flist.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /** @file flist.c
  22  * Generate and receive file lists
  23  *
  24  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
  25  *
  26  **/
  27
  28 #include "rsync.h"
  29
  30 extern struct stats stats;
  31
  32 extern int verbose;
  33 extern int do_progress;
  34 extern int am_root;
  35 extern int am_server;
  36 extern int am_daemon;
  37 extern int am_sender;
  38 extern int always_checksum;
  39 extern int module_id;
  40 extern int ignore_errors;
  41 extern int numeric_ids;
  42
  43 extern int cvs_exclude;
  44
  45 extern int recurse;
  46 extern char curr_dir[MAXPATHLEN];
  47 extern char *files_from;
  48 extern int filesfrom_fd;
  49
  50 extern int one_file_system;
  51 extern int keep_dirlinks;
  52 extern int preserve_links;
  53 extern int preserve_hard_links;
  54 extern int preserve_perms;
  55 extern int preserve_devices;
  56 extern int preserve_uid;
  57 extern int preserve_gid;
  58 extern int relative_paths;
  59 extern int implied_dirs;
  60 extern int copy_links;
  61 extern int copy_unsafe_links;
  62 extern int protocol_version;
  63 extern int sanitize_paths;
  64 extern int delete_excluded;
  65 extern int orig_umask;
  66 extern int list_only;
  67
  68 extern struct exclude_list_struct exclude_list;
  69 extern struct exclude_list_struct server_exclude_list;
  70 extern struct exclude_list_struct local_exclude_list;
  71
  72 int io_error;
  73
  74 static char empty_sum[MD4_SUM_LENGTH];
  75 static unsigned int file_struct_len;
  76
  77 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  78 static void output_flist(struct file_list *flist);
  79
  80 void init_flist(void)
  81 {
  82         struct file_struct f;
  83
  84         /* Figure out how big the file_struct is without trailing padding */
  85         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  86 }
  87
  88
  89 static int show_filelist_p(void)
  90 {
  91         return verbose && (recurse || files_from) && !am_server;
  92 }
  93
  94 static void start_filelist_progress(char *kind)
  95 {
  96         rprintf(FINFO, "%s ... ", kind);
  97         if (verbose > 1 || do_progress)
  98                 rprintf(FINFO, "\n");
  99         rflush(FINFO);
 100 }
 101
 102
 103 static void emit_filelist_progress(const struct file_list *flist)
 104 {
 105         rprintf(FINFO, " %d files...\r", flist->count);
 106 }
 107
 108
 109 static void maybe_emit_filelist_progress(const struct file_list *flist)
 110 {
 111         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
 112                 emit_filelist_progress(flist);
 113 }
 114
 115
 116 static void finish_filelist_progress(const struct file_list *flist)
 117 {
 118         if (do_progress) {
 119                 /* This overwrites the progress line */
 120                 rprintf(FINFO, "%d file%sto consider\n",
 121                         flist->count, flist->count == 1 ? " " : "s ");
 122         } else
 123                 rprintf(FINFO, "done\n");
 124 }
 125
 126 void show_flist_stats(void)
 127 {
 128         /* Nothing yet */
 129 }
 130
 131
 132 static void list_file_entry(struct file_struct *f)
 133 {
 134         char perms[11];
 135
 136         if (!f->basename) {
 137                 /* this can happen if duplicate names were removed */
 138                 return;
 139         }
 140
 141         permstring(perms, f->mode);
 142
 143 #if SUPPORT_LINKS
 144         if (preserve_links && S_ISLNK(f->mode)) {
 145                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 146                         perms,
 147                         (double)f->length, timestring(f->modtime),
 148                         f_name(f), f->u.link);
 149         } else
 150 #endif
 151         {
 152                 rprintf(FINFO, "%s %11.0f %s %s\n",
 153                         perms,
 154                         (double)f->length, timestring(f->modtime),
 155                         f_name(f));
 156         }
 157 }
 158
 159
 160 /**
 161  * Stat either a symlink or its referent, depending on the settings of
 162  * copy_links, copy_unsafe_links, etc.
 163  *
 164  * @retval -1 on error
 165  *
 166  * @retval 0 for success
 167  *
 168  * @post If @p path is a symlink, then @p linkbuf (of size @c
 169  * MAXPATHLEN) contains the symlink target.
 170  *
 171  * @post @p buffer contains information about the link or the
 172  * referrent as appropriate, if they exist.
 173  **/
 174 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 175 {
 176 #if SUPPORT_LINKS
 177         if (copy_links)
 178                 return do_stat(path, buffer);
 179         if (link_stat(path, buffer, keep_dirlinks) < 0)
 180                 return -1;
 181         if (S_ISLNK(buffer->st_mode)) {
 182                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 183                 if (l == -1)
 184                         return -1;
 185                 linkbuf[l] = 0;
 186                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 187                         if (verbose > 1) {
 188                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 189                                         path, linkbuf);
 190                         }
 191                         return do_stat(path, buffer);
 192                 }
 193         }
 194         return 0;
 195 #else
 196         return do_stat(path, buffer);
 197 #endif
 198 }
 199
 200 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 201 {
 202 #if SUPPORT_LINKS
 203         if (copy_links)
 204                 return do_stat(path, buffer);
 205         if (do_lstat(path, buffer) < 0)
 206                 return -1;
 207         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 208                 STRUCT_STAT st;
 209                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 210                         *buffer = st;
 211         }
 212         return 0;
 213 #else
 214         return do_stat(path, buffer);
 215 #endif
 216 }
 217
 218 /*
 219  * This function is used to check if a file should be included/excluded
 220  * from the list of files based on its name and type etc.  The value of
 221  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 222  */
 223 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 224 {
 225         int rc;
 226
 227 #if 0 /* This currently never happens, so avoid a useless compare. */
 228         if (exclude_level == NO_EXCLUDES)
 229                 return 0;
 230 #endif
 231         if (fname) {
 232                 /* never exclude '.', even if somebody does --exclude '*' */
 233                 if (fname[0] == '.' && !fname[1])
 234                         return 0;
 235                 /* Handle the -R version of the '.' dir. */
 236                 if (fname[0] == '/') {
 237                         int len = strlen(fname);
 238                         if (fname[len-1] == '.' && fname[len-2] == '/')
 239                                 return 0;
 240                 }
 241         }
 242         if (server_exclude_list.head
 243             && check_exclude(&server_exclude_list, fname, is_dir) < 0)
 244                 return 1;
 245         if (exclude_level != ALL_EXCLUDES)
 246                 return 0;
 247         if (exclude_list.head
 248             && (rc = check_exclude(&exclude_list, fname, is_dir)) != 0)
 249                 return rc < 0;
 250         if (local_exclude_list.head
 251             && check_exclude(&local_exclude_list, fname, is_dir) < 0)
 252                 return 1;
 253         return 0;
 254 }
 255
 256 /* used by the one_file_system code */
 257 static dev_t filesystem_dev;
 258
 259 static void set_filesystem(char *fname)
 260 {
 261         STRUCT_STAT st;
 262         if (do_stat(fname, &st) != 0)
 263                 return;
 264         filesystem_dev = st.st_dev;
 265 }
 266
 267
 268 static int to_wire_mode(mode_t mode)
 269 {
 270 #if SUPPORT_LINKS
 271         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 272                 return (mode & ~(_S_IFMT)) | 0120000;
 273 #endif
 274         return (int)mode;
 275 }
 276
 277 static mode_t from_wire_mode(int mode)
 278 {
 279         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 280                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 281         return (mode_t)mode;
 282 }
 283
 284
 285 static void send_directory(int f, struct file_list *flist, char *dir);
 286
 287 static char *flist_dir;
 288 static int flist_dir_len;
 289
 290
 291 /**
 292  * Make sure @p flist is big enough to hold at least @p flist->count
 293  * entries.
 294  **/
 295 void flist_expand(struct file_list *flist)
 296 {
 297         struct file_struct **new_ptr;
 298
 299         if (flist->count < flist->malloced)
 300                 return;
 301
 302         if (flist->malloced < FLIST_START)
 303                 flist->malloced = FLIST_START;
 304         else if (flist->malloced >= FLIST_LINEAR)
 305                 flist->malloced += FLIST_LINEAR;
 306         else
 307                 flist->malloced *= 2;
 308
 309         /*
 310          * In case count jumped or we are starting the list
 311          * with a known size just set it.
 312          */
 313         if (flist->malloced < flist->count)
 314                 flist->malloced = flist->count;
 315
 316         new_ptr = realloc_array(flist->files, struct file_struct *,
 317                                 flist->malloced);
 318
 319         if (verbose >= 2) {
 320                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 321                     who_am_i(),
 322                     (double)sizeof flist->files[0] * flist->malloced,
 323                     (new_ptr == flist->files) ? " not" : "");
 324         }
 325
 326         flist->files = new_ptr;
 327
 328         if (!flist->files)
 329                 out_of_memory("flist_expand");
 330 }
 331
 332 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 333 {
 334         unsigned short flags;
 335         static time_t modtime;
 336         static mode_t mode;
 337         static uint64 dev;
 338         static dev_t rdev;
 339         static uint32 rdev_major;
 340         static uid_t uid;
 341         static gid_t gid;
 342         static char lastname[MAXPATHLEN];
 343         char fname[MAXPATHLEN];
 344         int l1, l2;
 345
 346         if (f == -1)
 347                 return;
 348
 349         if (!file) {
 350                 write_byte(f, 0);
 351                 modtime = 0, mode = 0;
 352                 dev = 0, rdev = makedev(0, 0);
 353                 rdev_major = 0;
 354                 uid = 0, gid = 0;
 355                 *lastname = '\0';
 356                 return;
 357         }
 358
 359         io_write_phase = "send_file_entry";
 360
 361         f_name_to(file, fname);
 362
 363         flags = base_flags;
 364
 365         if (file->mode == mode)
 366                 flags |= XMIT_SAME_MODE;
 367         else
 368                 mode = file->mode;
 369         if (preserve_devices) {
 370                 if (protocol_version < 28) {
 371                         if (IS_DEVICE(mode)) {
 372                                 if (file->u.rdev == rdev)
 373                                         flags |= XMIT_SAME_RDEV_pre28;
 374                                 else
 375                                         rdev = file->u.rdev;
 376                         } else
 377                                 rdev = makedev(0, 0);
 378                 } else if (IS_DEVICE(mode)) {
 379                         rdev = file->u.rdev;
 380                         if ((uint32)major(rdev) == rdev_major)
 381                                 flags |= XMIT_SAME_RDEV_MAJOR;
 382                         else
 383                                 rdev_major = major(rdev);
 384                         if ((uint32)minor(rdev) <= 0xFFu)
 385                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 386                 }
 387         }
 388         if (file->uid == uid)
 389                 flags |= XMIT_SAME_UID;
 390         else
 391                 uid = file->uid;
 392         if (file->gid == gid)
 393                 flags |= XMIT_SAME_GID;
 394         else
 395                 gid = file->gid;
 396         if (file->modtime == modtime)
 397                 flags |= XMIT_SAME_TIME;
 398         else
 399                 modtime = file->modtime;
 400
 401 #if SUPPORT_HARD_LINKS
 402         if (file->link_u.idev) {
 403                 if (file->F_DEV == dev) {
 404                         if (protocol_version >= 28)
 405                                 flags |= XMIT_SAME_DEV;
 406                 } else
 407                         dev = file->F_DEV;
 408                 flags |= XMIT_HAS_IDEV_DATA;
 409         }
 410 #endif
 411
 412         for (l1 = 0;
 413             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 414             l1++) {}
 415         l2 = strlen(fname+l1);
 416
 417         if (l1 > 0)
 418                 flags |= XMIT_SAME_NAME;
 419         if (l2 > 255)
 420                 flags |= XMIT_LONG_NAME;
 421
 422         /* We must make sure we don't send a zero flag byte or the
 423          * other end will terminate the flist transfer.  Note that
 424          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 425          * it's harmless way to add a bit to the first flag byte. */
 426         if (protocol_version >= 28) {
 427                 if (!flags && !S_ISDIR(mode))
 428                         flags |= XMIT_TOP_DIR;
 429                 if ((flags & 0xFF00) || !flags) {
 430                         flags |= XMIT_EXTENDED_FLAGS;
 431                         write_byte(f, flags);
 432                         write_byte(f, flags >> 8);
 433                 } else
 434                         write_byte(f, flags);
 435         } else {
 436                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 437                         flags |= XMIT_TOP_DIR;
 438                 if (!(flags & 0xFF))
 439                         flags |= XMIT_LONG_NAME;
 440                 write_byte(f, flags);
 441         }
 442         if (flags & XMIT_SAME_NAME)
 443                 write_byte(f, l1);
 444         if (flags & XMIT_LONG_NAME)
 445                 write_int(f, l2);
 446         else
 447                 write_byte(f, l2);
 448         write_buf(f, fname + l1, l2);
 449
 450         write_longint(f, file->length);
 451         if (!(flags & XMIT_SAME_TIME))
 452                 write_int(f, modtime);
 453         if (!(flags & XMIT_SAME_MODE))
 454                 write_int(f, to_wire_mode(mode));
 455         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 456                 if (!numeric_ids)
 457                         add_uid(uid);
 458                 write_int(f, uid);
 459         }
 460         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 461                 if (!numeric_ids)
 462                         add_gid(gid);
 463                 write_int(f, gid);
 464         }
 465         if (preserve_devices && IS_DEVICE(mode)) {
 466                 if (protocol_version < 28) {
 467                         if (!(flags & XMIT_SAME_RDEV_pre28))
 468                                 write_int(f, (int)rdev);
 469                 } else {
 470                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 471                                 write_int(f, major(rdev));
 472                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 473                                 write_byte(f, minor(rdev));
 474                         else
 475                                 write_int(f, minor(rdev));
 476                 }
 477         }
 478
 479 #if SUPPORT_LINKS
 480         if (preserve_links && S_ISLNK(mode)) {
 481                 int len = strlen(file->u.link);
 482                 write_int(f, len);
 483                 write_buf(f, file->u.link, len);
 484         }
 485 #endif
 486
 487 #if SUPPORT_HARD_LINKS
 488         if (flags & XMIT_HAS_IDEV_DATA) {
 489                 if (protocol_version < 26) {
 490                         /* 32-bit dev_t and ino_t */
 491                         write_int(f, dev);
 492                         write_int(f, file->F_INODE);
 493                 } else {
 494                         /* 64-bit dev_t and ino_t */
 495                         if (!(flags & XMIT_SAME_DEV))
 496                                 write_longint(f, dev);
 497                         write_longint(f, file->F_INODE);
 498                 }
 499         }
 500 #endif
 501
 502         if (always_checksum) {
 503                 char *sum;
 504                 if (S_ISREG(mode))
 505                         sum = file->u.sum;
 506                 else if (protocol_version < 28) {
 507                         /* Prior to 28, we sent a useless set of nulls. */
 508                         sum = empty_sum;
 509                 } else
 510                         sum = NULL;
 511                 if (sum) {
 512                         write_buf(f, sum,
 513                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 514                 }
 515         }
 516
 517         strlcpy(lastname, fname, MAXPATHLEN);
 518
 519         io_write_phase = "unknown";
 520 }
 521
 522
 523
 524 void receive_file_entry(struct file_struct **fptr, unsigned short flags,
 525                         struct file_list *flist, int f)
 526 {
 527         static time_t modtime;
 528         static mode_t mode;
 529         static uint64 dev;
 530         static dev_t rdev;
 531         static uint32 rdev_major;
 532         static uid_t uid;
 533         static gid_t gid;
 534         static char lastname[MAXPATHLEN], *lastdir;
 535         static int lastdir_depth, lastdir_len = -1;
 536         char thisname[MAXPATHLEN];
 537         unsigned int l1 = 0, l2 = 0;
 538         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 539         OFF_T file_length;
 540         char *basename, *dirname, *bp;
 541         struct file_struct *file;
 542
 543         if (!fptr) {
 544                 modtime = 0, mode = 0;
 545                 dev = 0, rdev = makedev(0, 0);
 546                 rdev_major = 0;
 547                 uid = 0, gid = 0;
 548                 *lastname = '\0';
 549                 lastdir_len = -1;
 550                 return;
 551         }
 552
 553         if (flags & XMIT_SAME_NAME)
 554                 l1 = read_byte(f);
 555
 556         if (flags & XMIT_LONG_NAME)
 557                 l2 = read_int(f);
 558         else
 559                 l2 = read_byte(f);
 560
 561         if (l2 >= MAXPATHLEN - l1) {
 562                 rprintf(FERROR,
 563                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 564                         flags, l1, l2, lastname);
 565                 overflow("receive_file_entry");
 566         }
 567
 568         strlcpy(thisname, lastname, l1 + 1);
 569         read_sbuf(f, &thisname[l1], l2);
 570         thisname[l1 + l2] = 0;
 571
 572         strlcpy(lastname, thisname, MAXPATHLEN);
 573
 574         clean_fname(thisname, 0);
 575
 576         if (sanitize_paths)
 577                 sanitize_path(thisname, thisname, "", 0);
 578
 579         if ((basename = strrchr(thisname, '/')) != NULL) {
 580                 dirname_len = ++basename - thisname; /* counts future '\0' */
 581                 if (lastdir_len == dirname_len - 1
 582                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 583                         dirname = lastdir;
 584                         dirname_len = 0; /* indicates no copy is needed */
 585                 } else
 586                         dirname = thisname;
 587         } else {
 588                 basename = thisname;
 589                 dirname = NULL;
 590                 dirname_len = 0;
 591         }
 592         basename_len = strlen(basename) + 1; /* count the '\0' */
 593
 594         file_length = read_longint(f);
 595         if (!(flags & XMIT_SAME_TIME))
 596                 modtime = (time_t)read_int(f);
 597         if (!(flags & XMIT_SAME_MODE))
 598                 mode = from_wire_mode(read_int(f));
 599
 600         if (preserve_uid && !(flags & XMIT_SAME_UID))
 601                 uid = (uid_t)read_int(f);
 602         if (preserve_gid && !(flags & XMIT_SAME_GID))
 603                 gid = (gid_t)read_int(f);
 604
 605         if (preserve_devices) {
 606                 if (protocol_version < 28) {
 607                         if (IS_DEVICE(mode)) {
 608                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 609                                         rdev = (dev_t)read_int(f);
 610                         } else
 611                                 rdev = makedev(0, 0);
 612                 } else if (IS_DEVICE(mode)) {
 613                         uint32 rdev_minor;
 614                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 615                                 rdev_major = read_int(f);
 616                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 617                                 rdev_minor = read_byte(f);
 618                         else
 619                                 rdev_minor = read_int(f);
 620                         rdev = makedev(rdev_major, rdev_minor);
 621                 }
 622         }
 623
 624 #if SUPPORT_LINKS
 625         if (preserve_links && S_ISLNK(mode)) {
 626                 linkname_len = read_int(f) + 1; /* count the '\0' */
 627                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 628                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 629                                 linkname_len - 1);
 630                         overflow("receive_file_entry");
 631                 }
 632         }
 633         else
 634 #endif
 635                 linkname_len = 0;
 636
 637         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 638
 639         alloc_len = file_struct_len + dirname_len + basename_len
 640                   + linkname_len + sum_len;
 641         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 642
 643         file = *fptr = (struct file_struct *)bp;
 644         memset(bp, 0, file_struct_len);
 645         bp += file_struct_len;
 646
 647         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
 648         file->modtime = modtime;
 649         file->length = file_length;
 650         file->mode = mode;
 651         file->uid = uid;
 652         file->gid = gid;
 653
 654         if (dirname_len) {
 655                 file->dirname = lastdir = bp;
 656                 lastdir_len = dirname_len - 1;
 657                 memcpy(bp, dirname, dirname_len - 1);
 658                 bp += dirname_len;
 659                 bp[-1] = '\0';
 660                 if (sanitize_paths)
 661                         lastdir_depth = count_dir_elements(lastdir);
 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, bp, "", lastdir_depth);
 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, 0);
 766         if (sanitize_paths)
 767                 sanitize_path(thisname, thisname, "", 0);
 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 (file->basename[0]) {
 954                 flist->files[flist->count++] = file;
 955                 send_file_entry(file, f, base_flags);
 956         }
 957
 958         if (recursive && S_ISDIR(file->mode)
 959             && !(file->flags & FLAG_MOUNT_POINT)) {
 960                 struct exclude_list_struct last_list = local_exclude_list;
 961                 local_exclude_list.head = local_exclude_list.tail = NULL;
 962                 send_directory(f, flist, f_name_to(file, fbuf));
 963                 if (verbose > 2) {
 964                         rprintf(FINFO, "[%s] popping %sexclude list\n",
 965                                 who_am_i(), local_exclude_list.debug_type);
 966                 }
 967                 clear_exclude_list(&local_exclude_list);
 968                 local_exclude_list = last_list;
 969         }
 970 }
 971
 972
 973 static void send_directory(int f, struct file_list *flist, char *dir)
 974 {
 975         DIR *d;
 976         struct dirent *di;
 977         char fname[MAXPATHLEN];
 978         unsigned int offset;
 979         char *p;
 980
 981         d = opendir(dir);
 982         if (!d) {
 983                 io_error |= IOERR_GENERAL;
 984                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(dir));
 985                 return;
 986         }
 987
 988         offset = strlcpy(fname, dir, MAXPATHLEN);
 989         p = fname + offset;
 990         if (offset >= MAXPATHLEN || p[-1] != '/') {
 991                 if (offset >= MAXPATHLEN - 1) {
 992                         io_error |= IOERR_GENERAL;
 993                         rprintf(FERROR, "skipping long-named directory: %s\n",
 994                                 full_fname(fname));
 995                         closedir(d);
 996                         return;
 997                 }
 998                 *p++ = '/';
 999                 offset++;
1000         }
1001
1002         if (cvs_exclude) {
1003                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
1004                     < MAXPATHLEN - offset) {
1005                         add_exclude_file(&local_exclude_list, fname,
1006                                          XFLG_WORD_SPLIT | XFLG_WORDS_ONLY);
1007                 } else {
1008                         io_error |= IOERR_GENERAL;
1009                         rprintf(FINFO,
1010                                 "cannot cvs-exclude in long-named directory %s\n",
1011                                 full_fname(fname));
1012                 }
1013         }
1014
1015         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1016                 char *dname = d_name(di);
1017                 if (dname[0] == '.' && (dname[1] == '\0'
1018                     || (dname[1] == '.' && dname[2] == '\0')))
1019                         continue;
1020                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
1021                         send_file_name(f, flist, fname, recurse, 0);
1022                 else {
1023                         io_error |= IOERR_GENERAL;
1024                         rprintf(FINFO,
1025                                 "cannot send long-named file %s\n",
1026                                 full_fname(fname));
1027                 }
1028         }
1029         if (errno) {
1030                 io_error |= IOERR_GENERAL;
1031                 rsyserr(FERROR, errno, "readdir(%s)", dir);
1032         }
1033
1034         closedir(d);
1035 }
1036
1037
1038 /**
1039  * This function is normally called by the sender, but the receiver also
1040  * uses it to construct its own file list if --delete has been specified.
1041  * The delete_files() function in receiver.c sets f to -1 so that we just
1042  * construct the file list in memory without sending it over the wire.  It
1043  * also has the side-effect of ignoring user-excludes if delete_excluded
1044  * is set (so that the delete list includes user-excluded files).
1045  **/
1046 struct file_list *send_file_list(int f, int argc, char *argv[])
1047 {
1048         int l;
1049         STRUCT_STAT st;
1050         char *p, *dir, olddir[sizeof curr_dir];
1051         char lastpath[MAXPATHLEN] = "";
1052         struct file_list *flist;
1053         int64 start_write;
1054         int use_ff_fd = 0;
1055
1056         if (show_filelist_p() && f != -1)
1057                 start_filelist_progress("building file list");
1058
1059         start_write = stats.total_written;
1060
1061         flist = flist_new(f == -1 ? WITHOUT_HLINK : WITH_HLINK,
1062             "send_file_list");
1063
1064         if (f != -1) {
1065                 io_start_buffering_out();
1066                 if (filesfrom_fd >= 0) {
1067                         if (argv[0] && !push_dir(argv[0])) {
1068                                 rsyserr(FERROR, errno, "push_dir %s failed",
1069                                         full_fname(argv[0]));
1070                                 exit_cleanup(RERR_FILESELECT);
1071                         }
1072                         use_ff_fd = 1;
1073                 }
1074         }
1075
1076         while (1) {
1077                 char fname2[MAXPATHLEN];
1078                 char *fname = fname2;
1079
1080                 if (use_ff_fd) {
1081                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1082                                 break;
1083                         sanitize_path(fname, fname, "", 0);
1084                 } else {
1085                         if (argc-- == 0)
1086                                 break;
1087                         strlcpy(fname, *argv++, MAXPATHLEN);
1088                         if (sanitize_paths)
1089                                 sanitize_path(fname, fname, "", 0);
1090                 }
1091
1092                 l = strlen(fname);
1093                 if (fname[l - 1] == '/') {
1094                         if (l == 2 && fname[0] == '.') {
1095                                 /* Turn "./" into just "." rather than "./." */
1096                                 fname[1] = '\0';
1097                         } else if (l < MAXPATHLEN) {
1098                                 fname[l++] = '.';
1099                                 fname[l] = '\0';
1100                         }
1101                 }
1102
1103                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1104                         if (f != -1) {
1105                                 io_error |= IOERR_GENERAL;
1106                                 rsyserr(FERROR, errno, "link_stat %s failed",
1107                                         full_fname(fname));
1108                         }
1109                         continue;
1110                 }
1111
1112                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1113                         rprintf(FINFO, "skipping directory %s\n", fname);
1114                         continue;
1115                 }
1116
1117                 dir = NULL;
1118                 olddir[0] = '\0';
1119
1120                 if (!relative_paths) {
1121                         p = strrchr(fname, '/');
1122                         if (p) {
1123                                 *p = 0;
1124                                 if (p == fname)
1125                                         dir = "/";
1126                                 else
1127                                         dir = fname;
1128                                 fname = p + 1;
1129                         }
1130                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1131                         /* this ensures we send the intermediate directories,
1132                            thus getting their permissions right */
1133                         char *lp = lastpath, *fn = fname, *slash = fname;
1134                         *p = 0;
1135                         /* Skip any initial directories in our path that we
1136                          * have in common with lastpath. */
1137                         while (*fn && *lp == *fn) {
1138                                 if (*fn == '/')
1139                                         slash = fn;
1140                                 lp++, fn++;
1141                         }
1142                         *p = '/';
1143                         if (fn != p || (*lp && *lp != '/')) {
1144                                 int copy_links_saved = copy_links;
1145                                 int recurse_saved = recurse;
1146                                 copy_links = copy_unsafe_links;
1147                                 /* set recurse to 1 to prevent make_file
1148                                  * from ignoring directory, but still
1149                                  * turn off the recursive parameter to
1150                                  * send_file_name */
1151                                 recurse = 1;
1152                                 while ((slash = strchr(slash+1, '/')) != 0) {
1153                                         *slash = 0;
1154                                         send_file_name(f, flist, fname, 0, 0);
1155                                         *slash = '/';
1156                                 }
1157                                 copy_links = copy_links_saved;
1158                                 recurse = recurse_saved;
1159                                 *p = 0;
1160                                 strlcpy(lastpath, fname, sizeof lastpath);
1161                                 *p = '/';
1162                         }
1163                 }
1164
1165                 if (!*fname)
1166                         fname = ".";
1167
1168                 if (dir && *dir) {
1169                         static char *lastdir;
1170                         static int lastdir_len;
1171
1172                         strcpy(olddir, curr_dir); /* can't overflow */
1173
1174                         if (!push_dir(dir)) {
1175                                 io_error |= IOERR_GENERAL;
1176                                 rsyserr(FERROR, errno, "push_dir %s failed",
1177                                         full_fname(dir));
1178                                 continue;
1179                         }
1180
1181                         if (lastdir && strcmp(lastdir, dir) == 0) {
1182                                 flist_dir = lastdir;
1183                                 flist_dir_len = lastdir_len;
1184                         } else {
1185                                 flist_dir = lastdir = strdup(dir);
1186                                 flist_dir_len = lastdir_len = strlen(dir);
1187                         }
1188                 }
1189
1190                 if (one_file_system)
1191                         set_filesystem(fname);
1192
1193                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1194
1195                 if (olddir[0]) {
1196                         flist_dir = NULL;
1197                         flist_dir_len = 0;
1198                         if (!pop_dir(olddir)) {
1199                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1200                                         full_fname(dir));
1201                                 exit_cleanup(RERR_FILESELECT);
1202                         }
1203                 }
1204         }
1205
1206         if (f != -1) {
1207                 send_file_entry(NULL, f, 0);
1208
1209                 if (show_filelist_p())
1210                         finish_filelist_progress(flist);
1211         }
1212
1213         if (flist->hlink_pool) {
1214                 pool_destroy(flist->hlink_pool);
1215                 flist->hlink_pool = NULL;
1216         }
1217
1218         clean_flist(flist, 0, 0);
1219
1220         if (f != -1) {
1221                 /* Now send the uid/gid list. This was introduced in
1222                  * protocol version 15 */
1223                 send_uid_list(f);
1224
1225                 /* send the io_error flag */
1226                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1227
1228                 io_end_buffering();
1229                 stats.flist_size = stats.total_written - start_write;
1230                 stats.num_files = flist->count;
1231         }
1232
1233         if (verbose > 3)
1234                 output_flist(flist);
1235
1236         if (verbose > 2)
1237                 rprintf(FINFO, "send_file_list done\n");
1238
1239         return flist;
1240 }
1241
1242
1243 struct file_list *recv_file_list(int f)
1244 {
1245         struct file_list *flist;
1246         unsigned short flags;
1247         int64 start_read;
1248
1249         if (show_filelist_p())
1250                 start_filelist_progress("receiving file list");
1251
1252         start_read = stats.total_read;
1253
1254         flist = flist_new(WITH_HLINK, "recv_file_list");
1255
1256         flist->count = 0;
1257         flist->malloced = 1000;
1258         flist->files = new_array(struct file_struct *, flist->malloced);
1259         if (!flist->files)
1260                 goto oom;
1261
1262
1263         while ((flags = read_byte(f)) != 0) {
1264                 int i = flist->count;
1265
1266                 flist_expand(flist);
1267
1268                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1269                         flags |= read_byte(f) << 8;
1270                 receive_file_entry(&flist->files[i], flags, flist, f);
1271
1272                 if (S_ISREG(flist->files[i]->mode))
1273                         stats.total_size += flist->files[i]->length;
1274
1275                 flist->count++;
1276
1277                 maybe_emit_filelist_progress(flist);
1278
1279                 if (verbose > 2) {
1280                         rprintf(FINFO, "recv_file_name(%s)\n",
1281                                 f_name(flist->files[i]));
1282                 }
1283         }
1284         receive_file_entry(NULL, 0, NULL, 0); /* Signal that we're done. */
1285
1286         if (verbose > 2)
1287                 rprintf(FINFO, "received %d names\n", flist->count);
1288
1289         if (show_filelist_p())
1290                 finish_filelist_progress(flist);
1291
1292         clean_flist(flist, relative_paths, 1);
1293
1294         if (f != -1) {
1295                 /* Now send the uid/gid list. This was introduced in
1296                  * protocol version 15 */
1297                 recv_uid_list(f, flist);
1298
1299                 /* Recv the io_error flag */
1300                 if (lp_ignore_errors(module_id) || ignore_errors)
1301                         read_int(f);
1302                 else
1303                         io_error |= read_int(f);
1304         }
1305
1306         if (verbose > 3)
1307                 output_flist(flist);
1308
1309         if (list_only) {
1310                 int i;
1311                 for (i = 0; i < flist->count; i++)
1312                         list_file_entry(flist->files[i]);
1313         }
1314
1315         if (verbose > 2)
1316                 rprintf(FINFO, "recv_file_list done\n");
1317
1318         stats.flist_size = stats.total_read - start_read;
1319         stats.num_files = flist->count;
1320
1321         return flist;
1322
1323 oom:
1324         out_of_memory("recv_file_list");
1325         return NULL;            /* not reached */
1326 }
1327
1328
1329 int file_compare(struct file_struct **file1, struct file_struct **file2)
1330 {
1331         struct file_struct *f1 = *file1;
1332         struct file_struct *f2 = *file2;
1333
1334         if (!f1->basename && !f2->basename)
1335                 return 0;
1336         if (!f1->basename)
1337                 return -1;
1338         if (!f2->basename)
1339                 return 1;
1340         if (f1->dirname == f2->dirname)
1341                 return u_strcmp(f1->basename, f2->basename);
1342         return f_name_cmp(f1, f2);
1343 }
1344
1345
1346 int flist_find(struct file_list *flist, struct file_struct *f)
1347 {
1348         int low = 0, high = flist->count - 1;
1349
1350         while (high >= 0 && !flist->files[high]->basename) high--;
1351
1352         if (high < 0)
1353                 return -1;
1354
1355         while (low != high) {
1356                 int mid = (low + high) / 2;
1357                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1358                 if (ret == 0)
1359                         return flist_up(flist, mid);
1360                 if (ret > 0)
1361                         high = mid;
1362                 else
1363                         low = mid + 1;
1364         }
1365
1366         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1367                 return flist_up(flist, low);
1368         return -1;
1369 }
1370
1371 /*
1372  * Free up any resources a file_struct has allocated
1373  * and clear the file.
1374  */
1375 void clear_file(int i, struct file_list *flist)
1376 {
1377         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1378                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1379         memset(flist->files[i], 0, file_struct_len);
1380 }
1381
1382
1383 /*
1384  * allocate a new file list
1385  */
1386 struct file_list *flist_new(int with_hlink, char *msg)
1387 {
1388         struct file_list *flist;
1389
1390         flist = new(struct file_list);
1391         if (!flist)
1392                 out_of_memory(msg);
1393
1394         memset(flist, 0, sizeof (struct file_list));
1395
1396         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1397             out_of_memory, POOL_INTERN)))
1398                 out_of_memory(msg);
1399
1400 #if SUPPORT_HARD_LINKS
1401         if (with_hlink && preserve_hard_links) {
1402                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1403                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1404                         out_of_memory(msg);
1405         }
1406 #endif
1407
1408         return flist;
1409 }
1410
1411 /*
1412  * free up all elements in a flist
1413  */
1414 void flist_free(struct file_list *flist)
1415 {
1416         pool_destroy(flist->file_pool);
1417         pool_destroy(flist->hlink_pool);
1418         free(flist->files);
1419         free(flist);
1420 }
1421
1422
1423 /*
1424  * This routine ensures we don't have any duplicate names in our file list.
1425  * duplicate names can cause corruption because of the pipelining
1426  */
1427 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1428 {
1429         int i, prev_i = 0;
1430
1431         if (!flist || flist->count == 0)
1432                 return;
1433
1434         qsort(flist->files, flist->count,
1435             sizeof flist->files[0], (int (*)())file_compare);
1436
1437         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1438                 if (flist->files[i]->basename) {
1439                         prev_i = i;
1440                         break;
1441                 }
1442         }
1443         while (++i < flist->count) {
1444                 if (!flist->files[i]->basename)
1445                         continue;
1446                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1447                         if (verbose > 1 && !am_server) {
1448                                 rprintf(FINFO,
1449                                         "removing duplicate name %s from file list %d\n",
1450                                         f_name(flist->files[i]), i);
1451                         }
1452                         /* Make sure that if we unduplicate '.', that we don't
1453                          * lose track of a user-specified starting point (or
1454                          * else deletions will mysteriously fail with -R). */
1455                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1456                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1457
1458                         clear_file(i, flist);
1459                 } else
1460                         prev_i = i;
1461         }
1462
1463         if (strip_root) {
1464                 /* we need to strip off the root directory in the case
1465                    of relative paths, but this must be done _after_
1466                    the sorting phase */
1467                 for (i = 0; i < flist->count; i++) {
1468                         if (flist->files[i]->dirname &&
1469                             flist->files[i]->dirname[0] == '/') {
1470                                 memmove(&flist->files[i]->dirname[0],
1471                                         &flist->files[i]->dirname[1],
1472                                         strlen(flist->files[i]->dirname));
1473                         }
1474
1475                         if (flist->files[i]->dirname &&
1476                             !flist->files[i]->dirname[0]) {
1477                                 flist->files[i]->dirname = NULL;
1478                         }
1479                 }
1480         }
1481 }
1482
1483 static void output_flist(struct file_list *flist)
1484 {
1485         char uidbuf[16], gidbuf[16];
1486         struct file_struct *file;
1487         int i;
1488
1489         for (i = 0; i < flist->count; i++) {
1490                 file = flist->files[i];
1491                 if ((am_root || am_sender) && preserve_uid)
1492                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1493                 else
1494                         *uidbuf = '\0';
1495                 if (preserve_gid && file->gid != GID_NONE)
1496                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1497                 else
1498                         *gidbuf = '\0';
1499                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1500                         who_am_i(), i, NS(file->basedir), NS(file->dirname),
1501                         NS(file->basename), (int)file->mode,
1502                         (double)file->length, uidbuf, gidbuf);
1503         }
1504 }
1505
1506
1507 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1508
1509 /* Compare the names of two file_struct entities, just like strcmp()
1510  * would do if it were operating on the joined strings.  We assume
1511  * that there are no 0-length strings.
1512  */
1513 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1514 {
1515         int dif;
1516         const uchar *c1, *c2;
1517         enum fnc_state state1, state2;
1518
1519         if (!f1 || !f1->basename) {
1520                 if (!f2 || !f2->basename)
1521                         return 0;
1522                 return -1;
1523         }
1524         if (!f2 || !f2->basename)
1525                 return 1;
1526
1527         if (!(c1 = (uchar*)f1->dirname)) {
1528                 state1 = fnc_BASE;
1529                 c1 = (uchar*)f1->basename;
1530         } else if (!*c1) {
1531                 state1 = fnc_SLASH;
1532                 c1 = (uchar*)"/";
1533         } else
1534                 state1 = fnc_DIR;
1535         if (!(c2 = (uchar*)f2->dirname)) {
1536                 state2 = fnc_BASE;
1537                 c2 = (uchar*)f2->basename;
1538         } else if (!*c2) {
1539                 state2 = fnc_SLASH;
1540                 c2 = (uchar*)"/";
1541         } else
1542                 state2 = fnc_DIR;
1543
1544         while (1) {
1545                 if ((dif = (int)*c1 - (int)*c2) != 0)
1546                         break;
1547                 if (!*++c1) {
1548                         switch (state1) {
1549                         case fnc_DIR:
1550                                 state1 = fnc_SLASH;
1551                                 c1 = (uchar*)"/";
1552                                 break;
1553                         case fnc_SLASH:
1554                                 state1 = fnc_BASE;
1555                                 c1 = (uchar*)f1->basename;
1556                                 break;
1557                         case fnc_BASE:
1558                                 break;
1559                         }
1560                 }
1561                 if (!*++c2) {
1562                         switch (state2) {
1563                         case fnc_DIR:
1564                                 state2 = fnc_SLASH;
1565                                 c2 = (uchar*)"/";
1566                                 break;
1567                         case fnc_SLASH:
1568                                 state2 = fnc_BASE;
1569                                 c2 = (uchar*)f2->basename;
1570                                 break;
1571                         case fnc_BASE:
1572                                 if (!*c1)
1573                                         return 0;
1574                                 break;
1575                         }
1576                 }
1577         }
1578
1579         return dif;
1580 }
1581
1582
1583 /* Return a copy of the full filename of a flist entry, using the indicated
1584  * buffer.  No size-checking is done because we checked the size when creating
1585  * the file_struct entry.
1586  */
1587 char *f_name_to(struct file_struct *f, char *fbuf)
1588 {
1589         if (!f || !f->basename)
1590                 return NULL;
1591
1592         if (f->dirname) {
1593                 int len = strlen(f->dirname);
1594                 memcpy(fbuf, f->dirname, len);
1595                 fbuf[len] = '/';
1596                 strcpy(fbuf + len + 1, f->basename);
1597         } else
1598                 strcpy(fbuf, f->basename);
1599         return fbuf;
1600 }
1601
1602
1603 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1604  */
1605 char *f_name(struct file_struct *f)
1606 {
1607         static char names[5][MAXPATHLEN];
1608         static unsigned int n;
1609
1610         n = (n + 1) % (sizeof names / sizeof names[0]);
1611
1612         return f_name_to(f, names[n]);
1613 }