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 *backup_dir;
  67 extern char *backup_suffix;
  68 extern int backup_suffix_len;
  69
  70 extern char curr_dir[MAXPATHLEN];
  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, *sorting_flist;
  80 static dev_t filesystem_dev; /* used to implement -x */
  81
  82 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  83 static void output_flist(struct file_list *flist, const char *whose_list);
  84
  85 void init_flist(void)
  86 {
  87         struct file_struct f;
  88
  89         /* Figure out how big the file_struct is without trailing padding */
  90         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  91 }
  92
  93
  94 static int show_filelist_p(void)
  95 {
  96         return verbose && xfer_dirs && !am_server;
  97 }
  98
  99 static void start_filelist_progress(char *kind)
 100 {
 101         rprintf(FINFO, "%s ... ", kind);
 102         if (verbose > 1 || do_progress)
 103                 rprintf(FINFO, "\n");
 104         rflush(FINFO);
 105 }
 106
 107
 108 static void emit_filelist_progress(const struct file_list *flist)
 109 {
 110         rprintf(FINFO, " %d files...\r", flist->count);
 111 }
 112
 113
 114 static void maybe_emit_filelist_progress(const struct file_list *flist)
 115 {
 116         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
 117                 emit_filelist_progress(flist);
 118 }
 119
 120
 121 static void finish_filelist_progress(const struct file_list *flist)
 122 {
 123         if (do_progress) {
 124                 /* This overwrites the progress line */
 125                 rprintf(FINFO, "%d file%sto consider\n",
 126                         flist->count, flist->count == 1 ? " " : "s ");
 127         } else
 128                 rprintf(FINFO, "done\n");
 129 }
 130
 131 void show_flist_stats(void)
 132 {
 133         /* Nothing yet */
 134 }
 135
 136
 137 static void list_file_entry(struct file_struct *f)
 138 {
 139         char perms[11];
 140
 141         if (!f->basename) {
 142                 /* this can happen if duplicate names were removed */
 143                 return;
 144         }
 145
 146         permstring(perms, f->mode);
 147
 148 #ifdef SUPPORT_LINKS
 149         if (preserve_links && S_ISLNK(f->mode)) {
 150                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 151                         perms,
 152                         (double)f->length, timestring(f->modtime),
 153                         safe_fname(f_name(f)), safe_fname(f->u.link));
 154         } else
 155 #endif
 156         {
 157                 rprintf(FINFO, "%s %11.0f %s %s\n",
 158                         perms,
 159                         (double)f->length, timestring(f->modtime),
 160                         safe_fname(f_name(f)));
 161         }
 162 }
 163
 164
 165 /**
 166  * Stat either a symlink or its referent, depending on the settings of
 167  * copy_links, copy_unsafe_links, etc.
 168  *
 169  * @retval -1 on error
 170  *
 171  * @retval 0 for success
 172  *
 173  * @post If @p path is a symlink, then @p linkbuf (of size @c
 174  * MAXPATHLEN) contains the symlink target.
 175  *
 176  * @post @p buffer contains information about the link or the
 177  * referrent as appropriate, if they exist.
 178  **/
 179 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 180 {
 181 #ifdef SUPPORT_LINKS
 182         if (copy_links)
 183                 return do_stat(path, buffer);
 184         if (link_stat(path, buffer, 0) < 0)
 185                 return -1;
 186         if (S_ISLNK(buffer->st_mode)) {
 187                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 188                 if (l == -1)
 189                         return -1;
 190                 linkbuf[l] = 0;
 191                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 192                         if (verbose > 1) {
 193                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 194                                         safe_fname(path), safe_fname(linkbuf));
 195                         }
 196                         return do_stat(path, buffer);
 197                 }
 198         }
 199         return 0;
 200 #else
 201         return do_stat(path, buffer);
 202 #endif
 203 }
 204
 205 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 206 {
 207 #ifdef SUPPORT_LINKS
 208         if (copy_links)
 209                 return do_stat(path, buffer);
 210         if (do_lstat(path, buffer) < 0)
 211                 return -1;
 212         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 213                 STRUCT_STAT st;
 214                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 215                         *buffer = st;
 216         }
 217         return 0;
 218 #else
 219         return do_stat(path, buffer);
 220 #endif
 221 }
 222
 223 /* This function is used to check if a file should be included/excluded
 224  * from the list of files based on its name and type etc.  The value of
 225  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 226 static int is_excluded(char *fname, int is_dir, int filter_level)
 227 {
 228 #if 0 /* This currently never happens, so avoid a useless compare. */
 229         if (filter_level == NO_FILTERS)
 230                 return 0;
 231 #endif
 232         if (fname) {
 233                 /* never exclude '.', even if somebody does --exclude '*' */
 234                 if (fname[0] == '.' && !fname[1])
 235                         return 0;
 236                 /* Handle the -R version of the '.' dir. */
 237                 if (fname[0] == '/') {
 238                         int len = strlen(fname);
 239                         if (fname[len-1] == '.' && fname[len-2] == '/')
 240                                 return 0;
 241                 }
 242         }
 243         if (server_filter_list.head
 244             && check_filter(&server_filter_list, fname, is_dir) < 0)
 245                 return 1;
 246         if (filter_level != ALL_FILTERS)
 247                 return 0;
 248         if (filter_list.head
 249             && check_filter(&filter_list, fname, is_dir) < 0)
 250                 return 1;
 251         return 0;
 252 }
 253
 254 static int to_wire_mode(mode_t mode)
 255 {
 256 #ifdef SUPPORT_LINKS
 257         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 258                 return (mode & ~(_S_IFMT)) | 0120000;
 259 #endif
 260         return (int)mode;
 261 }
 262
 263 static mode_t from_wire_mode(int mode)
 264 {
 265         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 266                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 267         return (mode_t)mode;
 268 }
 269
 270
 271 static void send_directory(int f, struct file_list *flist,
 272                            char *fbuf, unsigned int offset);
 273
 274 static char *flist_dir;
 275 static int flist_dir_len;
 276
 277
 278 /**
 279  * Make sure @p flist is big enough to hold at least @p flist->count
 280  * entries.
 281  **/
 282 void flist_expand(struct file_list *flist)
 283 {
 284         struct file_struct **new_ptr;
 285
 286         if (flist->count < flist->malloced)
 287                 return;
 288
 289         if (flist->malloced < FLIST_START)
 290                 flist->malloced = FLIST_START;
 291         else if (flist->malloced >= FLIST_LINEAR)
 292                 flist->malloced += FLIST_LINEAR;
 293         else
 294                 flist->malloced *= 2;
 295
 296         /*
 297          * In case count jumped or we are starting the list
 298          * with a known size just set it.
 299          */
 300         if (flist->malloced < flist->count)
 301                 flist->malloced = flist->count;
 302
 303         new_ptr = realloc_array(flist->files, struct file_struct *,
 304                                 flist->malloced);
 305
 306         if (verbose >= 2 && flist->malloced != FLIST_START) {
 307                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 308                     who_am_i(),
 309                     (double)sizeof flist->files[0] * flist->malloced,
 310                     (new_ptr == flist->files) ? " not" : "");
 311         }
 312
 313         flist->files = new_ptr;
 314
 315         if (!flist->files)
 316                 out_of_memory("flist_expand");
 317 }
 318
 319 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 320 {
 321         unsigned short flags;
 322         static time_t modtime;
 323         static mode_t mode;
 324         static int64 dev;
 325         static dev_t rdev;
 326         static uint32 rdev_major;
 327         static uid_t uid;
 328         static gid_t gid;
 329         static char lastname[MAXPATHLEN];
 330         char fname[MAXPATHLEN];
 331         int l1, l2;
 332
 333         if (f < 0)
 334                 return;
 335
 336         if (!file) {
 337                 write_byte(f, 0);
 338                 modtime = 0, mode = 0;
 339                 dev = 0, rdev = makedev(0, 0);
 340                 rdev_major = 0;
 341                 uid = 0, gid = 0;
 342                 *lastname = '\0';
 343                 return;
 344         }
 345
 346         io_write_phase = "send_file_entry";
 347
 348         f_name_to(file, fname);
 349
 350         flags = base_flags;
 351
 352         if (file->mode == mode)
 353                 flags |= XMIT_SAME_MODE;
 354         else
 355                 mode = file->mode;
 356         if (preserve_devices) {
 357                 if (protocol_version < 28) {
 358                         if (IS_DEVICE(mode)) {
 359                                 if (file->u.rdev == rdev)
 360                                         flags |= XMIT_SAME_RDEV_pre28;
 361                                 else
 362                                         rdev = file->u.rdev;
 363                         } else
 364                                 rdev = makedev(0, 0);
 365                 } else if (IS_DEVICE(mode)) {
 366                         rdev = file->u.rdev;
 367                         if ((uint32)major(rdev) == rdev_major)
 368                                 flags |= XMIT_SAME_RDEV_MAJOR;
 369                         else
 370                                 rdev_major = major(rdev);
 371                         if ((uint32)minor(rdev) <= 0xFFu)
 372                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 373                 }
 374         }
 375         if (file->uid == uid)
 376                 flags |= XMIT_SAME_UID;
 377         else
 378                 uid = file->uid;
 379         if (file->gid == gid)
 380                 flags |= XMIT_SAME_GID;
 381         else
 382                 gid = file->gid;
 383         if (file->modtime == modtime)
 384                 flags |= XMIT_SAME_TIME;
 385         else
 386                 modtime = file->modtime;
 387
 388 #ifdef SUPPORT_HARD_LINKS
 389         if (file->link_u.idev) {
 390                 if (file->F_DEV == dev) {
 391                         if (protocol_version >= 28)
 392                                 flags |= XMIT_SAME_DEV;
 393                 } else
 394                         dev = file->F_DEV;
 395                 flags |= XMIT_HAS_IDEV_DATA;
 396         }
 397 #endif
 398
 399         for (l1 = 0;
 400             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 401             l1++) {}
 402         l2 = strlen(fname+l1);
 403
 404         if (l1 > 0)
 405                 flags |= XMIT_SAME_NAME;
 406         if (l2 > 255)
 407                 flags |= XMIT_LONG_NAME;
 408
 409         /* We must make sure we don't send a zero flag byte or the
 410          * other end will terminate the flist transfer.  Note that
 411          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 412          * it's harmless way to add a bit to the first flag byte. */
 413         if (protocol_version >= 28) {
 414                 if (!flags && !S_ISDIR(mode))
 415                         flags |= XMIT_TOP_DIR;
 416                 if ((flags & 0xFF00) || !flags) {
 417                         flags |= XMIT_EXTENDED_FLAGS;
 418                         write_byte(f, flags);
 419                         write_byte(f, flags >> 8);
 420                 } else
 421                         write_byte(f, flags);
 422         } else {
 423                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 424                         flags |= XMIT_TOP_DIR;
 425                 if (!(flags & 0xFF))
 426                         flags |= XMIT_LONG_NAME;
 427                 write_byte(f, flags);
 428         }
 429         if (flags & XMIT_SAME_NAME)
 430                 write_byte(f, l1);
 431         if (flags & XMIT_LONG_NAME)
 432                 write_int(f, l2);
 433         else
 434                 write_byte(f, l2);
 435         write_buf(f, fname + l1, l2);
 436
 437         write_longint(f, file->length);
 438         if (!(flags & XMIT_SAME_TIME))
 439                 write_int(f, modtime);
 440         if (!(flags & XMIT_SAME_MODE))
 441                 write_int(f, to_wire_mode(mode));
 442         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 443                 if (!numeric_ids)
 444                         add_uid(uid);
 445                 write_int(f, uid);
 446         }
 447         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 448                 if (!numeric_ids)
 449                         add_gid(gid);
 450                 write_int(f, gid);
 451         }
 452         if (preserve_devices && IS_DEVICE(mode)) {
 453                 if (protocol_version < 28) {
 454                         if (!(flags & XMIT_SAME_RDEV_pre28))
 455                                 write_int(f, (int)rdev);
 456                 } else {
 457                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 458                                 write_int(f, major(rdev));
 459                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 460                                 write_byte(f, minor(rdev));
 461                         else
 462                                 write_int(f, minor(rdev));
 463                 }
 464         }
 465
 466 #ifdef SUPPORT_LINKS
 467         if (preserve_links && S_ISLNK(mode)) {
 468                 int len = strlen(file->u.link);
 469                 write_int(f, len);
 470                 write_buf(f, file->u.link, len);
 471         }
 472 #endif
 473
 474 #ifdef SUPPORT_HARD_LINKS
 475         if (flags & XMIT_HAS_IDEV_DATA) {
 476                 if (protocol_version < 26) {
 477                         /* 32-bit dev_t and ino_t */
 478                         write_int(f, dev);
 479                         write_int(f, file->F_INODE);
 480                 } else {
 481                         /* 64-bit dev_t and ino_t */
 482                         if (!(flags & XMIT_SAME_DEV))
 483                                 write_longint(f, dev);
 484                         write_longint(f, file->F_INODE);
 485                 }
 486         }
 487 #endif
 488
 489         if (always_checksum) {
 490                 char *sum;
 491                 if (S_ISREG(mode))
 492                         sum = file->u.sum;
 493                 else if (protocol_version < 28) {
 494                         /* Prior to 28, we sent a useless set of nulls. */
 495                         sum = empty_sum;
 496                 } else
 497                         sum = NULL;
 498                 if (sum) {
 499                         write_buf(f, sum,
 500                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 501                 }
 502         }
 503
 504         strlcpy(lastname, fname, MAXPATHLEN);
 505
 506         io_write_phase = "unknown";
 507 }
 508
 509
 510
 511 static struct file_struct *receive_file_entry(struct file_list *flist,
 512                                               unsigned short flags, int f)
 513 {
 514         static time_t modtime;
 515         static mode_t mode;
 516         static int64 dev;
 517         static dev_t rdev;
 518         static uint32 rdev_major;
 519         static uid_t uid;
 520         static gid_t gid;
 521         static char lastname[MAXPATHLEN], *lastdir;
 522         static int lastdir_depth, lastdir_len = -1;
 523         static unsigned int del_hier_name_len = 0;
 524         static int in_del_hier = 0;
 525         char thisname[MAXPATHLEN];
 526         unsigned int l1 = 0, l2 = 0;
 527         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 528         OFF_T file_length;
 529         char *basename, *dirname, *bp;
 530         struct file_struct *file;
 531
 532         if (!flist) {
 533                 modtime = 0, mode = 0;
 534                 dev = 0, rdev = makedev(0, 0);
 535                 rdev_major = 0;
 536                 uid = 0, gid = 0;
 537                 *lastname = '\0';
 538                 lastdir_len = -1;
 539                 in_del_hier = 0;
 540                 return NULL;
 541         }
 542
 543         if (flags & XMIT_SAME_NAME)
 544                 l1 = read_byte(f);
 545
 546         if (flags & XMIT_LONG_NAME)
 547                 l2 = read_int(f);
 548         else
 549                 l2 = read_byte(f);
 550
 551         if (l2 >= MAXPATHLEN - l1) {
 552                 rprintf(FERROR,
 553                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 554                         flags, l1, l2, safe_fname(lastname));
 555                 overflow("receive_file_entry");
 556         }
 557
 558         strlcpy(thisname, lastname, l1 + 1);
 559         read_sbuf(f, &thisname[l1], l2);
 560         thisname[l1 + l2] = 0;
 561
 562         strlcpy(lastname, thisname, MAXPATHLEN);
 563
 564         clean_fname(thisname, 0);
 565
 566         if (sanitize_paths)
 567                 sanitize_path(thisname, thisname, "", 0);
 568
 569         if ((basename = strrchr(thisname, '/')) != NULL) {
 570                 dirname_len = ++basename - thisname; /* counts future '\0' */
 571                 if (lastdir_len == dirname_len - 1
 572                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 573                         dirname = lastdir;
 574                         dirname_len = 0; /* indicates no copy is needed */
 575                 } else
 576                         dirname = thisname;
 577         } else {
 578                 basename = thisname;
 579                 dirname = NULL;
 580                 dirname_len = 0;
 581         }
 582         basename_len = strlen(basename) + 1; /* count the '\0' */
 583
 584         file_length = read_longint(f);
 585         if (!(flags & XMIT_SAME_TIME))
 586                 modtime = (time_t)read_int(f);
 587         if (!(flags & XMIT_SAME_MODE))
 588                 mode = from_wire_mode(read_int(f));
 589
 590         if (preserve_uid && !(flags & XMIT_SAME_UID))
 591                 uid = (uid_t)read_int(f);
 592         if (preserve_gid && !(flags & XMIT_SAME_GID))
 593                 gid = (gid_t)read_int(f);
 594
 595         if (preserve_devices) {
 596                 if (protocol_version < 28) {
 597                         if (IS_DEVICE(mode)) {
 598                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 599                                         rdev = (dev_t)read_int(f);
 600                         } else
 601                                 rdev = makedev(0, 0);
 602                 } else if (IS_DEVICE(mode)) {
 603                         uint32 rdev_minor;
 604                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 605                                 rdev_major = read_int(f);
 606                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 607                                 rdev_minor = read_byte(f);
 608                         else
 609                                 rdev_minor = read_int(f);
 610                         rdev = makedev(rdev_major, rdev_minor);
 611                 }
 612         }
 613
 614 #ifdef SUPPORT_LINKS
 615         if (preserve_links && S_ISLNK(mode)) {
 616                 linkname_len = read_int(f) + 1; /* count the '\0' */
 617                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 618                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 619                                 linkname_len - 1);
 620                         overflow("receive_file_entry");
 621                 }
 622         }
 623         else
 624 #endif
 625                 linkname_len = 0;
 626
 627         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 628
 629         alloc_len = file_struct_len + dirname_len + basename_len
 630                   + linkname_len + sum_len;
 631         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 632
 633         file = (struct file_struct *)bp;
 634         memset(bp, 0, file_struct_len);
 635         bp += file_struct_len;
 636
 637         file->flags = 0;
 638         file->modtime = modtime;
 639         file->length = file_length;
 640         file->mode = mode;
 641         file->uid = uid;
 642         file->gid = gid;
 643
 644         if (dirname_len) {
 645                 file->dirname = lastdir = bp;
 646                 lastdir_len = dirname_len - 1;
 647                 memcpy(bp, dirname, dirname_len - 1);
 648                 bp += dirname_len;
 649                 bp[-1] = '\0';
 650                 lastdir_depth = count_dir_elements(lastdir);
 651                 file->dir.depth = lastdir_depth + 1;
 652         } else if (dirname) {
 653                 file->dirname = dirname; /* we're reusing lastname */
 654                 file->dir.depth = lastdir_depth + 1;
 655         } else
 656                 file->dir.depth = 1;
 657
 658         if (S_ISDIR(mode)) {
 659                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 660                         file->dir.depth--;
 661                 if (flags & XMIT_TOP_DIR) {
 662                         in_del_hier = 1;
 663                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 664                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 665                 } else if (in_del_hier) {
 666                         if (!relative_paths || !del_hier_name_len
 667                          || (l1 >= del_hier_name_len
 668                           && thisname[del_hier_name_len] == '/'))
 669                                 file->flags |= FLAG_DEL_HERE;
 670                         else
 671                                 in_del_hier = 0;
 672                 }
 673         }
 674
 675         file->basename = bp;
 676         memcpy(bp, basename, basename_len);
 677         bp += basename_len;
 678
 679         if (preserve_devices && IS_DEVICE(mode))
 680                 file->u.rdev = rdev;
 681
 682 #ifdef SUPPORT_LINKS
 683         if (linkname_len) {
 684                 file->u.link = bp;
 685                 read_sbuf(f, bp, linkname_len - 1);
 686                 if (sanitize_paths)
 687                         sanitize_path(bp, bp, "", lastdir_depth);
 688                 bp += linkname_len;
 689         }
 690 #endif
 691
 692 #ifdef SUPPORT_HARD_LINKS
 693         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 694                 flags |= XMIT_HAS_IDEV_DATA;
 695         if (flags & XMIT_HAS_IDEV_DATA) {
 696                 int64 inode;
 697                 if (protocol_version < 26) {
 698                         dev = read_int(f);
 699                         inode = read_int(f);
 700                 } else {
 701                         if (!(flags & XMIT_SAME_DEV))
 702                                 dev = read_longint(f);
 703                         inode = read_longint(f);
 704                 }
 705                 if (flist->hlink_pool) {
 706                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 707                             struct idev, 1, "inode_table");
 708                         file->F_INODE = inode;
 709                         file->F_DEV = dev;
 710                 }
 711         }
 712 #endif
 713
 714         if (always_checksum) {
 715                 char *sum;
 716                 if (sum_len) {
 717                         file->u.sum = sum = bp;
 718                         /*bp += sum_len;*/
 719                 } else if (protocol_version < 28) {
 720                         /* Prior to 28, we get a useless set of nulls. */
 721                         sum = empty_sum;
 722                 } else
 723                         sum = NULL;
 724                 if (sum) {
 725                         read_buf(f, sum,
 726                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 727                 }
 728         }
 729
 730         if (!preserve_perms) {
 731                 /* set an appropriate set of permissions based on original
 732                  * permissions and umask. This emulates what GNU cp does */
 733                 file->mode &= ~orig_umask;
 734         }
 735
 736         return file;
 737 }
 738
 739
 740 /**
 741  * Create a file_struct for a named file by reading its stat()
 742  * information and performing extensive checks against global
 743  * options.
 744  *
 745  * @return the new file, or NULL if there was an error or this file
 746  * should be excluded.
 747  *
 748  * @todo There is a small optimization opportunity here to avoid
 749  * stat()ing the file in some circumstances, which has a certain cost.
 750  * We are called immediately after doing readdir(), and so we may
 751  * already know the d_type of the file.  We could for example avoid
 752  * statting directories if we're not recursing, but this is not a very
 753  * important case.  Some systems may not have d_type.
 754  **/
 755 struct file_struct *make_file(char *fname, struct file_list *flist,
 756                               int filter_level)
 757 {
 758         static char *lastdir;
 759         static int lastdir_len = -1;
 760         struct file_struct *file;
 761         STRUCT_STAT st;
 762         char sum[SUM_LENGTH];
 763         char thisname[MAXPATHLEN];
 764         char linkname[MAXPATHLEN];
 765         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 766         char *basename, *dirname, *bp;
 767         unsigned short flags = 0;
 768
 769         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 770                 lastdir_len = -1;
 771
 772         if (strlcpy(thisname, fname, sizeof thisname)
 773             >= sizeof thisname - flist_dir_len) {
 774                 rprintf(FINFO, "skipping overly long name: %s\n",
 775                         safe_fname(fname));
 776                 return NULL;
 777         }
 778         clean_fname(thisname, 0);
 779         if (sanitize_paths)
 780                 sanitize_path(thisname, thisname, "", 0);
 781
 782         memset(sum, 0, SUM_LENGTH);
 783
 784         if (readlink_stat(thisname, &st, linkname) != 0) {
 785                 int save_errno = errno;
 786                 /* See if file is excluded before reporting an error. */
 787                 if (filter_level != NO_FILTERS
 788                     && is_excluded(thisname, 0, filter_level))
 789                         return NULL;
 790                 if (save_errno == ENOENT) {
 791 #ifdef SUPPORT_LINKS
 792                         /* Avoid "vanished" error if symlink points nowhere. */
 793                         if (copy_links && do_lstat(thisname, &st) == 0
 794                             && S_ISLNK(st.st_mode)) {
 795                                 io_error |= IOERR_GENERAL;
 796                                 rprintf(FERROR, "symlink has no referent: %s\n",
 797                                         full_fname(thisname));
 798                         } else
 799 #endif
 800                         {
 801                                 enum logcode c = am_daemon && protocol_version < 28
 802                                     ? FERROR : FINFO;
 803                                 io_error |= IOERR_VANISHED;
 804                                 rprintf(c, "file has vanished: %s\n",
 805                                         full_fname(thisname));
 806                         }
 807                 } else {
 808                         io_error |= IOERR_GENERAL;
 809                         rsyserr(FERROR, save_errno, "readlink %s failed",
 810                                 full_fname(thisname));
 811                 }
 812                 return NULL;
 813         }
 814
 815         /* backup.c calls us with filter_level set to NO_FILTERS. */
 816         if (filter_level == NO_FILTERS)
 817                 goto skip_filters;
 818
 819         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 820                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
 821                 return NULL;
 822         }
 823
 824         /* We only care about directories because we need to avoid recursing
 825          * into a mount-point directory, not to avoid copying a symlinked
 826          * file if -L (or similar) was specified. */
 827         if (one_file_system && st.st_dev != filesystem_dev
 828             && S_ISDIR(st.st_mode))
 829                 flags |= FLAG_MOUNT_POINT;
 830
 831         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 832                 return NULL;
 833
 834         if (lp_ignore_nonreadable(module_id)) {
 835 #ifdef SUPPORT_LINKS
 836                 if (!S_ISLNK(st.st_mode))
 837 #endif
 838                         if (access(thisname, R_OK) != 0)
 839                                 return NULL;
 840         }
 841
 842 skip_filters:
 843
 844         if (verbose > 2) {
 845                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 846                         who_am_i(), safe_fname(thisname), filter_level);
 847         }
 848
 849         if ((basename = strrchr(thisname, '/')) != NULL) {
 850                 dirname_len = ++basename - thisname; /* counts future '\0' */
 851                 if (lastdir_len == dirname_len - 1
 852                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 853                         dirname = lastdir;
 854                         dirname_len = 0; /* indicates no copy is needed */
 855                 } else
 856                         dirname = thisname;
 857         } else {
 858                 basename = thisname;
 859                 dirname = NULL;
 860                 dirname_len = 0;
 861         }
 862         basename_len = strlen(basename) + 1; /* count the '\0' */
 863
 864 #ifdef SUPPORT_LINKS
 865         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 866 #else
 867         linkname_len = 0;
 868 #endif
 869
 870         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 871
 872         alloc_len = file_struct_len + dirname_len + basename_len
 873             + linkname_len + sum_len;
 874         if (flist) {
 875                 bp = pool_alloc(flist->file_pool, alloc_len,
 876                     "receive_file_entry");
 877         } else {
 878                 if (!(bp = new_array(char, alloc_len)))
 879                         out_of_memory("receive_file_entry");
 880         }
 881
 882         file = (struct file_struct *)bp;
 883         memset(bp, 0, file_struct_len);
 884         bp += file_struct_len;
 885
 886         file->flags = flags;
 887         file->modtime = st.st_mtime;
 888         file->length = st.st_size;
 889         file->mode = st.st_mode;
 890         file->uid = st.st_uid;
 891         file->gid = st.st_gid;
 892
 893 #ifdef SUPPORT_HARD_LINKS
 894         if (flist && flist->hlink_pool) {
 895                 if (protocol_version < 28) {
 896                         if (S_ISREG(st.st_mode))
 897                                 file->link_u.idev = pool_talloc(
 898                                     flist->hlink_pool, struct idev, 1,
 899                                     "inode_table");
 900                 } else {
 901                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 902                                 file->link_u.idev = pool_talloc(
 903                                     flist->hlink_pool, struct idev, 1,
 904                                     "inode_table");
 905                 }
 906         }
 907         if (file->link_u.idev) {
 908                 file->F_DEV = st.st_dev;
 909                 file->F_INODE = st.st_ino;
 910         }
 911 #endif
 912
 913         if (dirname_len) {
 914                 file->dirname = lastdir = bp;
 915                 lastdir_len = dirname_len - 1;
 916                 memcpy(bp, dirname, dirname_len - 1);
 917                 bp += dirname_len;
 918                 bp[-1] = '\0';
 919         } else if (dirname)
 920                 file->dirname = dirname;
 921
 922         file->basename = bp;
 923         memcpy(bp, basename, basename_len);
 924         bp += basename_len;
 925
 926 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 927         if (preserve_devices && IS_DEVICE(st.st_mode))
 928                 file->u.rdev = st.st_rdev;
 929 #endif
 930
 931 #ifdef SUPPORT_LINKS
 932         if (linkname_len) {
 933                 file->u.link = bp;
 934                 memcpy(bp, linkname, linkname_len);
 935                 bp += linkname_len;
 936         }
 937 #endif
 938
 939         if (sum_len) {
 940                 file->u.sum = bp;
 941                 file_checksum(thisname, bp, st.st_size);
 942                 /*bp += sum_len;*/
 943         }
 944
 945         file->dir.root = flist_dir;
 946
 947         /* This code is only used by the receiver when it is building
 948          * a list of files for a delete pass. */
 949         if (keep_dirlinks && linkname_len && flist) {
 950                 STRUCT_STAT st2;
 951                 int save_mode = file->mode;
 952                 file->mode = S_IFDIR; /* find a directory w/our name */
 953                 if (flist_find(received_flist, file) >= 0
 954                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 955                         file->modtime = st2.st_mtime;
 956                         file->length = st2.st_size;
 957                         file->mode = st2.st_mode;
 958                         file->uid = st2.st_uid;
 959                         file->gid = st2.st_gid;
 960                         file->u.link = NULL;
 961                 } else
 962                         file->mode = save_mode;
 963         }
 964
 965         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 966                 stats.total_size += st.st_size;
 967
 968         return file;
 969 }
 970
 971
 972 void send_file_name(int f, struct file_list *flist, char *fname,
 973                     int recursive, unsigned short base_flags)
 974 {
 975         struct file_struct *file;
 976         char fbuf[MAXPATHLEN];
 977
 978         file = make_file(fname, flist, f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 979         if (!file)
 980                 return;
 981
 982         maybe_emit_filelist_progress(flist);
 983
 984         flist_expand(flist);
 985
 986         if (file->basename[0]) {
 987                 flist->files[flist->count++] = file;
 988                 send_file_entry(file, f, base_flags);
 989         }
 990
 991         if (recursive && S_ISDIR(file->mode)
 992             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 993                 void *save_filters;
 994                 unsigned int len = strlen(fbuf);
 995                 if (len > 1 && fbuf[len-1] == '/')
 996                         fbuf[--len] = '\0';
 997                 if (len >= MAXPATHLEN - 1) {
 998                         io_error |= IOERR_GENERAL;
 999                         rprintf(FERROR, "skipping long-named directory: %s\n",
1000                                 full_fname(fbuf));
1001                         return;
1002                 }
1003                 save_filters = push_local_filters(fbuf, len);
1004                 send_directory(f, flist, fbuf, len);
1005                 pop_local_filters(save_filters);
1006         }
1007 }
1008
1009
1010 /* Note that the "recurse" value either contains -1, for infinite recursion,
1011  * or a number >= 0 indicating how many levels of recursion we will allow.
1012  * This function is normally called by the sender, but the receiving side
1013  * also calls it from delete_in_dir() with f set to -1 so that we just
1014  * construct the file list in memory without sending it over the wire.  Also,
1015  * get_dirlist() calls this with f set to -2, which indicates that local
1016  * filter rules should be ignored. */
1017 static void send_directory(int f, struct file_list *flist,
1018                            char *fbuf, unsigned int len)
1019 {
1020         struct dirent *di;
1021         char *p;
1022         DIR *d;
1023
1024         if (!(d = opendir(fbuf))) {
1025                 io_error |= IOERR_GENERAL;
1026                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1027                 return;
1028         }
1029
1030         p = fbuf + len;
1031         if (len != 1 || *fbuf != '/')
1032                 *p++ = '/';
1033         *p = '\0';
1034
1035         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1036                 char *dname = d_name(di);
1037                 if (dname[0] == '.' && (dname[1] == '\0'
1038                     || (dname[1] == '.' && dname[2] == '\0')))
1039                         continue;
1040                 if (strlcpy(p, dname, MAXPATHLEN - len) < MAXPATHLEN - len) {
1041                         int do_subdirs = recurse >= 1 ? recurse-- : recurse;
1042                         send_file_name(f, flist, fbuf, do_subdirs, 0);
1043                 } else {
1044                         io_error |= IOERR_GENERAL;
1045                         rprintf(FINFO,
1046                                 "cannot send long-named file %s\n",
1047                                 full_fname(fbuf));
1048                 }
1049         }
1050         if (errno) {
1051                 io_error |= IOERR_GENERAL;
1052                 *p = '\0';
1053                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1054         }
1055
1056         closedir(d);
1057 }
1058
1059
1060 struct file_list *send_file_list(int f, int argc, char *argv[])
1061 {
1062         int l;
1063         STRUCT_STAT st;
1064         char *p, *dir, olddir[sizeof curr_dir];
1065         char lastpath[MAXPATHLEN] = "";
1066         struct file_list *flist;
1067         struct timeval start_tv, end_tv;
1068         int64 start_write;
1069         int use_ff_fd = 0;
1070
1071         if (show_filelist_p())
1072                 start_filelist_progress("building file list");
1073
1074         start_write = stats.total_written;
1075         gettimeofday(&start_tv, NULL);
1076
1077         flist = flist_new(WITH_HLINK, "send_file_list");
1078
1079         io_start_buffering_out();
1080         if (filesfrom_fd >= 0) {
1081                 if (argv[0] && !push_dir(argv[0])) {
1082                         rsyserr(FERROR, errno, "push_dir %s failed",
1083                                 full_fname(argv[0]));
1084                         exit_cleanup(RERR_FILESELECT);
1085                 }
1086                 use_ff_fd = 1;
1087         }
1088
1089         while (1) {
1090                 char fname2[MAXPATHLEN];
1091                 char *fname = fname2;
1092                 int do_subdirs;
1093
1094                 if (use_ff_fd) {
1095                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1096                                 break;
1097                         sanitize_path(fname, fname, "", 0);
1098                 } else {
1099                         if (argc-- == 0)
1100                                 break;
1101                         strlcpy(fname, *argv++, MAXPATHLEN);
1102                         if (sanitize_paths)
1103                                 sanitize_path(fname, fname, "", 0);
1104                 }
1105
1106                 l = strlen(fname);
1107                 if (!l || fname[l - 1] == '/') {
1108                         if (l == 2 && fname[0] == '.') {
1109                                 /* Turn "./" into just "." rather than "./." */
1110                                 fname[1] = '\0';
1111                         } else if (l < MAXPATHLEN) {
1112                                 fname[l++] = '.';
1113                                 fname[l] = '\0';
1114                         }
1115                 }
1116                 if (fname[l-1] == '.' && (l == 1 || fname[l-2] == '/')) {
1117                         if (!recurse && xfer_dirs)
1118                                 recurse = 1; /* allow one level */
1119                 } else if (recurse > 0)
1120                         recurse = 0;
1121
1122                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1123                         io_error |= IOERR_GENERAL;
1124                         rsyserr(FERROR, errno, "link_stat %s failed",
1125                                 full_fname(fname));
1126                         continue;
1127                 }
1128
1129                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1130                         rprintf(FINFO, "skipping directory %s\n",
1131                                 safe_fname(fname));
1132                         continue;
1133                 }
1134
1135                 dir = NULL;
1136                 olddir[0] = '\0';
1137
1138                 if (!relative_paths) {
1139                         p = strrchr(fname, '/');
1140                         if (p) {
1141                                 *p = 0;
1142                                 if (p == fname)
1143                                         dir = "/";
1144                                 else
1145                                         dir = fname;
1146                                 fname = p + 1;
1147                         }
1148                 } else if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1149                         /* this ensures we send the intermediate directories,
1150                            thus getting their permissions right */
1151                         char *lp = lastpath, *fn = fname, *slash = fname;
1152                         *p = 0;
1153                         /* Skip any initial directories in our path that we
1154                          * have in common with lastpath. */
1155                         while (*fn && *lp == *fn) {
1156                                 if (*fn == '/')
1157                                         slash = fn;
1158                                 lp++, fn++;
1159                         }
1160                         *p = '/';
1161                         if (fn != p || (*lp && *lp != '/')) {
1162                                 int save_copy_links = copy_links;
1163                                 int save_xfer_dirs = xfer_dirs;
1164                                 copy_links = copy_unsafe_links;
1165                                 xfer_dirs = 1;
1166                                 while ((slash = strchr(slash+1, '/')) != 0) {
1167                                         *slash = 0;
1168                                         send_file_name(f, flist, fname, 0, 0);
1169                                         *slash = '/';
1170                                 }
1171                                 copy_links = save_copy_links;
1172                                 xfer_dirs = save_xfer_dirs;
1173                                 *p = 0;
1174                                 strlcpy(lastpath, fname, sizeof lastpath);
1175                                 *p = '/';
1176                         }
1177                 }
1178
1179                 if (!*fname)
1180                         fname = ".";
1181
1182                 if (dir && *dir) {
1183                         static char *lastdir;
1184                         static int lastdir_len;
1185
1186                         strcpy(olddir, curr_dir); /* can't overflow */
1187
1188                         if (!push_dir(dir)) {
1189                                 io_error |= IOERR_GENERAL;
1190                                 rsyserr(FERROR, errno, "push_dir %s failed",
1191                                         full_fname(dir));
1192                                 continue;
1193                         }
1194
1195                         if (lastdir && strcmp(lastdir, dir) == 0) {
1196                                 flist_dir = lastdir;
1197                                 flist_dir_len = lastdir_len;
1198                         } else {
1199                                 flist_dir = lastdir = strdup(dir);
1200                                 flist_dir_len = lastdir_len = strlen(dir);
1201                         }
1202                 }
1203
1204                 if (one_file_system)
1205                         filesystem_dev = st.st_dev;
1206
1207                 do_subdirs = recurse >= 1 ? recurse-- : recurse;
1208                 send_file_name(f, flist, fname, do_subdirs, XMIT_TOP_DIR);
1209
1210                 if (olddir[0]) {
1211                         flist_dir = NULL;
1212                         flist_dir_len = 0;
1213                         if (!pop_dir(olddir)) {
1214                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1215                                         full_fname(dir));
1216                                 exit_cleanup(RERR_FILESELECT);
1217                         }
1218                 }
1219         }
1220
1221         gettimeofday(&end_tv, NULL);
1222         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1223                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1224         if (stats.flist_buildtime == 0)
1225                 stats.flist_buildtime = 1;
1226         start_tv = end_tv;
1227
1228         send_file_entry(NULL, f, 0);
1229
1230         if (show_filelist_p())
1231                 finish_filelist_progress(flist);
1232
1233         gettimeofday(&end_tv, NULL);
1234         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1235                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1236
1237         if (flist->hlink_pool) {
1238                 pool_destroy(flist->hlink_pool);
1239                 flist->hlink_pool = NULL;
1240         }
1241
1242         /* Sort the list without removing any duplicates.  This allows the
1243          * receiving side to ask for any name they like, which gives us the
1244          * flexibility to change the way we unduplicate names in the future
1245          * without causing a compatibility problem with older versions. */
1246         clean_flist(flist, 0, 0);
1247
1248         /* Now send the uid/gid list. This was introduced in
1249          * protocol version 15 */
1250         send_uid_list(f);
1251
1252         /* send the io_error flag */
1253         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1254
1255         io_end_buffering();
1256         stats.flist_size = stats.total_written - start_write;
1257         stats.num_files = flist->count;
1258
1259         if (verbose > 3)
1260                 output_flist(flist, who_am_i());
1261
1262         if (verbose > 2)
1263                 rprintf(FINFO, "send_file_list done\n");
1264
1265         return flist;
1266 }
1267
1268
1269 struct file_list *recv_file_list(int f)
1270 {
1271         struct file_list *flist;
1272         unsigned short flags;
1273         int64 start_read;
1274
1275         if (show_filelist_p())
1276                 start_filelist_progress("receiving file list");
1277
1278         start_read = stats.total_read;
1279
1280         flist = flist_new(WITH_HLINK, "recv_file_list");
1281         received_flist = flist;
1282
1283         flist->count = 0;
1284         flist->malloced = 1000;
1285         flist->files = new_array(struct file_struct *, flist->malloced);
1286         if (!flist->files)
1287                 goto oom;
1288
1289
1290         while ((flags = read_byte(f)) != 0) {
1291                 struct file_struct *file;
1292
1293                 flist_expand(flist);
1294
1295                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1296                         flags |= read_byte(f) << 8;
1297                 file = receive_file_entry(flist, flags, f);
1298
1299                 if (S_ISREG(file->mode))
1300                         stats.total_size += file->length;
1301
1302                 flist->files[flist->count++] = file;
1303
1304                 maybe_emit_filelist_progress(flist);
1305
1306                 if (verbose > 2) {
1307                         rprintf(FINFO, "recv_file_name(%s)\n",
1308                                 safe_fname(f_name(file)));
1309                 }
1310         }
1311         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1312
1313         if (verbose > 2)
1314                 rprintf(FINFO, "received %d names\n", flist->count);
1315
1316         if (show_filelist_p())
1317                 finish_filelist_progress(flist);
1318
1319         clean_flist(flist, relative_paths, 1);
1320
1321         if (f >= 0) {
1322                 /* Now send the uid/gid list. This was introduced in
1323                  * protocol version 15 */
1324                 recv_uid_list(f, flist);
1325
1326                 /* Recv the io_error flag */
1327                 if (lp_ignore_errors(module_id) || ignore_errors)
1328                         read_int(f);
1329                 else
1330                         io_error |= read_int(f);
1331         }
1332
1333         if (verbose > 3)
1334                 output_flist(flist, who_am_i());
1335
1336         if (list_only) {
1337                 int i;
1338                 for (i = 0; i < flist->count; i++)
1339                         list_file_entry(flist->files[i]);
1340         }
1341
1342         if (verbose > 2)
1343                 rprintf(FINFO, "recv_file_list done\n");
1344
1345         stats.flist_size = stats.total_read - start_read;
1346         stats.num_files = flist->count;
1347
1348         return flist;
1349
1350 oom:
1351         out_of_memory("recv_file_list");
1352         return NULL;            /* not reached */
1353 }
1354
1355
1356 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1357 {
1358         return f_name_cmp(*file1, *file2);
1359 }
1360
1361
1362 /* Search for an identically-named item in the file list.  Note that the
1363  * items must agree in their directory-ness, or no match is returned. */
1364 int flist_find(struct file_list *flist, struct file_struct *f)
1365 {
1366         int low = flist->low, high = flist->high;
1367         int ret, mid, mid_up;
1368
1369         while (low <= high) {
1370                 mid = (low + high) / 2;
1371                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1372                 if (mid_up <= high)
1373                         ret = f_name_cmp(flist->files[mid_up], f);
1374                 else
1375                         ret = 1;
1376                 if (ret == 0) {
1377                         if (protocol_version < 29
1378                             && S_ISDIR(flist->files[mid_up]->mode)
1379                             != S_ISDIR(f->mode))
1380                                 return -1;
1381                         return mid_up;
1382                 }
1383                 if (ret > 0)
1384                         high = mid - 1;
1385                 else
1386                         low = mid_up + 1;
1387         }
1388         return -1;
1389 }
1390
1391
1392 /*
1393  * Free up any resources a file_struct has allocated
1394  * and clear the file.
1395  */
1396 void clear_file(int i, struct file_list *flist)
1397 {
1398         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1399                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1400         memset(flist->files[i], 0, file_struct_len);
1401 }
1402
1403
1404 /*
1405  * allocate a new file list
1406  */
1407 struct file_list *flist_new(int with_hlink, char *msg)
1408 {
1409         struct file_list *flist;
1410
1411         flist = new(struct file_list);
1412         if (!flist)
1413                 out_of_memory(msg);
1414
1415         memset(flist, 0, sizeof (struct file_list));
1416
1417         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1418             out_of_memory, POOL_INTERN)))
1419                 out_of_memory(msg);
1420
1421 #ifdef SUPPORT_HARD_LINKS
1422         if (with_hlink && preserve_hard_links) {
1423                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1424                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1425                         out_of_memory(msg);
1426         }
1427 #endif
1428
1429         return flist;
1430 }
1431
1432 /*
1433  * free up all elements in a flist
1434  */
1435 void flist_free(struct file_list *flist)
1436 {
1437         pool_destroy(flist->file_pool);
1438         pool_destroy(flist->hlink_pool);
1439         free(flist->files);
1440         free(flist);
1441 }
1442
1443
1444 /*
1445  * This routine ensures we don't have any duplicate names in our file list.
1446  * duplicate names can cause corruption because of the pipelining
1447  */
1448 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1449 {
1450         int i, prev_i = 0;
1451
1452         if (!flist || flist->count == 0)
1453                 return;
1454
1455         sorting_flist = flist;
1456         qsort(flist->files, flist->count,
1457             sizeof flist->files[0], (int (*)())file_compare);
1458         sorting_flist = NULL;
1459
1460         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1461                 if (flist->files[i]->basename) {
1462                         prev_i = i;
1463                         break;
1464                 }
1465         }
1466         flist->low = prev_i;
1467         while (++i < flist->count) {
1468                 int j;
1469                 struct file_struct *file = flist->files[i];
1470
1471                 if (!file->basename)
1472                         continue;
1473                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1474                         j = prev_i;
1475                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1476                         int save_mode = file->mode;
1477                         /* Make sure that this directory doesn't duplicate a
1478                          * non-directory earlier in the list. */
1479                         flist->high = prev_i;
1480                         file->mode = S_IFREG;
1481                         j = flist_find(flist, file);
1482                         file->mode = save_mode;
1483                 } else
1484                         j = -1;
1485                 if (j >= 0) {
1486                         struct file_struct *fp = flist->files[j];
1487                         int keep, drop;
1488                         /* If one is a dir and the other is not, we want to
1489                          * keep the dir because it might have contents in the
1490                          * list. */
1491                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1492                                 if (S_ISDIR(file->mode))
1493                                         keep = i, drop = j;
1494                                 else
1495                                         keep = j, drop = i;
1496                         } else
1497                                 keep = j, drop = i;
1498                         if (verbose > 1 && !am_server) {
1499                                 rprintf(FINFO,
1500                                         "removing duplicate name %s from file list (%d)\n",
1501                                         safe_fname(f_name(file)), drop);
1502                         }
1503                         /* Make sure that if we unduplicate '.', that we don't
1504                          * lose track of a user-specified top directory. */
1505                         if (flist->files[drop]->flags & FLAG_TOP_DIR)
1506                                 flist->files[keep]->flags |= FLAG_TOP_DIR;
1507
1508                         clear_file(drop, flist);
1509
1510                         if (keep == i) {
1511                                 if (flist->low == drop) {
1512                                         for (j = drop + 1;
1513                                              j < i && !flist->files[j]->basename;
1514                                              j++) {}
1515                                         flist->low = j;
1516                                 }
1517                                 prev_i = i;
1518                         }
1519                 } else
1520                         prev_i = i;
1521         }
1522         flist->high = no_dups ? prev_i : flist->count - 1;
1523
1524         if (strip_root) {
1525                 /* We need to strip off the leading slashes for relative
1526                  * paths, but this must be done _after_ the sorting phase. */
1527                 for (i = flist->low; i <= flist->high; i++) {
1528                         struct file_struct *file = flist->files[i];
1529
1530                         if (!file->dirname)
1531                                 continue;
1532                         if (*file->dirname == '/') {
1533                                 char *s = file->dirname + 1;
1534                                 while (*s == '/') s++;
1535                                 memmove(file->dirname, s, strlen(s) + 1);
1536                         }
1537
1538                         if (!*file->dirname)
1539                                 file->dirname = NULL;
1540                 }
1541         }
1542 }
1543
1544 static void output_flist(struct file_list *flist, const char *whose_list)
1545 {
1546         char uidbuf[16], gidbuf[16], depthbuf[16];
1547         struct file_struct *file;
1548         int i;
1549
1550         for (i = 0; i < flist->count; i++) {
1551                 file = flist->files[i];
1552                 if ((am_root || am_sender) && preserve_uid)
1553                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1554                 else
1555                         *uidbuf = '\0';
1556                 if (preserve_gid && file->gid != GID_NONE)
1557                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1558                 else
1559                         *gidbuf = '\0';
1560                 if (!am_sender)
1561                         sprintf(depthbuf, "%d", file->dir.depth);
1562                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1563                         whose_list, i, am_sender ? NS(file->dir.root) : depthbuf,
1564                         file->dirname ? safe_fname(file->dirname) : "",
1565                         file->dirname ? "/" : "", NS(file->basename),
1566                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1567                         (double)file->length, uidbuf, gidbuf, file->flags);
1568         }
1569 }
1570
1571
1572 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1573 enum fnc_type { t_PATH, t_ITEM };
1574
1575 /* Compare the names of two file_struct entities, similar to how strcmp()
1576  * would do if it were operating on the joined strings.
1577  *
1578  * Some differences beginning with protocol_version 29: (1) directory names
1579  * are compared with an assumed trailing slash so that they compare in a
1580  * way that would cause them to sort immediately prior to any content they
1581  * may have; (2) a directory of any name compares after a non-directory of
1582  * any name at the same depth; (3) a directory with name "." compares prior
1583  * to anything else.  These changes mean that a directory and a non-dir
1584  * with the same name will not compare as equal (protocol_version >= 29).
1585  *
1586  * The dirname component can be an empty string, but the basename component
1587  * cannot (and never is in the current codebase).  The basename component
1588  * may be NULL (for a removed item), in which case it is considered to be
1589  * after any existing item. */
1590 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1591 {
1592         int dif;
1593         const uchar *c1, *c2;
1594         enum fnc_state state1, state2;
1595         enum fnc_type type1, type2;
1596         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1597
1598         if (!f1 || !f1->basename) {
1599                 if (!f2 || !f2->basename)
1600                         return 0;
1601                 return -1;
1602         }
1603         if (!f2 || !f2->basename)
1604                 return 1;
1605
1606         c1 = (uchar*)f1->dirname;
1607         c2 = (uchar*)f2->dirname;
1608         if (c1 == c2)
1609                 c1 = c2 = NULL;
1610         if (!c1) {
1611                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1612                 c1 = (uchar*)f1->basename;
1613                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1614                         type1 = t_ITEM;
1615                         state1 = s_TRAILING;
1616                         c1 = (uchar*)"";
1617                 } else
1618                         state1 = s_BASE;
1619         } else if (!*c1) {
1620                 type1 = t_path;
1621                 state1 = s_SLASH;
1622                 c1 = (uchar*)"/";
1623         } else {
1624                 type1 = t_path;
1625                 state1 = s_DIR;
1626         }
1627         if (!c2) {
1628                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1629                 c2 = (uchar*)f2->basename;
1630                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1631                         type2 = t_ITEM;
1632                         state2 = s_TRAILING;
1633                         c2 = (uchar*)"";
1634                 } else
1635                         state2 = s_BASE;
1636         } else if (!*c2) {
1637                 type2 = t_path;
1638                 state2 = s_SLASH;
1639                 c2 = (uchar*)"/";
1640         } else {
1641                 type2 = t_path;
1642                 state2 = s_DIR;
1643         }
1644
1645         if (type1 != type2)
1646                 return type1 == t_PATH ? 1 : -1;
1647
1648         while (1) {
1649                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1650                         break;
1651                 if (!*c1) {
1652                         switch (state1) {
1653                         case s_DIR:
1654                                 state1 = s_SLASH;
1655                                 c1 = (uchar*)"/";
1656                                 break;
1657                         case s_SLASH:
1658                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1659                                 state1 = s_BASE;
1660                                 c1 = (uchar*)f1->basename;
1661                                 break;
1662                         case s_BASE:
1663                                 state1 = s_TRAILING;
1664                                 if (type1 == t_PATH) {
1665                                         c1 = (uchar*)"/";
1666                                         break;
1667                                 }
1668                                 /* FALL THROUGH */
1669                         case s_TRAILING:
1670                                 type1 = t_ITEM;
1671                                 break;
1672                         }
1673                         if (*c2 && type1 != type2)
1674                                 return type1 == t_PATH ? 1 : -1;
1675                 }
1676                 if (!*c2) {
1677                         switch (state2) {
1678                         case s_DIR:
1679                                 if (state1 == s_SLASH && sorting_flist) {
1680                                         int j;
1681                                         /* Optimize for future comparisons. */
1682                                         for (j = 0;
1683                                              j < sorting_flist->count;
1684                                              j++) {
1685                                                 struct file_struct *fp
1686                                                     = sorting_flist->files[j];
1687                                                 if (fp->dirname == f2->dirname)
1688                                                         fp->dirname = f1->dirname;
1689                                         }
1690                                 }
1691                                 state2 = s_SLASH;
1692                                 c2 = (uchar*)"/";
1693                                 break;
1694                         case s_SLASH:
1695                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1696                                 state2 = s_BASE;
1697                                 c2 = (uchar*)f2->basename;
1698                                 break;
1699                         case s_BASE:
1700                                 state2 = s_TRAILING;
1701                                 if (type2 == t_PATH) {
1702                                         c2 = (uchar*)"/";
1703                                         break;
1704                                 }
1705                                 /* FALL THROUGH */
1706                         case s_TRAILING:
1707                                 if (!*c1)
1708                                         return 0;
1709                                 type2 = t_ITEM;
1710                                 break;
1711                         }
1712                         if (type1 != type2)
1713                                 return type1 == t_PATH ? 1 : -1;
1714                 }
1715         }
1716
1717         return dif;
1718 }
1719
1720
1721 /* Return a copy of the full filename of a flist entry, using the indicated
1722  * buffer.  No size-checking is done because we checked the size when creating
1723  * the file_struct entry.
1724  */
1725 char *f_name_to(struct file_struct *f, char *fbuf)
1726 {
1727         if (!f || !f->basename)
1728                 return NULL;
1729
1730         if (f->dirname) {
1731                 int len = strlen(f->dirname);
1732                 memcpy(fbuf, f->dirname, len);
1733                 fbuf[len] = '/';
1734                 strcpy(fbuf + len + 1, f->basename);
1735         } else
1736                 strcpy(fbuf, f->basename);
1737         return fbuf;
1738 }
1739
1740
1741 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1742 char *f_name(struct file_struct *f)
1743 {
1744         static char names[5][MAXPATHLEN];
1745         static unsigned int n;
1746
1747         n = (n + 1) % (sizeof names / sizeof names[0]);
1748
1749         return f_name_to(f, names[n]);
1750 }
1751
1752
1753 struct file_list *get_dirlist(const char *dirname, int ignore_filter_rules)
1754 {
1755         struct file_list *dirlist;
1756         char dirbuf[MAXPATHLEN];
1757         int dlen;
1758         int save_recurse = recurse;
1759
1760         dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1761         if (dlen >= MAXPATHLEN)
1762                 return NULL;
1763
1764         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1765         recurse = 0;
1766         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirbuf, dlen);
1767         recurse = save_recurse;
1768
1769         clean_flist(dirlist, 0, 0);
1770
1771         return dirlist;
1772 }
1773
1774
1775 static int deletion_count = 0; /* used to implement --max-delete */
1776
1777 static int is_backup_file(char *fn)
1778 {
1779         int k = strlen(fn) - backup_suffix_len;
1780         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
1781 }
1782
1783
1784 /* Delete a file or directory.  If DEL_FORCE_RECURSE is set in the flags, or if
1785  * force_delete is set, this will delete recursively as long as DEL_NO_RECURSE
1786  * is not set in the flags. */
1787 int delete_file(char *fname, int mode, int flags)
1788 {
1789         struct file_list *dirlist;
1790         char buf[MAXPATHLEN];
1791         int j, zap_dir, ok;
1792         void *save_filters;
1793
1794         if (max_delete && deletion_count >= max_delete)
1795                 return -1;
1796
1797         if (!S_ISDIR(mode)) {
1798                 if (make_backups && (backup_dir || !is_backup_file(fname)))
1799                         ok = make_backup(fname);
1800                 else
1801                         ok = robust_unlink(fname) == 0;
1802                 if (ok) {
1803                         if (!(flags & DEL_TERSE))
1804                                 log_delete(fname, mode);
1805                         deletion_count++;
1806                         return 0;
1807                 }
1808                 if (errno == ENOENT)
1809                         return 0;
1810                 rsyserr(FERROR, errno, "delete_file: unlink %s failed",
1811                         full_fname(fname));
1812                 return -1;
1813         }
1814
1815         zap_dir = (flags & DEL_FORCE_RECURSE || (force_delete && recurse))
1816                 && !(flags & DEL_NO_RECURSE);
1817         if (dry_run && zap_dir) {
1818                 ok = 0;
1819                 errno = ENOTEMPTY;
1820         } else if (make_backups && !backup_dir && !is_backup_file(fname)
1821             && !(flags & DEL_FORCE_RECURSE))
1822                 ok = make_backup(fname);
1823         else
1824                 ok = do_rmdir(fname) == 0;
1825         if (ok) {
1826                 if (!(flags & DEL_TERSE))
1827                         log_delete(fname, mode);
1828                 deletion_count++;
1829                 return 0;
1830         }
1831         if (errno == ENOENT)
1832                 return 0;
1833         if (!zap_dir || (errno != ENOTEMPTY && errno != EEXIST)) {
1834                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
1835                         full_fname(fname));
1836                 return -1;
1837         }
1838         flags |= DEL_FORCE_RECURSE;
1839
1840         save_filters = push_local_filters(fname, strlen(fname));
1841
1842         dirlist = get_dirlist(fname, 0);
1843         for (j = dirlist->count; j--; ) {
1844                 struct file_struct *fp = dirlist->files[j];
1845                 f_name_to(fp, buf);
1846                 if (delete_file(buf, fp->mode, flags & ~DEL_TERSE) != 0) {
1847                         flist_free(dirlist);
1848                         return -1;
1849                 }
1850         }
1851         flist_free(dirlist);
1852
1853         pop_local_filters(save_filters);
1854
1855         if (max_delete && deletion_count >= max_delete)
1856                 return -1;
1857
1858         if (do_rmdir(fname) == 0) {
1859                 if (!(flags & DEL_TERSE))
1860                         log_delete(fname, mode);
1861                 deletion_count++;
1862         } else if (errno != ENOTEMPTY && errno != ENOENT) {
1863                 rsyserr(FERROR, errno, "delete_file: rmdir %s failed",
1864                         full_fname(fname));
1865                 return -1;
1866         }
1867
1868         return 0;
1869 }
1870
1871
1872 /* If an item in dir_list is not found in full_list, delete it from the
1873  * filesystem. */
1874 static void delete_missing(struct file_list *full_list,
1875                            struct file_list *dir_list, const char *dirname)
1876 {
1877         char fbuf[MAXPATHLEN];
1878         int i;
1879
1880         if (max_delete && deletion_count >= max_delete)
1881                 return;
1882
1883         if (verbose > 2)
1884                 rprintf(FINFO, "delete_missing(%s)\n", safe_fname(dirname));
1885
1886         for (i = dir_list->count; i--; ) {
1887                 if (!dir_list->files[i]->basename)
1888                         continue;
1889                 if (flist_find(full_list, dir_list->files[i]) < 0) {
1890                         char *fn = f_name_to(dir_list->files[i], fbuf);
1891                         int mode = dir_list->files[i]->mode;
1892                         if (delete_file(fn, mode, DEL_FORCE_RECURSE) < 0)
1893                                 break;
1894                 }
1895         }
1896 }
1897
1898
1899 /* This function is used to implement per-directory deletion, and
1900  * is used by all the --delete-WHEN options.  Note that the fbuf
1901  * pointer must point to a MAXPATHLEN buffer with the name of the
1902  * directory in it (the functions we call will append names onto
1903  * the end, but the old dir value will be restored on exit). */
1904 void delete_in_dir(struct file_list *flist, char *fbuf,
1905                    struct file_struct *file)
1906 {
1907         static int min_depth = MAXPATHLEN, cur_depth = -1;
1908         static void *filt_array[MAXPATHLEN/2+1];
1909         struct file_list *dir_list;
1910         STRUCT_STAT st;
1911         int dlen;
1912
1913         if (!flist) {
1914                 while (cur_depth >= min_depth)
1915                         pop_local_filters(filt_array[cur_depth--]);
1916                 min_depth = MAXPATHLEN;
1917                 cur_depth = -1;
1918                 return;
1919         }
1920         if (file->dir.depth >= MAXPATHLEN/2+1)
1921                 return; /* Impossible... */
1922
1923         if (max_delete && deletion_count >= max_delete)
1924                 return;
1925
1926         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
1927                 rprintf(FINFO,
1928                         "IO error encountered -- skipping file deletion\n");
1929                 max_delete = -1; /* avoid duplicating the above warning */
1930                 return;
1931         }
1932
1933         while (cur_depth >= file->dir.depth && cur_depth >= min_depth)
1934                 pop_local_filters(filt_array[cur_depth--]);
1935         cur_depth = file->dir.depth;
1936         if (min_depth > cur_depth)
1937                 min_depth = cur_depth;
1938         dlen = strlen(fbuf);
1939         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
1940
1941         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
1942                 return;
1943
1944         if (one_file_system && file->flags & FLAG_TOP_DIR)
1945                 filesystem_dev = st.st_dev;
1946
1947         dir_list = flist_new(WITHOUT_HLINK, "delete_in_dir");
1948
1949         recurse = 0;
1950         send_directory(-1, dir_list, fbuf, dlen);
1951         recurse = -1;
1952         fbuf[dlen] = '\0';
1953
1954         clean_flist(dir_list, 0, 0);
1955
1956         if (verbose > 3)
1957                 output_flist(dir_list, "delete");
1958
1959         delete_missing(flist, dir_list, fbuf);
1960
1961         flist_free(dir_list);
1962 }