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