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_depth, 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, 0);
 574
 575         if (sanitize_paths)
 576                 sanitize_path(thisname, thisname, "", 0);
 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                 if (sanitize_paths)
 660                         lastdir_depth = count_dir_elements(lastdir);
 661         } else if (dirname)
 662                 file->dirname = dirname;
 663
 664         file->basename = bp;
 665         memcpy(bp, basename, basename_len);
 666         bp += basename_len;
 667
 668         if (preserve_devices && IS_DEVICE(mode))
 669                 file->u.rdev = rdev;
 670
 671 #if SUPPORT_LINKS
 672         if (linkname_len) {
 673                 file->u.link = bp;
 674                 read_sbuf(f, bp, linkname_len - 1);
 675                 if (sanitize_paths)
 676                         sanitize_path(bp, bp, "", lastdir_depth);
 677                 bp += linkname_len;
 678         }
 679 #endif
 680
 681 #if SUPPORT_HARD_LINKS
 682         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 683                 flags |= XMIT_HAS_IDEV_DATA;
 684         if (flags & XMIT_HAS_IDEV_DATA) {
 685                 uint64 inode;
 686                 if (protocol_version < 26) {
 687                         dev = read_int(f);
 688                         inode = read_int(f);
 689                 } else {
 690                         if (!(flags & XMIT_SAME_DEV))
 691                                 dev = read_longint(f);
 692                         inode = read_longint(f);
 693                 }
 694                 if (flist->hlink_pool) {
 695                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 696                             struct idev, 1, "inode_table");
 697                         file->F_INODE = inode;
 698                         file->F_DEV = dev;
 699                 }
 700         }
 701 #endif
 702
 703         if (always_checksum) {
 704                 char *sum;
 705                 if (sum_len) {
 706                         file->u.sum = sum = bp;
 707                         /*bp += sum_len;*/
 708                 } else if (protocol_version < 28) {
 709                         /* Prior to 28, we get a useless set of nulls. */
 710                         sum = empty_sum;
 711                 } else
 712                         sum = NULL;
 713                 if (sum) {
 714                         read_buf(f, sum,
 715                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 716                 }
 717         }
 718
 719         if (!preserve_perms) {
 720                 /* set an appropriate set of permissions based on original
 721                  * permissions and umask. This emulates what GNU cp does */
 722                 file->mode &= ~orig_umask;
 723         }
 724 }
 725
 726
 727 /**
 728  * Create a file_struct for a named file by reading its stat()
 729  * information and performing extensive checks against global
 730  * options.
 731  *
 732  * @return the new file, or NULL if there was an error or this file
 733  * should be excluded.
 734  *
 735  * @todo There is a small optimization opportunity here to avoid
 736  * stat()ing the file in some circumstances, which has a certain cost.
 737  * We are called immediately after doing readdir(), and so we may
 738  * already know the d_type of the file.  We could for example avoid
 739  * statting directories if we're not recursing, but this is not a very
 740  * important case.  Some systems may not have d_type.
 741  **/
 742 struct file_struct *make_file(char *fname, struct file_list *flist,
 743                               int exclude_level)
 744 {
 745         static char *lastdir;
 746         static int lastdir_len = -1;
 747         struct file_struct *file;
 748         STRUCT_STAT st;
 749         char sum[SUM_LENGTH];
 750         char thisname[MAXPATHLEN];
 751         char linkname[MAXPATHLEN];
 752         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 753         char *basename, *dirname, *bp;
 754         unsigned short flags = 0;
 755
 756         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 757                 lastdir_len = -1;
 758
 759         if (strlcpy(thisname, fname, sizeof thisname)
 760             >= sizeof thisname - flist_dir_len) {
 761                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 762                 return NULL;
 763         }
 764         clean_fname(thisname, 0);
 765         if (sanitize_paths)
 766                 sanitize_path(thisname, thisname, "", 0);
 767
 768         memset(sum, 0, SUM_LENGTH);
 769
 770         if (readlink_stat(thisname, &st, linkname) != 0) {
 771                 int save_errno = errno;
 772                 /* See if file is excluded before reporting an error. */
 773                 if (exclude_level != NO_EXCLUDES
 774                     && check_exclude_file(thisname, 0, exclude_level))
 775                         return NULL;
 776                 if (save_errno == ENOENT) {
 777 #if SUPPORT_LINKS
 778                         /* Avoid "vanished" error if symlink points nowhere. */
 779                         if (copy_links && do_lstat(thisname, &st) == 0
 780                             && S_ISLNK(st.st_mode)) {
 781                                 io_error |= IOERR_GENERAL;
 782                                 rprintf(FERROR, "symlink has no referent: %s\n",
 783                                         full_fname(thisname));
 784                         } else
 785 #endif
 786                         {
 787                                 enum logcode c = am_daemon && protocol_version < 28
 788                                     ? FERROR : FINFO;
 789                                 io_error |= IOERR_VANISHED;
 790                                 rprintf(c, "file has vanished: %s\n",
 791                                         full_fname(thisname));
 792                         }
 793                 } else {
 794                         io_error |= IOERR_GENERAL;
 795                         rsyserr(FERROR, save_errno, "readlink %s failed",
 796                                 full_fname(thisname));
 797                 }
 798                 return NULL;
 799         }
 800
 801         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 802         if (exclude_level == NO_EXCLUDES)
 803                 goto skip_excludes;
 804
 805         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 806                 rprintf(FINFO, "skipping directory %s\n", thisname);
 807                 return NULL;
 808         }
 809
 810         /* We only care about directories because we need to avoid recursing
 811          * into a mount-point directory, not to avoid copying a symlinked
 812          * file if -L (or similar) was specified. */
 813         if (one_file_system && st.st_dev != filesystem_dev
 814             && S_ISDIR(st.st_mode))
 815                 flags |= FLAG_MOUNT_POINT;
 816
 817         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
 818                 return NULL;
 819
 820         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
 821                 return NULL;
 822
 823 skip_excludes:
 824
 825         if (verbose > 2) {
 826                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 827                         who_am_i(), thisname, exclude_level);
 828         }
 829
 830         if ((basename = strrchr(thisname, '/')) != NULL) {
 831                 dirname_len = ++basename - thisname; /* counts future '\0' */
 832                 if (lastdir_len == dirname_len - 1
 833                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 834                         dirname = lastdir;
 835                         dirname_len = 0; /* indicates no copy is needed */
 836                 } else
 837                         dirname = thisname;
 838         } else {
 839                 basename = thisname;
 840                 dirname = NULL;
 841                 dirname_len = 0;
 842         }
 843         basename_len = strlen(basename) + 1; /* count the '\0' */
 844
 845 #if SUPPORT_LINKS
 846         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 847 #else
 848         linkname_len = 0;
 849 #endif
 850
 851         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 852
 853         alloc_len = file_struct_len + dirname_len + basename_len
 854             + linkname_len + sum_len;
 855         if (flist) {
 856                 bp = pool_alloc(flist->file_pool, alloc_len,
 857                     "receive_file_entry");
 858         } else {
 859                 if (!(bp = new_array(char, alloc_len)))
 860                         out_of_memory("receive_file_entry");
 861         }
 862
 863         file = (struct file_struct *)bp;
 864         memset(bp, 0, file_struct_len);
 865         bp += file_struct_len;
 866
 867         file->flags = flags;
 868         file->modtime = st.st_mtime;
 869         file->length = st.st_size;
 870         file->mode = st.st_mode;
 871         file->uid = st.st_uid;
 872         file->gid = st.st_gid;
 873
 874 #if SUPPORT_HARD_LINKS
 875         if (flist && flist->hlink_pool) {
 876                 if (protocol_version < 28) {
 877                         if (S_ISREG(st.st_mode))
 878                                 file->link_u.idev = pool_talloc(
 879                                     flist->hlink_pool, struct idev, 1,
 880                                     "inode_table");
 881                 } else {
 882                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 883                                 file->link_u.idev = pool_talloc(
 884                                     flist->hlink_pool, struct idev, 1,
 885                                     "inode_table");
 886                 }
 887         }
 888         if (file->link_u.idev) {
 889                 file->F_DEV = st.st_dev;
 890                 file->F_INODE = st.st_ino;
 891         }
 892 #endif
 893
 894         if (dirname_len) {
 895                 file->dirname = lastdir = bp;
 896                 lastdir_len = dirname_len - 1;
 897                 memcpy(bp, dirname, dirname_len - 1);
 898                 bp += dirname_len;
 899                 bp[-1] = '\0';
 900         } else if (dirname)
 901                 file->dirname = dirname;
 902
 903         file->basename = bp;
 904         memcpy(bp, basename, basename_len);
 905         bp += basename_len;
 906
 907 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 908         if (preserve_devices && IS_DEVICE(st.st_mode))
 909                 file->u.rdev = st.st_rdev;
 910 #endif
 911
 912 #if SUPPORT_LINKS
 913         if (linkname_len) {
 914                 file->u.link = bp;
 915                 memcpy(bp, linkname, linkname_len);
 916                 bp += linkname_len;
 917         }
 918 #endif
 919
 920         if (sum_len) {
 921                 file->u.sum = bp;
 922                 file_checksum(thisname, bp, st.st_size);
 923                 /*bp += sum_len;*/
 924         }
 925
 926         file->basedir = flist_dir;
 927
 928         if (!S_ISDIR(st.st_mode))
 929                 stats.total_size += st.st_size;
 930
 931         return file;
 932 }
 933
 934
 935 void send_file_name(int f, struct file_list *flist, char *fname,
 936                     int recursive, unsigned short base_flags)
 937 {
 938         struct file_struct *file;
 939         char fbuf[MAXPATHLEN];
 940
 941         /* f is set to -1 when calculating deletion file list */
 942         file = make_file(fname, flist,
 943             f == -1 && delete_excluded? SERVER_EXCLUDES : ALL_EXCLUDES);
 944
 945         if (!file)
 946                 return;
 947
 948         maybe_emit_filelist_progress(flist);
 949
 950         flist_expand(flist);
 951
 952         if (file->basename[0]) {
 953                 flist->files[flist->count++] = file;
 954                 send_file_entry(file, f, base_flags);
 955         }
 956
 957         if (recursive && S_ISDIR(file->mode)
 958             && !(file->flags & FLAG_MOUNT_POINT)) {
 959                 struct exclude_list_struct last_list = local_exclude_list;
 960                 local_exclude_list.head = local_exclude_list.tail = NULL;
 961                 send_directory(f, flist, f_name_to(file, fbuf));
 962                 if (verbose > 2) {
 963                         rprintf(FINFO, "[%s] popping %sexclude list\n",
 964                                 who_am_i(), local_exclude_list.debug_type);
 965                 }
 966                 clear_exclude_list(&local_exclude_list);
 967                 local_exclude_list = last_list;
 968         }
 969 }
 970
 971
 972 static void send_directory(int f, struct file_list *flist, char *dir)
 973 {
 974         DIR *d;
 975         struct dirent *di;
 976         char fname[MAXPATHLEN];
 977         unsigned int offset;
 978         char *p;
 979
 980         d = opendir(dir);
 981         if (!d) {
 982                 io_error |= IOERR_GENERAL;
 983                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(dir));
 984                 return;
 985         }
 986
 987         offset = strlcpy(fname, dir, MAXPATHLEN);
 988         p = fname + offset;
 989         if (offset >= MAXPATHLEN || p[-1] != '/') {
 990                 if (offset >= MAXPATHLEN - 1) {
 991                         io_error |= IOERR_GENERAL;
 992                         rprintf(FERROR, "skipping long-named directory: %s\n",
 993                                 full_fname(fname));
 994                         closedir(d);
 995                         return;
 996                 }
 997                 *p++ = '/';
 998                 offset++;
 999         }
1000
1001         if (cvs_exclude) {
1002                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
1003                     < MAXPATHLEN - offset) {
1004                         add_exclude_file(&local_exclude_list, fname,
1005                                          XFLG_WORD_SPLIT | XFLG_WORDS_ONLY);
1006                 } else {
1007                         io_error |= IOERR_GENERAL;
1008                         rprintf(FINFO,
1009                                 "cannot cvs-exclude in long-named directory %s\n",
1010                                 full_fname(fname));
1011                 }
1012         }
1013
1014         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1015                 char *dname = d_name(di);
1016                 if (dname[0] == '.' && (dname[1] == '\0'
1017                     || (dname[1] == '.' && dname[2] == '\0')))
1018                         continue;
1019                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
1020                         send_file_name(f, flist, fname, recurse, 0);
1021                 else {
1022                         io_error |= IOERR_GENERAL;
1023                         rprintf(FINFO,
1024                                 "cannot send long-named file %s\n",
1025                                 full_fname(fname));
1026                 }
1027         }
1028         if (errno) {
1029                 io_error |= IOERR_GENERAL;
1030                 rsyserr(FERROR, errno, "readdir(%s)", dir);
1031         }
1032
1033         closedir(d);
1034 }
1035
1036
1037 /**
1038  * This function is normally called by the sender, but the receiver also
1039  * uses it to construct its own file list if --delete has been specified.
1040  * The delete_files() function in receiver.c sets f to -1 so that we just
1041  * construct the file list in memory without sending it over the wire.  It
1042  * also has the side-effect of ignoring user-excludes if delete_excluded
1043  * is set (so that the delete list includes user-excluded files).
1044  **/
1045 struct file_list *send_file_list(int f, int argc, char *argv[])
1046 {
1047         int l;
1048         STRUCT_STAT st;
1049         char *p, *dir, olddir[sizeof curr_dir];
1050         char lastpath[MAXPATHLEN] = "";
1051         struct file_list *flist;
1052         int64 start_write;
1053         int use_ff_fd = 0;
1054
1055         if (show_filelist_p() && f != -1)
1056                 start_filelist_progress("building file list");
1057
1058         start_write = stats.total_written;
1059
1060         flist = flist_new(f == -1 ? WITHOUT_HLINK : WITH_HLINK,
1061             "send_file_list");
1062
1063         if (f != -1) {
1064                 io_start_buffering_out();
1065                 if (filesfrom_fd >= 0) {
1066                         if (argv[0] && !push_dir(argv[0])) {
1067                                 rsyserr(FERROR, errno, "push_dir %s failed",
1068                                         full_fname(argv[0]));
1069                                 exit_cleanup(RERR_FILESELECT);
1070                         }
1071                         use_ff_fd = 1;
1072                 }
1073         }
1074
1075         while (1) {
1076                 char fname2[MAXPATHLEN];
1077                 char *fname = fname2;
1078
1079                 if (use_ff_fd) {
1080                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1081                                 break;
1082                         sanitize_path(fname, fname, "", 0);
1083                 } else {
1084                         if (argc-- == 0)
1085                                 break;
1086                         strlcpy(fname, *argv++, MAXPATHLEN);
1087                         if (sanitize_paths)
1088                                 sanitize_path(fname, fname, "", 0);
1089                 }
1090
1091                 l = strlen(fname);
1092                 if (fname[l - 1] == '/') {
1093                         if (l == 2 && fname[0] == '.') {
1094                                 /* Turn "./" into just "." rather than "./." */
1095                                 fname[1] = '\0';
1096                         } else if (l < MAXPATHLEN) {
1097                                 fname[l++] = '.';
1098                                 fname[l] = '\0';
1099                         }
1100                 }
1101
1102                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1103                         if (f != -1) {
1104                                 io_error |= IOERR_GENERAL;
1105                                 rsyserr(FERROR, errno, "link_stat %s failed",
1106                                         full_fname(fname));
1107                         }
1108                         continue;
1109                 }
1110
1111                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1112                         rprintf(FINFO, "skipping directory %s\n", fname);
1113                         continue;
1114                 }
1115
1116                 dir = NULL;
1117                 olddir[0] = '\0';
1118
1119                 if (!relative_paths) {
1120                         p = strrchr(fname, '/');
1121                         if (p) {
1122                                 *p = 0;
1123                                 if (p == fname)
1124                                         dir = "/";
1125                                 else
1126                                         dir = fname;
1127                                 fname = p + 1;
1128                         }
1129                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1130                         /* this ensures we send the intermediate directories,
1131                            thus getting their permissions right */
1132                         char *lp = lastpath, *fn = fname, *slash = fname;
1133                         *p = 0;
1134                         /* Skip any initial directories in our path that we
1135                          * have in common with lastpath. */
1136                         while (*fn && *lp == *fn) {
1137                                 if (*fn == '/')
1138                                         slash = fn;
1139                                 lp++, fn++;
1140                         }
1141                         *p = '/';
1142                         if (fn != p || (*lp && *lp != '/')) {
1143                                 int copy_links_saved = copy_links;
1144                                 int recurse_saved = recurse;
1145                                 copy_links = copy_unsafe_links;
1146                                 /* set recurse to 1 to prevent make_file
1147                                  * from ignoring directory, but still
1148                                  * turn off the recursive parameter to
1149                                  * send_file_name */
1150                                 recurse = 1;
1151                                 while ((slash = strchr(slash+1, '/')) != 0) {
1152                                         *slash = 0;
1153                                         send_file_name(f, flist, fname, 0, 0);
1154                                         *slash = '/';
1155                                 }
1156                                 copy_links = copy_links_saved;
1157                                 recurse = recurse_saved;
1158                                 *p = 0;
1159                                 strlcpy(lastpath, fname, sizeof lastpath);
1160                                 *p = '/';
1161                         }
1162                 }
1163
1164                 if (!*fname)
1165                         fname = ".";
1166
1167                 if (dir && *dir) {
1168                         static char *lastdir;
1169                         static int lastdir_len;
1170
1171                         strcpy(olddir, curr_dir); /* can't overflow */
1172
1173                         if (!push_dir(dir)) {
1174                                 io_error |= IOERR_GENERAL;
1175                                 rsyserr(FERROR, errno, "push_dir %s failed",
1176                                         full_fname(dir));
1177                                 continue;
1178                         }
1179
1180                         if (lastdir && strcmp(lastdir, dir) == 0) {
1181                                 flist_dir = lastdir;
1182                                 flist_dir_len = lastdir_len;
1183                         } else {
1184                                 flist_dir = lastdir = strdup(dir);
1185                                 flist_dir_len = lastdir_len = strlen(dir);
1186                         }
1187                 }
1188
1189                 if (one_file_system)
1190                         set_filesystem(fname);
1191
1192                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1193
1194                 if (olddir[0]) {
1195                         flist_dir = NULL;
1196                         flist_dir_len = 0;
1197                         if (!pop_dir(olddir)) {
1198                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1199                                         full_fname(dir));
1200                                 exit_cleanup(RERR_FILESELECT);
1201                         }
1202                 }
1203         }
1204
1205         if (f != -1) {
1206                 send_file_entry(NULL, f, 0);
1207
1208                 if (show_filelist_p())
1209                         finish_filelist_progress(flist);
1210         }
1211
1212         if (flist->hlink_pool) {
1213                 pool_destroy(flist->hlink_pool);
1214                 flist->hlink_pool = NULL;
1215         }
1216
1217         clean_flist(flist, 0, 0);
1218
1219         if (f != -1) {
1220                 /* Now send the uid/gid list. This was introduced in
1221                  * protocol version 15 */
1222                 send_uid_list(f);
1223
1224                 /* send the io_error flag */
1225                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1226
1227                 io_end_buffering();
1228                 stats.flist_size = stats.total_written - start_write;
1229                 stats.num_files = flist->count;
1230         }
1231
1232         if (verbose > 3)
1233                 output_flist(flist);
1234
1235         if (verbose > 2)
1236                 rprintf(FINFO, "send_file_list done\n");
1237
1238         return flist;
1239 }
1240
1241
1242 struct file_list *recv_file_list(int f)
1243 {
1244         struct file_list *flist;
1245         unsigned short flags;
1246         int64 start_read;
1247
1248         if (show_filelist_p())
1249                 start_filelist_progress("receiving file list");
1250
1251         start_read = stats.total_read;
1252
1253         flist = flist_new(WITH_HLINK, "recv_file_list");
1254
1255         flist->count = 0;
1256         flist->malloced = 1000;
1257         flist->files = new_array(struct file_struct *, flist->malloced);
1258         if (!flist->files)
1259                 goto oom;
1260
1261
1262         while ((flags = read_byte(f)) != 0) {
1263                 int i = flist->count;
1264
1265                 flist_expand(flist);
1266
1267                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1268                         flags |= read_byte(f) << 8;
1269                 receive_file_entry(&flist->files[i], flags, flist, f);
1270
1271                 if (S_ISREG(flist->files[i]->mode))
1272                         stats.total_size += flist->files[i]->length;
1273
1274                 flist->count++;
1275
1276                 maybe_emit_filelist_progress(flist);
1277
1278                 if (verbose > 2) {
1279                         rprintf(FINFO, "recv_file_name(%s)\n",
1280                                 f_name(flist->files[i]));
1281                 }
1282         }
1283         receive_file_entry(NULL, 0, NULL, 0); /* Signal that we're done. */
1284
1285         if (verbose > 2)
1286                 rprintf(FINFO, "received %d names\n", flist->count);
1287
1288         if (show_filelist_p())
1289                 finish_filelist_progress(flist);
1290
1291         clean_flist(flist, relative_paths, 1);
1292
1293         if (f != -1) {
1294                 /* Now send the uid/gid list. This was introduced in
1295                  * protocol version 15 */
1296                 recv_uid_list(f, flist);
1297
1298                 /* Recv the io_error flag */
1299                 if (lp_ignore_errors(module_id) || ignore_errors)
1300                         read_int(f);
1301                 else
1302                         io_error |= read_int(f);
1303         }
1304
1305         if (verbose > 3)
1306                 output_flist(flist);
1307
1308         if (list_only) {
1309                 int i;
1310                 for (i = 0; i < flist->count; i++)
1311                         list_file_entry(flist->files[i]);
1312         }
1313
1314         if (verbose > 2)
1315                 rprintf(FINFO, "recv_file_list done\n");
1316
1317         stats.flist_size = stats.total_read - start_read;
1318         stats.num_files = flist->count;
1319
1320         return flist;
1321
1322 oom:
1323         out_of_memory("recv_file_list");
1324         return NULL;            /* not reached */
1325 }
1326
1327
1328 int file_compare(struct file_struct **file1, struct file_struct **file2)
1329 {
1330         struct file_struct *f1 = *file1;
1331         struct file_struct *f2 = *file2;
1332
1333         if (!f1->basename && !f2->basename)
1334                 return 0;
1335         if (!f1->basename)
1336                 return -1;
1337         if (!f2->basename)
1338                 return 1;
1339         if (f1->dirname == f2->dirname)
1340                 return u_strcmp(f1->basename, f2->basename);
1341         return f_name_cmp(f1, f2);
1342 }
1343
1344
1345 int flist_find(struct file_list *flist, struct file_struct *f)
1346 {
1347         int low = 0, high = flist->count - 1;
1348
1349         while (high >= 0 && !flist->files[high]->basename) high--;
1350
1351         if (high < 0)
1352                 return -1;
1353
1354         while (low != high) {
1355                 int mid = (low + high) / 2;
1356                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1357                 if (ret == 0)
1358                         return flist_up(flist, mid);
1359                 if (ret > 0)
1360                         high = mid;
1361                 else
1362                         low = mid + 1;
1363         }
1364
1365         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1366                 return flist_up(flist, low);
1367         return -1;
1368 }
1369
1370 /*
1371  * Free up any resources a file_struct has allocated
1372  * and clear the file.
1373  */
1374 void clear_file(int i, struct file_list *flist)
1375 {
1376         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1377                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1378         memset(flist->files[i], 0, file_struct_len);
1379 }
1380
1381
1382 /*
1383  * allocate a new file list
1384  */
1385 struct file_list *flist_new(int with_hlink, char *msg)
1386 {
1387         struct file_list *flist;
1388
1389         flist = new(struct file_list);
1390         if (!flist)
1391                 out_of_memory(msg);
1392
1393         memset(flist, 0, sizeof (struct file_list));
1394
1395         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1396             out_of_memory, POOL_INTERN)))
1397                 out_of_memory(msg);
1398
1399 #if SUPPORT_HARD_LINKS
1400         if (with_hlink && preserve_hard_links) {
1401                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1402                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1403                         out_of_memory(msg);
1404         }
1405 #endif
1406
1407         return flist;
1408 }
1409
1410 /*
1411  * free up all elements in a flist
1412  */
1413 void flist_free(struct file_list *flist)
1414 {
1415         pool_destroy(flist->file_pool);
1416         pool_destroy(flist->hlink_pool);
1417         free(flist->files);
1418         free(flist);
1419 }
1420
1421
1422 /*
1423  * This routine ensures we don't have any duplicate names in our file list.
1424  * duplicate names can cause corruption because of the pipelining
1425  */
1426 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1427 {
1428         int i, prev_i = 0;
1429
1430         if (!flist || flist->count == 0)
1431                 return;
1432
1433         qsort(flist->files, flist->count,
1434             sizeof flist->files[0], (int (*)())file_compare);
1435
1436         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1437                 if (flist->files[i]->basename) {
1438                         prev_i = i;
1439                         break;
1440                 }
1441         }
1442         while (++i < flist->count) {
1443                 if (!flist->files[i]->basename)
1444                         continue;
1445                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1446                         if (verbose > 1 && !am_server) {
1447                                 rprintf(FINFO,
1448                                         "removing duplicate name %s from file list %d\n",
1449                                         f_name(flist->files[i]), i);
1450                         }
1451                         /* Make sure that if we unduplicate '.', that we don't
1452                          * lose track of a user-specified starting point (or
1453                          * else deletions will mysteriously fail with -R). */
1454                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1455                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1456
1457                         clear_file(i, flist);
1458                 } else
1459                         prev_i = i;
1460         }
1461
1462         if (strip_root) {
1463                 /* we need to strip off the root directory in the case
1464                    of relative paths, but this must be done _after_
1465                    the sorting phase */
1466                 for (i = 0; i < flist->count; i++) {
1467                         if (flist->files[i]->dirname &&
1468                             flist->files[i]->dirname[0] == '/') {
1469                                 memmove(&flist->files[i]->dirname[0],
1470                                         &flist->files[i]->dirname[1],
1471                                         strlen(flist->files[i]->dirname));
1472                         }
1473
1474                         if (flist->files[i]->dirname &&
1475                             !flist->files[i]->dirname[0]) {
1476                                 flist->files[i]->dirname = NULL;
1477                         }
1478                 }
1479         }
1480 }
1481
1482 static void output_flist(struct file_list *flist)
1483 {
1484         char uidbuf[16], gidbuf[16];
1485         struct file_struct *file;
1486         int i;
1487
1488         for (i = 0; i < flist->count; i++) {
1489                 file = flist->files[i];
1490                 if (am_root && preserve_uid)
1491                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1492                 else
1493                         *uidbuf = '\0';
1494                 if (preserve_gid && file->gid != GID_NONE)
1495                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1496                 else
1497                         *gidbuf = '\0';
1498                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1499                         who_am_i(), i, NS(file->basedir), NS(file->dirname),
1500                         NS(file->basename), (int)file->mode,
1501                         (double)file->length, uidbuf, gidbuf);
1502         }
1503 }
1504
1505
1506 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1507
1508 /* Compare the names of two file_struct entities, just like strcmp()
1509  * would do if it were operating on the joined strings.  We assume
1510  * that there are no 0-length strings.
1511  */
1512 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1513 {
1514         int dif;
1515         const uchar *c1, *c2;
1516         enum fnc_state state1, state2;
1517
1518         if (!f1 || !f1->basename) {
1519                 if (!f2 || !f2->basename)
1520                         return 0;
1521                 return -1;
1522         }
1523         if (!f2 || !f2->basename)
1524                 return 1;
1525
1526         if (!(c1 = (uchar*)f1->dirname)) {
1527                 state1 = fnc_BASE;
1528                 c1 = (uchar*)f1->basename;
1529         } else if (!*c1) {
1530                 state1 = fnc_SLASH;
1531                 c1 = (uchar*)"/";
1532         } else
1533                 state1 = fnc_DIR;
1534         if (!(c2 = (uchar*)f2->dirname)) {
1535                 state2 = fnc_BASE;
1536                 c2 = (uchar*)f2->basename;
1537         } else if (!*c2) {
1538                 state2 = fnc_SLASH;
1539                 c2 = (uchar*)"/";
1540         } else
1541                 state2 = fnc_DIR;
1542
1543         while (1) {
1544                 if ((dif = (int)*c1 - (int)*c2) != 0)
1545                         break;
1546                 if (!*++c1) {
1547                         switch (state1) {
1548                         case fnc_DIR:
1549                                 state1 = fnc_SLASH;
1550                                 c1 = (uchar*)"/";
1551                                 break;
1552                         case fnc_SLASH:
1553                                 state1 = fnc_BASE;
1554                                 c1 = (uchar*)f1->basename;
1555                                 break;
1556                         case fnc_BASE:
1557                                 break;
1558                         }
1559                 }
1560                 if (!*++c2) {
1561                         switch (state2) {
1562                         case fnc_DIR:
1563                                 state2 = fnc_SLASH;
1564                                 c2 = (uchar*)"/";
1565                                 break;
1566                         case fnc_SLASH:
1567                                 state2 = fnc_BASE;
1568                                 c2 = (uchar*)f2->basename;
1569                                 break;
1570                         case fnc_BASE:
1571                                 if (!*c1)
1572                                         return 0;
1573                                 break;
1574                         }
1575                 }
1576         }
1577
1578         return dif;
1579 }
1580
1581
1582 /* Return a copy of the full filename of a flist entry, using the indicated
1583  * buffer.  No size-checking is done because we checked the size when creating
1584  * the file_struct entry.
1585  */
1586 char *f_name_to(struct file_struct *f, char *fbuf)
1587 {
1588         if (!f || !f->basename)
1589                 return NULL;
1590
1591         if (f->dirname) {
1592                 int len = strlen(f->dirname);
1593                 memcpy(fbuf, f->dirname, len);
1594                 fbuf[len] = '/';
1595                 strcpy(fbuf + len + 1, f->basename);
1596         } else
1597                 strcpy(fbuf, f->basename);
1598         return fbuf;
1599 }
1600
1601
1602 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1603  */
1604 char *f_name(struct file_struct *f)
1605 {
1606         static char names[5][MAXPATHLEN];
1607         static unsigned int n;
1608
1609         n = (n + 1) % (sizeof names / sizeof names[0]);
1610
1611         return f_name_to(f, names[n]);
1612 }