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 /**
 153  * Stat either a symlink or its referent, depending on the settings of
 154  * copy_links, copy_unsafe_links, etc.
 155  *
 156  * @retval -1 on error
 157  *
 158  * @retval 0 for success
 159  *
 160  * @post If @p path is a symlink, then @p linkbuf (of size @c
 161  * MAXPATHLEN) contains the symlink target.
 162  *
 163  * @post @p buffer contains information about the link or the
 164  * referrent as appropriate, if they exist.
 165  **/
 166 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 167 {
 168 #ifdef SUPPORT_LINKS
 169         if (copy_links)
 170                 return do_stat(path, buffer);
 171         if (link_stat(path, buffer, copy_dirlinks) < 0)
 172                 return -1;
 173         if (S_ISLNK(buffer->st_mode)) {
 174                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 175                 if (l == -1)
 176                         return -1;
 177                 linkbuf[l] = 0;
 178                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 179                         if (verbose > 1) {
 180                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 181                                         path, linkbuf);
 182                         }
 183                         return do_stat(path, buffer);
 184                 }
 185         }
 186         return 0;
 187 #else
 188         return do_stat(path, buffer);
 189 #endif
 190 }
 191
 192 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 193 {
 194 #ifdef SUPPORT_LINKS
 195         if (copy_links)
 196                 return do_stat(path, buffer);
 197         if (do_lstat(path, buffer) < 0)
 198                 return -1;
 199         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 200                 STRUCT_STAT st;
 201                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 202                         *buffer = st;
 203         }
 204         return 0;
 205 #else
 206         return do_stat(path, buffer);
 207 #endif
 208 }
 209
 210 /* This function is used to check if a file should be included/excluded
 211  * from the list of files based on its name and type etc.  The value of
 212  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 213 static int is_excluded(char *fname, int is_dir, int filter_level)
 214 {
 215 #if 0 /* This currently never happens, so avoid a useless compare. */
 216         if (filter_level == NO_FILTERS)
 217                 return 0;
 218 #endif
 219         if (fname) {
 220                 /* never exclude '.', even if somebody does --exclude '*' */
 221                 if (fname[0] == '.' && !fname[1])
 222                         return 0;
 223                 /* Handle the -R version of the '.' dir. */
 224                 if (fname[0] == '/') {
 225                         int len = strlen(fname);
 226                         if (fname[len-1] == '.' && fname[len-2] == '/')
 227                                 return 0;
 228                 }
 229         }
 230         if (server_filter_list.head
 231             && check_filter(&server_filter_list, fname, is_dir) < 0)
 232                 return 1;
 233         if (filter_level != ALL_FILTERS)
 234                 return 0;
 235         if (filter_list.head
 236             && check_filter(&filter_list, fname, is_dir) < 0)
 237                 return 1;
 238         return 0;
 239 }
 240
 241 static int to_wire_mode(mode_t mode)
 242 {
 243 #ifdef SUPPORT_LINKS
 244         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 245                 return (mode & ~(_S_IFMT)) | 0120000;
 246 #endif
 247         return (int)mode;
 248 }
 249
 250 static mode_t from_wire_mode(int mode)
 251 {
 252         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 253                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 254         return (mode_t)mode;
 255 }
 256
 257 static void send_directory(int f, struct file_list *flist,
 258                            char *fbuf, int len);
 259
 260 static char *flist_dir;
 261 static int flist_dir_len;
 262
 263
 264 /**
 265  * Make sure @p flist is big enough to hold at least @p flist->count
 266  * entries.
 267  **/
 268 void flist_expand(struct file_list *flist)
 269 {
 270         struct file_struct **new_ptr;
 271
 272         if (flist->count < flist->malloced)
 273                 return;
 274
 275         if (flist->malloced < FLIST_START)
 276                 flist->malloced = FLIST_START;
 277         else if (flist->malloced >= FLIST_LINEAR)
 278                 flist->malloced += FLIST_LINEAR;
 279         else
 280                 flist->malloced *= 2;
 281
 282         /*
 283          * In case count jumped or we are starting the list
 284          * with a known size just set it.
 285          */
 286         if (flist->malloced < flist->count)
 287                 flist->malloced = flist->count;
 288
 289         new_ptr = realloc_array(flist->files, struct file_struct *,
 290                                 flist->malloced);
 291
 292         if (verbose >= 2 && flist->malloced != FLIST_START) {
 293                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 294                     who_am_i(),
 295                     (double)sizeof flist->files[0] * flist->malloced,
 296                     (new_ptr == flist->files) ? " not" : "");
 297         }
 298
 299         flist->files = new_ptr;
 300
 301         if (!flist->files)
 302                 out_of_memory("flist_expand");
 303 }
 304
 305 static void send_file_entry(struct file_struct *file, int f)
 306 {
 307         unsigned short flags;
 308         static time_t modtime;
 309         static mode_t mode;
 310         static int64 dev;
 311         static dev_t rdev;
 312         static uint32 rdev_major;
 313         static uid_t uid;
 314         static gid_t gid;
 315         static char lastname[MAXPATHLEN];
 316         char fname[MAXPATHLEN];
 317         int l1, l2;
 318
 319         if (f < 0)
 320                 return;
 321
 322         if (!file) {
 323                 write_byte(f, 0);
 324                 modtime = 0, mode = 0;
 325                 dev = 0, rdev = makedev(0, 0);
 326                 rdev_major = 0;
 327                 uid = 0, gid = 0;
 328                 *lastname = '\0';
 329                 return;
 330         }
 331
 332         f_name(file, fname);
 333
 334         flags = file->flags & XMIT_TOP_DIR;
 335
 336         if (file->mode == mode)
 337                 flags |= XMIT_SAME_MODE;
 338         else
 339                 mode = file->mode;
 340         if ((preserve_devices && IS_DEVICE(mode))
 341          || (preserve_specials && IS_SPECIAL(mode))) {
 342                 if (protocol_version < 28) {
 343                         if (file->u.rdev == rdev)
 344                                 flags |= XMIT_SAME_RDEV_pre28;
 345                         else
 346                                 rdev = file->u.rdev;
 347                 } else {
 348                         rdev = file->u.rdev;
 349                         if ((uint32)major(rdev) == rdev_major)
 350                                 flags |= XMIT_SAME_RDEV_MAJOR;
 351                         else
 352                                 rdev_major = major(rdev);
 353                         if ((uint32)minor(rdev) <= 0xFFu)
 354                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 355                 }
 356         } else if (protocol_version < 28)
 357                 rdev = makedev(0, 0);
 358         if (file->uid == uid)
 359                 flags |= XMIT_SAME_UID;
 360         else
 361                 uid = file->uid;
 362         if (file->gid == gid)
 363                 flags |= XMIT_SAME_GID;
 364         else
 365                 gid = file->gid;
 366         if (file->modtime == modtime)
 367                 flags |= XMIT_SAME_TIME;
 368         else
 369                 modtime = file->modtime;
 370
 371 #ifdef SUPPORT_HARD_LINKS
 372         if (file->link_u.idev) {
 373                 if (file->F_DEV == dev) {
 374                         if (protocol_version >= 28)
 375                                 flags |= XMIT_SAME_DEV;
 376                 } else
 377                         dev = file->F_DEV;
 378                 flags |= XMIT_HAS_IDEV_DATA;
 379         }
 380 #endif
 381
 382         for (l1 = 0;
 383             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 384             l1++) {}
 385         l2 = strlen(fname+l1);
 386
 387         if (l1 > 0)
 388                 flags |= XMIT_SAME_NAME;
 389         if (l2 > 255)
 390                 flags |= XMIT_LONG_NAME;
 391
 392         /* We must make sure we don't send a zero flag byte or the
 393          * other end will terminate the flist transfer.  Note that
 394          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 395          * it's harmless way to add a bit to the first flag byte. */
 396         if (protocol_version >= 28) {
 397                 if (!flags && !S_ISDIR(mode))
 398                         flags |= XMIT_TOP_DIR;
 399                 if ((flags & 0xFF00) || !flags) {
 400                         flags |= XMIT_EXTENDED_FLAGS;
 401                         write_byte(f, flags);
 402                         write_byte(f, flags >> 8);
 403                 } else
 404                         write_byte(f, flags);
 405         } else {
 406                 if (!(flags & 0xFF))
 407                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 408                 write_byte(f, flags);
 409         }
 410         if (flags & XMIT_SAME_NAME)
 411                 write_byte(f, l1);
 412         if (flags & XMIT_LONG_NAME)
 413                 write_int(f, l2);
 414         else
 415                 write_byte(f, l2);
 416         write_buf(f, fname + l1, l2);
 417
 418         write_longint(f, file->length);
 419         if (!(flags & XMIT_SAME_TIME))
 420                 write_int(f, modtime);
 421         if (!(flags & XMIT_SAME_MODE))
 422                 write_int(f, to_wire_mode(mode));
 423         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 424                 if (!numeric_ids)
 425                         add_uid(uid);
 426                 write_int(f, uid);
 427         }
 428         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 429                 if (!numeric_ids)
 430                         add_gid(gid);
 431                 write_int(f, gid);
 432         }
 433         if ((preserve_devices && IS_DEVICE(mode))
 434          || (preserve_specials && IS_SPECIAL(mode))) {
 435                 if (protocol_version < 28) {
 436                         if (!(flags & XMIT_SAME_RDEV_pre28))
 437                                 write_int(f, (int)rdev);
 438                 } else {
 439                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 440                                 write_int(f, major(rdev));
 441                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 442                                 write_byte(f, minor(rdev));
 443                         else
 444                                 write_int(f, minor(rdev));
 445                 }
 446         }
 447
 448 #ifdef SUPPORT_LINKS
 449         if (preserve_links && S_ISLNK(mode)) {
 450                 int len = strlen(file->u.link);
 451                 write_int(f, len);
 452                 write_buf(f, file->u.link, len);
 453         }
 454 #endif
 455
 456 #ifdef SUPPORT_HARD_LINKS
 457         if (flags & XMIT_HAS_IDEV_DATA) {
 458                 if (protocol_version < 26) {
 459                         /* 32-bit dev_t and ino_t */
 460                         write_int(f, dev);
 461                         write_int(f, file->F_INODE);
 462                 } else {
 463                         /* 64-bit dev_t and ino_t */
 464                         if (!(flags & XMIT_SAME_DEV))
 465                                 write_longint(f, dev);
 466                         write_longint(f, file->F_INODE);
 467                 }
 468         }
 469 #endif
 470
 471         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 472                 char *sum;
 473                 if (S_ISREG(mode))
 474                         sum = file->u.sum;
 475                 else {
 476                         /* Prior to 28, we sent a useless set of nulls. */
 477                         sum = empty_sum;
 478                 }
 479                 write_buf(f, sum, checksum_len);
 480         }
 481
 482         strlcpy(lastname, fname, MAXPATHLEN);
 483 }
 484
 485 static struct file_struct *receive_file_entry(struct file_list *flist,
 486                                               unsigned short flags, int f)
 487 {
 488         static time_t modtime;
 489         static mode_t mode;
 490         static int64 dev;
 491         static dev_t rdev;
 492         static uint32 rdev_major;
 493         static uid_t uid;
 494         static gid_t gid;
 495         static char lastname[MAXPATHLEN], *lastdir;
 496         static int lastdir_depth, lastdir_len = -1;
 497         static unsigned int del_hier_name_len = 0;
 498         static int in_del_hier = 0;
 499         char thisname[MAXPATHLEN];
 500         unsigned int l1 = 0, l2 = 0;
 501         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 502         OFF_T file_length;
 503         char *basename, *dirname, *bp;
 504         struct file_struct *file;
 505
 506         if (!flist) {
 507                 modtime = 0, mode = 0;
 508                 dev = 0, rdev = makedev(0, 0);
 509                 rdev_major = 0;
 510                 uid = 0, gid = 0;
 511                 *lastname = '\0';
 512                 lastdir_len = -1;
 513                 in_del_hier = 0;
 514                 return NULL;
 515         }
 516
 517         if (flags & XMIT_SAME_NAME)
 518                 l1 = read_byte(f);
 519
 520         if (flags & XMIT_LONG_NAME)
 521                 l2 = read_int(f);
 522         else
 523                 l2 = read_byte(f);
 524
 525         if (l2 >= MAXPATHLEN - l1) {
 526                 rprintf(FERROR,
 527                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 528                         flags, l1, l2, lastname);
 529                 overflow_exit("receive_file_entry");
 530         }
 531
 532         strlcpy(thisname, lastname, l1 + 1);
 533         read_sbuf(f, &thisname[l1], l2);
 534         thisname[l1 + l2] = 0;
 535
 536         strlcpy(lastname, thisname, MAXPATHLEN);
 537
 538         clean_fname(thisname, 0);
 539
 540         if (sanitize_paths)
 541                 sanitize_path(thisname, thisname, "", 0);
 542
 543         if ((basename = strrchr(thisname, '/')) != NULL) {
 544                 dirname_len = ++basename - thisname; /* counts future '\0' */
 545                 if (lastdir_len == dirname_len - 1
 546                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 547                         dirname = lastdir;
 548                         dirname_len = 0; /* indicates no copy is needed */
 549                 } else
 550                         dirname = thisname;
 551         } else {
 552                 basename = thisname;
 553                 dirname = NULL;
 554                 dirname_len = 0;
 555         }
 556         basename_len = strlen(basename) + 1; /* count the '\0' */
 557
 558         file_length = read_longint(f);
 559         if (!(flags & XMIT_SAME_TIME))
 560                 modtime = (time_t)read_int(f);
 561         if (!(flags & XMIT_SAME_MODE))
 562                 mode = from_wire_mode(read_int(f));
 563
 564         if (chmod_modes && !S_ISLNK(mode))
 565                 mode = tweak_mode(mode, chmod_modes);
 566
 567         if (preserve_uid && !(flags & XMIT_SAME_UID))
 568                 uid = (uid_t)read_int(f);
 569         if (preserve_gid && !(flags & XMIT_SAME_GID))
 570                 gid = (gid_t)read_int(f);
 571
 572         if ((preserve_devices && IS_DEVICE(mode))
 573          || (preserve_specials && IS_SPECIAL(mode))) {
 574                 if (protocol_version < 28) {
 575                         if (!(flags & XMIT_SAME_RDEV_pre28))
 576                                 rdev = (dev_t)read_int(f);
 577                 } else {
 578                         uint32 rdev_minor;
 579                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 580                                 rdev_major = read_int(f);
 581                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 582                                 rdev_minor = read_byte(f);
 583                         else
 584                                 rdev_minor = read_int(f);
 585                         rdev = makedev(rdev_major, rdev_minor);
 586                 }
 587         } else if (protocol_version < 28)
 588                 rdev = makedev(0, 0);
 589
 590 #ifdef SUPPORT_LINKS
 591         if (preserve_links && S_ISLNK(mode)) {
 592                 linkname_len = read_int(f) + 1; /* count the '\0' */
 593                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 594                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 595                                 linkname_len - 1);
 596                         overflow_exit("receive_file_entry");
 597                 }
 598         }
 599         else
 600 #endif
 601                 linkname_len = 0;
 602
 603         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 604
 605         alloc_len = file_struct_len + dirname_len + basename_len
 606                   + linkname_len + sum_len;
 607         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 608
 609         file = (struct file_struct *)bp;
 610         memset(bp, 0, file_struct_len);
 611         bp += file_struct_len;
 612
 613         file->modtime = modtime;
 614         file->length = file_length;
 615         file->mode = mode;
 616         file->uid = uid;
 617         file->gid = gid;
 618
 619         if (dirname_len) {
 620                 file->dirname = lastdir = bp;
 621                 lastdir_len = dirname_len - 1;
 622                 memcpy(bp, dirname, dirname_len - 1);
 623                 bp += dirname_len;
 624                 bp[-1] = '\0';
 625                 lastdir_depth = count_dir_elements(lastdir);
 626                 file->dir.depth = lastdir_depth + 1;
 627         } else if (dirname) {
 628                 file->dirname = dirname; /* we're reusing lastname */
 629                 file->dir.depth = lastdir_depth + 1;
 630         } else
 631                 file->dir.depth = 1;
 632
 633         if (S_ISDIR(mode)) {
 634                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 635                         file->dir.depth--;
 636                 if (flags & XMIT_TOP_DIR) {
 637                         in_del_hier = recurse;
 638                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 639                         if (relative_paths && del_hier_name_len > 2
 640                             && lastname[del_hier_name_len-1] == '.'
 641                             && lastname[del_hier_name_len-2] == '/')
 642                                 del_hier_name_len -= 2;
 643                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 644                 } else if (in_del_hier) {
 645                         if (!relative_paths || !del_hier_name_len
 646                          || (l1 >= del_hier_name_len
 647                           && lastname[del_hier_name_len] == '/'))
 648                                 file->flags |= FLAG_DEL_HERE;
 649                         else
 650                                 in_del_hier = 0;
 651                 }
 652         }
 653
 654         file->basename = bp;
 655         memcpy(bp, basename, basename_len);
 656         bp += basename_len;
 657
 658         if ((preserve_devices && IS_DEVICE(mode))
 659          || (preserve_specials && IS_SPECIAL(mode)))
 660                 file->u.rdev = rdev;
 661
 662 #ifdef SUPPORT_LINKS
 663         if (linkname_len) {
 664                 file->u.link = bp;
 665                 read_sbuf(f, bp, linkname_len - 1);
 666                 bp += linkname_len;
 667         }
 668 #endif
 669
 670 #ifdef SUPPORT_HARD_LINKS
 671         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 672                 flags |= XMIT_HAS_IDEV_DATA;
 673         if (flags & XMIT_HAS_IDEV_DATA) {
 674                 int64 inode;
 675                 if (protocol_version < 26) {
 676                         dev = read_int(f);
 677                         inode = read_int(f);
 678                 } else {
 679                         if (!(flags & XMIT_SAME_DEV))
 680                                 dev = read_longint(f);
 681                         inode = read_longint(f);
 682                 }
 683                 if (flist->hlink_pool) {
 684                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 685                             struct idev, 1, "inode_table");
 686                         file->F_INODE = inode;
 687                         file->F_DEV = dev;
 688                 }
 689         }
 690 #endif
 691
 692         if (always_checksum && (sum_len || protocol_version < 28)) {
 693                 char *sum;
 694                 if (sum_len) {
 695                         file->u.sum = sum = bp;
 696                         /*bp += sum_len;*/
 697                 } else {
 698                         /* Prior to 28, we get a useless set of nulls. */
 699                         sum = empty_sum;
 700                 }
 701                 read_buf(f, sum, checksum_len);
 702         }
 703
 704         return file;
 705 }
 706
 707 /**
 708  * Create a file_struct for a named file by reading its stat()
 709  * information and performing extensive checks against global
 710  * options.
 711  *
 712  * @return the new file, or NULL if there was an error or this file
 713  * should be excluded.
 714  *
 715  * @todo There is a small optimization opportunity here to avoid
 716  * stat()ing the file in some circumstances, which has a certain cost.
 717  * We are called immediately after doing readdir(), and so we may
 718  * already know the d_type of the file.  We could for example avoid
 719  * statting directories if we're not recursing, but this is not a very
 720  * important case.  Some systems may not have d_type.
 721  **/
 722 struct file_struct *make_file(char *fname, struct file_list *flist,
 723                               STRUCT_STAT *stp, unsigned short flags,
 724                               int filter_level)
 725 {
 726         static char *lastdir;
 727         static int lastdir_len = -1;
 728         struct file_struct *file;
 729         STRUCT_STAT st;
 730         char sum[SUM_LENGTH];
 731         char thisname[MAXPATHLEN];
 732         char linkname[MAXPATHLEN];
 733         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 734         char *basename, *dirname, *bp;
 735
 736         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 737                 lastdir_len = -1;
 738
 739         if (strlcpy(thisname, fname, sizeof thisname)
 740             >= sizeof thisname - flist_dir_len) {
 741                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 742                 return NULL;
 743         }
 744         clean_fname(thisname, 0);
 745         if (sanitize_paths)
 746                 sanitize_path(thisname, thisname, "", 0);
 747
 748         memset(sum, 0, SUM_LENGTH);
 749
 750         if (stp && S_ISDIR(stp->st_mode))
 751                 st = *stp; /* Needed for "symlink/." with --relative. */
 752         else if (readlink_stat(thisname, &st, linkname) != 0) {
 753                 int save_errno = errno;
 754                 /* See if file is excluded before reporting an error. */
 755                 if (filter_level != NO_FILTERS
 756                     && is_excluded(thisname, 0, filter_level))
 757                         return NULL;
 758                 if (save_errno == ENOENT) {
 759 #ifdef SUPPORT_LINKS
 760                         /* Avoid "vanished" error if symlink points nowhere. */
 761                         if (copy_links && do_lstat(thisname, &st) == 0
 762                             && S_ISLNK(st.st_mode)) {
 763                                 io_error |= IOERR_GENERAL;
 764                                 rprintf(FERROR, "symlink has no referent: %s\n",
 765                                         full_fname(thisname));
 766                         } else
 767 #endif
 768                         {
 769                                 enum logcode c = am_daemon && protocol_version < 28
 770                                     ? FERROR : FINFO;
 771                                 io_error |= IOERR_VANISHED;
 772                                 rprintf(c, "file has vanished: %s\n",
 773                                         full_fname(thisname));
 774                         }
 775                 } else {
 776                         io_error |= IOERR_GENERAL;
 777                         rsyserr(FERROR, save_errno, "readlink %s failed",
 778                                 full_fname(thisname));
 779                 }
 780                 return NULL;
 781         }
 782
 783         /* backup.c calls us with filter_level set to NO_FILTERS. */
 784         if (filter_level == NO_FILTERS)
 785                 goto skip_filters;
 786
 787         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 788                 rprintf(FINFO, "skipping directory %s\n", thisname);
 789                 return NULL;
 790         }
 791
 792         /* We only care about directories because we need to avoid recursing
 793          * into a mount-point directory, not to avoid copying a symlinked
 794          * file if -L (or similar) was specified. */
 795         if (one_file_system && st.st_dev != filesystem_dev
 796          && S_ISDIR(st.st_mode)) {
 797                 if (one_file_system > 1) {
 798                         if (verbose > 2) {
 799                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 800                                         thisname);
 801                         }
 802                         return NULL;
 803                 }
 804                 flags |= FLAG_MOUNT_POINT;
 805         }
 806
 807         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 808                 return NULL;
 809
 810         if (lp_ignore_nonreadable(module_id)) {
 811 #ifdef SUPPORT_LINKS
 812                 if (!S_ISLNK(st.st_mode))
 813 #endif
 814                         if (access(thisname, R_OK) != 0)
 815                                 return NULL;
 816         }
 817
 818   skip_filters:
 819
 820         if (verbose > 2) {
 821                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 822                         who_am_i(), thisname, filter_level);
 823         }
 824
 825         if ((basename = strrchr(thisname, '/')) != NULL) {
 826                 dirname_len = ++basename - thisname; /* counts future '\0' */
 827                 if (lastdir_len == dirname_len - 1
 828                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 829                         dirname = lastdir;
 830                         dirname_len = 0; /* indicates no copy is needed */
 831                 } else
 832                         dirname = thisname;
 833         } else {
 834                 basename = thisname;
 835                 dirname = NULL;
 836                 dirname_len = 0;
 837         }
 838         basename_len = strlen(basename) + 1; /* count the '\0' */
 839
 840 #ifdef SUPPORT_LINKS
 841         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 842 #else
 843         linkname_len = 0;
 844 #endif
 845
 846         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 847                 ? MD4_SUM_LENGTH : 0;
 848
 849         alloc_len = file_struct_len + dirname_len + basename_len
 850             + linkname_len + sum_len;
 851         if (flist)
 852                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 853         else {
 854                 if (!(bp = new_array(char, alloc_len)))
 855                         out_of_memory("make_file");
 856         }
 857
 858         file = (struct file_struct *)bp;
 859         memset(bp, 0, file_struct_len);
 860         bp += file_struct_len;
 861
 862         file->flags = flags;
 863         file->modtime = st.st_mtime;
 864         file->length = st.st_size;
 865         file->mode = st.st_mode;
 866         file->uid = st.st_uid;
 867         file->gid = st.st_gid;
 868
 869 #ifdef SUPPORT_HARD_LINKS
 870         if (flist && flist->hlink_pool) {
 871                 if (protocol_version < 28) {
 872                         if (S_ISREG(st.st_mode))
 873                                 file->link_u.idev = pool_talloc(
 874                                     flist->hlink_pool, struct idev, 1,
 875                                     "inode_table");
 876                 } else {
 877                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 878                                 file->link_u.idev = pool_talloc(
 879                                     flist->hlink_pool, struct idev, 1,
 880                                     "inode_table");
 881                 }
 882         }
 883         if (file->link_u.idev) {
 884                 file->F_DEV = st.st_dev;
 885                 file->F_INODE = st.st_ino;
 886         }
 887 #endif
 888
 889         if (dirname_len) {
 890                 file->dirname = lastdir = bp;
 891                 lastdir_len = dirname_len - 1;
 892                 memcpy(bp, dirname, dirname_len - 1);
 893                 bp += dirname_len;
 894                 bp[-1] = '\0';
 895         } else if (dirname)
 896                 file->dirname = dirname;
 897
 898         file->basename = bp;
 899         memcpy(bp, basename, basename_len);
 900         bp += basename_len;
 901
 902 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 903         if ((preserve_devices && IS_DEVICE(st.st_mode))
 904          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 905                 file->u.rdev = st.st_rdev;
 906 #endif
 907
 908 #ifdef SUPPORT_LINKS
 909         if (linkname_len) {
 910                 file->u.link = bp;
 911                 memcpy(bp, linkname, linkname_len);
 912                 bp += linkname_len;
 913         }
 914 #endif
 915
 916         if (sum_len) {
 917                 file->u.sum = bp;
 918                 file_checksum(thisname, bp, st.st_size);
 919                 /*bp += sum_len;*/
 920         }
 921
 922         file->dir.root = flist_dir;
 923
 924         /* This code is only used by the receiver when it is building
 925          * a list of files for a delete pass. */
 926         if (keep_dirlinks && linkname_len && flist) {
 927                 STRUCT_STAT st2;
 928                 int save_mode = file->mode;
 929                 file->mode = S_IFDIR; /* Find a directory with our name. */
 930                 if (flist_find(the_file_list, file) >= 0
 931                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 932                         file->modtime = st2.st_mtime;
 933                         file->length = st2.st_size;
 934                         file->mode = st2.st_mode;
 935                         file->uid = st2.st_uid;
 936                         file->gid = st2.st_gid;
 937                         file->u.link = NULL;
 938                 } else
 939                         file->mode = save_mode;
 940         }
 941
 942         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 943                 stats.total_size += st.st_size;
 944
 945         return file;
 946 }
 947
 948 static struct file_struct *send_file_name(int f, struct file_list *flist,
 949                                           char *fname, STRUCT_STAT *stp,
 950                                           unsigned short flags)
 951 {
 952         struct file_struct *file;
 953
 954         file = make_file(fname, flist, stp, flags,
 955                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 956         if (!file)
 957                 return NULL;
 958
 959         if (chmod_modes && !S_ISLNK(file->mode))
 960                 file->mode = tweak_mode(file->mode, chmod_modes);
 961
 962         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 963
 964         flist_expand(flist);
 965
 966         if (file->basename[0]) {
 967                 flist->files[flist->count++] = file;
 968                 send_file_entry(file, f);
 969         }
 970         return file;
 971 }
 972
 973 static void send_if_directory(int f, struct file_list *flist,
 974                               struct file_struct *file,
 975                               char *fbuf, unsigned int ol)
 976 {
 977         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 978
 979         if (S_ISDIR(file->mode)
 980             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 981                 void *save_filters;
 982                 unsigned int len = strlen(fbuf);
 983                 if (len > 1 && fbuf[len-1] == '/')
 984                         fbuf[--len] = '\0';
 985                 if (len >= MAXPATHLEN - 1) {
 986                         io_error |= IOERR_GENERAL;
 987                         rprintf(FERROR, "skipping long-named directory: %s\n",
 988                                 full_fname(fbuf));
 989                         return;
 990                 }
 991                 save_filters = push_local_filters(fbuf, len);
 992                 send_directory(f, flist, fbuf, len);
 993                 pop_local_filters(save_filters);
 994                 fbuf[ol] = '\0';
 995                 if (is_dot_dir)
 996                         fbuf[ol-1] = '.';
 997         }
 998 }
 999
1000 /* This function is normally called by the sender, but the receiving side also
1001  * calls it from get_dirlist() with f set to -1 so that we just construct the
1002  * file list in memory without sending it over the wire.  Also, get_dirlist()
1003  * might call this with f set to -2, which also indicates that local filter
1004  * rules should be ignored. */
1005 static void send_directory(int f, struct file_list *flist,
1006                            char *fbuf, int len)
1007 {
1008         struct dirent *di;
1009         unsigned remainder;
1010         char *p;
1011         DIR *d;
1012         int start = flist->count;
1013
1014         if (!(d = opendir(fbuf))) {
1015                 io_error |= IOERR_GENERAL;
1016                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1017                 return;
1018         }
1019
1020         p = fbuf + len;
1021         if (len != 1 || *fbuf != '/')
1022                 *p++ = '/';
1023         *p = '\0';
1024         remainder = MAXPATHLEN - (p - fbuf);
1025
1026         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1027                 char *dname = d_name(di);
1028                 if (dname[0] == '.' && (dname[1] == '\0'
1029                     || (dname[1] == '.' && dname[2] == '\0')))
1030                         continue;
1031                 if (strlcpy(p, dname, remainder) >= remainder) {
1032                         io_error |= IOERR_GENERAL;
1033                         rprintf(FINFO,
1034                                 "cannot send long-named file %s\n",
1035                                 full_fname(fbuf));
1036                         continue;
1037                 }
1038
1039                 send_file_name(f, flist, fbuf, NULL, 0);
1040         }
1041
1042         fbuf[len] = '\0';
1043
1044         if (errno) {
1045                 io_error |= IOERR_GENERAL;
1046                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1047         }
1048
1049         closedir(d);
1050
1051         if (recurse) {
1052                 int i, end = flist->count - 1;
1053                 for (i = start; i <= end; i++)
1054                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1055         }
1056 }
1057
1058 struct file_list *send_file_list(int f, int argc, char *argv[])
1059 {
1060         int len;
1061         STRUCT_STAT st;
1062         char *p, *dir, olddir[sizeof curr_dir];
1063         char lastpath[MAXPATHLEN] = "";
1064         struct file_list *flist;
1065         struct timeval start_tv, end_tv;
1066         int64 start_write;
1067         int use_ff_fd = 0;
1068
1069         if (show_filelist_p())
1070                 start_filelist_progress("building file list");
1071
1072         start_write = stats.total_written;
1073         gettimeofday(&start_tv, NULL);
1074
1075         flist = flist_new(WITH_HLINK, "send_file_list");
1076
1077         io_start_buffering_out();
1078         if (filesfrom_fd >= 0) {
1079                 if (argv[0] && !push_dir(argv[0])) {
1080                         rsyserr(FERROR, errno, "push_dir %s failed",
1081                                 full_fname(argv[0]));
1082                         exit_cleanup(RERR_FILESELECT);
1083                 }
1084                 use_ff_fd = 1;
1085         }
1086
1087         while (1) {
1088                 char fbuf[MAXPATHLEN];
1089                 char *fn;
1090                 int is_dot_dir;
1091
1092                 if (use_ff_fd) {
1093                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1094                                 break;
1095                         sanitize_path(fbuf, fbuf, "", 0);
1096                 } else {
1097                         if (argc-- == 0)
1098                                 break;
1099                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1100                         if (sanitize_paths)
1101                                 sanitize_path(fbuf, fbuf, "", 0);
1102                 }
1103
1104                 len = strlen(fbuf);
1105                 if (relative_paths) {
1106                         /* We clean up fbuf below. */
1107                         is_dot_dir = 0;
1108                 } else if (!len || fbuf[len - 1] == '/') {
1109                         if (len == 2 && fbuf[0] == '.') {
1110                                 /* Turn "./" into just "." rather than "./." */
1111                                 fbuf[1] = '\0';
1112                         } else {
1113                                 if (len + 1 >= MAXPATHLEN)
1114                                         overflow_exit("send_file_list");
1115                                 fbuf[len++] = '.';
1116                                 fbuf[len] = '\0';
1117                         }
1118                         is_dot_dir = 1;
1119                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1120                     && (len == 2 || fbuf[len-3] == '/')) {
1121                         if (len + 2 >= MAXPATHLEN)
1122                                 overflow_exit("send_file_list");
1123                         fbuf[len++] = '/';
1124                         fbuf[len++] = '.';
1125                         fbuf[len] = '\0';
1126                         is_dot_dir = 1;
1127                 } else {
1128                         is_dot_dir = fbuf[len-1] == '.'
1129                                    && (len == 1 || fbuf[len-2] == '/');
1130                 }
1131
1132                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1133                         io_error |= IOERR_GENERAL;
1134                         rsyserr(FERROR, errno, "link_stat %s failed",
1135                                 full_fname(fbuf));
1136                         continue;
1137                 }
1138
1139                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1140                         rprintf(FINFO, "skipping directory %s\n", 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 {
1160                         if ((p = strstr(fbuf, "/./")) != NULL) {
1161                                 *p = '\0';
1162                                 if (p == fbuf)
1163                                         dir = "/";
1164                                 else
1165                                         dir = fbuf;
1166                                 len -= p - fbuf + 3;
1167                                 fn = p + 3;
1168                         } else
1169                                 fn = fbuf;
1170                         /* Get rid of trailing "/" and "/.". */
1171                         while (len) {
1172                                 if (fn[len - 1] == '/') {
1173                                         is_dot_dir = 1;
1174                                         if (!--len && !dir) {
1175                                                 len++;
1176                                                 break;
1177                                         }
1178                                 }
1179                                 else if (len >= 2 && fn[len - 1] == '.'
1180                                                   && fn[len - 2] == '/') {
1181                                         is_dot_dir = 1;
1182                                         if (!(len -= 2) && !dir) {
1183                                                 len++;
1184                                                 break;
1185                                         }
1186                                 } else
1187                                         break;
1188                         }
1189                         fn[len] = '\0';
1190                         /* Reject a ".." dir in the active part of the path. */
1191                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1192                                 if ((p[2] == '/' || p[2] == '\0')
1193                                  && (p == fn || p[-1] == '/')) {
1194                                         rprintf(FERROR,
1195                                             "found \"..\" dir in relative path: %s\n",
1196                                             fbuf);
1197                                         exit_cleanup(RERR_SYNTAX);
1198                                 }
1199                         }
1200                 }
1201
1202                 if (!*fn) {
1203                         len = 1;
1204                         fn = ".";
1205                 }
1206
1207                 if (dir && *dir) {
1208                         static char *lastdir;
1209                         static int lastdir_len;
1210
1211                         strlcpy(olddir, curr_dir, sizeof olddir);
1212
1213                         if (!push_dir(dir)) {
1214                                 io_error |= IOERR_GENERAL;
1215                                 rsyserr(FERROR, errno, "push_dir %s failed",
1216                                         full_fname(dir));
1217                                 continue;
1218                         }
1219
1220                         if (lastdir && strcmp(lastdir, dir) == 0) {
1221                                 flist_dir = lastdir;
1222                                 flist_dir_len = lastdir_len;
1223                         } else {
1224                                 flist_dir = lastdir = strdup(dir);
1225                                 flist_dir_len = lastdir_len = strlen(dir);
1226                         }
1227                 }
1228
1229                 if (fn != fbuf)
1230                         memmove(fbuf, fn, len + 1);
1231
1232                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1233                         /* Send the implied directories at the start of the
1234                          * source spec, so we get their permissions right. */
1235                         char *lp = lastpath, *slash = fbuf;
1236                         *p = '\0';
1237                         /* Skip any initial directories in our path that we
1238                          * have in common with lastpath. */
1239                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1240                                 if (*fn == '/')
1241                                         slash = fn;
1242                         }
1243                         *p = '/';
1244                         if (fn != p || (*lp && *lp != '/')) {
1245                                 int save_copy_links = copy_links;
1246                                 int save_xfer_dirs = xfer_dirs;
1247                                 copy_links |= copy_unsafe_links;
1248                                 xfer_dirs = 1;
1249                                 while ((slash = strchr(slash+1, '/')) != 0) {
1250                                         *slash = '\0';
1251                                         send_file_name(f, flist, fbuf, NULL, 0);
1252                                         *slash = '/';
1253                                 }
1254                                 copy_links = save_copy_links;
1255                                 xfer_dirs = save_xfer_dirs;
1256                                 *p = '\0';
1257                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1258                                 *p = '/';
1259                         }
1260                 }
1261
1262                 if (one_file_system)
1263                         filesystem_dev = st.st_dev;
1264
1265                 if (recurse || (xfer_dirs && is_dot_dir)) {
1266                         struct file_struct *file;
1267                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1268                         if (file)
1269                                 send_if_directory(f, flist, file, fbuf, len);
1270                 } else
1271                         send_file_name(f, flist, fbuf, &st, 0);
1272
1273                 if (olddir[0]) {
1274                         flist_dir = NULL;
1275                         flist_dir_len = 0;
1276                         if (!pop_dir(olddir)) {
1277                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1278                                         full_fname(olddir));
1279                                 exit_cleanup(RERR_FILESELECT);
1280                         }
1281                 }
1282         }
1283
1284         gettimeofday(&end_tv, NULL);
1285         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1286                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1287         if (stats.flist_buildtime == 0)
1288                 stats.flist_buildtime = 1;
1289         start_tv = end_tv;
1290
1291         send_file_entry(NULL, f);
1292
1293         if (show_filelist_p())
1294                 finish_filelist_progress(flist);
1295
1296         gettimeofday(&end_tv, NULL);
1297         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1298                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1299
1300         if (flist->hlink_pool) {
1301                 pool_destroy(flist->hlink_pool);
1302                 flist->hlink_pool = NULL;
1303         }
1304
1305         /* Sort the list without removing any duplicates.  This allows the
1306          * receiving side to ask for any name they like, which gives us the
1307          * flexibility to change the way we unduplicate names in the future
1308          * without causing a compatibility problem with older versions. */
1309         clean_flist(flist, 0, 0);
1310
1311         send_uid_list(f);
1312
1313         /* send the io_error flag */
1314         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1315
1316         io_end_buffering();
1317         stats.flist_size = stats.total_written - start_write;
1318         stats.num_files = flist->count;
1319
1320         if (verbose > 3)
1321                 output_flist(flist);
1322
1323         if (verbose > 2)
1324                 rprintf(FINFO, "send_file_list done\n");
1325
1326         return flist;
1327 }
1328
1329 struct file_list *recv_file_list(int f)
1330 {
1331         struct file_list *flist;
1332         unsigned short flags;
1333         int64 start_read;
1334
1335         if (show_filelist_p())
1336                 start_filelist_progress("receiving file list");
1337
1338         start_read = stats.total_read;
1339
1340         flist = flist_new(WITH_HLINK, "recv_file_list");
1341
1342         flist->count = 0;
1343         flist->malloced = 1000;
1344         flist->files = new_array(struct file_struct *, flist->malloced);
1345         if (!flist->files)
1346                 goto oom;
1347
1348         while ((flags = read_byte(f)) != 0) {
1349                 struct file_struct *file;
1350
1351                 flist_expand(flist);
1352
1353                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1354                         flags |= read_byte(f) << 8;
1355                 file = receive_file_entry(flist, flags, f);
1356
1357                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1358                         stats.total_size += file->length;
1359
1360                 flist->files[flist->count++] = file;
1361
1362                 maybe_emit_filelist_progress(flist->count);
1363
1364                 if (verbose > 2) {
1365                         rprintf(FINFO, "recv_file_name(%s)\n",
1366                                 f_name(file, NULL));
1367                 }
1368         }
1369         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1370
1371         if (verbose > 2)
1372                 rprintf(FINFO, "received %d names\n", flist->count);
1373
1374         if (show_filelist_p())
1375                 finish_filelist_progress(flist);
1376
1377         clean_flist(flist, relative_paths, 1);
1378
1379         if (f >= 0) {
1380                 recv_uid_list(f, flist);
1381
1382                 /* Recv the io_error flag */
1383                 if (lp_ignore_errors(module_id) || ignore_errors)
1384                         read_int(f);
1385                 else
1386                         io_error |= read_int(f);
1387         }
1388
1389         if (verbose > 3)
1390                 output_flist(flist);
1391
1392         if (list_only) {
1393                 int i;
1394                 for (i = 0; i < flist->count; i++)
1395                         list_file_entry(flist->files[i]);
1396         }
1397
1398         if (verbose > 2)
1399                 rprintf(FINFO, "recv_file_list done\n");
1400
1401         stats.flist_size = stats.total_read - start_read;
1402         stats.num_files = flist->count;
1403
1404         return flist;
1405
1406   oom:
1407         out_of_memory("recv_file_list");
1408         return NULL;            /* not reached */
1409 }
1410
1411 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1412 {
1413         return f_name_cmp(*file1, *file2);
1414 }
1415
1416 /* Search for an identically-named item in the file list.  Note that the
1417  * items must agree in their directory-ness, or no match is returned. */
1418 int flist_find(struct file_list *flist, struct file_struct *f)
1419 {
1420         int low = flist->low, high = flist->high;
1421         int diff, mid, mid_up;
1422
1423         while (low <= high) {
1424                 mid = (low + high) / 2;
1425                 if (flist->files[mid]->basename)
1426                         mid_up = mid;
1427                 else {
1428                         /* Scan for the next non-empty entry using the cached
1429                          * distance values.  If the value isn't fully up-to-
1430                          * date, update it. */
1431                         mid_up = mid + flist->files[mid]->dir.depth;
1432                         if (!flist->files[mid_up]->basename) {
1433                                 do {
1434                                     mid_up += flist->files[mid_up]->dir.depth;
1435                                 } while (!flist->files[mid_up]->basename);
1436                                 flist->files[mid]->dir.depth = mid_up - mid;
1437                         }
1438                         if (mid_up > high) {
1439                                 /* If there's nothing left above us, set high to
1440                                  * a non-empty entry below us and continue. */
1441                                 high = mid - flist->files[mid]->length;
1442                                 if (!flist->files[high]->basename) {
1443                                         do {
1444                                             high -= flist->files[high]->length;
1445                                         } while (!flist->files[high]->basename);
1446                                         flist->files[mid]->length = mid - high;
1447                                 }
1448                                 continue;
1449                         }
1450                 }
1451                 diff = f_name_cmp(flist->files[mid_up], f);
1452                 if (diff == 0) {
1453                         if (protocol_version < 29
1454                             && S_ISDIR(flist->files[mid_up]->mode)
1455                             != S_ISDIR(f->mode))
1456                                 return -1;
1457                         return mid_up;
1458                 }
1459                 if (diff < 0)
1460                         low = mid_up + 1;
1461                 else
1462                         high = mid - 1;
1463         }
1464         return -1;
1465 }
1466
1467 /*
1468  * Free up any resources a file_struct has allocated
1469  * and clear the file.
1470  */
1471 void clear_file(struct file_struct *file, struct file_list *flist)
1472 {
1473         if (flist->hlink_pool && file->link_u.idev)
1474                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1475         memset(file, 0, file_struct_len);
1476         /* In an empty entry, dir.depth is an offset to the next non-empty
1477          * entry.  Likewise for length in the opposite direction.  We assume
1478          * that we're alone for now since flist_find() will adjust the counts
1479          * it runs into that aren't up-to-date. */
1480         file->length = file->dir.depth = 1;
1481 }
1482
1483 /*
1484  * allocate a new file list
1485  */
1486 struct file_list *flist_new(int with_hlink, char *msg)
1487 {
1488         struct file_list *flist;
1489
1490         flist = new(struct file_list);
1491         if (!flist)
1492                 out_of_memory(msg);
1493
1494         memset(flist, 0, sizeof (struct file_list));
1495
1496         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1497             out_of_memory, POOL_INTERN)))
1498                 out_of_memory(msg);
1499
1500 #ifdef SUPPORT_HARD_LINKS
1501         if (with_hlink && preserve_hard_links) {
1502                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1503                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1504                         out_of_memory(msg);
1505         }
1506 #endif
1507
1508         return flist;
1509 }
1510
1511 /*
1512  * free up all elements in a flist
1513  */
1514 void flist_free(struct file_list *flist)
1515 {
1516         pool_destroy(flist->file_pool);
1517         pool_destroy(flist->hlink_pool);
1518         free(flist->files);
1519         free(flist);
1520 }
1521
1522 /*
1523  * This routine ensures we don't have any duplicate names in our file list.
1524  * duplicate names can cause corruption because of the pipelining
1525  */
1526 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1527 {
1528         char fbuf[MAXPATHLEN];
1529         int i, prev_i = 0;
1530
1531         if (!flist)
1532                 return;
1533         if (flist->count == 0) {
1534                 flist->high = -1;
1535                 return;
1536         }
1537
1538         qsort(flist->files, flist->count,
1539             sizeof flist->files[0], (int (*)())file_compare);
1540
1541         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1542                 if (flist->files[i]->basename) {
1543                         prev_i = i;
1544                         break;
1545                 }
1546         }
1547         flist->low = prev_i;
1548         while (++i < flist->count) {
1549                 int j;
1550                 struct file_struct *file = flist->files[i];
1551
1552                 if (!file->basename)
1553                         continue;
1554                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1555                         j = prev_i;
1556                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1557                         int save_mode = file->mode;
1558                         /* Make sure that this directory doesn't duplicate a
1559                          * non-directory earlier in the list. */
1560                         flist->high = prev_i;
1561                         file->mode = S_IFREG;
1562                         j = flist_find(flist, file);
1563                         file->mode = save_mode;
1564                 } else
1565                         j = -1;
1566                 if (j >= 0) {
1567                         struct file_struct *fp = flist->files[j];
1568                         int keep, drop;
1569                         /* If one is a dir and the other is not, we want to
1570                          * keep the dir because it might have contents in the
1571                          * list. */
1572                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1573                                 if (S_ISDIR(file->mode))
1574                                         keep = i, drop = j;
1575                                 else
1576                                         keep = j, drop = i;
1577                         } else
1578                                 keep = j, drop = i;
1579                         if (verbose > 1 && !am_server) {
1580                                 rprintf(FINFO,
1581                                         "removing duplicate name %s from file list (%d)\n",
1582                                         f_name(file, fbuf), drop);
1583                         }
1584                         /* Make sure we don't lose track of a user-specified
1585                          * top directory. */
1586                         flist->files[keep]->flags |= flist->files[drop]->flags
1587                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1588
1589                         clear_file(flist->files[drop], flist);
1590
1591                         if (keep == i) {
1592                                 if (flist->low == drop) {
1593                                         for (j = drop + 1;
1594                                              j < i && !flist->files[j]->basename;
1595                                              j++) {}
1596                                         flist->low = j;
1597                                 }
1598                                 prev_i = i;
1599                         }
1600                 } else
1601                         prev_i = i;
1602         }
1603         flist->high = no_dups ? prev_i : flist->count - 1;
1604
1605         if (strip_root) {
1606                 /* We need to strip off the leading slashes for relative
1607                  * paths, but this must be done _after_ the sorting phase. */
1608                 for (i = flist->low; i <= flist->high; i++) {
1609                         struct file_struct *file = flist->files[i];
1610
1611                         if (!file->dirname)
1612                                 continue;
1613                         while (*file->dirname == '/')
1614                                 file->dirname++;
1615                         if (!*file->dirname)
1616                                 file->dirname = NULL;
1617                 }
1618         }
1619
1620         if (prune_empty_dirs && no_dups) {
1621                 int j, prev_depth = 0;
1622
1623                 prev_i = 0; /* It's OK that this isn't really true. */
1624
1625                 for (i = flist->low; i <= flist->high; i++) {
1626                         struct file_struct *fp, *file = flist->files[i];
1627
1628                         /* This temporarily abuses the dir.depth value for a
1629                          * directory that is in a chain that might get pruned.
1630                          * We restore the old value if it gets a reprieve. */
1631                         if (S_ISDIR(file->mode) && file->dir.depth) {
1632                                 /* Dump empty dirs when coming back down. */
1633                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1634                                         fp = flist->files[prev_i];
1635                                         if (fp->dir.depth >= 0)
1636                                                 break;
1637                                         prev_i = -fp->dir.depth-1;
1638                                         clear_file(fp, flist);
1639                                 }
1640                                 prev_depth = file->dir.depth;
1641                                 if (is_excluded(f_name(file, fbuf), 1,
1642                                                        ALL_FILTERS)) {
1643                                         /* Keep dirs through this dir. */
1644                                         for (j = prev_depth-1; ; j--) {
1645                                                 fp = flist->files[prev_i];
1646                                                 if (fp->dir.depth >= 0)
1647                                                         break;
1648                                                 prev_i = -fp->dir.depth-1;
1649                                                 fp->dir.depth = j;
1650                                         }
1651                                 } else
1652                                         file->dir.depth = -prev_i-1;
1653                                 prev_i = i;
1654                         } else {
1655                                 /* Keep dirs through this non-dir. */
1656                                 for (j = prev_depth; ; j--) {
1657                                         fp = flist->files[prev_i];
1658                                         if (fp->dir.depth >= 0)
1659                                                 break;
1660                                         prev_i = -fp->dir.depth-1;
1661                                         fp->dir.depth = j;
1662                                 }
1663                         }
1664                 }
1665                 /* Dump empty all remaining empty dirs. */
1666                 while (1) {
1667                         struct file_struct *fp = flist->files[prev_i];
1668                         if (fp->dir.depth >= 0)
1669                                 break;
1670                         prev_i = -fp->dir.depth-1;
1671                         clear_file(fp, flist);
1672                 }
1673
1674                 for (i = flist->low; i <= flist->high; i++) {
1675                         if (flist->files[i]->basename)
1676                                 break;
1677                 }
1678                 flist->low = i;
1679                 for (i = flist->high; i >= flist->low; i--) {
1680                         if (flist->files[i]->basename)
1681                                 break;
1682                 }
1683                 flist->high = i;
1684         }
1685 }
1686
1687 static void output_flist(struct file_list *flist)
1688 {
1689         char uidbuf[16], gidbuf[16], depthbuf[16];
1690         struct file_struct *file;
1691         const char *who = who_am_i();
1692         int i;
1693
1694         for (i = 0; i < flist->count; i++) {
1695                 file = flist->files[i];
1696                 if ((am_root || am_sender) && preserve_uid)
1697                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1698                 else
1699                         *uidbuf = '\0';
1700                 if (preserve_gid && file->gid != GID_NONE)
1701                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1702                 else
1703                         *gidbuf = '\0';
1704                 if (!am_sender)
1705                         sprintf(depthbuf, "%d", file->dir.depth);
1706                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1707                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1708                         file->dirname ? file->dirname : "",
1709                         file->dirname ? "/" : "", NS(file->basename),
1710                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1711                         (double)file->length, uidbuf, gidbuf, file->flags);
1712         }
1713 }
1714
1715 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1716 enum fnc_type { t_PATH, t_ITEM };
1717
1718 /* Compare the names of two file_struct entities, similar to how strcmp()
1719  * would do if it were operating on the joined strings.
1720  *
1721  * Some differences beginning with protocol_version 29: (1) directory names
1722  * are compared with an assumed trailing slash so that they compare in a
1723  * way that would cause them to sort immediately prior to any content they
1724  * may have; (2) a directory of any name compares after a non-directory of
1725  * any name at the same depth; (3) a directory with name "." compares prior
1726  * to anything else.  These changes mean that a directory and a non-dir
1727  * with the same name will not compare as equal (protocol_version >= 29).
1728  *
1729  * The dirname component can be an empty string, but the basename component
1730  * cannot (and never is in the current codebase).  The basename component
1731  * may be NULL (for a removed item), in which case it is considered to be
1732  * after any existing item. */
1733 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1734 {
1735         int dif;
1736         const uchar *c1, *c2;
1737         enum fnc_state state1, state2;
1738         enum fnc_type type1, type2;
1739         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1740
1741         if (!f1 || !f1->basename) {
1742                 if (!f2 || !f2->basename)
1743                         return 0;
1744                 return -1;
1745         }
1746         if (!f2 || !f2->basename)
1747                 return 1;
1748
1749         c1 = (uchar*)f1->dirname;
1750         c2 = (uchar*)f2->dirname;
1751         if (c1 == c2)
1752                 c1 = c2 = NULL;
1753         if (!c1) {
1754                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1755                 c1 = (uchar*)f1->basename;
1756                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1757                         type1 = t_ITEM;
1758                         state1 = s_TRAILING;
1759                         c1 = (uchar*)"";
1760                 } else
1761                         state1 = s_BASE;
1762         } else if (!*c1) {
1763                 type1 = t_path;
1764                 state1 = s_SLASH;
1765                 c1 = (uchar*)"/";
1766         } else {
1767                 type1 = t_path;
1768                 state1 = s_DIR;
1769         }
1770         if (!c2) {
1771                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1772                 c2 = (uchar*)f2->basename;
1773                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1774                         type2 = t_ITEM;
1775                         state2 = s_TRAILING;
1776                         c2 = (uchar*)"";
1777                 } else
1778                         state2 = s_BASE;
1779         } else if (!*c2) {
1780                 type2 = t_path;
1781                 state2 = s_SLASH;
1782                 c2 = (uchar*)"/";
1783         } else {
1784                 type2 = t_path;
1785                 state2 = s_DIR;
1786         }
1787
1788         if (type1 != type2)
1789                 return type1 == t_PATH ? 1 : -1;
1790
1791         while (1) {
1792                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1793                         break;
1794                 if (!*c1) {
1795                         switch (state1) {
1796                         case s_DIR:
1797                                 state1 = s_SLASH;
1798                                 c1 = (uchar*)"/";
1799                                 break;
1800                         case s_SLASH:
1801                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1802                                 c1 = (uchar*)f1->basename;
1803                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1804                                         type1 = t_ITEM;
1805                                         state1 = s_TRAILING;
1806                                         c1 = (uchar*)"";
1807                                 } else
1808                                         state1 = s_BASE;
1809                                 break;
1810                         case s_BASE:
1811                                 state1 = s_TRAILING;
1812                                 if (type1 == t_PATH) {
1813                                         c1 = (uchar*)"/";
1814                                         break;
1815                                 }
1816                                 /* FALL THROUGH */
1817                         case s_TRAILING:
1818                                 type1 = t_ITEM;
1819                                 break;
1820                         }
1821                         if (*c2 && type1 != type2)
1822                                 return type1 == t_PATH ? 1 : -1;
1823                 }
1824                 if (!*c2) {
1825                         switch (state2) {
1826                         case s_DIR:
1827                                 state2 = s_SLASH;
1828                                 c2 = (uchar*)"/";
1829                                 break;
1830                         case s_SLASH:
1831                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1832                                 c2 = (uchar*)f2->basename;
1833                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1834                                         type2 = t_ITEM;
1835                                         state2 = s_TRAILING;
1836                                         c2 = (uchar*)"";
1837                                 } else
1838                                         state2 = s_BASE;
1839                                 break;
1840                         case s_BASE:
1841                                 state2 = s_TRAILING;
1842                                 if (type2 == t_PATH) {
1843                                         c2 = (uchar*)"/";
1844                                         break;
1845                                 }
1846                                 /* FALL THROUGH */
1847                         case s_TRAILING:
1848                                 if (!*c1)
1849                                         return 0;
1850                                 type2 = t_ITEM;
1851                                 break;
1852                         }
1853                         if (type1 != type2)
1854                                 return type1 == t_PATH ? 1 : -1;
1855                 }
1856         }
1857
1858         return dif;
1859 }
1860
1861 /* Return a copy of the full filename of a flist entry, using the indicated
1862  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1863  * done because we checked the size when creating the file_struct entry.
1864  */
1865 char *f_name(struct file_struct *f, char *fbuf)
1866 {
1867         if (!f || !f->basename)
1868                 return NULL;
1869
1870         if (!fbuf) {
1871                 static char names[5][MAXPATHLEN];
1872                 static unsigned int n;
1873
1874                 n = (n + 1) % (sizeof names / sizeof names[0]);
1875
1876                 fbuf = names[n];
1877         }
1878
1879         if (f->dirname) {
1880                 int len = strlen(f->dirname);
1881                 memcpy(fbuf, f->dirname, len);
1882                 fbuf[len] = '/';
1883                 strcpy(fbuf + len + 1, f->basename);
1884         } else
1885                 strcpy(fbuf, f->basename);
1886
1887         return fbuf;
1888 }
1889
1890 /* Do a non-recursive scan of the named directory, possibly ignoring all
1891  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1892  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1893  * buffer (the functions we call will append names onto the end, but the old
1894  * dir value will be restored on exit). */
1895 struct file_list *get_dirlist(char *dirname, int dlen,
1896                               int ignore_filter_rules)
1897 {
1898         struct file_list *dirlist;
1899         char dirbuf[MAXPATHLEN];
1900         int save_recurse = recurse;
1901         int save_xfer_dirs = xfer_dirs;
1902
1903         if (dlen < 0) {
1904                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1905                 if (dlen >= MAXPATHLEN)
1906                         return NULL;
1907                 dirname = dirbuf;
1908         }
1909
1910         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1911
1912         recurse = 0;
1913         xfer_dirs = 1;
1914         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1915         xfer_dirs = save_xfer_dirs;
1916         recurse = save_recurse;
1917         if (do_progress)
1918                 flist_count_offset += dirlist->count;
1919
1920         clean_flist(dirlist, 0, 0);
1921
1922         if (verbose > 3)
1923                 output_flist(dirlist);
1924
1925         return dirlist;
1926 }