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