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 int verbose;
  31 extern int dry_run;
  32 extern int list_only;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_daemon;
  36 extern int am_sender;
  37 extern int do_progress;
  38 extern int always_checksum;
  39 extern int module_id;
  40 extern int ignore_errors;
  41 extern int numeric_ids;
  42 extern int recurse;
  43 extern int xfer_dirs;
  44 extern int filesfrom_fd;
  45 extern int one_file_system;
  46 extern int keep_dirlinks;
  47 extern int preserve_links;
  48 extern int preserve_hard_links;
  49 extern int preserve_perms;
  50 extern int preserve_devices;
  51 extern int preserve_uid;
  52 extern int preserve_gid;
  53 extern int relative_paths;
  54 extern int implied_dirs;
  55 extern int copy_links;
  56 extern int copy_unsafe_links;
  57 extern int protocol_version;
  58 extern int sanitize_paths;
  59 extern int orig_umask;
  60 extern struct stats stats;
  61 extern struct file_list *the_file_list;
  62
  63 extern char curr_dir[MAXPATHLEN];
  64
  65 extern struct filter_list_struct filter_list;
  66 extern struct filter_list_struct server_filter_list;
  67
  68 int io_error;
  69 dev_t filesystem_dev; /* used to implement -x */
  70
  71 static char empty_sum[MD4_SUM_LENGTH];
  72 static int flist_count_offset;
  73 static unsigned int file_struct_len;
  74 static struct file_list *sorting_flist;
  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 static int show_filelist_p(void)
  88 {
  89         return verbose && xfer_dirs && !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 static void emit_filelist_progress(int count)
 101 {
 102         rprintf(FINFO, " %d files...\r", count);
 103 }
 104
 105 static void maybe_emit_filelist_progress(int count)
 106 {
 107         if (do_progress && show_filelist_p() && (count % 100) == 0)
 108                 emit_filelist_progress(count);
 109 }
 110
 111 static void finish_filelist_progress(const struct file_list *flist)
 112 {
 113         if (do_progress) {
 114                 /* This overwrites the progress line */
 115                 rprintf(FINFO, "%d file%sto consider\n",
 116                         flist->count, flist->count == 1 ? " " : "s ");
 117         } else
 118                 rprintf(FINFO, "done\n");
 119 }
 120
 121 void show_flist_stats(void)
 122 {
 123         /* Nothing yet */
 124 }
 125
 126 static void list_file_entry(struct file_struct *f)
 127 {
 128         char perms[11];
 129
 130         if (!f->basename) {
 131                 /* this can happen if duplicate names were removed */
 132                 return;
 133         }
 134
 135         permstring(perms, f->mode);
 136
 137 #ifdef SUPPORT_LINKS
 138         if (preserve_links && S_ISLNK(f->mode)) {
 139                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 140                         perms,
 141                         (double)f->length, timestring(f->modtime),
 142                         safe_fname(f_name(f)), safe_fname(f->u.link));
 143         } else
 144 #endif
 145         {
 146                 rprintf(FINFO, "%s %11.0f %s %s\n",
 147                         perms,
 148                         (double)f->length, timestring(f->modtime),
 149                         safe_fname(f_name(f)));
 150         }
 151 }
 152
 153 /**
 154  * Stat either a symlink or its referent, depending on the settings of
 155  * copy_links, copy_unsafe_links, etc.
 156  *
 157  * @retval -1 on error
 158  *
 159  * @retval 0 for success
 160  *
 161  * @post If @p path is a symlink, then @p linkbuf (of size @c
 162  * MAXPATHLEN) contains the symlink target.
 163  *
 164  * @post @p buffer contains information about the link or the
 165  * referrent as appropriate, if they exist.
 166  **/
 167 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 168 {
 169 #ifdef SUPPORT_LINKS
 170         if (copy_links)
 171                 return do_stat(path, buffer);
 172         if (link_stat(path, buffer, 0) < 0)
 173                 return -1;
 174         if (S_ISLNK(buffer->st_mode)) {
 175                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 176                 if (l == -1)
 177                         return -1;
 178                 linkbuf[l] = 0;
 179                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 180                         if (verbose > 1) {
 181                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 182                                         safe_fname(path), safe_fname(linkbuf));
 183                         }
 184                         return do_stat(path, buffer);
 185                 }
 186         }
 187         return 0;
 188 #else
 189         return do_stat(path, buffer);
 190 #endif
 191 }
 192
 193 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 194 {
 195 #ifdef SUPPORT_LINKS
 196         if (copy_links)
 197                 return do_stat(path, buffer);
 198         if (do_lstat(path, buffer) < 0)
 199                 return -1;
 200         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 201                 STRUCT_STAT st;
 202                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 203                         *buffer = st;
 204         }
 205         return 0;
 206 #else
 207         return do_stat(path, buffer);
 208 #endif
 209 }
 210
 211 /* This function is used to check if a file should be included/excluded
 212  * from the list of files based on its name and type etc.  The value of
 213  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 214 static int is_excluded(char *fname, int is_dir, int filter_level)
 215 {
 216 #if 0 /* This currently never happens, so avoid a useless compare. */
 217         if (filter_level == NO_FILTERS)
 218                 return 0;
 219 #endif
 220         if (fname) {
 221                 /* never exclude '.', even if somebody does --exclude '*' */
 222                 if (fname[0] == '.' && !fname[1])
 223                         return 0;
 224                 /* Handle the -R version of the '.' dir. */
 225                 if (fname[0] == '/') {
 226                         int len = strlen(fname);
 227                         if (fname[len-1] == '.' && fname[len-2] == '/')
 228                                 return 0;
 229                 }
 230         }
 231         if (server_filter_list.head
 232             && check_filter(&server_filter_list, fname, is_dir) < 0)
 233                 return 1;
 234         if (filter_level != ALL_FILTERS)
 235                 return 0;
 236         if (filter_list.head
 237             && check_filter(&filter_list, fname, is_dir) < 0)
 238                 return 1;
 239         return 0;
 240 }
 241
 242 static int to_wire_mode(mode_t mode)
 243 {
 244 #ifdef SUPPORT_LINKS
 245         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 246                 return (mode & ~(_S_IFMT)) | 0120000;
 247 #endif
 248         return (int)mode;
 249 }
 250
 251 static mode_t from_wire_mode(int mode)
 252 {
 253         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 254                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 255         return (mode_t)mode;
 256 }
 257
 258 static void send_directory(int f, struct file_list *flist,
 259                            char *fbuf, int len);
 260
 261 static char *flist_dir;
 262 static int flist_dir_len;
 263
 264
 265 /**
 266  * Make sure @p flist is big enough to hold at least @p flist->count
 267  * entries.
 268  **/
 269 void flist_expand(struct file_list *flist)
 270 {
 271         struct file_struct **new_ptr;
 272
 273         if (flist->count < flist->malloced)
 274                 return;
 275
 276         if (flist->malloced < FLIST_START)
 277                 flist->malloced = FLIST_START;
 278         else if (flist->malloced >= FLIST_LINEAR)
 279                 flist->malloced += FLIST_LINEAR;
 280         else
 281                 flist->malloced *= 2;
 282
 283         /*
 284          * In case count jumped or we are starting the list
 285          * with a known size just set it.
 286          */
 287         if (flist->malloced < flist->count)
 288                 flist->malloced = flist->count;
 289
 290         new_ptr = realloc_array(flist->files, struct file_struct *,
 291                                 flist->malloced);
 292
 293         if (verbose >= 2 && flist->malloced != FLIST_START) {
 294                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 295                     who_am_i(),
 296                     (double)sizeof flist->files[0] * flist->malloced,
 297                     (new_ptr == flist->files) ? " not" : "");
 298         }
 299
 300         flist->files = new_ptr;
 301
 302         if (!flist->files)
 303                 out_of_memory("flist_expand");
 304 }
 305
 306 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 307 {
 308         unsigned short flags;
 309         static time_t modtime;
 310         static mode_t mode;
 311         static int64 dev;
 312         static dev_t rdev;
 313         static uint32 rdev_major;
 314         static uid_t uid;
 315         static gid_t gid;
 316         static char lastname[MAXPATHLEN];
 317         char fname[MAXPATHLEN];
 318         int l1, l2;
 319
 320         if (f < 0)
 321                 return;
 322
 323         if (!file) {
 324                 write_byte(f, 0);
 325                 modtime = 0, mode = 0;
 326                 dev = 0, rdev = makedev(0, 0);
 327                 rdev_major = 0;
 328                 uid = 0, gid = 0;
 329                 *lastname = '\0';
 330                 return;
 331         }
 332
 333         io_write_phase = "send_file_entry";
 334
 335         f_name_to(file, fname);
 336
 337         flags = base_flags;
 338
 339         if (file->mode == mode)
 340                 flags |= XMIT_SAME_MODE;
 341         else
 342                 mode = file->mode;
 343         if (preserve_devices) {
 344                 if (protocol_version < 28) {
 345                         if (IS_DEVICE(mode)) {
 346                                 if (file->u.rdev == rdev)
 347                                         flags |= XMIT_SAME_RDEV_pre28;
 348                                 else
 349                                         rdev = file->u.rdev;
 350                         } else
 351                                 rdev = makedev(0, 0);
 352                 } else if (IS_DEVICE(mode)) {
 353                         rdev = file->u.rdev;
 354                         if ((uint32)major(rdev) == rdev_major)
 355                                 flags |= XMIT_SAME_RDEV_MAJOR;
 356                         else
 357                                 rdev_major = major(rdev);
 358                         if ((uint32)minor(rdev) <= 0xFFu)
 359                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 360                 }
 361         }
 362         if (file->uid == uid)
 363                 flags |= XMIT_SAME_UID;
 364         else
 365                 uid = file->uid;
 366         if (file->gid == gid)
 367                 flags |= XMIT_SAME_GID;
 368         else
 369                 gid = file->gid;
 370         if (file->modtime == modtime)
 371                 flags |= XMIT_SAME_TIME;
 372         else
 373                 modtime = file->modtime;
 374
 375 #ifdef SUPPORT_HARD_LINKS
 376         if (file->link_u.idev) {
 377                 if (file->F_DEV == dev) {
 378                         if (protocol_version >= 28)
 379                                 flags |= XMIT_SAME_DEV;
 380                 } else
 381                         dev = file->F_DEV;
 382                 flags |= XMIT_HAS_IDEV_DATA;
 383         }
 384 #endif
 385
 386         for (l1 = 0;
 387             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 388             l1++) {}
 389         l2 = strlen(fname+l1);
 390
 391         if (l1 > 0)
 392                 flags |= XMIT_SAME_NAME;
 393         if (l2 > 255)
 394                 flags |= XMIT_LONG_NAME;
 395
 396         /* We must make sure we don't send a zero flag byte or the
 397          * other end will terminate the flist transfer.  Note that
 398          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 399          * it's harmless way to add a bit to the first flag byte. */
 400         if (protocol_version >= 28) {
 401                 if (!flags && !S_ISDIR(mode))
 402                         flags |= XMIT_TOP_DIR;
 403                 if ((flags & 0xFF00) || !flags) {
 404                         flags |= XMIT_EXTENDED_FLAGS;
 405                         write_byte(f, flags);
 406                         write_byte(f, flags >> 8);
 407                 } else
 408                         write_byte(f, flags);
 409         } else {
 410                 if (!(flags & 0xFF))
 411                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 412                 write_byte(f, flags);
 413         }
 414         if (flags & XMIT_SAME_NAME)
 415                 write_byte(f, l1);
 416         if (flags & XMIT_LONG_NAME)
 417                 write_int(f, l2);
 418         else
 419                 write_byte(f, l2);
 420         write_buf(f, fname + l1, l2);
 421
 422         write_longint(f, file->length);
 423         if (!(flags & XMIT_SAME_TIME))
 424                 write_int(f, modtime);
 425         if (!(flags & XMIT_SAME_MODE))
 426                 write_int(f, to_wire_mode(mode));
 427         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 428                 if (!numeric_ids)
 429                         add_uid(uid);
 430                 write_int(f, uid);
 431         }
 432         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 433                 if (!numeric_ids)
 434                         add_gid(gid);
 435                 write_int(f, gid);
 436         }
 437         if (preserve_devices && IS_DEVICE(mode)) {
 438                 if (protocol_version < 28) {
 439                         if (!(flags & XMIT_SAME_RDEV_pre28))
 440                                 write_int(f, (int)rdev);
 441                 } else {
 442                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 443                                 write_int(f, major(rdev));
 444                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 445                                 write_byte(f, minor(rdev));
 446                         else
 447                                 write_int(f, minor(rdev));
 448                 }
 449         }
 450
 451 #ifdef SUPPORT_LINKS
 452         if (preserve_links && S_ISLNK(mode)) {
 453                 int len = strlen(file->u.link);
 454                 write_int(f, len);
 455                 write_buf(f, file->u.link, len);
 456         }
 457 #endif
 458
 459 #ifdef SUPPORT_HARD_LINKS
 460         if (flags & XMIT_HAS_IDEV_DATA) {
 461                 if (protocol_version < 26) {
 462                         /* 32-bit dev_t and ino_t */
 463                         write_int(f, dev);
 464                         write_int(f, file->F_INODE);
 465                 } else {
 466                         /* 64-bit dev_t and ino_t */
 467                         if (!(flags & XMIT_SAME_DEV))
 468                                 write_longint(f, dev);
 469                         write_longint(f, file->F_INODE);
 470                 }
 471         }
 472 #endif
 473
 474         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 475                 char *sum;
 476                 int slen = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
 477                 if (S_ISREG(mode))
 478                         sum = file->u.sum;
 479                 else {
 480                         /* Prior to 28, we sent a useless set of nulls. */
 481                         sum = empty_sum;
 482                 }
 483                 write_buf(f, sum, slen);
 484         }
 485
 486         strlcpy(lastname, fname, MAXPATHLEN);
 487
 488         io_write_phase = "unknown";
 489 }
 490
 491 static struct file_struct *receive_file_entry(struct file_list *flist,
 492                                               unsigned short flags, int f)
 493 {
 494         static time_t modtime;
 495         static mode_t mode;
 496         static int64 dev;
 497         static dev_t rdev;
 498         static uint32 rdev_major;
 499         static uid_t uid;
 500         static gid_t gid;
 501         static char lastname[MAXPATHLEN], *lastdir;
 502         static int lastdir_depth, lastdir_len = -1;
 503         static unsigned int del_hier_name_len = 0;
 504         static int in_del_hier = 0;
 505         char thisname[MAXPATHLEN];
 506         unsigned int l1 = 0, l2 = 0;
 507         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 508         OFF_T file_length;
 509         char *basename, *dirname, *bp;
 510         struct file_struct *file;
 511
 512         if (!flist) {
 513                 modtime = 0, mode = 0;
 514                 dev = 0, rdev = makedev(0, 0);
 515                 rdev_major = 0;
 516                 uid = 0, gid = 0;
 517                 *lastname = '\0';
 518                 lastdir_len = -1;
 519                 in_del_hier = 0;
 520                 return NULL;
 521         }
 522
 523         if (flags & XMIT_SAME_NAME)
 524                 l1 = read_byte(f);
 525
 526         if (flags & XMIT_LONG_NAME)
 527                 l2 = read_int(f);
 528         else
 529                 l2 = read_byte(f);
 530
 531         if (l2 >= MAXPATHLEN - l1) {
 532                 rprintf(FERROR,
 533                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 534                         flags, l1, l2, safe_fname(lastname));
 535                 overflow_exit("receive_file_entry");
 536         }
 537
 538         strlcpy(thisname, lastname, l1 + 1);
 539         read_sbuf(f, &thisname[l1], l2);
 540         thisname[l1 + l2] = 0;
 541
 542         strlcpy(lastname, thisname, MAXPATHLEN);
 543
 544         clean_fname(thisname, 0);
 545
 546         if (sanitize_paths)
 547                 sanitize_path(thisname, thisname, "", 0);
 548
 549         if ((basename = strrchr(thisname, '/')) != NULL) {
 550                 dirname_len = ++basename - thisname; /* counts future '\0' */
 551                 if (lastdir_len == dirname_len - 1
 552                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 553                         dirname = lastdir;
 554                         dirname_len = 0; /* indicates no copy is needed */
 555                 } else
 556                         dirname = thisname;
 557         } else {
 558                 basename = thisname;
 559                 dirname = NULL;
 560                 dirname_len = 0;
 561         }
 562         basename_len = strlen(basename) + 1; /* count the '\0' */
 563
 564         file_length = read_longint(f);
 565         if (!(flags & XMIT_SAME_TIME))
 566                 modtime = (time_t)read_int(f);
 567         if (!(flags & XMIT_SAME_MODE))
 568                 mode = from_wire_mode(read_int(f));
 569
 570         if (preserve_uid && !(flags & XMIT_SAME_UID))
 571                 uid = (uid_t)read_int(f);
 572         if (preserve_gid && !(flags & XMIT_SAME_GID))
 573                 gid = (gid_t)read_int(f);
 574
 575         if (preserve_devices) {
 576                 if (protocol_version < 28) {
 577                         if (IS_DEVICE(mode)) {
 578                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 579                                         rdev = (dev_t)read_int(f);
 580                         } else
 581                                 rdev = makedev(0, 0);
 582                 } else if (IS_DEVICE(mode)) {
 583                         uint32 rdev_minor;
 584                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 585                                 rdev_major = read_int(f);
 586                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 587                                 rdev_minor = read_byte(f);
 588                         else
 589                                 rdev_minor = read_int(f);
 590                         rdev = makedev(rdev_major, rdev_minor);
 591                 }
 592         }
 593
 594 #ifdef SUPPORT_LINKS
 595         if (preserve_links && S_ISLNK(mode)) {
 596                 linkname_len = read_int(f) + 1; /* count the '\0' */
 597                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 598                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 599                                 linkname_len - 1);
 600                         overflow_exit("receive_file_entry");
 601                 }
 602         }
 603         else
 604 #endif
 605                 linkname_len = 0;
 606
 607         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 608
 609         alloc_len = file_struct_len + dirname_len + basename_len
 610                   + linkname_len + sum_len;
 611         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 612
 613         file = (struct file_struct *)bp;
 614         memset(bp, 0, file_struct_len);
 615         bp += file_struct_len;
 616
 617         file->flags = 0;
 618         file->modtime = modtime;
 619         file->length = file_length;
 620         file->mode = mode;
 621         file->uid = uid;
 622         file->gid = gid;
 623
 624         if (dirname_len) {
 625                 file->dirname = lastdir = bp;
 626                 lastdir_len = dirname_len - 1;
 627                 memcpy(bp, dirname, dirname_len - 1);
 628                 bp += dirname_len;
 629                 bp[-1] = '\0';
 630                 lastdir_depth = count_dir_elements(lastdir);
 631                 file->dir.depth = lastdir_depth + 1;
 632         } else if (dirname) {
 633                 file->dirname = dirname; /* we're reusing lastname */
 634                 file->dir.depth = lastdir_depth + 1;
 635         } else
 636                 file->dir.depth = 1;
 637
 638         if (S_ISDIR(mode)) {
 639                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 640                         file->dir.depth--;
 641                 if (flags & XMIT_TOP_DIR) {
 642                         in_del_hier = recurse;
 643                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 644                         if (relative_paths && del_hier_name_len > 2
 645                             && basename_len == 1+1 && *basename == '.')
 646                                 del_hier_name_len -= 2;
 647                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 648                 } else if (in_del_hier) {
 649                         if (!relative_paths || !del_hier_name_len
 650                          || (l1 >= del_hier_name_len
 651                           && thisname[del_hier_name_len] == '/'))
 652                                 file->flags |= FLAG_DEL_HERE;
 653                         else
 654                                 in_del_hier = 0;
 655                 }
 656         }
 657
 658         file->basename = bp;
 659         memcpy(bp, basename, basename_len);
 660         bp += basename_len;
 661
 662         if (preserve_devices && IS_DEVICE(mode))
 663                 file->u.rdev = rdev;
 664
 665 #ifdef SUPPORT_LINKS
 666         if (linkname_len) {
 667                 file->u.link = bp;
 668                 read_sbuf(f, bp, linkname_len - 1);
 669                 if (sanitize_paths)
 670                         sanitize_path(bp, bp, "", lastdir_depth);
 671                 bp += linkname_len;
 672         }
 673 #endif
 674
 675 #ifdef SUPPORT_HARD_LINKS
 676         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 677                 flags |= XMIT_HAS_IDEV_DATA;
 678         if (flags & XMIT_HAS_IDEV_DATA) {
 679                 int64 inode;
 680                 if (protocol_version < 26) {
 681                         dev = read_int(f);
 682                         inode = read_int(f);
 683                 } else {
 684                         if (!(flags & XMIT_SAME_DEV))
 685                                 dev = read_longint(f);
 686                         inode = read_longint(f);
 687                 }
 688                 if (flist->hlink_pool) {
 689                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 690                             struct idev, 1, "inode_table");
 691                         file->F_INODE = inode;
 692                         file->F_DEV = dev;
 693                 }
 694         }
 695 #endif
 696
 697         if (always_checksum && (sum_len || protocol_version < 28)) {
 698                 char *sum;
 699                 int slen = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
 700                 if (sum_len) {
 701                         file->u.sum = sum = bp;
 702                         /*bp += sum_len;*/
 703                 } else {
 704                         /* Prior to 28, we get a useless set of nulls. */
 705                         sum = empty_sum;
 706                 }
 707                 read_buf(f, sum, slen);
 708         }
 709
 710         if (!preserve_perms) {
 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         return file;
 717 }
 718
 719 /**
 720  * Create a file_struct for a named file by reading its stat()
 721  * information and performing extensive checks against global
 722  * options.
 723  *
 724  * @return the new file, or NULL if there was an error or this file
 725  * should be excluded.
 726  *
 727  * @todo There is a small optimization opportunity here to avoid
 728  * stat()ing the file in some circumstances, which has a certain cost.
 729  * We are called immediately after doing readdir(), and so we may
 730  * already know the d_type of the file.  We could for example avoid
 731  * statting directories if we're not recursing, but this is not a very
 732  * important case.  Some systems may not have d_type.
 733  **/
 734 struct file_struct *make_file(char *fname, struct file_list *flist,
 735                               int filter_level)
 736 {
 737         static char *lastdir;
 738         static int lastdir_len = -1;
 739         struct file_struct *file;
 740         STRUCT_STAT st;
 741         char sum[SUM_LENGTH];
 742         char thisname[MAXPATHLEN];
 743         char linkname[MAXPATHLEN];
 744         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 745         char *basename, *dirname, *bp;
 746         unsigned short flags = 0;
 747
 748         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 749                 lastdir_len = -1;
 750
 751         if (strlcpy(thisname, fname, sizeof thisname)
 752             >= sizeof thisname - flist_dir_len) {
 753                 rprintf(FINFO, "skipping overly long name: %s\n",
 754                         safe_fname(fname));
 755                 return NULL;
 756         }
 757         clean_fname(thisname, 0);
 758         if (sanitize_paths)
 759                 sanitize_path(thisname, thisname, "", 0);
 760
 761         memset(sum, 0, SUM_LENGTH);
 762
 763         if (readlink_stat(thisname, &st, linkname) != 0) {
 764                 int save_errno = errno;
 765                 /* See if file is excluded before reporting an error. */
 766                 if (filter_level != NO_FILTERS
 767                     && is_excluded(thisname, 0, filter_level))
 768                         return NULL;
 769                 if (save_errno == ENOENT) {
 770 #ifdef SUPPORT_LINKS
 771                         /* Avoid "vanished" error if symlink points nowhere. */
 772                         if (copy_links && do_lstat(thisname, &st) == 0
 773                             && S_ISLNK(st.st_mode)) {
 774                                 io_error |= IOERR_GENERAL;
 775                                 rprintf(FERROR, "symlink has no referent: %s\n",
 776                                         full_fname(thisname));
 777                         } else
 778 #endif
 779                         {
 780                                 enum logcode c = am_daemon && protocol_version < 28
 781                                     ? FERROR : FINFO;
 782                                 io_error |= IOERR_VANISHED;
 783                                 rprintf(c, "file has vanished: %s\n",
 784                                         full_fname(thisname));
 785                         }
 786                 } else {
 787                         io_error |= IOERR_GENERAL;
 788                         rsyserr(FERROR, save_errno, "readlink %s failed",
 789                                 full_fname(thisname));
 790                 }
 791                 return NULL;
 792         }
 793
 794         /* backup.c calls us with filter_level set to NO_FILTERS. */
 795         if (filter_level == NO_FILTERS)
 796                 goto skip_filters;
 797
 798         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 799                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
 800                 return NULL;
 801         }
 802
 803         /* We only care about directories because we need to avoid recursing
 804          * into a mount-point directory, not to avoid copying a symlinked
 805          * file if -L (or similar) was specified. */
 806         if (one_file_system && st.st_dev != filesystem_dev
 807             && S_ISDIR(st.st_mode))
 808                 flags |= FLAG_MOUNT_POINT;
 809
 810         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 811                 return NULL;
 812
 813         if (lp_ignore_nonreadable(module_id)) {
 814 #ifdef SUPPORT_LINKS
 815                 if (!S_ISLNK(st.st_mode))
 816 #endif
 817                         if (access(thisname, R_OK) != 0)
 818                                 return NULL;
 819         }
 820
 821 skip_filters:
 822
 823         if (verbose > 2) {
 824                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 825                         who_am_i(), safe_fname(thisname), filter_level);
 826         }
 827
 828         if ((basename = strrchr(thisname, '/')) != NULL) {
 829                 dirname_len = ++basename - thisname; /* counts future '\0' */
 830                 if (lastdir_len == dirname_len - 1
 831                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 832                         dirname = lastdir;
 833                         dirname_len = 0; /* indicates no copy is needed */
 834                 } else
 835                         dirname = thisname;
 836         } else {
 837                 basename = thisname;
 838                 dirname = NULL;
 839                 dirname_len = 0;
 840         }
 841         basename_len = strlen(basename) + 1; /* count the '\0' */
 842
 843 #ifdef SUPPORT_LINKS
 844         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 845 #else
 846         linkname_len = 0;
 847 #endif
 848
 849         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 850
 851         alloc_len = file_struct_len + dirname_len + basename_len
 852             + linkname_len + sum_len;
 853         if (flist) {
 854                 bp = pool_alloc(flist->file_pool, alloc_len,
 855                     "receive_file_entry");
 856         } else {
 857                 if (!(bp = new_array(char, alloc_len)))
 858                         out_of_memory("receive_file_entry");
 859         }
 860
 861         file = (struct file_struct *)bp;
 862         memset(bp, 0, file_struct_len);
 863         bp += file_struct_len;
 864
 865         file->flags = flags;
 866         file->modtime = st.st_mtime;
 867         file->length = st.st_size;
 868         file->mode = st.st_mode;
 869         file->uid = st.st_uid;
 870         file->gid = st.st_gid;
 871
 872 #ifdef SUPPORT_HARD_LINKS
 873         if (flist && flist->hlink_pool) {
 874                 if (protocol_version < 28) {
 875                         if (S_ISREG(st.st_mode))
 876                                 file->link_u.idev = pool_talloc(
 877                                     flist->hlink_pool, struct idev, 1,
 878                                     "inode_table");
 879                 } else {
 880                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 881                                 file->link_u.idev = pool_talloc(
 882                                     flist->hlink_pool, struct idev, 1,
 883                                     "inode_table");
 884                 }
 885         }
 886         if (file->link_u.idev) {
 887                 file->F_DEV = st.st_dev;
 888                 file->F_INODE = st.st_ino;
 889         }
 890 #endif
 891
 892         if (dirname_len) {
 893                 file->dirname = lastdir = bp;
 894                 lastdir_len = dirname_len - 1;
 895                 memcpy(bp, dirname, dirname_len - 1);
 896                 bp += dirname_len;
 897                 bp[-1] = '\0';
 898         } else if (dirname)
 899                 file->dirname = dirname;
 900
 901         file->basename = bp;
 902         memcpy(bp, basename, basename_len);
 903         bp += basename_len;
 904
 905 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 906         if (preserve_devices && IS_DEVICE(st.st_mode))
 907                 file->u.rdev = st.st_rdev;
 908 #endif
 909
 910 #ifdef SUPPORT_LINKS
 911         if (linkname_len) {
 912                 file->u.link = bp;
 913                 memcpy(bp, linkname, linkname_len);
 914                 bp += linkname_len;
 915         }
 916 #endif
 917
 918         if (sum_len) {
 919                 file->u.sum = bp;
 920                 file_checksum(thisname, bp, st.st_size);
 921                 /*bp += sum_len;*/
 922         }
 923
 924         file->dir.root = flist_dir;
 925
 926         /* This code is only used by the receiver when it is building
 927          * a list of files for a delete pass. */
 928         if (keep_dirlinks && linkname_len && flist) {
 929                 STRUCT_STAT st2;
 930                 int save_mode = file->mode;
 931                 file->mode = S_IFDIR; /* find a directory w/our name */
 932                 if (flist_find(the_file_list, file) >= 0
 933                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 934                         file->modtime = st2.st_mtime;
 935                         file->length = st2.st_size;
 936                         file->mode = st2.st_mode;
 937                         file->uid = st2.st_uid;
 938                         file->gid = st2.st_gid;
 939                         file->u.link = NULL;
 940                 } else
 941                         file->mode = save_mode;
 942         }
 943
 944         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 945                 stats.total_size += st.st_size;
 946
 947         return file;
 948 }
 949
 950 static struct file_struct *send_file_name(int f, struct file_list *flist,
 951                                           char *fname, unsigned short base_flags)
 952 {
 953         struct file_struct *file;
 954
 955         file = make_file(fname, flist, f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 956         if (!file)
 957                 return NULL;
 958
 959         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 960
 961         flist_expand(flist);
 962
 963         if (file->basename[0]) {
 964                 flist->files[flist->count++] = file;
 965                 send_file_entry(file, f, base_flags);
 966         }
 967         return file;
 968 }
 969
 970 static void send_if_directory(int f, struct file_list *flist,
 971                               struct file_struct *file)
 972 {
 973         char fbuf[MAXPATHLEN];
 974
 975         if (S_ISDIR(file->mode)
 976             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 977                 void *save_filters;
 978                 unsigned int len = strlen(fbuf);
 979                 if (len > 1 && fbuf[len-1] == '/')
 980                         fbuf[--len] = '\0';
 981                 if (len >= MAXPATHLEN - 1) {
 982                         io_error |= IOERR_GENERAL;
 983                         rprintf(FERROR, "skipping long-named directory: %s\n",
 984                                 full_fname(fbuf));
 985                         return;
 986                 }
 987                 save_filters = push_local_filters(fbuf, len);
 988                 send_directory(f, flist, fbuf, len);
 989                 pop_local_filters(save_filters);
 990         }
 991 }
 992
 993 /* This function is normally called by the sender, but the receiving side also
 994  * calls it from get_dirlist() with f set to -1 so that we just construct the
 995  * file list in memory without sending it over the wire.  Also, get_dirlist()
 996  * might call this with f set to -2, which also indicates that local filter
 997  * rules should be ignored. */
 998 static void send_directory(int f, struct file_list *flist,
 999                            char *fbuf, int len)
1000 {
1001         struct dirent *di;
1002         unsigned remainder;
1003         char *p;
1004         DIR *d;
1005         int start = flist->count;
1006
1007         if (!(d = opendir(fbuf))) {
1008                 io_error |= IOERR_GENERAL;
1009                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1010                 return;
1011         }
1012
1013         p = fbuf + len;
1014         if (len != 1 || *fbuf != '/')
1015                 *p++ = '/';
1016         *p = '\0';
1017         remainder = MAXPATHLEN - (p - fbuf);
1018
1019         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1020                 char *dname = d_name(di);
1021                 if (dname[0] == '.' && (dname[1] == '\0'
1022                     || (dname[1] == '.' && dname[2] == '\0')))
1023                         continue;
1024                 if (strlcpy(p, dname, remainder) < remainder)
1025                         send_file_name(f, flist, fbuf, 0);
1026                 else {
1027                         io_error |= IOERR_GENERAL;
1028                         rprintf(FINFO,
1029                                 "cannot send long-named file %s\n",
1030                                 full_fname(fbuf));
1031                 }
1032         }
1033
1034         fbuf[len] = '\0';
1035
1036         if (errno) {
1037                 io_error |= IOERR_GENERAL;
1038                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1039         }
1040
1041         closedir(d);
1042
1043         if (recurse) {
1044                 int i, end = flist->count - 1;
1045                 for (i = start; i <= end; i++)
1046                         send_if_directory(f, flist, flist->files[i]);
1047         }
1048 }
1049
1050 struct file_list *send_file_list(int f, int argc, char *argv[])
1051 {
1052         int l;
1053         STRUCT_STAT st;
1054         char *p, *dir, olddir[sizeof curr_dir];
1055         char lastpath[MAXPATHLEN] = "";
1056         struct file_list *flist;
1057         struct timeval start_tv, end_tv;
1058         int64 start_write;
1059         int use_ff_fd = 0;
1060
1061         if (show_filelist_p())
1062                 start_filelist_progress("building file list");
1063
1064         start_write = stats.total_written;
1065         gettimeofday(&start_tv, NULL);
1066
1067         flist = flist_new(WITH_HLINK, "send_file_list");
1068
1069         io_start_buffering_out();
1070         if (filesfrom_fd >= 0) {
1071                 if (argv[0] && !push_dir(argv[0])) {
1072                         rsyserr(FERROR, errno, "push_dir %s failed",
1073                                 full_fname(argv[0]));
1074                         exit_cleanup(RERR_FILESELECT);
1075                 }
1076                 use_ff_fd = 1;
1077         }
1078
1079         while (1) {
1080                 char fname2[MAXPATHLEN];
1081                 char *fname = fname2;
1082                 int is_dot_dir;
1083
1084                 if (use_ff_fd) {
1085                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1086                                 break;
1087                         sanitize_path(fname, fname, "", 0);
1088                 } else {
1089                         if (argc-- == 0)
1090                                 break;
1091                         strlcpy(fname, *argv++, MAXPATHLEN);
1092                         if (sanitize_paths)
1093                                 sanitize_path(fname, fname, "", 0);
1094                 }
1095
1096                 l = strlen(fname);
1097                 if (!l || fname[l - 1] == '/') {
1098                         if (l == 2 && fname[0] == '.') {
1099                                 /* Turn "./" into just "." rather than "./." */
1100                                 fname[1] = '\0';
1101                         } else {
1102                                 if (l + 1 >= MAXPATHLEN)
1103                                         overflow_exit("send_file_list");
1104                                 fname[l++] = '.';
1105                                 fname[l] = '\0';
1106                         }
1107                         is_dot_dir = 1;
1108                 } else if (l > 1 && fname[l-1] == '.' && fname[l-2] == '.'
1109                     && (l == 2 || fname[l-3] == '/')) {
1110                         if (l + 2 >= MAXPATHLEN)
1111                                 overflow_exit("send_file_list");
1112                         fname[l++] = '/';
1113                         fname[l++] = '.';
1114                         fname[l] = '\0';
1115                         is_dot_dir = 1;
1116                 } else {
1117                         is_dot_dir = fname[l-1] == '.'
1118                                    && (l == 1 || fname[l-2] == '/');
1119                 }
1120
1121                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1122                         io_error |= IOERR_GENERAL;
1123                         rsyserr(FERROR, errno, "link_stat %s failed",
1124                                 full_fname(fname));
1125                         continue;
1126                 }
1127
1128                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1129                         rprintf(FINFO, "skipping directory %s\n",
1130                                 safe_fname(fname));
1131                         continue;
1132                 }
1133
1134                 dir = NULL;
1135                 olddir[0] = '\0';
1136
1137                 if (!relative_paths) {
1138                         p = strrchr(fname, '/');
1139                         if (p) {
1140                                 *p = '\0';
1141                                 if (p == fname)
1142                                         dir = "/";
1143                                 else
1144                                         dir = fname;
1145                                 fname = p + 1;
1146                         }
1147                 } else if ((p = strstr(fname, "/./")) != NULL) {
1148                         *p = '\0';
1149                         if (p == fname)
1150                                 dir = "/";
1151                         else
1152                                 dir = fname;
1153                         fname = p + 3;
1154                 }
1155
1156                 if (!*fname)
1157                         fname = ".";
1158
1159                 if (dir && *dir) {
1160                         static char *lastdir;
1161                         static int lastdir_len;
1162
1163                         strlcpy(olddir, curr_dir, sizeof olddir);
1164
1165                         if (!push_dir(dir)) {
1166                                 io_error |= IOERR_GENERAL;
1167                                 rsyserr(FERROR, errno, "push_dir %s failed",
1168                                         full_fname(dir));
1169                                 continue;
1170                         }
1171
1172                         if (lastdir && strcmp(lastdir, dir) == 0) {
1173                                 flist_dir = lastdir;
1174                                 flist_dir_len = lastdir_len;
1175                         } else {
1176                                 flist_dir = lastdir = strdup(dir);
1177                                 flist_dir_len = lastdir_len = strlen(dir);
1178                         }
1179                 }
1180
1181                 if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1182                         /* Send the implied directories at the start of the
1183                          * source spec, so we get their permissions right. */
1184                         char *lp = lastpath, *fn = fname, *slash = fname;
1185                         *p = '\0';
1186                         /* Skip any initial directories in our path that we
1187                          * have in common with lastpath. */
1188                         while (*fn && *lp == *fn) {
1189                                 if (*fn == '/')
1190                                         slash = fn;
1191                                 lp++, fn++;
1192                         }
1193                         *p = '/';
1194                         if (fn != p || (*lp && *lp != '/')) {
1195                                 int save_copy_links = copy_links;
1196                                 int save_xfer_dirs = xfer_dirs;
1197                                 copy_links = copy_unsafe_links;
1198                                 xfer_dirs = 1;
1199                                 while ((slash = strchr(slash+1, '/')) != 0) {
1200                                         *slash = '\0';
1201                                         send_file_name(f, flist, fname, 0);
1202                                         *slash = '/';
1203                                 }
1204                                 copy_links = save_copy_links;
1205                                 xfer_dirs = save_xfer_dirs;
1206                                 *p = '\0';
1207                                 strlcpy(lastpath, fname, sizeof lastpath);
1208                                 *p = '/';
1209                         }
1210                 }
1211
1212                 if (one_file_system)
1213                         filesystem_dev = st.st_dev;
1214
1215                 if (recurse || (xfer_dirs && is_dot_dir)) {
1216                         struct file_struct *file;
1217                         if ((file = send_file_name(f, flist, fname, XMIT_TOP_DIR)))
1218                                 send_if_directory(f, flist, file);
1219                 } else
1220                         send_file_name(f, flist, fname, 0);
1221
1222                 if (olddir[0]) {
1223                         flist_dir = NULL;
1224                         flist_dir_len = 0;
1225                         if (!pop_dir(olddir)) {
1226                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1227                                         full_fname(olddir));
1228                                 exit_cleanup(RERR_FILESELECT);
1229                         }
1230                 }
1231         }
1232
1233         gettimeofday(&end_tv, NULL);
1234         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1235                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1236         if (stats.flist_buildtime == 0)
1237                 stats.flist_buildtime = 1;
1238         start_tv = end_tv;
1239
1240         send_file_entry(NULL, f, 0);
1241
1242         if (show_filelist_p())
1243                 finish_filelist_progress(flist);
1244
1245         gettimeofday(&end_tv, NULL);
1246         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1247                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1248
1249         if (flist->hlink_pool) {
1250                 pool_destroy(flist->hlink_pool);
1251                 flist->hlink_pool = NULL;
1252         }
1253
1254         /* Sort the list without removing any duplicates.  This allows the
1255          * receiving side to ask for any name they like, which gives us the
1256          * flexibility to change the way we unduplicate names in the future
1257          * without causing a compatibility problem with older versions. */
1258         clean_flist(flist, 0, 0);
1259
1260         /* Now send the uid/gid list. This was introduced in
1261          * protocol version 15 */
1262         send_uid_list(f);
1263
1264         /* send the io_error flag */
1265         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1266
1267         io_end_buffering();
1268         stats.flist_size = stats.total_written - start_write;
1269         stats.num_files = flist->count;
1270
1271         if (verbose > 3)
1272                 output_flist(flist);
1273
1274         if (verbose > 2)
1275                 rprintf(FINFO, "send_file_list done\n");
1276
1277         return flist;
1278 }
1279
1280 struct file_list *recv_file_list(int f)
1281 {
1282         struct file_list *flist;
1283         unsigned short flags;
1284         int64 start_read;
1285
1286         if (show_filelist_p())
1287                 start_filelist_progress("receiving file list");
1288
1289         start_read = stats.total_read;
1290
1291         flist = flist_new(WITH_HLINK, "recv_file_list");
1292
1293         flist->count = 0;
1294         flist->malloced = 1000;
1295         flist->files = new_array(struct file_struct *, flist->malloced);
1296         if (!flist->files)
1297                 goto oom;
1298
1299
1300         while ((flags = read_byte(f)) != 0) {
1301                 struct file_struct *file;
1302
1303                 flist_expand(flist);
1304
1305                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1306                         flags |= read_byte(f) << 8;
1307                 file = receive_file_entry(flist, flags, f);
1308
1309                 if (S_ISREG(file->mode))
1310                         stats.total_size += file->length;
1311
1312                 flist->files[flist->count++] = file;
1313
1314                 maybe_emit_filelist_progress(flist->count);
1315
1316                 if (verbose > 2) {
1317                         rprintf(FINFO, "recv_file_name(%s)\n",
1318                                 safe_fname(f_name(file)));
1319                 }
1320         }
1321         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1322
1323         if (verbose > 2)
1324                 rprintf(FINFO, "received %d names\n", flist->count);
1325
1326         if (show_filelist_p())
1327                 finish_filelist_progress(flist);
1328
1329         clean_flist(flist, relative_paths, 1);
1330
1331         if (f >= 0) {
1332                 /* Now send the uid/gid list. This was introduced in
1333                  * protocol version 15 */
1334                 recv_uid_list(f, flist);
1335
1336                 /* Recv the io_error flag */
1337                 if (lp_ignore_errors(module_id) || ignore_errors)
1338                         read_int(f);
1339                 else
1340                         io_error |= read_int(f);
1341         }
1342
1343         if (verbose > 3)
1344                 output_flist(flist);
1345
1346         if (list_only) {
1347                 int i;
1348                 for (i = 0; i < flist->count; i++)
1349                         list_file_entry(flist->files[i]);
1350         }
1351
1352         if (verbose > 2)
1353                 rprintf(FINFO, "recv_file_list done\n");
1354
1355         stats.flist_size = stats.total_read - start_read;
1356         stats.num_files = flist->count;
1357
1358         return flist;
1359
1360 oom:
1361         out_of_memory("recv_file_list");
1362         return NULL;            /* not reached */
1363 }
1364
1365 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1366 {
1367         return f_name_cmp(*file1, *file2);
1368 }
1369
1370 /* Search for an identically-named item in the file list.  Note that the
1371  * items must agree in their directory-ness, or no match is returned. */
1372 int flist_find(struct file_list *flist, struct file_struct *f)
1373 {
1374         int low = flist->low, high = flist->high;
1375         int ret, mid, mid_up;
1376
1377         while (low <= high) {
1378                 mid = (low + high) / 2;
1379                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1380                 if (mid_up <= high)
1381                         ret = f_name_cmp(flist->files[mid_up], f);
1382                 else
1383                         ret = 1;
1384                 if (ret == 0) {
1385                         if (protocol_version < 29
1386                             && S_ISDIR(flist->files[mid_up]->mode)
1387                             != S_ISDIR(f->mode))
1388                                 return -1;
1389                         return mid_up;
1390                 }
1391                 if (ret > 0)
1392                         high = mid - 1;
1393                 else
1394                         low = mid_up + 1;
1395         }
1396         return -1;
1397 }
1398
1399 /*
1400  * Free up any resources a file_struct has allocated
1401  * and clear the file.
1402  */
1403 void clear_file(int i, struct file_list *flist)
1404 {
1405         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1406                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1407         memset(flist->files[i], 0, file_struct_len);
1408 }
1409
1410 /*
1411  * allocate a new file list
1412  */
1413 struct file_list *flist_new(int with_hlink, char *msg)
1414 {
1415         struct file_list *flist;
1416
1417         flist = new(struct file_list);
1418         if (!flist)
1419                 out_of_memory(msg);
1420
1421         memset(flist, 0, sizeof (struct file_list));
1422
1423         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1424             out_of_memory, POOL_INTERN)))
1425                 out_of_memory(msg);
1426
1427 #ifdef SUPPORT_HARD_LINKS
1428         if (with_hlink && preserve_hard_links) {
1429                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1430                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1431                         out_of_memory(msg);
1432         }
1433 #endif
1434
1435         return flist;
1436 }
1437
1438 /*
1439  * free up all elements in a flist
1440  */
1441 void flist_free(struct file_list *flist)
1442 {
1443         pool_destroy(flist->file_pool);
1444         pool_destroy(flist->hlink_pool);
1445         free(flist->files);
1446         free(flist);
1447 }
1448
1449 /*
1450  * This routine ensures we don't have any duplicate names in our file list.
1451  * duplicate names can cause corruption because of the pipelining
1452  */
1453 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1454 {
1455         int i, prev_i = 0;
1456
1457         if (!flist)
1458                 return;
1459         if (flist->count == 0) {
1460                 flist->high = -1;
1461                 return;
1462         }
1463
1464         sorting_flist = flist;
1465         qsort(flist->files, flist->count,
1466             sizeof flist->files[0], (int (*)())file_compare);
1467         sorting_flist = NULL;
1468
1469         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1470                 if (flist->files[i]->basename) {
1471                         prev_i = i;
1472                         break;
1473                 }
1474         }
1475         flist->low = prev_i;
1476         while (++i < flist->count) {
1477                 int j;
1478                 struct file_struct *file = flist->files[i];
1479
1480                 if (!file->basename)
1481                         continue;
1482                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1483                         j = prev_i;
1484                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1485                         int save_mode = file->mode;
1486                         /* Make sure that this directory doesn't duplicate a
1487                          * non-directory earlier in the list. */
1488                         flist->high = prev_i;
1489                         file->mode = S_IFREG;
1490                         j = flist_find(flist, file);
1491                         file->mode = save_mode;
1492                 } else
1493                         j = -1;
1494                 if (j >= 0) {
1495                         struct file_struct *fp = flist->files[j];
1496                         int keep, drop;
1497                         /* If one is a dir and the other is not, we want to
1498                          * keep the dir because it might have contents in the
1499                          * list. */
1500                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1501                                 if (S_ISDIR(file->mode))
1502                                         keep = i, drop = j;
1503                                 else
1504                                         keep = j, drop = i;
1505                         } else
1506                                 keep = j, drop = i;
1507                         if (verbose > 1 && !am_server) {
1508                                 rprintf(FINFO,
1509                                         "removing duplicate name %s from file list (%d)\n",
1510                                         safe_fname(f_name(file)), drop);
1511                         }
1512                         /* Make sure that if we unduplicate '.', that we don't
1513                          * lose track of a user-specified top directory. */
1514                         flist->files[keep]->flags |= flist->files[drop]->flags
1515                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1516
1517                         clear_file(drop, flist);
1518
1519                         if (keep == i) {
1520                                 if (flist->low == drop) {
1521                                         for (j = drop + 1;
1522                                              j < i && !flist->files[j]->basename;
1523                                              j++) {}
1524                                         flist->low = j;
1525                                 }
1526                                 prev_i = i;
1527                         }
1528                 } else
1529                         prev_i = i;
1530         }
1531         flist->high = no_dups ? prev_i : flist->count - 1;
1532
1533         if (strip_root) {
1534                 /* We need to strip off the leading slashes for relative
1535                  * paths, but this must be done _after_ the sorting phase. */
1536                 for (i = flist->low; i <= flist->high; i++) {
1537                         struct file_struct *file = flist->files[i];
1538
1539                         if (!file->dirname)
1540                                 continue;
1541                         if (*file->dirname == '/') {
1542                                 char *s = file->dirname + 1;
1543                                 while (*s == '/') s++;
1544                                 memmove(file->dirname, s, strlen(s) + 1);
1545                         }
1546
1547                         if (!*file->dirname)
1548                                 file->dirname = NULL;
1549                 }
1550         }
1551 }
1552
1553 static void output_flist(struct file_list *flist)
1554 {
1555         char uidbuf[16], gidbuf[16], depthbuf[16];
1556         struct file_struct *file;
1557         const char *who = who_am_i();
1558         int i;
1559
1560         for (i = 0; i < flist->count; i++) {
1561                 file = flist->files[i];
1562                 if ((am_root || am_sender) && preserve_uid)
1563                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1564                 else
1565                         *uidbuf = '\0';
1566                 if (preserve_gid && file->gid != GID_NONE)
1567                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1568                 else
1569                         *gidbuf = '\0';
1570                 if (!am_sender)
1571                         sprintf(depthbuf, "%d", file->dir.depth);
1572                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1573                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1574                         file->dirname ? safe_fname(file->dirname) : "",
1575                         file->dirname ? "/" : "", NS(file->basename),
1576                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1577                         (double)file->length, uidbuf, gidbuf, file->flags);
1578         }
1579 }
1580
1581 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1582 enum fnc_type { t_PATH, t_ITEM };
1583
1584 /* Compare the names of two file_struct entities, similar to how strcmp()
1585  * would do if it were operating on the joined strings.
1586  *
1587  * Some differences beginning with protocol_version 29: (1) directory names
1588  * are compared with an assumed trailing slash so that they compare in a
1589  * way that would cause them to sort immediately prior to any content they
1590  * may have; (2) a directory of any name compares after a non-directory of
1591  * any name at the same depth; (3) a directory with name "." compares prior
1592  * to anything else.  These changes mean that a directory and a non-dir
1593  * with the same name will not compare as equal (protocol_version >= 29).
1594  *
1595  * The dirname component can be an empty string, but the basename component
1596  * cannot (and never is in the current codebase).  The basename component
1597  * may be NULL (for a removed item), in which case it is considered to be
1598  * after any existing item. */
1599 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1600 {
1601         int dif;
1602         const uchar *c1, *c2;
1603         enum fnc_state state1, state2;
1604         enum fnc_type type1, type2;
1605         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1606
1607         if (!f1 || !f1->basename) {
1608                 if (!f2 || !f2->basename)
1609                         return 0;
1610                 return -1;
1611         }
1612         if (!f2 || !f2->basename)
1613                 return 1;
1614
1615         c1 = (uchar*)f1->dirname;
1616         c2 = (uchar*)f2->dirname;
1617         if (c1 == c2)
1618                 c1 = c2 = NULL;
1619         if (!c1) {
1620                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1621                 c1 = (uchar*)f1->basename;
1622                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1623                         type1 = t_ITEM;
1624                         state1 = s_TRAILING;
1625                         c1 = (uchar*)"";
1626                 } else
1627                         state1 = s_BASE;
1628         } else if (!*c1) {
1629                 type1 = t_path;
1630                 state1 = s_SLASH;
1631                 c1 = (uchar*)"/";
1632         } else {
1633                 type1 = t_path;
1634                 state1 = s_DIR;
1635         }
1636         if (!c2) {
1637                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1638                 c2 = (uchar*)f2->basename;
1639                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1640                         type2 = t_ITEM;
1641                         state2 = s_TRAILING;
1642                         c2 = (uchar*)"";
1643                 } else
1644                         state2 = s_BASE;
1645         } else if (!*c2) {
1646                 type2 = t_path;
1647                 state2 = s_SLASH;
1648                 c2 = (uchar*)"/";
1649         } else {
1650                 type2 = t_path;
1651                 state2 = s_DIR;
1652         }
1653
1654         if (type1 != type2)
1655                 return type1 == t_PATH ? 1 : -1;
1656
1657         while (1) {
1658                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1659                         break;
1660                 if (!*c1) {
1661                         switch (state1) {
1662                         case s_DIR:
1663                                 state1 = s_SLASH;
1664                                 c1 = (uchar*)"/";
1665                                 break;
1666                         case s_SLASH:
1667                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1668                                 c1 = (uchar*)f1->basename;
1669                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1670                                         type1 = t_ITEM;
1671                                         state1 = s_TRAILING;
1672                                         c1 = (uchar*)"";
1673                                 } else
1674                                         state1 = s_BASE;
1675                                 break;
1676                         case s_BASE:
1677                                 state1 = s_TRAILING;
1678                                 if (type1 == t_PATH) {
1679                                         c1 = (uchar*)"/";
1680                                         break;
1681                                 }
1682                                 /* FALL THROUGH */
1683                         case s_TRAILING:
1684                                 type1 = t_ITEM;
1685                                 break;
1686                         }
1687                         if (*c2 && type1 != type2)
1688                                 return type1 == t_PATH ? 1 : -1;
1689                 }
1690                 if (!*c2) {
1691                         switch (state2) {
1692                         case s_DIR:
1693                                 state2 = s_SLASH;
1694                                 c2 = (uchar*)"/";
1695                                 break;
1696                         case s_SLASH:
1697                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1698                                 c2 = (uchar*)f2->basename;
1699                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1700                                         type2 = t_ITEM;
1701                                         state2 = s_TRAILING;
1702                                         c2 = (uchar*)"";
1703                                 } else
1704                                         state2 = s_BASE;
1705                                 break;
1706                         case s_BASE:
1707                                 state2 = s_TRAILING;
1708                                 if (type2 == t_PATH) {
1709                                         c2 = (uchar*)"/";
1710                                         break;
1711                                 }
1712                                 /* FALL THROUGH */
1713                         case s_TRAILING:
1714                                 if (!*c1)
1715                                         return 0;
1716                                 type2 = t_ITEM;
1717                                 break;
1718                         }
1719                         if (type1 != type2)
1720                                 return type1 == t_PATH ? 1 : -1;
1721                 }
1722         }
1723
1724         return dif;
1725 }
1726
1727 /* Return a copy of the full filename of a flist entry, using the indicated
1728  * buffer.  No size-checking is done because we checked the size when creating
1729  * the file_struct entry.
1730  */
1731 char *f_name_to(struct file_struct *f, char *fbuf)
1732 {
1733         if (!f || !f->basename)
1734                 return NULL;
1735
1736         if (f->dirname) {
1737                 int len = strlen(f->dirname);
1738                 memcpy(fbuf, f->dirname, len);
1739                 fbuf[len] = '/';
1740                 strcpy(fbuf + len + 1, f->basename);
1741         } else
1742                 strcpy(fbuf, f->basename);
1743         return fbuf;
1744 }
1745
1746 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1747 char *f_name(struct file_struct *f)
1748 {
1749         static char names[5][MAXPATHLEN];
1750         static unsigned int n;
1751
1752         n = (n + 1) % (sizeof names / sizeof names[0]);
1753
1754         return f_name_to(f, names[n]);
1755 }
1756
1757 /* Do a non-recursive scan of the named directory, possibly ignoring all
1758  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1759  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1760  * buffer (the functions we call will append names onto the end, but the old
1761  * dir value will be restored on exit). */
1762 struct file_list *get_dirlist(char *dirname, int dlen,
1763                               int ignore_filter_rules)
1764 {
1765         struct file_list *dirlist;
1766         char dirbuf[MAXPATHLEN];
1767         int save_recurse = recurse;
1768
1769         if (dlen < 0) {
1770                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1771                 if (dlen >= MAXPATHLEN)
1772                         return NULL;
1773                 dirname = dirbuf;
1774         }
1775
1776         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1777
1778         recurse = 0;
1779         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1780         recurse = save_recurse;
1781         if (do_progress)
1782                 flist_count_offset += dirlist->count;
1783
1784         clean_flist(dirlist, 0, 0);
1785
1786         if (verbose > 3)
1787                 output_flist(dirlist);
1788
1789         return dirlist;
1790 }