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 curr_dir_depth;
  41 extern int one_file_system;
  42 extern int copy_dirlinks;
  43 extern int keep_dirlinks;
  44 extern int preserve_links;
  45 extern int preserve_hard_links;
  46 extern int preserve_devices;
  47 extern int preserve_specials;
  48 extern int preserve_uid;
  49 extern int preserve_gid;
  50 extern int relative_paths;
  51 extern int implied_dirs;
  52 extern int prune_empty_dirs;
  53 extern int copy_links;
  54 extern int copy_unsafe_links;
  55 extern int protocol_version;
  56 extern int sanitize_paths;
  57 extern struct stats stats;
  58 extern struct file_list *the_file_list;
  59
  60 extern char curr_dir[MAXPATHLEN];
  61
  62 extern struct chmod_mode_struct *chmod_modes;
  63
  64 extern struct filter_list_struct filter_list;
  65 extern struct filter_list_struct server_filter_list;
  66
  67 int io_error;
  68 int checksum_len;
  69 dev_t filesystem_dev; /* used to implement -x */
  70 unsigned int file_struct_len;
  71
  72 static char empty_sum[MD4_SUM_LENGTH];
  73 static int flist_count_offset;
  74
  75 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  76 static void output_flist(struct file_list *flist);
  77
  78 void init_flist(void)
  79 {
  80         struct file_struct f;
  81
  82         /* Figure out how big the file_struct is without trailing padding */
  83         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  84         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
  85 }
  86
  87 static int show_filelist_p(void)
  88 {
  89         return verbose && xfer_dirs && !am_server;
  90 }
  91
  92 static void start_filelist_progress(char *kind)
  93 {
  94         rprintf(FINFO, "%s ... ", kind);
  95         if (verbose > 1 || do_progress)
  96                 rprintf(FINFO, "\n");
  97         rflush(FINFO);
  98 }
  99
 100 static void emit_filelist_progress(int count)
 101 {
 102         rprintf(FINFO, " %d files...\r", count);
 103 }
 104
 105 static void maybe_emit_filelist_progress(int count)
 106 {
 107         if (do_progress && show_filelist_p() && (count % 100) == 0)
 108                 emit_filelist_progress(count);
 109 }
 110
 111 static void finish_filelist_progress(const struct file_list *flist)
 112 {
 113         if (do_progress) {
 114                 /* This overwrites the progress line */
 115                 rprintf(FINFO, "%d file%sto consider\n",
 116                         flist->count, flist->count == 1 ? " " : "s ");
 117         } else
 118                 rprintf(FINFO, "done\n");
 119 }
 120
 121 void show_flist_stats(void)
 122 {
 123         /* Nothing yet */
 124 }
 125
 126 static void list_file_entry(struct file_struct *f)
 127 {
 128         char permbuf[PERMSTRING_SIZE];
 129
 130         if (!f->basename) {
 131                 /* this can happen if duplicate names were removed */
 132                 return;
 133         }
 134
 135         permstring(permbuf, f->mode);
 136
 137 #ifdef SUPPORT_LINKS
 138         if (preserve_links && S_ISLNK(f->mode)) {
 139                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 140                         permbuf,
 141                         (double)f->length, timestring(f->modtime),
 142                         f_name(f, NULL), f->u.link);
 143         } else
 144 #endif
 145         {
 146                 rprintf(FINFO, "%s %11.0f %s %s\n",
 147                         permbuf,
 148                         (double)f->length, timestring(f->modtime),
 149                         f_name(f, NULL));
 150         }
 151 }
 152
 153 /* Stat either a symlink or its referent, depending on the settings of
 154  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 155  *
 156  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 157  * MAXPATHLEN chars) will be set to the symlink's target string.
 158  *
 159  * The stat structure pointed to by stp will contain information about the
 160  * link or the referent as appropriate, if they exist. */
 161 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 162 {
 163 #ifdef SUPPORT_LINKS
 164         if (link_stat(path, stp, copy_dirlinks) < 0)
 165                 return -1;
 166         if (S_ISLNK(stp->st_mode)) {
 167                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 168                 if (llen < 0)
 169                         return -1;
 170                 linkbuf[llen] = '\0';
 171                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 172                         if (verbose > 1) {
 173                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 174                                         path, linkbuf);
 175                         }
 176                         return safe_stat(path, stp);
 177                 }
 178         }
 179         return 0;
 180 #else
 181         return do_stat(path, stp);
 182 #endif
 183 }
 184
 185 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 186 {
 187 #ifdef SUPPORT_LINKS
 188         if (copy_links)
 189                 return safe_stat(path, stp);
 190         if (do_lstat(path, stp) < 0)
 191                 return -1;
 192         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 193                 STRUCT_STAT st;
 194                 if (safe_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 195                         *stp = st;
 196         }
 197         return 0;
 198 #else
 199         return do_stat(path, stp);
 200 #endif
 201 }
 202
 203 /* This function is used to check if a file should be included/excluded
 204  * from the list of files based on its name and type etc.  The value of
 205  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 206 static int is_excluded(char *fname, int is_dir, int filter_level)
 207 {
 208 #if 0 /* This currently never happens, so avoid a useless compare. */
 209         if (filter_level == NO_FILTERS)
 210                 return 0;
 211 #endif
 212         if (fname) {
 213                 /* never exclude '.', even if somebody does --exclude '*' */
 214                 if (fname[0] == '.' && !fname[1])
 215                         return 0;
 216                 /* Handle the -R version of the '.' dir. */
 217                 if (fname[0] == '/') {
 218                         int len = strlen(fname);
 219                         if (fname[len-1] == '.' && fname[len-2] == '/')
 220                                 return 0;
 221                 }
 222         }
 223         if (server_filter_list.head
 224             && check_filter(&server_filter_list, fname, is_dir) < 0)
 225                 return 1;
 226         if (filter_level != ALL_FILTERS)
 227                 return 0;
 228         if (filter_list.head
 229             && check_filter(&filter_list, fname, is_dir) < 0)
 230                 return 1;
 231         return 0;
 232 }
 233
 234 static int to_wire_mode(mode_t mode)
 235 {
 236 #ifdef SUPPORT_LINKS
 237         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 238                 return (mode & ~(_S_IFMT)) | 0120000;
 239 #endif
 240         return (int)mode;
 241 }
 242
 243 static mode_t from_wire_mode(int mode)
 244 {
 245         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 246                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 247         return (mode_t)mode;
 248 }
 249
 250 static void send_directory(int f, struct file_list *flist,
 251                            char *fbuf, int len);
 252
 253 static char *flist_dir;
 254 static int flist_dir_len;
 255
 256
 257 /**
 258  * Make sure @p flist is big enough to hold at least @p flist->count
 259  * entries.
 260  **/
 261 void flist_expand(struct file_list *flist)
 262 {
 263         struct file_struct **new_ptr;
 264
 265         if (flist->count < flist->malloced)
 266                 return;
 267
 268         if (flist->malloced < FLIST_START)
 269                 flist->malloced = FLIST_START;
 270         else if (flist->malloced >= FLIST_LINEAR)
 271                 flist->malloced += FLIST_LINEAR;
 272         else
 273                 flist->malloced *= 2;
 274
 275         /*
 276          * In case count jumped or we are starting the list
 277          * with a known size just set it.
 278          */
 279         if (flist->malloced < flist->count)
 280                 flist->malloced = flist->count;
 281
 282         new_ptr = realloc_array(flist->files, struct file_struct *,
 283                                 flist->malloced);
 284
 285         if (verbose >= 2 && flist->malloced != FLIST_START) {
 286                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 287                     who_am_i(),
 288                     (double)sizeof flist->files[0] * flist->malloced,
 289                     (new_ptr == flist->files) ? " not" : "");
 290         }
 291
 292         flist->files = new_ptr;
 293
 294         if (!flist->files)
 295                 out_of_memory("flist_expand");
 296 }
 297
 298 static void send_file_entry(struct file_struct *file, int f)
 299 {
 300         unsigned short flags;
 301         static time_t modtime;
 302         static mode_t mode;
 303         static int64 dev;
 304         static dev_t rdev;
 305         static uint32 rdev_major;
 306         static uid_t uid;
 307         static gid_t gid;
 308         static char lastname[MAXPATHLEN];
 309         char fname[MAXPATHLEN];
 310         int l1, l2;
 311
 312         if (f < 0)
 313                 return;
 314
 315         if (!file) {
 316                 write_byte(f, 0);
 317                 modtime = 0, mode = 0;
 318                 dev = 0, rdev = makedev(0, 0);
 319                 rdev_major = 0;
 320                 uid = 0, gid = 0;
 321                 *lastname = '\0';
 322                 return;
 323         }
 324
 325         f_name(file, fname);
 326
 327         flags = file->flags & XMIT_TOP_DIR;
 328
 329         if (file->mode == mode)
 330                 flags |= XMIT_SAME_MODE;
 331         else
 332                 mode = file->mode;
 333         if ((preserve_devices && IS_DEVICE(mode))
 334          || (preserve_specials && IS_SPECIAL(mode))) {
 335                 if (protocol_version < 28) {
 336                         if (file->u.rdev == rdev)
 337                                 flags |= XMIT_SAME_RDEV_pre28;
 338                         else
 339                                 rdev = file->u.rdev;
 340                 } else {
 341                         rdev = file->u.rdev;
 342                         if ((uint32)major(rdev) == rdev_major)
 343                                 flags |= XMIT_SAME_RDEV_MAJOR;
 344                         else
 345                                 rdev_major = major(rdev);
 346                         if ((uint32)minor(rdev) <= 0xFFu)
 347                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 348                 }
 349         } else if (protocol_version < 28)
 350                 rdev = makedev(0, 0);
 351         if (file->uid == uid)
 352                 flags |= XMIT_SAME_UID;
 353         else
 354                 uid = file->uid;
 355         if (file->gid == gid)
 356                 flags |= XMIT_SAME_GID;
 357         else
 358                 gid = file->gid;
 359         if (file->modtime == modtime)
 360                 flags |= XMIT_SAME_TIME;
 361         else
 362                 modtime = file->modtime;
 363
 364 #ifdef SUPPORT_HARD_LINKS
 365         if (file->link_u.idev) {
 366                 if (file->F_DEV == dev) {
 367                         if (protocol_version >= 28)
 368                                 flags |= XMIT_SAME_DEV;
 369                 } else
 370                         dev = file->F_DEV;
 371                 flags |= XMIT_HAS_IDEV_DATA;
 372         }
 373 #endif
 374
 375         for (l1 = 0;
 376             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 377             l1++) {}
 378         l2 = strlen(fname+l1);
 379
 380         if (l1 > 0)
 381                 flags |= XMIT_SAME_NAME;
 382         if (l2 > 255)
 383                 flags |= XMIT_LONG_NAME;
 384
 385         /* We must make sure we don't send a zero flag byte or the
 386          * other end will terminate the flist transfer.  Note that
 387          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 388          * it's harmless way to add a bit to the first flag byte. */
 389         if (protocol_version >= 28) {
 390                 if (!flags && !S_ISDIR(mode))
 391                         flags |= XMIT_TOP_DIR;
 392                 if ((flags & 0xFF00) || !flags) {
 393                         flags |= XMIT_EXTENDED_FLAGS;
 394                         write_byte(f, flags);
 395                         write_byte(f, flags >> 8);
 396                 } else
 397                         write_byte(f, flags);
 398         } else {
 399                 if (!(flags & 0xFF))
 400                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 401                 write_byte(f, flags);
 402         }
 403         if (flags & XMIT_SAME_NAME)
 404                 write_byte(f, l1);
 405         if (flags & XMIT_LONG_NAME)
 406                 write_int(f, l2);
 407         else
 408                 write_byte(f, l2);
 409         write_buf(f, fname + l1, l2);
 410
 411         write_longint(f, file->length);
 412         if (!(flags & XMIT_SAME_TIME))
 413                 write_int(f, modtime);
 414         if (!(flags & XMIT_SAME_MODE))
 415                 write_int(f, to_wire_mode(mode));
 416         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 417                 if (!numeric_ids)
 418                         add_uid(uid);
 419                 write_int(f, uid);
 420         }
 421         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 422                 if (!numeric_ids)
 423                         add_gid(gid);
 424                 write_int(f, gid);
 425         }
 426         if ((preserve_devices && IS_DEVICE(mode))
 427          || (preserve_specials && IS_SPECIAL(mode))) {
 428                 if (protocol_version < 28) {
 429                         if (!(flags & XMIT_SAME_RDEV_pre28))
 430                                 write_int(f, (int)rdev);
 431                 } else {
 432                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 433                                 write_int(f, major(rdev));
 434                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 435                                 write_byte(f, minor(rdev));
 436                         else
 437                                 write_int(f, minor(rdev));
 438                 }
 439         }
 440
 441 #ifdef SUPPORT_LINKS
 442         if (preserve_links && S_ISLNK(mode)) {
 443                 int len = strlen(file->u.link);
 444                 write_int(f, len);
 445                 write_buf(f, file->u.link, len);
 446         }
 447 #endif
 448
 449 #ifdef SUPPORT_HARD_LINKS
 450         if (flags & XMIT_HAS_IDEV_DATA) {
 451                 if (protocol_version < 26) {
 452                         /* 32-bit dev_t and ino_t */
 453                         write_int(f, dev);
 454                         write_int(f, file->F_INODE);
 455                 } else {
 456                         /* 64-bit dev_t and ino_t */
 457                         if (!(flags & XMIT_SAME_DEV))
 458                                 write_longint(f, dev);
 459                         write_longint(f, file->F_INODE);
 460                 }
 461         }
 462 #endif
 463
 464         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 465                 char *sum;
 466                 if (S_ISREG(mode))
 467                         sum = file->u.sum;
 468                 else {
 469                         /* Prior to 28, we sent a useless set of nulls. */
 470                         sum = empty_sum;
 471                 }
 472                 write_buf(f, sum, checksum_len);
 473         }
 474
 475         strlcpy(lastname, fname, MAXPATHLEN);
 476 }
 477
 478 static struct file_struct *receive_file_entry(struct file_list *flist,
 479                                               unsigned short flags, int f)
 480 {
 481         static time_t modtime;
 482         static mode_t mode;
 483         static int64 dev;
 484         static dev_t rdev;
 485         static uint32 rdev_major;
 486         static uid_t uid;
 487         static gid_t gid;
 488         static char lastname[MAXPATHLEN], *lastdir;
 489         static int lastdir_depth, lastdir_len = -1;
 490         static unsigned int del_hier_name_len = 0;
 491         static int in_del_hier = 0;
 492         char thisname[MAXPATHLEN];
 493         unsigned int l1 = 0, l2 = 0;
 494         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 495         OFF_T file_length;
 496         char *basename, *dirname, *bp;
 497         struct file_struct *file;
 498
 499         if (!flist) {
 500                 modtime = 0, mode = 0;
 501                 dev = 0, rdev = makedev(0, 0);
 502                 rdev_major = 0;
 503                 uid = 0, gid = 0;
 504                 *lastname = '\0';
 505                 lastdir_len = -1;
 506                 in_del_hier = 0;
 507                 return NULL;
 508         }
 509
 510         if (flags & XMIT_SAME_NAME)
 511                 l1 = read_byte(f);
 512
 513         if (flags & XMIT_LONG_NAME)
 514                 l2 = read_int(f);
 515         else
 516                 l2 = read_byte(f);
 517
 518         if (l2 >= MAXPATHLEN - l1) {
 519                 rprintf(FERROR,
 520                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 521                         flags, l1, l2, lastname);
 522                 overflow_exit("receive_file_entry");
 523         }
 524
 525         strlcpy(thisname, lastname, l1 + 1);
 526         read_sbuf(f, &thisname[l1], l2);
 527         thisname[l1 + l2] = 0;
 528
 529         strlcpy(lastname, thisname, MAXPATHLEN);
 530
 531         clean_fname(thisname, 0);
 532
 533         if (sanitize_paths)
 534                 sanitize_path(thisname, thisname, "", 0, NULL);
 535
 536         if ((basename = strrchr(thisname, '/')) != NULL) {
 537                 dirname_len = ++basename - thisname; /* counts future '\0' */
 538                 if (lastdir_len == dirname_len - 1
 539                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 540                         dirname = lastdir;
 541                         dirname_len = 0; /* indicates no copy is needed */
 542                 } else
 543                         dirname = thisname;
 544         } else {
 545                 basename = thisname;
 546                 dirname = NULL;
 547                 dirname_len = 0;
 548         }
 549         basename_len = strlen(basename) + 1; /* count the '\0' */
 550
 551         file_length = read_longint(f);
 552         if (!(flags & XMIT_SAME_TIME))
 553                 modtime = (time_t)read_int(f);
 554         if (!(flags & XMIT_SAME_MODE))
 555                 mode = from_wire_mode(read_int(f));
 556
 557         if (chmod_modes && !S_ISLNK(mode))
 558                 mode = tweak_mode(mode, chmod_modes);
 559
 560         if (preserve_uid && !(flags & XMIT_SAME_UID))
 561                 uid = (uid_t)read_int(f);
 562         if (preserve_gid && !(flags & XMIT_SAME_GID))
 563                 gid = (gid_t)read_int(f);
 564
 565         if ((preserve_devices && IS_DEVICE(mode))
 566          || (preserve_specials && IS_SPECIAL(mode))) {
 567                 if (protocol_version < 28) {
 568                         if (!(flags & XMIT_SAME_RDEV_pre28))
 569                                 rdev = (dev_t)read_int(f);
 570                 } else {
 571                         uint32 rdev_minor;
 572                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 573                                 rdev_major = read_int(f);
 574                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 575                                 rdev_minor = read_byte(f);
 576                         else
 577                                 rdev_minor = read_int(f);
 578                         rdev = makedev(rdev_major, rdev_minor);
 579                 }
 580         } else if (protocol_version < 28)
 581                 rdev = makedev(0, 0);
 582
 583 #ifdef SUPPORT_LINKS
 584         if (preserve_links && S_ISLNK(mode)) {
 585                 linkname_len = read_int(f) + 1; /* count the '\0' */
 586                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 587                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 588                                 linkname_len - 1);
 589                         overflow_exit("receive_file_entry");
 590                 }
 591         }
 592         else
 593 #endif
 594                 linkname_len = 0;
 595
 596         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 597
 598         alloc_len = file_struct_len + dirname_len + basename_len
 599                   + linkname_len + sum_len;
 600         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 601
 602         file = (struct file_struct *)bp;
 603         memset(bp, 0, file_struct_len);
 604         bp += file_struct_len;
 605
 606         file->modtime = modtime;
 607         file->length = file_length;
 608         file->mode = mode;
 609         file->uid = uid;
 610         file->gid = gid;
 611
 612         if (dirname_len) {
 613                 file->dirname = lastdir = bp;
 614                 lastdir_len = dirname_len - 1;
 615                 memcpy(bp, dirname, dirname_len - 1);
 616                 bp += dirname_len;
 617                 bp[-1] = '\0';
 618                 lastdir_depth = count_dir_elements(lastdir);
 619                 file->dir.depth = lastdir_depth + 1;
 620         } else if (dirname) {
 621                 file->dirname = dirname; /* we're reusing lastname */
 622                 file->dir.depth = lastdir_depth + 1;
 623         } else
 624                 file->dir.depth = 1;
 625
 626         if (S_ISDIR(mode)) {
 627                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 628                         file->dir.depth--;
 629                 if (flags & XMIT_TOP_DIR) {
 630                         in_del_hier = recurse;
 631                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 632                         if (relative_paths && del_hier_name_len > 2
 633                             && lastname[del_hier_name_len-1] == '.'
 634                             && lastname[del_hier_name_len-2] == '/')
 635                                 del_hier_name_len -= 2;
 636                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 637                 } else if (in_del_hier) {
 638                         if (!relative_paths || !del_hier_name_len
 639                          || (l1 >= del_hier_name_len
 640                           && lastname[del_hier_name_len] == '/'))
 641                                 file->flags |= FLAG_DEL_HERE;
 642                         else
 643                                 in_del_hier = 0;
 644                 }
 645         }
 646
 647         file->basename = bp;
 648         memcpy(bp, basename, basename_len);
 649         bp += basename_len;
 650
 651         if ((preserve_devices && IS_DEVICE(mode))
 652          || (preserve_specials && IS_SPECIAL(mode)))
 653                 file->u.rdev = rdev;
 654
 655 #ifdef SUPPORT_LINKS
 656         if (linkname_len) {
 657                 file->u.link = bp;
 658                 read_sbuf(f, bp, linkname_len - 1);
 659                 bp += linkname_len;
 660         }
 661 #endif
 662
 663 #ifdef SUPPORT_HARD_LINKS
 664         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 665                 flags |= XMIT_HAS_IDEV_DATA;
 666         if (flags & XMIT_HAS_IDEV_DATA) {
 667                 int64 inode;
 668                 if (protocol_version < 26) {
 669                         dev = read_int(f);
 670                         inode = read_int(f);
 671                 } else {
 672                         if (!(flags & XMIT_SAME_DEV))
 673                                 dev = read_longint(f);
 674                         inode = read_longint(f);
 675                 }
 676                 if (flist->hlink_pool) {
 677                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 678                             struct idev, 1, "inode_table");
 679                         file->F_INODE = inode;
 680                         file->F_DEV = dev;
 681                 }
 682         }
 683 #endif
 684
 685         if (always_checksum && (sum_len || protocol_version < 28)) {
 686                 char *sum;
 687                 if (sum_len) {
 688                         file->u.sum = sum = bp;
 689                         /*bp += sum_len;*/
 690                 } else {
 691                         /* Prior to 28, we get a useless set of nulls. */
 692                         sum = empty_sum;
 693                 }
 694                 read_buf(f, sum, checksum_len);
 695         }
 696
 697         return file;
 698 }
 699
 700 /**
 701  * Create a file_struct for a named file by reading its stat()
 702  * information and performing extensive checks against global
 703  * options.
 704  *
 705  * @return the new file, or NULL if there was an error or this file
 706  * should be excluded.
 707  *
 708  * @todo There is a small optimization opportunity here to avoid
 709  * stat()ing the file in some circumstances, which has a certain cost.
 710  * We are called immediately after doing readdir(), and so we may
 711  * already know the d_type of the file.  We could for example avoid
 712  * statting directories if we're not recursing, but this is not a very
 713  * important case.  Some systems may not have d_type.
 714  **/
 715 struct file_struct *make_file(char *fname, struct file_list *flist,
 716                               STRUCT_STAT *stp, unsigned short flags,
 717                               int filter_level)
 718 {
 719         static char *lastdir;
 720         static int lastdir_len = -1;
 721         struct file_struct *file;
 722         STRUCT_STAT st;
 723         char sum[SUM_LENGTH];
 724         char thisname[MAXPATHLEN];
 725         char linkname[MAXPATHLEN];
 726         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 727         char *basename, *dirname, *bp;
 728
 729         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 730                 lastdir_len = -1;
 731
 732         if (strlcpy(thisname, fname, sizeof thisname)
 733             >= sizeof thisname - flist_dir_len) {
 734                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 735                 return NULL;
 736         }
 737         clean_fname(thisname, 0);
 738         if (sanitize_paths)
 739                 sanitize_path(thisname, thisname, "", 0, NULL);
 740
 741         memset(sum, 0, SUM_LENGTH);
 742
 743         if (stp && S_ISDIR(stp->st_mode))
 744                 st = *stp; /* Needed for "symlink/." with --relative. */
 745         else if (readlink_stat(thisname, &st, linkname) != 0) {
 746                 int save_errno = errno;
 747                 /* See if file is excluded before reporting an error. */
 748                 if (filter_level != NO_FILTERS
 749                     && is_excluded(thisname, 0, filter_level))
 750                         return NULL;
 751                 if (save_errno == ENOENT) {
 752 #ifdef SUPPORT_LINKS
 753                         /* Avoid "vanished" error if symlink points nowhere. */
 754                         if (copy_links && do_lstat(thisname, &st) == 0
 755                             && S_ISLNK(st.st_mode)) {
 756                                 io_error |= IOERR_GENERAL;
 757                                 rprintf(FERROR, "symlink has no referent: %s\n",
 758                                         full_fname(thisname));
 759                         } else
 760 #endif
 761                         {
 762                                 enum logcode c = am_daemon && protocol_version < 28
 763                                     ? FERROR : FINFO;
 764                                 io_error |= IOERR_VANISHED;
 765                                 rprintf(c, "file has vanished: %s\n",
 766                                         full_fname(thisname));
 767                         }
 768                 } else {
 769                         io_error |= IOERR_GENERAL;
 770                         rsyserr(FERROR, save_errno, "readlink %s failed",
 771                                 full_fname(thisname));
 772                 }
 773                 return NULL;
 774         }
 775
 776         /* backup.c calls us with filter_level set to NO_FILTERS. */
 777         if (filter_level == NO_FILTERS)
 778                 goto skip_filters;
 779
 780         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 781                 rprintf(FINFO, "skipping directory %s\n", thisname);
 782                 return NULL;
 783         }
 784
 785         /* We only care about directories because we need to avoid recursing
 786          * into a mount-point directory, not to avoid copying a symlinked
 787          * file if -L (or similar) was specified. */
 788         if (one_file_system && st.st_dev != filesystem_dev
 789          && S_ISDIR(st.st_mode)) {
 790                 if (one_file_system > 1) {
 791                         if (verbose > 2) {
 792                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 793                                         thisname);
 794                         }
 795                         return NULL;
 796                 }
 797                 flags |= FLAG_MOUNT_POINT;
 798         }
 799
 800         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 801                 return NULL;
 802
 803         if (lp_ignore_nonreadable(module_id)) {
 804 #ifdef SUPPORT_LINKS
 805                 if (!S_ISLNK(st.st_mode))
 806 #endif
 807                         if (access(thisname, R_OK) != 0)
 808                                 return NULL;
 809         }
 810
 811   skip_filters:
 812
 813         if (verbose > 2) {
 814                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 815                         who_am_i(), thisname, filter_level);
 816         }
 817
 818         if ((basename = strrchr(thisname, '/')) != NULL) {
 819                 dirname_len = ++basename - thisname; /* counts future '\0' */
 820                 if (lastdir_len == dirname_len - 1
 821                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 822                         dirname = lastdir;
 823                         dirname_len = 0; /* indicates no copy is needed */
 824                 } else
 825                         dirname = thisname;
 826         } else {
 827                 basename = thisname;
 828                 dirname = NULL;
 829                 dirname_len = 0;
 830         }
 831         basename_len = strlen(basename) + 1; /* count the '\0' */
 832
 833 #ifdef SUPPORT_LINKS
 834         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 835 #else
 836         linkname_len = 0;
 837 #endif
 838
 839         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 840                 ? MD4_SUM_LENGTH : 0;
 841
 842         alloc_len = file_struct_len + dirname_len + basename_len
 843                   + linkname_len + sum_len;
 844         if (flist)
 845                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 846         else {
 847                 if (!(bp = new_array(char, alloc_len)))
 848                         out_of_memory("make_file");
 849         }
 850
 851         file = (struct file_struct *)bp;
 852         memset(bp, 0, file_struct_len);
 853         bp += file_struct_len;
 854
 855         file->flags = flags;
 856         file->modtime = st.st_mtime;
 857         file->length = st.st_size;
 858         file->mode = st.st_mode;
 859         file->uid = st.st_uid;
 860         file->gid = st.st_gid;
 861
 862 #ifdef SUPPORT_HARD_LINKS
 863         if (flist && flist->hlink_pool) {
 864                 if (protocol_version < 28) {
 865                         if (S_ISREG(st.st_mode))
 866                                 file->link_u.idev = pool_talloc(
 867                                     flist->hlink_pool, struct idev, 1,
 868                                     "inode_table");
 869                 } else {
 870                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 871                                 file->link_u.idev = pool_talloc(
 872                                     flist->hlink_pool, struct idev, 1,
 873                                     "inode_table");
 874                 }
 875         }
 876         if (file->link_u.idev) {
 877                 file->F_DEV = st.st_dev;
 878                 file->F_INODE = st.st_ino;
 879         }
 880 #endif
 881
 882         if (dirname_len) {
 883                 file->dirname = lastdir = bp;
 884                 lastdir_len = dirname_len - 1;
 885                 memcpy(bp, dirname, dirname_len - 1);
 886                 bp += dirname_len;
 887                 bp[-1] = '\0';
 888         } else if (dirname)
 889                 file->dirname = dirname;
 890
 891         file->basename = bp;
 892         memcpy(bp, basename, basename_len);
 893         bp += basename_len;
 894
 895 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 896         if ((preserve_devices && IS_DEVICE(st.st_mode))
 897          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 898                 file->u.rdev = st.st_rdev;
 899 #endif
 900
 901 #ifdef SUPPORT_LINKS
 902         if (linkname_len) {
 903                 file->u.link = bp;
 904                 memcpy(bp, linkname, linkname_len);
 905                 bp += linkname_len;
 906         }
 907 #endif
 908
 909         if (sum_len) {
 910                 file->u.sum = bp;
 911                 file_checksum(thisname, bp, st.st_size);
 912                 /*bp += sum_len;*/
 913         }
 914
 915         file->dir.root = flist_dir;
 916
 917         /* This code is only used by the receiver when it is building
 918          * a list of files for a delete pass. */
 919         if (keep_dirlinks && linkname_len && flist) {
 920                 STRUCT_STAT st2;
 921                 int save_mode = file->mode;
 922                 file->mode = S_IFDIR; /* Find a directory with our name. */
 923                 if (flist_find(the_file_list, file) >= 0
 924                     && safe_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 925                         file->modtime = st2.st_mtime;
 926                         file->length = st2.st_size;
 927                         file->mode = st2.st_mode;
 928                         file->uid = st2.st_uid;
 929                         file->gid = st2.st_gid;
 930                         file->u.link = NULL;
 931                 } else
 932                         file->mode = save_mode;
 933         }
 934
 935         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 936                 stats.total_size += st.st_size;
 937
 938         return file;
 939 }
 940
 941 static struct file_struct *send_file_name(int f, struct file_list *flist,
 942                                           char *fname, STRUCT_STAT *stp,
 943                                           unsigned short flags)
 944 {
 945         struct file_struct *file;
 946
 947         file = make_file(fname, flist, stp, flags,
 948                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 949         if (!file)
 950                 return NULL;
 951
 952         if (chmod_modes && !S_ISLNK(file->mode))
 953                 file->mode = tweak_mode(file->mode, chmod_modes);
 954
 955         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 956
 957         flist_expand(flist);
 958
 959         if (file->basename[0]) {
 960                 flist->files[flist->count++] = file;
 961                 send_file_entry(file, f);
 962         }
 963         return file;
 964 }
 965
 966 static void send_if_directory(int f, struct file_list *flist,
 967                               struct file_struct *file,
 968                               char *fbuf, unsigned int ol)
 969 {
 970         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 971
 972         if (S_ISDIR(file->mode)
 973             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 974                 void *save_filters;
 975                 unsigned int len = strlen(fbuf);
 976                 if (len > 1 && fbuf[len-1] == '/')
 977                         fbuf[--len] = '\0';
 978                 if (len >= MAXPATHLEN - 1) {
 979                         io_error |= IOERR_GENERAL;
 980                         rprintf(FERROR, "skipping long-named directory: %s\n",
 981                                 full_fname(fbuf));
 982                         return;
 983                 }
 984                 save_filters = push_local_filters(fbuf, len);
 985                 send_directory(f, flist, fbuf, len);
 986                 pop_local_filters(save_filters);
 987                 fbuf[ol] = '\0';
 988                 if (is_dot_dir)
 989                         fbuf[ol-1] = '.';
 990         }
 991 }
 992
 993 /* This function is normally called by the sender, but the receiving side also
 994  * calls it from get_dirlist() with f set to -1 so that we just construct the
 995  * file list in memory without sending it over the wire.  Also, get_dirlist()
 996  * might call this with f set to -2, which also indicates that local filter
 997  * rules should be ignored. */
 998 static void send_directory(int f, struct file_list *flist,
 999                            char *fbuf, int len)
1000 {
1001         struct dirent *di;
1002         unsigned remainder;
1003         char *p;
1004         DIR *d;
1005         int start = flist->count;
1006
1007         if (!(d = opendir(fbuf))) {
1008                 io_error |= IOERR_GENERAL;
1009                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1010                 return;
1011         }
1012
1013         p = fbuf + len;
1014         if (len != 1 || *fbuf != '/')
1015                 *p++ = '/';
1016         *p = '\0';
1017         remainder = MAXPATHLEN - (p - fbuf);
1018
1019         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1020                 char *dname = d_name(di);
1021                 if (dname[0] == '.' && (dname[1] == '\0'
1022                     || (dname[1] == '.' && dname[2] == '\0')))
1023                         continue;
1024                 if (strlcpy(p, dname, remainder) >= remainder) {
1025                         io_error |= IOERR_GENERAL;
1026                         rprintf(FINFO,
1027                                 "cannot send long-named file %s\n",
1028                                 full_fname(fbuf));
1029                         continue;
1030                 }
1031
1032                 send_file_name(f, flist, fbuf, NULL, 0);
1033         }
1034
1035         fbuf[len] = '\0';
1036
1037         if (errno) {
1038                 io_error |= IOERR_GENERAL;
1039                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1040         }
1041
1042         closedir(d);
1043
1044         if (recurse) {
1045                 int i, end = flist->count - 1;
1046                 for (i = start; i <= end; i++)
1047                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1048         }
1049 }
1050
1051 struct file_list *send_file_list(int f, int argc, char *argv[])
1052 {
1053         int len;
1054         STRUCT_STAT st;
1055         char *p, *dir, olddir[sizeof curr_dir];
1056         char lastpath[MAXPATHLEN] = "";
1057         struct file_list *flist;
1058         struct timeval start_tv, end_tv;
1059         int64 start_write;
1060         int use_ff_fd = 0;
1061
1062         if (show_filelist_p())
1063                 start_filelist_progress("building file list");
1064
1065         start_write = stats.total_written;
1066         gettimeofday(&start_tv, NULL);
1067
1068         flist = flist_new(WITH_HLINK, "send_file_list");
1069
1070         io_start_buffering_out();
1071         if (filesfrom_fd >= 0) {
1072                 if (sanitize_paths)
1073                         die_on_unsafe_path(argv[0], 0);
1074                 if (argv[0] && !push_dir(argv[0])) {
1075                         rsyserr(FERROR, errno, "push_dir %s failed",
1076                                 full_fname(argv[0]));
1077                         exit_cleanup(RERR_FILESELECT);
1078                 }
1079                 use_ff_fd = 1;
1080         }
1081
1082         while (1) {
1083                 char fbuf[MAXPATHLEN];
1084                 char *fn;
1085                 int is_dot_dir;
1086
1087                 if (use_ff_fd) {
1088                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1089                                 break;
1090                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1091                 } else {
1092                         if (argc-- == 0)
1093                                 break;
1094                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1095                         if (sanitize_paths)
1096                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1097                 }
1098
1099                 len = strlen(fbuf);
1100                 if (relative_paths) {
1101                         /* We clean up fbuf below. */
1102                         is_dot_dir = 0;
1103                 } else if (!len || fbuf[len - 1] == '/') {
1104                         if (len == 2 && fbuf[0] == '.') {
1105                                 /* Turn "./" into just "." rather than "./." */
1106                                 fbuf[1] = '\0';
1107                         } else {
1108                                 if (len + 1 >= MAXPATHLEN)
1109                                         overflow_exit("send_file_list");
1110                                 fbuf[len++] = '.';
1111                                 fbuf[len] = '\0';
1112                         }
1113                         is_dot_dir = 1;
1114                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1115                     && (len == 2 || fbuf[len-3] == '/')) {
1116                         if (len + 2 >= MAXPATHLEN)
1117                                 overflow_exit("send_file_list");
1118                         fbuf[len++] = '/';
1119                         fbuf[len++] = '.';
1120                         fbuf[len] = '\0';
1121                         is_dot_dir = 1;
1122                 } else {
1123                         is_dot_dir = fbuf[len-1] == '.'
1124                                    && (len == 1 || fbuf[len-2] == '/');
1125                 }
1126
1127                 if (sanitize_paths)
1128                         die_on_unsafe_path(fbuf, 1);
1129                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1130                         io_error |= IOERR_GENERAL;
1131                         rsyserr(FERROR, errno, "link_stat %s failed",
1132                                 full_fname(fbuf));
1133                         continue;
1134                 }
1135
1136                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1137                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1138                         continue;
1139                 }
1140
1141                 dir = NULL;
1142                 olddir[0] = '\0';
1143
1144                 if (!relative_paths) {
1145                         p = strrchr(fbuf, '/');
1146                         if (p) {
1147                                 *p = '\0';
1148                                 if (p == fbuf)
1149                                         dir = "/";
1150                                 else
1151                                         dir = fbuf;
1152                                 len -= p - fbuf + 1;
1153                                 fn = p + 1;
1154                         } else
1155                                 fn = fbuf;
1156                 } else {
1157                         if ((p = strstr(fbuf, "/./")) != NULL) {
1158                                 *p = '\0';
1159                                 if (p == fbuf)
1160                                         dir = "/";
1161                                 else
1162                                         dir = fbuf;
1163                                 len -= p - fbuf + 3;
1164                                 fn = p + 3;
1165                         } else
1166                                 fn = fbuf;
1167                         /* Get rid of trailing "/" and "/.". */
1168                         while (len) {
1169                                 if (fn[len - 1] == '/') {
1170                                         is_dot_dir = 1;
1171                                         if (!--len && !dir) {
1172                                                 len++;
1173                                                 break;
1174                                         }
1175                                 }
1176                                 else if (len >= 2 && fn[len - 1] == '.'
1177                                                   && fn[len - 2] == '/') {
1178                                         is_dot_dir = 1;
1179                                         if (!(len -= 2) && !dir) {
1180                                                 len++;
1181                                                 break;
1182                                         }
1183                                 } else
1184                                         break;
1185                         }
1186                         fn[len] = '\0';
1187                         /* Reject a ".." dir in the active part of the path. */
1188                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1189                                 if ((p[2] == '/' || p[2] == '\0')
1190                                  && (p == fn || p[-1] == '/')) {
1191                                         rprintf(FERROR,
1192                                             "found \"..\" dir in relative path: %s\n",
1193                                             fbuf);
1194                                         exit_cleanup(RERR_SYNTAX);
1195                                 }
1196                         }
1197                 }
1198
1199                 if (!*fn) {
1200                         len = 1;
1201                         fn = ".";
1202                 }
1203
1204                 if (dir && *dir) {
1205                         static char *lastdir;
1206                         static int lastdir_len;
1207
1208                         strlcpy(olddir, curr_dir, sizeof olddir);
1209
1210                         if (!push_dir(dir)) {
1211                                 io_error |= IOERR_GENERAL;
1212                                 rsyserr(FERROR, errno, "push_dir %s failed",
1213                                         full_fname(dir));
1214                                 continue;
1215                         }
1216
1217                         if (lastdir && strcmp(lastdir, dir) == 0) {
1218                                 flist_dir = lastdir;
1219                                 flist_dir_len = lastdir_len;
1220                         } else {
1221                                 flist_dir = lastdir = strdup(dir);
1222                                 flist_dir_len = lastdir_len = strlen(dir);
1223                         }
1224                 }
1225
1226                 if (fn != fbuf)
1227                         memmove(fbuf, fn, len + 1);
1228
1229                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1230                         /* Send the implied directories at the start of the
1231                          * source spec, so we get their permissions right. */
1232                         char *lp = lastpath, *slash = fbuf;
1233                         *p = '\0';
1234                         /* Skip any initial directories in our path that we
1235                          * have in common with lastpath. */
1236                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1237                                 if (*fn == '/')
1238                                         slash = fn;
1239                         }
1240                         *p = '/';
1241                         if (fn != p || (*lp && *lp != '/')) {
1242                                 int save_copy_links = copy_links;
1243                                 int save_xfer_dirs = xfer_dirs;
1244                                 copy_links |= copy_unsafe_links;
1245                                 xfer_dirs = 1;
1246                                 while ((slash = strchr(slash+1, '/')) != 0) {
1247                                         *slash = '\0';
1248                                         send_file_name(f, flist, fbuf, NULL, 0);
1249                                         *slash = '/';
1250                                 }
1251                                 copy_links = save_copy_links;
1252                                 xfer_dirs = save_xfer_dirs;
1253                                 *p = '\0';
1254                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1255                                 *p = '/';
1256                         }
1257                 }
1258
1259                 if (one_file_system)
1260                         filesystem_dev = st.st_dev;
1261
1262                 if (recurse || (xfer_dirs && is_dot_dir)) {
1263                         struct file_struct *file;
1264                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1265                         if (file)
1266                                 send_if_directory(f, flist, file, fbuf, len);
1267                 } else
1268                         send_file_name(f, flist, fbuf, &st, 0);
1269
1270                 if (olddir[0]) {
1271                         flist_dir = NULL;
1272                         flist_dir_len = 0;
1273                         if (!pop_dir(olddir)) {
1274                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1275                                         full_fname(olddir));
1276                                 exit_cleanup(RERR_FILESELECT);
1277                         }
1278                 }
1279         }
1280
1281         gettimeofday(&end_tv, NULL);
1282         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1283                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1284         if (stats.flist_buildtime == 0)
1285                 stats.flist_buildtime = 1;
1286         start_tv = end_tv;
1287
1288         send_file_entry(NULL, f);
1289
1290         if (show_filelist_p())
1291                 finish_filelist_progress(flist);
1292
1293         gettimeofday(&end_tv, NULL);
1294         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1295                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1296
1297         if (flist->hlink_pool) {
1298                 pool_destroy(flist->hlink_pool);
1299                 flist->hlink_pool = NULL;
1300         }
1301
1302         /* Sort the list without removing any duplicates.  This allows the
1303          * receiving side to ask for any name they like, which gives us the
1304          * flexibility to change the way we unduplicate names in the future
1305          * without causing a compatibility problem with older versions. */
1306         clean_flist(flist, 0, 0);
1307
1308         send_uid_list(f);
1309
1310         /* send the io_error flag */
1311         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1312
1313         io_end_buffering();
1314         stats.flist_size = stats.total_written - start_write;
1315         stats.num_files = flist->count;
1316
1317         if (verbose > 3)
1318                 output_flist(flist);
1319
1320         if (verbose > 2)
1321                 rprintf(FINFO, "send_file_list done\n");
1322
1323         return flist;
1324 }
1325
1326 struct file_list *recv_file_list(int f)
1327 {
1328         struct file_list *flist;
1329         unsigned short flags;
1330         int64 start_read;
1331
1332         if (show_filelist_p())
1333                 start_filelist_progress("receiving file list");
1334
1335         start_read = stats.total_read;
1336
1337         flist = flist_new(WITH_HLINK, "recv_file_list");
1338
1339         flist->count = 0;
1340         flist->malloced = 1000;
1341         flist->files = new_array(struct file_struct *, flist->malloced);
1342         if (!flist->files)
1343                 goto oom;
1344
1345         while ((flags = read_byte(f)) != 0) {
1346                 struct file_struct *file;
1347
1348                 flist_expand(flist);
1349
1350                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1351                         flags |= read_byte(f) << 8;
1352                 file = receive_file_entry(flist, flags, f);
1353
1354                 if (S_ISREG(file->mode) || S_ISLNK(file->mode))
1355                         stats.total_size += file->length;
1356
1357                 flist->files[flist->count++] = file;
1358
1359                 maybe_emit_filelist_progress(flist->count);
1360
1361                 if (verbose > 2) {
1362                         rprintf(FINFO, "recv_file_name(%s)\n",
1363                                 f_name(file, NULL));
1364                 }
1365         }
1366         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1367
1368         if (verbose > 2)
1369                 rprintf(FINFO, "received %d names\n", flist->count);
1370
1371         if (show_filelist_p())
1372                 finish_filelist_progress(flist);
1373
1374         clean_flist(flist, relative_paths, 1);
1375
1376         if (f >= 0) {
1377                 recv_uid_list(f, flist);
1378
1379                 /* Recv the io_error flag */
1380                 if (lp_ignore_errors(module_id) || ignore_errors)
1381                         read_int(f);
1382                 else
1383                         io_error |= read_int(f);
1384         }
1385
1386         if (verbose > 3)
1387                 output_flist(flist);
1388
1389         if (list_only) {
1390                 int i;
1391                 for (i = 0; i < flist->count; i++)
1392                         list_file_entry(flist->files[i]);
1393         }
1394
1395         if (verbose > 2)
1396                 rprintf(FINFO, "recv_file_list done\n");
1397
1398         stats.flist_size = stats.total_read - start_read;
1399         stats.num_files = flist->count;
1400
1401         return flist;
1402
1403   oom:
1404         out_of_memory("recv_file_list");
1405         return NULL;            /* not reached */
1406 }
1407
1408 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1409 {
1410         return f_name_cmp(*file1, *file2);
1411 }
1412
1413 /* Search for an identically-named item in the file list.  Note that the
1414  * items must agree in their directory-ness, or no match is returned. */
1415 int flist_find(struct file_list *flist, struct file_struct *f)
1416 {
1417         int low = flist->low, high = flist->high;
1418         int diff, mid, mid_up;
1419
1420         while (low <= high) {
1421                 mid = (low + high) / 2;
1422                 if (flist->files[mid]->basename)
1423                         mid_up = mid;
1424                 else {
1425                         /* Scan for the next non-empty entry using the cached
1426                          * distance values.  If the value isn't fully up-to-
1427                          * date, update it. */
1428                         mid_up = mid + flist->files[mid]->dir.depth;
1429                         if (!flist->files[mid_up]->basename) {
1430                                 do {
1431                                     mid_up += flist->files[mid_up]->dir.depth;
1432                                 } while (!flist->files[mid_up]->basename);
1433                                 flist->files[mid]->dir.depth = mid_up - mid;
1434                         }
1435                         if (mid_up > high) {
1436                                 /* If there's nothing left above us, set high to
1437                                  * a non-empty entry below us and continue. */
1438                                 high = mid - flist->files[mid]->length;
1439                                 if (!flist->files[high]->basename) {
1440                                         do {
1441                                             high -= flist->files[high]->length;
1442                                         } while (!flist->files[high]->basename);
1443                                         flist->files[mid]->length = mid - high;
1444                                 }
1445                                 continue;
1446                         }
1447                 }
1448                 diff = f_name_cmp(flist->files[mid_up], f);
1449                 if (diff == 0) {
1450                         if (protocol_version < 29
1451                             && S_ISDIR(flist->files[mid_up]->mode)
1452                             != S_ISDIR(f->mode))
1453                                 return -1;
1454                         return mid_up;
1455                 }
1456                 if (diff < 0)
1457                         low = mid_up + 1;
1458                 else
1459                         high = mid - 1;
1460         }
1461         return -1;
1462 }
1463
1464 /*
1465  * Free up any resources a file_struct has allocated
1466  * and clear the file.
1467  */
1468 void clear_file(struct file_struct *file, struct file_list *flist)
1469 {
1470         if (flist->hlink_pool && file->link_u.idev)
1471                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1472         memset(file, 0, file_struct_len);
1473         /* In an empty entry, dir.depth is an offset to the next non-empty
1474          * entry.  Likewise for length in the opposite direction.  We assume
1475          * that we're alone for now since flist_find() will adjust the counts
1476          * it runs into that aren't up-to-date. */
1477         file->length = file->dir.depth = 1;
1478 }
1479
1480 /*
1481  * allocate a new file list
1482  */
1483 struct file_list *flist_new(int with_hlink, char *msg)
1484 {
1485         struct file_list *flist;
1486
1487         flist = new(struct file_list);
1488         if (!flist)
1489                 out_of_memory(msg);
1490
1491         memset(flist, 0, sizeof (struct file_list));
1492
1493         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1494             out_of_memory, POOL_INTERN)))
1495                 out_of_memory(msg);
1496
1497 #ifdef SUPPORT_HARD_LINKS
1498         if (with_hlink && preserve_hard_links) {
1499                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1500                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1501                         out_of_memory(msg);
1502         }
1503 #endif
1504
1505         return flist;
1506 }
1507
1508 /*
1509  * free up all elements in a flist
1510  */
1511 void flist_free(struct file_list *flist)
1512 {
1513         pool_destroy(flist->file_pool);
1514         pool_destroy(flist->hlink_pool);
1515         free(flist->files);
1516         free(flist);
1517 }
1518
1519 /*
1520  * This routine ensures we don't have any duplicate names in our file list.
1521  * duplicate names can cause corruption because of the pipelining
1522  */
1523 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1524 {
1525         char fbuf[MAXPATHLEN];
1526         int i, prev_i = 0;
1527
1528         if (!flist)
1529                 return;
1530         if (flist->count == 0) {
1531                 flist->high = -1;
1532                 return;
1533         }
1534
1535         qsort(flist->files, flist->count,
1536             sizeof flist->files[0], (int (*)())file_compare);
1537
1538         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1539                 if (flist->files[i]->basename) {
1540                         prev_i = i;
1541                         break;
1542                 }
1543         }
1544         flist->low = prev_i;
1545         while (++i < flist->count) {
1546                 int j;
1547                 struct file_struct *file = flist->files[i];
1548
1549                 if (!file->basename)
1550                         continue;
1551                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1552                         j = prev_i;
1553                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1554                         int save_mode = file->mode;
1555                         /* Make sure that this directory doesn't duplicate a
1556                          * non-directory earlier in the list. */
1557                         flist->high = prev_i;
1558                         file->mode = S_IFREG;
1559                         j = flist_find(flist, file);
1560                         file->mode = save_mode;
1561                 } else
1562                         j = -1;
1563                 if (j >= 0) {
1564                         struct file_struct *fp = flist->files[j];
1565                         int keep, drop;
1566                         /* If one is a dir and the other is not, we want to
1567                          * keep the dir because it might have contents in the
1568                          * list. */
1569                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1570                                 if (S_ISDIR(file->mode))
1571                                         keep = i, drop = j;
1572                                 else
1573                                         keep = j, drop = i;
1574                         } else
1575                                 keep = j, drop = i;
1576                         if (verbose > 1 && !am_server) {
1577                                 rprintf(FINFO,
1578                                         "removing duplicate name %s from file list (%d)\n",
1579                                         f_name(file, fbuf), drop);
1580                         }
1581                         /* Make sure we don't lose track of a user-specified
1582                          * top directory. */
1583                         flist->files[keep]->flags |= flist->files[drop]->flags
1584                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1585
1586                         clear_file(flist->files[drop], flist);
1587
1588                         if (keep == i) {
1589                                 if (flist->low == drop) {
1590                                         for (j = drop + 1;
1591                                              j < i && !flist->files[j]->basename;
1592                                              j++) {}
1593                                         flist->low = j;
1594                                 }
1595                                 prev_i = i;
1596                         }
1597                 } else
1598                         prev_i = i;
1599         }
1600         flist->high = no_dups ? prev_i : flist->count - 1;
1601
1602         if (strip_root) {
1603                 /* We need to strip off the leading slashes for relative
1604                  * paths, but this must be done _after_ the sorting phase. */
1605                 for (i = flist->low; i <= flist->high; i++) {
1606                         struct file_struct *file = flist->files[i];
1607
1608                         if (!file->dirname)
1609                                 continue;
1610                         while (*file->dirname == '/')
1611                                 file->dirname++;
1612                         if (!*file->dirname)
1613                                 file->dirname = NULL;
1614                 }
1615         }
1616
1617         if (prune_empty_dirs && no_dups) {
1618                 int j, prev_depth = 0;
1619
1620                 prev_i = 0; /* It's OK that this isn't really true. */
1621
1622                 for (i = flist->low; i <= flist->high; i++) {
1623                         struct file_struct *fp, *file = flist->files[i];
1624
1625                         /* This temporarily abuses the dir.depth value for a
1626                          * directory that is in a chain that might get pruned.
1627                          * We restore the old value if it gets a reprieve. */
1628                         if (S_ISDIR(file->mode) && file->dir.depth) {
1629                                 /* Dump empty dirs when coming back down. */
1630                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1631                                         fp = flist->files[prev_i];
1632                                         if (fp->dir.depth >= 0)
1633                                                 break;
1634                                         prev_i = -fp->dir.depth-1;
1635                                         clear_file(fp, flist);
1636                                 }
1637                                 prev_depth = file->dir.depth;
1638                                 if (is_excluded(f_name(file, fbuf), 1,
1639                                                        ALL_FILTERS)) {
1640                                         /* Keep dirs through this dir. */
1641                                         for (j = prev_depth-1; ; j--) {
1642                                                 fp = flist->files[prev_i];
1643                                                 if (fp->dir.depth >= 0)
1644                                                         break;
1645                                                 prev_i = -fp->dir.depth-1;
1646                                                 fp->dir.depth = j;
1647                                         }
1648                                 } else
1649                                         file->dir.depth = -prev_i-1;
1650                                 prev_i = i;
1651                         } else {
1652                                 /* Keep dirs through this non-dir. */
1653                                 for (j = prev_depth; ; j--) {
1654                                         fp = flist->files[prev_i];
1655                                         if (fp->dir.depth >= 0)
1656                                                 break;
1657                                         prev_i = -fp->dir.depth-1;
1658                                         fp->dir.depth = j;
1659                                 }
1660                         }
1661                 }
1662                 /* Dump empty all remaining empty dirs. */
1663                 while (1) {
1664                         struct file_struct *fp = flist->files[prev_i];
1665                         if (fp->dir.depth >= 0)
1666                                 break;
1667                         prev_i = -fp->dir.depth-1;
1668                         clear_file(fp, flist);
1669                 }
1670
1671                 for (i = flist->low; i <= flist->high; i++) {
1672                         if (flist->files[i]->basename)
1673                                 break;
1674                 }
1675                 flist->low = i;
1676                 for (i = flist->high; i >= flist->low; i--) {
1677                         if (flist->files[i]->basename)
1678                                 break;
1679                 }
1680                 flist->high = i;
1681         }
1682 }
1683
1684 static void output_flist(struct file_list *flist)
1685 {
1686         char uidbuf[16], gidbuf[16], depthbuf[16];
1687         struct file_struct *file;
1688         const char *who = who_am_i();
1689         int i;
1690
1691         for (i = 0; i < flist->count; i++) {
1692                 file = flist->files[i];
1693                 if ((am_root || am_sender) && preserve_uid)
1694                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1695                 else
1696                         *uidbuf = '\0';
1697                 if (preserve_gid && file->gid != GID_NONE)
1698                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1699                 else
1700                         *gidbuf = '\0';
1701                 if (!am_sender)
1702                         sprintf(depthbuf, "%d", file->dir.depth);
1703                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1704                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1705                         file->dirname ? file->dirname : "",
1706                         file->dirname ? "/" : "", NS(file->basename),
1707                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1708                         (double)file->length, uidbuf, gidbuf, file->flags);
1709         }
1710 }
1711
1712 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1713 enum fnc_type { t_PATH, t_ITEM };
1714
1715 /* Compare the names of two file_struct entities, similar to how strcmp()
1716  * would do if it were operating on the joined strings.
1717  *
1718  * Some differences beginning with protocol_version 29: (1) directory names
1719  * are compared with an assumed trailing slash so that they compare in a
1720  * way that would cause them to sort immediately prior to any content they
1721  * may have; (2) a directory of any name compares after a non-directory of
1722  * any name at the same depth; (3) a directory with name "." compares prior
1723  * to anything else.  These changes mean that a directory and a non-dir
1724  * with the same name will not compare as equal (protocol_version >= 29).
1725  *
1726  * The dirname component can be an empty string, but the basename component
1727  * cannot (and never is in the current codebase).  The basename component
1728  * may be NULL (for a removed item), in which case it is considered to be
1729  * after any existing item. */
1730 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1731 {
1732         int dif;
1733         const uchar *c1, *c2;
1734         enum fnc_state state1, state2;
1735         enum fnc_type type1, type2;
1736         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1737
1738         if (!f1 || !f1->basename) {
1739                 if (!f2 || !f2->basename)
1740                         return 0;
1741                 return -1;
1742         }
1743         if (!f2 || !f2->basename)
1744                 return 1;
1745
1746         c1 = (uchar*)f1->dirname;
1747         c2 = (uchar*)f2->dirname;
1748         if (c1 == c2)
1749                 c1 = c2 = NULL;
1750         if (!c1) {
1751                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1752                 c1 = (uchar*)f1->basename;
1753                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1754                         type1 = t_ITEM;
1755                         state1 = s_TRAILING;
1756                         c1 = (uchar*)"";
1757                 } else
1758                         state1 = s_BASE;
1759         } else if (!*c1) {
1760                 type1 = t_path;
1761                 state1 = s_SLASH;
1762                 c1 = (uchar*)"/";
1763         } else {
1764                 type1 = t_path;
1765                 state1 = s_DIR;
1766         }
1767         if (!c2) {
1768                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1769                 c2 = (uchar*)f2->basename;
1770                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1771                         type2 = t_ITEM;
1772                         state2 = s_TRAILING;
1773                         c2 = (uchar*)"";
1774                 } else
1775                         state2 = s_BASE;
1776         } else if (!*c2) {
1777                 type2 = t_path;
1778                 state2 = s_SLASH;
1779                 c2 = (uchar*)"/";
1780         } else {
1781                 type2 = t_path;
1782                 state2 = s_DIR;
1783         }
1784
1785         if (type1 != type2)
1786                 return type1 == t_PATH ? 1 : -1;
1787
1788         while (1) {
1789                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1790                         break;
1791                 if (!*c1) {
1792                         switch (state1) {
1793                         case s_DIR:
1794                                 state1 = s_SLASH;
1795                                 c1 = (uchar*)"/";
1796                                 break;
1797                         case s_SLASH:
1798                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1799                                 c1 = (uchar*)f1->basename;
1800                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1801                                         type1 = t_ITEM;
1802                                         state1 = s_TRAILING;
1803                                         c1 = (uchar*)"";
1804                                 } else
1805                                         state1 = s_BASE;
1806                                 break;
1807                         case s_BASE:
1808                                 state1 = s_TRAILING;
1809                                 if (type1 == t_PATH) {
1810                                         c1 = (uchar*)"/";
1811                                         break;
1812                                 }
1813                                 /* FALL THROUGH */
1814                         case s_TRAILING:
1815                                 type1 = t_ITEM;
1816                                 break;
1817                         }
1818                         if (*c2 && type1 != type2)
1819                                 return type1 == t_PATH ? 1 : -1;
1820                 }
1821                 if (!*c2) {
1822                         switch (state2) {
1823                         case s_DIR:
1824                                 state2 = s_SLASH;
1825                                 c2 = (uchar*)"/";
1826                                 break;
1827                         case s_SLASH:
1828                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1829                                 c2 = (uchar*)f2->basename;
1830                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1831                                         type2 = t_ITEM;
1832                                         state2 = s_TRAILING;
1833                                         c2 = (uchar*)"";
1834                                 } else
1835                                         state2 = s_BASE;
1836                                 break;
1837                         case s_BASE:
1838                                 state2 = s_TRAILING;
1839                                 if (type2 == t_PATH) {
1840                                         c2 = (uchar*)"/";
1841                                         break;
1842                                 }
1843                                 /* FALL THROUGH */
1844                         case s_TRAILING:
1845                                 if (!*c1)
1846                                         return 0;
1847                                 type2 = t_ITEM;
1848                                 break;
1849                         }
1850                         if (type1 != type2)
1851                                 return type1 == t_PATH ? 1 : -1;
1852                 }
1853         }
1854
1855         return dif;
1856 }
1857
1858 /* Return a copy of the full filename of a flist entry, using the indicated
1859  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1860  * done because we checked the size when creating the file_struct entry.
1861  */
1862 char *f_name(struct file_struct *f, char *fbuf)
1863 {
1864         if (!f || !f->basename)
1865                 return NULL;
1866
1867         if (!fbuf) {
1868                 static char names[5][MAXPATHLEN];
1869                 static unsigned int n;
1870
1871                 n = (n + 1) % (sizeof names / sizeof names[0]);
1872
1873                 fbuf = names[n];
1874         }
1875
1876         if (f->dirname) {
1877                 int len = strlen(f->dirname);
1878                 memcpy(fbuf, f->dirname, len);
1879                 fbuf[len] = '/';
1880                 strcpy(fbuf + len + 1, f->basename);
1881         } else
1882                 strcpy(fbuf, f->basename);
1883
1884         return fbuf;
1885 }
1886
1887 /* Do a non-recursive scan of the named directory, possibly ignoring all
1888  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1889  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1890  * buffer (the functions we call will append names onto the end, but the old
1891  * dir value will be restored on exit). */
1892 struct file_list *get_dirlist(char *dirname, int dlen,
1893                               int ignore_filter_rules)
1894 {
1895         struct file_list *dirlist;
1896         char dirbuf[MAXPATHLEN];
1897         int save_recurse = recurse;
1898         int save_xfer_dirs = xfer_dirs;
1899
1900         if (dlen < 0) {
1901                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1902                 if (dlen >= MAXPATHLEN)
1903                         return NULL;
1904                 dirname = dirbuf;
1905         }
1906
1907         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1908
1909         recurse = 0;
1910         xfer_dirs = 1;
1911         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1912         xfer_dirs = save_xfer_dirs;
1913         recurse = save_recurse;
1914         if (do_progress)
1915                 flist_count_offset += dirlist->count;
1916
1917         clean_flist(dirlist, 0, 0);
1918
1919         if (verbose > 3)
1920                 output_flist(dirlist);
1921
1922         return dirlist;
1923 }