * from the list of files based on its name and type etc.  The value of
 226  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 227 static int is_excluded(char *fname, int is_dir, int filter_level)
 228 {
 229 #if 0 /* This currently never happens, so avoid a useless compare. */
 230         if (filter_level == NO_FILTERS)
 231                 return 0;
 232 #endif
 233         if (fname) {
 234                 /* never exclude '.', even if somebody does --exclude '*' */
 235                 if (fname[0] == '.' && !fname[1])
 236                         return 0;
 237                 /* Handle the -R version of the '.' dir. */
 238                 if (fname[0] == '/') {
 239                         int len = strlen(fname);
 240                         if (fname[len-1] == '.' && fname[len-2] == '/')
 241                                 return 0;
 242                 }
 243         }
 244         if (server_filter_list.head
 245             && check_filter(&server_filter_list, fname, is_dir) < 0)
 246                 return 1;
 247         if (filter_level != ALL_FILTERS)
 248                 return 0;
 249         if (filter_list.head
 250             && check_filter(&filter_list, fname, is_dir) < 0)
 251                 return 1;
 252         return 0;
 253 }
 254
 255 static int to_wire_mode(mode_t mode)
 256 {
 257 #if SUPPORT_LINKS
 258         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 259                 return (mode & ~(_S_IFMT)) | 0120000;
 260 #endif
 261         return (int)mode;
 262 }
 263
 264 static mode_t from_wire_mode(int mode)
 265 {
 266         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 267                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 268         return (mode_t)mode;
 269 }
 270
 271
 272 static void send_directory(int f, struct file_list *flist,
 273                            char *fbuf, unsigned int offset);
 274
 275 static char *flist_dir;
 276 static int flist_dir_len;
 277
 278
 279 /**
 280  * Make sure @p flist is big enough to hold at least @p flist->count
 281  * entries.
 282  **/
 283 void flist_expand(struct file_list *flist)
 284 {
 285         struct file_struct **new_ptr;
 286
 287         if (flist->count < flist->malloced)
 288                 return;
 289
 290         if (flist->malloced < FLIST_START)
 291                 flist->malloced = FLIST_START;
 292         else if (flist->malloced >= FLIST_LINEAR)
 293                 flist->malloced += FLIST_LINEAR;
 294         else
 295                 flist->malloced *= 2;
 296
 297         /*
 298          * In case count jumped or we are starting the list
 299          * with a known size just set it.
 300          */
 301         if (flist->malloced < flist->count)
 302                 flist->malloced = flist->count;
 303
 304         new_ptr = realloc_array(flist->files, struct file_struct *,
 305                                 flist->malloced);
 306
 307         if (verbose >= 2 && flist->malloced != FLIST_START) {
 308                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 309                     who_am_i(),
 310                     (double)sizeof flist->files[0] * flist->malloced,
 311                     (new_ptr == flist->files) ? " not" : "");
 312         }
 313
 314         flist->files = new_ptr;
 315
 316         if (!flist->files)
 317                 out_of_memory("flist_expand");
 318 }
 319
 320 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 321 {
 322         unsigned short flags;
 323         static time_t modtime;
 324         static mode_t mode;
 325         static int64 dev;
 326         static dev_t rdev;
 327         static uint32 rdev_major;
 328         static uid_t uid;
 329         static gid_t gid;
 330         static char lastname[MAXPATHLEN];
 331         char fname[MAXPATHLEN];
 332         int l1, l2;
 333
 334         if (f == -1)
 335                 return;
 336
 337         if (!file) {
 338                 write_byte(f, 0);
 339                 modtime = 0, mode = 0;
 340                 dev = 0, rdev = makedev(0, 0);
 341                 rdev_major = 0;
 342                 uid = 0, gid = 0;
 343                 *lastname = '\0';
 344                 return;
 345         }
 346
 347         io_write_phase = "send_file_entry";
 348
 349         f_name_to(file, fname);
 350
 351         flags = base_flags;
 352
 353         if (file->mode == mode)
 354                 flags |= XMIT_SAME_MODE;
 355         else
 356                 mode = file->mode;
 357         if (preserve_devices) {
 358                 if (protocol_version < 28) {
 359                         if (IS_DEVICE(mode)) {
 360                                 if (file->u.rdev == rdev)
 361                                         flags |= XMIT_SAME_RDEV_pre28;
 362                                 else
 363                                         rdev = file->u.rdev;
 364                         } else
 365                                 rdev = makedev(0, 0);
 366                 } else if (IS_DEVICE(mode)) {
 367                         rdev = file->u.rdev;
 368                         if ((uint32)major(rdev) == rdev_major)
 369                                 flags |= XMIT_SAME_RDEV_MAJOR;
 370                         else
 371                                 rdev_major = major(rdev);
 372                         if ((uint32)minor(rdev) <= 0xFFu)
 373                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 374                 }
 375         }
 376         if (file->uid == uid)
 377                 flags |= XMIT_SAME_UID;
 378         else
 379                 uid = file->uid;
 380         if (file->gid == gid)
 381                 flags |= XMIT_SAME_GID;
 382         else
 383                 gid = file->gid;
 384         if (file->modtime == modtime)
 385                 flags |= XMIT_SAME_TIME;
 386         else
 387                 modtime = file->modtime;
 388
 389 #if SUPPORT_HARD_LINKS
 390         if (file->link_u.idev) {
 391                 if (file->F_DEV == dev) {
 392                         if (protocol_version >= 28)
 393                                 flags |= XMIT_SAME_DEV;
 394                 } else
 395                         dev = file->F_DEV;
 396                 flags |= XMIT_HAS_IDEV_DATA;
 397         }
 398 #endif
 399
 400         for (l1 = 0;
 401             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 402             l1++) {}
 403         l2 = strlen(fname+l1);
 404
 405         if (l1 > 0)
 406                 flags |= XMIT_SAME_NAME;
 407         if (l2 > 255)
 408                 flags |= XMIT_LONG_NAME;
 409
 410         /* We must make sure we don't send a zero flag byte or the
 411          * other end will terminate the flist transfer.  Note that
 412          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 413          * it's harmless way to add a bit to the first flag byte. */
 414         if (protocol_version >= 28) {
 415                 if (!flags && !S_ISDIR(mode))
 416                         flags |= XMIT_TOP_DIR;
 417                 if ((flags & 0xFF00) || !flags) {
 418                         flags |= XMIT_EXTENDED_FLAGS;
 419                         write_byte(f, flags);
 420                         write_byte(f, flags >> 8);
 421                 } else
 422                         write_byte(f, flags);
 423         } else {
 424                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 425                         flags |= XMIT_TOP_DIR;
 426                 if (!(flags & 0xFF))
 427                         flags |= XMIT_LONG_NAME;
 428                 write_byte(f, flags);
 429         }
 430         if (flags & XMIT_SAME_NAME)
 431                 write_byte(f, l1);
 432         if (flags & XMIT_LONG_NAME)
 433                 write_int(f, l2);
 434         else
 435                 write_byte(f, l2);
 436         write_buf(f, fname + l1, l2);
 437
 438         write_longint(f, file->length);
 439         if (!(flags & XMIT_SAME_TIME))
 440                 write_int(f, modtime);
 441         if (!(flags & XMIT_SAME_MODE))
 442                 write_int(f, to_wire_mode(mode));
 443         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 444                 if (!numeric_ids)
 445                         add_uid(uid);
 446                 write_int(f, uid);
 447         }
 448         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 449                 if (!numeric_ids)
 450                         add_gid(gid);
 451                 write_int(f, gid);
 452         }
 453         if (preserve_devices && IS_DEVICE(mode)) {
 454                 if (protocol_version < 28) {
 455                         if (!(flags & XMIT_SAME_RDEV_pre28))
 456                                 write_int(f, (int)rdev);
 457                 } else {
 458                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 459                                 write_int(f, major(rdev));
 460                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 461                                 write_byte(f, minor(rdev));
 462                         else
 463                                 write_int(f, minor(rdev));
 464                 }
 465         }
 466
 467 #if SUPPORT_LINKS
 468         if (preserve_links && S_ISLNK(mode)) {
 469                 int len = strlen(file->u.link);
 470                 write_int(f, len);
 471                 write_buf(f, file->u.link, len);
 472         }
 473 #endif
 474
 475 #if SUPPORT_HARD_LINKS
 476         if (flags & XMIT_HAS_IDEV_DATA) {
 477                 if (protocol_version < 26) {
 478                         /* 32-bit dev_t and ino_t */
 479                         write_int(f, dev);
 480                         write_int(f, file->F_INODE);
 481                 } else {
 482                         /* 64-bit dev_t and ino_t */
 483                         if (!(flags & XMIT_SAME_DEV))
 484                                 write_longint(f, dev);
 485                         write_longint(f, file->F_INODE);
 486                 }
 487         }
 488 #endif
 489
 490         if (always_checksum) {
 491                 char *sum;
 492                 if (S_ISREG(mode))
 493                         sum = file->u.sum;
 494                 else if (protocol_version < 28) {
 495                         /* Prior to 28, we sent a useless set of nulls. */
 496                         sum = empty_sum;
 497                 } else
 498                         sum = NULL;
 499                 if (sum) {
 500                         write_buf(f, sum,
 501                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 502                 }
 503         }
 504
 505         strlcpy(lastname, fname, MAXPATHLEN);
 506
 507         io_write_phase = "unknown";
 508 }
 509
 510
 511
 512 static void receive_file_entry(struct file_list *flist, int ndx,
 513                                unsigned short flags, int f)
 514 {
 515         static time_t modtime;
 516         static mode_t mode;
 517         static int64 dev;
 518         static dev_t rdev;
 519         static uint32 rdev_major;
 520         static uid_t uid;
 521         static gid_t gid;
 522         static char lastname[MAXPATHLEN], *lastdir;
 523         static int lastdir_depth, lastdir_len = -1;
 524         static unsigned int del_hier_name_len = 0;
 525         static int in_del_hier = 0;
 526         char thisname[MAXPATHLEN];
 527         unsigned int l1 = 0, l2 = 0;
 528         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 529         OFF_T file_length;
 530         char *basename, *dirname, *bp;
 531         struct file_struct *file;
 532
 533         if (!flist) {
 534                 modtime = 0, mode = 0;
 535                 dev = 0, rdev = makedev(0, 0);
 536                 rdev_major = 0;
 537                 uid = 0, gid = 0;
 538                 *lastname = '\0';
 539                 lastdir_len = -1;
 540                 in_del_hier = 0;
 541                 return;
 542         }
 543
 544         if (flags & XMIT_SAME_NAME)
 545                 l1 = read_byte(f);
 546
 547         if (flags & XMIT_LONG_NAME)
 548                 l2 = read_int(f);
 549         else
 550                 l2 = read_byte(f);
 551
 552         if (l2 >= MAXPATHLEN - l1) {
 553                 rprintf(FERROR,
 554                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 555                         flags, l1, l2, safe_fname(lastname));
 556                 overflow("receive_file_entry");
 557         }
 558
 559         strlcpy(thisname, lastname, l1 + 1);
 560         read_sbuf(f, &thisname[l1], l2);
 561         thisname[l1 + l2] = 0;
 562
 563         strlcpy(lastname, thisname, MAXPATHLEN);
 564
 565         clean_fname(thisname, 0);
 566
 567         if (sanitize_paths)
 568                 sanitize_path(thisname, thisname, "", 0);
 569
 570         if ((basename = strrchr(thisname, '/')) != NULL) {
 571                 dirname_len = ++basename - thisname; /* counts future '\0' */
 572                 if (lastdir_len == dirname_len - 1
 573                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 574                         dirname = lastdir;
 575                         dirname_len = 0; /* indicates no copy is needed */
 576                 } else
 577                         dirname = thisname;
 578         } else {
 579                 basename = thisname;
 580                 dirname = NULL;
 581                 dirname_len = 0;
 582         }
 583         basename_len = strlen(basename) + 1; /* count the '\0' */
 584
 585         file_length = read_longint(f);
 586         if (!(flags & XMIT_SAME_TIME))
 587                 modtime = (time_t)read_int(f);
 588         if (!(flags & XMIT_SAME_MODE))
 589                 mode = from_wire_mode(read_int(f));
 590
 591         if (preserve_uid && !(flags & XMIT_SAME_UID))
 592                 uid = (uid_t)read_int(f);
 593         if (preserve_gid && !(flags & XMIT_SAME_GID))
 594                 gid = (gid_t)read_int(f);
 595
 596         if (preserve_devices) {
 597                 if (protocol_version < 28) {
 598                         if (IS_DEVICE(mode)) {
 599                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 600                                         rdev = (dev_t)read_int(f);
 601                         } else
 602                                 rdev = makedev(0, 0);
 603                 } else if (IS_DEVICE(mode)) {
 604                         uint32 rdev_minor;
 605                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 606                                 rdev_major = read_int(f);
 607                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 608                                 rdev_minor = read_byte(f);
 609                         else
 610                                 rdev_minor = read_int(f);
 611                         rdev = makedev(rdev_major, rdev_minor);
 612                 }
 613         }
 614
 615 #if SUPPORT_LINKS
 616         if (preserve_links && S_ISLNK(mode)) {
 617                 linkname_len = read_int(f) + 1; /* count the '\0' */
 618                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 619                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 620                                 linkname_len - 1);
 621                         overflow("receive_file_entry");
 622                 }
 623         }
 624         else
 625 #endif
 626                 linkname_len = 0;
 627
 628         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 629
 630         alloc_len = file_struct_len + dirname_len + basename_len
 631                   + linkname_len + sum_len;
 632         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 633
 634         file = flist->files[ndx] = (struct file_struct *)bp;
 635         memset(bp, 0, file_struct_len);
 636         bp += file_struct_len;
 637
 638         file->flags = 0;
 639         file->modtime = modtime;
 640         file->length = file_length;
 641         file->mode = mode;
 642         file->uid = uid;
 643         file->gid = gid;
 644
 645         if (dirname_len) {
 646                 file->dirname = lastdir = bp;
 647                 lastdir_len = dirname_len - 1;
 648                 memcpy(bp, dirname, dirname_len - 1);
 649                 bp += dirname_len;
 650                 bp[-1] = '\0';
 651                 lastdir_depth = count_dir_elements(lastdir);
 652                 file->dir.depth = lastdir_depth + 1;
 653         } else if (dirname) {
 654                 file->dirname = dirname; /* we're reusing lastname */
 655                 file->dir.depth = lastdir_depth + 1;
 656         } else
 657                 file->dir.depth = 1;
 658
 659         if (S_ISDIR(mode)) {
 660                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 661                         file->dir.depth--;
 662                 if (flags & XMIT_TOP_DIR) {
 663                         in_del_hier = 1;
 664                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 665                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 666                 } else if (in_del_hier) {
 667                         if (!relative_paths || !del_hier_name_len
 668                          || (l1 >= del_hier_name_len
 669                           && thisname[del_hier_name_len] == '/'))
 670                                 file->flags |= FLAG_DEL_HERE;
 671                         else
 672                                 in_del_hier = 0;
 673                 }
 674         }
 675
 676         file->basename = bp;
 677         memcpy(bp, basename, basename_len);
 678         bp += basename_len;
 679
 680         if (preserve_devices && IS_DEVICE(mode))
 681                 file->u.rdev = rdev;
 682
 683 #if SUPPORT_LINKS
 684         if (linkname_len) {
 685                 file->u.link = bp;
 686                 read_sbuf(f, bp, linkname_len - 1);
 687                 if (sanitize_paths)
 688                         sanitize_path(bp, bp, "", lastdir_depth);
 689                 bp += linkname_len;
 690         }
 691 #endif
 692
 693 #if SUPPORT_HARD_LINKS
 694         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 695                 flags |= XMIT_HAS_IDEV_DATA;
 696         if (flags & XMIT_HAS_IDEV_DATA) {
 697                 int64 inode;
 698                 if (protocol_version < 26) {
 699                         dev = read_int(f);
 700                         inode = read_int(f);
 701                 } else {
 702                         if (!(flags & XMIT_SAME_DEV))
 703                                 dev = read_longint(f);
 704                         inode = read_longint(f);
 705                 }
 706                 if (flist->hlink_pool) {
 707                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 708                             struct idev, 1, "inode_table");
 709                         file->F_INODE = inode;
 710                         file->F_DEV = dev;
 711                 }
 712         }
 713 #endif
 714
 715         if (always_checksum) {
 716                 char *sum;
 717                 if (sum_len) {
 718                         file->u.sum = sum = bp;
 719                         /*bp += sum_len;*/
 720                 } else if (protocol_version < 28) {
 721                         /* Prior to 28, we get a useless set of nulls. */
 722                         sum = empty_sum;
 723                 } else
 724                         sum = NULL;
 725                 if (sum) {
 726                         read_buf(f, sum,
 727                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 728                 }
 729         }
 730
 731         if (!preserve_perms) {
 732                 /* set an appropriate set of permissions based on original
 733                  * permissions and umask. This emulates what GNU cp does */
 734                 file->mode &= ~orig_umask;
 735         }
 736 }
 737
 738
 739 /**
 740  * Create a file_struct for a named file by reading its stat()
 741  * information and performing extensive checks against global
 742  * options.
 743  *
 744  * @return the new file, or NULL if there was an error or this file
 745  * should be excluded.
 746  *
 747  * @todo There is a small optimization opportunity here to avoid
 748  * stat()ing the file in some circumstances, which has a certain cost.
 749  * We are called immediately after doing readdir(), and so we may
 750  * already know the d_type of the file.  We could for example avoid
 751  * statting directories if we're not recursing, but this is not a very
 752  * important case.  Some systems may not have d_type.
 753  **/
 754 struct file_struct *make_file(char *fname, struct file_list *flist,
 755                               int filter_level)
 756 {
 757         static char *lastdir;
 758         static int lastdir_len = -1;
 759         struct file_struct *file;
 760         STRUCT_STAT st;
 761         char sum[SUM_LENGTH];
 762         char thisname[MAXPATHLEN];
 763         char linkname[MAXPATHLEN];
 764         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 765         char *basename, *dirname, *bp;
 766         unsigned short flags = 0;
 767
 768         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 769                 lastdir_len = -1;
 770
 771         if (strlcpy(thisname, fname, sizeof thisname)
 772             >= sizeof thisname - flist_dir_len) {
 773                 rprintf(FINFO, "skipping overly long name: %s\n",
 774                         safe_fname(fname));
 775                 return NULL;
 776         }
 777         clean_fname(thisname, 0);
 778         if (sanitize_paths)
 779                 sanitize_path(thisname, thisname, "", 0);
 780
 781         memset(sum, 0, SUM_LENGTH);
 782
 783         if (readlink_stat(thisname, &st, linkname) != 0) {
 784                 int save_errno = errno;
 785                 /* See if file is excluded before reporting an error. */
 786                 if (filter_level != NO_FILTERS
 787                     && is_excluded(thisname, 0, filter_level))
 788                         return NULL;
 789                 if (save_errno == ENOENT) {
 790 #if SUPPORT_LINKS
 791                         /* Avoid "vanished" error if symlink points nowhere. */
 792                         if (copy_links && do_lstat(thisname, &st) == 0
 793                             && S_ISLNK(st.st_mode)) {
 794                                 io_error |= IOERR_GENERAL;
 795                                 rprintf(FERROR, "symlink has no referent: %s\n",
 796                                         full_fname(thisname));
 797                         } else
 798 #endif
 799                         {
 800                                 enum logcode c = am_daemon && protocol_version < 28
 801                                     ? FERROR : FINFO;
 802                                 io_error |= IOERR_VANISHED;
 803                                 rprintf(c, "file has vanished: %s\n",
 804                                         full_fname(thisname));
 805                         }
 806                 } else {
 807                         io_error |= IOERR_GENERAL;
 808                         rsyserr(FERROR, save_errno, "readlink %s failed",
 809                                 full_fname(thisname));
 810                 }
 811                 return NULL;
 812         }
 813
 814         /* backup.c calls us with filter_level set to NO_FILTERS. */
 815         if (filter_level == NO_FILTERS)
 816                 goto skip_filters;
 817
 818         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 819                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
 820                 return NULL;
 821         }
 822
 823         /* We only care about directories because we need to avoid recursing
 824          * into a mount-point directory, not to avoid copying a symlinked
 825          * file if -L (or similar) was specified. */
 826         if (one_file_system && st.st_dev != filesystem_dev
 827             && S_ISDIR(st.st_mode))
 828                 flags |= FLAG_MOUNT_POINT;
 829
 830         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 831                 return NULL;
 832
 833         if (lp_ignore_nonreadable(module_id)) {
 834 #if SUPPORT_LINKS
 835                 if (!S_ISLNK(st.st_mode))
 836 #endif
 837                         if (access(thisname, R_OK) != 0)
 838                                 return NULL;
 839         }
 840
 841 skip_filters:
 842
 843         if (verbose > 2) {
 844                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 845                         who_am_i(), safe_fname(thisname), filter_level);
 846         }
 847
 848         if ((basename = strrchr(thisname, '/')) != NULL) {
 849                 dirname_len = ++basename - thisname; /* counts future '\0' */
 850                 if (lastdir_len == dirname_len - 1
 851                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 852                         dirname = lastdir;
 853                         dirname_len = 0; /* indicates no copy is needed */
 854                 } else
 855                         dirname = thisname;
 856         } else {
 857                 basename = thisname;
 858                 dirname = NULL;
 859                 dirname_len = 0;
 860         }
 861         basename_len = strlen(basename) + 1; /* count the '\0' */
 862
 863 #if SUPPORT_LINKS
 864         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 865 #else
 866         linkname_len = 0;
 867 #endif
 868
 869         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 870
 871         alloc_len = file_struct_len + dirname_len + basename_len
 872             + linkname_len + sum_len;
 873         if (flist) {
 874                 bp = pool_alloc(flist->file_pool, alloc_len,
 875                     "receive_file_entry");
 876         } else {
 877                 if (!(bp = new_array(char, alloc_len)))
 878                         out_of_memory("receive_file_entry");
 879         }
 880
 881         file = (struct file_struct *)bp;
 882         memset(bp, 0, file_struct_len);
 883         bp += file_struct_len;
 884
 885         file->flags = flags;
 886         file->modtime = st.st_mtime;
 887         file->length = st.st_size;
 888         file->mode = st.st_mode;
 889         file->uid = st.st_uid;
 890         file->gid = st.st_gid;
 891
 892 #if SUPPORT_HARD_LINKS
 893         if (flist && flist->hlink_pool) {
 894                 if (protocol_version < 28) {
 895                         if (S_ISREG(st.st_mode))
 896                                 file->link_u.idev = pool_talloc(
 897                                     flist->hlink_pool, struct idev, 1,
 898                                     "inode_table");
 899                 } else {
 900                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 901                                 file->link_u.idev = pool_talloc(
 902                                     flist->hlink_pool, struct idev, 1,
 903                                     "inode_table");
 904                 }
 905         }
 906         if (file->link_u.idev) {
 907                 file->F_DEV = st.st_dev;
 908                 file->F_INODE = st.st_ino;
 909         }
 910 #endif
 911
 912         if (dirname_len) {
 913                 file->dirname = lastdir = bp;
 914                 lastdir_len = dirname_len - 1;
 915                 memcpy(bp, dirname, dirname_len - 1);
 916                 bp += dirname_len;
 917                 bp[-1] = '\0';
 918         } else if (dirname)
 919                 file->dirname = dirname;
 920
 921         file->basename = bp;
 922         memcpy(bp, basename, basename_len);
 923         bp += basename_len;
 924
 925 #if HAVE_STRUCT_STAT_ST_RDEV
 926         if (preserve_devices && IS_DEVICE(st.st_mode))
 927                 file->u.rdev = st.st_rdev;
 928 #endif
 929
 930 #if SUPPORT_LINKS
 931         if (linkname_len) {
 932                 file->u.link = bp;
 933                 memcpy(bp, linkname, linkname_len);
 934                 bp += linkname_len;
 935         }
 936 #endif
 937
 938         if (sum_len) {
 939                 file->u.sum = bp;
 940                 file_checksum(thisname, bp, st.st_size);
 941                 /*bp += sum_len;*/
 942         }
 943
 944         file->dir.root = flist_dir;
 945
 946         /* This code is only used by the receiver when it is building
 947          * a list of files for a delete pass. */
 948         if (keep_dirlinks && linkname_len && flist) {
 949                 STRUCT_STAT st2;
 950                 int i = flist_find(received_flist, file);
 951                 if (i >= 0 && S_ISDIR(received_flist->files[i]->mode)
 952                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 953                         file->modtime = st2.st_mtime;
 954                         file->length = st2.st_size;
 955                         file->mode = st2.st_mode;
 956                         file->uid = st2.st_uid;
 957                         file->gid = st2.st_gid;
 958                         file->u.link = NULL;
 959                         if (file->link_u.idev) {
 960                                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
 961                                 file->link_u.idev = NULL;
 962                         }
 963                 }
 964         }
 965
 966         if (!S_ISDIR(st.st_mode))
 967                 stats.total_size += st.st_size;
 968
 969         return file;
 970 }
 971
 972
 973 void send_file_name(int f, struct file_list *flist, char *fname,
 974                     int recursive, unsigned short base_flags)
 975 {
 976         struct file_struct *file;
 977         char fbuf[MAXPATHLEN];
 978
 979         /* f is set to -1 when calculating deletion file list */
 980         file = make_file(fname, flist,
 981             f == -1 && delete_excluded? SERVER_FILTERS : ALL_FILTERS);
 982
 983         if (!file)
 984                 return;
 985
 986         maybe_emit_filelist_progress(flist);
 987
 988         flist_expand(flist);
 989
 990         if (file->basename[0]) {
 991                 flist->files[flist->count++] = file;
 992                 send_file_entry(file, f, base_flags);
 993         }
 994
 995         if (recursive && S_ISDIR(file->mode)
 996             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 997                 void *save_filters;
 998                 unsigned int len = strlen(fbuf);
 999                 if (len > 1 && fbuf[len-1] == '/')
1000                         fbuf[--len] = '\0';
1001                 if (len >= MAXPATHLEN - 1) {
1002                         io_error |= IOERR_GENERAL;
1003                         rprintf(FERROR, "skipping long-named directory: %s\n",
1004                                 full_fname(fbuf));
1005                         return;
1006                 }
1007                 save_filters = push_local_filters(fbuf, len);
1008                 send_directory(f, flist, fbuf, len);
1009                 pop_local_filters(save_filters);
1010         }
1011 }
1012
1013
1014 /* Note that the "recurse" value either contains -1, for infinite recursion,
1015  * or a number >= 0 indicating how many levels of recursion we will allow.
1016  * This function is normally called by the sender, but the receiving side
1017  * also calls it from delete_in_dir() with f set to -1 so that we just
1018  * construct the file list in memory without sending it over the wire. */
1019 static void send_directory(int f, struct file_list *flist,
1020                            char *fbuf, unsigned int len)
1021 {
1022         struct dirent *di;
1023         char *p;
1024         DIR *d;
1025
1026         if (!(d = opendir(fbuf))) {
1027                 io_error |= IOERR_GENERAL;
1028                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1029                 return;
1030         }
1031
1032         p = fbuf + len;
1033         if (len != 1 || *fbuf != '/')
1034                 *p++ = '/';
1035         *p = '\0';
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, MAXPATHLEN - len) < MAXPATHLEN - len) {
1043                         int do_subdirs = recurse >= 1 ? recurse-- : recurse;
1044                         send_file_name(f, flist, fbuf, do_subdirs, 0);
1045                 } else {
1046                         io_error |= IOERR_GENERAL;
1047                         rprintf(FINFO,
1048                                 "cannot send long-named file %s\n",
1049                                 full_fname(fbuf));
1050                 }
1051         }
1052         if (errno) {
1053                 io_error |= IOERR_GENERAL;
1054                 *p = '\0';
1055                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1056         }
1057
1058         closedir(d);
1059 }
1060
1061
1062 struct file_list *send_file_list(int f, int argc, char *argv[])
1063 {
1064         int l;
1065         STRUCT_STAT st;
1066         char *p, *dir, olddir[sizeof curr_dir];
1067         char lastpath[MAXPATHLEN] = "";
1068         struct file_list *flist;
1069         struct timeval start_tv, end_tv;
1070         int64 start_write;
1071         int use_ff_fd = 0;
1072
1073         if (show_filelist_p())
1074                 start_filelist_progress("building file list");
1075
1076         start_write = stats.total_written;
1077         gettimeofday(&start_tv, NULL);
1078
1079         flist = flist_new(WITH_HLINK, "send_file_list");
1080
1081         io_start_buffering_out();
1082         if (filesfrom_fd >= 0) {
1083                 if (argv[0] && !push_dir(argv[0])) {
1084                         rsyserr(FERROR, errno, "push_dir %s failed",
1085                                 full_fname(argv[0]));
1086                         exit_cleanup(RERR_FILESELECT);
1087                 }
1088                 use_ff_fd = 1;
1089         }
1090
1091         while (1) {
1092                 char fname2[MAXPATHLEN];
1093                 char *fname = fname2;
1094                 int do_subdirs;
1095
1096                 if (use_ff_fd) {
1097                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1098                                 break;
1099                         sanitize_path(fname, fname, "", 0);
1100                 } else {
1101                         if (argc-- == 0)
1102                                 break;
1103                         strlcpy(fname, *argv++, MAXPATHLEN);
1104                         if (sanitize_paths)
1105                                 sanitize_path(fname, fname, "", 0);
1106                 }
1107
1108                 l = strlen(fname);
1109                 if (!l || fname[l - 1] == '/') {
1110                         if (l == 2 && fname[0] == '.') {
1111                                 /* Turn "./" into just "." rather than "./." */
1112                                 fname[1] = '\0';
1113                         } else if (l < MAXPATHLEN) {
1114                                 fname[l++] = '.';
1115                                 fname[l] = '\0';
1116                         }
1117                 }
1118                 if (fname[l-1] == '.' && (l == 1 || fname[l-2] == '/')) {
1119                         if (!recurse && xfer_dirs)
1120                                 recurse = 1; /* allow one level */
1121                 } else if (recurse > 0)
1122                         recurse = 0;
1123
1124                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1125                         io_error |= IOERR_GENERAL;
1126                         rsyserr(FERROR, errno, "link_stat %s failed",
1127                                 full_fname(fname));
1128                         continue;
1129                 }
1130
1131                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1132                         rprintf(FINFO, "skipping directory %s\n",
1133                                 safe_fname(fname));
1134                         continue;
1135                 }
1136
1137                 dir = NULL;
1138                 olddir[0] = '\0';
1139
1140                 if (!relative_paths) {
1141                         p = strrchr(fname, '/');
1142                         if (p) {
1143                                 *p = 0;
1144                                 if (p == fname)
1145                                         dir = "/";
1146                                 else
1147                                         dir = fname;
1148                                 fname = p + 1;
1149                         }
1150                 } else if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1151                         /* this ensures we send the intermediate directories,
1152                            thus getting their permissions right */
1153                         char *lp = lastpath, *fn = fname, *slash = fname;
1154                         *p = 0;
1155                         /* Skip any initial directories in our path that we
1156                          * have in common with lastpath. */
1157                         while (*fn && *lp == *fn) {
1158                                 if (*fn == '/')
1159                                         slash = fn;
1160                                 lp++, fn++;
1161                         }
1162                         *p = '/';
1163                         if (fn != p || (*lp && *lp != '/')) {
1164                                 int save_copy_links = copy_links;
1165                                 int save_xfer_dirs = xfer_dirs;
1166                                 copy_links = copy_unsafe_links;
1167                                 xfer_dirs = 1;
1168                                 while ((slash = strchr(slash+1, '/')) != 0) {
1169                                         *slash = 0;
1170                                         send_file_name(f, flist, fname, 0, 0);
1171                                         *slash = '/';
1172                                 }
1173                                 copy_links = save_copy_links;
1174                                 xfer_dirs = save_xfer_dirs;
1175                                 *p = 0;
1176                                 strlcpy(lastpath, fname, sizeof lastpath);
1177                                 *p = '/';
1178                         }
1179                 }
1180
1181                 if (!*fname)
1182                         fname = ".";
1183
1184                 if (dir && *dir) {
1185                         static char *lastdir;
1186                         static int lastdir_len;
1187
1188                         strcpy(olddir, curr_dir); /* can't overflow */
1189
1190                         if (!push_dir(dir)) {
1191                                 io_error |= IOERR_GENERAL;
1192                                 rsyserr(FERROR, errno, "push_dir %s failed",
1193                                         full_fname(dir));
1194                                 continue;
1195                         }
1196
1197                         if (lastdir && strcmp(lastdir, dir) == 0) {
1198                                 flist_dir = lastdir;
1199                                 flist_dir_len = lastdir_len;
1200                         } else {
1201                                 flist_dir = lastdir = strdup(dir);
1202                                 flist_dir_len = lastdir_len = strlen(dir);
1203                         }
1204                 }
1205
1206                 if (one_file_system)
1207                         filesystem_dev = st.st_dev;
1208
1209                 do_subdirs = recurse >= 1 ? recurse-- : recurse;
1210                 send_file_name(f, flist, fname, do_subdirs, XMIT_TOP_DIR);
1211
1212                 if (olddir[0]) {
1213                         flist_dir = NULL;
1214                         flist_dir_len = 0;
1215                         if (!pop_dir(olddir)) {
1216                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1217                                         full_fname(dir));
1218                                 exit_cleanup(RERR_FILESELECT);
1219                         }
1220                 }
1221         }
1222
1223         gettimeofday(&end_tv, NULL);
1224         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1225                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1226         if (stats.flist_buildtime == 0)
1227                 stats.flist_buildtime = 1;
1228         start_tv = end_tv;
1229
1230         send_file_entry(NULL, f, 0);
1231
1232         if (show_filelist_p())
1233                 finish_filelist_progress(flist);
1234
1235         gettimeofday(&end_tv, NULL);
1236         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1237                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1238
1239         if (flist->hlink_pool) {
1240                 pool_destroy(flist->hlink_pool);
1241                 flist->hlink_pool = NULL;
1242         }
1243
1244         clean_flist(flist, 0, 0);
1245
1246         /* Now send the uid/gid list. This was introduced in
1247          * protocol version 15 */
1248         send_uid_list(f);
1249
1250         /* send the io_error flag */
1251         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1252
1253         io_end_buffering();
1254         stats.flist_size = stats.total_written - start_write;
1255         stats.num_files = flist->count;
1256
1257         if (verbose > 3)
1258                 output_flist(flist, who_am_i());
1259
1260         if (verbose > 2)
1261                 rprintf(FINFO, "send_file_list done\n");
1262
1263         return flist;
1264 }
1265
1266
1267 struct file_list *recv_file_list(int f)
1268 {
1269         struct file_list *flist;
1270         unsigned short flags;
1271         int64 start_read;
1272
1273         if (show_filelist_p())
1274                 start_filelist_progress("receiving file list");
1275
1276         start_read = stats.total_read;
1277
1278         flist = flist_new(WITH_HLINK, "recv_file_list");
1279         received_flist = flist;
1280
1281         flist->count = 0;
1282         flist->malloced = 1000;
1283         flist->files = new_array(struct file_struct *, flist->malloced);
1284         if (!flist->files)
1285                 goto oom;
1286
1287
1288         while ((flags = read_byte(f)) != 0) {
1289                 int i = flist->count;
1290
1291                 flist_expand(flist);
1292
1293                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1294                         flags |= read_byte(f) << 8;
1295                 receive_file_entry(flist, i, flags, f);
1296
1297                 if (S_ISREG(flist->files[i]->mode))
1298                         stats.total_size += flist->files[i]->length;
1299
1300                 flist->count++;
1301
1302                 maybe_emit_filelist_progress(flist);
1303
1304                 if (verbose > 2) {
1305                         rprintf(FINFO, "recv_file_name(%s)\n",
1306                                 safe_fname(f_name(flist->files[i])));
1307                 }
1308         }
1309         receive_file_entry(NULL, 0, 0, 0); /* Signal that we're done. */
1310
1311         if (verbose > 2)
1312                 rprintf(FINFO, "received %d names\n", flist->count);
1313
1314         if (show_filelist_p())
1315                 finish_filelist_progress(flist);
1316
1317         clean_flist(flist, relative_paths, 1);
1318
1319         if (f != -1) {
1320                 /* Now send the uid/gid list. This was introduced in
1321                  * protocol version 15 */
1322                 recv_uid_list(f, flist);
1323
1324                 /* Recv the io_error flag */
1325                 if (lp_ignore_errors(module_id) || ignore_errors)
1326                         read_int(f);
1327                 else
1328                         io_error |= read_int(f);
1329         }
1330
1331         if (verbose > 3)
1332                 output_flist(flist, who_am_i());
1333
1334         if (list_only) {
1335                 int i;
1336                 for (i = 0; i < flist->count; i++)
1337                         list_file_entry(flist->files[i]);
1338         }
1339
1340         if (verbose > 2)
1341                 rprintf(FINFO, "recv_file_list done\n");
1342
1343         stats.flist_size = stats.total_read - start_read;
1344         stats.num_files = flist->count;
1345
1346         return flist;
1347
1348 oom:
1349         out_of_memory("recv_file_list");
1350         return NULL;            /* not reached */
1351 }
1352
1353
1354 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1355 {
1356         return f_name_cmp(*file1, *file2);
1357 }
1358
1359
1360 int flist_find(struct file_list *flist, struct file_struct *f)
1361 {
1362         int low = flist->low, high = flist->high;
1363         int ret, mid, mid_up;
1364
1365         while (low <= high) {
1366                 mid = (low + high) / 2;
1367                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1368                 if (mid_up <= high)
1369                         ret = f_name_cmp(flist->files[mid_up], f);
1370                 else
1371                         ret = 1;
1372                 if (ret == 0)
1373                         return mid_up;
1374                 if (ret > 0)
1375                         high = mid - 1;
1376                 else
1377                         low = mid_up + 1;
1378         }
1379         return -1;
1380 }
1381
1382 /*
1383  * Free up any resources a file_struct has allocated
1384  * and clear the file.
1385  */
1386 void clear_file(int i, struct file_list *flist)
1387 {
1388         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1389                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1390         memset(flist->files[i], 0, file_struct_len);
1391 }
1392
1393
1394 /*
1395  * allocate a new file list
1396  */
1397 struct file_list *flist_new(int with_hlink, char *msg)
1398 {
1399         struct file_list *flist;
1400
1401         flist = new(struct file_list);
1402         if (!flist)
1403                 out_of_memory(msg);
1404
1405         memset(flist, 0, sizeof (struct file_list));
1406
1407         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1408             out_of_memory, POOL_INTERN)))
1409                 out_of_memory(msg);
1410
1411 #if SUPPORT_HARD_LINKS
1412         if (with_hlink && preserve_hard_links) {
1413                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1414                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1415                         out_of_memory(msg);
1416         }
1417 #endif
1418
1419         return flist;
1420 }
1421
1422 /*
1423  * free up all elements in a flist
1424  */
1425 void flist_free(struct file_list *flist)
1426 {
1427         pool_destroy(flist->file_pool);
1428         pool_destroy(flist->hlink_pool);
1429         free(flist->files);
1430         free(flist);
1431 }
1432
1433
1434 /*
1435  * This routine ensures we don't have any duplicate names in our file list.
1436  * duplicate names can cause corruption because of the pipelining
1437  */
1438 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1439 {
1440         int i, prev_i = 0;
1441
1442         if (!flist || flist->count == 0)
1443                 return;
1444
1445         qsort(flist->files, flist->count,
1446             sizeof flist->files[0], (int (*)())file_compare);
1447
1448         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1449                 if (flist->files[i]->basename) {
1450                         prev_i = i;
1451                         break;
1452                 }
1453         }
1454         flist->low = prev_i;
1455         while (++i < flist->count) {
1456                 if (!flist->files[i]->basename)
1457                         continue;
1458                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1459                         if (verbose > 1 && !am_server) {
1460                                 rprintf(FINFO,
1461                                         "removing duplicate name %s from file list %d\n",
1462                                         safe_fname(f_name(flist->files[i])), i);
1463                         }
1464                         /* Make sure that if we unduplicate '.', that we don't
1465                          * lose track of a user-specified top directory. */
1466                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1467                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1468
1469                         clear_file(i, flist);
1470                 } else
1471                         prev_i = i;
1472         }
1473         flist->high = prev_i;
1474
1475         if (strip_root) {
1476                 /* we need to strip off the root directory in the case
1477                    of relative paths, but this must be done _after_
1478                    the sorting phase */
1479                 for (i = 0; i < flist->count; i++) {
1480                         if (flist->files[i]->dirname &&
1481                             flist->files[i]->dirname[0] == '/') {
1482                                 memmove(&flist->files[i]->dirname[0],
1483                                         &flist->files[i]->dirname[1],
1484                                         strlen(flist->files[i]->dirname));
1485                         }
1486
1487                         if (flist->files[i]->dirname &&
1488                             !flist->files[i]->dirname[0]) {
1489                                 flist->files[i]->dirname = NULL;
1490                         }
1491                 }
1492         }
1493 }
1494
1495 static void output_flist(struct file_list *flist, const char *whose_list)
1496 {
1497         char uidbuf[16], gidbuf[16], depthbuf[16];
1498         struct file_struct *file;
1499         int i;
1500
1501         for (i = 0; i < flist->count; i++) {
1502                 file = flist->files[i];
1503                 if ((am_root || am_sender) && preserve_uid)
1504                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1505                 else
1506                         *uidbuf = '\0';
1507                 if (preserve_gid && file->gid != GID_NONE)
1508                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1509                 else
1510                         *gidbuf = '\0';
1511                 if (!am_sender)
1512                         sprintf(depthbuf, "%d", file->dir.depth);
1513                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1514                         whose_list, i, am_sender ? NS(file->dir.root) : depthbuf,
1515                         file->dirname ? safe_fname(file->dirname) : "",
1516                         file->dirname ? "/" : "", NS(file->basename),
1517                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1518                         (double)file->length, uidbuf, gidbuf, file->flags);
1519         }
1520 }
1521
1522
1523 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE, fnc_TRAILING };
1524
1525 /* Compare the names of two file_struct entities, similar to how strcmp()
1526  * would do if it were operating on the joined strings.  The only difference
1527  * is that, beginning with protocol_version 29, a directory name will always
1528  * sort immediately prior to its contents (previously "foo." would sort in
1529  * between directory "foo" and "foo/bar").  We do this by assuming that a dir
1530  * has a trailing slash for comparison purposes, but only if we aren't about
1531  * to match a file of the same name (because we need all identically named
1532  * items to match each other).  The dirname component can be an empty string,
1533  * but the basename component cannot (and never is in the current codebase).
1534  * The basename component may be NULL, in which case it is sorted to the end
1535  * of the list (as a removed item). */
1536 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1537 {
1538         int dif;
1539         const uchar *c1, *c2;
1540         enum fnc_state state1, state2;
1541
1542         if (!f1 || !f1->basename) {
1543                 if (!f2 || !f2->basename)
1544                         return 0;
1545                 return -1;
1546         }
1547         if (!f2 || !f2->basename)
1548                 return 1;
1549
1550         c1 = (uchar*)f1->dirname;
1551         c2 = (uchar*)f2->dirname;
1552         if (c1 == c2)
1553                 c1 = c2 = NULL;
1554         if (!c1) {
1555                 state1 = fnc_BASE;
1556                 c1 = (uchar*)f1->basename;
1557         } else if (!*c1) {
1558                 state1 = fnc_SLASH;
1559                 c1 = (uchar*)"/";
1560         } else
1561                 state1 = fnc_DIR;
1562         if (!c2) {
1563                 state2 = fnc_BASE;
1564                 c2 = (uchar*)f2->basename;
1565         } else if (!*c2) {
1566                 state2 = fnc_SLASH;
1567                 c2 = (uchar*)"/";
1568         } else
1569                 state2 = fnc_DIR;
1570
1571         while (1) {
1572                 if ((dif = (int)*c1 - (int)*c2) != 0)
1573                         break;
1574                 if (!*++c1) {
1575                         switch (state1) {
1576                         case fnc_DIR:
1577                                 state1 = fnc_SLASH;
1578                                 c1 = (uchar*)"/";
1579                                 break;
1580                         case fnc_SLASH:
1581                                 state1 = fnc_BASE;
1582                                 c1 = (uchar*)f1->basename;
1583                                 break;
1584                         case fnc_BASE:
1585                                 state1 = fnc_TRAILING;
1586                                 if (protocol_version >= 29 && S_ISDIR(f1->mode))
1587                                         c1 = (uchar*)"/";
1588                                 break;
1589                         case fnc_TRAILING:
1590                                 break;
1591                         }
1592                 }
1593                 if (!*++c2) {
1594                         switch (state2) {
1595                         case fnc_DIR:
1596                                 state2 = fnc_SLASH;
1597                                 c2 = (uchar*)"/";
1598                                 break;
1599                         case fnc_SLASH:
1600                                 state2 = fnc_BASE;
1601                                 c2 = (uchar*)f2->basename;
1602                                 break;
1603                         case fnc_BASE:
1604                                 if (state1 == fnc_TRAILING)
1605                                         return 0;
1606                                 state2 = fnc_TRAILING;
1607                                 if (protocol_version >= 29 && S_ISDIR(f2->mode))
1608                                         c2 = (uchar*)"/";
1609                                 break;
1610                         case fnc_TRAILING:
1611                                 break;
1612                         }
1613                 }
1614         }
1615
1616         return dif;
1617 }
1618
1619
1620 /* Return a copy of the full filename of a flist entry, using the indicated
1621  * buffer.  No size-checking is done because we checked the size when creating
1622  * the file_struct entry.
1623  */
1624 char *f_name_to(struct file_struct *f, char *fbuf)
1625 {
1626         if (!f || !f->basename)
1627                 return NULL;
1628
1629         if (f->dirname) {
1630                 int len = strlen(f->dirname);
1631                 memcpy(fbuf, f->dirname, len);
1632                 fbuf[len] = '/';
1633                 strcpy(fbuf + len + 1, f->basename);
1634         } else
1635                 strcpy(fbuf, f->basename);
1636         return fbuf;
1637 }
1638
1639
1640 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1641 char *f_name(struct file_struct *f)
1642 {
1643         static char names[5][MAXPATHLEN];
1644         static unsigned int n;
1645
1646         n = (n + 1) % (sizeof names / sizeof names[0]);
1647
1648         return f_name_to(f, names[n]);
1649 }
1650
1651
1652 static int is_backup_file(char *fn)
1653 {
1654         int k = strlen(fn) - backup_suffix_len;
1655         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
1656 }
1657
1658
1659 /* This function is used to implement per-directory deletion, and
1660  * is used by all the --delete-WHEN options.  Note that the fbuf
1661  * pointer must point to a MAXPATHLEN buffer with the name of the
1662  * directory in it (the functions we call will append names onto
1663  * the end, but the old dir value will be restored on exit). */
1664 void delete_in_dir(struct file_list *flist, char *fbuf,
1665                    struct file_struct *file)
1666 {
1667         static int min_depth = MAXPATHLEN, cur_depth = -1;
1668         static void *filt_array[MAXPATHLEN/2+1];
1669         struct file_list *dir_list;
1670         STRUCT_STAT st;
1671         int dlen;
1672
1673         if (!flist) {
1674                 while (cur_depth >= min_depth)
1675                         pop_local_filters(filt_array[cur_depth--]);
1676                 min_depth = MAXPATHLEN;
1677                 cur_depth = -1;
1678                 return;
1679         }
1680         if (file->dir.depth >= MAXPATHLEN/2+1)
1681                 return; /* Impossible... */
1682
1683         if (max_delete && deletion_count >= max_delete)
1684                 return;
1685
1686         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
1687                 rprintf(FINFO,
1688                         "IO error encountered -- skipping file deletion\n");
1689                 max_delete = -1; /* avoid duplicating the above warning */
1690                 return;
1691         }
1692
1693         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
1694                 pop_local_filters(filt_array[cur_depth--]);
1695         cur_depth = file->dir.depth;
1696         if (min_depth > cur_depth)
1697                 min_depth = cur_depth;
1698         dlen = strlen(fbuf);
1699         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
1700
1701         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
1702                 return;
1703
1704         if (one_file_system && file->flags & FLAG_TOP_DIR)
1705                 filesystem_dev = st.st_dev;
1706
1707         dir_list = flist_new(WITHOUT_HLINK, "delete_in_dir");
1708
1709         recurse = 0;
1710         send_directory(-1, dir_list, fbuf, dlen);
1711         recurse = -1;
1712         fbuf[dlen] = '\0';
1713
1714         if (verbose > 3)
1715                 output_flist(dir_list, "delete");
1716
1717         delete_missing(flist, dir_list, fbuf);
1718
1719         flist_free(dir_list);
1720 }
1721
1722
1723 /* If an item in dir_list is not found in full_list, delete it from the
1724  * filesystem. */
1725 void delete_missing(struct file_list *full_list, struct file_list *dir_list,
1726                     const char *dirname)
1727 {
1728         int i, j, mode;
1729
1730         if (max_delete && deletion_count >= max_delete)
1731                 return;
1732
1733         if (verbose > 2)
1734                 rprintf(FINFO, "delete_missing(%s)\n", safe_fname(dirname));
1735
1736         for (i = dir_list->count; i--; ) {
1737                 if (!dir_list->files[i]->basename)
1738                         continue;
1739                 mode = dir_list->files[i]->mode;
1740                 if ((j = flist_find(full_list, dir_list->files[i])) < 0
1741                     || (S_ISDIR(mode) && !S_ISDIR(full_list->files[j]->mode))) {
1742                         char *f = f_name(dir_list->files[i]);
1743                         if (make_backups && (backup_dir || !is_backup_file(f))
1744                           && !S_ISDIR(mode)) {
1745                                 make_backup(f);
1746                                 if (verbose) {
1747                                         rprintf(FINFO, "deleting %s\n",
1748                                                 safe_fname(f));
1749                                 }
1750                         } else if (S_ISDIR(mode))
1751                                 delete_file(f, DEL_DIR | DEL_FORCE_RECURSE);
1752                         else
1753                                 delete_file(f, 0);
1754                         deletion_count++;
1755                         if (max_delete && deletion_count >= max_delete)
1756                                 break;
1757                 }
1758         }
1759 }