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
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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                 if (sanitize_paths)
 667                         sanitize_path(bp, bp, "", lastdir_depth);
 668                 bp += linkname_len;
 669         }
 670 #endif
 671
 672 #ifdef SUPPORT_HARD_LINKS
 673         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 674                 flags |= XMIT_HAS_IDEV_DATA;
 675         if (flags & XMIT_HAS_IDEV_DATA) {
 676                 int64 inode;
 677                 if (protocol_version < 26) {
 678                         dev = read_int(f);
 679                         inode = read_int(f);
 680                 } else {
 681                         if (!(flags & XMIT_SAME_DEV))
 682                                 dev = read_longint(f);
 683                         inode = read_longint(f);
 684                 }
 685                 if (flist->hlink_pool) {
 686                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 687                             struct idev, 1, "inode_table");
 688                         file->F_INODE = inode;
 689                         file->F_DEV = dev;
 690                 }
 691         }
 692 #endif
 693
 694         if (always_checksum && (sum_len || protocol_version < 28)) {
 695                 char *sum;
 696                 if (sum_len) {
 697                         file->u.sum = sum = bp;
 698                         /*bp += sum_len;*/
 699                 } else {
 700                         /* Prior to 28, we get a useless set of nulls. */
 701                         sum = empty_sum;
 702                 }
 703                 read_buf(f, sum, checksum_len);
 704         }
 705
 706         return file;
 707 }
 708
 709 /**
 710  * Create a file_struct for a named file by reading its stat()
 711  * information and performing extensive checks against global
 712  * options.
 713  *
 714  * @return the new file, or NULL if there was an error or this file
 715  * should be excluded.
 716  *
 717  * @todo There is a small optimization opportunity here to avoid
 718  * stat()ing the file in some circumstances, which has a certain cost.
 719  * We are called immediately after doing readdir(), and so we may
 720  * already know the d_type of the file.  We could for example avoid
 721  * statting directories if we're not recursing, but this is not a very
 722  * important case.  Some systems may not have d_type.
 723  **/
 724 struct file_struct *make_file(char *fname, struct file_list *flist,
 725                               STRUCT_STAT *stp, unsigned short flags,
 726                               int filter_level)
 727 {
 728         static char *lastdir;
 729         static int lastdir_len = -1;
 730         struct file_struct *file;
 731         STRUCT_STAT st;
 732         char sum[SUM_LENGTH];
 733         char thisname[MAXPATHLEN];
 734         char linkname[MAXPATHLEN];
 735         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 736         char *basename, *dirname, *bp;
 737
 738         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 739                 lastdir_len = -1;
 740
 741         if (strlcpy(thisname, fname, sizeof thisname)
 742             >= sizeof thisname - flist_dir_len) {
 743                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 744                 return NULL;
 745         }
 746         clean_fname(thisname, 0);
 747         if (sanitize_paths)
 748                 sanitize_path(thisname, thisname, "", 0);
 749
 750         memset(sum, 0, SUM_LENGTH);
 751
 752         if (stp && S_ISDIR(stp->st_mode))
 753                 st = *stp; /* Needed for "symlink/." with --relative. */
 754         else if (readlink_stat(thisname, &st, linkname) != 0) {
 755                 int save_errno = errno;
 756                 /* See if file is excluded before reporting an error. */
 757                 if (filter_level != NO_FILTERS
 758                     && is_excluded(thisname, 0, filter_level))
 759                         return NULL;
 760                 if (save_errno == ENOENT) {
 761 #ifdef SUPPORT_LINKS
 762                         /* Avoid "vanished" error if symlink points nowhere. */
 763                         if (copy_links && do_lstat(thisname, &st) == 0
 764                             && S_ISLNK(st.st_mode)) {
 765                                 io_error |= IOERR_GENERAL;
 766                                 rprintf(FERROR, "symlink has no referent: %s\n",
 767                                         full_fname(thisname));
 768                         } else
 769 #endif
 770                         {
 771                                 enum logcode c = am_daemon && protocol_version < 28
 772                                     ? FERROR : FINFO;
 773                                 io_error |= IOERR_VANISHED;
 774                                 rprintf(c, "file has vanished: %s\n",
 775                                         full_fname(thisname));
 776                         }
 777                 } else {
 778                         io_error |= IOERR_GENERAL;
 779                         rsyserr(FERROR, save_errno, "readlink %s failed",
 780                                 full_fname(thisname));
 781                 }
 782                 return NULL;
 783         }
 784
 785         /* backup.c calls us with filter_level set to NO_FILTERS. */
 786         if (filter_level == NO_FILTERS)
 787                 goto skip_filters;
 788
 789         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 790                 rprintf(FINFO, "skipping directory %s\n", thisname);
 791                 return NULL;
 792         }
 793
 794         /* We only care about directories because we need to avoid recursing
 795          * into a mount-point directory, not to avoid copying a symlinked
 796          * file if -L (or similar) was specified. */
 797         if (one_file_system && st.st_dev != filesystem_dev
 798          && S_ISDIR(st.st_mode)) {
 799                 if (one_file_system > 1) {
 800                         if (verbose > 2) {
 801                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 802                                         thisname);
 803                         }
 804                         return NULL;
 805                 }
 806                 flags |= FLAG_MOUNT_POINT;
 807         }
 808
 809         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 810                 return NULL;
 811
 812         if (lp_ignore_nonreadable(module_id)) {
 813 #ifdef SUPPORT_LINKS
 814                 if (!S_ISLNK(st.st_mode))
 815 #endif
 816                         if (access(thisname, R_OK) != 0)
 817                                 return NULL;
 818         }
 819
 820   skip_filters:
 821
 822         if (verbose > 2) {
 823                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 824                         who_am_i(), thisname, filter_level);
 825         }
 826
 827         if ((basename = strrchr(thisname, '/')) != NULL) {
 828                 dirname_len = ++basename - thisname; /* counts future '\0' */
 829                 if (lastdir_len == dirname_len - 1
 830                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 831                         dirname = lastdir;
 832                         dirname_len = 0; /* indicates no copy is needed */
 833                 } else
 834                         dirname = thisname;
 835         } else {
 836                 basename = thisname;
 837                 dirname = NULL;
 838                 dirname_len = 0;
 839         }
 840         basename_len = strlen(basename) + 1; /* count the '\0' */
 841
 842 #ifdef SUPPORT_LINKS
 843         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 844 #else
 845         linkname_len = 0;
 846 #endif
 847
 848         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 849                 ? MD4_SUM_LENGTH : 0;
 850
 851         alloc_len = file_struct_len + dirname_len + basename_len
 852             + linkname_len + sum_len;
 853         if (flist)
 854                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 855         else {
 856                 if (!(bp = new_array(char, alloc_len)))
 857                         out_of_memory("make_file");
 858         }
 859
 860         file = (struct file_struct *)bp;
 861         memset(bp, 0, file_struct_len);
 862         bp += file_struct_len;
 863
 864         file->flags = flags;
 865         file->modtime = st.st_mtime;
 866         file->length = st.st_size;
 867         file->mode = st.st_mode;
 868         file->uid = st.st_uid;
 869         file->gid = st.st_gid;
 870
 871 #ifdef SUPPORT_HARD_LINKS
 872         if (flist && flist->hlink_pool) {
 873                 if (protocol_version < 28) {
 874                         if (S_ISREG(st.st_mode))
 875                                 file->link_u.idev = pool_talloc(
 876                                     flist->hlink_pool, struct idev, 1,
 877                                     "inode_table");
 878                 } else {
 879                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 880                                 file->link_u.idev = pool_talloc(
 881                                     flist->hlink_pool, struct idev, 1,
 882                                     "inode_table");
 883                 }
 884         }
 885         if (file->link_u.idev) {
 886                 file->F_DEV = st.st_dev;
 887                 file->F_INODE = st.st_ino;
 888         }
 889 #endif
 890
 891         if (dirname_len) {
 892                 file->dirname = lastdir = bp;
 893                 lastdir_len = dirname_len - 1;
 894                 memcpy(bp, dirname, dirname_len - 1);
 895                 bp += dirname_len;
 896                 bp[-1] = '\0';
 897         } else if (dirname)
 898                 file->dirname = dirname;
 899
 900         file->basename = bp;
 901         memcpy(bp, basename, basename_len);
 902         bp += basename_len;
 903
 904 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 905         if ((preserve_devices && IS_DEVICE(st.st_mode))
 906          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 907                 file->u.rdev = st.st_rdev;
 908 #endif
 909
 910 #ifdef SUPPORT_LINKS
 911         if (linkname_len) {
 912                 file->u.link = bp;
 913                 memcpy(bp, linkname, linkname_len);
 914                 bp += linkname_len;
 915         }
 916 #endif
 917
 918         if (sum_len) {
 919                 file->u.sum = bp;
 920                 file_checksum(thisname, bp, st.st_size);
 921                 /*bp += sum_len;*/
 922         }
 923
 924         file->dir.root = flist_dir;
 925
 926         /* This code is only used by the receiver when it is building
 927          * a list of files for a delete pass. */
 928         if (keep_dirlinks && linkname_len && flist) {
 929                 STRUCT_STAT st2;
 930                 int save_mode = file->mode;
 931                 file->mode = S_IFDIR; /* Find a directory with our name. */
 932                 if (flist_find(the_file_list, file) >= 0
 933                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 934                         file->modtime = st2.st_mtime;
 935                         file->length = st2.st_size;
 936                         file->mode = st2.st_mode;
 937                         file->uid = st2.st_uid;
 938                         file->gid = st2.st_gid;
 939                         file->u.link = NULL;
 940                 } else
 941                         file->mode = save_mode;
 942         }
 943
 944         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 945                 stats.total_size += st.st_size;
 946
 947         return file;
 948 }
 949
 950 static struct file_struct *send_file_name(int f, struct file_list *flist,
 951                                           char *fname, STRUCT_STAT *stp,
 952                                           unsigned short flags)
 953 {
 954         struct file_struct *file;
 955
 956         file = make_file(fname, flist, stp, flags,
 957                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 958         if (!file)
 959                 return NULL;
 960
 961         if (chmod_modes && !S_ISLNK(file->mode))
 962                 file->mode = tweak_mode(file->mode, chmod_modes);
 963
 964         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 965
 966         flist_expand(flist);
 967
 968         if (file->basename[0]) {
 969                 flist->files[flist->count++] = file;
 970                 send_file_entry(file, f);
 971         }
 972         return file;
 973 }
 974
 975 static void send_if_directory(int f, struct file_list *flist,
 976                               struct file_struct *file,
 977                               char *fbuf, unsigned int ol)
 978 {
 979         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 980
 981         if (S_ISDIR(file->mode)
 982             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 983                 void *save_filters;
 984                 unsigned int len = strlen(fbuf);
 985                 if (len > 1 && fbuf[len-1] == '/')
 986                         fbuf[--len] = '\0';
 987                 if (len >= MAXPATHLEN - 1) {
 988                         io_error |= IOERR_GENERAL;
 989                         rprintf(FERROR, "skipping long-named directory: %s\n",
 990                                 full_fname(fbuf));
 991                         return;
 992                 }
 993                 save_filters = push_local_filters(fbuf, len);
 994                 send_directory(f, flist, fbuf, len);
 995                 pop_local_filters(save_filters);
 996                 fbuf[ol] = '\0';
 997                 if (is_dot_dir)
 998                         fbuf[ol-1] = '.';
 999         }
1000 }
1001
1002 /* This function is normally called by the sender, but the receiving side also
1003  * calls it from get_dirlist() with f set to -1 so that we just construct the
1004  * file list in memory without sending it over the wire.  Also, get_dirlist()
1005  * might call this with f set to -2, which also indicates that local filter
1006  * rules should be ignored. */
1007 static void send_directory(int f, struct file_list *flist,
1008                            char *fbuf, int len)
1009 {
1010         struct dirent *di;
1011         unsigned remainder;
1012         char *p;
1013         DIR *d;
1014         int start = flist->count;
1015
1016         if (!(d = opendir(fbuf))) {
1017                 io_error |= IOERR_GENERAL;
1018                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1019                 return;
1020         }
1021
1022         p = fbuf + len;
1023         if (len != 1 || *fbuf != '/')
1024                 *p++ = '/';
1025         *p = '\0';
1026         remainder = MAXPATHLEN - (p - fbuf);
1027
1028         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1029                 char *dname = d_name(di);
1030                 if (dname[0] == '.' && (dname[1] == '\0'
1031                     || (dname[1] == '.' && dname[2] == '\0')))
1032                         continue;
1033                 if (strlcpy(p, dname, remainder) >= remainder) {
1034                         io_error |= IOERR_GENERAL;
1035                         rprintf(FINFO,
1036                                 "cannot send long-named file %s\n",
1037                                 full_fname(fbuf));
1038                         continue;
1039                 }
1040
1041                 send_file_name(f, flist, fbuf, NULL, 0);
1042         }
1043
1044         fbuf[len] = '\0';
1045
1046         if (errno) {
1047                 io_error |= IOERR_GENERAL;
1048                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1049         }
1050
1051         closedir(d);
1052
1053         if (recurse) {
1054                 int i, end = flist->count - 1;
1055                 for (i = start; i <= end; i++)
1056                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1057         }
1058 }
1059
1060 struct file_list *send_file_list(int f, int argc, char *argv[])
1061 {
1062         int len;
1063         STRUCT_STAT st;
1064         char *p, *dir, olddir[sizeof curr_dir];
1065         char lastpath[MAXPATHLEN] = "";
1066         struct file_list *flist;
1067         struct timeval start_tv, end_tv;
1068         int64 start_write;
1069         int use_ff_fd = 0;
1070
1071         if (show_filelist_p())
1072                 start_filelist_progress("building file list");
1073
1074         start_write = stats.total_written;
1075         gettimeofday(&start_tv, NULL);
1076
1077         flist = flist_new(WITH_HLINK, "send_file_list");
1078
1079         io_start_buffering_out();
1080         if (filesfrom_fd >= 0) {
1081                 if (argv[0] && !push_dir(argv[0])) {
1082                         rsyserr(FERROR, errno, "push_dir %s failed",
1083                                 full_fname(argv[0]));
1084                         exit_cleanup(RERR_FILESELECT);
1085                 }
1086                 use_ff_fd = 1;
1087         }
1088
1089         while (1) {
1090                 char fbuf[MAXPATHLEN];
1091                 char *fn;
1092                 int is_dot_dir;
1093
1094                 if (use_ff_fd) {
1095                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1096                                 break;
1097                         sanitize_path(fbuf, fbuf, "", 0);
1098                 } else {
1099                         if (argc-- == 0)
1100                                 break;
1101                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1102                         if (sanitize_paths)
1103                                 sanitize_path(fbuf, fbuf, "", 0);
1104                 }
1105
1106                 len = strlen(fbuf);
1107                 if (relative_paths) {
1108                         /* We clean up fbuf below. */
1109                         is_dot_dir = 0;
1110                 } else if (!len || fbuf[len - 1] == '/') {
1111                         if (len == 2 && fbuf[0] == '.') {
1112                                 /* Turn "./" into just "." rather than "./." */
1113                                 fbuf[1] = '\0';
1114                         } else {
1115                                 if (len + 1 >= MAXPATHLEN)
1116                                         overflow_exit("send_file_list");
1117                                 fbuf[len++] = '.';
1118                                 fbuf[len] = '\0';
1119                         }
1120                         is_dot_dir = 1;
1121                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1122                     && (len == 2 || fbuf[len-3] == '/')) {
1123                         if (len + 2 >= MAXPATHLEN)
1124                                 overflow_exit("send_file_list");
1125                         fbuf[len++] = '/';
1126                         fbuf[len++] = '.';
1127                         fbuf[len] = '\0';
1128                         is_dot_dir = 1;
1129                 } else {
1130                         is_dot_dir = fbuf[len-1] == '.'
1131                                    && (len == 1 || fbuf[len-2] == '/');
1132                 }
1133
1134                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1135                         io_error |= IOERR_GENERAL;
1136                         rsyserr(FERROR, errno, "link_stat %s failed",
1137                                 full_fname(fbuf));
1138                         continue;
1139                 }
1140
1141                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1142                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1143                         continue;
1144                 }
1145
1146                 dir = NULL;
1147                 olddir[0] = '\0';
1148
1149                 if (!relative_paths) {
1150                         p = strrchr(fbuf, '/');
1151                         if (p) {
1152                                 *p = '\0';
1153                                 if (p == fbuf)
1154                                         dir = "/";
1155                                 else
1156                                         dir = fbuf;
1157                                 len -= p - fbuf + 1;
1158                                 fn = p + 1;
1159                         } else
1160                                 fn = fbuf;
1161                 } else {
1162                         if ((p = strstr(fbuf, "/./")) != NULL) {
1163                                 *p = '\0';
1164                                 if (p == fbuf)
1165                                         dir = "/";
1166                                 else
1167                                         dir = fbuf;
1168                                 len -= p - fbuf + 3;
1169                                 fn = p + 3;
1170                         } else
1171                                 fn = fbuf;
1172                         /* Get rid of trailing "/" and "/.". */
1173                         while (len) {
1174                                 if (fn[len - 1] == '/') {
1175                                         is_dot_dir = 1;
1176                                         if (!--len && !dir) {
1177                                                 len++;
1178                                                 break;
1179                                         }
1180                                 }
1181                                 else if (len >= 2 && fn[len - 1] == '.'
1182                                                   && fn[len - 2] == '/') {
1183                                         is_dot_dir = 1;
1184                                         if (!(len -= 2) && !dir) {
1185                                                 len++;
1186                                                 break;
1187                                         }
1188                                 } else
1189                                         break;
1190                         }
1191                         fn[len] = '\0';
1192                         /* Reject a ".." dir in the active part of the path. */
1193                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1194                                 if ((p[2] == '/' || p[2] == '\0')
1195                                  && (p == fn || p[-1] == '/')) {
1196                                         rprintf(FERROR,
1197                                             "found \"..\" dir in relative path: %s\n",
1198                                             fbuf);
1199                                         exit_cleanup(RERR_SYNTAX);
1200                                 }
1201                         }
1202                 }
1203
1204                 if (!*fn) {
1205                         len = 1;
1206                         fn = ".";
1207                 }
1208
1209                 if (dir && *dir) {
1210                         static char *lastdir;
1211                         static int lastdir_len;
1212
1213                         strlcpy(olddir, curr_dir, sizeof olddir);
1214
1215                         if (!push_dir(dir)) {
1216                                 io_error |= IOERR_GENERAL;
1217                                 rsyserr(FERROR, errno, "push_dir %s failed",
1218                                         full_fname(dir));
1219                                 continue;
1220                         }
1221
1222                         if (lastdir && strcmp(lastdir, dir) == 0) {
1223                                 flist_dir = lastdir;
1224                                 flist_dir_len = lastdir_len;
1225                         } else {
1226                                 flist_dir = lastdir = strdup(dir);
1227                                 flist_dir_len = lastdir_len = strlen(dir);
1228                         }
1229                 }
1230
1231                 if (fn != fbuf)
1232                         memmove(fbuf, fn, len + 1);
1233
1234                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1235                         /* Send the implied directories at the start of the
1236                          * source spec, so we get their permissions right. */
1237                         char *lp = lastpath, *slash = fbuf;
1238                         *p = '\0';
1239                         /* Skip any initial directories in our path that we
1240                          * have in common with lastpath. */
1241                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1242                                 if (*fn == '/')
1243                                         slash = fn;
1244                         }
1245                         *p = '/';
1246                         if (fn != p || (*lp && *lp != '/')) {
1247                                 int save_copy_links = copy_links;
1248                                 int save_xfer_dirs = xfer_dirs;
1249                                 copy_links |= copy_unsafe_links;
1250                                 xfer_dirs = 1;
1251                                 while ((slash = strchr(slash+1, '/')) != 0) {
1252                                         *slash = '\0';
1253                                         send_file_name(f, flist, fbuf, NULL, 0);
1254                                         *slash = '/';
1255                                 }
1256                                 copy_links = save_copy_links;
1257                                 xfer_dirs = save_xfer_dirs;
1258                                 *p = '\0';
1259                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1260                                 *p = '/';
1261                         }
1262                 }
1263
1264                 if (one_file_system)
1265                         filesystem_dev = st.st_dev;
1266
1267                 if (recurse || (xfer_dirs && is_dot_dir)) {
1268                         struct file_struct *file;
1269                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1270                         if (file)
1271                                 send_if_directory(f, flist, file, fbuf, len);
1272                 } else
1273                         send_file_name(f, flist, fbuf, &st, 0);
1274
1275                 if (olddir[0]) {
1276                         flist_dir = NULL;
1277                         flist_dir_len = 0;
1278                         if (!pop_dir(olddir)) {
1279                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1280                                         full_fname(olddir));
1281                                 exit_cleanup(RERR_FILESELECT);
1282                         }
1283                 }
1284         }
1285
1286         gettimeofday(&end_tv, NULL);
1287         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1288                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1289         if (stats.flist_buildtime == 0)
1290                 stats.flist_buildtime = 1;
1291         start_tv = end_tv;
1292
1293         send_file_entry(NULL, f);
1294
1295         if (show_filelist_p())
1296                 finish_filelist_progress(flist);
1297
1298         gettimeofday(&end_tv, NULL);
1299         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1300                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1301
1302         if (flist->hlink_pool) {
1303                 pool_destroy(flist->hlink_pool);
1304                 flist->hlink_pool = NULL;
1305         }
1306
1307         /* Sort the list without removing any duplicates.  This allows the
1308          * receiving side to ask for any name they like, which gives us the
1309          * flexibility to change the way we unduplicate names in the future
1310          * without causing a compatibility problem with older versions. */
1311         clean_flist(flist, 0, 0);
1312
1313         send_uid_list(f);
1314
1315         /* send the io_error flag */
1316         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1317
1318         io_end_buffering();
1319         stats.flist_size = stats.total_written - start_write;
1320         stats.num_files = flist->count;
1321
1322         if (verbose > 3)
1323                 output_flist(flist);
1324
1325         if (verbose > 2)
1326                 rprintf(FINFO, "send_file_list done\n");
1327
1328         return flist;
1329 }
1330
1331 struct file_list *recv_file_list(int f)
1332 {
1333         struct file_list *flist;
1334         unsigned short flags;
1335         int64 start_read;
1336
1337         if (show_filelist_p())
1338                 start_filelist_progress("receiving file list");
1339
1340         start_read = stats.total_read;
1341
1342         flist = flist_new(WITH_HLINK, "recv_file_list");
1343
1344         flist->count = 0;
1345         flist->malloced = 1000;
1346         flist->files = new_array(struct file_struct *, flist->malloced);
1347         if (!flist->files)
1348                 goto oom;
1349
1350         while ((flags = read_byte(f)) != 0) {
1351                 struct file_struct *file;
1352
1353                 flist_expand(flist);
1354
1355                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1356                         flags |= read_byte(f) << 8;
1357                 file = receive_file_entry(flist, flags, f);
1358
1359                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1360                         stats.total_size += file->length;
1361
1362                 flist->files[flist->count++] = file;
1363
1364                 maybe_emit_filelist_progress(flist->count);
1365
1366                 if (verbose > 2) {
1367                         rprintf(FINFO, "recv_file_name(%s)\n",
1368                                 f_name(file, NULL));
1369                 }
1370         }
1371         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1372
1373         if (verbose > 2)
1374                 rprintf(FINFO, "received %d names\n", flist->count);
1375
1376         if (show_filelist_p())
1377                 finish_filelist_progress(flist);
1378
1379         clean_flist(flist, relative_paths, 1);
1380
1381         if (f >= 0) {
1382                 recv_uid_list(f, flist);
1383
1384                 /* Recv the io_error flag */
1385                 if (lp_ignore_errors(module_id) || ignore_errors)
1386                         read_int(f);
1387                 else
1388                         io_error |= read_int(f);
1389         }
1390
1391         if (verbose > 3)
1392                 output_flist(flist);
1393
1394         if (list_only) {
1395                 int i;
1396                 for (i = 0; i < flist->count; i++)
1397                         list_file_entry(flist->files[i]);
1398         }
1399
1400         if (verbose > 2)
1401                 rprintf(FINFO, "recv_file_list done\n");
1402
1403         stats.flist_size = stats.total_read - start_read;
1404         stats.num_files = flist->count;
1405
1406         return flist;
1407
1408   oom:
1409         out_of_memory("recv_file_list");
1410         return NULL;            /* not reached */
1411 }
1412
1413 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1414 {
1415         return f_name_cmp(*file1, *file2);
1416 }
1417
1418 /* Search for an identically-named item in the file list.  Note that the
1419  * items must agree in their directory-ness, or no match is returned. */
1420 int flist_find(struct file_list *flist, struct file_struct *f)
1421 {
1422         int low = flist->low, high = flist->high;
1423         int diff, mid, mid_up;
1424
1425         while (low <= high) {
1426                 mid = (low + high) / 2;
1427                 if (flist->files[mid]->basename)
1428                         mid_up = mid;
1429                 else {
1430                         /* Scan for the next non-empty entry using the cached
1431                          * distance values.  If the value isn't fully up-to-
1432                          * date, update it. */
1433                         mid_up = mid + flist->files[mid]->dir.depth;
1434                         if (!flist->files[mid_up]->basename) {
1435                                 do {
1436                                     mid_up += flist->files[mid_up]->dir.depth;
1437                                 } while (!flist->files[mid_up]->basename);
1438                                 flist->files[mid]->dir.depth = mid_up - mid;
1439                         }
1440                         if (mid_up > high) {
1441                                 /* If there's nothing left above us, set high to
1442                                  * a non-empty entry below us and continue. */
1443                                 high = mid - flist->files[mid]->length;
1444                                 if (!flist->files[high]->basename) {
1445                                         do {
1446                                             high -= flist->files[high]->length;
1447                                         } while (!flist->files[high]->basename);
1448                                         flist->files[mid]->length = mid - high;
1449                                 }
1450                                 continue;
1451                         }
1452                 }
1453                 diff = f_name_cmp(flist->files[mid_up], f);
1454                 if (diff == 0) {
1455                         if (protocol_version < 29
1456                             && S_ISDIR(flist->files[mid_up]->mode)
1457                             != S_ISDIR(f->mode))
1458                                 return -1;
1459                         return mid_up;
1460                 }
1461                 if (diff < 0)
1462                         low = mid_up + 1;
1463                 else
1464                         high = mid - 1;
1465         }
1466         return -1;
1467 }
1468
1469 /*
1470  * Free up any resources a file_struct has allocated
1471  * and clear the file.
1472  */
1473 void clear_file(struct file_struct *file, struct file_list *flist)
1474 {
1475         if (flist->hlink_pool && file->link_u.idev)
1476                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1477         memset(file, 0, file_struct_len);
1478         /* In an empty entry, dir.depth is an offset to the next non-empty
1479          * entry.  Likewise for length in the opposite direction.  We assume
1480          * that we're alone for now since flist_find() will adjust the counts
1481          * it runs into that aren't up-to-date. */
1482         file->length = file->dir.depth = 1;
1483 }
1484
1485 /*
1486  * allocate a new file list
1487  */
1488 struct file_list *flist_new(int with_hlink, char *msg)
1489 {
1490         struct file_list *flist;
1491
1492         flist = new(struct file_list);
1493         if (!flist)
1494                 out_of_memory(msg);
1495
1496         memset(flist, 0, sizeof (struct file_list));
1497
1498         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1499             out_of_memory, POOL_INTERN)))
1500                 out_of_memory(msg);
1501
1502 #ifdef SUPPORT_HARD_LINKS
1503         if (with_hlink && preserve_hard_links) {
1504                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1505                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1506                         out_of_memory(msg);
1507         }
1508 #endif
1509
1510         return flist;
1511 }
1512
1513 /*
1514  * free up all elements in a flist
1515  */
1516 void flist_free(struct file_list *flist)
1517 {
1518         pool_destroy(flist->file_pool);
1519         pool_destroy(flist->hlink_pool);
1520         free(flist->files);
1521         free(flist);
1522 }
1523
1524 /*
1525  * This routine ensures we don't have any duplicate names in our file list.
1526  * duplicate names can cause corruption because of the pipelining
1527  */
1528 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1529 {
1530         char fbuf[MAXPATHLEN];
1531         int i, prev_i = 0;
1532
1533         if (!flist)
1534                 return;
1535         if (flist->count == 0) {
1536                 flist->high = -1;
1537                 return;
1538         }
1539
1540         qsort(flist->files, flist->count,
1541             sizeof flist->files[0], (int (*)())file_compare);
1542
1543         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1544                 if (flist->files[i]->basename) {
1545                         prev_i = i;
1546                         break;
1547                 }
1548         }
1549         flist->low = prev_i;
1550         while (++i < flist->count) {
1551                 int j;
1552                 struct file_struct *file = flist->files[i];
1553
1554                 if (!file->basename)
1555                         continue;
1556                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1557                         j = prev_i;
1558                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1559                         int save_mode = file->mode;
1560                         /* Make sure that this directory doesn't duplicate a
1561                          * non-directory earlier in the list. */
1562                         flist->high = prev_i;
1563                         file->mode = S_IFREG;
1564                         j = flist_find(flist, file);
1565                         file->mode = save_mode;
1566                 } else
1567                         j = -1;
1568                 if (j >= 0) {
1569                         struct file_struct *fp = flist->files[j];
1570                         int keep, drop;
1571                         /* If one is a dir and the other is not, we want to
1572                          * keep the dir because it might have contents in the
1573                          * list. */
1574                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1575                                 if (S_ISDIR(file->mode))
1576                                         keep = i, drop = j;
1577                                 else
1578                                         keep = j, drop = i;
1579                         } else
1580                                 keep = j, drop = i;
1581                         if (verbose > 1 && !am_server) {
1582                                 rprintf(FINFO,
1583                                         "removing duplicate name %s from file list (%d)\n",
1584                                         f_name(file, fbuf), drop);
1585                         }
1586                         /* Make sure we don't lose track of a user-specified
1587                          * top directory. */
1588                         flist->files[keep]->flags |= flist->files[drop]->flags
1589                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1590
1591                         clear_file(flist->files[drop], flist);
1592
1593                         if (keep == i) {
1594                                 if (flist->low == drop) {
1595                                         for (j = drop + 1;
1596                                              j < i && !flist->files[j]->basename;
1597                                              j++) {}
1598                                         flist->low = j;
1599                                 }
1600                                 prev_i = i;
1601                         }
1602                 } else
1603                         prev_i = i;
1604         }
1605         flist->high = no_dups ? prev_i : flist->count - 1;
1606
1607         if (strip_root) {
1608                 /* We need to strip off the leading slashes for relative
1609                  * paths, but this must be done _after_ the sorting phase. */
1610                 for (i = flist->low; i <= flist->high; i++) {
1611                         struct file_struct *file = flist->files[i];
1612
1613                         if (!file->dirname)
1614                                 continue;
1615                         while (*file->dirname == '/')
1616                                 file->dirname++;
1617                         if (!*file->dirname)
1618                                 file->dirname = NULL;
1619                 }
1620         }
1621
1622         if (prune_empty_dirs && no_dups) {
1623                 int j, prev_depth = 0;
1624
1625                 prev_i = 0; /* It's OK that this isn't really true. */
1626
1627                 for (i = flist->low; i <= flist->high; i++) {
1628                         struct file_struct *fp, *file = flist->files[i];
1629
1630                         /* This temporarily abuses the dir.depth value for a
1631                          * directory that is in a chain that might get pruned.
1632                          * We restore the old value if it gets a reprieve. */
1633                         if (S_ISDIR(file->mode) && file->dir.depth) {
1634                                 /* Dump empty dirs when coming back down. */
1635                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1636                                         fp = flist->files[prev_i];
1637                                         if (fp->dir.depth >= 0)
1638                                                 break;
1639                                         prev_i = -fp->dir.depth-1;
1640                                         clear_file(fp, flist);
1641                                 }
1642                                 prev_depth = file->dir.depth;
1643                                 if (is_excluded(f_name(file, fbuf), 1,
1644                                                        ALL_FILTERS)) {
1645                                         /* Keep dirs through this dir. */
1646                                         for (j = prev_depth-1; ; j--) {
1647                                                 fp = flist->files[prev_i];
1648                                                 if (fp->dir.depth >= 0)
1649                                                         break;
1650                                                 prev_i = -fp->dir.depth-1;
1651                                                 fp->dir.depth = j;
1652                                         }
1653                                 } else
1654                                         file->dir.depth = -prev_i-1;
1655                                 prev_i = i;
1656                         } else {
1657                                 /* Keep dirs through this non-dir. */
1658                                 for (j = prev_depth; ; j--) {
1659                                         fp = flist->files[prev_i];
1660                                         if (fp->dir.depth >= 0)
1661                                                 break;
1662                                         prev_i = -fp->dir.depth-1;
1663                                         fp->dir.depth = j;
1664                                 }
1665                         }
1666                 }
1667                 /* Dump empty all remaining empty dirs. */
1668                 while (1) {
1669                         struct file_struct *fp = flist->files[prev_i];
1670                         if (fp->dir.depth >= 0)
1671                                 break;
1672                         prev_i = -fp->dir.depth-1;
1673                         clear_file(fp, flist);
1674                 }
1675
1676                 for (i = flist->low; i <= flist->high; i++) {
1677                         if (flist->files[i]->basename)
1678                                 break;
1679                 }
1680                 flist->low = i;
1681                 for (i = flist->high; i >= flist->low; i--) {
1682                         if (flist->files[i]->basename)
1683                                 break;
1684                 }
1685                 flist->high = i;
1686         }
1687 }
1688
1689 static void output_flist(struct file_list *flist)
1690 {
1691         char uidbuf[16], gidbuf[16], depthbuf[16];
1692         struct file_struct *file;
1693         const char *who = who_am_i();
1694         int i;
1695
1696         for (i = 0; i < flist->count; i++) {
1697                 file = flist->files[i];
1698                 if ((am_root || am_sender) && preserve_uid)
1699                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1700                 else
1701                         *uidbuf = '\0';
1702                 if (preserve_gid && file->gid != GID_NONE)
1703                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1704                 else
1705                         *gidbuf = '\0';
1706                 if (!am_sender)
1707                         sprintf(depthbuf, "%d", file->dir.depth);
1708                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1709                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1710                         file->dirname ? file->dirname : "",
1711                         file->dirname ? "/" : "", NS(file->basename),
1712                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1713                         (double)file->length, uidbuf, gidbuf, file->flags);
1714         }
1715 }
1716
1717 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1718 enum fnc_type { t_PATH, t_ITEM };
1719
1720 /* Compare the names of two file_struct entities, similar to how strcmp()
1721  * would do if it were operating on the joined strings.
1722  *
1723  * Some differences beginning with protocol_version 29: (1) directory names
1724  * are compared with an assumed trailing slash so that they compare in a
1725  * way that would cause them to sort immediately prior to any content they
1726  * may have; (2) a directory of any name compares after a non-directory of
1727  * any name at the same depth; (3) a directory with name "." compares prior
1728  * to anything else.  These changes mean that a directory and a non-dir
1729  * with the same name will not compare as equal (protocol_version >= 29).
1730  *
1731  * The dirname component can be an empty string, but the basename component
1732  * cannot (and never is in the current codebase).  The basename component
1733  * may be NULL (for a removed item), in which case it is considered to be
1734  * after any existing item. */
1735 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1736 {
1737         int dif;
1738         const uchar *c1, *c2;
1739         enum fnc_state state1, state2;
1740         enum fnc_type type1, type2;
1741         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1742
1743         if (!f1 || !f1->basename) {
1744                 if (!f2 || !f2->basename)
1745                         return 0;
1746                 return -1;
1747         }
1748         if (!f2 || !f2->basename)
1749                 return 1;
1750
1751         c1 = (uchar*)f1->dirname;
1752         c2 = (uchar*)f2->dirname;
1753         if (c1 == c2)
1754                 c1 = c2 = NULL;
1755         if (!c1) {
1756                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1757                 c1 = (uchar*)f1->basename;
1758                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1759                         type1 = t_ITEM;
1760                         state1 = s_TRAILING;
1761                         c1 = (uchar*)"";
1762                 } else
1763                         state1 = s_BASE;
1764         } else if (!*c1) {
1765                 type1 = t_path;
1766                 state1 = s_SLASH;
1767                 c1 = (uchar*)"/";
1768         } else {
1769                 type1 = t_path;
1770                 state1 = s_DIR;
1771         }
1772         if (!c2) {
1773                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1774                 c2 = (uchar*)f2->basename;
1775                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1776                         type2 = t_ITEM;
1777                         state2 = s_TRAILING;
1778                         c2 = (uchar*)"";
1779                 } else
1780                         state2 = s_BASE;
1781         } else if (!*c2) {
1782                 type2 = t_path;
1783                 state2 = s_SLASH;
1784                 c2 = (uchar*)"/";
1785         } else {
1786                 type2 = t_path;
1787                 state2 = s_DIR;
1788         }
1789
1790         if (type1 != type2)
1791                 return type1 == t_PATH ? 1 : -1;
1792
1793         while (1) {
1794                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1795                         break;
1796                 if (!*c1) {
1797                         switch (state1) {
1798                         case s_DIR:
1799                                 state1 = s_SLASH;
1800                                 c1 = (uchar*)"/";
1801                                 break;
1802                         case s_SLASH:
1803                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1804                                 c1 = (uchar*)f1->basename;
1805                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1806                                         type1 = t_ITEM;
1807                                         state1 = s_TRAILING;
1808                                         c1 = (uchar*)"";
1809                                 } else
1810                                         state1 = s_BASE;
1811                                 break;
1812                         case s_BASE:
1813                                 state1 = s_TRAILING;
1814                                 if (type1 == t_PATH) {
1815                                         c1 = (uchar*)"/";
1816                                         break;
1817                                 }
1818                                 /* FALL THROUGH */
1819                         case s_TRAILING:
1820                                 type1 = t_ITEM;
1821                                 break;
1822                         }
1823                         if (*c2 && type1 != type2)
1824                                 return type1 == t_PATH ? 1 : -1;
1825                 }
1826                 if (!*c2) {
1827                         switch (state2) {
1828                         case s_DIR:
1829                                 state2 = s_SLASH;
1830                                 c2 = (uchar*)"/";
1831                                 break;
1832                         case s_SLASH:
1833                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1834                                 c2 = (uchar*)f2->basename;
1835                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1836                                         type2 = t_ITEM;
1837                                         state2 = s_TRAILING;
1838                                         c2 = (uchar*)"";
1839                                 } else
1840                                         state2 = s_BASE;
1841                                 break;
1842                         case s_BASE:
1843                                 state2 = s_TRAILING;
1844                                 if (type2 == t_PATH) {
1845                                         c2 = (uchar*)"/";
1846                                         break;
1847                                 }
1848                                 /* FALL THROUGH */
1849                         case s_TRAILING:
1850                                 if (!*c1)
1851                                         return 0;
1852                                 type2 = t_ITEM;
1853                                 break;
1854                         }
1855                         if (type1 != type2)
1856                                 return type1 == t_PATH ? 1 : -1;
1857                 }
1858         }
1859
1860         return dif;
1861 }
1862
1863 /* Return a copy of the full filename of a flist entry, using the indicated
1864  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1865  * done because we checked the size when creating the file_struct entry.
1866  */
1867 char *f_name(struct file_struct *f, char *fbuf)
1868 {
1869         if (!f || !f->basename)
1870                 return NULL;
1871
1872         if (!fbuf) {
1873                 static char names[5][MAXPATHLEN];
1874                 static unsigned int n;
1875
1876                 n = (n + 1) % (sizeof names / sizeof names[0]);
1877
1878                 fbuf = names[n];
1879         }
1880
1881         if (f->dirname) {
1882                 int len = strlen(f->dirname);
1883                 memcpy(fbuf, f->dirname, len);
1884                 fbuf[len] = '/';
1885                 strcpy(fbuf + len + 1, f->basename);
1886         } else
1887                 strcpy(fbuf, f->basename);
1888
1889         return fbuf;
1890 }
1891
1892 /* Do a non-recursive scan of the named directory, possibly ignoring all
1893  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1894  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1895  * buffer (the functions we call will append names onto the end, but the old
1896  * dir value will be restored on exit). */
1897 struct file_list *get_dirlist(char *dirname, int dlen,
1898                               int ignore_filter_rules)
1899 {
1900         struct file_list *dirlist;
1901         char dirbuf[MAXPATHLEN];
1902         int save_recurse = recurse;
1903         int save_xfer_dirs = xfer_dirs;
1904
1905         if (dlen < 0) {
1906                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1907                 if (dlen >= MAXPATHLEN)
1908                         return NULL;
1909                 dirname = dirbuf;
1910         }
1911
1912         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1913
1914         recurse = 0;
1915         xfer_dirs = 1;
1916         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1917         xfer_dirs = save_xfer_dirs;
1918         recurse = save_recurse;
1919         if (do_progress)
1920                 flist_count_offset += dirlist->count;
1921
1922         clean_flist(dirlist, 0, 0);
1923
1924         if (verbose > 3)
1925                 output_flist(dirlist);
1926
1927         return dirlist;
1928 }