flist.c

   1 /*
   2  * Generate and receive file lists.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2002, 2003, 2004, 2005, 2006 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  22  */
  23
  24 #include "rsync.h"
  25
  26 extern int verbose;
  27 extern int list_only;
  28 extern int am_root;
  29 extern int am_server;
  30 extern int am_daemon;
  31 extern int am_sender;
  32 extern int do_progress;
  33 extern int always_checksum;
  34 extern int module_id;
  35 extern int ignore_errors;
  36 extern int numeric_ids;
  37 extern int recurse;
  38 extern int xfer_dirs;
  39 extern int filesfrom_fd;
  40 extern int one_file_system;
  41 extern int copy_dirlinks;
  42 extern int keep_dirlinks;
  43 extern int preserve_links;
  44 extern int preserve_hard_links;
  45 extern int preserve_devices;
  46 extern int preserve_specials;
  47 extern int preserve_uid;
  48 extern int preserve_gid;
  49 extern int relative_paths;
  50 extern int implied_dirs;
  51 extern int prune_empty_dirs;
  52 extern int copy_links;
  53 extern int copy_unsafe_links;
  54 extern int protocol_version;
  55 extern int sanitize_paths;
  56 extern struct stats stats;
  57 extern struct file_list *the_file_list;
  58
  59 extern char curr_dir[MAXPATHLEN];
  60
  61 extern struct chmod_mode_struct *chmod_modes;
  62
  63 extern struct filter_list_struct filter_list;
  64 extern struct filter_list_struct server_filter_list;
  65
  66 int io_error;
  67 int checksum_len;
  68 dev_t filesystem_dev; /* used to implement -x */
  69 unsigned int file_struct_len;
  70
  71 static char empty_sum[MD4_SUM_LENGTH];
  72 static int flist_count_offset;
  73
  74 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  75 static void output_flist(struct file_list *flist);
  76
  77 void init_flist(void)
  78 {
  79         struct file_struct f;
  80
  81         /* Figure out how big the file_struct is without trailing padding */
  82         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  83         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
  84 }
  85
  86 static int show_filelist_p(void)
  87 {
  88         return verbose && xfer_dirs && !am_server;
  89 }
  90
  91 static void start_filelist_progress(char *kind)
  92 {
  93         rprintf(FINFO, "%s ... ", kind);
  94         if (verbose > 1 || do_progress)
  95                 rprintf(FINFO, "\n");
  96         rflush(FINFO);
  97 }
  98
  99 static void emit_filelist_progress(int count)
 100 {
 101         rprintf(FINFO, " %d files...\r", count);
 102 }
 103
 104 static void maybe_emit_filelist_progress(int count)
 105 {
 106         if (do_progress && show_filelist_p() && (count % 100) == 0)
 107                 emit_filelist_progress(count);
 108 }
 109
 110 static void finish_filelist_progress(const struct file_list *flist)
 111 {
 112         if (do_progress) {
 113                 /* This overwrites the progress line */
 114                 rprintf(FINFO, "%d file%sto consider\n",
 115                         flist->count, flist->count == 1 ? " " : "s ");
 116         } else
 117                 rprintf(FINFO, "done\n");
 118 }
 119
 120 void show_flist_stats(void)
 121 {
 122         /* Nothing yet */
 123 }
 124
 125 static void list_file_entry(struct file_struct *f)
 126 {
 127         char permbuf[PERMSTRING_SIZE];
 128
 129         if (!f->basename) {
 130                 /* this can happen if duplicate names were removed */
 131                 return;
 132         }
 133
 134         permstring(permbuf, f->mode);
 135
 136 #ifdef SUPPORT_LINKS
 137         if (preserve_links && S_ISLNK(f->mode)) {
 138                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 139                         permbuf,
 140                         (double)f->length, timestring(f->modtime),
 141                         f_name(f, NULL), f->u.link);
 142         } else
 143 #endif
 144         {
 145                 rprintf(FINFO, "%s %11.0f %s %s\n",
 146                         permbuf,
 147                         (double)f->length, timestring(f->modtime),
 148                         f_name(f, NULL));
 149         }
 150 }
 151
 152 /* Stat either a symlink or its referent, depending on the settings of
 153  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 154  *
 155  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 156  * MAXPATHLEN chars) will be set to the symlink's target string.
 157  *
 158  * The stat structure pointed to by stp will contain information about the
 159  * link or the referent as appropriate, if they exist. */
 160 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 161 {
 162 #ifdef SUPPORT_LINKS
 163         if (copy_links)
 164                 return do_stat(path, stp);
 165         if (link_stat(path, stp, copy_dirlinks) < 0)
 166                 return -1;
 167         if (S_ISLNK(stp->st_mode)) {
 168                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 169                 if (llen < 0)
 170                         return -1;
 171                 linkbuf[llen] = '\0';
 172                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 173                         if (verbose > 1) {
 174                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 175                                         path, linkbuf);
 176                         }
 177                         return do_stat(path, stp);
 178                 }
 179         }
 180         return 0;
 181 #else
 182         return do_stat(path, stp);
 183 #endif
 184 }
 185
 186 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 187 {
 188 #ifdef SUPPORT_LINKS
 189         if (copy_links)
 190                 return do_stat(path, stp);
 191         if (do_lstat(path, stp) < 0)
 192                 return -1;
 193         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 194                 STRUCT_STAT st;
 195                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 196                         *stp = st;
 197         }
 198         return 0;
 199 #else
 200         return do_stat(path, stp);
 201 #endif
 202 }
 203
 204 /* This function is used to check if a file should be included/excluded
 205  * from the list of files based on its name and type etc.  The value of
 206  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 207 static int is_excluded(char *fname, int is_dir, int filter_level)
 208 {
 209 #if 0 /* This currently never happens, so avoid a useless compare. */
 210         if (filter_level == NO_FILTERS)
 211                 return 0;
 212 #endif
 213         if (fname) {
 214                 /* never exclude '.', even if somebody does --exclude '*' */
 215                 if (fname[0] == '.' && !fname[1])
 216                         return 0;
 217                 /* Handle the -R version of the '.' dir. */
 218                 if (fname[0] == '/') {
 219                         int len = strlen(fname);
 220                         if (fname[len-1] == '.' && fname[len-2] == '/')
 221                                 return 0;
 222                 }
 223         }
 224         if (server_filter_list.head
 225             && check_filter(&server_filter_list, fname, is_dir) < 0)
 226                 return 1;
 227         if (filter_level != ALL_FILTERS)
 228                 return 0;
 229         if (filter_list.head
 230             && check_filter(&filter_list, fname, is_dir) < 0)
 231                 return 1;
 232         return 0;
 233 }
 234
 235 static int to_wire_mode(mode_t mode)
 236 {
 237 #ifdef SUPPORT_LINKS
 238         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 239                 return (mode & ~(_S_IFMT)) | 0120000;
 240 #endif
 241         return (int)mode;
 242 }
 243
 244 static mode_t from_wire_mode(int mode)
 245 {
 246         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 247                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 248         return (mode_t)mode;
 249 }
 250
 251 static void send_directory(int f, struct file_list *flist,
 252                            char *fbuf, int len);
 253
 254 static char *flist_dir;
 255 static int flist_dir_len;
 256
 257
 258 /**
 259  * Make sure @p flist is big enough to hold at least @p flist->count
 260  * entries.
 261  **/
 262 void flist_expand(struct file_list *flist)
 263 {
 264         struct file_struct **new_ptr;
 265
 266         if (flist->count < flist->malloced)
 267                 return;
 268
 269         if (flist->malloced < FLIST_START)
 270                 flist->malloced = FLIST_START;
 271         else if (flist->malloced >= FLIST_LINEAR)
 272                 flist->malloced += FLIST_LINEAR;
 273         else
 274                 flist->malloced *= 2;
 275
 276         /*
 277          * In case count jumped or we are starting the list
 278          * with a known size just set it.
 279          */
 280         if (flist->malloced < flist->count)
 281                 flist->malloced = flist->count;
 282
 283         new_ptr = realloc_array(flist->files, struct file_struct *,
 284                                 flist->malloced);
 285
 286         if (verbose >= 2 && flist->malloced != FLIST_START) {
 287                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 288                     who_am_i(),
 289                     (double)sizeof flist->files[0] * flist->malloced,
 290                     (new_ptr == flist->files) ? " not" : "");
 291         }
 292
 293         flist->files = new_ptr;
 294
 295         if (!flist->files)
 296                 out_of_memory("flist_expand");
 297 }
 298
 299 static void send_file_entry(struct file_struct *file, int f)
 300 {
 301         unsigned short flags;
 302         static time_t modtime;
 303         static mode_t mode;
 304         static int64 dev;
 305         static dev_t rdev;
 306         static uint32 rdev_major;
 307         static uid_t uid;
 308         static gid_t gid;
 309         static char lastname[MAXPATHLEN];
 310         char fname[MAXPATHLEN];
 311         int l1, l2;
 312
 313         if (f < 0)
 314                 return;
 315
 316         if (!file) {
 317                 write_byte(f, 0);
 318                 modtime = 0, mode = 0;
 319                 dev = 0, rdev = makedev(0, 0);
 320                 rdev_major = 0;
 321                 uid = 0, gid = 0;
 322                 *lastname = '\0';
 323                 return;
 324         }
 325
 326         f_name(file, fname);
 327
 328         flags = file->flags & XMIT_TOP_DIR;
 329
 330         if (file->mode == mode)
 331                 flags |= XMIT_SAME_MODE;
 332         else
 333                 mode = file->mode;
 334         if ((preserve_devices && IS_DEVICE(mode))
 335          || (preserve_specials && IS_SPECIAL(mode))) {
 336                 if (protocol_version < 28) {
 337                         if (file->u.rdev == rdev)
 338                                 flags |= XMIT_SAME_RDEV_pre28;
 339                         else
 340                                 rdev = file->u.rdev;
 341                 } else {
 342                         rdev = file->u.rdev;
 343                         if ((uint32)major(rdev) == rdev_major)
 344                                 flags |= XMIT_SAME_RDEV_MAJOR;
 345                         else
 346                                 rdev_major = major(rdev);
 347                         if ((uint32)minor(rdev) <= 0xFFu)
 348                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 349                 }
 350         } else if (protocol_version < 28)
 351                 rdev = makedev(0, 0);
 352         if (file->uid == uid)
 353                 flags |= XMIT_SAME_UID;
 354         else
 355                 uid = file->uid;
 356         if (file->gid == gid)
 357                 flags |= XMIT_SAME_GID;
 358         else
 359                 gid = file->gid;
 360         if (file->modtime == modtime)
 361                 flags |= XMIT_SAME_TIME;
 362         else
 363                 modtime = file->modtime;
 364
 365 #ifdef SUPPORT_HARD_LINKS
 366         if (file->link_u.idev) {
 367                 if (file->F_DEV == dev) {
 368                         if (protocol_version >= 28)
 369                                 flags |= XMIT_SAME_DEV;
 370                 } else
 371                         dev = file->F_DEV;
 372                 flags |= XMIT_HAS_IDEV_DATA;
 373         }
 374 #endif
 375
 376         for (l1 = 0;
 377             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 378             l1++) {}
 379         l2 = strlen(fname+l1);
 380
 381         if (l1 > 0)
 382                 flags |= XMIT_SAME_NAME;
 383         if (l2 > 255)
 384                 flags |= XMIT_LONG_NAME;
 385
 386         /* We must make sure we don't send a zero flag byte or the
 387          * other end will terminate the flist transfer.  Note that
 388          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 389          * it's harmless way to add a bit to the first flag byte. */
 390         if (protocol_version >= 28) {
 391                 if (!flags && !S_ISDIR(mode))
 392                         flags |= XMIT_TOP_DIR;
 393                 if ((flags & 0xFF00) || !flags) {
 394                         flags |= XMIT_EXTENDED_FLAGS;
 395                         write_byte(f, flags);
 396                         write_byte(f, flags >> 8);
 397                 } else
 398                         write_byte(f, flags);
 399         } else {
 400                 if (!(flags & 0xFF))
 401                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 402                 write_byte(f, flags);
 403         }
 404         if (flags & XMIT_SAME_NAME)
 405                 write_byte(f, l1);
 406         if (flags & XMIT_LONG_NAME)
 407                 write_int(f, l2);
 408         else
 409                 write_byte(f, l2);
 410         write_buf(f, fname + l1, l2);
 411
 412         write_longint(f, file->length);
 413         if (!(flags & XMIT_SAME_TIME))
 414                 write_int(f, modtime);
 415         if (!(flags & XMIT_SAME_MODE))
 416                 write_int(f, to_wire_mode(mode));
 417         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 418                 if (!numeric_ids)
 419                         add_uid(uid);
 420                 write_int(f, uid);
 421         }
 422         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 423                 if (!numeric_ids)
 424                         add_gid(gid);
 425                 write_int(f, gid);
 426         }
 427         if ((preserve_devices && IS_DEVICE(mode))
 428          || (preserve_specials && IS_SPECIAL(mode))) {
 429                 if (protocol_version < 28) {
 430                         if (!(flags & XMIT_SAME_RDEV_pre28))
 431                                 write_int(f, (int)rdev);
 432                 } else {
 433                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 434                                 write_int(f, major(rdev));
 435                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 436                                 write_byte(f, minor(rdev));
 437                         else
 438                                 write_int(f, minor(rdev));
 439                 }
 440         }
 441
 442 #ifdef SUPPORT_LINKS
 443         if (preserve_links && S_ISLNK(mode)) {
 444                 int len = strlen(file->u.link);
 445                 write_int(f, len);
 446                 write_buf(f, file->u.link, len);
 447         }
 448 #endif
 449
 450 #ifdef SUPPORT_HARD_LINKS
 451         if (flags & XMIT_HAS_IDEV_DATA) {
 452                 if (protocol_version < 26) {
 453                         /* 32-bit dev_t and ino_t */
 454                         write_int(f, dev);
 455                         write_int(f, file->F_INODE);
 456                 } else {
 457                         /* 64-bit dev_t and ino_t */
 458                         if (!(flags & XMIT_SAME_DEV))
 459                                 write_longint(f, dev);
 460                         write_longint(f, file->F_INODE);
 461                 }
 462         }
 463 #endif
 464
 465         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 466                 char *sum;
 467                 if (S_ISREG(mode))
 468                         sum = file->u.sum;
 469                 else {
 470                         /* Prior to 28, we sent a useless set of nulls. */
 471                         sum = empty_sum;
 472                 }
 473                 write_buf(f, sum, checksum_len);
 474         }
 475
 476         strlcpy(lastname, fname, MAXPATHLEN);
 477 }
 478
 479 static struct file_struct *receive_file_entry(struct file_list *flist,
 480                                               unsigned short flags, int f)
 481 {
 482         static time_t modtime;
 483         static mode_t mode;
 484         static int64 dev;
 485         static dev_t rdev;
 486         static uint32 rdev_major;
 487         static uid_t uid;
 488         static gid_t gid;
 489         static char lastname[MAXPATHLEN], *lastdir;
 490         static int lastdir_depth, lastdir_len = -1;
 491         static unsigned int del_hier_name_len = 0;
 492         static int in_del_hier = 0;
 493         char thisname[MAXPATHLEN];
 494         unsigned int l1 = 0, l2 = 0;
 495         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 496         OFF_T file_length;
 497         char *basename, *dirname, *bp;
 498         struct file_struct *file;
 499
 500         if (!flist) {
 501                 modtime = 0, mode = 0;
 502                 dev = 0, rdev = makedev(0, 0);
 503                 rdev_major = 0;
 504                 uid = 0, gid = 0;
 505                 *lastname = '\0';
 506                 lastdir_len = -1;
 507                 in_del_hier = 0;
 508                 return NULL;
 509         }
 510
 511         if (flags & XMIT_SAME_NAME)
 512                 l1 = read_byte(f);
 513
 514         if (flags & XMIT_LONG_NAME)
 515                 l2 = read_int(f);
 516         else
 517                 l2 = read_byte(f);
 518
 519         if (l2 >= MAXPATHLEN - l1) {
 520                 rprintf(FERROR,
 521                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 522                         flags, l1, l2, lastname);
 523                 overflow_exit("receive_file_entry");
 524         }
 525
 526         strlcpy(thisname, lastname, l1 + 1);
 527         read_sbuf(f, &thisname[l1], l2);
 528         thisname[l1 + l2] = 0;
 529
 530         strlcpy(lastname, thisname, MAXPATHLEN);
 531
 532         clean_fname(thisname, 0);
 533
 534         if (sanitize_paths)
 535                 sanitize_path(thisname, thisname, "", 0);
 536
 537         if ((basename = strrchr(thisname, '/')) != NULL) {
 538                 dirname_len = ++basename - thisname; /* counts future '\0' */
 539                 if (lastdir_len == dirname_len - 1
 540                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 541                         dirname = lastdir;
 542                         dirname_len = 0; /* indicates no copy is needed */
 543                 } else
 544                         dirname = thisname;
 545         } else {
 546                 basename = thisname;
 547                 dirname = NULL;
 548                 dirname_len = 0;
 549         }
 550         basename_len = strlen(basename) + 1; /* count the '\0' */
 551
 552         file_length = read_longint(f);
 553         if (!(flags & XMIT_SAME_TIME))
 554                 modtime = (time_t)read_int(f);
 555         if (!(flags & XMIT_SAME_MODE))
 556                 mode = from_wire_mode(read_int(f));
 557
 558         if (chmod_modes && !S_ISLNK(mode))
 559                 mode = tweak_mode(mode, chmod_modes);
 560
 561         if (preserve_uid && !(flags & XMIT_SAME_UID))
 562                 uid = (uid_t)read_int(f);
 563         if (preserve_gid && !(flags & XMIT_SAME_GID))
 564                 gid = (gid_t)read_int(f);
 565
 566         if ((preserve_devices && IS_DEVICE(mode))
 567          || (preserve_specials && IS_SPECIAL(mode))) {
 568                 if (protocol_version < 28) {
 569                         if (!(flags & XMIT_SAME_RDEV_pre28))
 570                                 rdev = (dev_t)read_int(f);
 571                 } else {
 572                         uint32 rdev_minor;
 573                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 574                                 rdev_major = read_int(f);
 575                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 576                                 rdev_minor = read_byte(f);
 577                         else
 578                                 rdev_minor = read_int(f);
 579                         rdev = makedev(rdev_major, rdev_minor);
 580                 }
 581         } else if (protocol_version < 28)
 582                 rdev = makedev(0, 0);
 583
 584 #ifdef SUPPORT_LINKS
 585         if (preserve_links && S_ISLNK(mode)) {
 586                 linkname_len = read_int(f) + 1; /* count the '\0' */
 587                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 588                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 589                                 linkname_len - 1);
 590                         overflow_exit("receive_file_entry");
 591                 }
 592         }
 593         else
 594 #endif
 595                 linkname_len = 0;
 596
 597         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 598
 599         alloc_len = file_struct_len + dirname_len + basename_len
 600                   + linkname_len + sum_len;
 601         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 602
 603         file = (struct file_struct *)bp;
 604         memset(bp, 0, file_struct_len);
 605         bp += file_struct_len;
 606
 607         file->modtime = modtime;
 608         file->length = file_length;
 609         file->mode = mode;
 610         file->uid = uid;
 611         file->gid = gid;
 612
 613         if (dirname_len) {
 614                 file->dirname = lastdir = bp;
 615                 lastdir_len = dirname_len - 1;
 616                 memcpy(bp, dirname, dirname_len - 1);
 617                 bp += dirname_len;
 618                 bp[-1] = '\0';
 619                 lastdir_depth = count_dir_elements(lastdir);
 620                 file->dir.depth = lastdir_depth + 1;
 621         } else if (dirname) {
 622                 file->dirname = dirname; /* we're reusing lastname */
 623                 file->dir.depth = lastdir_depth + 1;
 624         } else
 625                 file->dir.depth = 1;
 626
 627         if (S_ISDIR(mode)) {
 628                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 629                         file->dir.depth--;
 630                 if (flags & XMIT_TOP_DIR) {
 631                         in_del_hier = recurse;
 632                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 633                         if (relative_paths && del_hier_name_len > 2
 634                             && lastname[del_hier_name_len-1] == '.'
 635                             && lastname[del_hier_name_len-2] == '/')
 636                                 del_hier_name_len -= 2;
 637                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 638                 } else if (in_del_hier) {
 639                         if (!relative_paths || !del_hier_name_len
 640                          || (l1 >= del_hier_name_len
 641                           && lastname[del_hier_name_len] == '/'))
 642                                 file->flags |= FLAG_DEL_HERE;
 643                         else
 644                                 in_del_hier = 0;
 645                 }
 646         }
 647
 648         file->basename = bp;
 649         memcpy(bp, basename, basename_len);
 650         bp += basename_len;
 651
 652         if ((preserve_devices && IS_DEVICE(mode))
 653          || (preserve_specials && IS_SPECIAL(mode)))
 654                 file->u.rdev = rdev;
 655
 656 #ifdef SUPPORT_LINKS
 657         if (linkname_len) {
 658                 file->u.link = bp;
 659                 read_sbuf(f, bp, linkname_len - 1);
 660                 bp += linkname_len;
 661         }
 662 #endif
 663
 664 #ifdef SUPPORT_HARD_LINKS
 665         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 666                 flags |= XMIT_HAS_IDEV_DATA;
 667         if (flags & XMIT_HAS_IDEV_DATA) {
 668                 int64 inode;
 669                 if (protocol_version < 26) {
 670                         dev = read_int(f);
 671                         inode = read_int(f);
 672                 } else {
 673                         if (!(flags & XMIT_SAME_DEV))
 674                                 dev = read_longint(f);
 675                         inode = read_longint(f);
 676                 }
 677                 if (flist->hlink_pool) {
 678                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 679                             struct idev, 1, "inode_table");
 680                         file->F_INODE = inode;
 681                         file->F_DEV = dev;
 682                 }
 683         }
 684 #endif
 685
 686         if (always_checksum && (sum_len || protocol_version < 28)) {
 687                 char *sum;
 688                 if (sum_len) {
 689                         file->u.sum = sum = bp;
 690                         /*bp += sum_len;*/
 691                 } else {
 692                         /* Prior to 28, we get a useless set of nulls. */
 693                         sum = empty_sum;
 694                 }
 695                 read_buf(f, sum, checksum_len);
 696         }
 697
 698         return file;
 699 }
 700
 701 /**
 702  * Create a file_struct for a named file by reading its stat()
 703  * information and performing extensive checks against global
 704  * options.
 705  *
 706  * @return the new file, or NULL if there was an error or this file
 707  * should be excluded.
 708  *
 709  * @todo There is a small optimization opportunity here to avoid
 710  * stat()ing the file in some circumstances, which has a certain cost.
 711  * We are called immediately after doing readdir(), and so we may
 712  * already know the d_type of the file.  We could for example avoid
 713  * statting directories if we're not recursing, but this is not a very
 714  * important case.  Some systems may not have d_type.
 715  **/
 716 struct file_struct *make_file(char *fname, struct file_list *flist,
 717                               STRUCT_STAT *stp, unsigned short flags,
 718                               int filter_level)
 719 {
 720         static char *lastdir;
 721         static int lastdir_len = -1;
 722         struct file_struct *file;
 723         STRUCT_STAT st;
 724         char sum[SUM_LENGTH];
 725         char thisname[MAXPATHLEN];
 726         char linkname[MAXPATHLEN];
 727         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 728         char *basename, *dirname, *bp;
 729
 730         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 731                 lastdir_len = -1;
 732
 733         if (strlcpy(thisname, fname, sizeof thisname)
 734             >= sizeof thisname - flist_dir_len) {
 735                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 736                 return NULL;
 737         }
 738         clean_fname(thisname, 0);
 739         if (sanitize_paths)
 740                 sanitize_path(thisname, thisname, "", 0);
 741
 742         memset(sum, 0, SUM_LENGTH);
 743
 744         if (stp && S_ISDIR(stp->st_mode))
 745                 st = *stp; /* Needed for "symlink/." with --relative. */
 746         else if (readlink_stat(thisname, &st, linkname) != 0) {
 747                 int save_errno = errno;
 748                 /* See if file is excluded before reporting an error. */
 749                 if (filter_level != NO_FILTERS
 750                     && is_excluded(thisname, 0, filter_level))
 751                         return NULL;
 752                 if (save_errno == ENOENT) {
 753 #ifdef SUPPORT_LINKS
 754                         /* Avoid "vanished" error if symlink points nowhere. */
 755                         if (copy_links && do_lstat(thisname, &st) == 0
 756                             && S_ISLNK(st.st_mode)) {
 757                                 io_error |= IOERR_GENERAL;
 758                                 rprintf(FERROR, "symlink has no referent: %s\n",
 759                                         full_fname(thisname));
 760                         } else
 761 #endif
 762                         {
 763                                 enum logcode c = am_daemon && protocol_version < 28
 764                                     ? FERROR : FINFO;
 765                                 io_error |= IOERR_VANISHED;
 766                                 rprintf(c, "file has vanished: %s\n",
 767                                         full_fname(thisname));
 768                         }
 769                 } else {
 770                         io_error |= IOERR_GENERAL;
 771                         rsyserr(FERROR, save_errno, "readlink %s failed",
 772                                 full_fname(thisname));
 773                 }
 774                 return NULL;
 775         }
 776
 777         /* backup.c calls us with filter_level set to NO_FILTERS. */
 778         if (filter_level == NO_FILTERS)
 779                 goto skip_filters;
 780
 781         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 782                 rprintf(FINFO, "skipping directory %s\n", thisname);
 783                 return NULL;
 784         }
 785
 786         /* We only care about directories because we need to avoid recursing
 787          * into a mount-point directory, not to avoid copying a symlinked
 788          * file if -L (or similar) was specified. */
 789         if (one_file_system && st.st_dev != filesystem_dev
 790          && S_ISDIR(st.st_mode)) {
 791                 if (one_file_system > 1) {
 792                         if (verbose > 2) {
 793                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 794                                         thisname);
 795                         }
 796                         return NULL;
 797                 }
 798                 flags |= FLAG_MOUNT_POINT;
 799         }
 800
 801         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 802                 return NULL;
 803
 804         if (lp_ignore_nonreadable(module_id)) {
 805 #ifdef SUPPORT_LINKS
 806                 if (!S_ISLNK(st.st_mode))
 807 #endif
 808                         if (access(thisname, R_OK) != 0)
 809                                 return NULL;
 810         }
 811
 812   skip_filters:
 813
 814         if (verbose > 2) {
 815                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 816                         who_am_i(), thisname, filter_level);
 817         }
 818
 819         if ((basename = strrchr(thisname, '/')) != NULL) {
 820                 dirname_len = ++basename - thisname; /* counts future '\0' */
 821                 if (lastdir_len == dirname_len - 1
 822                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 823                         dirname = lastdir;
 824                         dirname_len = 0; /* indicates no copy is needed */
 825                 } else
 826                         dirname = thisname;
 827         } else {
 828                 basename = thisname;
 829                 dirname = NULL;
 830                 dirname_len = 0;
 831         }
 832         basename_len = strlen(basename) + 1; /* count the '\0' */
 833
 834 #ifdef SUPPORT_LINKS
 835         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 836 #else
 837         linkname_len = 0;
 838 #endif
 839
 840         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 841                 ? MD4_SUM_LENGTH : 0;
 842
 843         alloc_len = file_struct_len + dirname_len + basename_len
 844                   + linkname_len + sum_len;
 845         if (flist)
 846                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 847         else {
 848                 if (!(bp = new_array(char, alloc_len)))
 849                         out_of_memory("make_file");
 850         }
 851
 852         file = (struct file_struct *)bp;
 853         memset(bp, 0, file_struct_len);
 854         bp += file_struct_len;
 855
 856         file->flags = flags;
 857         file->modtime = st.st_mtime;
 858         file->length = st.st_size;
 859         file->mode = st.st_mode;
 860         file->uid = st.st_uid;
 861         file->gid = st.st_gid;
 862
 863 #ifdef SUPPORT_HARD_LINKS
 864         if (flist && flist->hlink_pool) {
 865                 if (protocol_version < 28) {
 866                         if (S_ISREG(st.st_mode))
 867                                 file->link_u.idev = pool_talloc(
 868                                     flist->hlink_pool, struct idev, 1,
 869                                     "inode_table");
 870                 } else {
 871                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 872                                 file->link_u.idev = pool_talloc(
 873                                     flist->hlink_pool, struct idev, 1,
 874                                     "inode_table");
 875                 }
 876         }
 877         if (file->link_u.idev) {
 878                 file->F_DEV = st.st_dev;
 879                 file->F_INODE = st.st_ino;
 880         }
 881 #endif
 882
 883         if (dirname_len) {
 884                 file->dirname = lastdir = bp;
 885                 lastdir_len = dirname_len - 1;
 886                 memcpy(bp, dirname, dirname_len - 1);
 887                 bp += dirname_len;
 888                 bp[-1] = '\0';
 889         } else if (dirname)
 890                 file->dirname = dirname;
 891
 892         file->basename = bp;
 893         memcpy(bp, basename, basename_len);
 894         bp += basename_len;
 895
 896 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 897         if ((preserve_devices && IS_DEVICE(st.st_mode))
 898          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 899                 file->u.rdev = st.st_rdev;
 900 #endif
 901
 902 #ifdef SUPPORT_LINKS
 903         if (linkname_len) {
 904                 file->u.link = bp;
 905                 memcpy(bp, linkname, linkname_len);
 906                 bp += linkname_len;
 907         }
 908 #endif
 909
 910         if (sum_len) {
 911                 file->u.sum = bp;
 912                 file_checksum(thisname, bp, st.st_size);
 913                 /*bp += sum_len;*/
 914         }
 915
 916         file->dir.root = flist_dir;
 917
 918         /* This code is only used by the receiver when it is building
 919          * a list of files for a delete pass. */
 920         if (keep_dirlinks && linkname_len && flist) {
 921                 STRUCT_STAT st2;
 922                 int save_mode = file->mode;
 923                 file->mode = S_IFDIR; /* Find a directory with our name. */
 924                 if (flist_find(the_file_list, file) >= 0
 925                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 926                         file->modtime = st2.st_mtime;
 927                         file->length = st2.st_size;
 928                         file->mode = st2.st_mode;
 929                         file->uid = st2.st_uid;
 930                         file->gid = st2.st_gid;
 931                         file->u.link = NULL;
 932                 } else
 933                         file->mode = save_mode;
 934         }
 935
 936         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 937                 stats.total_size += st.st_size;
 938
 939         return file;
 940 }
 941
 942 static struct file_struct *send_file_name(int f, struct file_list *flist,
 943                                           char *fname, STRUCT_STAT *stp,
 944                                           unsigned short flags)
 945 {
 946         struct file_struct *file;
 947
 948         file = make_file(fname, flist, stp, flags,
 949                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 950         if (!file)
 951                 return NULL;
 952
 953         if (chmod_modes && !S_ISLNK(file->mode))
 954                 file->mode = tweak_mode(file->mode, chmod_modes);
 955
 956         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 957
 958         flist_expand(flist);
 959
 960         if (file->basename[0]) {
 961                 flist->files[flist->count++] = file;
 962                 send_file_entry(file, f);
 963         }
 964         return file;
 965 }
 966
 967 static void send_if_directory(int f, struct file_list *flist,
 968                               struct file_struct *file,
 969                               char *fbuf, unsigned int ol)
 970 {
 971         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 972
 973         if (S_ISDIR(file->mode)
 974             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 975                 void *save_filters;
 976                 unsigned int len = strlen(fbuf);
 977                 if (len > 1 && fbuf[len-1] == '/')
 978                         fbuf[--len] = '\0';
 979                 if (len >= MAXPATHLEN - 1) {
 980                         io_error |= IOERR_GENERAL;
 981                         rprintf(FERROR, "skipping long-named directory: %s\n",
 982                                 full_fname(fbuf));
 983                         return;
 984                 }
 985                 save_filters = push_local_filters(fbuf, len);
 986                 send_directory(f, flist, fbuf, len);
 987                 pop_local_filters(save_filters);
 988                 fbuf[ol] = '\0';
 989                 if (is_dot_dir)
 990                         fbuf[ol-1] = '.';
 991         }
 992 }
 993
 994 /* This function is normally called by the sender, but the receiving side also
 995  * calls it from get_dirlist() with f set to -1 so that we just construct the
 996  * file list in memory without sending it over the wire.  Also, get_dirlist()
 997  * might call this with f set to -2, which also indicates that local filter
 998  * rules should be ignored. */
 999 static void send_directory(int f, struct file_list *flist,
1000                            char *fbuf, int len)
1001 {
1002         struct dirent *di;
1003         unsigned remainder;
1004         char *p;
1005         DIR *d;
1006         int start = flist->count;
1007
1008         if (!(d = opendir(fbuf))) {
1009                 io_error |= IOERR_GENERAL;
1010                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1011                 return;
1012         }
1013
1014         p = fbuf + len;
1015         if (len != 1 || *fbuf != '/')
1016                 *p++ = '/';
1017         *p = '\0';
1018         remainder = MAXPATHLEN - (p - fbuf);
1019
1020         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1021                 char *dname = d_name(di);
1022                 if (dname[0] == '.' && (dname[1] == '\0'
1023                     || (dname[1] == '.' && dname[2] == '\0')))
1024                         continue;
1025                 if (strlcpy(p, dname, remainder) >= remainder) {
1026                         io_error |= IOERR_GENERAL;
1027                         rprintf(FINFO,
1028                                 "cannot send long-named file %s\n",
1029                                 full_fname(fbuf));
1030                         continue;
1031                 }
1032
1033                 send_file_name(f, flist, fbuf, NULL, 0);
1034         }
1035
1036         fbuf[len] = '\0';
1037
1038         if (errno) {
1039                 io_error |= IOERR_GENERAL;
1040                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1041         }
1042
1043         closedir(d);
1044
1045         if (recurse) {
1046                 int i, end = flist->count - 1;
1047                 for (i = start; i <= end; i++)
1048                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1049         }
1050 }
1051
1052 struct file_list *send_file_list(int f, int argc, char *argv[])
1053 {
1054         int len;
1055         STRUCT_STAT st;
1056         char *p, *dir, olddir[sizeof curr_dir];
1057         char lastpath[MAXPATHLEN] = "";
1058         struct file_list *flist;
1059         struct timeval start_tv, end_tv;
1060         int64 start_write;
1061         int use_ff_fd = 0;
1062
1063         if (show_filelist_p())
1064                 start_filelist_progress("building file list");
1065
1066         start_write = stats.total_written;
1067         gettimeofday(&start_tv, NULL);
1068
1069         flist = flist_new(WITH_HLINK, "send_file_list");
1070
1071         io_start_buffering_out();
1072         if (filesfrom_fd >= 0) {
1073                 if (argv[0] && !push_dir(argv[0])) {
1074                         rsyserr(FERROR, errno, "push_dir %s failed",
1075                                 full_fname(argv[0]));
1076                         exit_cleanup(RERR_FILESELECT);
1077                 }
1078                 use_ff_fd = 1;
1079         }
1080
1081         while (1) {
1082                 char fbuf[MAXPATHLEN];
1083                 char *fn;
1084                 int is_dot_dir;
1085
1086                 if (use_ff_fd) {
1087                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1088                                 break;
1089                         sanitize_path(fbuf, fbuf, "", 0);
1090                 } else {
1091                         if (argc-- == 0)
1092                                 break;
1093                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1094                         if (sanitize_paths)
1095                                 sanitize_path(fbuf, fbuf, "", 0);
1096                 }
1097
1098                 len = strlen(fbuf);
1099                 if (relative_paths) {
1100                         /* We clean up fbuf below. */
1101                         is_dot_dir = 0;
1102                 } else if (!len || fbuf[len - 1] == '/') {
1103                         if (len == 2 && fbuf[0] == '.') {
1104                                 /* Turn "./" into just "." rather than "./." */
1105                                 fbuf[1] = '\0';
1106                         } else {
1107                                 if (len + 1 >= MAXPATHLEN)
1108                                         overflow_exit("send_file_list");
1109                                 fbuf[len++] = '.';
1110                                 fbuf[len] = '\0';
1111                         }
1112                         is_dot_dir = 1;
1113                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1114                     && (len == 2 || fbuf[len-3] == '/')) {
1115                         if (len + 2 >= MAXPATHLEN)
1116                                 overflow_exit("send_file_list");
1117                         fbuf[len++] = '/';
1118                         fbuf[len++] = '.';
1119                         fbuf[len] = '\0';
1120                         is_dot_dir = 1;
1121                 } else {
1122                         is_dot_dir = fbuf[len-1] == '.'
1123                                    && (len == 1 || fbuf[len-2] == '/');
1124                 }
1125
1126                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1127                         io_error |= IOERR_GENERAL;
1128                         rsyserr(FERROR, errno, "link_stat %s failed",
1129                                 full_fname(fbuf));
1130                         continue;
1131                 }
1132
1133                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1134                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1135                         continue;
1136                 }
1137
1138                 dir = NULL;
1139                 olddir[0] = '\0';
1140
1141                 if (!relative_paths) {
1142                         p = strrchr(fbuf, '/');
1143                         if (p) {
1144                                 *p = '\0';
1145                                 if (p == fbuf)
1146                                         dir = "/";
1147                                 else
1148                                         dir = fbuf;
1149                                 len -= p - fbuf + 1;
1150                                 fn = p + 1;
1151                         } else
1152                                 fn = fbuf;
1153                 } else {
1154                         if ((p = strstr(fbuf, "/./")) != NULL) {
1155                                 *p = '\0';
1156                                 if (p == fbuf)
1157                                         dir = "/";
1158                                 else
1159                                         dir = fbuf;
1160                                 len -= p - fbuf + 3;
1161                                 fn = p + 3;
1162                         } else
1163                                 fn = fbuf;
1164                         /* Get rid of trailing "/" and "/.". */
1165                         while (len) {
1166                                 if (fn[len - 1] == '/') {
1167                                         is_dot_dir = 1;
1168                                         if (!--len && !dir) {
1169                                                 len++;
1170                                                 break;
1171                                         }
1172                                 }
1173                                 else if (len >= 2 && fn[len - 1] == '.'
1174                                                   && fn[len - 2] == '/') {
1175                                         is_dot_dir = 1;
1176                                         if (!(len -= 2) && !dir) {
1177                                                 len++;
1178                                                 break;
1179                                         }
1180                                 } else
1181                                         break;
1182                         }
1183                         fn[len] = '\0';
1184                         /* Reject a ".." dir in the active part of the path. */
1185                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1186                                 if ((p[2] == '/' || p[2] == '\0')
1187                                  && (p == fn || p[-1] == '/')) {
1188                                         rprintf(FERROR,
1189                                             "found \"..\" dir in relative path: %s\n",
1190                                             fbuf);
1191                                         exit_cleanup(RERR_SYNTAX);
1192                                 }
1193                         }
1194                 }
1195
1196                 if (!*fn) {
1197                         len = 1;
1198                         fn = ".";
1199                 }
1200
1201                 if (dir && *dir) {
1202                         static char *lastdir;
1203                         static int lastdir_len;
1204
1205                         strlcpy(olddir, curr_dir, sizeof olddir);
1206
1207                         if (!push_dir(dir)) {
1208                                 io_error |= IOERR_GENERAL;
1209                                 rsyserr(FERROR, errno, "push_dir %s failed",
1210                                         full_fname(dir));
1211                                 continue;
1212                         }
1213
1214                         if (lastdir && strcmp(lastdir, dir) == 0) {
1215                                 flist_dir = lastdir;
1216                                 flist_dir_len = lastdir_len;
1217                         } else {
1218                                 flist_dir = lastdir = strdup(dir);
1219                                 flist_dir_len = lastdir_len = strlen(dir);
1220                         }
1221                 }
1222
1223                 if (fn != fbuf)
1224                         memmove(fbuf, fn, len + 1);
1225
1226                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1227                         /* Send the implied directories at the start of the
1228                          * source spec, so we get their permissions right. */
1229                         char *lp = lastpath, *slash = fbuf;
1230                         *p = '\0';
1231                         /* Skip any initial directories in our path that we
1232                          * have in common with lastpath. */
1233                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1234                                 if (*fn == '/')
1235                                         slash = fn;
1236                         }
1237                         *p = '/';
1238                         if (fn != p || (*lp && *lp != '/')) {
1239                                 int save_copy_links = copy_links;
1240                                 int save_xfer_dirs = xfer_dirs;
1241                                 copy_links |= copy_unsafe_links;
1242                                 xfer_dirs = 1;
1243                                 while ((slash = strchr(slash+1, '/')) != 0) {
1244                                         *slash = '\0';
1245                                         send_file_name(f, flist, fbuf, NULL, 0);
1246                                         *slash = '/';
1247                                 }
1248                                 copy_links = save_copy_links;
1249                                 xfer_dirs = save_xfer_dirs;
1250                                 *p = '\0';
1251                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1252                                 *p = '/';
1253                         }
1254                 }
1255
1256                 if (one_file_system)
1257                         filesystem_dev = st.st_dev;
1258
1259                 if (recurse || (xfer_dirs && is_dot_dir)) {
1260                         struct file_struct *file;
1261                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1262                         if (file)
1263                                 send_if_directory(f, flist, file, fbuf, len);
1264                 } else
1265                         send_file_name(f, flist, fbuf, &st, 0);
1266
1267                 if (olddir[0]) {
1268                         flist_dir = NULL;
1269                         flist_dir_len = 0;
1270                         if (!pop_dir(olddir)) {
1271                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1272                                         full_fname(olddir));
1273                                 exit_cleanup(RERR_FILESELECT);
1274                         }
1275                 }
1276         }
1277
1278         gettimeofday(&end_tv, NULL);
1279         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1280                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1281         if (stats.flist_buildtime == 0)
1282                 stats.flist_buildtime = 1;
1283         start_tv = end_tv;
1284
1285         send_file_entry(NULL, f);
1286
1287         if (show_filelist_p())
1288                 finish_filelist_progress(flist);
1289
1290         gettimeofday(&end_tv, NULL);
1291         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1292                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1293
1294         if (flist->hlink_pool) {
1295                 pool_destroy(flist->hlink_pool);
1296                 flist->hlink_pool = NULL;
1297         }
1298
1299         /* Sort the list without removing any duplicates.  This allows the
1300          * receiving side to ask for any name they like, which gives us the
1301          * flexibility to change the way we unduplicate names in the future
1302          * without causing a compatibility problem with older versions. */
1303         clean_flist(flist, 0, 0);
1304
1305         send_uid_list(f);
1306
1307         /* send the io_error flag */
1308         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1309
1310         io_end_buffering();
1311         stats.flist_size = stats.total_written - start_write;
1312         stats.num_files = flist->count;
1313
1314         if (verbose > 3)
1315                 output_flist(flist);
1316
1317         if (verbose > 2)
1318                 rprintf(FINFO, "send_file_list done\n");
1319
1320         return flist;
1321 }
1322
1323 struct file_list *recv_file_list(int f)
1324 {
1325         struct file_list *flist;
1326         unsigned short flags;
1327         int64 start_read;
1328
1329         if (show_filelist_p())
1330                 start_filelist_progress("receiving file list");
1331
1332         start_read = stats.total_read;
1333
1334         flist = flist_new(WITH_HLINK, "recv_file_list");
1335
1336         flist->count = 0;
1337         flist->malloced = 1000;
1338         flist->files = new_array(struct file_struct *, flist->malloced);
1339         if (!flist->files)
1340                 goto oom;
1341
1342         while ((flags = read_byte(f)) != 0) {
1343                 struct file_struct *file;
1344
1345                 flist_expand(flist);
1346
1347                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1348                         flags |= read_byte(f) << 8;
1349                 file = receive_file_entry(flist, flags, f);
1350
1351                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1352                         stats.total_size += file->length;
1353
1354                 flist->files[flist->count++] = file;
1355
1356                 maybe_emit_filelist_progress(flist->count);
1357
1358                 if (verbose > 2) {
1359                         rprintf(FINFO, "recv_file_name(%s)\n",
1360                                 f_name(file, NULL));
1361                 }
1362         }
1363         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1364
1365         if (verbose > 2)
1366                 rprintf(FINFO, "received %d names\n", flist->count);
1367
1368         if (show_filelist_p())
1369                 finish_filelist_progress(flist);
1370
1371         clean_flist(flist, relative_paths, 1);
1372
1373         if (f >= 0) {
1374                 recv_uid_list(f, flist);
1375
1376                 /* Recv the io_error flag */
1377                 if (lp_ignore_errors(module_id) || ignore_errors)
1378                         read_int(f);
1379                 else
1380                         io_error |= read_int(f);
1381         }
1382
1383         if (verbose > 3)
1384                 output_flist(flist);
1385
1386         if (list_only) {
1387                 int i;
1388                 for (i = 0; i < flist->count; i++)
1389                         list_file_entry(flist->files[i]);
1390         }
1391
1392         if (verbose > 2)
1393                 rprintf(FINFO, "recv_file_list done\n");
1394
1395         stats.flist_size = stats.total_read - start_read;
1396         stats.num_files = flist->count;
1397
1398         return flist;
1399
1400   oom:
1401         out_of_memory("recv_file_list");
1402         return NULL;            /* not reached */
1403 }
1404
1405 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1406 {
1407         return f_name_cmp(*file1, *file2);
1408 }
1409
1410 /* Search for an identically-named item in the file list.  Note that the
1411  * items must agree in their directory-ness, or no match is returned. */
1412 int flist_find(struct file_list *flist, struct file_struct *f)
1413 {
1414         int low = flist->low, high = flist->high;
1415         int diff, mid, mid_up;
1416
1417         while (low <= high) {
1418                 mid = (low + high) / 2;
1419                 if (flist->files[mid]->basename)
1420                         mid_up = mid;
1421                 else {
1422                         /* Scan for the next non-empty entry using the cached
1423                          * distance values.  If the value isn't fully up-to-
1424                          * date, update it. */
1425                         mid_up = mid + flist->files[mid]->dir.depth;
1426                         if (!flist->files[mid_up]->basename) {
1427                                 do {
1428                                     mid_up += flist->files[mid_up]->dir.depth;
1429                                 } while (!flist->files[mid_up]->basename);
1430                                 flist->files[mid]->dir.depth = mid_up - mid;
1431                         }
1432                         if (mid_up > high) {
1433                                 /* If there's nothing left above us, set high to
1434                                  * a non-empty entry below us and continue. */
1435                                 high = mid - flist->files[mid]->length;
1436                                 if (!flist->files[high]->basename) {
1437                                         do {
1438                                             high -= flist->files[high]->length;
1439                                         } while (!flist->files[high]->basename);
1440                                         flist->files[mid]->length = mid - high;
1441                                 }
1442                                 continue;
1443                         }
1444                 }
1445                 diff = f_name_cmp(flist->files[mid_up], f);
1446                 if (diff == 0) {
1447                         if (protocol_version < 29
1448                             && S_ISDIR(flist->files[mid_up]->mode)
1449                             != S_ISDIR(f->mode))
1450                                 return -1;
1451                         return mid_up;
1452                 }
1453                 if (diff < 0)
1454                         low = mid_up + 1;
1455                 else
1456                         high = mid - 1;
1457         }
1458         return -1;
1459 }
1460
1461 /*
1462  * Free up any resources a file_struct has allocated
1463  * and clear the file.
1464  */
1465 void clear_file(struct file_struct *file, struct file_list *flist)
1466 {
1467         if (flist->hlink_pool && file->link_u.idev)
1468                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1469         memset(file, 0, file_struct_len);
1470         /* In an empty entry, dir.depth is an offset to the next non-empty
1471          * entry.  Likewise for length in the opposite direction.  We assume
1472          * that we're alone for now since flist_find() will adjust the counts
1473          * it runs into that aren't up-to-date. */
1474         file->length = file->dir.depth = 1;
1475 }
1476
1477 /*
1478  * allocate a new file list
1479  */
1480 struct file_list *flist_new(int with_hlink, char *msg)
1481 {
1482         struct file_list *flist;
1483
1484         flist = new(struct file_list);
1485         if (!flist)
1486                 out_of_memory(msg);
1487
1488         memset(flist, 0, sizeof (struct file_list));
1489
1490         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1491             out_of_memory, POOL_INTERN)))
1492                 out_of_memory(msg);
1493
1494 #ifdef SUPPORT_HARD_LINKS
1495         if (with_hlink && preserve_hard_links) {
1496                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1497                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1498                         out_of_memory(msg);
1499         }
1500 #endif
1501
1502         return flist;
1503 }
1504
1505 /*
1506  * free up all elements in a flist
1507  */
1508 void flist_free(struct file_list *flist)
1509 {
1510         pool_destroy(flist->file_pool);
1511         pool_destroy(flist->hlink_pool);
1512         free(flist->files);
1513         free(flist);
1514 }
1515
1516 /*
1517  * This routine ensures we don't have any duplicate names in our file list.
1518  * duplicate names can cause corruption because of the pipelining
1519  */
1520 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1521 {
1522         char fbuf[MAXPATHLEN];
1523         int i, prev_i = 0;
1524
1525         if (!flist)
1526                 return;
1527         if (flist->count == 0) {
1528                 flist->high = -1;
1529                 return;
1530         }
1531
1532         qsort(flist->files, flist->count,
1533             sizeof flist->files[0], (int (*)())file_compare);
1534
1535         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1536                 if (flist->files[i]->basename) {
1537                         prev_i = i;
1538                         break;
1539                 }
1540         }
1541         flist->low = prev_i;
1542         while (++i < flist->count) {
1543                 int j;
1544                 struct file_struct *file = flist->files[i];
1545
1546                 if (!file->basename)
1547                         continue;
1548                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1549                         j = prev_i;
1550                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1551                         int save_mode = file->mode;
1552                         /* Make sure that this directory doesn't duplicate a
1553                          * non-directory earlier in the list. */
1554                         flist->high = prev_i;
1555                         file->mode = S_IFREG;
1556                         j = flist_find(flist, file);
1557                         file->mode = save_mode;
1558                 } else
1559                         j = -1;
1560                 if (j >= 0) {
1561                         struct file_struct *fp = flist->files[j];
1562                         int keep, drop;
1563                         /* If one is a dir and the other is not, we want to
1564                          * keep the dir because it might have contents in the
1565                          * list. */
1566                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1567                                 if (S_ISDIR(file->mode))
1568                                         keep = i, drop = j;
1569                                 else
1570                                         keep = j, drop = i;
1571                         } else
1572                                 keep = j, drop = i;
1573                         if (verbose > 1 && !am_server) {
1574                                 rprintf(FINFO,
1575                                         "removing duplicate name %s from file list (%d)\n",
1576                                         f_name(file, fbuf), drop);
1577                         }
1578                         /* Make sure we don't lose track of a user-specified
1579                          * top directory. */
1580                         flist->files[keep]->flags |= flist->files[drop]->flags
1581                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1582
1583                         clear_file(flist->files[drop], flist);
1584
1585                         if (keep == i) {
1586                                 if (flist->low == drop) {
1587                                         for (j = drop + 1;
1588                                              j < i && !flist->files[j]->basename;
1589                                              j++) {}
1590                                         flist->low = j;
1591                                 }
1592                                 prev_i = i;
1593                         }
1594                 } else
1595                         prev_i = i;
1596         }
1597         flist->high = no_dups ? prev_i : flist->count - 1;
1598
1599         if (strip_root) {
1600                 /* We need to strip off the leading slashes for relative
1601                  * paths, but this must be done _after_ the sorting phase. */
1602                 for (i = flist->low; i <= flist->high; i++) {
1603                         struct file_struct *file = flist->files[i];
1604
1605                         if (!file->dirname)
1606                                 continue;
1607                         while (*file->dirname == '/')
1608                                 file->dirname++;
1609                         if (!*file->dirname)
1610                                 file->dirname = NULL;
1611                 }
1612         }
1613
1614         if (prune_empty_dirs && no_dups) {
1615                 int j, prev_depth = 0;
1616
1617                 prev_i = 0; /* It's OK that this isn't really true. */
1618
1619                 for (i = flist->low; i <= flist->high; i++) {
1620                         struct file_struct *fp, *file = flist->files[i];
1621
1622                         /* This temporarily abuses the dir.depth value for a
1623                          * directory that is in a chain that might get pruned.
1624                          * We restore the old value if it gets a reprieve. */
1625                         if (S_ISDIR(file->mode) && file->dir.depth) {
1626                                 /* Dump empty dirs when coming back down. */
1627                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1628                                         fp = flist->files[prev_i];
1629                                         if (fp->dir.depth >= 0)
1630                                                 break;
1631                                         prev_i = -fp->dir.depth-1;
1632                                         clear_file(fp, flist);
1633                                 }
1634                                 prev_depth = file->dir.depth;
1635                                 if (is_excluded(f_name(file, fbuf), 1,
1636                                                        ALL_FILTERS)) {
1637                                         /* Keep dirs through this dir. */
1638                                         for (j = prev_depth-1; ; j--) {
1639                                                 fp = flist->files[prev_i];
1640                                                 if (fp->dir.depth >= 0)
1641                                                         break;
1642                                                 prev_i = -fp->dir.depth-1;
1643                                                 fp->dir.depth = j;
1644                                         }
1645                                 } else
1646                                         file->dir.depth = -prev_i-1;
1647                                 prev_i = i;
1648                         } else {
1649                                 /* Keep dirs through this non-dir. */
1650                                 for (j = prev_depth; ; j--) {
1651                                         fp = flist->files[prev_i];
1652                                         if (fp->dir.depth >= 0)
1653                                                 break;
1654                                         prev_i = -fp->dir.depth-1;
1655                                         fp->dir.depth = j;
1656                                 }
1657                         }
1658                 }
1659                 /* Dump empty all remaining empty dirs. */
1660                 while (1) {
1661                         struct file_struct *fp = flist->files[prev_i];
1662                         if (fp->dir.depth >= 0)
1663                                 break;
1664                         prev_i = -fp->dir.depth-1;
1665                         clear_file(fp, flist);
1666                 }
1667
1668                 for (i = flist->low; i <= flist->high; i++) {
1669                         if (flist->files[i]->basename)
1670                                 break;
1671                 }
1672                 flist->low = i;
1673                 for (i = flist->high; i >= flist->low; i--) {
1674                         if (flist->files[i]->basename)
1675                                 break;
1676                 }
1677                 flist->high = i;
1678         }
1679 }
1680
1681 static void output_flist(struct file_list *flist)
1682 {
1683         char uidbuf[16], gidbuf[16], depthbuf[16];
1684         struct file_struct *file;
1685         const char *who = who_am_i();
1686         int i;
1687
1688         for (i = 0; i < flist->count; i++) {
1689                 file = flist->files[i];
1690                 if ((am_root || am_sender) && preserve_uid)
1691                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1692                 else
1693                         *uidbuf = '\0';
1694                 if (preserve_gid && file->gid != GID_NONE)
1695                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1696                 else
1697                         *gidbuf = '\0';
1698                 if (!am_sender)
1699                         sprintf(depthbuf, "%d", file->dir.depth);
1700                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1701                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1702                         file->dirname ? file->dirname : "",
1703                         file->dirname ? "/" : "", NS(file->basename),
1704                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1705                         (double)file->length, uidbuf, gidbuf, file->flags);
1706         }
1707 }
1708
1709 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1710 enum fnc_type { t_PATH, t_ITEM };
1711
1712 /* Compare the names of two file_struct entities, similar to how strcmp()
1713  * would do if it were operating on the joined strings.
1714  *
1715  * Some differences beginning with protocol_version 29: (1) directory names
1716  * are compared with an assumed trailing slash so that they compare in a
1717  * way that would cause them to sort immediately prior to any content they
1718  * may have; (2) a directory of any name compares after a non-directory of
1719  * any name at the same depth; (3) a directory with name "." compares prior
1720  * to anything else.  These changes mean that a directory and a non-dir
1721  * with the same name will not compare as equal (protocol_version >= 29).
1722  *
1723  * The dirname component can be an empty string, but the basename component
1724  * cannot (and never is in the current codebase).  The basename component
1725  * may be NULL (for a removed item), in which case it is considered to be
1726  * after any existing item. */
1727 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1728 {
1729         int dif;
1730         const uchar *c1, *c2;
1731         enum fnc_state state1, state2;
1732         enum fnc_type type1, type2;
1733         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1734
1735         if (!f1 || !f1->basename) {
1736                 if (!f2 || !f2->basename)
1737                         return 0;
1738                 return -1;
1739         }
1740         if (!f2 || !f2->basename)
1741                 return 1;
1742
1743         c1 = (uchar*)f1->dirname;
1744         c2 = (uchar*)f2->dirname;
1745         if (c1 == c2)
1746                 c1 = c2 = NULL;
1747         if (!c1) {
1748                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1749                 c1 = (uchar*)f1->basename;
1750                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1751                         type1 = t_ITEM;
1752                         state1 = s_TRAILING;
1753                         c1 = (uchar*)"";
1754                 } else
1755                         state1 = s_BASE;
1756         } else if (!*c1) {
1757                 type1 = t_path;
1758                 state1 = s_SLASH;
1759                 c1 = (uchar*)"/";
1760         } else {
1761                 type1 = t_path;
1762                 state1 = s_DIR;
1763         }
1764         if (!c2) {
1765                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1766                 c2 = (uchar*)f2->basename;
1767                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1768                         type2 = t_ITEM;
1769                         state2 = s_TRAILING;
1770                         c2 = (uchar*)"";
1771                 } else
1772                         state2 = s_BASE;
1773         } else if (!*c2) {
1774                 type2 = t_path;
1775                 state2 = s_SLASH;
1776                 c2 = (uchar*)"/";
1777         } else {
1778                 type2 = t_path;
1779                 state2 = s_DIR;
1780         }
1781
1782         if (type1 != type2)
1783                 return type1 == t_PATH ? 1 : -1;
1784
1785         while (1) {
1786                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1787                         break;
1788                 if (!*c1) {
1789                         switch (state1) {
1790                         case s_DIR:
1791                                 state1 = s_SLASH;
1792                                 c1 = (uchar*)"/";
1793                                 break;
1794                         case s_SLASH:
1795                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1796                                 c1 = (uchar*)f1->basename;
1797                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1798                                         type1 = t_ITEM;
1799                                         state1 = s_TRAILING;
1800                                         c1 = (uchar*)"";
1801                                 } else
1802                                         state1 = s_BASE;
1803                                 break;
1804                         case s_BASE:
1805                                 state1 = s_TRAILING;
1806                                 if (type1 == t_PATH) {
1807                                         c1 = (uchar*)"/";
1808                                         break;
1809                                 }
1810                                 /* FALL THROUGH */
1811                         case s_TRAILING:
1812                                 type1 = t_ITEM;
1813                                 break;
1814                         }
1815                         if (*c2 && type1 != type2)
1816                                 return type1 == t_PATH ? 1 : -1;
1817                 }
1818                 if (!*c2) {
1819                         switch (state2) {
1820                         case s_DIR:
1821                                 state2 = s_SLASH;
1822                                 c2 = (uchar*)"/";
1823                                 break;
1824                         case s_SLASH:
1825                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1826                                 c2 = (uchar*)f2->basename;
1827                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1828                                         type2 = t_ITEM;
1829                                         state2 = s_TRAILING;
1830                                         c2 = (uchar*)"";
1831                                 } else
1832                                         state2 = s_BASE;
1833                                 break;
1834                         case s_BASE:
1835                                 state2 = s_TRAILING;
1836                                 if (type2 == t_PATH) {
1837                                         c2 = (uchar*)"/";
1838                                         break;
1839                                 }
1840                                 /* FALL THROUGH */
1841                         case s_TRAILING:
1842                                 if (!*c1)
1843                                         return 0;
1844                                 type2 = t_ITEM;
1845                                 break;
1846                         }
1847                         if (type1 != type2)
1848                                 return type1 == t_PATH ? 1 : -1;
1849                 }
1850         }
1851
1852         return dif;
1853 }
1854
1855 /* Return a copy of the full filename of a flist entry, using the indicated
1856  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1857  * done because we checked the size when creating the file_struct entry.
1858  */
1859 char *f_name(struct file_struct *f, char *fbuf)
1860 {
1861         if (!f || !f->basename)
1862                 return NULL;
1863
1864         if (!fbuf) {
1865                 static char names[5][MAXPATHLEN];
1866                 static unsigned int n;
1867
1868                 n = (n + 1) % (sizeof names / sizeof names[0]);
1869
1870                 fbuf = names[n];
1871         }
1872
1873         if (f->dirname) {
1874                 int len = strlen(f->dirname);
1875                 memcpy(fbuf, f->dirname, len);
1876                 fbuf[len] = '/';
1877                 strcpy(fbuf + len + 1, f->basename);
1878         } else
1879                 strcpy(fbuf, f->basename);
1880
1881         return fbuf;
1882 }
1883
1884 /* Do a non-recursive scan of the named directory, possibly ignoring all
1885  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1886  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1887  * buffer (the functions we call will append names onto the end, but the old
1888  * dir value will be restored on exit). */
1889 struct file_list *get_dirlist(char *dirname, int dlen,
1890                               int ignore_filter_rules)
1891 {
1892         struct file_list *dirlist;
1893         char dirbuf[MAXPATHLEN];
1894         int save_recurse = recurse;
1895         int save_xfer_dirs = xfer_dirs;
1896
1897         if (dlen < 0) {
1898                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1899                 if (dlen >= MAXPATHLEN)
1900                         return NULL;
1901                 dirname = dirbuf;
1902         }
1903
1904         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1905
1906         recurse = 0;
1907         xfer_dirs = 1;
1908         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1909         xfer_dirs = save_xfer_dirs;
1910         recurse = save_recurse;
1911         if (do_progress)
1912                 flist_count_offset += dirlist->count;
1913
1914         clean_flist(dirlist, 0, 0);
1915
1916         if (verbose > 3)
1917                 output_flist(dirlist);
1918
1919         return dirlist;
1920 }