flist.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /** @file flist.c
  22  * Generate and receive file lists
  23  *
  24  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
  25  *
  26  **/
  27
  28 #include "rsync.h"
  29
  30 extern struct stats stats;
  31
  32 extern int verbose;
  33 extern int do_progress;
  34 extern int am_root;
  35 extern int am_server;
  36 extern int am_daemon;
  37 extern int am_sender;
  38 extern int delete_during;
  39 extern int always_checksum;
  40 extern int module_id;
  41 extern int ignore_errors;
  42 extern int numeric_ids;
  43
  44 extern int recurse;
  45 extern int xfer_dirs;
  46 extern char curr_dir[MAXPATHLEN];
  47 extern unsigned int curr_dir_len;
  48 extern char *backup_dir;
  49 extern char *backup_suffix;
  50 extern int filesfrom_fd;
  51
  52 extern int one_file_system;
  53 extern int keep_dirlinks;
  54 extern int preserve_links;
  55 extern int preserve_hard_links;
  56 extern int preserve_perms;
  57 extern int preserve_devices;
  58 extern int preserve_uid;
  59 extern int preserve_gid;
  60 extern int relative_paths;
  61 extern int implied_dirs;
  62 extern int make_backups;
  63 extern int backup_suffix_len;
  64 extern int copy_links;
  65 extern int copy_unsafe_links;
  66 extern int protocol_version;
  67 extern int sanitize_paths;
  68 extern int delete_excluded;
  69 extern int max_delete;
  70 extern int orig_umask;
  71 extern int list_only;
  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;
  81 static dev_t filesystem_dev; /* used to implement -x */
  82 static int deletion_count = 0; /* used to implement --max-delete */
  83
  84 static int flist_find(struct file_list *flist, struct file_struct *f);
  85 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  86 static void output_flist(struct file_list *flist, const char *whose_list);
  87
  88 void init_flist(void)
  89 {
  90         struct file_struct f;
  91
  92         /* Figure out how big the file_struct is without trailing padding */
  93         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  94 }
  95
  96
  97 static int show_filelist_p(void)
  98 {
  99         return verbose && xfer_dirs && !am_server;
 100 }
 101
 102 static void start_filelist_progress(char *kind)
 103 {
 104         rprintf(FINFO, "%s ... ", kind);
 105         if (verbose > 1 || do_progress)
 106                 rprintf(FINFO, "\n");
 107         rflush(FINFO);
 108 }
 109
 110
 111 static void emit_filelist_progress(const struct file_list *flist)
 112 {
 113         rprintf(FINFO, " %d files...\r", flist->count);
 114 }
 115
 116
 117 static void maybe_emit_filelist_progress(const struct file_list *flist)
 118 {
 119         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
 120                 emit_filelist_progress(flist);
 121 }
 122
 123
 124 static void finish_filelist_progress(const struct file_list *flist)
 125 {
 126         if (do_progress) {
 127                 /* This overwrites the progress line */
 128                 rprintf(FINFO, "%d file%sto consider\n",
 129                         flist->count, flist->count == 1 ? " " : "s ");
 130         } else
 131                 rprintf(FINFO, "done\n");
 132 }
 133
 134 void show_flist_stats(void)
 135 {
 136         /* Nothing yet */
 137 }
 138
 139
 140 static void list_file_entry(struct file_struct *f)
 141 {
 142         char perms[11];
 143
 144         if (!f->basename) {
 145                 /* this can happen if duplicate names were removed */
 146                 return;
 147         }
 148
 149         permstring(perms, f->mode);
 150
 151 #if SUPPORT_LINKS
 152         if (preserve_links && S_ISLNK(f->mode)) {
 153                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 154                         perms,
 155                         (double)f->length, timestring(f->modtime),
 156                         f_name(f), f->u.link);
 157         } else
 158 #endif
 159         {
 160                 rprintf(FINFO, "%s %11.0f %s %s\n",
 161                         perms,
 162                         (double)f->length, timestring(f->modtime),
 163                         f_name(f));
 164         }
 165 }
 166
 167
 168 /**
 169  * Stat either a symlink or its referent, depending on the settings of
 170  * copy_links, copy_unsafe_links, etc.
 171  *
 172  * @retval -1 on error
 173  *
 174  * @retval 0 for success
 175  *
 176  * @post If @p path is a symlink, then @p linkbuf (of size @c
 177  * MAXPATHLEN) contains the symlink target.
 178  *
 179  * @post @p buffer contains information about the link or the
 180  * referrent as appropriate, if they exist.
 181  **/
 182 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 183 {
 184 #if SUPPORT_LINKS
 185         if (copy_links)
 186                 return do_stat(path, buffer);
 187         if (link_stat(path, buffer, 0) < 0)
 188                 return -1;
 189         if (S_ISLNK(buffer->st_mode)) {
 190                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 191                 if (l == -1)
 192                         return -1;
 193                 linkbuf[l] = 0;
 194                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 195                         if (verbose > 1) {
 196                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 197                                         path, linkbuf);
 198                         }
 199                         return do_stat(path, buffer);
 200                 }
 201         }
 202         return 0;
 203 #else
 204         return do_stat(path, buffer);
 205 #endif
 206 }
 207
 208 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 209 {
 210 #if SUPPORT_LINKS
 211         if (copy_links)
 212                 return do_stat(path, buffer);
 213         if (do_lstat(path, buffer) < 0)
 214                 return -1;
 215         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 216                 STRUCT_STAT st;
 217                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 218                         *buffer = st;
 219         }
 220         return 0;
 221 #else
 222         return do_stat(path, buffer);
 223 #endif
 224 }
 225
 226 /* This function is used to check if a file should be included/excluded
 227  * from the list of files based on its name and type etc.  The value of
 228  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 229 static int is_excluded(char *fname, int is_dir, int filter_level)
 230 {
 231 #if 0 /* This currently never happens, so avoid a useless compare. */
 232         if (filter_level == NO_FILTERS)
 233                 return 0;
 234 #endif
 235         if (fname) {
 236                 /* never exclude '.', even if somebody does --exclude '*' */
 237                 if (fname[0] == '.' && !fname[1])
 238                         return 0;
 239                 /* Handle the -R version of the '.' dir. */
 240                 if (fname[0] == '/') {
 241                         int len = strlen(fname);
 242                         if (fname[len-1] == '.' && fname[len-2] == '/')
 243                                 return 0;
 244                 }
 245         }
 246         if (server_filter_list.head
 247             && check_filter(&server_filter_list, fname, is_dir) < 0)
 248                 return 1;
 249         if (filter_level != ALL_FILTERS)
 250                 return 0;
 251         if (filter_list.head
 252             && check_filter(&filter_list, fname, is_dir) < 0)
 253                 return 1;
 254         return 0;
 255 }
 256
 257 static int to_wire_mode(mode_t mode)
 258 {
 259 #if SUPPORT_LINKS
 260         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 261                 return (mode & ~(_S_IFMT)) | 0120000;
 262 #endif
 263         return (int)mode;
 264 }
 265
 266 static mode_t from_wire_mode(int mode)
 267 {
 268         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 269                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 270         return (mode_t)mode;
 271 }
 272
 273
 274 static void send_directory(int f, struct file_list *flist,
 275                            char *fbuf, unsigned int offset);
 276
 277 static char *flist_dir;
 278 static int flist_dir_len;
 279
 280
 281 /**
 282  * Make sure @p flist is big enough to hold at least @p flist->count
 283  * entries.
 284  **/
 285 void flist_expand(struct file_list *flist)
 286 {
 287         struct file_struct **new_ptr;
 288
 289         if (flist->count < flist->malloced)
 290                 return;
 291
 292         if (flist->malloced < FLIST_START)
 293                 flist->malloced = FLIST_START;
 294         else if (flist->malloced >= FLIST_LINEAR)
 295                 flist->malloced += FLIST_LINEAR;
 296         else
 297                 flist->malloced *= 2;
 298
 299         /*
 300          * In case count jumped or we are starting the list
 301          * with a known size just set it.
 302          */
 303         if (flist->malloced < flist->count)
 304                 flist->malloced = flist->count;
 305
 306         new_ptr = realloc_array(flist->files, struct file_struct *,
 307                                 flist->malloced);
 308
 309         if (verbose >= 2 && flist->malloced != FLIST_START) {
 310                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 311                     who_am_i(),
 312                     (double)sizeof flist->files[0] * flist->malloced,
 313                     (new_ptr == flist->files) ? " not" : "");
 314         }
 315
 316         flist->files = new_ptr;
 317
 318         if (!flist->files)
 319                 out_of_memory("flist_expand");
 320 }
 321
 322 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 323 {
 324         unsigned short flags;
 325         static time_t modtime;
 326         static mode_t mode;
 327         static int64 dev;
 328         static dev_t rdev;
 329         static uint32 rdev_major;
 330         static uid_t uid;
 331         static gid_t gid;
 332         static char lastname[MAXPATHLEN];
 333         char fname[MAXPATHLEN];
 334         int l1, l2;
 335
 336         if (f == -1)
 337                 return;
 338
 339         if (!file) {
 340                 write_byte(f, 0);
 341                 modtime = 0, mode = 0;
 342                 dev = 0, rdev = makedev(0, 0);
 343                 rdev_major = 0;
 344                 uid = 0, gid = 0;
 345                 *lastname = '\0';
 346                 return;
 347         }
 348
 349         io_write_phase = "send_file_entry";
 350
 351         f_name_to(file, fname);
 352
 353         flags = base_flags;
 354
 355         if (file->mode == mode)
 356                 flags |= XMIT_SAME_MODE;
 357         else
 358                 mode = file->mode;
 359         if (preserve_devices) {
 360                 if (protocol_version < 28) {
 361                         if (IS_DEVICE(mode)) {
 362                                 if (file->u.rdev == rdev)
 363                                         flags |= XMIT_SAME_RDEV_pre28;
 364                                 else
 365                                         rdev = file->u.rdev;
 366                         } else
 367                                 rdev = makedev(0, 0);
 368                 } else if (IS_DEVICE(mode)) {
 369                         rdev = file->u.rdev;
 370                         if ((uint32)major(rdev) == rdev_major)
 371                                 flags |= XMIT_SAME_RDEV_MAJOR;
 372                         else
 373                                 rdev_major = major(rdev);
 374                         if ((uint32)minor(rdev) <= 0xFFu)
 375                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 376                 }
 377         }
 378         if (file->uid == uid)
 379                 flags |= XMIT_SAME_UID;
 380         else
 381                 uid = file->uid;
 382         if (file->gid == gid)
 383                 flags |= XMIT_SAME_GID;
 384         else
 385                 gid = file->gid;
 386         if (file->modtime == modtime)
 387                 flags |= XMIT_SAME_TIME;
 388         else
 389                 modtime = file->modtime;
 390
 391 #if SUPPORT_HARD_LINKS
 392         if (file->link_u.idev) {
 393                 if (file->F_DEV == dev) {
 394                         if (protocol_version >= 28)
 395                                 flags |= XMIT_SAME_DEV;
 396                 } else
 397                         dev = file->F_DEV;
 398                 flags |= XMIT_HAS_IDEV_DATA;
 399         }
 400 #endif
 401
 402         for (l1 = 0;
 403             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 404             l1++) {}
 405         l2 = strlen(fname+l1);
 406
 407         if (l1 > 0)
 408                 flags |= XMIT_SAME_NAME;
 409         if (l2 > 255)
 410                 flags |= XMIT_LONG_NAME;
 411
 412         /* We must make sure we don't send a zero flag byte or the
 413          * other end will terminate the flist transfer.  Note that
 414          * the use of XMIT_DEL_START on a non-dir has no meaning, so
 415          * it's harmless way to add a bit to the first flag byte. */
 416         if (protocol_version >= 28) {
 417                 if (!flags && !S_ISDIR(mode))
 418                         flags |= XMIT_DEL_START;
 419                 if ((flags & 0xFF00) || !flags) {
 420                         flags |= XMIT_EXTENDED_FLAGS;
 421                         write_byte(f, flags);
 422                         write_byte(f, flags >> 8);
 423                 } else
 424                         write_byte(f, flags);
 425         } else {
 426                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 427                         flags |= XMIT_DEL_START;
 428                 if (!(flags & 0xFF))
 429                         flags |= XMIT_LONG_NAME;
 430                 write_byte(f, flags);
 431         }
 432         if (flags & XMIT_SAME_NAME)
 433                 write_byte(f, l1);
 434         if (flags & XMIT_LONG_NAME)
 435                 write_int(f, l2);
 436         else
 437                 write_byte(f, l2);
 438         write_buf(f, fname + l1, l2);
 439
 440         write_longint(f, file->length);
 441         if (!(flags & XMIT_SAME_TIME))
 442                 write_int(f, modtime);
 443         if (!(flags & XMIT_SAME_MODE))
 444                 write_int(f, to_wire_mode(mode));
 445         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 446                 if (!numeric_ids)
 447                         add_uid(uid);
 448                 write_int(f, uid);
 449         }
 450         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 451                 if (!numeric_ids)
 452                         add_gid(gid);
 453                 write_int(f, gid);
 454         }
 455         if (preserve_devices && IS_DEVICE(mode)) {
 456                 if (protocol_version < 28) {
 457                         if (!(flags & XMIT_SAME_RDEV_pre28))
 458                                 write_int(f, (int)rdev);
 459                 } else {
 460                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 461                                 write_int(f, major(rdev));
 462                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 463                                 write_byte(f, minor(rdev));
 464                         else
 465                                 write_int(f, minor(rdev));
 466                 }
 467         }
 468
 469 #if SUPPORT_LINKS
 470         if (preserve_links && S_ISLNK(mode)) {
 471                 int len = strlen(file->u.link);
 472                 write_int(f, len);
 473                 write_buf(f, file->u.link, len);
 474         }
 475 #endif
 476
 477 #if SUPPORT_HARD_LINKS
 478         if (flags & XMIT_HAS_IDEV_DATA) {
 479                 if (protocol_version < 26) {
 480                         /* 32-bit dev_t and ino_t */
 481                         write_int(f, dev);
 482                         write_int(f, file->F_INODE);
 483                 } else {
 484                         /* 64-bit dev_t and ino_t */
 485                         if (!(flags & XMIT_SAME_DEV))
 486                                 write_longint(f, dev);
 487                         write_longint(f, file->F_INODE);
 488                 }
 489         }
 490 #endif
 491
 492         if (always_checksum) {
 493                 char *sum;
 494                 if (S_ISREG(mode))
 495                         sum = file->u.sum;
 496                 else if (protocol_version < 28) {
 497                         /* Prior to 28, we sent a useless set of nulls. */
 498                         sum = empty_sum;
 499                 } else
 500                         sum = NULL;
 501                 if (sum) {
 502                         write_buf(f, sum,
 503                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 504                 }
 505         }
 506
 507         strlcpy(lastname, fname, MAXPATHLEN);
 508
 509         io_write_phase = "unknown";
 510 }
 511
 512
 513
 514 static void receive_file_entry(struct file_list *flist, int ndx,
 515                                unsigned short flags, int f)
 516 {
 517         static time_t modtime;
 518         static mode_t mode;
 519         static int64 dev;
 520         static dev_t rdev;
 521         static uint32 rdev_major;
 522         static uid_t uid;
 523         static gid_t gid;
 524         static char lastname[MAXPATHLEN], *lastdir;
 525         static int lastdir_depth, lastdir_len = -1;
 526         static unsigned int del_hier_name_len = 0;
 527         static int in_del_hier = 0;
 528         char thisname[MAXPATHLEN];
 529         unsigned int l1 = 0, l2 = 0;
 530         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 531         OFF_T file_length;
 532         char *basename, *dirname, *bp;
 533         struct file_struct *file;
 534
 535         if (!flist) {
 536                 modtime = 0, mode = 0;
 537                 dev = 0, rdev = makedev(0, 0);
 538                 rdev_major = 0;
 539                 uid = 0, gid = 0;
 540                 *lastname = '\0';
 541                 lastdir_len = -1;
 542                 in_del_hier = 0;
 543                 return;
 544         }
 545
 546         if (flags & XMIT_SAME_NAME)
 547                 l1 = read_byte(f);
 548
 549         if (flags & XMIT_LONG_NAME)
 550                 l2 = read_int(f);
 551         else
 552                 l2 = read_byte(f);
 553
 554         if (l2 >= MAXPATHLEN - l1) {
 555                 rprintf(FERROR,
 556                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 557                         flags, l1, l2, lastname);
 558                 overflow("receive_file_entry");
 559         }
 560
 561         strlcpy(thisname, lastname, l1 + 1);
 562         read_sbuf(f, &thisname[l1], l2);
 563         thisname[l1 + l2] = 0;
 564
 565         strlcpy(lastname, thisname, MAXPATHLEN);
 566
 567         clean_fname(thisname, 0);
 568
 569         if (sanitize_paths)
 570                 sanitize_path(thisname, thisname, "", 0);
 571
 572         if ((basename = strrchr(thisname, '/')) != NULL) {
 573                 dirname_len = ++basename - thisname; /* counts future '\0' */
 574                 if (lastdir_len == dirname_len - 1
 575                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 576                         dirname = lastdir;
 577                         dirname_len = 0; /* indicates no copy is needed */
 578                 } else
 579                         dirname = thisname;
 580         } else {
 581                 basename = thisname;
 582                 dirname = NULL;
 583                 dirname_len = 0;
 584         }
 585         basename_len = strlen(basename) + 1; /* count the '\0' */
 586
 587         file_length = read_longint(f);
 588         if (!(flags & XMIT_SAME_TIME))
 589                 modtime = (time_t)read_int(f);
 590         if (!(flags & XMIT_SAME_MODE))
 591                 mode = from_wire_mode(read_int(f));
 592
 593         if (preserve_uid && !(flags & XMIT_SAME_UID))
 594                 uid = (uid_t)read_int(f);
 595         if (preserve_gid && !(flags & XMIT_SAME_GID))
 596                 gid = (gid_t)read_int(f);
 597
 598         if (preserve_devices) {
 599                 if (protocol_version < 28) {
 600                         if (IS_DEVICE(mode)) {
 601                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 602                                         rdev = (dev_t)read_int(f);
 603                         } else
 604                                 rdev = makedev(0, 0);
 605                 } else if (IS_DEVICE(mode)) {
 606                         uint32 rdev_minor;
 607                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 608                                 rdev_major = read_int(f);
 609                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 610                                 rdev_minor = read_byte(f);
 611                         else
 612                                 rdev_minor = read_int(f);
 613                         rdev = makedev(rdev_major, rdev_minor);
 614                 }
 615         }
 616
 617 #if SUPPORT_LINKS
 618         if (preserve_links && S_ISLNK(mode)) {
 619                 linkname_len = read_int(f) + 1; /* count the '\0' */
 620                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 621                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 622                                 linkname_len - 1);
 623                         overflow("receive_file_entry");
 624                 }
 625         }
 626         else
 627 #endif
 628                 linkname_len = 0;
 629
 630         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 631
 632         alloc_len = file_struct_len + dirname_len + basename_len
 633                   + linkname_len + sum_len;
 634         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 635
 636         file = flist->files[ndx] = (struct file_struct *)bp;
 637         memset(bp, 0, file_struct_len);
 638         bp += file_struct_len;
 639
 640         file->flags = 0;
 641         file->modtime = modtime;
 642         file->length = file_length;
 643         file->mode = mode;
 644         file->uid = uid;
 645         file->gid = gid;
 646
 647         if (dirname_len) {
 648                 file->dirname = lastdir = bp;
 649                 lastdir_len = dirname_len - 1;
 650                 memcpy(bp, dirname, dirname_len - 1);
 651                 bp += dirname_len;
 652                 bp[-1] = '\0';
 653                 lastdir_depth = count_dir_elements(lastdir);
 654                 file->dir.depth = lastdir_depth + 1;
 655         } else if (dirname) {
 656                 file->dirname = dirname; /* we're reusing lastname */
 657                 file->dir.depth = lastdir_depth + 1;
 658         } else
 659                 file->dir.depth = 1;
 660
 661         if (S_ISDIR(mode)) {
 662                 if (basename_len == 1+1 && *basename == '.') /* N.B. null */
 663                         file->dir.depth--;
 664                 if (flags & XMIT_DEL_START) {
 665                         in_del_hier = 1;
 666                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 667                         file->flags |= FLAG_DEL_START;
 668                 } else if (delete_during && in_del_hier) {
 669                         if (!relative_paths || !del_hier_name_len
 670                          || (l1 >= del_hier_name_len
 671                           && thisname[del_hier_name_len] == '/'))
 672                                 file->flags |= FLAG_DEL_START;
 673                         else
 674                                 in_del_hier = 0;
 675                 }
 676         }
 677
 678         file->basename = bp;
 679         memcpy(bp, basename, basename_len);
 680         bp += basename_len;
 681
 682         if (preserve_devices && IS_DEVICE(mode))
 683                 file->u.rdev = rdev;
 684
 685 #if SUPPORT_LINKS
 686         if (linkname_len) {
 687                 file->u.link = bp;
 688                 read_sbuf(f, bp, linkname_len - 1);
 689                 if (sanitize_paths)
 690                         sanitize_path(bp, bp, "", lastdir_depth);
 691                 bp += linkname_len;
 692         }
 693 #endif
 694
 695 #if SUPPORT_HARD_LINKS
 696         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 697                 flags |= XMIT_HAS_IDEV_DATA;
 698         if (flags & XMIT_HAS_IDEV_DATA) {
 699                 int64 inode;
 700                 if (protocol_version < 26) {
 701                         dev = read_int(f);
 702                         inode = read_int(f);
 703                 } else {
 704                         if (!(flags & XMIT_SAME_DEV))
 705                                 dev = read_longint(f);
 706                         inode = read_longint(f);
 707                 }
 708                 if (flist->hlink_pool) {
 709                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 710                             struct idev, 1, "inode_table");
 711                         file->F_INODE = inode;
 712                         file->F_DEV = dev;
 713                 }
 714         }
 715 #endif
 716
 717         if (always_checksum) {
 718                 char *sum;
 719                 if (sum_len) {
 720                         file->u.sum = sum = bp;
 721                         /*bp += sum_len;*/
 722                 } else if (protocol_version < 28) {
 723                         /* Prior to 28, we get a useless set of nulls. */
 724                         sum = empty_sum;
 725                 } else
 726                         sum = NULL;
 727                 if (sum) {
 728                         read_buf(f, sum,
 729                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 730                 }
 731         }
 732
 733         if (!preserve_perms) {
 734                 /* set an appropriate set of permissions based on original
 735                  * permissions and umask. This emulates what GNU cp does */
 736                 file->mode &= ~orig_umask;
 737         }
 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", 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 #if 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", 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 #if 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(), 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 #if 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 #if 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 #if 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 #if 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 i = flist_find(received_flist, file);
 952                 if (i >= 0 && S_ISDIR(received_flist->files[i]->mode)
 953                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 954                         file->modtime = st2.st_mtime;
 955                         file->length = st2.st_size;
 956                         file->mode = st2.st_mode;
 957                         file->uid = st2.st_uid;
 958                         file->gid = st2.st_gid;
 959                         file->u.link = NULL;
 960                         if (file->link_u.idev) {
 961                                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
 962                                 file->link_u.idev = NULL;
 963                         }
 964                 }
 965         }
 966
 967         if (!S_ISDIR(st.st_mode))
 968                 stats.total_size += st.st_size;
 969
 970         return file;
 971 }
 972
 973
 974 void send_file_name(int f, struct file_list *flist, char *fname,
 975                     int recursive, unsigned short base_flags)
 976 {
 977         struct file_struct *file;
 978         char fbuf[MAXPATHLEN];
 979
 980         /* f is set to -1 when calculating deletion file list */
 981         file = make_file(fname, flist,
 982             f == -1 && delete_excluded? SERVER_FILTERS : ALL_FILTERS);
 983
 984         if (!file)
 985                 return;
 986
 987         maybe_emit_filelist_progress(flist);
 988
 989         flist_expand(flist);
 990
 991         if (file->basename[0]) {
 992                 flist->files[flist->count++] = file;
 993                 send_file_entry(file, f, base_flags);
 994         }
 995
 996         if (recursive && S_ISDIR(file->mode)
 997             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 998                 void *save_filters;
 999                 unsigned int len = strlen(fbuf);
1000                 if (len > 1 && fbuf[len-1] == '/')
1001                         fbuf[--len] = '\0';
1002                 if (len >= MAXPATHLEN - 1) {
1003                         io_error |= IOERR_GENERAL;
1004                         rprintf(FERROR, "skipping long-named directory: %s\n",
1005                                 full_fname(fbuf));
1006                         return;
1007                 }
1008                 save_filters = push_local_filters(fbuf, len);
1009                 send_directory(f, flist, fbuf, len);
1010                 pop_local_filters(save_filters);
1011         }
1012 }
1013
1014
1015 /* Note that the "recurse" value either contains -1, for infinite recursion,
1016  * or a number >= 0 indicating how many levels of recursion we will allow. */
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)", fbuf);
1054         }
1055
1056         closedir(d);
1057 }
1058
1059
1060 /* This function is normally called by the sender, but the receiving side
1061  * also uses it to construct one or more file lists if one of the --delete
1062  * options have been specified.  The delete_files() function sets f to -1
1063  * so that we just construct the file list in memory without sending it
1064  * over the wire.  It also has the side-effect of ignoring user-excludes if
1065  * delete_excluded is set (so that the delete list includes user-excluded
1066  * files). */
1067 struct file_list *send_file_list(int f, int argc, char *argv[])
1068 {
1069         int l;
1070         STRUCT_STAT st;
1071         char *p, *dir, olddir[sizeof curr_dir];
1072         char lastpath[MAXPATHLEN] = "";
1073         struct file_list *flist;
1074         struct timeval start_tv, end_tv;
1075         int64 start_write;
1076         int use_ff_fd = 0;
1077
1078         if (show_filelist_p() && f != -1)
1079                 start_filelist_progress("building file list");
1080
1081         start_write = stats.total_written;
1082         gettimeofday(&start_tv, NULL);
1083
1084         flist = flist_new(f == -1 ? WITHOUT_HLINK : WITH_HLINK,
1085                           "send_file_list");
1086
1087         if (f != -1) {
1088                 io_start_buffering_out();
1089                 if (filesfrom_fd >= 0) {
1090                         if (argv[0] && !push_dir(argv[0])) {
1091                                 rsyserr(FERROR, errno, "push_dir %s failed",
1092                                         full_fname(argv[0]));
1093                                 exit_cleanup(RERR_FILESELECT);
1094                         }
1095                         use_ff_fd = 1;
1096                 }
1097         }
1098
1099         while (1) {
1100                 char fname2[MAXPATHLEN];
1101                 char *fname = fname2;
1102                 int do_subdirs;
1103
1104                 if (use_ff_fd) {
1105                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1106                                 break;
1107                         sanitize_path(fname, fname, "", 0);
1108                 } else {
1109                         if (argc-- == 0)
1110                                 break;
1111                         strlcpy(fname, *argv++, MAXPATHLEN);
1112                         if (sanitize_paths)
1113                                 sanitize_path(fname, fname, "", 0);
1114                 }
1115
1116                 l = strlen(fname);
1117                 if (!l || fname[l - 1] == '/') {
1118                         if (l == 2 && fname[0] == '.') {
1119                                 /* Turn "./" into just "." rather than "./." */
1120                                 fname[1] = '\0';
1121                         } else if (l < MAXPATHLEN) {
1122                                 fname[l++] = '.';
1123                                 fname[l] = '\0';
1124                         }
1125                 }
1126                 if (fname[l-1] == '.' && (l == 1 || fname[l-2] == '/')) {
1127                         if (!recurse && xfer_dirs)
1128                                 recurse = 1; /* allow one level */
1129                 } else if (recurse > 0)
1130                         recurse = 0;
1131
1132                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1133                         if (f != -1) {
1134                                 io_error |= IOERR_GENERAL;
1135                                 rsyserr(FERROR, errno, "link_stat %s failed",
1136                                         full_fname(fname));
1137                         }
1138                         continue;
1139                 }
1140
1141                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1142                         rprintf(FINFO, "skipping directory %s\n", fname);
1143                         continue;
1144                 }
1145
1146                 dir = NULL;
1147                 olddir[0] = '\0';
1148
1149                 if (!relative_paths) {
1150                         p = strrchr(fname, '/');
1151                         if (p) {
1152                                 *p = 0;
1153                                 if (p == fname)
1154                                         dir = "/";
1155                                 else
1156                                         dir = fname;
1157                                 fname = p + 1;
1158                         }
1159                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1160                         /* this ensures we send the intermediate directories,
1161                            thus getting their permissions right */
1162                         char *lp = lastpath, *fn = fname, *slash = fname;
1163                         *p = 0;
1164                         /* Skip any initial directories in our path that we
1165                          * have in common with lastpath. */
1166                         while (*fn && *lp == *fn) {
1167                                 if (*fn == '/')
1168                                         slash = fn;
1169                                 lp++, fn++;
1170                         }
1171                         *p = '/';
1172                         if (fn != p || (*lp && *lp != '/')) {
1173                                 int save_copy_links = copy_links;
1174                                 int save_xfer_dirs = xfer_dirs;
1175                                 copy_links = copy_unsafe_links;
1176                                 xfer_dirs = 1;
1177                                 while ((slash = strchr(slash+1, '/')) != 0) {
1178                                         *slash = 0;
1179                                         send_file_name(f, flist, fname, 0, 0);
1180                                         *slash = '/';
1181                                 }
1182                                 copy_links = save_copy_links;
1183                                 xfer_dirs = save_xfer_dirs;
1184                                 *p = 0;
1185                                 strlcpy(lastpath, fname, sizeof lastpath);
1186                                 *p = '/';
1187                         }
1188                 }
1189
1190                 if (!*fname)
1191                         fname = ".";
1192
1193                 if (dir && *dir) {
1194                         static char *lastdir;
1195                         static int lastdir_len;
1196
1197                         strcpy(olddir, curr_dir); /* can't overflow */
1198
1199                         if (!push_dir(dir)) {
1200                                 io_error |= IOERR_GENERAL;
1201                                 rsyserr(FERROR, errno, "push_dir %s failed",
1202                                         full_fname(dir));
1203                                 continue;
1204                         }
1205
1206                         if (lastdir && strcmp(lastdir, dir) == 0) {
1207                                 flist_dir = lastdir;
1208                                 flist_dir_len = lastdir_len;
1209                         } else {
1210                                 flist_dir = lastdir = strdup(dir);
1211                                 flist_dir_len = lastdir_len = strlen(dir);
1212                         }
1213                 }
1214
1215                 if (one_file_system)
1216                         filesystem_dev = st.st_dev;
1217
1218                 do_subdirs = recurse >= 1 ? recurse-- : recurse;
1219                 send_file_name(f, flist, fname, do_subdirs, XMIT_DEL_START);
1220
1221                 if (olddir[0]) {
1222                         flist_dir = NULL;
1223                         flist_dir_len = 0;
1224                         if (!pop_dir(olddir)) {
1225                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1226                                         full_fname(dir));
1227                                 exit_cleanup(RERR_FILESELECT);
1228                         }
1229                 }
1230         }
1231
1232         if (f != -1) {
1233                 gettimeofday(&end_tv, NULL);
1234                 stats.flist_buildtime =
1235                     (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1236                          + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1237                 if (stats.flist_buildtime == 0)
1238                         stats.flist_buildtime = 1;
1239                 start_tv = end_tv;
1240
1241                 send_file_entry(NULL, f, 0);
1242
1243                 if (show_filelist_p())
1244                         finish_filelist_progress(flist);
1245
1246                 gettimeofday(&end_tv, NULL);
1247                 stats.flist_xfertime =
1248                     (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1249                          + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1250         }
1251
1252         if (flist->hlink_pool) {
1253                 pool_destroy(flist->hlink_pool);
1254                 flist->hlink_pool = NULL;
1255         }
1256
1257         clean_flist(flist, 0, 0);
1258
1259         if (f != -1) {
1260                 /* Now send the uid/gid list. This was introduced in
1261                  * protocol version 15 */
1262                 send_uid_list(f);
1263
1264                 /* send the io_error flag */
1265                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1266
1267                 io_end_buffering();
1268                 stats.flist_size = stats.total_written - start_write;
1269                 stats.num_files = flist->count;
1270         }
1271
1272         if (verbose > 3)
1273                 output_flist(flist, f < 0 ? "delete" : who_am_i());
1274
1275         if (verbose > 2)
1276                 rprintf(FINFO, "send_file_list done\n");
1277
1278         return flist;
1279 }
1280
1281
1282 struct file_list *recv_file_list(int f)
1283 {
1284         struct file_list *flist;
1285         unsigned short flags;
1286         int64 start_read;
1287
1288         if (show_filelist_p())
1289                 start_filelist_progress("receiving file list");
1290
1291         start_read = stats.total_read;
1292
1293         flist = flist_new(WITH_HLINK, "recv_file_list");
1294         received_flist = flist;
1295
1296         flist->count = 0;
1297         flist->malloced = 1000;
1298         flist->files = new_array(struct file_struct *, flist->malloced);
1299         if (!flist->files)
1300                 goto oom;
1301
1302
1303         while ((flags = read_byte(f)) != 0) {
1304                 int i = flist->count;
1305
1306                 flist_expand(flist);
1307
1308                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1309                         flags |= read_byte(f) << 8;
1310                 receive_file_entry(flist, i, flags, f);
1311
1312                 if (S_ISREG(flist->files[i]->mode))
1313                         stats.total_size += flist->files[i]->length;
1314
1315                 flist->count++;
1316
1317                 maybe_emit_filelist_progress(flist);
1318
1319                 if (verbose > 2) {
1320                         rprintf(FINFO, "recv_file_name(%s)\n",
1321                                 f_name(flist->files[i]));
1322                 }
1323         }
1324         receive_file_entry(NULL, 0, 0, 0); /* Signal that we're done. */
1325
1326         if (verbose > 2)
1327                 rprintf(FINFO, "received %d names\n", flist->count);
1328
1329         if (show_filelist_p())
1330                 finish_filelist_progress(flist);
1331
1332         clean_flist(flist, relative_paths, 1);
1333
1334         if (f != -1) {
1335                 /* Now send the uid/gid list. This was introduced in
1336                  * protocol version 15 */
1337                 recv_uid_list(f, flist);
1338
1339                 /* Recv the io_error flag */
1340                 if (lp_ignore_errors(module_id) || ignore_errors)
1341                         read_int(f);
1342                 else
1343                         io_error |= read_int(f);
1344         }
1345
1346         if (verbose > 3)
1347                 output_flist(flist, who_am_i());
1348
1349         if (list_only) {
1350                 int i;
1351                 for (i = 0; i < flist->count; i++)
1352                         list_file_entry(flist->files[i]);
1353         }
1354
1355         if (verbose > 2)
1356                 rprintf(FINFO, "recv_file_list done\n");
1357
1358         stats.flist_size = stats.total_read - start_read;
1359         stats.num_files = flist->count;
1360
1361         return flist;
1362
1363 oom:
1364         out_of_memory("recv_file_list");
1365         return NULL;            /* not reached */
1366 }
1367
1368
1369 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1370 {
1371         return f_name_cmp(*file1, *file2);
1372 }
1373
1374
1375 static int flist_find(struct file_list *flist, struct file_struct *f)
1376 {
1377         int low = flist->low, high = flist->high;
1378         int ret, mid, mid_up;
1379
1380         while (low <= high) {
1381                 mid = (low + high) / 2;
1382                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1383                 if (mid_up <= high)
1384                         ret = f_name_cmp(flist->files[mid_up], f);
1385                 else
1386                         ret = 1;
1387                 if (ret == 0)
1388                         return mid_up;
1389                 if (ret > 0)
1390                         high = mid - 1;
1391                 else
1392                         low = mid_up + 1;
1393         }
1394         return -1;
1395 }
1396
1397 /*
1398  * Free up any resources a file_struct has allocated
1399  * and clear the file.
1400  */
1401 void clear_file(int i, struct file_list *flist)
1402 {
1403         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1404                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1405         memset(flist->files[i], 0, file_struct_len);
1406 }
1407
1408
1409 /*
1410  * allocate a new file list
1411  */
1412 struct file_list *flist_new(int with_hlink, char *msg)
1413 {
1414         struct file_list *flist;
1415
1416         flist = new(struct file_list);
1417         if (!flist)
1418                 out_of_memory(msg);
1419
1420         memset(flist, 0, sizeof (struct file_list));
1421
1422         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1423             out_of_memory, POOL_INTERN)))
1424                 out_of_memory(msg);
1425
1426 #if SUPPORT_HARD_LINKS
1427         if (with_hlink && preserve_hard_links) {
1428                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1429                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1430                         out_of_memory(msg);
1431         }
1432 #endif
1433
1434         return flist;
1435 }
1436
1437 /*
1438  * free up all elements in a flist
1439  */
1440 void flist_free(struct file_list *flist)
1441 {
1442         pool_destroy(flist->file_pool);
1443         pool_destroy(flist->hlink_pool);
1444         free(flist->files);
1445         free(flist);
1446 }
1447
1448
1449 /*
1450  * This routine ensures we don't have any duplicate names in our file list.
1451  * duplicate names can cause corruption because of the pipelining
1452  */
1453 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1454 {
1455         int i, prev_i = 0;
1456
1457         if (!flist || flist->count == 0)
1458                 return;
1459
1460         qsort(flist->files, flist->count,
1461             sizeof flist->files[0], (int (*)())file_compare);
1462
1463         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1464                 if (flist->files[i]->basename) {
1465                         prev_i = i;
1466                         break;
1467                 }
1468         }
1469         flist->low = prev_i;
1470         while (++i < flist->count) {
1471                 if (!flist->files[i]->basename)
1472                         continue;
1473                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1474                         if (verbose > 1 && !am_server) {
1475                                 rprintf(FINFO,
1476                                         "removing duplicate name %s from file list %d\n",
1477                                         f_name(flist->files[i]), i);
1478                         }
1479                         /* Make sure that if we unduplicate '.', that we don't
1480                          * lose track of a user-specified starting point (or
1481                          * else deletions will mysteriously fail with -R). */
1482                         if (flist->files[i]->flags & FLAG_DEL_START)
1483                                 flist->files[prev_i]->flags |= FLAG_DEL_START;
1484
1485                         clear_file(i, flist);
1486                 } else
1487                         prev_i = i;
1488         }
1489         flist->high = prev_i;
1490
1491         if (strip_root) {
1492                 /* we need to strip off the root directory in the case
1493                    of relative paths, but this must be done _after_
1494                    the sorting phase */
1495                 for (i = 0; i < flist->count; i++) {
1496                         if (flist->files[i]->dirname &&
1497                             flist->files[i]->dirname[0] == '/') {
1498                                 memmove(&flist->files[i]->dirname[0],
1499                                         &flist->files[i]->dirname[1],
1500                                         strlen(flist->files[i]->dirname));
1501                         }
1502
1503                         if (flist->files[i]->dirname &&
1504                             !flist->files[i]->dirname[0]) {
1505                                 flist->files[i]->dirname = NULL;
1506                         }
1507                 }
1508         }
1509 }
1510
1511 static void output_flist(struct file_list *flist, const char *whose_list)
1512 {
1513         char uidbuf[16], gidbuf[16], depthbuf[16];
1514         struct file_struct *file;
1515         int i;
1516
1517         for (i = 0; i < flist->count; i++) {
1518                 file = flist->files[i];
1519                 if ((am_root || am_sender) && preserve_uid)
1520                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1521                 else
1522                         *uidbuf = '\0';
1523                 if (preserve_gid && file->gid != GID_NONE)
1524                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1525                 else
1526                         *gidbuf = '\0';
1527                 if (!am_sender)
1528                         sprintf(depthbuf, "%d", file->dir.depth);
1529                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1530                         whose_list, i, am_sender ? NS(file->dir.root) : depthbuf,
1531                         file->dirname ? file->dirname : "",
1532                         file->dirname ? "/" : "", NS(file->basename),
1533                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1534                         (double)file->length, uidbuf, gidbuf, file->flags);
1535         }
1536 }
1537
1538
1539 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1540
1541 /* Compare the names of two file_struct entities, just like strcmp()
1542  * would do if it were operating on the joined strings.  We assume
1543  * that there are no 0-length strings.
1544  */
1545 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1546 {
1547         int dif;
1548         const uchar *c1, *c2;
1549         enum fnc_state state1, state2;
1550
1551         if (!f1 || !f1->basename) {
1552                 if (!f2 || !f2->basename)
1553                         return 0;
1554                 return -1;
1555         }
1556         if (!f2 || !f2->basename)
1557                 return 1;
1558
1559         c1 = (uchar*)f1->dirname;
1560         c2 = (uchar*)f2->dirname;
1561         if (c1 == c2)
1562                 c1 = c2 = NULL;
1563         if (!c1) {
1564                 state1 = fnc_BASE;
1565                 c1 = (uchar*)f1->basename;
1566         } else if (!*c1) {
1567                 state1 = fnc_SLASH;
1568                 c1 = (uchar*)"/";
1569         } else
1570                 state1 = fnc_DIR;
1571         if (!c2) {
1572                 state2 = fnc_BASE;
1573                 c2 = (uchar*)f2->basename;
1574         } else if (!*c2) {
1575                 state2 = fnc_SLASH;
1576                 c2 = (uchar*)"/";
1577         } else
1578                 state2 = fnc_DIR;
1579
1580         while (1) {
1581                 if ((dif = (int)*c1 - (int)*c2) != 0)
1582                         break;
1583                 if (!*++c1) {
1584                         switch (state1) {
1585                         case fnc_DIR:
1586                                 state1 = fnc_SLASH;
1587                                 c1 = (uchar*)"/";
1588                                 break;
1589                         case fnc_SLASH:
1590                                 state1 = fnc_BASE;
1591                                 c1 = (uchar*)f1->basename;
1592                                 break;
1593                         case fnc_BASE:
1594                                 break;
1595                         }
1596                 }
1597                 if (!*++c2) {
1598                         switch (state2) {
1599                         case fnc_DIR:
1600                                 state2 = fnc_SLASH;
1601                                 c2 = (uchar*)"/";
1602                                 break;
1603                         case fnc_SLASH:
1604                                 state2 = fnc_BASE;
1605                                 c2 = (uchar*)f2->basename;
1606                                 break;
1607                         case fnc_BASE:
1608                                 if (!*c1)
1609                                         return 0;
1610                                 break;
1611                         }
1612                 }
1613         }
1614
1615         return dif;
1616 }
1617
1618
1619 /* Return a copy of the full filename of a flist entry, using the indicated
1620  * buffer.  No size-checking is done because we checked the size when creating
1621  * the file_struct entry.
1622  */
1623 char *f_name_to(struct file_struct *f, char *fbuf)
1624 {
1625         if (!f || !f->basename)
1626                 return NULL;
1627
1628         if (f->dirname) {
1629                 int len = strlen(f->dirname);
1630                 memcpy(fbuf, f->dirname, len);
1631                 fbuf[len] = '/';
1632                 strcpy(fbuf + len + 1, f->basename);
1633         } else
1634                 strcpy(fbuf, f->basename);
1635         return fbuf;
1636 }
1637
1638
1639 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1640 char *f_name(struct file_struct *f)
1641 {
1642         static char names[5][MAXPATHLEN];
1643         static unsigned int n;
1644
1645         n = (n + 1) % (sizeof names / sizeof names[0]);
1646
1647         return f_name_to(f, names[n]);
1648 }
1649
1650
1651 static int is_backup_file(char *fn)
1652 {
1653         int k = strlen(fn) - backup_suffix_len;
1654         return k > 0 && strcmp(fn+k, backup_suffix) == 0;
1655 }
1656
1657
1658 /* This function is used to implement --delete-during. */
1659 void delete_in_dir(struct file_list *flist, char *fbuf, int dlen, int new_depth)
1660 {
1661         static int min_depth = MAXPATHLEN, cur_depth = -1;
1662         static void *filt_array[MAXPATHLEN/2+1];
1663         struct file_list *dir_list;
1664         STRUCT_STAT st;
1665
1666         if (!flist) {
1667                 while (cur_depth >= min_depth)
1668                         pop_local_filters(filt_array[cur_depth--]);
1669                 min_depth = MAXPATHLEN;
1670                 cur_depth = -1;
1671                 return;
1672         }
1673         if (new_depth >= MAXPATHLEN/2+1)
1674                 return; /* Impossible... */
1675
1676         if (max_delete && deletion_count >= max_delete)
1677                 return;
1678
1679         if (io_error && !(lp_ignore_errors(module_id) || ignore_errors)) {
1680                 rprintf(FINFO,
1681                         "IO error encountered -- skipping file deletion\n");
1682                 max_delete = -1; /* avoid duplicating the above warning */
1683                 return;
1684         }
1685
1686         while (cur_depth >= new_depth && cur_depth >= min_depth)
1687                 pop_local_filters(filt_array[cur_depth--]);
1688         cur_depth = new_depth;
1689         if (min_depth > cur_depth)
1690                 min_depth = cur_depth;
1691         filt_array[cur_depth] = push_local_filters(fbuf, dlen);
1692
1693         if (link_stat(fbuf, &st, keep_dirlinks) < 0)
1694                 return;
1695
1696         if (one_file_system)
1697                 filesystem_dev = st.st_dev;
1698
1699         dir_list = flist_new(WITHOUT_HLINK, "delete_in_dir");
1700
1701         recurse = 0;
1702         send_directory(-1, dir_list, fbuf, dlen);
1703         recurse = -1;
1704         fbuf[dlen] = '\0';
1705
1706         if (verbose > 3)
1707                 output_flist(dir_list, "delete");
1708
1709         delete_missing(flist, dir_list, fbuf);
1710
1711         flist_free(dir_list);
1712 }
1713
1714
1715 /* If an item in dir_list is not found in full_list, delete it from the
1716  * filesystem. */
1717 void delete_missing(struct file_list *full_list, struct file_list *dir_list,
1718                     const char *dirname)
1719 {
1720         int i, j, mode;
1721
1722         if (max_delete && deletion_count >= max_delete)
1723                 return;
1724
1725         if (verbose > 2)
1726                 rprintf(FINFO, "delete_missing(%s)\n", safe_fname(dirname));
1727
1728         for (i = dir_list->count; i--; ) {
1729                 if (!dir_list->files[i]->basename)
1730                         continue;
1731                 mode = dir_list->files[i]->mode;
1732                 if ((j = flist_find(full_list, dir_list->files[i])) < 0
1733                     || (delete_during && S_ISDIR(mode)
1734                      && !S_ISDIR(full_list->files[j]->mode))) {
1735                         char *f = f_name(dir_list->files[i]);
1736                         if (make_backups && (backup_dir || !is_backup_file(f))
1737                           && !S_ISDIR(mode)) {
1738                                 make_backup(f);
1739                                 if (verbose) {
1740                                         rprintf(FINFO, "deleting %s\n",
1741                                                 safe_fname(f));
1742                                 }
1743                         } else if (S_ISDIR(mode)) {
1744                                 int dflag = delete_during ? DEL_FORCE_RECURSE
1745                                                           : DEL_NO_RECURSE;
1746                                 delete_file(f, DEL_DIR | dflag);
1747                         } else {
1748                                 delete_file(f, 0);
1749                         }
1750                         deletion_count++;
1751                         if (max_delete && deletion_count >= max_delete)
1752                                 break;
1753                 }
1754         }
1755 }