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 chmod_mode_struct *chmod_modes;
  66
  67 extern struct filter_list_struct filter_list;
  68 extern struct filter_list_struct server_filter_list;
  69
  70 int io_error;
  71 int checksum_len;
  72 dev_t filesystem_dev; /* used to implement -x */
  73
  74 static char empty_sum[MD4_SUM_LENGTH];
  75 static int flist_count_offset;
  76 static unsigned int file_struct_len;
  77 static struct file_list *sorting_flist;
  78
  79 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  80 static void output_flist(struct file_list *flist);
  81
  82 void init_flist(void)
  83 {
  84         struct file_struct f;
  85
  86         /* Figure out how big the file_struct is without trailing padding */
  87         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  88         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
  89 }
  90
  91 static int show_filelist_p(void)
  92 {
  93         return verbose && xfer_dirs && !am_server;
  94 }
  95
  96 static void start_filelist_progress(char *kind)
  97 {
  98         rprintf(FINFO, "%s ... ", kind);
  99         if (verbose > 1 || do_progress)
 100                 rprintf(FINFO, "\n");
 101         rflush(FINFO);
 102 }
 103
 104 static void emit_filelist_progress(int count)
 105 {
 106         rprintf(FINFO, " %d files...\r", count);
 107 }
 108
 109 static void maybe_emit_filelist_progress(int count)
 110 {
 111         if (do_progress && show_filelist_p() && (count % 100) == 0)
 112                 emit_filelist_progress(count);
 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 static void list_file_entry(struct file_struct *f)
 131 {
 132         char perms[11];
 133
 134         if (!f->basename) {
 135                 /* this can happen if duplicate names were removed */
 136                 return;
 137         }
 138
 139         permstring(perms, f->mode);
 140
 141 #ifdef 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                         safe_fname(f_name(f)), safe_fname(f->u.link));
 147         } else
 148 #endif
 149         {
 150                 rprintf(FINFO, "%s %11.0f %s %s\n",
 151                         perms,
 152                         (double)f->length, timestring(f->modtime),
 153                         safe_fname(f_name(f)));
 154         }
 155 }
 156
 157 /**
 158  * Stat either a symlink or its referent, depending on the settings of
 159  * copy_links, copy_unsafe_links, etc.
 160  *
 161  * @retval -1 on error
 162  *
 163  * @retval 0 for success
 164  *
 165  * @post If @p path is a symlink, then @p linkbuf (of size @c
 166  * MAXPATHLEN) contains the symlink target.
 167  *
 168  * @post @p buffer contains information about the link or the
 169  * referrent as appropriate, if they exist.
 170  **/
 171 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 172 {
 173 #ifdef SUPPORT_LINKS
 174         if (copy_links)
 175                 return do_stat(path, buffer);
 176         if (link_stat(path, buffer, 0) < 0)
 177                 return -1;
 178         if (S_ISLNK(buffer->st_mode)) {
 179                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 180                 if (l == -1)
 181                         return -1;
 182                 linkbuf[l] = 0;
 183                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 184                         if (verbose > 1) {
 185                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 186                                         safe_fname(path), safe_fname(linkbuf));
 187                         }
 188                         return do_stat(path, buffer);
 189                 }
 190         }
 191         return 0;
 192 #else
 193         return do_stat(path, buffer);
 194 #endif
 195 }
 196
 197 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 198 {
 199 #ifdef SUPPORT_LINKS
 200         if (copy_links)
 201                 return do_stat(path, buffer);
 202         if (do_lstat(path, buffer) < 0)
 203                 return -1;
 204         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 205                 STRUCT_STAT st;
 206                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 207                         *buffer = st;
 208         }
 209         return 0;
 210 #else
 211         return do_stat(path, buffer);
 212 #endif
 213 }
 214
 215 /* This function is used to check if a file should be included/excluded
 216  * from the list of files based on its name and type etc.  The value of
 217  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 218 static int is_excluded(char *fname, int is_dir, int filter_level)
 219 {
 220 #if 0 /* This currently never happens, so avoid a useless compare. */
 221         if (filter_level == NO_FILTERS)
 222                 return 0;
 223 #endif
 224         if (fname) {
 225                 /* never exclude '.', even if somebody does --exclude '*' */
 226                 if (fname[0] == '.' && !fname[1])
 227                         return 0;
 228                 /* Handle the -R version of the '.' dir. */
 229                 if (fname[0] == '/') {
 230                         int len = strlen(fname);
 231                         if (fname[len-1] == '.' && fname[len-2] == '/')
 232                                 return 0;
 233                 }
 234         }
 235         if (server_filter_list.head
 236             && check_filter(&server_filter_list, fname, is_dir) < 0)
 237                 return 1;
 238         if (filter_level != ALL_FILTERS)
 239                 return 0;
 240         if (filter_list.head
 241             && check_filter(&filter_list, fname, is_dir) < 0)
 242                 return 1;
 243         return 0;
 244 }
 245
 246 static int to_wire_mode(mode_t mode)
 247 {
 248 #ifdef SUPPORT_LINKS
 249         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 250                 return (mode & ~(_S_IFMT)) | 0120000;
 251 #endif
 252         return (int)mode;
 253 }
 254
 255 static mode_t from_wire_mode(int mode)
 256 {
 257         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 258                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 259         return (mode_t)mode;
 260 }
 261
 262 static void send_directory(int f, struct file_list *flist,
 263                            char *fbuf, int len);
 264
 265 static char *flist_dir;
 266 static int flist_dir_len;
 267
 268
 269 /**
 270  * Make sure @p flist is big enough to hold at least @p flist->count
 271  * entries.
 272  **/
 273 void flist_expand(struct file_list *flist)
 274 {
 275         struct file_struct **new_ptr;
 276
 277         if (flist->count < flist->malloced)
 278                 return;
 279
 280         if (flist->malloced < FLIST_START)
 281                 flist->malloced = FLIST_START;
 282         else if (flist->malloced >= FLIST_LINEAR)
 283                 flist->malloced += FLIST_LINEAR;
 284         else
 285                 flist->malloced *= 2;
 286
 287         /*
 288          * In case count jumped or we are starting the list
 289          * with a known size just set it.
 290          */
 291         if (flist->malloced < flist->count)
 292                 flist->malloced = flist->count;
 293
 294         new_ptr = realloc_array(flist->files, struct file_struct *,
 295                                 flist->malloced);
 296
 297         if (verbose >= 2 && flist->malloced != FLIST_START) {
 298                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 299                     who_am_i(),
 300                     (double)sizeof flist->files[0] * flist->malloced,
 301                     (new_ptr == flist->files) ? " not" : "");
 302         }
 303
 304         flist->files = new_ptr;
 305
 306         if (!flist->files)
 307                 out_of_memory("flist_expand");
 308 }
 309
 310 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 311 {
 312         unsigned short flags;
 313         static time_t modtime;
 314         static mode_t mode;
 315         static int64 dev;
 316         static dev_t rdev;
 317         static uint32 rdev_major;
 318         static uid_t uid;
 319         static gid_t gid;
 320         static char lastname[MAXPATHLEN];
 321         char fname[MAXPATHLEN];
 322         int l1, l2;
 323
 324         if (f < 0)
 325                 return;
 326
 327         if (!file) {
 328                 write_byte(f, 0);
 329                 modtime = 0, mode = 0;
 330                 dev = 0, rdev = makedev(0, 0);
 331                 rdev_major = 0;
 332                 uid = 0, gid = 0;
 333                 *lastname = '\0';
 334                 return;
 335         }
 336
 337         io_write_phase = "send_file_entry";
 338
 339         f_name_to(file, fname);
 340
 341         flags = base_flags;
 342
 343         if (file->mode == mode)
 344                 flags |= XMIT_SAME_MODE;
 345         else
 346                 mode = file->mode;
 347         if (preserve_devices) {
 348                 if (protocol_version < 28) {
 349                         if (IS_DEVICE(mode)) {
 350                                 if (file->u.rdev == rdev)
 351                                         flags |= XMIT_SAME_RDEV_pre28;
 352                                 else
 353                                         rdev = file->u.rdev;
 354                         } else
 355                                 rdev = makedev(0, 0);
 356                 } else if (IS_DEVICE(mode)) {
 357                         rdev = file->u.rdev;
 358                         if ((uint32)major(rdev) == rdev_major)
 359                                 flags |= XMIT_SAME_RDEV_MAJOR;
 360                         else
 361                                 rdev_major = major(rdev);
 362                         if ((uint32)minor(rdev) <= 0xFFu)
 363                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 364                 }
 365         }
 366         if (file->uid == uid)
 367                 flags |= XMIT_SAME_UID;
 368         else
 369                 uid = file->uid;
 370         if (file->gid == gid)
 371                 flags |= XMIT_SAME_GID;
 372         else
 373                 gid = file->gid;
 374         if (file->modtime == modtime)
 375                 flags |= XMIT_SAME_TIME;
 376         else
 377                 modtime = file->modtime;
 378
 379 #ifdef SUPPORT_HARD_LINKS
 380         if (file->link_u.idev) {
 381                 if (file->F_DEV == dev) {
 382                         if (protocol_version >= 28)
 383                                 flags |= XMIT_SAME_DEV;
 384                 } else
 385                         dev = file->F_DEV;
 386                 flags |= XMIT_HAS_IDEV_DATA;
 387         }
 388 #endif
 389
 390         for (l1 = 0;
 391             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 392             l1++) {}
 393         l2 = strlen(fname+l1);
 394
 395         if (l1 > 0)
 396                 flags |= XMIT_SAME_NAME;
 397         if (l2 > 255)
 398                 flags |= XMIT_LONG_NAME;
 399
 400         /* We must make sure we don't send a zero flag byte or the
 401          * other end will terminate the flist transfer.  Note that
 402          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 403          * it's harmless way to add a bit to the first flag byte. */
 404         if (protocol_version >= 28) {
 405                 if (!flags && !S_ISDIR(mode))
 406                         flags |= XMIT_TOP_DIR;
 407                 if ((flags & 0xFF00) || !flags) {
 408                         flags |= XMIT_EXTENDED_FLAGS;
 409                         write_byte(f, flags);
 410                         write_byte(f, flags >> 8);
 411                 } else
 412                         write_byte(f, flags);
 413         } else {
 414                 if (!(flags & 0xFF))
 415                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 416                 write_byte(f, flags);
 417         }
 418         if (flags & XMIT_SAME_NAME)
 419                 write_byte(f, l1);
 420         if (flags & XMIT_LONG_NAME)
 421                 write_int(f, l2);
 422         else
 423                 write_byte(f, l2);
 424         write_buf(f, fname + l1, l2);
 425
 426         write_longint(f, file->length);
 427         if (!(flags & XMIT_SAME_TIME))
 428                 write_int(f, modtime);
 429         if (!(flags & XMIT_SAME_MODE))
 430                 write_int(f, to_wire_mode(mode));
 431         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 432                 if (!numeric_ids)
 433                         add_uid(uid);
 434                 write_int(f, uid);
 435         }
 436         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 437                 if (!numeric_ids)
 438                         add_gid(gid);
 439                 write_int(f, gid);
 440         }
 441         if (preserve_devices && IS_DEVICE(mode)) {
 442                 if (protocol_version < 28) {
 443                         if (!(flags & XMIT_SAME_RDEV_pre28))
 444                                 write_int(f, (int)rdev);
 445                 } else {
 446                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 447                                 write_int(f, major(rdev));
 448                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 449                                 write_byte(f, minor(rdev));
 450                         else
 451                                 write_int(f, minor(rdev));
 452                 }
 453         }
 454
 455 #ifdef SUPPORT_LINKS
 456         if (preserve_links && S_ISLNK(mode)) {
 457                 int len = strlen(file->u.link);
 458                 write_int(f, len);
 459                 write_buf(f, file->u.link, len);
 460         }
 461 #endif
 462
 463 #ifdef SUPPORT_HARD_LINKS
 464         if (flags & XMIT_HAS_IDEV_DATA) {
 465                 if (protocol_version < 26) {
 466                         /* 32-bit dev_t and ino_t */
 467                         write_int(f, dev);
 468                         write_int(f, file->F_INODE);
 469                 } else {
 470                         /* 64-bit dev_t and ino_t */
 471                         if (!(flags & XMIT_SAME_DEV))
 472                                 write_longint(f, dev);
 473                         write_longint(f, file->F_INODE);
 474                 }
 475         }
 476 #endif
 477
 478         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 479                 char *sum;
 480                 if (S_ISREG(mode))
 481                         sum = file->u.sum;
 482                 else {
 483                         /* Prior to 28, we sent a useless set of nulls. */
 484                         sum = empty_sum;
 485                 }
 486                 write_buf(f, sum, checksum_len);
 487         }
 488
 489         strlcpy(lastname, fname, MAXPATHLEN);
 490
 491         io_write_phase = "unknown";
 492 }
 493
 494 static struct file_struct *receive_file_entry(struct file_list *flist,
 495                                               unsigned short flags, int f)
 496 {
 497         static time_t modtime;
 498         static mode_t mode;
 499         static int64 dev;
 500         static dev_t rdev;
 501         static uint32 rdev_major;
 502         static uid_t uid;
 503         static gid_t gid;
 504         static char lastname[MAXPATHLEN], *lastdir;
 505         static int lastdir_depth, lastdir_len = -1;
 506         static unsigned int del_hier_name_len = 0;
 507         static int in_del_hier = 0;
 508         char thisname[MAXPATHLEN];
 509         unsigned int l1 = 0, l2 = 0;
 510         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 511         OFF_T file_length;
 512         char *basename, *dirname, *bp;
 513         struct file_struct *file;
 514
 515         if (!flist) {
 516                 modtime = 0, mode = 0;
 517                 dev = 0, rdev = makedev(0, 0);
 518                 rdev_major = 0;
 519                 uid = 0, gid = 0;
 520                 *lastname = '\0';
 521                 lastdir_len = -1;
 522                 in_del_hier = 0;
 523                 return NULL;
 524         }
 525
 526         if (flags & XMIT_SAME_NAME)
 527                 l1 = read_byte(f);
 528
 529         if (flags & XMIT_LONG_NAME)
 530                 l2 = read_int(f);
 531         else
 532                 l2 = read_byte(f);
 533
 534         if (l2 >= MAXPATHLEN - l1) {
 535                 rprintf(FERROR,
 536                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 537                         flags, l1, l2, safe_fname(lastname));
 538                 overflow_exit("receive_file_entry");
 539         }
 540
 541         strlcpy(thisname, lastname, l1 + 1);
 542         read_sbuf(f, &thisname[l1], l2);
 543         thisname[l1 + l2] = 0;
 544
 545         strlcpy(lastname, thisname, MAXPATHLEN);
 546
 547         clean_fname(thisname, 0);
 548
 549         if (sanitize_paths)
 550                 sanitize_path(thisname, thisname, "", 0);
 551
 552         if ((basename = strrchr(thisname, '/')) != NULL) {
 553                 dirname_len = ++basename - thisname; /* counts future '\0' */
 554                 if (lastdir_len == dirname_len - 1
 555                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 556                         dirname = lastdir;
 557                         dirname_len = 0; /* indicates no copy is needed */
 558                 } else
 559                         dirname = thisname;
 560         } else {
 561                 basename = thisname;
 562                 dirname = NULL;
 563                 dirname_len = 0;
 564         }
 565         basename_len = strlen(basename) + 1; /* count the '\0' */
 566
 567         file_length = read_longint(f);
 568         if (!(flags & XMIT_SAME_TIME))
 569                 modtime = (time_t)read_int(f);
 570         if (!(flags & XMIT_SAME_MODE))
 571                 mode = from_wire_mode(read_int(f));
 572
 573         if (preserve_uid && !(flags & XMIT_SAME_UID))
 574                 uid = (uid_t)read_int(f);
 575         if (preserve_gid && !(flags & XMIT_SAME_GID))
 576                 gid = (gid_t)read_int(f);
 577
 578         if (preserve_devices) {
 579                 if (protocol_version < 28) {
 580                         if (IS_DEVICE(mode)) {
 581                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 582                                         rdev = (dev_t)read_int(f);
 583                         } else
 584                                 rdev = makedev(0, 0);
 585                 } else if (IS_DEVICE(mode)) {
 586                         uint32 rdev_minor;
 587                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 588                                 rdev_major = read_int(f);
 589                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 590                                 rdev_minor = read_byte(f);
 591                         else
 592                                 rdev_minor = read_int(f);
 593                         rdev = makedev(rdev_major, rdev_minor);
 594                 }
 595         }
 596
 597 #ifdef SUPPORT_LINKS
 598         if (preserve_links && S_ISLNK(mode)) {
 599                 linkname_len = read_int(f) + 1; /* count the '\0' */
 600                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 601                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 602                                 linkname_len - 1);
 603                         overflow_exit("receive_file_entry");
 604                 }
 605         }
 606         else
 607 #endif
 608                 linkname_len = 0;
 609
 610         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 611
 612         alloc_len = file_struct_len + dirname_len + basename_len
 613                   + linkname_len + sum_len;
 614         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 615
 616         file = (struct file_struct *)bp;
 617         memset(bp, 0, file_struct_len);
 618         bp += file_struct_len;
 619
 620         file->flags = 0;
 621         file->modtime = modtime;
 622         file->length = file_length;
 623         file->mode = mode;
 624         file->uid = uid;
 625         file->gid = gid;
 626
 627         if (dirname_len) {
 628                 file->dirname = lastdir = bp;
 629                 lastdir_len = dirname_len - 1;
 630                 memcpy(bp, dirname, dirname_len - 1);
 631                 bp += dirname_len;
 632                 bp[-1] = '\0';
 633                 lastdir_depth = count_dir_elements(lastdir);
 634                 file->dir.depth = lastdir_depth + 1;
 635         } else if (dirname) {
 636                 file->dirname = dirname; /* we're reusing lastname */
 637                 file->dir.depth = lastdir_depth + 1;
 638         } else
 639                 file->dir.depth = 1;
 640
 641         if (S_ISDIR(mode)) {
 642                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 643                         file->dir.depth--;
 644                 if (flags & XMIT_TOP_DIR) {
 645                         in_del_hier = recurse;
 646                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 647                         if (relative_paths && del_hier_name_len > 2
 648                             && basename_len == 1+1 && *basename == '.')
 649                                 del_hier_name_len -= 2;
 650                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 651                 } else if (in_del_hier) {
 652                         if (!relative_paths || !del_hier_name_len
 653                          || (l1 >= del_hier_name_len
 654                           && thisname[del_hier_name_len] == '/'))
 655                                 file->flags |= FLAG_DEL_HERE;
 656                         else
 657                                 in_del_hier = 0;
 658                 }
 659         }
 660
 661         file->basename = bp;
 662         memcpy(bp, basename, basename_len);
 663         bp += basename_len;
 664
 665         if (preserve_devices && IS_DEVICE(mode))
 666                 file->u.rdev = rdev;
 667
 668 #ifdef SUPPORT_LINKS
 669         if (linkname_len) {
 670                 file->u.link = bp;
 671                 read_sbuf(f, bp, linkname_len - 1);
 672                 if (sanitize_paths)
 673                         sanitize_path(bp, bp, "", lastdir_depth);
 674                 bp += linkname_len;
 675         }
 676 #endif
 677
 678 #ifdef SUPPORT_HARD_LINKS
 679         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 680                 flags |= XMIT_HAS_IDEV_DATA;
 681         if (flags & XMIT_HAS_IDEV_DATA) {
 682                 int64 inode;
 683                 if (protocol_version < 26) {
 684                         dev = read_int(f);
 685                         inode = read_int(f);
 686                 } else {
 687                         if (!(flags & XMIT_SAME_DEV))
 688                                 dev = read_longint(f);
 689                         inode = read_longint(f);
 690                 }
 691                 if (flist->hlink_pool) {
 692                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 693                             struct idev, 1, "inode_table");
 694                         file->F_INODE = inode;
 695                         file->F_DEV = dev;
 696                 }
 697         }
 698 #endif
 699
 700         if (always_checksum && (sum_len || protocol_version < 28)) {
 701                 char *sum;
 702                 if (sum_len) {
 703                         file->u.sum = sum = bp;
 704                         /*bp += sum_len;*/
 705                 } else {
 706                         /* Prior to 28, we get a useless set of nulls. */
 707                         sum = empty_sum;
 708                 }
 709                 read_buf(f, sum, checksum_len);
 710         }
 711
 712         if (!preserve_perms) {
 713                 /* set an appropriate set of permissions based on original
 714                  * permissions and umask. This emulates what GNU cp does */
 715                 file->mode &= ~orig_umask;
 716         }
 717
 718         return file;
 719 }
 720
 721 /**
 722  * Create a file_struct for a named file by reading its stat()
 723  * information and performing extensive checks against global
 724  * options.
 725  *
 726  * @return the new file, or NULL if there was an error or this file
 727  * should be excluded.
 728  *
 729  * @todo There is a small optimization opportunity here to avoid
 730  * stat()ing the file in some circumstances, which has a certain cost.
 731  * We are called immediately after doing readdir(), and so we may
 732  * already know the d_type of the file.  We could for example avoid
 733  * statting directories if we're not recursing, but this is not a very
 734  * important case.  Some systems may not have d_type.
 735  **/
 736 struct file_struct *make_file(char *fname, struct file_list *flist,
 737                               int filter_level)
 738 {
 739         static char *lastdir;
 740         static int lastdir_len = -1;
 741         struct file_struct *file;
 742         STRUCT_STAT st;
 743         char sum[SUM_LENGTH];
 744         char thisname[MAXPATHLEN];
 745         char linkname[MAXPATHLEN];
 746         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 747         char *basename, *dirname, *bp;
 748         unsigned short flags = 0;
 749
 750         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 751                 lastdir_len = -1;
 752
 753         if (strlcpy(thisname, fname, sizeof thisname)
 754             >= sizeof thisname - flist_dir_len) {
 755                 rprintf(FINFO, "skipping overly long name: %s\n",
 756                         safe_fname(fname));
 757                 return NULL;
 758         }
 759         clean_fname(thisname, 0);
 760         if (sanitize_paths)
 761                 sanitize_path(thisname, thisname, "", 0);
 762
 763         memset(sum, 0, SUM_LENGTH);
 764
 765         if (readlink_stat(thisname, &st, linkname) != 0) {
 766                 int save_errno = errno;
 767                 /* See if file is excluded before reporting an error. */
 768                 if (filter_level != NO_FILTERS
 769                     && is_excluded(thisname, 0, filter_level))
 770                         return NULL;
 771                 if (save_errno == ENOENT) {
 772 #ifdef SUPPORT_LINKS
 773                         /* Avoid "vanished" error if symlink points nowhere. */
 774                         if (copy_links && do_lstat(thisname, &st) == 0
 775                             && S_ISLNK(st.st_mode)) {
 776                                 io_error |= IOERR_GENERAL;
 777                                 rprintf(FERROR, "symlink has no referent: %s\n",
 778                                         full_fname(thisname));
 779                         } else
 780 #endif
 781                         {
 782                                 enum logcode c = am_daemon && protocol_version < 28
 783                                     ? FERROR : FINFO;
 784                                 io_error |= IOERR_VANISHED;
 785                                 rprintf(c, "file has vanished: %s\n",
 786                                         full_fname(thisname));
 787                         }
 788                 } else {
 789                         io_error |= IOERR_GENERAL;
 790                         rsyserr(FERROR, save_errno, "readlink %s failed",
 791                                 full_fname(thisname));
 792                 }
 793                 return NULL;
 794         }
 795
 796         /* backup.c calls us with filter_level set to NO_FILTERS. */
 797         if (filter_level == NO_FILTERS)
 798                 goto skip_filters;
 799
 800         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 801                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
 802                 return NULL;
 803         }
 804
 805         /* We only care about directories because we need to avoid recursing
 806          * into a mount-point directory, not to avoid copying a symlinked
 807          * file if -L (or similar) was specified. */
 808         if (one_file_system && st.st_dev != filesystem_dev
 809             && S_ISDIR(st.st_mode))
 810                 flags |= FLAG_MOUNT_POINT;
 811
 812         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 813                 return NULL;
 814
 815         if (lp_ignore_nonreadable(module_id)) {
 816 #ifdef SUPPORT_LINKS
 817                 if (!S_ISLNK(st.st_mode))
 818 #endif
 819                         if (access(thisname, R_OK) != 0)
 820                                 return NULL;
 821         }
 822
 823     skip_filters:
 824
 825         if (verbose > 2) {
 826                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 827                         who_am_i(), safe_fname(thisname), filter_level);
 828         }
 829
 830         if ((basename = strrchr(thisname, '/')) != NULL) {
 831                 dirname_len = ++basename - thisname; /* counts future '\0' */
 832                 if (lastdir_len == dirname_len - 1
 833                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 834                         dirname = lastdir;
 835                         dirname_len = 0; /* indicates no copy is needed */
 836                 } else
 837                         dirname = thisname;
 838         } else {
 839                 basename = thisname;
 840                 dirname = NULL;
 841                 dirname_len = 0;
 842         }
 843         basename_len = strlen(basename) + 1; /* count the '\0' */
 844
 845 #ifdef SUPPORT_LINKS
 846         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 847 #else
 848         linkname_len = 0;
 849 #endif
 850
 851         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 852                 ? MD4_SUM_LENGTH : 0;
 853
 854         alloc_len = file_struct_len + dirname_len + basename_len
 855             + linkname_len + sum_len;
 856         if (flist) {
 857                 bp = pool_alloc(flist->file_pool, alloc_len,
 858                     "receive_file_entry");
 859         } else {
 860                 if (!(bp = new_array(char, alloc_len)))
 861                         out_of_memory("receive_file_entry");
 862         }
 863
 864         file = (struct file_struct *)bp;
 865         memset(bp, 0, file_struct_len);
 866         bp += file_struct_len;
 867
 868         file->flags = flags;
 869         file->modtime = st.st_mtime;
 870         file->length = st.st_size;
 871         if (chmod_modes && am_sender && (S_ISREG(st.st_mode) || S_ISDIR(st.st_mode)))
 872                 file->mode = tweak_mode(st.st_mode, chmod_modes);
 873         else
 874                 file->mode = st.st_mode;
 875         file->uid = st.st_uid;
 876         file->gid = st.st_gid;
 877
 878 #ifdef SUPPORT_HARD_LINKS
 879         if (flist && flist->hlink_pool) {
 880                 if (protocol_version < 28) {
 881                         if (S_ISREG(st.st_mode))
 882                                 file->link_u.idev = pool_talloc(
 883                                     flist->hlink_pool, struct idev, 1,
 884                                     "inode_table");
 885                 } else {
 886                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 887                                 file->link_u.idev = pool_talloc(
 888                                     flist->hlink_pool, struct idev, 1,
 889                                     "inode_table");
 890                 }
 891         }
 892         if (file->link_u.idev) {
 893                 file->F_DEV = st.st_dev;
 894                 file->F_INODE = st.st_ino;
 895         }
 896 #endif
 897
 898         if (dirname_len) {
 899                 file->dirname = lastdir = bp;
 900                 lastdir_len = dirname_len - 1;
 901                 memcpy(bp, dirname, dirname_len - 1);
 902                 bp += dirname_len;
 903                 bp[-1] = '\0';
 904         } else if (dirname)
 905                 file->dirname = dirname;
 906
 907         file->basename = bp;
 908         memcpy(bp, basename, basename_len);
 909         bp += basename_len;
 910
 911 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 912         if (preserve_devices && IS_DEVICE(st.st_mode))
 913                 file->u.rdev = st.st_rdev;
 914 #endif
 915
 916 #ifdef SUPPORT_LINKS
 917         if (linkname_len) {
 918                 file->u.link = bp;
 919                 memcpy(bp, linkname, linkname_len);
 920                 bp += linkname_len;
 921         }
 922 #endif
 923
 924         if (sum_len) {
 925                 file->u.sum = bp;
 926                 file_checksum(thisname, bp, st.st_size);
 927                 /*bp += sum_len;*/
 928         }
 929
 930         file->dir.root = flist_dir;
 931
 932         /* This code is only used by the receiver when it is building
 933          * a list of files for a delete pass. */
 934         if (keep_dirlinks && linkname_len && flist) {
 935                 STRUCT_STAT st2;
 936                 int save_mode = file->mode;
 937                 file->mode = S_IFDIR; /* find a directory w/our name */
 938                 if (flist_find(the_file_list, file) >= 0
 939                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 940                         file->modtime = st2.st_mtime;
 941                         file->length = st2.st_size;
 942                         file->mode = st2.st_mode;
 943                         file->uid = st2.st_uid;
 944                         file->gid = st2.st_gid;
 945                         file->u.link = NULL;
 946                 } else
 947                         file->mode = save_mode;
 948         }
 949
 950         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 951                 stats.total_size += st.st_size;
 952
 953         return file;
 954 }
 955
 956 static struct file_struct *send_file_name(int f, struct file_list *flist,
 957                                           char *fname, unsigned short base_flags)
 958 {
 959         struct file_struct *file;
 960
 961         file = make_file(fname, flist, f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 962         if (!file)
 963                 return NULL;
 964
 965         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 966
 967         flist_expand(flist);
 968
 969         if (file->basename[0]) {
 970                 flist->files[flist->count++] = file;
 971                 send_file_entry(file, f, base_flags);
 972         }
 973         return file;
 974 }
 975
 976 static void send_if_directory(int f, struct file_list *flist,
 977                               struct file_struct *file,
 978                               char *fbuf, unsigned int ol)
 979 {
 980         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 981
 982         if (S_ISDIR(file->mode)
 983             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 984                 void *save_filters;
 985                 unsigned int len = strlen(fbuf);
 986                 if (len > 1 && fbuf[len-1] == '/')
 987                         fbuf[--len] = '\0';
 988                 if (len >= MAXPATHLEN - 1) {
 989                         io_error |= IOERR_GENERAL;
 990                         rprintf(FERROR, "skipping long-named directory: %s\n",
 991                                 full_fname(fbuf));
 992                         return;
 993                 }
 994                 save_filters = push_local_filters(fbuf, len);
 995                 send_directory(f, flist, fbuf, len);
 996                 pop_local_filters(save_filters);
 997                 fbuf[ol] = '\0';
 998                 if (is_dot_dir)
 999                         fbuf[ol-1] = '.';
1000         }
1001 }
1002
1003 /* This function is normally called by the sender, but the receiving side also
1004  * calls it from get_dirlist() with f set to -1 so that we just construct the
1005  * file list in memory without sending it over the wire.  Also, get_dirlist()
1006  * might call this with f set to -2, which also indicates that local filter
1007  * rules should be ignored. */
1008 static void send_directory(int f, struct file_list *flist,
1009                            char *fbuf, int len)
1010 {
1011         struct dirent *di;
1012         unsigned remainder;
1013         char *p;
1014         DIR *d;
1015         int start = flist->count;
1016
1017         if (!(d = opendir(fbuf))) {
1018                 io_error |= IOERR_GENERAL;
1019                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1020                 return;
1021         }
1022
1023         p = fbuf + len;
1024         if (len != 1 || *fbuf != '/')
1025                 *p++ = '/';
1026         *p = '\0';
1027         remainder = MAXPATHLEN - (p - fbuf);
1028
1029         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1030                 char *dname = d_name(di);
1031                 if (dname[0] == '.' && (dname[1] == '\0'
1032                     || (dname[1] == '.' && dname[2] == '\0')))
1033                         continue;
1034                 if (strlcpy(p, dname, remainder) < remainder)
1035                         send_file_name(f, flist, fbuf, 0);
1036                 else {
1037                         io_error |= IOERR_GENERAL;
1038                         rprintf(FINFO,
1039                                 "cannot send long-named file %s\n",
1040                                 full_fname(fbuf));
1041                 }
1042         }
1043
1044         fbuf[len] = '\0';
1045
1046         if (errno) {
1047                 io_error |= IOERR_GENERAL;
1048                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1049         }
1050
1051         closedir(d);
1052
1053         if (recurse) {
1054                 int i, end = flist->count - 1;
1055                 for (i = start; i <= end; i++)
1056                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1057         }
1058 }
1059
1060 struct file_list *send_file_list(int f, int argc, char *argv[])
1061 {
1062         int len;
1063         STRUCT_STAT st;
1064         char *p, *dir, olddir[sizeof curr_dir];
1065         char lastpath[MAXPATHLEN] = "";
1066         struct file_list *flist;
1067         struct timeval start_tv, end_tv;
1068         int64 start_write;
1069         int use_ff_fd = 0;
1070
1071         if (show_filelist_p())
1072                 start_filelist_progress("building file list");
1073
1074         start_write = stats.total_written;
1075         gettimeofday(&start_tv, NULL);
1076
1077         flist = flist_new(WITH_HLINK, "send_file_list");
1078
1079         io_start_buffering_out();
1080         if (filesfrom_fd >= 0) {
1081                 if (argv[0] && !push_dir(argv[0])) {
1082                         rsyserr(FERROR, errno, "push_dir %s failed",
1083                                 full_fname(argv[0]));
1084                         exit_cleanup(RERR_FILESELECT);
1085                 }
1086                 use_ff_fd = 1;
1087         }
1088
1089         while (1) {
1090                 char fbuf[MAXPATHLEN];
1091                 char *fn;
1092                 int is_dot_dir;
1093
1094                 if (use_ff_fd) {
1095                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1096                                 break;
1097                         sanitize_path(fbuf, fbuf, "", 0);
1098                 } else {
1099                         if (argc-- == 0)
1100                                 break;
1101                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1102                         if (sanitize_paths)
1103                                 sanitize_path(fbuf, fbuf, "", 0);
1104                 }
1105
1106                 len = strlen(fbuf);
1107                 if (!len || fbuf[len - 1] == '/') {
1108                         if (len == 2 && fbuf[0] == '.') {
1109                                 /* Turn "./" into just "." rather than "./." */
1110                                 fbuf[1] = '\0';
1111                         } else {
1112                                 if (len + 1 >= MAXPATHLEN)
1113                                         overflow_exit("send_file_list");
1114                                 fbuf[len++] = '.';
1115                                 fbuf[len] = '\0';
1116                         }
1117                         is_dot_dir = 1;
1118                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1119                     && (len == 2 || fbuf[len-3] == '/')) {
1120                         if (len + 2 >= MAXPATHLEN)
1121                                 overflow_exit("send_file_list");
1122                         fbuf[len++] = '/';
1123                         fbuf[len++] = '.';
1124                         fbuf[len] = '\0';
1125                         is_dot_dir = 1;
1126                 } else {
1127                         is_dot_dir = fbuf[len-1] == '.'
1128                                    && (len == 1 || fbuf[len-2] == '/');
1129                 }
1130
1131                 if (link_stat(fbuf, &st, keep_dirlinks) != 0) {
1132                         io_error |= IOERR_GENERAL;
1133                         rsyserr(FERROR, errno, "link_stat %s failed",
1134                                 full_fname(fbuf));
1135                         continue;
1136                 }
1137
1138                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1139                         rprintf(FINFO, "skipping directory %s\n",
1140                                 safe_fname(fbuf));
1141                         continue;
1142                 }
1143
1144                 dir = NULL;
1145                 olddir[0] = '\0';
1146
1147                 if (!relative_paths) {
1148                         p = strrchr(fbuf, '/');
1149                         if (p) {
1150                                 *p = '\0';
1151                                 if (p == fbuf)
1152                                         dir = "/";
1153                                 else
1154                                         dir = fbuf;
1155                                 len -= p - fbuf + 1;
1156                                 fn = p + 1;
1157                         } else
1158                                 fn = fbuf;
1159                 } else if ((p = strstr(fbuf, "/./")) != NULL) {
1160                         *p = '\0';
1161                         if (p == fbuf)
1162                                 dir = "/";
1163                         else
1164                                 dir = fbuf;
1165                         len -= p - fbuf + 3;
1166                         fn = p + 3;
1167                 } else
1168                         fn = fbuf;
1169
1170                 if (!*fn) {
1171                         len = 1;
1172                         fn = ".";
1173                 }
1174
1175                 if (dir && *dir) {
1176                         static char *lastdir;
1177                         static int lastdir_len;
1178
1179                         strlcpy(olddir, curr_dir, sizeof olddir);
1180
1181                         if (!push_dir(dir)) {
1182                                 io_error |= IOERR_GENERAL;
1183                                 rsyserr(FERROR, errno, "push_dir %s failed",
1184                                         full_fname(dir));
1185                                 continue;
1186                         }
1187
1188                         if (lastdir && strcmp(lastdir, dir) == 0) {
1189                                 flist_dir = lastdir;
1190                                 flist_dir_len = lastdir_len;
1191                         } else {
1192                                 flist_dir = lastdir = strdup(dir);
1193                                 flist_dir_len = lastdir_len = strlen(dir);
1194                         }
1195                 }
1196
1197                 if (fn != fbuf)
1198                         memmove(fbuf, fn, len + 1);
1199
1200                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1201                         /* Send the implied directories at the start of the
1202                          * source spec, so we get their permissions right. */
1203                         char *lp = lastpath, *slash = fbuf;
1204                         *p = '\0';
1205                         /* Skip any initial directories in our path that we
1206                          * have in common with lastpath. */
1207                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1208                                 if (*fn == '/')
1209                                         slash = fn;
1210                         }
1211                         *p = '/';
1212                         if (fn != p || (*lp && *lp != '/')) {
1213                                 int save_copy_links = copy_links;
1214                                 int save_xfer_dirs = xfer_dirs;
1215                                 copy_links = copy_unsafe_links;
1216                                 xfer_dirs = 1;
1217                                 while ((slash = strchr(slash+1, '/')) != 0) {
1218                                         *slash = '\0';
1219                                         send_file_name(f, flist, fbuf, 0);
1220                                         *slash = '/';
1221                                 }
1222                                 copy_links = save_copy_links;
1223                                 xfer_dirs = save_xfer_dirs;
1224                                 *p = '\0';
1225                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1226                                 *p = '/';
1227                         }
1228                 }
1229
1230                 if (one_file_system)
1231                         filesystem_dev = st.st_dev;
1232
1233                 if (recurse || (xfer_dirs && is_dot_dir)) {
1234                         struct file_struct *file;
1235                         if ((file = send_file_name(f, flist, fbuf, XMIT_TOP_DIR)))
1236                                 send_if_directory(f, flist, file, fbuf, len);
1237                 } else
1238                         send_file_name(f, flist, fbuf, 0);
1239
1240                 if (olddir[0]) {
1241                         flist_dir = NULL;
1242                         flist_dir_len = 0;
1243                         if (!pop_dir(olddir)) {
1244                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1245                                         full_fname(olddir));
1246                                 exit_cleanup(RERR_FILESELECT);
1247                         }
1248                 }
1249         }
1250
1251         gettimeofday(&end_tv, NULL);
1252         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1253                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1254         if (stats.flist_buildtime == 0)
1255                 stats.flist_buildtime = 1;
1256         start_tv = end_tv;
1257
1258         send_file_entry(NULL, f, 0);
1259
1260         if (show_filelist_p())
1261                 finish_filelist_progress(flist);
1262
1263         gettimeofday(&end_tv, NULL);
1264         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1265                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1266
1267         if (flist->hlink_pool) {
1268                 pool_destroy(flist->hlink_pool);
1269                 flist->hlink_pool = NULL;
1270         }
1271
1272         /* Sort the list without removing any duplicates.  This allows the
1273          * receiving side to ask for any name they like, which gives us the
1274          * flexibility to change the way we unduplicate names in the future
1275          * without causing a compatibility problem with older versions. */
1276         clean_flist(flist, 0, 0);
1277
1278         /* Now send the uid/gid list. This was introduced in
1279          * protocol version 15 */
1280         send_uid_list(f);
1281
1282         /* send the io_error flag */
1283         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1284
1285         io_end_buffering();
1286         stats.flist_size = stats.total_written - start_write;
1287         stats.num_files = flist->count;
1288
1289         if (verbose > 3)
1290                 output_flist(flist);
1291
1292         if (verbose > 2)
1293                 rprintf(FINFO, "send_file_list done\n");
1294
1295         return flist;
1296 }
1297
1298 struct file_list *recv_file_list(int f)
1299 {
1300         struct file_list *flist;
1301         unsigned short flags;
1302         int64 start_read;
1303
1304         if (show_filelist_p())
1305                 start_filelist_progress("receiving file list");
1306
1307         start_read = stats.total_read;
1308
1309         flist = flist_new(WITH_HLINK, "recv_file_list");
1310
1311         flist->count = 0;
1312         flist->malloced = 1000;
1313         flist->files = new_array(struct file_struct *, flist->malloced);
1314         if (!flist->files)
1315                 goto oom;
1316
1317
1318         while ((flags = read_byte(f)) != 0) {
1319                 struct file_struct *file;
1320
1321                 flist_expand(flist);
1322
1323                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1324                         flags |= read_byte(f) << 8;
1325                 file = receive_file_entry(flist, flags, f);
1326
1327                 if (S_ISREG(file->mode))
1328                         stats.total_size += file->length;
1329
1330                 flist->files[flist->count++] = file;
1331
1332                 maybe_emit_filelist_progress(flist->count);
1333
1334                 if (verbose > 2) {
1335                         rprintf(FINFO, "recv_file_name(%s)\n",
1336                                 safe_fname(f_name(file)));
1337                 }
1338         }
1339         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1340
1341         if (verbose > 2)
1342                 rprintf(FINFO, "received %d names\n", flist->count);
1343
1344         if (show_filelist_p())
1345                 finish_filelist_progress(flist);
1346
1347         clean_flist(flist, relative_paths, 1);
1348
1349         if (f >= 0) {
1350                 /* Now send the uid/gid list. This was introduced in
1351                  * protocol version 15 */
1352                 recv_uid_list(f, flist);
1353
1354                 /* Recv the io_error flag */
1355                 if (lp_ignore_errors(module_id) || ignore_errors)
1356                         read_int(f);
1357                 else
1358                         io_error |= read_int(f);
1359         }
1360
1361         if (verbose > 3)
1362                 output_flist(flist);
1363
1364         if (list_only) {
1365                 int i;
1366                 for (i = 0; i < flist->count; i++)
1367                         list_file_entry(flist->files[i]);
1368         }
1369
1370         if (verbose > 2)
1371                 rprintf(FINFO, "recv_file_list done\n");
1372
1373         stats.flist_size = stats.total_read - start_read;
1374         stats.num_files = flist->count;
1375
1376         return flist;
1377
1378 oom:
1379         out_of_memory("recv_file_list");
1380         return NULL;            /* not reached */
1381 }
1382
1383 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1384 {
1385         return f_name_cmp(*file1, *file2);
1386 }
1387
1388 /* Search for an identically-named item in the file list.  Note that the
1389  * items must agree in their directory-ness, or no match is returned. */
1390 int flist_find(struct file_list *flist, struct file_struct *f)
1391 {
1392         int low = flist->low, high = flist->high;
1393         int ret, mid, mid_up;
1394
1395         while (low <= high) {
1396                 mid = (low + high) / 2;
1397                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1398                 if (mid_up <= high)
1399                         ret = f_name_cmp(flist->files[mid_up], f);
1400                 else
1401                         ret = 1;
1402                 if (ret == 0) {
1403                         if (protocol_version < 29
1404                             && S_ISDIR(flist->files[mid_up]->mode)
1405                             != S_ISDIR(f->mode))
1406                                 return -1;
1407                         return mid_up;
1408                 }
1409                 if (ret > 0)
1410                         high = mid - 1;
1411                 else
1412                         low = mid_up + 1;
1413         }
1414         return -1;
1415 }
1416
1417 /*
1418  * Free up any resources a file_struct has allocated
1419  * and clear the file.
1420  */
1421 void clear_file(int i, struct file_list *flist)
1422 {
1423         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1424                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1425         memset(flist->files[i], 0, file_struct_len);
1426 }
1427
1428 /*
1429  * allocate a new file list
1430  */
1431 struct file_list *flist_new(int with_hlink, char *msg)
1432 {
1433         struct file_list *flist;
1434
1435         flist = new(struct file_list);
1436         if (!flist)
1437                 out_of_memory(msg);
1438
1439         memset(flist, 0, sizeof (struct file_list));
1440
1441         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1442             out_of_memory, POOL_INTERN)))
1443                 out_of_memory(msg);
1444
1445 #ifdef SUPPORT_HARD_LINKS
1446         if (with_hlink && preserve_hard_links) {
1447                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1448                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1449                         out_of_memory(msg);
1450         }
1451 #endif
1452
1453         return flist;
1454 }
1455
1456 /*
1457  * free up all elements in a flist
1458  */
1459 void flist_free(struct file_list *flist)
1460 {
1461         pool_destroy(flist->file_pool);
1462         pool_destroy(flist->hlink_pool);
1463         free(flist->files);
1464         free(flist);
1465 }
1466
1467 /*
1468  * This routine ensures we don't have any duplicate names in our file list.
1469  * duplicate names can cause corruption because of the pipelining
1470  */
1471 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1472 {
1473         int i, prev_i = 0;
1474
1475         if (!flist)
1476                 return;
1477         if (flist->count == 0) {
1478                 flist->high = -1;
1479                 return;
1480         }
1481
1482         sorting_flist = flist;
1483         qsort(flist->files, flist->count,
1484             sizeof flist->files[0], (int (*)())file_compare);
1485         sorting_flist = NULL;
1486
1487         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1488                 if (flist->files[i]->basename) {
1489                         prev_i = i;
1490                         break;
1491                 }
1492         }
1493         flist->low = prev_i;
1494         while (++i < flist->count) {
1495                 int j;
1496                 struct file_struct *file = flist->files[i];
1497
1498                 if (!file->basename)
1499                         continue;
1500                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1501                         j = prev_i;
1502                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1503                         int save_mode = file->mode;
1504                         /* Make sure that this directory doesn't duplicate a
1505                          * non-directory earlier in the list. */
1506                         flist->high = prev_i;
1507                         file->mode = S_IFREG;
1508                         j = flist_find(flist, file);
1509                         file->mode = save_mode;
1510                 } else
1511                         j = -1;
1512                 if (j >= 0) {
1513                         struct file_struct *fp = flist->files[j];
1514                         int keep, drop;
1515                         /* If one is a dir and the other is not, we want to
1516                          * keep the dir because it might have contents in the
1517                          * list. */
1518                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1519                                 if (S_ISDIR(file->mode))
1520                                         keep = i, drop = j;
1521                                 else
1522                                         keep = j, drop = i;
1523                         } else
1524                                 keep = j, drop = i;
1525                         if (verbose > 1 && !am_server) {
1526                                 rprintf(FINFO,
1527                                         "removing duplicate name %s from file list (%d)\n",
1528                                         safe_fname(f_name(file)), drop);
1529                         }
1530                         /* Make sure that if we unduplicate '.', that we don't
1531                          * lose track of a user-specified top directory. */
1532                         flist->files[keep]->flags |= flist->files[drop]->flags
1533                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1534
1535                         clear_file(drop, flist);
1536
1537                         if (keep == i) {
1538                                 if (flist->low == drop) {
1539                                         for (j = drop + 1;
1540                                              j < i && !flist->files[j]->basename;
1541                                              j++) {}
1542                                         flist->low = j;
1543                                 }
1544                                 prev_i = i;
1545                         }
1546                 } else
1547                         prev_i = i;
1548         }
1549         flist->high = no_dups ? prev_i : flist->count - 1;
1550
1551         if (strip_root) {
1552                 /* We need to strip off the leading slashes for relative
1553                  * paths, but this must be done _after_ the sorting phase. */
1554                 for (i = flist->low; i <= flist->high; i++) {
1555                         struct file_struct *file = flist->files[i];
1556
1557                         if (!file->dirname)
1558                                 continue;
1559                         if (*file->dirname == '/') {
1560                                 char *s = file->dirname + 1;
1561                                 while (*s == '/') s++;
1562                                 memmove(file->dirname, s, strlen(s) + 1);
1563                         }
1564
1565                         if (!*file->dirname)
1566                                 file->dirname = NULL;
1567                 }
1568         }
1569 }
1570
1571 static void output_flist(struct file_list *flist)
1572 {
1573         char uidbuf[16], gidbuf[16], depthbuf[16];
1574         struct file_struct *file;
1575         const char *who = who_am_i();
1576         int i;
1577
1578         for (i = 0; i < flist->count; i++) {
1579                 file = flist->files[i];
1580                 if ((am_root || am_sender) && preserve_uid)
1581                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1582                 else
1583                         *uidbuf = '\0';
1584                 if (preserve_gid && file->gid != GID_NONE)
1585                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1586                 else
1587                         *gidbuf = '\0';
1588                 if (!am_sender)
1589                         sprintf(depthbuf, "%d", file->dir.depth);
1590                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1591                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1592                         file->dirname ? safe_fname(file->dirname) : "",
1593                         file->dirname ? "/" : "", NS(file->basename),
1594                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1595                         (double)file->length, uidbuf, gidbuf, file->flags);
1596         }
1597 }
1598
1599 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1600 enum fnc_type { t_PATH, t_ITEM };
1601
1602 /* Compare the names of two file_struct entities, similar to how strcmp()
1603  * would do if it were operating on the joined strings.
1604  *
1605  * Some differences beginning with protocol_version 29: (1) directory names
1606  * are compared with an assumed trailing slash so that they compare in a
1607  * way that would cause them to sort immediately prior to any content they
1608  * may have; (2) a directory of any name compares after a non-directory of
1609  * any name at the same depth; (3) a directory with name "." compares prior
1610  * to anything else.  These changes mean that a directory and a non-dir
1611  * with the same name will not compare as equal (protocol_version >= 29).
1612  *
1613  * The dirname component can be an empty string, but the basename component
1614  * cannot (and never is in the current codebase).  The basename component
1615  * may be NULL (for a removed item), in which case it is considered to be
1616  * after any existing item. */
1617 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1618 {
1619         int dif;
1620         const uchar *c1, *c2;
1621         enum fnc_state state1, state2;
1622         enum fnc_type type1, type2;
1623         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1624
1625         if (!f1 || !f1->basename) {
1626                 if (!f2 || !f2->basename)
1627                         return 0;
1628                 return -1;
1629         }
1630         if (!f2 || !f2->basename)
1631                 return 1;
1632
1633         c1 = (uchar*)f1->dirname;
1634         c2 = (uchar*)f2->dirname;
1635         if (c1 == c2)
1636                 c1 = c2 = NULL;
1637         if (!c1) {
1638                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1639                 c1 = (uchar*)f1->basename;
1640                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1641                         type1 = t_ITEM;
1642                         state1 = s_TRAILING;
1643                         c1 = (uchar*)"";
1644                 } else
1645                         state1 = s_BASE;
1646         } else if (!*c1) {
1647                 type1 = t_path;
1648                 state1 = s_SLASH;
1649                 c1 = (uchar*)"/";
1650         } else {
1651                 type1 = t_path;
1652                 state1 = s_DIR;
1653         }
1654         if (!c2) {
1655                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1656                 c2 = (uchar*)f2->basename;
1657                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1658                         type2 = t_ITEM;
1659                         state2 = s_TRAILING;
1660                         c2 = (uchar*)"";
1661                 } else
1662                         state2 = s_BASE;
1663         } else if (!*c2) {
1664                 type2 = t_path;
1665                 state2 = s_SLASH;
1666                 c2 = (uchar*)"/";
1667         } else {
1668                 type2 = t_path;
1669                 state2 = s_DIR;
1670         }
1671
1672         if (type1 != type2)
1673                 return type1 == t_PATH ? 1 : -1;
1674
1675         while (1) {
1676                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1677                         break;
1678                 if (!*c1) {
1679                         switch (state1) {
1680                         case s_DIR:
1681                                 state1 = s_SLASH;
1682                                 c1 = (uchar*)"/";
1683                                 break;
1684                         case s_SLASH:
1685                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1686                                 c1 = (uchar*)f1->basename;
1687                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1688                                         type1 = t_ITEM;
1689                                         state1 = s_TRAILING;
1690                                         c1 = (uchar*)"";
1691                                 } else
1692                                         state1 = s_BASE;
1693                                 break;
1694                         case s_BASE:
1695                                 state1 = s_TRAILING;
1696                                 if (type1 == t_PATH) {
1697                                         c1 = (uchar*)"/";
1698                                         break;
1699                                 }
1700                                 /* FALL THROUGH */
1701                         case s_TRAILING:
1702                                 type1 = t_ITEM;
1703                                 break;
1704                         }
1705                         if (*c2 && type1 != type2)
1706                                 return type1 == t_PATH ? 1 : -1;
1707                 }
1708                 if (!*c2) {
1709                         switch (state2) {
1710                         case s_DIR:
1711                                 state2 = s_SLASH;
1712                                 c2 = (uchar*)"/";
1713                                 break;
1714                         case s_SLASH:
1715                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1716                                 c2 = (uchar*)f2->basename;
1717                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1718                                         type2 = t_ITEM;
1719                                         state2 = s_TRAILING;
1720                                         c2 = (uchar*)"";
1721                                 } else
1722                                         state2 = s_BASE;
1723                                 break;
1724                         case s_BASE:
1725                                 state2 = s_TRAILING;
1726                                 if (type2 == t_PATH) {
1727                                         c2 = (uchar*)"/";
1728                                         break;
1729                                 }
1730                                 /* FALL THROUGH */
1731                         case s_TRAILING:
1732                                 if (!*c1)
1733                                         return 0;
1734                                 type2 = t_ITEM;
1735                                 break;
1736                         }
1737                         if (type1 != type2)
1738                                 return type1 == t_PATH ? 1 : -1;
1739                 }
1740         }
1741
1742         return dif;
1743 }
1744
1745 /* Return a copy of the full filename of a flist entry, using the indicated
1746  * buffer.  No size-checking is done because we checked the size when creating
1747  * the file_struct entry.
1748  */
1749 char *f_name_to(struct file_struct *f, char *fbuf)
1750 {
1751         if (!f || !f->basename)
1752                 return NULL;
1753
1754         if (f->dirname) {
1755                 int len = strlen(f->dirname);
1756                 memcpy(fbuf, f->dirname, len);
1757                 fbuf[len] = '/';
1758                 strcpy(fbuf + len + 1, f->basename);
1759         } else
1760                 strcpy(fbuf, f->basename);
1761         return fbuf;
1762 }
1763
1764 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1765 char *f_name(struct file_struct *f)
1766 {
1767         static char names[5][MAXPATHLEN];
1768         static unsigned int n;
1769
1770         n = (n + 1) % (sizeof names / sizeof names[0]);
1771
1772         return f_name_to(f, names[n]);
1773 }
1774
1775 /* Do a non-recursive scan of the named directory, possibly ignoring all
1776  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1777  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1778  * buffer (the functions we call will append names onto the end, but the old
1779  * dir value will be restored on exit). */
1780 struct file_list *get_dirlist(char *dirname, int dlen,
1781                               int ignore_filter_rules)
1782 {
1783         struct file_list *dirlist;
1784         char dirbuf[MAXPATHLEN];
1785         int save_recurse = recurse;
1786
1787         if (dlen < 0) {
1788                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1789                 if (dlen >= MAXPATHLEN)
1790                         return NULL;
1791                 dirname = dirbuf;
1792         }
1793
1794         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1795
1796         recurse = 0;
1797         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1798         recurse = save_recurse;
1799         if (do_progress)
1800                 flist_count_offset += dirlist->count;
1801
1802         clean_flist(dirlist, 0, 0);
1803
1804         if (verbose > 3)
1805                 output_flist(dirlist);
1806
1807         return dirlist;
1808 }