flist.c

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