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 always_checksum;
  38 extern int module_id;
  39 extern int ignore_errors;
  40 extern int numeric_ids;
  41
  42 extern int cvs_exclude;
  43
  44 extern int recurse;
  45 extern char curr_dir[MAXPATHLEN];
  46 extern char *files_from;
  47 extern int filesfrom_fd;
  48
  49 extern int one_file_system;
  50 extern int keep_dirlinks;
  51 extern int preserve_links;
  52 extern int preserve_hard_links;
  53 extern int preserve_perms;
  54 extern int preserve_devices;
  55 extern int preserve_uid;
  56 extern int preserve_gid;
  57 extern int relative_paths;
  58 extern int implied_dirs;
  59 extern int copy_links;
  60 extern int copy_unsafe_links;
  61 extern int protocol_version;
  62 extern int sanitize_paths;
  63 extern int delete_excluded;
  64 extern int orig_umask;
  65 extern int list_only;
  66
  67 extern int read_batch;
  68 extern int write_batch;
  69
  70 extern struct exclude_list_struct exclude_list;
  71 extern struct exclude_list_struct server_exclude_list;
  72 extern struct exclude_list_struct local_exclude_list;
  73
  74 int io_error;
  75
  76 static char empty_sum[MD4_SUM_LENGTH];
  77 static unsigned int file_struct_len;
  78
  79 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  80 static void output_flist(struct file_list *flist);
  81
  82 void init_flist(void)
  83 {
  84         struct file_struct f;
  85
  86         /* Figure out how big the file_struct is without trailing padding */
  87         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  88 }
  89
  90
  91 static int show_filelist_p(void)
  92 {
  93         return verbose && (recurse || files_from) && !am_server;
  94 }
  95
  96 static void start_filelist_progress(char *kind)
  97 {
  98         rprintf(FINFO, "%s ... ", kind);
  99         if (verbose > 1 || do_progress)
 100                 rprintf(FINFO, "\n");
 101         rflush(FINFO);
 102 }
 103
 104
 105 static void emit_filelist_progress(const struct file_list *flist)
 106 {
 107         rprintf(FINFO, " %d files...\r", flist->count);
 108 }
 109
 110
 111 static void maybe_emit_filelist_progress(const struct file_list *flist)
 112 {
 113         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
 114                 emit_filelist_progress(flist);
 115 }
 116
 117
 118 static void finish_filelist_progress(const struct file_list *flist)
 119 {
 120         if (do_progress) {
 121                 /* This overwrites the progress line */
 122                 rprintf(FINFO, "%d file%sto consider\n",
 123                         flist->count, flist->count == 1 ? " " : "s ");
 124         } else
 125                 rprintf(FINFO, "done\n");
 126 }
 127
 128 void show_flist_stats(void)
 129 {
 130         /* Nothing yet */
 131 }
 132
 133
 134 static void list_file_entry(struct file_struct *f)
 135 {
 136         char perms[11];
 137
 138         if (!f->basename) {
 139                 /* this can happen if duplicate names were removed */
 140                 return;
 141         }
 142
 143         permstring(perms, f->mode);
 144
 145 #if SUPPORT_LINKS
 146         if (preserve_links && S_ISLNK(f->mode)) {
 147                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 148                         perms,
 149                         (double)f->length, timestring(f->modtime),
 150                         f_name(f), f->u.link);
 151         } else
 152 #endif
 153         {
 154                 rprintf(FINFO, "%s %11.0f %s %s\n",
 155                         perms,
 156                         (double)f->length, timestring(f->modtime),
 157                         f_name(f));
 158         }
 159 }
 160
 161
 162 /**
 163  * Stat either a symlink or its referent, depending on the settings of
 164  * copy_links, copy_unsafe_links, etc.
 165  *
 166  * @retval -1 on error
 167  *
 168  * @retval 0 for success
 169  *
 170  * @post If @p path is a symlink, then @p linkbuf (of size @c
 171  * MAXPATHLEN) contains the symlink target.
 172  *
 173  * @post @p buffer contains information about the link or the
 174  * referrent as appropriate, if they exist.
 175  **/
 176 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 177 {
 178 #if SUPPORT_LINKS
 179         if (copy_links)
 180                 return do_stat(path, buffer);
 181         if (link_stat(path, buffer, keep_dirlinks) < 0)
 182                 return -1;
 183         if (S_ISLNK(buffer->st_mode)) {
 184                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 185                 if (l == -1)
 186                         return -1;
 187                 linkbuf[l] = 0;
 188                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 189                         if (verbose > 1) {
 190                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 191                                         path, linkbuf);
 192                         }
 193                         return do_stat(path, buffer);
 194                 }
 195         }
 196         return 0;
 197 #else
 198         return do_stat(path, buffer);
 199 #endif
 200 }
 201
 202 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 203 {
 204 #if SUPPORT_LINKS
 205         if (copy_links)
 206                 return do_stat(path, buffer);
 207         if (do_lstat(path, buffer) < 0)
 208                 return -1;
 209         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 210                 STRUCT_STAT st;
 211                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 212                         *buffer = st;
 213         }
 214         return 0;
 215 #else
 216         return do_stat(path, buffer);
 217 #endif
 218 }
 219
 220 /*
 221  * This function is used to check if a file should be included/excluded
 222  * from the list of files based on its name and type etc.  The value of
 223  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 224  */
 225 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 226 {
 227         int rc;
 228
 229 #if 0 /* This currently never happens, so avoid a useless compare. */
 230         if (exclude_level == NO_EXCLUDES)
 231                 return 0;
 232 #endif
 233         if (fname) {
 234                 /* never exclude '.', even if somebody does --exclude '*' */
 235                 if (fname[0] == '.' && !fname[1])
 236                         return 0;
 237                 /* Handle the -R version of the '.' dir. */
 238                 if (fname[0] == '/') {
 239                         int len = strlen(fname);
 240                         if (fname[len-1] == '.' && fname[len-2] == '/')
 241                                 return 0;
 242                 }
 243         }
 244         if (server_exclude_list.head
 245             && check_exclude(&server_exclude_list, fname, is_dir) < 0)
 246                 return 1;
 247         if (exclude_level != ALL_EXCLUDES)
 248                 return 0;
 249         if (exclude_list.head
 250             && (rc = check_exclude(&exclude_list, fname, is_dir)) != 0)
 251                 return rc < 0;
 252         if (local_exclude_list.head
 253             && check_exclude(&local_exclude_list, fname, is_dir) < 0)
 254                 return 1;
 255         return 0;
 256 }
 257
 258 /* used by the one_file_system code */
 259 static dev_t filesystem_dev;
 260
 261 static void set_filesystem(char *fname)
 262 {
 263         STRUCT_STAT st;
 264         if (do_stat(fname, &st) != 0)
 265                 return;
 266         filesystem_dev = st.st_dev;
 267 }
 268
 269
 270 static int to_wire_mode(mode_t mode)
 271 {
 272 #if SUPPORT_LINKS
 273         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 274                 return (mode & ~(_S_IFMT)) | 0120000;
 275 #endif
 276         return (int)mode;
 277 }
 278
 279 static mode_t from_wire_mode(int mode)
 280 {
 281         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 282                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 283         return (mode_t)mode;
 284 }
 285
 286
 287 static void send_directory(int f, struct file_list *flist, char *dir);
 288
 289 static char *flist_dir;
 290 static int flist_dir_len;
 291
 292
 293 /**
 294  * Make sure @p flist is big enough to hold at least @p flist->count
 295  * entries.
 296  **/
 297 void flist_expand(struct file_list *flist)
 298 {
 299         struct file_struct **new_ptr;
 300
 301         if (flist->count < flist->malloced)
 302                 return;
 303
 304         if (flist->malloced < FLIST_START)
 305                 flist->malloced = FLIST_START;
 306         else if (flist->malloced >= FLIST_LINEAR)
 307                 flist->malloced += FLIST_LINEAR;
 308         else
 309                 flist->malloced *= 2;
 310
 311         /*
 312          * In case count jumped or we are starting the list
 313          * with a known size just set it.
 314          */
 315         if (flist->malloced < flist->count)
 316                 flist->malloced = flist->count;
 317
 318         new_ptr = realloc_array(flist->files, struct file_struct *,
 319                                 flist->malloced);
 320
 321         if (verbose >= 2) {
 322                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 323                     who_am_i(),
 324                     (double)sizeof flist->files[0] * flist->malloced,
 325                     (new_ptr == flist->files) ? " not" : "");
 326         }
 327
 328         flist->files = new_ptr;
 329
 330         if (!flist->files)
 331                 out_of_memory("flist_expand");
 332 }
 333
 334 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 335 {
 336         unsigned short flags;
 337         static time_t modtime;
 338         static mode_t mode;
 339         static uint64 dev;
 340         static dev_t rdev;
 341         static uint32 rdev_major;
 342         static uid_t uid;
 343         static gid_t gid;
 344         static char lastname[MAXPATHLEN];
 345         char fname[MAXPATHLEN];
 346         int l1, l2;
 347
 348         if (f == -1)
 349                 return;
 350
 351         if (!file) {
 352                 write_byte(f, 0);
 353                 modtime = 0, mode = 0;
 354                 dev = 0, rdev = makedev(0, 0);
 355                 rdev_major = 0;
 356                 uid = 0, gid = 0;
 357                 *lastname = '\0';
 358                 return;
 359         }
 360
 361         io_write_phase = "send_file_entry";
 362
 363         f_name_to(file, fname);
 364
 365         flags = base_flags;
 366
 367         if (file->mode == mode)
 368                 flags |= XMIT_SAME_MODE;
 369         else
 370                 mode = file->mode;
 371         if (preserve_devices) {
 372                 if (protocol_version < 28) {
 373                         if (IS_DEVICE(mode)) {
 374                                 if (file->u.rdev == rdev)
 375                                         flags |= XMIT_SAME_RDEV_pre28;
 376                                 else
 377                                         rdev = file->u.rdev;
 378                         } else
 379                                 rdev = makedev(0, 0);
 380                 } else if (IS_DEVICE(mode)) {
 381                         rdev = file->u.rdev;
 382                         if ((uint32)major(rdev) == rdev_major)
 383                                 flags |= XMIT_SAME_RDEV_MAJOR;
 384                         else
 385                                 rdev_major = major(rdev);
 386                         if ((uint32)minor(rdev) <= 0xFFu)
 387                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 388                 }
 389         }
 390         if (file->uid == uid)
 391                 flags |= XMIT_SAME_UID;
 392         else
 393                 uid = file->uid;
 394         if (file->gid == gid)
 395                 flags |= XMIT_SAME_GID;
 396         else
 397                 gid = file->gid;
 398         if (file->modtime == modtime)
 399                 flags |= XMIT_SAME_TIME;
 400         else
 401                 modtime = file->modtime;
 402
 403 #if SUPPORT_HARD_LINKS
 404         if (file->link_u.idev) {
 405                 if (file->F_DEV == dev) {
 406                         if (protocol_version >= 28)
 407                                 flags |= XMIT_SAME_DEV;
 408                 } else
 409                         dev = file->F_DEV;
 410                 flags |= XMIT_HAS_IDEV_DATA;
 411         }
 412 #endif
 413
 414         for (l1 = 0;
 415             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 416             l1++) {}
 417         l2 = strlen(fname+l1);
 418
 419         if (l1 > 0)
 420                 flags |= XMIT_SAME_NAME;
 421         if (l2 > 255)
 422                 flags |= XMIT_LONG_NAME;
 423
 424         /* We must make sure we don't send a zero flag byte or the
 425          * other end will terminate the flist transfer.  Note that
 426          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 427          * it's harmless way to add a bit to the first flag byte. */
 428         if (protocol_version >= 28) {
 429                 if (!flags && !S_ISDIR(mode))
 430                         flags |= XMIT_TOP_DIR;
 431                 if ((flags & 0xFF00) || !flags) {
 432                         flags |= XMIT_EXTENDED_FLAGS;
 433                         write_byte(f, flags);
 434                         write_byte(f, flags >> 8);
 435                 } else
 436                         write_byte(f, flags);
 437         } else {
 438                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 439                         flags |= XMIT_TOP_DIR;
 440                 if (!(flags & 0xFF))
 441                         flags |= XMIT_LONG_NAME;
 442                 write_byte(f, flags);
 443         }
 444         if (flags & XMIT_SAME_NAME)
 445                 write_byte(f, l1);
 446         if (flags & XMIT_LONG_NAME)
 447                 write_int(f, l2);
 448         else
 449                 write_byte(f, l2);
 450         write_buf(f, fname + l1, l2);
 451
 452         write_longint(f, file->length);
 453         if (!(flags & XMIT_SAME_TIME))
 454                 write_int(f, modtime);
 455         if (!(flags & XMIT_SAME_MODE))
 456                 write_int(f, to_wire_mode(mode));
 457         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 458                 if (!numeric_ids)
 459                         add_uid(uid);
 460                 write_int(f, uid);
 461         }
 462         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 463                 if (!numeric_ids)
 464                         add_gid(gid);
 465                 write_int(f, gid);
 466         }
 467         if (preserve_devices && IS_DEVICE(mode)) {
 468                 if (protocol_version < 28) {
 469                         if (!(flags & XMIT_SAME_RDEV_pre28))
 470                                 write_int(f, (int)rdev);
 471                 } else {
 472                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 473                                 write_int(f, major(rdev));
 474                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 475                                 write_byte(f, minor(rdev));
 476                         else
 477                                 write_int(f, minor(rdev));
 478                 }
 479         }
 480
 481 #if SUPPORT_LINKS
 482         if (preserve_links && S_ISLNK(mode)) {
 483                 int len = strlen(file->u.link);
 484                 write_int(f, len);
 485                 write_buf(f, file->u.link, len);
 486         }
 487 #endif
 488
 489 #if SUPPORT_HARD_LINKS
 490         if (flags & XMIT_HAS_IDEV_DATA) {
 491                 if (protocol_version < 26) {
 492                         /* 32-bit dev_t and ino_t */
 493                         write_int(f, dev);
 494                         write_int(f, file->F_INODE);
 495                 } else {
 496                         /* 64-bit dev_t and ino_t */
 497                         if (!(flags & XMIT_SAME_DEV))
 498                                 write_longint(f, dev);
 499                         write_longint(f, file->F_INODE);
 500                 }
 501         }
 502 #endif
 503
 504         if (always_checksum) {
 505                 char *sum;
 506                 if (S_ISREG(mode))
 507                         sum = file->u.sum;
 508                 else if (protocol_version < 28) {
 509                         /* Prior to 28, we sent a useless set of nulls. */
 510                         sum = empty_sum;
 511                 } else
 512                         sum = NULL;
 513                 if (sum) {
 514                         write_buf(f, sum,
 515                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 516                 }
 517         }
 518
 519         strlcpy(lastname, fname, MAXPATHLEN);
 520
 521         io_write_phase = "unknown";
 522 }
 523
 524
 525
 526 void receive_file_entry(struct file_struct **fptr, unsigned short flags,
 527                         struct file_list *flist, int f)
 528 {
 529         static time_t modtime;
 530         static mode_t mode;
 531         static uint64 dev;
 532         static dev_t rdev;
 533         static uint32 rdev_major;
 534         static uid_t uid;
 535         static gid_t gid;
 536         static char lastname[MAXPATHLEN], *lastdir;
 537         static int lastdir_len = -1;
 538         char thisname[MAXPATHLEN];
 539         unsigned int l1 = 0, l2 = 0;
 540         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 541         OFF_T file_length;
 542         char *basename, *dirname, *bp;
 543         struct file_struct *file;
 544
 545         if (!fptr) {
 546                 modtime = 0, mode = 0;
 547                 dev = 0, rdev = makedev(0, 0);
 548                 rdev_major = 0;
 549                 uid = 0, gid = 0;
 550                 *lastname = '\0';
 551                 lastdir_len = -1;
 552                 return;
 553         }
 554
 555         if (flags & XMIT_SAME_NAME)
 556                 l1 = read_byte(f);
 557
 558         if (flags & XMIT_LONG_NAME)
 559                 l2 = read_int(f);
 560         else
 561                 l2 = read_byte(f);
 562
 563         if (l2 >= MAXPATHLEN - l1) {
 564                 rprintf(FERROR,
 565                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 566                         flags, l1, l2, lastname);
 567                 overflow("receive_file_entry");
 568         }
 569
 570         strlcpy(thisname, lastname, l1 + 1);
 571         read_sbuf(f, &thisname[l1], l2);
 572         thisname[l1 + l2] = 0;
 573
 574         strlcpy(lastname, thisname, MAXPATHLEN);
 575
 576         clean_fname(thisname);
 577
 578         if (sanitize_paths)
 579                 sanitize_path(thisname, NULL);
 580
 581         if ((basename = strrchr(thisname, '/')) != NULL) {
 582                 dirname_len = ++basename - thisname; /* counts future '\0' */
 583                 if (lastdir_len == dirname_len - 1
 584                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 585                         dirname = lastdir;
 586                         dirname_len = 0; /* indicates no copy is needed */
 587                 } else
 588                         dirname = thisname;
 589         } else {
 590                 basename = thisname;
 591                 dirname = NULL;
 592                 dirname_len = 0;
 593         }
 594         basename_len = strlen(basename) + 1; /* count the '\0' */
 595
 596         file_length = read_longint(f);
 597         if (!(flags & XMIT_SAME_TIME))
 598                 modtime = (time_t)read_int(f);
 599         if (!(flags & XMIT_SAME_MODE))
 600                 mode = from_wire_mode(read_int(f));
 601
 602         if (preserve_uid && !(flags & XMIT_SAME_UID))
 603                 uid = (uid_t)read_int(f);
 604         if (preserve_gid && !(flags & XMIT_SAME_GID))
 605                 gid = (gid_t)read_int(f);
 606
 607         if (preserve_devices) {
 608                 if (protocol_version < 28) {
 609                         if (IS_DEVICE(mode)) {
 610                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 611                                         rdev = (dev_t)read_int(f);
 612                         } else
 613                                 rdev = makedev(0, 0);
 614                 } else if (IS_DEVICE(mode)) {
 615                         uint32 rdev_minor;
 616                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 617                                 rdev_major = read_int(f);
 618                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 619                                 rdev_minor = read_byte(f);
 620                         else
 621                                 rdev_minor = read_int(f);
 622                         rdev = makedev(rdev_major, rdev_minor);
 623                 }
 624         }
 625
 626 #if SUPPORT_LINKS
 627         if (preserve_links && S_ISLNK(mode)) {
 628                 linkname_len = read_int(f) + 1; /* count the '\0' */
 629                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 630                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 631                                 linkname_len - 1);
 632                         overflow("receive_file_entry");
 633                 }
 634         }
 635         else
 636 #endif
 637                 linkname_len = 0;
 638
 639         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 640
 641         alloc_len = file_struct_len + dirname_len + basename_len
 642                   + linkname_len + sum_len;
 643         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 644
 645         file = *fptr = (struct file_struct *)bp;
 646         memset(bp, 0, file_struct_len);
 647         bp += file_struct_len;
 648
 649         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
 650         file->modtime = modtime;
 651         file->length = file_length;
 652         file->mode = mode;
 653         file->uid = uid;
 654         file->gid = gid;
 655
 656         if (dirname_len) {
 657                 file->dirname = lastdir = bp;
 658                 lastdir_len = dirname_len - 1;
 659                 memcpy(bp, dirname, dirname_len - 1);
 660                 bp += dirname_len;
 661                 bp[-1] = '\0';
 662         } else if (dirname)
 663                 file->dirname = dirname;
 664
 665         file->basename = bp;
 666         memcpy(bp, basename, basename_len);
 667         bp += basename_len;
 668
 669         if (preserve_devices && IS_DEVICE(mode))
 670                 file->u.rdev = rdev;
 671
 672 #if SUPPORT_LINKS
 673         if (linkname_len) {
 674                 file->u.link = bp;
 675                 read_sbuf(f, bp, linkname_len - 1);
 676                 if (sanitize_paths)
 677                         sanitize_path(bp, lastdir);
 678                 bp += linkname_len;
 679         }
 680 #endif
 681
 682 #if SUPPORT_HARD_LINKS
 683         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 684                 flags |= XMIT_HAS_IDEV_DATA;
 685         if (flags & XMIT_HAS_IDEV_DATA) {
 686                 uint64 inode;
 687                 if (protocol_version < 26) {
 688                         dev = read_int(f);
 689                         inode = read_int(f);
 690                 } else {
 691                         if (!(flags & XMIT_SAME_DEV))
 692                                 dev = read_longint(f);
 693                         inode = read_longint(f);
 694                 }
 695                 if (flist->hlink_pool) {
 696                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 697                             struct idev, 1, "inode_table");
 698                         file->F_INODE = inode;
 699                         file->F_DEV = dev;
 700                 }
 701         }
 702 #endif
 703
 704         if (always_checksum) {
 705                 char *sum;
 706                 if (sum_len) {
 707                         file->u.sum = sum = bp;
 708                         /*bp += sum_len;*/
 709                 } else if (protocol_version < 28) {
 710                         /* Prior to 28, we get a useless set of nulls. */
 711                         sum = empty_sum;
 712                 } else
 713                         sum = NULL;
 714                 if (sum) {
 715                         read_buf(f, sum,
 716                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 717                 }
 718         }
 719
 720         if (!preserve_perms) {
 721                 /* set an appropriate set of permissions based on original
 722                  * permissions and umask. This emulates what GNU cp does */
 723                 file->mode &= ~orig_umask;
 724         }
 725 }
 726
 727
 728 /**
 729  * Create a file_struct for a named file by reading its stat()
 730  * information and performing extensive checks against global
 731  * options.
 732  *
 733  * @return the new file, or NULL if there was an error or this file
 734  * should be excluded.
 735  *
 736  * @todo There is a small optimization opportunity here to avoid
 737  * stat()ing the file in some circumstances, which has a certain cost.
 738  * We are called immediately after doing readdir(), and so we may
 739  * already know the d_type of the file.  We could for example avoid
 740  * statting directories if we're not recursing, but this is not a very
 741  * important case.  Some systems may not have d_type.
 742  **/
 743 struct file_struct *make_file(char *fname, struct file_list *flist,
 744                               int exclude_level)
 745 {
 746         static char *lastdir;
 747         static int lastdir_len = -1;
 748         struct file_struct *file;
 749         STRUCT_STAT st;
 750         char sum[SUM_LENGTH];
 751         char thisname[MAXPATHLEN];
 752         char linkname[MAXPATHLEN];
 753         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 754         char *basename, *dirname, *bp;
 755         unsigned short flags = 0;
 756
 757         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 758                 lastdir_len = -1;
 759
 760         if (strlcpy(thisname, fname, sizeof thisname)
 761             >= sizeof thisname - flist_dir_len) {
 762                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 763                 return NULL;
 764         }
 765         clean_fname(thisname);
 766         if (sanitize_paths)
 767                 sanitize_path(thisname, NULL);
 768
 769         memset(sum, 0, SUM_LENGTH);
 770
 771         if (readlink_stat(thisname, &st, linkname) != 0) {
 772                 int save_errno = errno;
 773                 /* See if file is excluded before reporting an error. */
 774                 if (exclude_level != NO_EXCLUDES
 775                     && check_exclude_file(thisname, 0, exclude_level))
 776                         return NULL;
 777                 if (save_errno == ENOENT) {
 778 #if SUPPORT_LINKS
 779                         /* Avoid "vanished" error if symlink points nowhere. */
 780                         if (copy_links && do_lstat(thisname, &st) == 0
 781                             && S_ISLNK(st.st_mode)) {
 782                                 io_error |= IOERR_GENERAL;
 783                                 rprintf(FERROR, "symlink has no referent: %s\n",
 784                                         full_fname(thisname));
 785                         } else
 786 #endif
 787                         {
 788                                 enum logcode c = am_daemon && protocol_version < 28
 789                                     ? FERROR : FINFO;
 790                                 io_error |= IOERR_VANISHED;
 791                                 rprintf(c, "file has vanished: %s\n",
 792                                         full_fname(thisname));
 793                         }
 794                 } else {
 795                         io_error |= IOERR_GENERAL;
 796                         rsyserr(FERROR, save_errno, "readlink %s failed",
 797                                 full_fname(thisname));
 798                 }
 799                 return NULL;
 800         }
 801
 802         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 803         if (exclude_level == NO_EXCLUDES)
 804                 goto skip_excludes;
 805
 806         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 807                 rprintf(FINFO, "skipping directory %s\n", thisname);
 808                 return NULL;
 809         }
 810
 811         /* We only care about directories because we need to avoid recursing
 812          * into a mount-point directory, not to avoid copying a symlinked
 813          * file if -L (or similar) was specified. */
 814         if (one_file_system && st.st_dev != filesystem_dev
 815             && S_ISDIR(st.st_mode))
 816                 flags |= FLAG_MOUNT_POINT;
 817
 818         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
 819                 return NULL;
 820
 821         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
 822                 return NULL;
 823
 824 skip_excludes:
 825
 826         if (verbose > 2) {
 827                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 828                         who_am_i(), thisname, exclude_level);
 829         }
 830
 831         if ((basename = strrchr(thisname, '/')) != NULL) {
 832                 dirname_len = ++basename - thisname; /* counts future '\0' */
 833                 if (lastdir_len == dirname_len - 1
 834                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 835                         dirname = lastdir;
 836                         dirname_len = 0; /* indicates no copy is needed */
 837                 } else
 838                         dirname = thisname;
 839         } else {
 840                 basename = thisname;
 841                 dirname = NULL;
 842                 dirname_len = 0;
 843         }
 844         basename_len = strlen(basename) + 1; /* count the '\0' */
 845
 846 #if SUPPORT_LINKS
 847         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 848 #else
 849         linkname_len = 0;
 850 #endif
 851
 852         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 853
 854         alloc_len = file_struct_len + dirname_len + basename_len
 855             + linkname_len + sum_len;
 856         if (flist) {
 857                 bp = pool_alloc(flist->file_pool, alloc_len,
 858                     "receive_file_entry");
 859         } else {
 860                 if (!(bp = new_array(char, alloc_len)))
 861                         out_of_memory("receive_file_entry");
 862         }
 863
 864         file = (struct file_struct *)bp;
 865         memset(bp, 0, file_struct_len);
 866         bp += file_struct_len;
 867
 868         file->flags = flags;
 869         file->modtime = st.st_mtime;
 870         file->length = st.st_size;
 871         file->mode = st.st_mode;
 872         file->uid = st.st_uid;
 873         file->gid = st.st_gid;
 874
 875 #if SUPPORT_HARD_LINKS
 876         if (flist && flist->hlink_pool) {
 877                 if (protocol_version < 28) {
 878                         if (S_ISREG(st.st_mode))
 879                                 file->link_u.idev = pool_talloc(
 880                                     flist->hlink_pool, struct idev, 1,
 881                                     "inode_table");
 882                 } else {
 883                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 884                                 file->link_u.idev = pool_talloc(
 885                                     flist->hlink_pool, struct idev, 1,
 886                                     "inode_table");
 887                 }
 888         }
 889         if (file->link_u.idev) {
 890                 file->F_DEV = st.st_dev;
 891                 file->F_INODE = st.st_ino;
 892         }
 893 #endif
 894
 895         if (dirname_len) {
 896                 file->dirname = lastdir = bp;
 897                 lastdir_len = dirname_len - 1;
 898                 memcpy(bp, dirname, dirname_len - 1);
 899                 bp += dirname_len;
 900                 bp[-1] = '\0';
 901         } else if (dirname)
 902                 file->dirname = dirname;
 903
 904         file->basename = bp;
 905         memcpy(bp, basename, basename_len);
 906         bp += basename_len;
 907
 908 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 909         if (preserve_devices && IS_DEVICE(st.st_mode))
 910                 file->u.rdev = st.st_rdev;
 911 #endif
 912
 913 #if SUPPORT_LINKS
 914         if (linkname_len) {
 915                 file->u.link = bp;
 916                 memcpy(bp, linkname, linkname_len);
 917                 bp += linkname_len;
 918         }
 919 #endif
 920
 921         if (sum_len) {
 922                 file->u.sum = bp;
 923                 file_checksum(thisname, bp, st.st_size);
 924                 /*bp += sum_len;*/
 925         }
 926
 927         file->basedir = flist_dir;
 928
 929         if (!S_ISDIR(st.st_mode))
 930                 stats.total_size += st.st_size;
 931
 932         return file;
 933 }
 934
 935
 936 void send_file_name(int f, struct file_list *flist, char *fname,
 937                     int recursive, unsigned short base_flags)
 938 {
 939         struct file_struct *file;
 940         char fbuf[MAXPATHLEN];
 941
 942         /* f is set to -1 when calculating deletion file list */
 943         file = make_file(fname, flist,
 944             f == -1 && delete_excluded? SERVER_EXCLUDES : ALL_EXCLUDES);
 945
 946         if (!file)
 947                 return;
 948
 949         maybe_emit_filelist_progress(flist);
 950
 951         flist_expand(flist);
 952
 953         if (write_batch)
 954                 file->flags |= FLAG_TOP_DIR;
 955
 956         if (file->basename[0]) {
 957                 flist->files[flist->count++] = file;
 958                 send_file_entry(file, f, base_flags);
 959         }
 960
 961         if (recursive && S_ISDIR(file->mode)
 962             && !(file->flags & FLAG_MOUNT_POINT)) {
 963                 struct exclude_list_struct last_list = local_exclude_list;
 964                 local_exclude_list.head = local_exclude_list.tail = NULL;
 965                 send_directory(f, flist, f_name_to(file, fbuf));
 966                 if (verbose > 2) {
 967                         rprintf(FINFO, "[%s] popping %sexclude list\n",
 968                                 who_am_i(), local_exclude_list.debug_type);
 969                 }
 970                 clear_exclude_list(&local_exclude_list);
 971                 local_exclude_list = last_list;
 972         }
 973 }
 974
 975
 976 static void send_directory(int f, struct file_list *flist, char *dir)
 977 {
 978         DIR *d;
 979         struct dirent *di;
 980         char fname[MAXPATHLEN];
 981         unsigned int offset;
 982         char *p;
 983
 984         d = opendir(dir);
 985         if (!d) {
 986                 io_error |= IOERR_GENERAL;
 987                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(dir));
 988                 return;
 989         }
 990
 991         offset = strlcpy(fname, dir, MAXPATHLEN);
 992         p = fname + offset;
 993         if (offset >= MAXPATHLEN || p[-1] != '/') {
 994                 if (offset >= MAXPATHLEN - 1) {
 995                         io_error |= IOERR_GENERAL;
 996                         rprintf(FERROR, "skipping long-named directory: %s\n",
 997                                 full_fname(fname));
 998                         closedir(d);
 999                         return;
1000                 }
1001                 *p++ = '/';
1002                 offset++;
1003         }
1004
1005         if (cvs_exclude) {
1006                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
1007                     < MAXPATHLEN - offset) {
1008                         add_exclude_file(&local_exclude_list, fname,
1009                                          XFLG_WORD_SPLIT | XFLG_WORDS_ONLY);
1010                 } else {
1011                         io_error |= IOERR_GENERAL;
1012                         rprintf(FINFO,
1013                                 "cannot cvs-exclude in long-named directory %s\n",
1014                                 full_fname(fname));
1015                 }
1016         }
1017
1018         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1019                 char *dname = d_name(di);
1020                 if (dname[0] == '.' && (dname[1] == '\0'
1021                     || (dname[1] == '.' && dname[2] == '\0')))
1022                         continue;
1023                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
1024                         send_file_name(f, flist, fname, recurse, 0);
1025                 else {
1026                         io_error |= IOERR_GENERAL;
1027                         rprintf(FINFO,
1028                                 "cannot send long-named file %s\n",
1029                                 full_fname(fname));
1030                 }
1031         }
1032         if (errno) {
1033                 io_error |= IOERR_GENERAL;
1034                 rsyserr(FERROR, errno, "readdir(%s)", dir);
1035         }
1036
1037         closedir(d);
1038 }
1039
1040
1041 /**
1042  * This function is normally called by the sender, but the receiver also
1043  * uses it to construct its own file list if --delete has been specified.
1044  * The delete_files() function in receiver.c sets f to -1 so that we just
1045  * construct the file list in memory without sending it over the wire.  It
1046  * also has the side-effect of ignoring user-excludes if delete_excluded
1047  * is set (so that the delete list includes user-excluded files).
1048  **/
1049 struct file_list *send_file_list(int f, int argc, char *argv[])
1050 {
1051         int l;
1052         STRUCT_STAT st;
1053         char *p, *dir, olddir[sizeof curr_dir];
1054         char lastpath[MAXPATHLEN] = "";
1055         struct file_list *flist;
1056         int64 start_write;
1057         int use_ff_fd = 0;
1058
1059         if (show_filelist_p() && f != -1)
1060                 start_filelist_progress("building file list");
1061
1062         start_write = stats.total_written;
1063
1064         flist = flist_new(f == -1 ? WITHOUT_HLINK : WITH_HLINK,
1065             "send_file_list");
1066
1067         if (f != -1) {
1068                 io_start_buffering_out(f);
1069                 if (filesfrom_fd >= 0) {
1070                         if (argv[0] && !push_dir(argv[0])) {
1071                                 rsyserr(FERROR, errno, "push_dir %s failed",
1072                                         full_fname(argv[0]));
1073                                 exit_cleanup(RERR_FILESELECT);
1074                         }
1075                         use_ff_fd = 1;
1076                 }
1077         }
1078
1079         while (1) {
1080                 char fname2[MAXPATHLEN];
1081                 char *fname = fname2;
1082
1083                 if (use_ff_fd) {
1084                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1085                                 break;
1086                         sanitize_path(fname, NULL);
1087                 } else {
1088                         if (argc-- == 0)
1089                                 break;
1090                         strlcpy(fname, *argv++, MAXPATHLEN);
1091                         if (sanitize_paths)
1092                                 sanitize_path(fname, NULL);
1093                 }
1094
1095                 l = strlen(fname);
1096                 if (fname[l - 1] == '/') {
1097                         if (l == 2 && fname[0] == '.') {
1098                                 /* Turn "./" into just "." rather than "./." */
1099                                 fname[1] = '\0';
1100                         } else if (l < MAXPATHLEN) {
1101                                 fname[l++] = '.';
1102                                 fname[l] = '\0';
1103                         }
1104                 }
1105
1106                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1107                         if (f != -1) {
1108                                 io_error |= IOERR_GENERAL;
1109                                 rsyserr(FERROR, errno, "link_stat %s failed",
1110                                         full_fname(fname));
1111                         }
1112                         continue;
1113                 }
1114
1115                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1116                         rprintf(FINFO, "skipping directory %s\n", fname);
1117                         continue;
1118                 }
1119
1120                 dir = NULL;
1121                 olddir[0] = '\0';
1122
1123                 if (!relative_paths) {
1124                         p = strrchr(fname, '/');
1125                         if (p) {
1126                                 *p = 0;
1127                                 if (p == fname)
1128                                         dir = "/";
1129                                 else
1130                                         dir = fname;
1131                                 fname = p + 1;
1132                         }
1133                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1134                         /* this ensures we send the intermediate directories,
1135                            thus getting their permissions right */
1136                         char *lp = lastpath, *fn = fname, *slash = fname;
1137                         *p = 0;
1138                         /* Skip any initial directories in our path that we
1139                          * have in common with lastpath. */
1140                         while (*fn && *lp == *fn) {
1141                                 if (*fn == '/')
1142                                         slash = fn;
1143                                 lp++, fn++;
1144                         }
1145                         *p = '/';
1146                         if (fn != p || (*lp && *lp != '/')) {
1147                                 int copy_links_saved = copy_links;
1148                                 int recurse_saved = recurse;
1149                                 copy_links = copy_unsafe_links;
1150                                 /* set recurse to 1 to prevent make_file
1151                                  * from ignoring directory, but still
1152                                  * turn off the recursive parameter to
1153                                  * send_file_name */
1154                                 recurse = 1;
1155                                 while ((slash = strchr(slash+1, '/')) != 0) {
1156                                         *slash = 0;
1157                                         send_file_name(f, flist, fname, 0, 0);
1158                                         *slash = '/';
1159                                 }
1160                                 copy_links = copy_links_saved;
1161                                 recurse = recurse_saved;
1162                                 *p = 0;
1163                                 strlcpy(lastpath, fname, sizeof lastpath);
1164                                 *p = '/';
1165                         }
1166                 }
1167
1168                 if (!*fname)
1169                         fname = ".";
1170
1171                 if (dir && *dir) {
1172                         static char *lastdir;
1173                         static int lastdir_len;
1174
1175                         strcpy(olddir, curr_dir); /* can't overflow */
1176
1177                         if (!push_dir(dir)) {
1178                                 io_error |= IOERR_GENERAL;
1179                                 rsyserr(FERROR, errno, "push_dir %s failed",
1180                                         full_fname(dir));
1181                                 continue;
1182                         }
1183
1184                         if (lastdir && strcmp(lastdir, dir) == 0) {
1185                                 flist_dir = lastdir;
1186                                 flist_dir_len = lastdir_len;
1187                         } else {
1188                                 flist_dir = lastdir = strdup(dir);
1189                                 flist_dir_len = lastdir_len = strlen(dir);
1190                         }
1191                 }
1192
1193                 if (one_file_system)
1194                         set_filesystem(fname);
1195
1196                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1197
1198                 if (olddir[0]) {
1199                         flist_dir = NULL;
1200                         flist_dir_len = 0;
1201                         if (!pop_dir(olddir)) {
1202                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1203                                         full_fname(dir));
1204                                 exit_cleanup(RERR_FILESELECT);
1205                         }
1206                 }
1207         }
1208
1209         if (f != -1) {
1210                 send_file_entry(NULL, f, 0);
1211
1212                 if (show_filelist_p())
1213                         finish_filelist_progress(flist);
1214         }
1215
1216         if (flist->hlink_pool) {
1217                 pool_destroy(flist->hlink_pool);
1218                 flist->hlink_pool = NULL;
1219         }
1220
1221         clean_flist(flist, 0, 0);
1222
1223         if (f != -1) {
1224                 /* Now send the uid/gid list. This was introduced in
1225                  * protocol version 15 */
1226                 send_uid_list(f);
1227
1228                 /* send the io_error flag */
1229                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1230
1231                 io_end_buffering();
1232                 stats.flist_size = stats.total_written - start_write;
1233                 stats.num_files = flist->count;
1234                 if (write_batch)
1235                         write_batch_flist_info(flist->count, flist->files);
1236         }
1237
1238         if (verbose > 3)
1239                 output_flist(flist);
1240
1241         if (verbose > 2)
1242                 rprintf(FINFO, "send_file_list done\n");
1243
1244         return flist;
1245 }
1246
1247
1248 struct file_list *recv_file_list(int f)
1249 {
1250         struct file_list *flist;
1251         unsigned short flags;
1252         int64 start_read;
1253
1254         if (show_filelist_p())
1255                 start_filelist_progress("receiving file list");
1256
1257         start_read = stats.total_read;
1258
1259         flist = flist_new(WITH_HLINK, "recv_file_list");
1260
1261         flist->count = 0;
1262         flist->malloced = 1000;
1263         flist->files = new_array(struct file_struct *, flist->malloced);
1264         if (!flist->files)
1265                 goto oom;
1266
1267
1268         while ((flags = read_byte(f)) != 0) {
1269                 int i = flist->count;
1270
1271                 flist_expand(flist);
1272
1273                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1274                         flags |= read_byte(f) << 8;
1275                 receive_file_entry(&flist->files[i], flags, flist, f);
1276
1277                 if (S_ISREG(flist->files[i]->mode))
1278                         stats.total_size += flist->files[i]->length;
1279
1280                 flist->count++;
1281
1282                 maybe_emit_filelist_progress(flist);
1283
1284                 if (verbose > 2) {
1285                         rprintf(FINFO, "recv_file_name(%s)\n",
1286                                 f_name(flist->files[i]));
1287                 }
1288         }
1289         receive_file_entry(NULL, 0, NULL, 0); /* Signal that we're done. */
1290
1291         if (verbose > 2)
1292                 rprintf(FINFO, "received %d names\n", flist->count);
1293
1294         if (show_filelist_p())
1295                 finish_filelist_progress(flist);
1296
1297         clean_flist(flist, relative_paths, 1);
1298
1299         if (f != -1) {
1300                 /* Now send the uid/gid list. This was introduced in
1301                  * protocol version 15 */
1302                 recv_uid_list(f, flist);
1303
1304                 if (!read_batch) {
1305                         /* Recv the io_error flag */
1306                         if (lp_ignore_errors(module_id) || ignore_errors)
1307                                 read_int(f);
1308                         else
1309                                 io_error |= read_int(f);
1310                 }
1311         }
1312
1313         if (verbose > 3)
1314                 output_flist(flist);
1315
1316         if (list_only) {
1317                 int i;
1318                 for (i = 0; i < flist->count; i++)
1319                         list_file_entry(flist->files[i]);
1320         }
1321
1322         if (verbose > 2)
1323                 rprintf(FINFO, "recv_file_list done\n");
1324
1325         stats.flist_size = stats.total_read - start_read;
1326         stats.num_files = flist->count;
1327
1328         return flist;
1329
1330 oom:
1331         out_of_memory("recv_file_list");
1332         return NULL;            /* not reached */
1333 }
1334
1335
1336 int file_compare(struct file_struct **file1, struct file_struct **file2)
1337 {
1338         struct file_struct *f1 = *file1;
1339         struct file_struct *f2 = *file2;
1340
1341         if (!f1->basename && !f2->basename)
1342                 return 0;
1343         if (!f1->basename)
1344                 return -1;
1345         if (!f2->basename)
1346                 return 1;
1347         if (f1->dirname == f2->dirname)
1348                 return u_strcmp(f1->basename, f2->basename);
1349         return f_name_cmp(f1, f2);
1350 }
1351
1352
1353 int flist_find(struct file_list *flist, struct file_struct *f)
1354 {
1355         int low = 0, high = flist->count - 1;
1356
1357         while (high >= 0 && !flist->files[high]->basename) high--;
1358
1359         if (high < 0)
1360                 return -1;
1361
1362         while (low != high) {
1363                 int mid = (low + high) / 2;
1364                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1365                 if (ret == 0)
1366                         return flist_up(flist, mid);
1367                 if (ret > 0)
1368                         high = mid;
1369                 else
1370                         low = mid + 1;
1371         }
1372
1373         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1374                 return flist_up(flist, low);
1375         return -1;
1376 }
1377
1378 /*
1379  * Free up any resources a file_struct has allocated
1380  * and clear the file.
1381  */
1382 void clear_file(int i, struct file_list *flist)
1383 {
1384         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1385                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1386         memset(flist->files[i], 0, file_struct_len);
1387 }
1388
1389
1390 /*
1391  * allocate a new file list
1392  */
1393 struct file_list *flist_new(int with_hlink, char *msg)
1394 {
1395         struct file_list *flist;
1396
1397         flist = new(struct file_list);
1398         if (!flist)
1399                 out_of_memory(msg);
1400
1401         memset(flist, 0, sizeof (struct file_list));
1402
1403         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1404             out_of_memory, POOL_INTERN)))
1405                 out_of_memory(msg);
1406
1407 #if SUPPORT_HARD_LINKS
1408         if (with_hlink && preserve_hard_links) {
1409                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1410                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1411                         out_of_memory(msg);
1412         }
1413 #endif
1414
1415         return flist;
1416 }
1417
1418 /*
1419  * free up all elements in a flist
1420  */
1421 void flist_free(struct file_list *flist)
1422 {
1423         pool_destroy(flist->file_pool);
1424         pool_destroy(flist->hlink_pool);
1425         free(flist->files);
1426         free(flist);
1427 }
1428
1429
1430 /*
1431  * This routine ensures we don't have any duplicate names in our file list.
1432  * duplicate names can cause corruption because of the pipelining
1433  */
1434 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1435 {
1436         int i, prev_i = 0;
1437
1438         if (!flist || flist->count == 0)
1439                 return;
1440
1441         qsort(flist->files, flist->count,
1442             sizeof flist->files[0], (int (*)())file_compare);
1443
1444         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1445                 if (flist->files[i]->basename) {
1446                         prev_i = i;
1447                         break;
1448                 }
1449         }
1450         while (++i < flist->count) {
1451                 if (!flist->files[i]->basename)
1452                         continue;
1453                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1454                         if (verbose > 1 && !am_server) {
1455                                 rprintf(FINFO,
1456                                         "removing duplicate name %s from file list %d\n",
1457                                         f_name(flist->files[i]), i);
1458                         }
1459                         /* Make sure that if we unduplicate '.', that we don't
1460                          * lose track of a user-specified starting point (or
1461                          * else deletions will mysteriously fail with -R). */
1462                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1463                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1464
1465                         clear_file(i, flist);
1466                 } else
1467                         prev_i = i;
1468         }
1469
1470         if (strip_root) {
1471                 /* we need to strip off the root directory in the case
1472                    of relative paths, but this must be done _after_
1473                    the sorting phase */
1474                 for (i = 0; i < flist->count; i++) {
1475                         if (flist->files[i]->dirname &&
1476                             flist->files[i]->dirname[0] == '/') {
1477                                 memmove(&flist->files[i]->dirname[0],
1478                                         &flist->files[i]->dirname[1],
1479                                         strlen(flist->files[i]->dirname));
1480                         }
1481
1482                         if (flist->files[i]->dirname &&
1483                             !flist->files[i]->dirname[0]) {
1484                                 flist->files[i]->dirname = NULL;
1485                         }
1486                 }
1487         }
1488 }
1489
1490 static void output_flist(struct file_list *flist)
1491 {
1492         char uidbuf[16], gidbuf[16];
1493         struct file_struct *file;
1494         int i;
1495
1496         for (i = 0; i < flist->count; i++) {
1497                 file = flist->files[i];
1498                 if (am_root && preserve_uid)
1499                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1500                 else
1501                         *uidbuf = '\0';
1502                 if (preserve_gid && file->gid != GID_NONE)
1503                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1504                 else
1505                         *gidbuf = '\0';
1506                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1507                         who_am_i(), i, NS(file->basedir), NS(file->dirname),
1508                         NS(file->basename), (int)file->mode,
1509                         (double)file->length, uidbuf, gidbuf);
1510         }
1511 }
1512
1513
1514 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1515
1516 /* Compare the names of two file_struct entities, just like strcmp()
1517  * would do if it were operating on the joined strings.  We assume
1518  * that there are no 0-length strings.
1519  */
1520 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1521 {
1522         int dif;
1523         const uchar *c1, *c2;
1524         enum fnc_state state1, state2;
1525
1526         if (!f1 || !f1->basename) {
1527                 if (!f2 || !f2->basename)
1528                         return 0;
1529                 return -1;
1530         }
1531         if (!f2 || !f2->basename)
1532                 return 1;
1533
1534         if (!(c1 = (uchar*)f1->dirname)) {
1535                 state1 = fnc_BASE;
1536                 c1 = (uchar*)f1->basename;
1537         } else if (!*c1) {
1538                 state1 = fnc_SLASH;
1539                 c1 = (uchar*)"/";
1540         } else
1541                 state1 = fnc_DIR;
1542         if (!(c2 = (uchar*)f2->dirname)) {
1543                 state2 = fnc_BASE;
1544                 c2 = (uchar*)f2->basename;
1545         } else if (!*c2) {
1546                 state2 = fnc_SLASH;
1547                 c2 = (uchar*)"/";
1548         } else
1549                 state2 = fnc_DIR;
1550
1551         while (1) {
1552                 if ((dif = (int)*c1 - (int)*c2) != 0)
1553                         break;
1554                 if (!*++c1) {
1555                         switch (state1) {
1556                         case fnc_DIR:
1557                                 state1 = fnc_SLASH;
1558                                 c1 = (uchar*)"/";
1559                                 break;
1560                         case fnc_SLASH:
1561                                 state1 = fnc_BASE;
1562                                 c1 = (uchar*)f1->basename;
1563                                 break;
1564                         case fnc_BASE:
1565                                 break;
1566                         }
1567                 }
1568                 if (!*++c2) {
1569                         switch (state2) {
1570                         case fnc_DIR:
1571                                 state2 = fnc_SLASH;
1572                                 c2 = (uchar*)"/";
1573                                 break;
1574                         case fnc_SLASH:
1575                                 state2 = fnc_BASE;
1576                                 c2 = (uchar*)f2->basename;
1577                                 break;
1578                         case fnc_BASE:
1579                                 if (!*c1)
1580                                         return 0;
1581                                 break;
1582                         }
1583                 }
1584         }
1585
1586         return dif;
1587 }
1588
1589
1590 /* Return a copy of the full filename of a flist entry, using the indicated
1591  * buffer.  No size-checking is done because we checked the size when creating
1592  * the file_struct entry.
1593  */
1594 char *f_name_to(struct file_struct *f, char *fbuf)
1595 {
1596         if (!f || !f->basename)
1597                 return NULL;
1598
1599         if (f->dirname) {
1600                 int len = strlen(f->dirname);
1601                 memcpy(fbuf, f->dirname, len);
1602                 fbuf[len] = '/';
1603                 strcpy(fbuf + len + 1, f->basename);
1604         } else
1605                 strcpy(fbuf, f->basename);
1606         return fbuf;
1607 }
1608
1609
1610 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1611  */
1612 char *f_name(struct file_struct *f)
1613 {
1614         static char names[5][MAXPATHLEN];
1615         static unsigned int n;
1616
1617         n = (n + 1) % (sizeof names / sizeof names[0]);
1618
1619         return f_name_to(f, names[n]);
1620 }