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 dry_run;
  34 extern int list_only;
  35 extern int am_root;
  36 extern int am_server;
  37 extern int am_daemon;
  38 extern int am_sender;
  39 extern int do_progress;
  40 extern int always_checksum;
  41 extern int module_id;
  42 extern int ignore_errors;
  43 extern int numeric_ids;
  44 extern int recurse;
  45 extern int xfer_dirs;
  46 extern int filesfrom_fd;
  47 extern int one_file_system;
  48 extern int keep_dirlinks;
  49 extern int preserve_links;
  50 extern int preserve_hard_links;
  51 extern int preserve_perms;
  52 extern int preserve_devices;
  53 extern int preserve_uid;
  54 extern int preserve_gid;
  55 extern int relative_paths;
  56 extern int implied_dirs;
  57 extern int copy_links;
  58 extern int copy_unsafe_links;
  59 extern int protocol_version;
  60 extern int sanitize_paths;
  61 extern int max_delete;
  62 extern int force_delete;
  63 extern int orig_umask;
  64 extern int make_backups;
  65 extern unsigned int curr_dir_len;
  66 extern char *log_format;
  67 extern char *backup_dir;
  68 extern char *backup_suffix;
  69 extern int backup_suffix_len;
  70
  71 extern char curr_dir[MAXPATHLEN];
  72
  73 extern struct filter_list_struct filter_list;
  74 extern struct filter_list_struct server_filter_list;
  75
  76 int io_error;
  77
  78 static char empty_sum[MD4_SUM_LENGTH];
  79 static unsigned int file_struct_len;
  80 static struct file_list *received_flist, *sorting_flist;
  81 static dev_t filesystem_dev; /* used to implement -x */
  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 #ifdef 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 #ifdef 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 #ifdef 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 #ifdef 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 < 0)
 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 #ifdef 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 #ifdef 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 #ifdef 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 struct file_struct *receive_file_entry(struct file_list *flist,
 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 NULL;
 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 #ifdef 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 = (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 #ifdef 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 #ifdef 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         return file;
 738 }
 739
 740
 741 /**
 742  * Create a file_struct for a named file by reading its stat()
 743  * information and performing extensive checks against global
 744  * options.
 745  *
 746  * @return the new file, or NULL if there was an error or this file
 747  * should be excluded.
 748  *
 749  * @todo There is a small optimization opportunity here to avoid
 750  * stat()ing the file in some circumstances, which has a certain cost.
 751  * We are called immediately after doing readdir(), and so we may
 752  * already know the d_type of the file.  We could for example avoid
 753  * statting directories if we're not recursing, but this is not a very
 754  * important case.  Some systems may not have d_type.
 755  **/
 756 struct file_struct *make_file(char *fname, struct file_list *flist,
 757                               int filter_level)
 758 {
 759         static char *lastdir;
 760         static int lastdir_len = -1;
 761         struct file_struct *file;
 762         STRUCT_STAT st;
 763         char sum[SUM_LENGTH];
 764         char thisname[MAXPATHLEN];
 765         char linkname[MAXPATHLEN];
 766         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 767         char *basename, *dirname, *bp;
 768         unsigned short flags = 0;
 769
 770         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 771                 lastdir_len = -1;
 772
 773         if (strlcpy(thisname, fname, sizeof thisname)
 774             >= sizeof thisname - flist_dir_len) {
 775                 rprintf(FINFO, "skipping overly long name: %s\n",
 776                         safe_fname(fname));
 777                 return NULL;
 778         }
 779         clean_fname(thisname, 0);
 780         if (sanitize_paths)
 781                 sanitize_path(thisname, thisname, "", 0);
 782
 783         memset(sum, 0, SUM_LENGTH);
 784
 785         if (readlink_stat(thisname, &st, linkname) != 0) {
 786                 int save_errno = errno;
 787                 /* See if file is excluded before reporting an error. */
 788                 if (filter_level != NO_FILTERS
 789                     && is_excluded(thisname, 0, filter_level))
 790                         return NULL;
 791                 if (save_errno == ENOENT) {
 792 #ifdef SUPPORT_LINKS
 793                         /* Avoid "vanished" error if symlink points nowhere. */
 794                         if (copy_links && do_lstat(thisname, &st) == 0
 795                             && S_ISLNK(st.st_mode)) {
 796                                 io_error |= IOERR_GENERAL;
 797                                 rprintf(FERROR, "symlink has no referent: %s\n",
 798                                         full_fname(thisname));
 799                         } else
 800 #endif
 801                         {
 802                                 enum logcode c = am_daemon && protocol_version < 28
 803                                     ? FERROR : FINFO;
 804                                 io_error |= IOERR_VANISHED;
 805                                 rprintf(c, "file has vanished: %s\n",
 806                                         full_fname(thisname));
 807                         }
 808                 } else {
 809                         io_error |= IOERR_GENERAL;
 810                         rsyserr(FERROR, save_errno, "readlink %s failed",
 811                                 full_fname(thisname));
 812                 }
 813                 return NULL;
 814         }
 815
 816         /* backup.c calls us with filter_level set to NO_FILTERS. */
 817         if (filter_level == NO_FILTERS)
 818                 goto skip_filters;
 819
 820         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 821                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
 822                 return NULL;
 823         }
 824
 825         /* We only care about directories because we need to avoid recursing
 826          * into a mount-point directory, not to avoid copying a symlinked
 827          * file if -L (or similar) was specified. */
 828         if (one_file_system && st.st_dev != filesystem_dev
 829             && S_ISDIR(st.st_mode))
 830                 flags |= FLAG_MOUNT_POINT;
 831
 832         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 833                 return NULL;
 834
 835         if (lp_ignore_nonreadable(module_id)) {
 836 #ifdef SUPPORT_LINKS
 837                 if (!S_ISLNK(st.st_mode))
 838 #endif
 839                         if (access(thisname, R_OK) != 0)
 840                                 return NULL;
 841         }
 842
 843 skip_filters:
 844
 845         if (verbose > 2) {
 846                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 847                         who_am_i(), safe_fname(thisname), filter_level);
 848         }
 849
 850         if ((basename = strrchr(thisname, '/')) != NULL) {
 851                 dirname_len = ++basename - thisname; /* counts future '\0' */
 852                 if (lastdir_len == dirname_len - 1
 853                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 854                         dirname = lastdir;
 855                         dirname_len = 0; /* indicates no copy is needed */
 856                 } else
 857                         dirname = thisname;
 858         } else {
 859                 basename = thisname;
 860                 dirname = NULL;
 861                 dirname_len = 0;
 862         }
 863         basename_len = strlen(basename) + 1; /* count the '\0' */
 864
 865 #ifdef SUPPORT_LINKS
 866         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 867 #else
 868         linkname_len = 0;
 869 #endif
 870
 871         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 872
 873         alloc_len = file_struct_len + dirname_len + basename_len
 874             + linkname_len + sum_len;
 875         if (flist) {
 876                 bp = pool_alloc(flist->file_pool, alloc_len,
 877                     "receive_file_entry");
 878         } else {
 879                 if (!(bp = new_array(char, alloc_len)))
 880                         out_of_memory("receive_file_entry");
 881         }
 882
 883         file = (struct file_struct *)bp;
 884         memset(bp, 0, file_struct_len);
 885         bp += file_struct_len;
 886
 887         file->flags = flags;
 888         file->modtime = st.st_mtime;
 889         file->length = st.st_size;
 890         file->mode = st.st_mode;
 891         file->uid = st.st_uid;
 892         file->gid = st.st_gid;
 893
 894 #ifdef SUPPORT_HARD_LINKS
 895         if (flist && flist->hlink_pool) {
 896                 if (protocol_version < 28) {
 897                         if (S_ISREG(st.st_mode))
 898                                 file->link_u.idev = pool_talloc(
 899                                     flist->hlink_pool, struct idev, 1,
 900                                     "inode_table");
 901                 } else {
 902                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 903                                 file->link_u.idev = pool_talloc(
 904                                     flist->hlink_pool, struct idev, 1,
 905                                     "inode_table");
 906                 }
 907         }
 908         if (file->link_u.idev) {
 909                 file->F_DEV = st.st_dev;
 910                 file->F_INODE = st.st_ino;
 911         }
 912 #endif
 913
 914         if (dirname_len) {
 915                 file->dirname = lastdir = bp;
 916                 lastdir_len = dirname_len - 1;
 917                 memcpy(bp, dirname, dirname_len - 1);
 918                 bp += dirname_len;
 919                 bp[-1] = '\0';
 920         } else if (dirname)
 921                 file->dirname = dirname;
 922
 923         file->basename = bp;
 924         memcpy(bp, basename, basename_len);
 925         bp += basename_len;
 926
 927 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 928         if (preserve_devices && IS_DEVICE(st.st_mode))
 929                 file->u.rdev = st.st_rdev;
 930 #endif
 931
 932 #ifdef SUPPORT_LINKS
 933         if (linkname_len) {
 934                 file->u.link = bp;
 935                 memcpy(bp, linkname, linkname_len);
 936                 bp += linkname_len;
 937         }
 938 #endif
 939
 940         if (sum_len) {
 941                 file->u.sum = bp;
 942                 file_checksum(thisname, bp, st.st_size);
 943                 /*bp += sum_len;*/
 944         }
 945
 946         file->dir.root = flist_dir;
 947
 948         /* This code is only used by the receiver when it is building
 949          * a list of files for a delete pass. */
 950         if (keep_dirlinks && linkname_len && flist) {
 951                 STRUCT_STAT st2;
 952                 int save_mode = file->mode;
 953                 file->mode = S_IFDIR; /* find a directory w/our name */
 954                 if (flist_find(received_flist, file) >= 0
 955                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 956                         file->modtime = st2.st_mtime;
 957                         file->length = st2.st_size;
 958                         file->mode = st2.st_mode;
 959                         file->uid = st2.st_uid;
 960                         file->gid = st2.st_gid;
 961                         file->u.link = NULL;
 962                 } else
 963                         file->mode = save_mode;
 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         file = make_file(fname, flist, f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 980         if (!file)
 981                 return;
 982
 983         maybe_emit_filelist_progress(flist);
 984
 985         flist_expand(flist);
 986
 987         if (file->basename[0]) {
 988                 flist->files[flist->count++] = file;
 989                 send_file_entry(file, f, base_flags);
 990         }
 991
 992         if (recursive && S_ISDIR(file->mode)
 993             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 994                 void *save_filters;
 995                 unsigned int len = strlen(fbuf);
 996                 if (len > 1 && fbuf[len-1] == '/')
 997                         fbuf[--len] = '\0';
 998                 if (len >= MAXPATHLEN - 1) {
 999                         io_error |= IOERR_GENERAL;
1000                         rprintf(FERROR, "skipping long-named directory: %s\n",
1001                                 full_fname(fbuf));
1002                         return;
1003                 }
1004                 save_filters = push_local_filters(fbuf, len);
1005                 send_directory(f, flist, fbuf, len);
1006                 pop_local_filters(save_filters);
1007         }
1008 }
1009
1010
1011 /* Note that the "recurse" value either contains -1, for infinite recursion,
1012  * or a number >= 0 indicating how many levels of recursion we will allow.
1013  * This function is normally called by the sender, but the receiving side
1014  * also calls it from delete_in_dir() with f set to -1 so that we just
1015  * construct the file list in memory without sending it over the wire.  Also,
1016  * get_dirlist() calls this with f set to -2, which indicates that local
1017  * filter rules should be ignored. */
1018 static void send_directory(int f, struct file_list *flist,
1019                            char *fbuf, unsigned int len)
1020 {
1021         struct dirent *di;
1022         char *p;
1023         DIR *d;
1024
1025         if (!(d = opendir(fbuf))) {
1026                 io_error |= IOERR_GENERAL;
1027                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1028                 return;
1029         }
1030
1031         p = fbuf + len;
1032         if (len != 1 || *fbuf != '/')
1033                 *p++ = '/';
1034         *p = '\0';
1035
1036         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1037                 char *dname = d_name(di);
1038                 if (dname[0] == '.' && (dname[1] == '\0'
1039                     || (dname[1] == '.' && dname[2] == '\0')))
1040                         continue;
1041                 if (strlcpy(p, dname, MAXPATHLEN - len) < MAXPATHLEN - len) {
1042                         int do_subdirs = recurse >= 1 ? recurse-- : recurse;
1043                         send_file_name(f, flist, fbuf, do_subdirs, 0);
1044                 } else {
1045                         io_error |= IOERR_GENERAL;
1046                         rprintf(FINFO,
1047                                 "cannot send long-named file %s\n",
1048                                 full_fname(fbuf));
1049                 }
1050         }
1051         if (errno) {
1052                 io_error |= IOERR_GENERAL;
1053                 *p = '\0';
1054                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1055         }
1056
1057         closedir(d);
1058 }
1059
1060
1061 struct file_list *send_file_list(int f, int argc, char *argv[])
1062 {
1063         int l;
1064         STRUCT_STAT st;
1065         char *p, *dir, olddir[sizeof curr_dir];
1066         char lastpath[MAXPATHLEN] = "";
1067         struct file_list *flist;
1068         struct timeval start_tv, end_tv;
1069         int64 start_write;
1070         int use_ff_fd = 0;
1071
1072         if (show_filelist_p())
1073                 start_filelist_progress("building file list");
1074
1075         start_write = stats.total_written;
1076         gettimeofday(&start_tv, NULL);
1077
1078         flist = flist_new(WITH_HLINK, "send_file_list");
1079
1080         io_start_buffering_out();
1081         if (filesfrom_fd >= 0) {
1082                 if (argv[0] && !push_dir(argv[0])) {
1083                         rsyserr(FERROR, errno, "push_dir %s failed",
1084                                 full_fname(argv[0]));
1085                         exit_cleanup(RERR_FILESELECT);
1086                 }
1087                 use_ff_fd = 1;
1088         }
1089
1090         while (1) {
1091                 char fname2[MAXPATHLEN];
1092                 char *fname = fname2;
1093                 int do_subdirs;
1094
1095                 if (use_ff_fd) {
1096                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1097                                 break;
1098                         sanitize_path(fname, fname, "", 0);
1099                 } else {
1100                         if (argc-- == 0)
1101                                 break;
1102                         strlcpy(fname, *argv++, MAXPATHLEN);
1103                         if (sanitize_paths)
1104                                 sanitize_path(fname, fname, "", 0);
1105                 }
1106
1107                 l = strlen(fname);
1108                 if (!l || fname[l - 1] == '/') {
1109                         if (l == 2 && fname[0] == '.') {
1110                                 /* Turn "./" into just "." rather than "./." */
1111                                 fname[1] = '\0';
1112                         } else if (l < MAXPATHLEN) {
1113                                 fname[l++] = '.';
1114                                 fname[l] = '\0';
1115                         }
1116                 }
1117                 if (fname[l-1] == '.' && (l == 1 || fname[l-2] == '/')) {
1118                         if (!recurse && xfer_dirs)
1119                                 recurse = 1; /* allow one level */
1120                 } else if (recurse > 0)
1121                         recurse = 0;
1122
1123                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1124                         io_error |= IOERR_GENERAL;
1125                         rsyserr(FERROR, errno, "link_stat %s failed",
1126                                 full_fname(fname));
1127                         continue;
1128                 }
1129
1130                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1131                         rprintf(FINFO, "skipping directory %s\n",
1132                                 safe_fname(fname));
1133                         continue;
1134                 }
1135
1136                 dir = NULL;
1137                 olddir[0] = '\0';
1138
1139                 if (!relative_paths) {
1140                         p = strrchr(fname, '/');
1141                         if (p) {
1142                                 *p = 0;
1143                                 if (p == fname)
1144                                         dir = "/";
1145                                 else
1146                                         dir = fname;
1147                                 fname = p + 1;
1148                         }
1149                 } else if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1150                         /* this ensures we send the intermediate directories,
1151                            thus getting their permissions right */
1152                         char *lp = lastpath, *fn = fname, *slash = fname;
1153                         *p = 0;
1154                         /* Skip any initial directories in our path that we
1155                          * have in common with lastpath. */
1156                         while (*fn && *lp == *fn) {
1157                                 if (*fn == '/')
1158                                         slash = fn;
1159                                 lp++, fn++;
1160                         }
1161                         *p = '/';
1162                         if (fn != p || (*lp && *lp != '/')) {
1163                                 int save_copy_links = copy_links;
1164                                 int save_xfer_dirs = xfer_dirs;
1165                                 copy_links = copy_unsafe_links;
1166                                 xfer_dirs = 1;
1167                                 while ((slash = strchr(slash+1, '/')) != 0) {
1168                                         *slash = 0;
1169                                         send_file_name(f, flist, fname, 0, 0);
1170                                         *slash = '/';
1171                                 }
1172                                 copy_links = save_copy_links;
1173                                 xfer_dirs = save_xfer_dirs;
1174                                 *p = 0;
1175                                 strlcpy(lastpath, fname, sizeof lastpath);
1176                                 *p = '/';
1177                         }
1178                 }
1179
1180                 if (!*fname)
1181                         fname = ".";
1182
1183                 if (dir && *dir) {
1184                         static char *lastdir;
1185                         static int lastdir_len;
1186
1187                         strcpy(olddir, curr_dir); /* can't overflow */
1188
1189                         if (!push_dir(dir)) {
1190                                 io_error |= IOERR_GENERAL;
1191                                 rsyserr(FERROR, errno, "push_dir %s failed",
1192                                         full_fname(dir));
1193                                 continue;
1194                         }
1195
1196                         if (lastdir && strcmp(lastdir, dir) == 0) {
1197                                 flist_dir = lastdir;
1198                                 flist_dir_len = lastdir_len;
1199                         } else {
1200                                 flist_dir = lastdir = strdup(dir);
1201                                 flist_dir_len = lastdir_len = strlen(dir);
1202                         }
1203                 }
1204
1205                 if (one_file_system)
1206                         filesystem_dev = st.st_dev;
1207
1208                 do_subdirs = recurse >= 1 ? recurse-- : recurse;
1209                 send_file_name(f, flist, fname, do_subdirs, XMIT_TOP_DIR);
1210
1211                 if (olddir[0]) {
1212                         flist_dir = NULL;
1213                         flist_dir_len = 0;
1214                         if (!pop_dir(olddir)) {
1215                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1216                                         full_fname(dir));
1217                                 exit_cleanup(RERR_FILESELECT);
1218                         }
1219                 }
1220         }
1221
1222         gettimeofday(&end_tv, NULL);
1223         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1224                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1225         if (stats.flist_buildtime == 0)
1226                 stats.flist_buildtime = 1;
1227         start_tv = end_tv;
1228
1229         send_file_entry(NULL, f, 0);
1230
1231         if (show_filelist_p())
1232                 finish_filelist_progress(flist);
1233
1234         gettimeofday(&end_tv, NULL);
1235         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1236                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1237
1238         if (flist->hlink_pool) {
1239                 pool_destroy(flist->hlink_pool);
1240                 flist->hlink_pool = NULL;
1241         }
1242
1243         /* Sort the list without removing any duplicates.  This allows the
1244          * receiving side to ask for any name they like, which gives us the
1245          * flexibility to change the way we unduplicate names in the future
1246          * without causing a compatibility problem with older versions. */
1247         clean_flist(flist, 0, 0);
1248
1249         /* Now send the uid/gid list. This was introduced in
1250          * protocol version 15 */
1251         send_uid_list(f);
1252
1253         /* send the io_error flag */
1254         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1255
1256         io_end_buffering();
1257         stats.flist_size = stats.total_written - start_write;
1258         stats.num_files = flist->count;
1259
1260         if (verbose > 3)
1261                 output_flist(flist, who_am_i());
1262
1263         if (verbose > 2)
1264                 rprintf(FINFO, "send_file_list done\n");
1265
1266         return flist;
1267 }
1268
1269
1270 struct file_list *recv_file_list(int f)
1271 {
1272         struct file_list *flist;
1273         unsigned short flags;
1274         int64 start_read;
1275
1276         if (show_filelist_p())
1277                 start_filelist_progress("receiving file list");
1278
1279         start_read = stats.total_read;
1280
1281         flist = flist_new(WITH_HLINK, "recv_file_list");
1282         received_flist = flist;
1283
1284         flist->count = 0;
1285         flist->malloced = 1000;
1286         flist->files = new_array(struct file_struct *, flist->malloced);
1287         if (!flist->files)
1288                 goto oom;
1289
1290
1291         while ((flags = read_byte(f)) != 0) {
1292                 struct file_struct *file;
1293
1294                 flist_expand(flist);
1295
1296                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1297                         flags |= read_byte(f) << 8;
1298                 file = receive_file_entry(flist, flags, f);
1299
1300                 if (S_ISREG(file->mode))
1301                         stats.total_size += file->length;
1302
1303                 flist->files[flist->count++] = file;
1304
1305                 maybe_emit_filelist_progress(flist);
1306
1307                 if (verbose > 2) {
1308                         rprintf(FINFO, "recv_file_name(%s)\n",
1309                                 safe_fname(f_name(file)));
1310                 }
1311         }
1312         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1313
1314         if (verbose > 2)
1315                 rprintf(FINFO, "received %d names\n", flist->count);
1316
1317         if (show_filelist_p())
1318                 finish_filelist_progress(flist);
1319
1320         clean_flist(flist, relative_paths, 1);
1321
1322         if (f >= 0) {
1323                 /* Now send the uid/gid list. This was introduced in
1324                  * protocol version 15 */
1325                 recv_uid_list(f, flist);
1326
1327                 /* Recv the io_error flag */
1328                 if (lp_ignore_errors(module_id) || ignore_errors)
1329                         read_int(f);
1330                 else
1331                         io_error |= read_int(f);
1332         }
1333
1334         if (verbose > 3)
1335                 output_flist(flist, who_am_i());
1336
1337         if (list_only) {
1338                 int i;
1339                 for (i = 0; i < flist->count; i++)
1340                         list_file_entry(flist->files[i]);
1341         }
1342
1343         if (verbose > 2)
1344                 rprintf(FINFO, "recv_file_list done\n");
1345
1346         stats.flist_size = stats.total_read - start_read;
1347         stats.num_files = flist->count;
1348
1349         return flist;
1350
1351 oom:
1352         out_of_memory("recv_file_list");
1353         return NULL;            /* not reached */
1354 }
1355
1356
1357 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1358 {
1359         return f_name_cmp(*file1, *file2);
1360 }
1361
1362
1363 /* Search for an identically-named item in the file list.  Note that the
1364  * items must agree in their directory-ness, or no match is returned. */
1365 int flist_find(struct file_list *flist, struct file_struct *f)
1366 {
1367         int low = flist->low, high = flist->high;
1368         int ret, mid, mid_up;
1369
1370         while (low <= high) {
1371                 mid = (low + high) / 2;
1372                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1373                 if (mid_up <= high)
1374                         ret = f_name_cmp(flist->files[mid_up], f);
1375                 else
1376                         ret = 1;
1377                 if (ret == 0) {
1378                         if (protocol_version < 29
1379                             && S_ISDIR(flist->files[mid_up]->mode)
1380                             != S_ISDIR(f->mode))
1381                                 return -1;
1382                         return mid_up;
1383                 }
1384                 if (ret > 0)
1385                         high = mid - 1;
1386                 else
1387                         low = mid_up + 1;
1388         }
1389         return -1;
1390 }
1391
1392
1393 /*
1394  * Free up any resources a file_struct has allocated
1395  * and clear the file.
1396  */
1397 void clear_file(int i, struct file_list *flist)
1398 {
1399         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1400                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1401         memset(flist->files[i], 0, file_struct_len);
1402 }
1403
1404
1405 /*
1406  * allocate a new file list
1407  */
1408 struct file_list *flist_new(int with_hlink, char *msg)
1409 {
1410         struct file_list *flist;
1411
1412         flist = new(struct file_list);
1413         if (!flist)
1414                 out_of_memory(msg);
1415
1416         memset(flist, 0, sizeof (struct file_list));
1417
1418         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1419             out_of_memory, POOL_INTERN)))
1420                 out_of_memory(msg);
1421
1422 #ifdef SUPPORT_HARD_LINKS
1423         if (with_hlink && preserve_hard_links) {
1424                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1425                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1426                         out_of_memory(msg);
1427         }
1428 #endif
1429
1430         return flist;
1431 }
1432
1433 /*
1434  * free up all elements in a flist
1435  */
1436 void flist_free(struct file_list *flist)
1437 {
1438         pool_destroy(flist->file_pool);
1439         pool_destroy(flist->hlink_pool);
1440         free(flist->files);
1441         free(flist);
1442 }
1443
1444
1445 /*
1446  * This routine ensures we don't have any duplicate names in our file list.
1447  * duplicate names can cause corruption because of the pipelining
1448  */
1449 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1450 {
1451         int i, prev_i = 0;
1452
1453         if (!flist || flist->count == 0)
1454                 return;
1455
1456         sorting_flist = flist;
1457         qsort(flist->files, flist->count,
1458             sizeof flist->files[0], (int (*)())file_compare);
1459         sorting_flist = NULL;
1460
1461         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1462                 if (flist->files[i]->basename) {
1463                         prev_i = i;
1464                         break;
1465                 }
1466         }
1467         flist->low = prev_i;
1468         while (++i < flist->count) {
1469                 int j;
1470                 struct file_struct *file = flist->files[i];
1471
1472                 if (!file->basename)
1473                         continue;
1474                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1475                         j = prev_i;
1476                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1477                         int save_mode = file->mode;
1478                         /* Make sure that this directory doesn't duplicate a
1479                          * non-directory earlier in the list. */
1480                         flist->high = prev_i;
1481                         file->mode = S_IFREG;
1482                         j = flist_find(flist, file);
1483                         file->mode = save_mode;
1484                 } else
1485                         j = -1;
1486                 if (j >= 0) {
1487                         struct file_struct *fp = flist->files[j];
1488                         int keep, drop;
1489                         /* If one is a dir and the other is not, we want to
1490                          * keep the dir because it might have contents in the
1491                          * list. */
1492                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1493                                 if (S_ISDIR(file->mode))
1494                                         keep = i, drop = j;
1495                                 else
1496                                         keep = j, drop = i;
1497                         } else
1498                                 keep = j, drop = i;
1499                         if (verbose > 1 && !am_server) {
1500                                 rprintf(FINFO,
1501                                         "removing duplicate name %s from file list (%d)\n",
1502                                         safe_fname(f_name(file)), drop);
1503                         }
1504                         /* Make sure that if we unduplicate '.', that we don't
1505                          * lose track of a user-specified top directory. */
1506                         if (flist->files[drop]->flags & FLAG_TOP_DIR)
1507                                 flist->files[keep]->flags |= FLAG_TOP_DIR;
1508
1509                         clear_file(drop, flist);
1510
1511                         if (keep == i) {
1512                                 if (flist->low == drop) {
1513                                         for (j = drop + 1;
1514                                              j < i && !flist->files[j]->basename;
1515                                              j++) {}
1516                                         flist->low = j;
1517                                 }
1518                                 prev_i = i;
1519                         }
1520                 } else
1521                         prev_i = i;
1522         }
1523         flist->high = no_dups ? prev_i : flist->count - 1;
1524
1525         if (strip_root) {
1526                 /* We need to strip off the leading slashes for relative
1527                  * paths, but this must be done _after_ the sorting phase. */
1528                 for (i = flist->low; i <= flist->high; i++) {
1529                         struct file_struct *file = flist->files[i];
1530
1531                         if (!file->dirname)
1532                                 continue;
1533                         if (*file->dirname == '/') {
1534                                 char *s = file->dirname + 1;
1535                                 while (*s == '/') s++;
1536                                 memmove(file->dirname, s, strlen(s) + 1);
1537                         }
1538
1539                         if (!*file->dirname)
1540                                 file->dirname = NULL;
1541                 }
1542         }
1543 }
1544
1545 static void output_flist(struct file_list *flist, const char *whose_list)
1546 {
1547         char uidbuf[16], gidbuf[16], depthbuf[16];
1548         struct file_struct *file;
1549         int i;
1550
1551         for (i = 0; i < flist->count; i++) {
1552                 file = flist->files[i];
1553                 if ((am_root || am_sender) && preserve_uid)
1554                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1555                 else
1556                         *uidbuf = '\0';
1557                 if (preserve_gid && file->gid != GID_NONE)
1558                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1559                 else
1560                         *gidbuf = '\0';
1561                 if (!am_sender)
1562                         sprintf(depthbuf, "%d", file->dir.depth);
1563                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1564                         whose_list, i, am_sender ? NS(file->dir.root) : depthbuf,
1565                         file->dirname ? safe_fname(file->dirname) : "",
1566                         file->dirname ? "/" : "", NS(file->basename),
1567                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1568                         (double)file->length, uidbuf, gidbuf, file->flags);
1569         }
1570 }
1571
1572
1573 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1574 enum fnc_type { t_PATH, t_ITEM };
1575
1576 /* Compare the names of two file_struct entities, similar to how strcmp()
1577  * would do if it were operating on the joined strings.
1578  *
1579  * Some differences beginning with protocol_version 29: (1) directory names
1580  * are compared with an assumed trailing slash so that they compare in a
1581  * way that would cause them to sort immediately prior to any content they
1582  * may have; (2) a directory of any name compares after a non-directory of
1583  * any name at the same depth; (3) a directory with name "." compares prior
1584  * to anything else.  These changes mean that a directory and a non-dir
1585  * with the same name will not compare as equal (protocol_version >= 29).
1586  *
1587  * The dirname component can be an empty string, but the basename component
1588  * cannot (and never is in the current codebase).  The basename component
1589  * may be NULL (for a removed item), in which case it is considered to be
1590  * after any existing item. */
1591 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1592 {
1593         int dif;
1594         const uchar *c1, *c2;
1595         enum fnc_state state1, state2;
1596         enum fnc_type type1, type2;
1597         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1598
1599         if (!f1 || !f1->basename) {
1600                 if (!f2 || !f2->basename)
1601                         return 0;
1602                 return -1;
1603         }
1604         if (!f2 || !f2->basename)
1605                 return 1;
1606
1607         c1 = (uchar*)f1->dirname;
1608         c2 = (uchar*)f2->dirname;
1609         if (c1 == c2)
1610                 c1 = c2 = NULL;
1611         if (!c1) {
1612                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1613                 c1 = (uchar*)f1->basename;
1614                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1615                         type1 = t_ITEM;
1616                         state1 = s_TRAILING;
1617                         c1 = (uchar*)"";
1618                 } else
1619                         state1 = s_BASE;
1620         } else if (!*c1) {
1621                 type1 = t_path;
1622                 state1 = s_SLASH;
1623                 c1 = (uchar*)"/";
1624         } else {
1625                 type1 = t_path;
1626                 state1 = s_DIR;
1627         }
1628         if (!c2) {
1629                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1630                 c2 = (uchar*)f2->basename;
1631                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1632                         type2 = t_ITEM;
1633                         state2 = s_TRAILING;
1634                         c2 = (uchar*)"";
1635                 } else
1636                         state2 = s_BASE;
1637         } else if (!*c2) {
1638                 type2 = t_path;
1639                 state2 = s_SLASH;
1640                 c2 = (uchar*)"/";
1641         } else {
1642                 type2 = t_path;
1643                 state2 = s_DIR;
1644         }
1645
1646         if (type1 != type2)
1647                 return type1 == t_PATH ? 1 : -1;
1648
1649         while (1) {
1650                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1651                         break;
1652                 if (!*c1) {
1653                         switch (state1) {
1654                         case s_DIR:
1655                                 state1 = s_SLASH;
1656                                 c1 = (uchar*)"/";
1657                                 break;
1658                         case s_SLASH:
1659                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1660                                 state1 = s_BASE;
1661                                 c1 = (uchar*)f1->basename;
1662                                 break;
1663                         case s_BASE:
1664                                 state1 = s_TRAILING;
1665                                 if (type1 == t_PATH) {
1666                                         c1 = (uchar*)"/";
1667                                         break;
1668                                 }
1669                                 /* FALL THROUGH */
1670                         case s_TRAILING:
1671                                 type1 = t_ITEM;
1672                                 break;
1673                         }
1674                         if (*c2 && type1 != type2)
1675                                 return type1 == t_PATH ? 1 : -1;
1676                 }
1677                 if (!*c2) {
1678                         switch (state2) {
1679                         case s_DIR:
1680                                 if (state1 == s_SLASH && sorting_flist) {
1681                                         int j;
1682                                         /* Optimize for future comparisons. */
1683                                         for (j = 0;
1684                                              j < sorting_flist->count;
1685                                              j++) {
1686                                                 struct file_struct *fp
1687                                                     = sorting_flist->files[j];
1688                                                 if (fp->dirname == f2->dirname)
1689                                                         fp->dirname = f1->dirname;
1690                                         }
1691                                 }
1692                                 state2 = s_SLASH;
1693                                 c2 = (uchar*)"/";
1694                                 break;
1695                         case s_SLASH:
1696                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1697                                 state2 = s_BASE;
1698                                 c2 = (uchar*)f2->basename;
1699                                 break;
1700                         case s_BASE:
1701                                 state2 = s_TRAILING;
1702                                 if (type2 == t_PATH) {
1703                                         c2 = (uchar*)"/";
1704                                         break;
1705                                 }
1706                                 /* FALL THROUGH */
1707                         case s_TRAILING:
1708                                 if (!*c1)
1709                                         return 0;
1710                                 type2 = t_ITEM;
1711                                 break;
1712                         }
1713                         if (type1 != type2)
1714                                 return type1 == t_PATH ? 1 : -1;
1715                 }
1716         }
1717
1718         return dif;
1719 }
1720
1721
1722 /* Return a copy of the full filename of a flist entry, using the indicated
1723  * buffer.  No size-checking is done because we checked the size when creating
1724  * the file_struct entry.
1725  */
1726 char *f_name_to(struct file_struct *f, char *fbuf)
1727 {
1728         if (!f || !f->basename)
1729                 return NULL;
1730
1731         if (f->dirname) {
1732                 int len = strlen(f->dirname);
1733                 memcpy(fbuf, f->dirname, len);
1734                 fbuf[len] = '/';
1735                 strcpy(fbuf + len + 1, f->basename);
1736         } else
1737                 strcpy(fbuf, f->basename);
1738         return fbuf;
1739 }
1740
1741
1742 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1743 char *f_name(struct file_struct *f)
1744 {
1745         static char names[5][MAXPATHLEN];
1746         static unsigned int n;
1747
1748         n = (n + 1) % (sizeof names / sizeof names[0]);
1749
1750         return f_name_to(f, names[n]);
1751 }
1752
1753
1754 struct file_list *get_dirlist(const char *dirname, int ignore_filter_rules)
1755 {
1756         struct file_list *dirlist;
1757         char dirbuf[MAXPATHLEN];
1758         int dlen;
1759         int save_recurse = recurse;
1760
1761         dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1762         if (dlen >= MAXPATHLEN)
1763                 return NULL;
1764
1765         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1766         recurse = 0;
1767         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirbuf, dlen);
1768         recurse = save_recurse;
1769
1770         return dirlist;
1771 }
1772
1773
1774 static int deletion_count = 0; /* used to implement --max-delete */
1775
1776 static int is_backup_file(char *fn)
1777 {
1778         int k = strlen(fn) - backup_suffix_len;
1779         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
1780 }
1781
1782
1783 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
1784  * force_delete is set, this will delete recursively as long as DEL_NO_RECURSE
1785  * is not set in the flags. */
1786 int delete_file(char *fname, int mode, int flags)
1787 {
1788         struct file_list *dirlist;
1789         char buf[MAXPATHLEN];
1790         int j, zap_dir, ok;
1791
1792         if (max_delete && deletion_count >= max_delete)
1793                 return -1;
1794
1795         if (!S_ISDIR(mode)) {
1796                 if (make_backups && (backup_dir || !is_backup_file(fname)))
1797                         ok = make_backup(fname);
1798                 else
1799                         ok = robust_unlink(fname) == 0;
1800                 if (ok) {
1801                         if ((verbose || log_format) && !(flags & DEL_TERSE))
1802                                 log_delete(fname, mode);
1803                         deletion_count++;
1804                         return 0;
1805                 }
1806                 if (errno == ENOENT)
1807                         return 0;
1808                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
1809                         full_fname(fname));
1810                 return -1;
1811         }
1812
1813         zap_dir = (flags & DEL_FORCE_RECURSE || (force_delete && recurse))
1814                 && !(flags & DEL_NO_RECURSE);
1815         if (dry_run && zap_dir)
1816                 errno = ENOTEMPTY;
1817         else if (do_rmdir(fname) == 0) {
1818                 if ((verbose || log_format) && !(flags & DEL_TERSE))
1819                         log_delete(fname, mode);
1820                 deletion_count++;
1821                 return 0;
1822         }
1823         if (errno == ENOENT)
1824                 return 0;
1825         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
1826                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
1827                         full_fname(fname));
1828                 return -1;
1829         }
1830
1831         dirlist = get_dirlist(fname, 0);
1832         for (j = 0; j < dirlist->count; j++) {
1833                 struct file_struct *fp = dirlist->files[j];
1834                 f_name_to(fp, buf);
1835                 if (delete_file(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
1836                         flist_free(dirlist);
1837                         return -1;
1838                 }
1839         }
1840         flist_free(dirlist);
1841
1842         if (max_delete && deletion_count >= max_delete)
1843                 return -1;
1844
1845         if (make_backups && !backup_dir && !is_backup_file(fname))
1846                 ok = make_backup(fname);
1847         else
1848                 ok = do_rmdir(fname) == 0;
1849         if (ok) {
1850                 if ((verbose || log_format) && !(flags & DEL_TERSE))
1851                         log_delete(fname, mode);
1852                 deletion_count++;
1853         } else if (errno != ENOTEMPTY && errno != ENOENT) {
1854                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
1855                         full_fname(fname));
1856                 return -1;
1857         }
1858
1859         return 0;
1860 }
1861
1862
1863 /* If an item in dir_list is not found in full_list, delete it from the
1864  * filesystem. */
1865 static void delete_missing(struct file_list *full_list,
1866                            struct file_list *dir_list, const char *dirname)
1867 {
1868         char fbuf[MAXPATHLEN];
1869         int i;
1870
1871         if (max_delete && deletion_count >= max_delete)
1872                 return;
1873
1874         if (verbose > 2)
1875                 rprintf(FINFO, "delete_missing(%s)\n", safe_fname(dirname));
1876
1877         for (i = dir_list->count; i--; ) {
1878                 if (!dir_list->files[i]->basename)
1879                         continue;
1880                 if (flist_find(full_list, dir_list->files[i]) < 0) {
1881                         char *fn = f_name_to(dir_list->files[i], fbuf);
1882                         int mode = dir_list->files[i]->mode;
1883                         int dflag = S_ISDIR(mode) ? DEL_FORCE_RECURSE : 0;
1884                         if (delete_file(fn, mode, dflag) < 0)
1885                                 break;
1886                 }
1887         }
1888 }
1889
1890
1891 /* This function is used to implement per-directory deletion, and
1892  * is used by all the --delete-WHEN options.  Note that the fbuf
1893  * pointer must point to a MAXPATHLEN buffer with the name of the
1894  * directory in it (the functions we call will append names onto
1895  * the end, but the old dir value will be restored on exit). */
1896 void delete_in_dir(struct file_list *flist, char *fbuf,
1897                    struct file_struct *file)
1898 {
1899         static int min_depth = MAXPATHLEN, cur_depth = -1;
1900         static void *filt_array[MAXPATHLEN/2+1];
1901         struct file_list *dir_list;
1902         STRUCT_STAT st;
1903         int dlen;
1904
1905         if (!flist) {
1906                 while (cur_depth >= min_depth)
1907                         pop_local_filters(filt_array[cur_depth--]);
1908                 min_depth = MAXPATHLEN;
1909                 cur_depth = -1;
1910                 return;
1911         }
1912         if (file->dir.depth >= MAXPATHLEN/2+1)
1913                 return; /* Impossible... */
1914
1915         if (max_delete && deletion_count >= max_delete)
1916                 return;
1917
1918         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
1919                 rprintf(FINFO,
1920                         "IO error encountered -- skipping file deletion\n");
1921                 max_delete = -1; /* avoid duplicating the above warning */
1922                 return;
1923         }
1924
1925         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
1926                 pop_local_filters(filt_array[cur_depth--]);
1927         cur_depth = file->dir.depth;
1928         if (min_depth > cur_depth)
1929                 min_depth = cur_depth;
1930         dlen = strlen(fbuf);
1931         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
1932
1933         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
1934                 return;
1935
1936         if (one_file_system && file->flags & FLAG_TOP_DIR)
1937                 filesystem_dev = st.st_dev;
1938
1939         dir_list = flist_new(WITHOUT_HLINK, "delete_in_dir");
1940
1941         recurse = 0;
1942         send_directory(-1, dir_list, fbuf, dlen);
1943         recurse = -1;
1944         fbuf[dlen] = '\0';
1945
1946         if (verbose > 3)
1947                 output_flist(dir_list, "delete");
1948
1949         delete_missing(flist, dir_list, fbuf);
1950
1951         flist_free(dir_list);
1952 }