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