flist.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /** @file flist.c
  22  * Generate and receive file lists
  23  *
  24  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
  25  *
  26  **/
  27
  28 #include "rsync.h"
  29
  30 extern int verbose;
  31 extern int dry_run;
  32 extern int list_only;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_daemon;
  36 extern int am_sender;
  37 extern int do_progress;
  38 extern int always_checksum;
  39 extern int module_id;
  40 extern int ignore_errors;
  41 extern int numeric_ids;
  42 extern int recurse;
  43 extern int xfer_dirs;
  44 extern int filesfrom_fd;
  45 extern int one_file_system;
  46 extern int keep_dirlinks;
  47 extern int preserve_links;
  48 extern int preserve_hard_links;
  49 extern int preserve_perms;
  50 extern int preserve_devices;
  51 extern int preserve_specials;
  52 extern int preserve_uid;
  53 extern int preserve_gid;
  54 extern int relative_paths;
  55 extern int implied_dirs;
  56 extern int prune_empty_dirs;
  57 extern int copy_links;
  58 extern int copy_unsafe_links;
  59 extern int protocol_version;
  60 extern int sanitize_paths;
  61 extern const char *io_write_phase;
  62 extern struct stats stats;
  63 extern struct file_list *the_file_list;
  64
  65 extern char curr_dir[MAXPATHLEN];
  66
  67 extern struct chmod_mode_struct *chmod_modes;
  68
  69 extern struct filter_list_struct filter_list;
  70 extern struct filter_list_struct server_filter_list;
  71
  72 int io_error;
  73 int checksum_len;
  74 dev_t filesystem_dev; /* used to implement -x */
  75 unsigned int file_struct_len;
  76
  77 static char empty_sum[MD4_SUM_LENGTH];
  78 static int flist_count_offset;
  79
  80 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  81 static void output_flist(struct file_list *flist);
  82
  83 void init_flist(void)
  84 {
  85         struct file_struct f;
  86
  87         /* Figure out how big the file_struct is without trailing padding */
  88         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  89         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
  90 }
  91
  92 static int show_filelist_p(void)
  93 {
  94         return verbose && xfer_dirs && !am_server;
  95 }
  96
  97 static void start_filelist_progress(char *kind)
  98 {
  99         rprintf(FINFO, "%s ... ", kind);
 100         if (verbose > 1 || do_progress)
 101                 rprintf(FINFO, "\n");
 102         rflush(FINFO);
 103 }
 104
 105 static void emit_filelist_progress(int count)
 106 {
 107         rprintf(FINFO, " %d files...\r", count);
 108 }
 109
 110 static void maybe_emit_filelist_progress(int count)
 111 {
 112         if (do_progress && show_filelist_p() && (count % 100) == 0)
 113                 emit_filelist_progress(count);
 114 }
 115
 116 static void finish_filelist_progress(const struct file_list *flist)
 117 {
 118         if (do_progress) {
 119                 /* This overwrites the progress line */
 120                 rprintf(FINFO, "%d file%sto consider\n",
 121                         flist->count, flist->count == 1 ? " " : "s ");
 122         } else
 123                 rprintf(FINFO, "done\n");
 124 }
 125
 126 void show_flist_stats(void)
 127 {
 128         /* Nothing yet */
 129 }
 130
 131 static void list_file_entry(struct file_struct *f)
 132 {
 133         char permbuf[PERMSTRING_SIZE];
 134
 135         if (!f->basename) {
 136                 /* this can happen if duplicate names were removed */
 137                 return;
 138         }
 139
 140         permstring(permbuf, f->mode);
 141
 142 #ifdef SUPPORT_LINKS
 143         if (preserve_links && S_ISLNK(f->mode)) {
 144                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 145                         permbuf,
 146                         (double)f->length, timestring(f->modtime),
 147                         f_name(f, NULL), f->u.link);
 148         } else
 149 #endif
 150         {
 151                 rprintf(FINFO, "%s %11.0f %s %s\n",
 152                         permbuf,
 153                         (double)f->length, timestring(f->modtime),
 154                         f_name(f, NULL));
 155         }
 156 }
 157
 158 /**
 159  * Stat either a symlink or its referent, depending on the settings of
 160  * copy_links, copy_unsafe_links, etc.
 161  *
 162  * @retval -1 on error
 163  *
 164  * @retval 0 for success
 165  *
 166  * @post If @p path is a symlink, then @p linkbuf (of size @c
 167  * MAXPATHLEN) contains the symlink target.
 168  *
 169  * @post @p buffer contains information about the link or the
 170  * referrent as appropriate, if they exist.
 171  **/
 172 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 173 {
 174 #ifdef SUPPORT_LINKS
 175         if (copy_links)
 176                 return do_stat(path, buffer);
 177         if (link_stat(path, buffer, 0) < 0)
 178                 return -1;
 179         if (S_ISLNK(buffer->st_mode)) {
 180                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 181                 if (l == -1)
 182                         return -1;
 183                 linkbuf[l] = 0;
 184                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 185                         if (verbose > 1) {
 186                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 187                                         path, linkbuf);
 188                         }
 189                         return do_stat(path, buffer);
 190                 }
 191         }
 192         return 0;
 193 #else
 194         return do_stat(path, buffer);
 195 #endif
 196 }
 197
 198 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 199 {
 200 #ifdef SUPPORT_LINKS
 201         if (copy_links)
 202                 return do_stat(path, buffer);
 203         if (do_lstat(path, buffer) < 0)
 204                 return -1;
 205         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 206                 STRUCT_STAT st;
 207                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 208                         *buffer = st;
 209         }
 210         return 0;
 211 #else
 212         return do_stat(path, buffer);
 213 #endif
 214 }
 215
 216 /* This function is used to check if a file should be included/excluded
 217  * from the list of files based on its name and type etc.  The value of
 218  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 219 static int is_excluded(char *fname, int is_dir, int filter_level)
 220 {
 221 #if 0 /* This currently never happens, so avoid a useless compare. */
 222         if (filter_level == NO_FILTERS)
 223                 return 0;
 224 #endif
 225         if (fname) {
 226                 /* never exclude '.', even if somebody does --exclude '*' */
 227                 if (fname[0] == '.' && !fname[1])
 228                         return 0;
 229                 /* Handle the -R version of the '.' dir. */
 230                 if (fname[0] == '/') {
 231                         int len = strlen(fname);
 232                         if (fname[len-1] == '.' && fname[len-2] == '/')
 233                                 return 0;
 234                 }
 235         }
 236         if (server_filter_list.head
 237             && check_filter(&server_filter_list, fname, is_dir) < 0)
 238                 return 1;
 239         if (filter_level != ALL_FILTERS)
 240                 return 0;
 241         if (filter_list.head
 242             && check_filter(&filter_list, fname, is_dir) < 0)
 243                 return 1;
 244         return 0;
 245 }
 246
 247 static int to_wire_mode(mode_t mode)
 248 {
 249 #ifdef SUPPORT_LINKS
 250         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 251                 return (mode & ~(_S_IFMT)) | 0120000;
 252 #endif
 253         return (int)mode;
 254 }
 255
 256 static mode_t from_wire_mode(int mode)
 257 {
 258         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 259                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 260         return (mode_t)mode;
 261 }
 262
 263 static void send_directory(int f, struct file_list *flist,
 264                            char *fbuf, int len);
 265
 266 static char *flist_dir;
 267 static int flist_dir_len;
 268
 269
 270 /**
 271  * Make sure @p flist is big enough to hold at least @p flist->count
 272  * entries.
 273  **/
 274 void flist_expand(struct file_list *flist)
 275 {
 276         struct file_struct **new_ptr;
 277
 278         if (flist->count < flist->malloced)
 279                 return;
 280
 281         if (flist->malloced < FLIST_START)
 282                 flist->malloced = FLIST_START;
 283         else if (flist->malloced >= FLIST_LINEAR)
 284                 flist->malloced += FLIST_LINEAR;
 285         else
 286                 flist->malloced *= 2;
 287
 288         /*
 289          * In case count jumped or we are starting the list
 290          * with a known size just set it.
 291          */
 292         if (flist->malloced < flist->count)
 293                 flist->malloced = flist->count;
 294
 295         new_ptr = realloc_array(flist->files, struct file_struct *,
 296                                 flist->malloced);
 297
 298         if (verbose >= 2 && flist->malloced != FLIST_START) {
 299                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 300                     who_am_i(),
 301                     (double)sizeof flist->files[0] * flist->malloced,
 302                     (new_ptr == flist->files) ? " not" : "");
 303         }
 304
 305         flist->files = new_ptr;
 306
 307         if (!flist->files)
 308                 out_of_memory("flist_expand");
 309 }
 310
 311 static void send_file_entry(struct file_struct *file, int f)
 312 {
 313         unsigned short flags;
 314         static time_t modtime;
 315         static mode_t mode;
 316         static int64 dev;
 317         static dev_t rdev;
 318         static uint32 rdev_major;
 319         static uid_t uid;
 320         static gid_t gid;
 321         static char lastname[MAXPATHLEN];
 322         char fname[MAXPATHLEN];
 323         int l1, l2;
 324
 325         if (f < 0)
 326                 return;
 327
 328         if (!file) {
 329                 write_byte(f, 0);
 330                 modtime = 0, mode = 0;
 331                 dev = 0, rdev = makedev(0, 0);
 332                 rdev_major = 0;
 333                 uid = 0, gid = 0;
 334                 *lastname = '\0';
 335                 return;
 336         }
 337
 338         io_write_phase = "send_file_entry";
 339
 340         f_name(file, fname);
 341
 342         flags = file->flags & XMIT_TOP_DIR;
 343
 344         if (file->mode == mode)
 345                 flags |= XMIT_SAME_MODE;
 346         else
 347                 mode = file->mode;
 348         if ((preserve_devices && IS_DEVICE(mode))
 349          || (preserve_specials && IS_SPECIAL(mode))) {
 350                 if (protocol_version < 28) {
 351                         if (file->u.rdev == rdev)
 352                                 flags |= XMIT_SAME_RDEV_pre28;
 353                         else
 354                                 rdev = file->u.rdev;
 355                 } else {
 356                         rdev = file->u.rdev;
 357                         if ((uint32)major(rdev) == rdev_major)
 358                                 flags |= XMIT_SAME_RDEV_MAJOR;
 359                         else
 360                                 rdev_major = major(rdev);
 361                         if ((uint32)minor(rdev) <= 0xFFu)
 362                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 363                 }
 364         } else if (protocol_version < 28)
 365                 rdev = makedev(0, 0);
 366         if (file->uid == uid)
 367                 flags |= XMIT_SAME_UID;
 368         else
 369                 uid = file->uid;
 370         if (file->gid == gid)
 371                 flags |= XMIT_SAME_GID;
 372         else
 373                 gid = file->gid;
 374         if (file->modtime == modtime)
 375                 flags |= XMIT_SAME_TIME;
 376         else
 377                 modtime = file->modtime;
 378
 379 #ifdef SUPPORT_HARD_LINKS
 380         if (file->link_u.idev) {
 381                 if (file->F_DEV == dev) {
 382                         if (protocol_version >= 28)
 383                                 flags |= XMIT_SAME_DEV;
 384                 } else
 385                         dev = file->F_DEV;
 386                 flags |= XMIT_HAS_IDEV_DATA;
 387         }
 388 #endif
 389
 390         for (l1 = 0;
 391             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 392             l1++) {}
 393         l2 = strlen(fname+l1);
 394
 395         if (l1 > 0)
 396                 flags |= XMIT_SAME_NAME;
 397         if (l2 > 255)
 398                 flags |= XMIT_LONG_NAME;
 399
 400         /* We must make sure we don't send a zero flag byte or the
 401          * other end will terminate the flist transfer.  Note that
 402          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 403          * it's harmless way to add a bit to the first flag byte. */
 404         if (protocol_version >= 28) {
 405                 if (!flags && !S_ISDIR(mode))
 406                         flags |= XMIT_TOP_DIR;
 407                 if ((flags & 0xFF00) || !flags) {
 408                         flags |= XMIT_EXTENDED_FLAGS;
 409                         write_byte(f, flags);
 410                         write_byte(f, flags >> 8);
 411                 } else
 412                         write_byte(f, flags);
 413         } else {
 414                 if (!(flags & 0xFF))
 415                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 416                 write_byte(f, flags);
 417         }
 418         if (flags & XMIT_SAME_NAME)
 419                 write_byte(f, l1);
 420         if (flags & XMIT_LONG_NAME)
 421                 write_int(f, l2);
 422         else
 423                 write_byte(f, l2);
 424         write_buf(f, fname + l1, l2);
 425
 426         write_longint(f, file->length);
 427         if (!(flags & XMIT_SAME_TIME))
 428                 write_int(f, modtime);
 429         if (!(flags & XMIT_SAME_MODE))
 430                 write_int(f, to_wire_mode(mode));
 431         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 432                 if (!numeric_ids)
 433                         add_uid(uid);
 434                 write_int(f, uid);
 435         }
 436         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 437                 if (!numeric_ids)
 438                         add_gid(gid);
 439                 write_int(f, gid);
 440         }
 441         if ((preserve_devices && IS_DEVICE(mode))
 442          || (preserve_specials && IS_SPECIAL(mode))) {
 443                 if (protocol_version < 28) {
 444                         if (!(flags & XMIT_SAME_RDEV_pre28))
 445                                 write_int(f, (int)rdev);
 446                 } else {
 447                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 448                                 write_int(f, major(rdev));
 449                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 450                                 write_byte(f, minor(rdev));
 451                         else
 452                                 write_int(f, minor(rdev));
 453                 }
 454         }
 455
 456 #ifdef SUPPORT_LINKS
 457         if (preserve_links && S_ISLNK(mode)) {
 458                 int len = strlen(file->u.link);
 459                 write_int(f, len);
 460                 write_buf(f, file->u.link, len);
 461         }
 462 #endif
 463
 464 #ifdef SUPPORT_HARD_LINKS
 465         if (flags & XMIT_HAS_IDEV_DATA) {
 466                 if (protocol_version < 26) {
 467                         /* 32-bit dev_t and ino_t */
 468                         write_int(f, dev);
 469                         write_int(f, file->F_INODE);
 470                 } else {
 471                         /* 64-bit dev_t and ino_t */
 472                         if (!(flags & XMIT_SAME_DEV))
 473                                 write_longint(f, dev);
 474                         write_longint(f, file->F_INODE);
 475                 }
 476         }
 477 #endif
 478
 479         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 480                 char *sum;
 481                 if (S_ISREG(mode))
 482                         sum = file->u.sum;
 483                 else {
 484                         /* Prior to 28, we sent a useless set of nulls. */
 485                         sum = empty_sum;
 486                 }
 487                 write_buf(f, sum, checksum_len);
 488         }
 489
 490         strlcpy(lastname, fname, MAXPATHLEN);
 491
 492         io_write_phase = "unknown";
 493 }
 494
 495 static struct file_struct *receive_file_entry(struct file_list *flist,
 496                                               unsigned short flags, int f)
 497 {
 498         static time_t modtime;
 499         static mode_t mode;
 500         static int64 dev;
 501         static dev_t rdev;
 502         static uint32 rdev_major;
 503         static uid_t uid;
 504         static gid_t gid;
 505         static char lastname[MAXPATHLEN], *lastdir;
 506         static int lastdir_depth, lastdir_len = -1;
 507         static unsigned int del_hier_name_len = 0;
 508         static int in_del_hier = 0;
 509         char thisname[MAXPATHLEN];
 510         unsigned int l1 = 0, l2 = 0;
 511         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 512         OFF_T file_length;
 513         char *basename, *dirname, *bp;
 514         struct file_struct *file;
 515
 516         if (!flist) {
 517                 modtime = 0, mode = 0;
 518                 dev = 0, rdev = makedev(0, 0);
 519                 rdev_major = 0;
 520                 uid = 0, gid = 0;
 521                 *lastname = '\0';
 522                 lastdir_len = -1;
 523                 in_del_hier = 0;
 524                 return NULL;
 525         }
 526
 527         if (flags & XMIT_SAME_NAME)
 528                 l1 = read_byte(f);
 529
 530         if (flags & XMIT_LONG_NAME)
 531                 l2 = read_int(f);
 532         else
 533                 l2 = read_byte(f);
 534
 535         if (l2 >= MAXPATHLEN - l1) {
 536                 rprintf(FERROR,
 537                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 538                         flags, l1, l2, lastname);
 539                 overflow_exit("receive_file_entry");
 540         }
 541
 542         strlcpy(thisname, lastname, l1 + 1);
 543         read_sbuf(f, &thisname[l1], l2);
 544         thisname[l1 + l2] = 0;
 545
 546         strlcpy(lastname, thisname, MAXPATHLEN);
 547
 548         clean_fname(thisname, 0);
 549
 550         if (sanitize_paths)
 551                 sanitize_path(thisname, thisname, "", 0);
 552
 553         if ((basename = strrchr(thisname, '/')) != NULL) {
 554                 dirname_len = ++basename - thisname; /* counts future '\0' */
 555                 if (lastdir_len == dirname_len - 1
 556                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 557                         dirname = lastdir;
 558                         dirname_len = 0; /* indicates no copy is needed */
 559                 } else
 560                         dirname = thisname;
 561         } else {
 562                 basename = thisname;
 563                 dirname = NULL;
 564                 dirname_len = 0;
 565         }
 566         basename_len = strlen(basename) + 1; /* count the '\0' */
 567
 568         file_length = read_longint(f);
 569         if (!(flags & XMIT_SAME_TIME))
 570                 modtime = (time_t)read_int(f);
 571         if (!(flags & XMIT_SAME_MODE))
 572                 mode = from_wire_mode(read_int(f));
 573
 574         if (chmod_modes && !S_ISLNK(mode))
 575                 mode = tweak_mode(mode, chmod_modes);
 576
 577         if (preserve_uid && !(flags & XMIT_SAME_UID))
 578                 uid = (uid_t)read_int(f);
 579         if (preserve_gid && !(flags & XMIT_SAME_GID))
 580                 gid = (gid_t)read_int(f);
 581
 582         if ((preserve_devices && IS_DEVICE(mode))
 583          || (preserve_specials && IS_SPECIAL(mode))) {
 584                 if (protocol_version < 28) {
 585                         if (!(flags & XMIT_SAME_RDEV_pre28))
 586                                 rdev = (dev_t)read_int(f);
 587                 } else {
 588                         uint32 rdev_minor;
 589                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 590                                 rdev_major = read_int(f);
 591                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 592                                 rdev_minor = read_byte(f);
 593                         else
 594                                 rdev_minor = read_int(f);
 595                         rdev = makedev(rdev_major, rdev_minor);
 596                 }
 597         } else if (protocol_version < 28)
 598                 rdev = makedev(0, 0);
 599
 600 #ifdef SUPPORT_LINKS
 601         if (preserve_links && S_ISLNK(mode)) {
 602                 linkname_len = read_int(f) + 1; /* count the '\0' */
 603                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 604                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 605                                 linkname_len - 1);
 606                         overflow_exit("receive_file_entry");
 607                 }
 608         }
 609         else
 610 #endif
 611                 linkname_len = 0;
 612
 613         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 614
 615         alloc_len = file_struct_len + dirname_len + basename_len
 616                   + linkname_len + sum_len;
 617         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 618
 619         file = (struct file_struct *)bp;
 620         memset(bp, 0, file_struct_len);
 621         bp += file_struct_len;
 622
 623         file->modtime = modtime;
 624         file->length = file_length;
 625         file->mode = mode;
 626         file->uid = uid;
 627         file->gid = gid;
 628
 629         if (dirname_len) {
 630                 file->dirname = lastdir = bp;
 631                 lastdir_len = dirname_len - 1;
 632                 memcpy(bp, dirname, dirname_len - 1);
 633                 bp += dirname_len;
 634                 bp[-1] = '\0';
 635                 lastdir_depth = count_dir_elements(lastdir);
 636                 file->dir.depth = lastdir_depth + 1;
 637         } else if (dirname) {
 638                 file->dirname = dirname; /* we're reusing lastname */
 639                 file->dir.depth = lastdir_depth + 1;
 640         } else
 641                 file->dir.depth = 1;
 642
 643         if (S_ISDIR(mode)) {
 644                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 645                         file->dir.depth--;
 646                 if (flags & XMIT_TOP_DIR) {
 647                         in_del_hier = recurse;
 648                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 649                         if (relative_paths && del_hier_name_len > 2
 650                             && lastname[del_hier_name_len-1] == '.'
 651                             && lastname[del_hier_name_len-2] == '/')
 652                                 del_hier_name_len -= 2;
 653                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 654                 } else if (in_del_hier) {
 655                         if (!relative_paths || !del_hier_name_len
 656                          || (l1 >= del_hier_name_len
 657                           && lastname[del_hier_name_len] == '/'))
 658                                 file->flags |= FLAG_DEL_HERE;
 659                         else
 660                                 in_del_hier = 0;
 661                 }
 662         }
 663
 664         file->basename = bp;
 665         memcpy(bp, basename, basename_len);
 666         bp += basename_len;
 667
 668         if ((preserve_devices && IS_DEVICE(mode))
 669          || (preserve_specials && IS_SPECIAL(mode)))
 670                 file->u.rdev = rdev;
 671
 672 #ifdef SUPPORT_LINKS
 673         if (linkname_len) {
 674                 file->u.link = bp;
 675                 read_sbuf(f, bp, linkname_len - 1);
 676                 if (sanitize_paths)
 677                         sanitize_path(bp, bp, "", lastdir_depth);
 678                 bp += linkname_len;
 679         }
 680 #endif
 681
 682 #ifdef SUPPORT_HARD_LINKS
 683         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 684                 flags |= XMIT_HAS_IDEV_DATA;
 685         if (flags & XMIT_HAS_IDEV_DATA) {
 686                 int64 inode;
 687                 if (protocol_version < 26) {
 688                         dev = read_int(f);
 689                         inode = read_int(f);
 690                 } else {
 691                         if (!(flags & XMIT_SAME_DEV))
 692                                 dev = read_longint(f);
 693                         inode = read_longint(f);
 694                 }
 695                 if (flist->hlink_pool) {
 696                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 697                             struct idev, 1, "inode_table");
 698                         file->F_INODE = inode;
 699                         file->F_DEV = dev;
 700                 }
 701         }
 702 #endif
 703
 704         if (always_checksum && (sum_len || protocol_version < 28)) {
 705                 char *sum;
 706                 if (sum_len) {
 707                         file->u.sum = sum = bp;
 708                         /*bp += sum_len;*/
 709                 } else {
 710                         /* Prior to 28, we get a useless set of nulls. */
 711                         sum = empty_sum;
 712                 }
 713                 read_buf(f, sum, checksum_len);
 714         }
 715
 716         return file;
 717 }
 718
 719 /**
 720  * Create a file_struct for a named file by reading its stat()
 721  * information and performing extensive checks against global
 722  * options.
 723  *
 724  * @return the new file, or NULL if there was an error or this file
 725  * should be excluded.
 726  *
 727  * @todo There is a small optimization opportunity here to avoid
 728  * stat()ing the file in some circumstances, which has a certain cost.
 729  * We are called immediately after doing readdir(), and so we may
 730  * already know the d_type of the file.  We could for example avoid
 731  * statting directories if we're not recursing, but this is not a very
 732  * important case.  Some systems may not have d_type.
 733  **/
 734 struct file_struct *make_file(char *fname, struct file_list *flist,
 735                               STRUCT_STAT *stp, unsigned short flags,
 736                               int filter_level)
 737 {
 738         static char *lastdir;
 739         static int lastdir_len = -1;
 740         struct file_struct *file;
 741         STRUCT_STAT st;
 742         char sum[SUM_LENGTH];
 743         char thisname[MAXPATHLEN];
 744         char linkname[MAXPATHLEN];
 745         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 746         char *basename, *dirname, *bp;
 747
 748         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 749                 lastdir_len = -1;
 750
 751         if (strlcpy(thisname, fname, sizeof thisname)
 752             >= sizeof thisname - flist_dir_len) {
 753                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 754                 return NULL;
 755         }
 756         clean_fname(thisname, 0);
 757         if (sanitize_paths)
 758                 sanitize_path(thisname, thisname, "", 0);
 759
 760         memset(sum, 0, SUM_LENGTH);
 761
 762         if (stp && S_ISDIR(stp->st_mode))
 763                 st = *stp; /* Needed for "symlink/." with --relative. */
 764         else if (readlink_stat(thisname, &st, linkname) != 0) {
 765                 int save_errno = errno;
 766                 /* See if file is excluded before reporting an error. */
 767                 if (filter_level != NO_FILTERS
 768                     && is_excluded(thisname, 0, filter_level))
 769                         return NULL;
 770                 if (save_errno == ENOENT) {
 771 #ifdef SUPPORT_LINKS
 772                         /* Avoid "vanished" error if symlink points nowhere. */
 773                         if (copy_links && do_lstat(thisname, &st) == 0
 774                             && S_ISLNK(st.st_mode)) {
 775                                 io_error |= IOERR_GENERAL;
 776                                 rprintf(FERROR, "symlink has no referent: %s\n",
 777                                         full_fname(thisname));
 778                         } else
 779 #endif
 780                         {
 781                                 enum logcode c = am_daemon && protocol_version < 28
 782                                     ? FERROR : FINFO;
 783                                 io_error |= IOERR_VANISHED;
 784                                 rprintf(c, "file has vanished: %s\n",
 785                                         full_fname(thisname));
 786                         }
 787                 } else {
 788                         io_error |= IOERR_GENERAL;
 789                         rsyserr(FERROR, save_errno, "readlink %s failed",
 790                                 full_fname(thisname));
 791                 }
 792                 return NULL;
 793         }
 794
 795         /* backup.c calls us with filter_level set to NO_FILTERS. */
 796         if (filter_level == NO_FILTERS)
 797                 goto skip_filters;
 798
 799         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 800                 rprintf(FINFO, "skipping directory %s\n", thisname);
 801                 return NULL;
 802         }
 803
 804         /* We only care about directories because we need to avoid recursing
 805          * into a mount-point directory, not to avoid copying a symlinked
 806          * file if -L (or similar) was specified. */
 807         if (one_file_system && st.st_dev != filesystem_dev
 808          && S_ISDIR(st.st_mode)) {
 809                 if (one_file_system > 1) {
 810                         if (verbose > 2) {
 811                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 812                                         thisname);
 813                         }
 814                         return NULL;
 815                 }
 816                 flags |= FLAG_MOUNT_POINT;
 817         }
 818
 819         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 820                 return NULL;
 821
 822         if (lp_ignore_nonreadable(module_id)) {
 823 #ifdef SUPPORT_LINKS
 824                 if (!S_ISLNK(st.st_mode))
 825 #endif
 826                         if (access(thisname, R_OK) != 0)
 827                                 return NULL;
 828         }
 829
 830   skip_filters:
 831
 832         if (verbose > 2) {
 833                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 834                         who_am_i(), thisname, filter_level);
 835         }
 836
 837         if ((basename = strrchr(thisname, '/')) != NULL) {
 838                 dirname_len = ++basename - thisname; /* counts future '\0' */
 839                 if (lastdir_len == dirname_len - 1
 840                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 841                         dirname = lastdir;
 842                         dirname_len = 0; /* indicates no copy is needed */
 843                 } else
 844                         dirname = thisname;
 845         } else {
 846                 basename = thisname;
 847                 dirname = NULL;
 848                 dirname_len = 0;
 849         }
 850         basename_len = strlen(basename) + 1; /* count the '\0' */
 851
 852 #ifdef SUPPORT_LINKS
 853         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 854 #else
 855         linkname_len = 0;
 856 #endif
 857
 858         sum_len = always_checksum && am_sender && S_ISREG(st.st_mode)
 859                 ? MD4_SUM_LENGTH : 0;
 860
 861         alloc_len = file_struct_len + dirname_len + basename_len
 862             + linkname_len + sum_len;
 863         if (flist)
 864                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
 865         else {
 866                 if (!(bp = new_array(char, alloc_len)))
 867                         out_of_memory("make_file");
 868         }
 869
 870         file = (struct file_struct *)bp;
 871         memset(bp, 0, file_struct_len);
 872         bp += file_struct_len;
 873
 874         file->flags = flags;
 875         file->modtime = st.st_mtime;
 876         file->length = st.st_size;
 877         file->mode = st.st_mode;
 878         file->uid = st.st_uid;
 879         file->gid = st.st_gid;
 880
 881 #ifdef SUPPORT_HARD_LINKS
 882         if (flist && flist->hlink_pool) {
 883                 if (protocol_version < 28) {
 884                         if (S_ISREG(st.st_mode))
 885                                 file->link_u.idev = pool_talloc(
 886                                     flist->hlink_pool, struct idev, 1,
 887                                     "inode_table");
 888                 } else {
 889                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 890                                 file->link_u.idev = pool_talloc(
 891                                     flist->hlink_pool, struct idev, 1,
 892                                     "inode_table");
 893                 }
 894         }
 895         if (file->link_u.idev) {
 896                 file->F_DEV = st.st_dev;
 897                 file->F_INODE = st.st_ino;
 898         }
 899 #endif
 900
 901         if (dirname_len) {
 902                 file->dirname = lastdir = bp;
 903                 lastdir_len = dirname_len - 1;
 904                 memcpy(bp, dirname, dirname_len - 1);
 905                 bp += dirname_len;
 906                 bp[-1] = '\0';
 907         } else if (dirname)
 908                 file->dirname = dirname;
 909
 910         file->basename = bp;
 911         memcpy(bp, basename, basename_len);
 912         bp += basename_len;
 913
 914 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 915         if ((preserve_devices && IS_DEVICE(st.st_mode))
 916          || (preserve_specials && IS_SPECIAL(st.st_mode)))
 917                 file->u.rdev = st.st_rdev;
 918 #endif
 919
 920 #ifdef SUPPORT_LINKS
 921         if (linkname_len) {
 922                 file->u.link = bp;
 923                 memcpy(bp, linkname, linkname_len);
 924                 bp += linkname_len;
 925         }
 926 #endif
 927
 928         if (sum_len) {
 929                 file->u.sum = bp;
 930                 file_checksum(thisname, bp, st.st_size);
 931                 /*bp += sum_len;*/
 932         }
 933
 934         file->dir.root = flist_dir;
 935
 936         /* This code is only used by the receiver when it is building
 937          * a list of files for a delete pass. */
 938         if (keep_dirlinks && linkname_len && flist) {
 939                 STRUCT_STAT st2;
 940                 int save_mode = file->mode;
 941                 file->mode = S_IFDIR; /* Find a directory with our name. */
 942                 if (flist_find(the_file_list, file) >= 0
 943                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 944                         file->modtime = st2.st_mtime;
 945                         file->length = st2.st_size;
 946                         file->mode = st2.st_mode;
 947                         file->uid = st2.st_uid;
 948                         file->gid = st2.st_gid;
 949                         file->u.link = NULL;
 950                 } else
 951                         file->mode = save_mode;
 952         }
 953
 954         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 955                 stats.total_size += st.st_size;
 956
 957         return file;
 958 }
 959
 960 static struct file_struct *send_file_name(int f, struct file_list *flist,
 961                                           char *fname, STRUCT_STAT *stp,
 962                                           unsigned short flags)
 963 {
 964         struct file_struct *file;
 965
 966         file = make_file(fname, flist, stp, flags,
 967                          f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 968         if (!file)
 969                 return NULL;
 970
 971         if (chmod_modes && !S_ISLNK(file->mode))
 972                 file->mode = tweak_mode(file->mode, chmod_modes);
 973
 974         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 975
 976         flist_expand(flist);
 977
 978         if (file->basename[0]) {
 979                 flist->files[flist->count++] = file;
 980                 send_file_entry(file, f);
 981         }
 982         return file;
 983 }
 984
 985 static void send_if_directory(int f, struct file_list *flist,
 986                               struct file_struct *file,
 987                               char *fbuf, unsigned int ol)
 988 {
 989         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
 990
 991         if (S_ISDIR(file->mode)
 992             && !(file->flags & FLAG_MOUNT_POINT) && f_name(file, fbuf)) {
 993                 void *save_filters;
 994                 unsigned int len = strlen(fbuf);
 995                 if (len > 1 && fbuf[len-1] == '/')
 996                         fbuf[--len] = '\0';
 997                 if (len >= MAXPATHLEN - 1) {
 998                         io_error |= IOERR_GENERAL;
 999                         rprintf(FERROR, "skipping long-named directory: %s\n",
1000                                 full_fname(fbuf));
1001                         return;
1002                 }
1003                 save_filters = push_local_filters(fbuf, len);
1004                 send_directory(f, flist, fbuf, len);
1005                 pop_local_filters(save_filters);
1006                 fbuf[ol] = '\0';
1007                 if (is_dot_dir)
1008                         fbuf[ol-1] = '.';
1009         }
1010 }
1011
1012 /* This function is normally called by the sender, but the receiving side also
1013  * calls it from get_dirlist() with f set to -1 so that we just construct the
1014  * file list in memory without sending it over the wire.  Also, get_dirlist()
1015  * might call this with f set to -2, which also indicates that local filter
1016  * rules should be ignored. */
1017 static void send_directory(int f, struct file_list *flist,
1018                            char *fbuf, int len)
1019 {
1020         struct dirent *di;
1021         unsigned remainder;
1022         char *p;
1023         DIR *d;
1024         int start = flist->count;
1025
1026         if (!(d = opendir(fbuf))) {
1027                 io_error |= IOERR_GENERAL;
1028                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1029                 return;
1030         }
1031
1032         p = fbuf + len;
1033         if (len != 1 || *fbuf != '/')
1034                 *p++ = '/';
1035         *p = '\0';
1036         remainder = MAXPATHLEN - (p - fbuf);
1037
1038         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1039                 char *dname = d_name(di);
1040                 if (dname[0] == '.' && (dname[1] == '\0'
1041                     || (dname[1] == '.' && dname[2] == '\0')))
1042                         continue;
1043                 if (strlcpy(p, dname, remainder) >= remainder) {
1044                         io_error |= IOERR_GENERAL;
1045                         rprintf(FINFO,
1046                                 "cannot send long-named file %s\n",
1047                                 full_fname(fbuf));
1048                         continue;
1049                 }
1050
1051                 send_file_name(f, flist, fbuf, NULL, 0);
1052         }
1053
1054         fbuf[len] = '\0';
1055
1056         if (errno) {
1057                 io_error |= IOERR_GENERAL;
1058                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1059         }
1060
1061         closedir(d);
1062
1063         if (recurse) {
1064                 int i, end = flist->count - 1;
1065                 for (i = start; i <= end; i++)
1066                         send_if_directory(f, flist, flist->files[i], fbuf, len);
1067         }
1068 }
1069
1070 struct file_list *send_file_list(int f, int argc, char *argv[])
1071 {
1072         int len;
1073         STRUCT_STAT st;
1074         char *p, *dir, olddir[sizeof curr_dir];
1075         char lastpath[MAXPATHLEN] = "";
1076         struct file_list *flist;
1077         struct timeval start_tv, end_tv;
1078         int64 start_write;
1079         int use_ff_fd = 0;
1080
1081         if (show_filelist_p())
1082                 start_filelist_progress("building file list");
1083
1084         start_write = stats.total_written;
1085         gettimeofday(&start_tv, NULL);
1086
1087         flist = flist_new(WITH_HLINK, "send_file_list");
1088
1089         io_start_buffering_out();
1090         if (filesfrom_fd >= 0) {
1091                 if (argv[0] && !push_dir(argv[0])) {
1092                         rsyserr(FERROR, errno, "push_dir %s failed",
1093                                 full_fname(argv[0]));
1094                         exit_cleanup(RERR_FILESELECT);
1095                 }
1096                 use_ff_fd = 1;
1097         }
1098
1099         while (1) {
1100                 char fbuf[MAXPATHLEN];
1101                 char *fn;
1102                 int is_dot_dir;
1103
1104                 if (use_ff_fd) {
1105                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1106                                 break;
1107                         sanitize_path(fbuf, fbuf, "", 0);
1108                 } else {
1109                         if (argc-- == 0)
1110                                 break;
1111                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1112                         if (sanitize_paths)
1113                                 sanitize_path(fbuf, fbuf, "", 0);
1114                 }
1115
1116                 len = strlen(fbuf);
1117                 if (relative_paths) {
1118                         /* We clean up fbuf below. */
1119                         is_dot_dir = 0;
1120                 } else if (!len || fbuf[len - 1] == '/') {
1121                         if (len == 2 && fbuf[0] == '.') {
1122                                 /* Turn "./" into just "." rather than "./." */
1123                                 fbuf[1] = '\0';
1124                         } else {
1125                                 if (len + 1 >= MAXPATHLEN)
1126                                         overflow_exit("send_file_list");
1127                                 fbuf[len++] = '.';
1128                                 fbuf[len] = '\0';
1129                         }
1130                         is_dot_dir = 1;
1131                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1132                     && (len == 2 || fbuf[len-3] == '/')) {
1133                         if (len + 2 >= MAXPATHLEN)
1134                                 overflow_exit("send_file_list");
1135                         fbuf[len++] = '/';
1136                         fbuf[len++] = '.';
1137                         fbuf[len] = '\0';
1138                         is_dot_dir = 1;
1139                 } else {
1140                         is_dot_dir = fbuf[len-1] == '.'
1141                                    && (len == 1 || fbuf[len-2] == '/');
1142                 }
1143
1144                 if (link_stat(fbuf, &st, keep_dirlinks) != 0) {
1145                         io_error |= IOERR_GENERAL;
1146                         rsyserr(FERROR, errno, "link_stat %s failed",
1147                                 full_fname(fbuf));
1148                         continue;
1149                 }
1150
1151                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1152                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1153                         continue;
1154                 }
1155
1156                 dir = NULL;
1157                 olddir[0] = '\0';
1158
1159                 if (!relative_paths) {
1160                         p = strrchr(fbuf, '/');
1161                         if (p) {
1162                                 *p = '\0';
1163                                 if (p == fbuf)
1164                                         dir = "/";
1165                                 else
1166                                         dir = fbuf;
1167                                 len -= p - fbuf + 1;
1168                                 fn = p + 1;
1169                         } else
1170                                 fn = fbuf;
1171                 } else {
1172                         if ((p = strstr(fbuf, "/./")) != NULL) {
1173                                 *p = '\0';
1174                                 if (p == fbuf)
1175                                         dir = "/";
1176                                 else
1177                                         dir = fbuf;
1178                                 len -= p - fbuf + 3;
1179                                 fn = p + 3;
1180                         } else
1181                                 fn = fbuf;
1182                         /* Get rid of trailing "/" and "/.". */
1183                         while (len) {
1184                                 if (fn[len - 1] == '/') {
1185                                         is_dot_dir = 1;
1186                                         if (!--len && !dir) {
1187                                                 len++;
1188                                                 break;
1189                                         }
1190                                 }
1191                                 else if (len >= 2 && fn[len - 1] == '.'
1192                                                   && fn[len - 2] == '/') {
1193                                         is_dot_dir = 1;
1194                                         if (!(len -= 2) && !dir) {
1195                                                 len++;
1196                                                 break;
1197                                         }
1198                                 } else
1199                                         break;
1200                         }
1201                         fn[len] = '\0';
1202                         /* Reject a ".." dir in the active part of the path. */
1203                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1204                                 if ((p[2] == '/' || p[2] == '\0')
1205                                  && (p == fn || p[-1] == '/')) {
1206                                         rprintf(FERROR,
1207                                             "found \"..\" dir in relative path: %s\n",
1208                                             fbuf);
1209                                         exit_cleanup(RERR_SYNTAX);
1210                                 }
1211                         }
1212                 }
1213
1214                 if (!*fn) {
1215                         len = 1;
1216                         fn = ".";
1217                 }
1218
1219                 if (dir && *dir) {
1220                         static char *lastdir;
1221                         static int lastdir_len;
1222
1223                         strlcpy(olddir, curr_dir, sizeof olddir);
1224
1225                         if (!push_dir(dir)) {
1226                                 io_error |= IOERR_GENERAL;
1227                                 rsyserr(FERROR, errno, "push_dir %s failed",
1228                                         full_fname(dir));
1229                                 continue;
1230                         }
1231
1232                         if (lastdir && strcmp(lastdir, dir) == 0) {
1233                                 flist_dir = lastdir;
1234                                 flist_dir_len = lastdir_len;
1235                         } else {
1236                                 flist_dir = lastdir = strdup(dir);
1237                                 flist_dir_len = lastdir_len = strlen(dir);
1238                         }
1239                 }
1240
1241                 if (fn != fbuf)
1242                         memmove(fbuf, fn, len + 1);
1243
1244                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1245                         /* Send the implied directories at the start of the
1246                          * source spec, so we get their permissions right. */
1247                         char *lp = lastpath, *slash = fbuf;
1248                         *p = '\0';
1249                         /* Skip any initial directories in our path that we
1250                          * have in common with lastpath. */
1251                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1252                                 if (*fn == '/')
1253                                         slash = fn;
1254                         }
1255                         *p = '/';
1256                         if (fn != p || (*lp && *lp != '/')) {
1257                                 int save_copy_links = copy_links;
1258                                 int save_xfer_dirs = xfer_dirs;
1259                                 copy_links = copy_unsafe_links;
1260                                 xfer_dirs = 1;
1261                                 while ((slash = strchr(slash+1, '/')) != 0) {
1262                                         *slash = '\0';
1263                                         send_file_name(f, flist, fbuf, NULL, 0);
1264                                         *slash = '/';
1265                                 }
1266                                 copy_links = save_copy_links;
1267                                 xfer_dirs = save_xfer_dirs;
1268                                 *p = '\0';
1269                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1270                                 *p = '/';
1271                         }
1272                 }
1273
1274                 if (one_file_system)
1275                         filesystem_dev = st.st_dev;
1276
1277                 if (recurse || (xfer_dirs && is_dot_dir)) {
1278                         struct file_struct *file;
1279                         file = send_file_name(f, flist, fbuf, &st, FLAG_TOP_DIR);
1280                         if (file)
1281                                 send_if_directory(f, flist, file, fbuf, len);
1282                 } else
1283                         send_file_name(f, flist, fbuf, &st, 0);
1284
1285                 if (olddir[0]) {
1286                         flist_dir = NULL;
1287                         flist_dir_len = 0;
1288                         if (!pop_dir(olddir)) {
1289                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1290                                         full_fname(olddir));
1291                                 exit_cleanup(RERR_FILESELECT);
1292                         }
1293                 }
1294         }
1295
1296         gettimeofday(&end_tv, NULL);
1297         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1298                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1299         if (stats.flist_buildtime == 0)
1300                 stats.flist_buildtime = 1;
1301         start_tv = end_tv;
1302
1303         send_file_entry(NULL, f);
1304
1305         if (show_filelist_p())
1306                 finish_filelist_progress(flist);
1307
1308         gettimeofday(&end_tv, NULL);
1309         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1310                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1311
1312         if (flist->hlink_pool) {
1313                 pool_destroy(flist->hlink_pool);
1314                 flist->hlink_pool = NULL;
1315         }
1316
1317         /* Sort the list without removing any duplicates.  This allows the
1318          * receiving side to ask for any name they like, which gives us the
1319          * flexibility to change the way we unduplicate names in the future
1320          * without causing a compatibility problem with older versions. */
1321         clean_flist(flist, 0, 0);
1322
1323         send_uid_list(f);
1324
1325         /* send the io_error flag */
1326         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1327
1328         io_end_buffering();
1329         stats.flist_size = stats.total_written - start_write;
1330         stats.num_files = flist->count;
1331
1332         if (verbose > 3)
1333                 output_flist(flist);
1334
1335         if (verbose > 2)
1336                 rprintf(FINFO, "send_file_list done\n");
1337
1338         return flist;
1339 }
1340
1341 struct file_list *recv_file_list(int f)
1342 {
1343         struct file_list *flist;
1344         unsigned short flags;
1345         int64 start_read;
1346
1347         if (show_filelist_p())
1348                 start_filelist_progress("receiving file list");
1349
1350         start_read = stats.total_read;
1351
1352         flist = flist_new(WITH_HLINK, "recv_file_list");
1353
1354         flist->count = 0;
1355         flist->malloced = 1000;
1356         flist->files = new_array(struct file_struct *, flist->malloced);
1357         if (!flist->files)
1358                 goto oom;
1359
1360         while ((flags = read_byte(f)) != 0) {
1361                 struct file_struct *file;
1362
1363                 flist_expand(flist);
1364
1365                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1366                         flags |= read_byte(f) << 8;
1367                 file = receive_file_entry(flist, flags, f);
1368
1369                 if (S_ISREG(file->mode))
1370                         stats.total_size += file->length;
1371
1372                 flist->files[flist->count++] = file;
1373
1374                 maybe_emit_filelist_progress(flist->count);
1375
1376                 if (verbose > 2) {
1377                         rprintf(FINFO, "recv_file_name(%s)\n",
1378                                 f_name(file, NULL));
1379                 }
1380         }
1381         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1382
1383         if (verbose > 2)
1384                 rprintf(FINFO, "received %d names\n", flist->count);
1385
1386         if (show_filelist_p())
1387                 finish_filelist_progress(flist);
1388
1389         clean_flist(flist, relative_paths, 1);
1390
1391         if (f >= 0) {
1392                 recv_uid_list(f, flist);
1393
1394                 /* Recv the io_error flag */
1395                 if (lp_ignore_errors(module_id) || ignore_errors)
1396                         read_int(f);
1397                 else
1398                         io_error |= read_int(f);
1399         }
1400
1401         if (verbose > 3)
1402                 output_flist(flist);
1403
1404         if (list_only) {
1405                 int i;
1406                 for (i = 0; i < flist->count; i++)
1407                         list_file_entry(flist->files[i]);
1408         }
1409
1410         if (verbose > 2)
1411                 rprintf(FINFO, "recv_file_list done\n");
1412
1413         stats.flist_size = stats.total_read - start_read;
1414         stats.num_files = flist->count;
1415
1416         return flist;
1417
1418   oom:
1419         out_of_memory("recv_file_list");
1420         return NULL;            /* not reached */
1421 }
1422
1423 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1424 {
1425         return f_name_cmp(*file1, *file2);
1426 }
1427
1428 /* Search for an identically-named item in the file list.  Note that the
1429  * items must agree in their directory-ness, or no match is returned. */
1430 int flist_find(struct file_list *flist, struct file_struct *f)
1431 {
1432         int low = flist->low, high = flist->high;
1433         int diff, mid, mid_up;
1434
1435         while (low <= high) {
1436                 mid = (low + high) / 2;
1437                 if (flist->files[mid]->basename)
1438                         mid_up = mid;
1439                 else {
1440                         /* Scan for the next non-empty entry using the cached
1441                          * distance values.  If the value isn't fully up-to-
1442                          * date, update it. */
1443                         mid_up = mid + flist->files[mid]->dir.depth;
1444                         if (!flist->files[mid_up]->basename) {
1445                                 do {
1446                                     mid_up += flist->files[mid_up]->dir.depth;
1447                                 } while (!flist->files[mid_up]->basename);
1448                                 flist->files[mid]->dir.depth = mid_up - mid;
1449                         }
1450                         if (mid_up > high) {
1451                                 /* If there's nothing left above us, set high to
1452                                  * a non-empty entry below us and continue. */
1453                                 high = mid - flist->files[mid]->length;
1454                                 if (!flist->files[high]->basename) {
1455                                         do {
1456                                             high -= flist->files[high]->length;
1457                                         } while (!flist->files[high]->basename);
1458                                         flist->files[mid]->length = mid - high;
1459                                 }
1460                                 continue;
1461                         }
1462                 }
1463                 diff = f_name_cmp(flist->files[mid_up], f);
1464                 if (diff == 0) {
1465                         if (protocol_version < 29
1466                             && S_ISDIR(flist->files[mid_up]->mode)
1467                             != S_ISDIR(f->mode))
1468                                 return -1;
1469                         return mid_up;
1470                 }
1471                 if (diff < 0)
1472                         low = mid_up + 1;
1473                 else
1474                         high = mid - 1;
1475         }
1476         return -1;
1477 }
1478
1479 /*
1480  * Free up any resources a file_struct has allocated
1481  * and clear the file.
1482  */
1483 void clear_file(struct file_struct *file, struct file_list *flist)
1484 {
1485         if (flist->hlink_pool && file->link_u.idev)
1486                 pool_free(flist->hlink_pool, 0, file->link_u.idev);
1487         memset(file, 0, file_struct_len);
1488         /* In an empty entry, dir.depth is an offset to the next non-empty
1489          * entry.  Likewise for length in the opposite direction.  We assume
1490          * that we're alone for now since flist_find() will collate adjacent
1491          * items for any entries that are encountered during the find. */
1492         file->length = file->dir.depth = 1;
1493 }
1494
1495 /*
1496  * allocate a new file list
1497  */
1498 struct file_list *flist_new(int with_hlink, char *msg)
1499 {
1500         struct file_list *flist;
1501
1502         flist = new(struct file_list);
1503         if (!flist)
1504                 out_of_memory(msg);
1505
1506         memset(flist, 0, sizeof (struct file_list));
1507
1508         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1509             out_of_memory, POOL_INTERN)))
1510                 out_of_memory(msg);
1511
1512 #ifdef SUPPORT_HARD_LINKS
1513         if (with_hlink && preserve_hard_links) {
1514                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1515                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1516                         out_of_memory(msg);
1517         }
1518 #endif
1519
1520         return flist;
1521 }
1522
1523 /*
1524  * free up all elements in a flist
1525  */
1526 void flist_free(struct file_list *flist)
1527 {
1528         pool_destroy(flist->file_pool);
1529         pool_destroy(flist->hlink_pool);
1530         free(flist->files);
1531         free(flist);
1532 }
1533
1534 /*
1535  * This routine ensures we don't have any duplicate names in our file list.
1536  * duplicate names can cause corruption because of the pipelining
1537  */
1538 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1539 {
1540         char fbuf[MAXPATHLEN];
1541         int i, prev_i = 0;
1542
1543         if (!flist)
1544                 return;
1545         if (flist->count == 0) {
1546                 flist->high = -1;
1547                 return;
1548         }
1549
1550         qsort(flist->files, flist->count,
1551             sizeof flist->files[0], (int (*)())file_compare);
1552
1553         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1554                 if (flist->files[i]->basename) {
1555                         prev_i = i;
1556                         break;
1557                 }
1558         }
1559         flist->low = prev_i;
1560         while (++i < flist->count) {
1561                 int j;
1562                 struct file_struct *file = flist->files[i];
1563
1564                 if (!file->basename)
1565                         continue;
1566                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1567                         j = prev_i;
1568                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1569                         int save_mode = file->mode;
1570                         /* Make sure that this directory doesn't duplicate a
1571                          * non-directory earlier in the list. */
1572                         flist->high = prev_i;
1573                         file->mode = S_IFREG;
1574                         j = flist_find(flist, file);
1575                         file->mode = save_mode;
1576                 } else
1577                         j = -1;
1578                 if (j >= 0) {
1579                         struct file_struct *fp = flist->files[j];
1580                         int keep, drop;
1581                         /* If one is a dir and the other is not, we want to
1582                          * keep the dir because it might have contents in the
1583                          * list. */
1584                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1585                                 if (S_ISDIR(file->mode))
1586                                         keep = i, drop = j;
1587                                 else
1588                                         keep = j, drop = i;
1589                         } else
1590                                 keep = j, drop = i;
1591                         if (verbose > 1 && !am_server) {
1592                                 rprintf(FINFO,
1593                                         "removing duplicate name %s from file list (%d)\n",
1594                                         f_name(file, fbuf), drop);
1595                         }
1596                         /* Make sure we don't lose track of a user-specified
1597                          * top directory. */
1598                         flist->files[keep]->flags |= flist->files[drop]->flags
1599                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1600
1601                         clear_file(flist->files[drop], flist);
1602
1603                         if (keep == i) {
1604                                 if (flist->low == drop) {
1605                                         for (j = drop + 1;
1606                                              j < i && !flist->files[j]->basename;
1607                                              j++) {}
1608                                         flist->low = j;
1609                                 }
1610                                 prev_i = i;
1611                         }
1612                 } else
1613                         prev_i = i;
1614         }
1615         flist->high = no_dups ? prev_i : flist->count - 1;
1616
1617         if (strip_root) {
1618                 /* We need to strip off the leading slashes for relative
1619                  * paths, but this must be done _after_ the sorting phase. */
1620                 for (i = flist->low; i <= flist->high; i++) {
1621                         struct file_struct *file = flist->files[i];
1622
1623                         if (!file->dirname)
1624                                 continue;
1625                         while (*file->dirname == '/')
1626                                 file->dirname++;
1627                         if (!*file->dirname)
1628                                 file->dirname = NULL;
1629                 }
1630         }
1631
1632         if (prune_empty_dirs && no_dups) {
1633                 int j, prev_depth = 0;
1634
1635                 prev_i = 0; /* It's OK that this isn't really true. */
1636
1637                 for (i = flist->low; i <= flist->high; i++) {
1638                         struct file_struct *fp, *file = flist->files[i];
1639
1640                         /* This temporarily abuses the dir.depth value for a
1641                          * directory that is in a chain that might get pruned.
1642                          * We restore the old value if it gets a reprieve. */
1643                         if (S_ISDIR(file->mode) && file->dir.depth) {
1644                                 /* Dump empty dirs when coming back down. */
1645                                 for (j = prev_depth; j >= file->dir.depth; j--) {
1646                                         fp = flist->files[prev_i];
1647                                         if (fp->dir.depth >= 0)
1648                                                 break;
1649                                         prev_i = -fp->dir.depth-1;
1650                                         clear_file(fp, flist);
1651                                 }
1652                                 prev_depth = file->dir.depth;
1653                                 if (is_excluded(f_name(file, fbuf), 1,
1654                                                        ALL_FILTERS)) {
1655                                         /* Keep dirs through this dir. */
1656                                         for (j = prev_depth-1; ; j--) {
1657                                                 fp = flist->files[prev_i];
1658                                                 if (fp->dir.depth >= 0)
1659                                                         break;
1660                                                 prev_i = -fp->dir.depth-1;
1661                                                 fp->dir.depth = j;
1662                                         }
1663                                 } else
1664                                         file->dir.depth = -prev_i-1;
1665                                 prev_i = i;
1666                         } else {
1667                                 /* Keep dirs through this non-dir. */
1668                                 for (j = prev_depth; ; j--) {
1669                                         fp = flist->files[prev_i];
1670                                         if (fp->dir.depth >= 0)
1671                                                 break;
1672                                         prev_i = -fp->dir.depth-1;
1673                                         fp->dir.depth = j;
1674                                 }
1675                         }
1676                 }
1677                 /* Dump empty all remaining empty dirs. */
1678                 while (1) {
1679                         struct file_struct *fp = flist->files[prev_i];
1680                         if (fp->dir.depth >= 0)
1681                                 break;
1682                         prev_i = -fp->dir.depth-1;
1683                         clear_file(fp, flist);
1684                 }
1685
1686                 for (i = flist->low; i <= flist->high; i++) {
1687                         if (flist->files[i]->basename)
1688                                 break;
1689                 }
1690                 flist->low = i;
1691                 for (i = flist->high; i >= flist->low; i--) {
1692                         if (flist->files[i]->basename)
1693                                 break;
1694                 }
1695                 flist->high = i;
1696         }
1697 }
1698
1699 static void output_flist(struct file_list *flist)
1700 {
1701         char uidbuf[16], gidbuf[16], depthbuf[16];
1702         struct file_struct *file;
1703         const char *who = who_am_i();
1704         int i;
1705
1706         for (i = 0; i < flist->count; i++) {
1707                 file = flist->files[i];
1708                 if ((am_root || am_sender) && preserve_uid)
1709                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1710                 else
1711                         *uidbuf = '\0';
1712                 if (preserve_gid && file->gid != GID_NONE)
1713                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1714                 else
1715                         *gidbuf = '\0';
1716                 if (!am_sender)
1717                         sprintf(depthbuf, "%d", file->dir.depth);
1718                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1719                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1720                         file->dirname ? file->dirname : "",
1721                         file->dirname ? "/" : "", NS(file->basename),
1722                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1723                         (double)file->length, uidbuf, gidbuf, file->flags);
1724         }
1725 }
1726
1727 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1728 enum fnc_type { t_PATH, t_ITEM };
1729
1730 /* Compare the names of two file_struct entities, similar to how strcmp()
1731  * would do if it were operating on the joined strings.
1732  *
1733  * Some differences beginning with protocol_version 29: (1) directory names
1734  * are compared with an assumed trailing slash so that they compare in a
1735  * way that would cause them to sort immediately prior to any content they
1736  * may have; (2) a directory of any name compares after a non-directory of
1737  * any name at the same depth; (3) a directory with name "." compares prior
1738  * to anything else.  These changes mean that a directory and a non-dir
1739  * with the same name will not compare as equal (protocol_version >= 29).
1740  *
1741  * The dirname component can be an empty string, but the basename component
1742  * cannot (and never is in the current codebase).  The basename component
1743  * may be NULL (for a removed item), in which case it is considered to be
1744  * after any existing item. */
1745 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1746 {
1747         int dif;
1748         const uchar *c1, *c2;
1749         enum fnc_state state1, state2;
1750         enum fnc_type type1, type2;
1751         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1752
1753         if (!f1 || !f1->basename) {
1754                 if (!f2 || !f2->basename)
1755                         return 0;
1756                 return -1;
1757         }
1758         if (!f2 || !f2->basename)
1759                 return 1;
1760
1761         c1 = (uchar*)f1->dirname;
1762         c2 = (uchar*)f2->dirname;
1763         if (c1 == c2)
1764                 c1 = c2 = NULL;
1765         if (!c1) {
1766                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1767                 c1 = (uchar*)f1->basename;
1768                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1769                         type1 = t_ITEM;
1770                         state1 = s_TRAILING;
1771                         c1 = (uchar*)"";
1772                 } else
1773                         state1 = s_BASE;
1774         } else if (!*c1) {
1775                 type1 = t_path;
1776                 state1 = s_SLASH;
1777                 c1 = (uchar*)"/";
1778         } else {
1779                 type1 = t_path;
1780                 state1 = s_DIR;
1781         }
1782         if (!c2) {
1783                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1784                 c2 = (uchar*)f2->basename;
1785                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1786                         type2 = t_ITEM;
1787                         state2 = s_TRAILING;
1788                         c2 = (uchar*)"";
1789                 } else
1790                         state2 = s_BASE;
1791         } else if (!*c2) {
1792                 type2 = t_path;
1793                 state2 = s_SLASH;
1794                 c2 = (uchar*)"/";
1795         } else {
1796                 type2 = t_path;
1797                 state2 = s_DIR;
1798         }
1799
1800         if (type1 != type2)
1801                 return type1 == t_PATH ? 1 : -1;
1802
1803         while (1) {
1804                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1805                         break;
1806                 if (!*c1) {
1807                         switch (state1) {
1808                         case s_DIR:
1809                                 state1 = s_SLASH;
1810                                 c1 = (uchar*)"/";
1811                                 break;
1812                         case s_SLASH:
1813                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1814                                 c1 = (uchar*)f1->basename;
1815                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1816                                         type1 = t_ITEM;
1817                                         state1 = s_TRAILING;
1818                                         c1 = (uchar*)"";
1819                                 } else
1820                                         state1 = s_BASE;
1821                                 break;
1822                         case s_BASE:
1823                                 state1 = s_TRAILING;
1824                                 if (type1 == t_PATH) {
1825                                         c1 = (uchar*)"/";
1826                                         break;
1827                                 }
1828                                 /* FALL THROUGH */
1829                         case s_TRAILING:
1830                                 type1 = t_ITEM;
1831                                 break;
1832                         }
1833                         if (*c2 && type1 != type2)
1834                                 return type1 == t_PATH ? 1 : -1;
1835                 }
1836                 if (!*c2) {
1837                         switch (state2) {
1838                         case s_DIR:
1839                                 state2 = s_SLASH;
1840                                 c2 = (uchar*)"/";
1841                                 break;
1842                         case s_SLASH:
1843                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1844                                 c2 = (uchar*)f2->basename;
1845                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1846                                         type2 = t_ITEM;
1847                                         state2 = s_TRAILING;
1848                                         c2 = (uchar*)"";
1849                                 } else
1850                                         state2 = s_BASE;
1851                                 break;
1852                         case s_BASE:
1853                                 state2 = s_TRAILING;
1854                                 if (type2 == t_PATH) {
1855                                         c2 = (uchar*)"/";
1856                                         break;
1857                                 }
1858                                 /* FALL THROUGH */
1859                         case s_TRAILING:
1860                                 if (!*c1)
1861                                         return 0;
1862                                 type2 = t_ITEM;
1863                                 break;
1864                         }
1865                         if (type1 != type2)
1866                                 return type1 == t_PATH ? 1 : -1;
1867                 }
1868         }
1869
1870         return dif;
1871 }
1872
1873 /* Return a copy of the full filename of a flist entry, using the indicated
1874  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
1875  * done because we checked the size when creating the file_struct entry.
1876  */
1877 char *f_name(struct file_struct *f, char *fbuf)
1878 {
1879         if (!f || !f->basename)
1880                 return NULL;
1881
1882         if (!fbuf) {
1883                 static char names[5][MAXPATHLEN];
1884                 static unsigned int n;
1885
1886                 n = (n + 1) % (sizeof names / sizeof names[0]);
1887
1888                 fbuf = names[n];
1889         }
1890
1891         if (f->dirname) {
1892                 int len = strlen(f->dirname);
1893                 memcpy(fbuf, f->dirname, len);
1894                 fbuf[len] = '/';
1895                 strcpy(fbuf + len + 1, f->basename);
1896         } else
1897                 strcpy(fbuf, f->basename);
1898
1899         return fbuf;
1900 }
1901
1902 /* Do a non-recursive scan of the named directory, possibly ignoring all
1903  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1904  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1905  * buffer (the functions we call will append names onto the end, but the old
1906  * dir value will be restored on exit). */
1907 struct file_list *get_dirlist(char *dirname, int dlen,
1908                               int ignore_filter_rules)
1909 {
1910         struct file_list *dirlist;
1911         char dirbuf[MAXPATHLEN];
1912         int save_recurse = recurse;
1913         int save_xfer_dirs = xfer_dirs;
1914
1915         if (dlen < 0) {
1916                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1917                 if (dlen >= MAXPATHLEN)
1918                         return NULL;
1919                 dirname = dirbuf;
1920         }
1921
1922         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1923
1924         recurse = 0;
1925         xfer_dirs = 1;
1926         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1927         xfer_dirs = save_xfer_dirs;
1928         recurse = save_recurse;
1929         if (do_progress)
1930                 flist_count_offset += dirlist->count;
1931
1932         clean_flist(dirlist, 0, 0);
1933
1934         if (verbose > 3)
1935                 output_flist(dirlist);
1936
1937         return dirlist;
1938 }