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) 2002-2007 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 version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include "rsync.h"
  24 #include "rounding.h"
  25 #include "io.h"
  26
  27 extern int verbose;
  28 extern int list_only;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int am_generator;
  34 extern int inc_recurse;
  35 extern int do_progress;
  36 extern int always_checksum;
  37 extern int module_id;
  38 extern int ignore_errors;
  39 extern int numeric_ids;
  40 extern int recurse;
  41 extern int xfer_dirs;
  42 extern int filesfrom_fd;
  43 extern int one_file_system;
  44 extern int copy_dirlinks;
  45 extern int keep_dirlinks;
  46 extern int preserve_acls;
  47 extern int preserve_xattrs;
  48 extern int preserve_links;
  49 extern int preserve_hard_links;
  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 file_extra_cnt;
  57 extern int ignore_perishable;
  58 extern int non_perishable_cnt;
  59 extern int prune_empty_dirs;
  60 extern int copy_links;
  61 extern int copy_unsafe_links;
  62 extern int protocol_version;
  63 extern int sanitize_paths;
  64 extern struct stats stats;
  65
  66 extern char curr_dir[MAXPATHLEN];
  67
  68 extern struct chmod_mode_struct *chmod_modes;
  69
  70 extern struct filter_list_struct filter_list;
  71 extern struct filter_list_struct server_filter_list;
  72
  73 int io_error;
  74 int checksum_len;
  75 dev_t filesystem_dev; /* used to implement -x */
  76
  77 struct file_list *cur_flist, *first_flist, *dir_flist;
  78 int send_dir_ndx = -1, send_dir_depth = 0;
  79 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  80 int file_total = 0; /* total of all active items over all file-lists */
  81 int flist_eof = 0; /* all the file-lists are now known */
  82
  83 /* The tmp_* vars are used as a cache area by make_file() to store data
  84  * that the sender doesn't need to remember in its file list.  The data
  85  * will survive just long enough to be used by send_file_entry(). */
  86 static dev_t tmp_rdev;
  87 #ifdef SUPPORT_HARD_LINKS
  88 static int64 tmp_dev, tmp_ino;
  89 #endif
  90 static char tmp_sum[MAX_DIGEST_LEN];
  91
  92 static char empty_sum[MAX_DIGEST_LEN];
  93 static int flist_count_offset; /* for --delete --progress */
  94
  95 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  96 static void output_flist(struct file_list *flist);
  97
  98 void init_flist(void)
  99 {
 100         if (verbose > 4) {
 101                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 102                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 103         }
 104         checksum_len = protocol_version < 21 ? 2
 105                      : protocol_version < 30 ? MD4_DIGEST_LEN
 106                      : MD5_DIGEST_LEN;
 107 }
 108
 109 static int show_filelist_p(void)
 110 {
 111         return verbose && xfer_dirs && !am_server && !inc_recurse;
 112 }
 113
 114 static void start_filelist_progress(char *kind)
 115 {
 116         rprintf(FCLIENT, "%s ... ", kind);
 117         if (verbose > 1 || do_progress)
 118                 rprintf(FCLIENT, "\n");
 119         rflush(FINFO);
 120 }
 121
 122 static void emit_filelist_progress(int count)
 123 {
 124         rprintf(FCLIENT, " %d files...\r", count);
 125 }
 126
 127 static void maybe_emit_filelist_progress(int count)
 128 {
 129         if (do_progress && show_filelist_p() && (count % 100) == 0)
 130                 emit_filelist_progress(count);
 131 }
 132
 133 static void finish_filelist_progress(const struct file_list *flist)
 134 {
 135         if (do_progress) {
 136                 /* This overwrites the progress line */
 137                 rprintf(FINFO, "%d file%sto consider\n",
 138                         flist->count, flist->count == 1 ? " " : "s ");
 139         } else
 140                 rprintf(FINFO, "done\n");
 141 }
 142
 143 void show_flist_stats(void)
 144 {
 145         /* Nothing yet */
 146 }
 147
 148 static void list_file_entry(struct file_struct *f)
 149 {
 150         char permbuf[PERMSTRING_SIZE];
 151         double len;
 152
 153         if (!F_IS_ACTIVE(f)) {
 154                 /* this can happen if duplicate names were removed */
 155                 return;
 156         }
 157
 158         permstring(permbuf, f->mode);
 159         len = F_LENGTH(f);
 160
 161         /* TODO: indicate '+' if the entry has an ACL. */
 162
 163 #ifdef SUPPORT_LINKS
 164         if (preserve_links && S_ISLNK(f->mode)) {
 165                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 166                         permbuf, len, timestring(f->modtime),
 167                         f_name(f, NULL), F_SYMLINK(f));
 168         } else
 169 #endif
 170         {
 171                 rprintf(FINFO, "%s %11.0f %s %s\n",
 172                         permbuf, len, timestring(f->modtime),
 173                         f_name(f, NULL));
 174         }
 175 }
 176
 177 /* Stat either a symlink or its referent, depending on the settings of
 178  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 179  *
 180  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 181  * MAXPATHLEN chars) will be set to the symlink's target string.
 182  *
 183  * The stat structure pointed to by stp will contain information about the
 184  * link or the referent as appropriate, if they exist. */
 185 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 186 {
 187 #ifdef SUPPORT_LINKS
 188         if (link_stat(path, stp, copy_dirlinks) < 0)
 189                 return -1;
 190         if (S_ISLNK(stp->st_mode)) {
 191                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 192                 if (llen < 0)
 193                         return -1;
 194                 linkbuf[llen] = '\0';
 195                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 196                         if (verbose > 1) {
 197                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 198                                         path, linkbuf);
 199                         }
 200                         return x_stat(path, stp, NULL);
 201                 }
 202         }
 203         return 0;
 204 #else
 205         return x_stat(path, stp, NULL);
 206 #endif
 207 }
 208
 209 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 210 {
 211 #ifdef SUPPORT_LINKS
 212         if (copy_links)
 213                 return x_stat(path, stp, NULL);
 214         if (x_lstat(path, stp, NULL) < 0)
 215                 return -1;
 216         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 217                 STRUCT_STAT st;
 218                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 219                         *stp = st;
 220         }
 221         return 0;
 222 #else
 223         return x_stat(path, stp, NULL);
 224 #endif
 225 }
 226
 227 /* This function is used to check if a file should be included/excluded
 228  * from the list of files based on its name and type etc.  The value of
 229  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 230 static int is_excluded(char *fname, int is_dir, int filter_level)
 231 {
 232 #if 0 /* This currently never happens, so avoid a useless compare. */
 233         if (filter_level == NO_FILTERS)
 234                 return 0;
 235 #endif
 236         if (fname) {
 237                 /* never exclude '.', even if somebody does --exclude '*' */
 238                 if (fname[0] == '.' && !fname[1])
 239                         return 0;
 240                 /* Handle the -R version of the '.' dir. */
 241                 if (fname[0] == '/') {
 242                         int len = strlen(fname);
 243                         if (fname[len-1] == '.' && fname[len-2] == '/')
 244                                 return 0;
 245                 }
 246         }
 247         if (server_filter_list.head
 248             && check_filter(&server_filter_list, fname, is_dir) < 0)
 249                 return 1;
 250         if (filter_level != ALL_FILTERS)
 251                 return 0;
 252         if (filter_list.head
 253             && check_filter(&filter_list, fname, is_dir) < 0)
 254                 return 1;
 255         return 0;
 256 }
 257
 258 static void send_directory(int f, struct file_list *flist, int ndx,
 259                            char *fbuf, int len, int flags);
 260
 261 static const char *flist_dir, *orig_dir;
 262 static int flist_dir_len;
 263
 264
 265 /**
 266  * Make sure @p flist is big enough to hold at least @p flist->count
 267  * entries.
 268  **/
 269 void flist_expand(struct file_list *flist)
 270 {
 271         struct file_struct **new_ptr;
 272
 273         if (flist->count < flist->malloced)
 274                 return;
 275
 276         if (flist->malloced < FLIST_START)
 277                 flist->malloced = FLIST_START;
 278         else if (flist->malloced >= FLIST_LINEAR)
 279                 flist->malloced += FLIST_LINEAR;
 280         else
 281                 flist->malloced *= 2;
 282
 283         /*
 284          * In case count jumped or we are starting the list
 285          * with a known size just set it.
 286          */
 287         if (flist->malloced < flist->count)
 288                 flist->malloced = flist->count;
 289
 290         new_ptr = realloc_array(flist->files, struct file_struct *,
 291                                 flist->malloced);
 292
 293         if (verbose >= 2 && flist->malloced != FLIST_START) {
 294                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
 295                     who_am_i(),
 296                     (double)sizeof flist->files[0] * flist->malloced,
 297                     (new_ptr == flist->files) ? " not" : "");
 298         }
 299
 300         flist->files = new_ptr;
 301
 302         if (!flist->files)
 303                 out_of_memory("flist_expand");
 304 }
 305
 306 int push_flist_dir(const char *dir, int len)
 307 {
 308         if (dir == flist_dir)
 309                 return 1;
 310
 311         if (!orig_dir)
 312                 orig_dir = strdup(curr_dir);
 313
 314         if (flist_dir && !pop_dir(orig_dir)) {
 315                 rsyserr(FERROR, errno, "pop_dir %s failed",
 316                         full_fname(orig_dir));
 317                 exit_cleanup(RERR_FILESELECT);
 318         }
 319
 320         if (dir && !push_dir(dir, 0)) {
 321                 io_error |= IOERR_GENERAL;
 322                 rsyserr(FERROR, errno, "push_dir %s failed in %s",
 323                         full_fname(dir), curr_dir);
 324                 return 0;
 325         }
 326
 327         flist_dir = dir;
 328         flist_dir_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 329
 330         return 1;
 331 }
 332
 333 static void send_file_entry(int f, struct file_struct *file, int ndx)
 334 {
 335         static time_t modtime;
 336         static mode_t mode;
 337         static int64 dev;
 338         static dev_t rdev;
 339         static uint32 rdev_major;
 340         static uid_t uid;
 341         static gid_t gid;
 342         static char *user_name, *group_name;
 343         static char lastname[MAXPATHLEN];
 344         char fname[MAXPATHLEN];
 345         int first_hlink_ndx = -1;
 346         int l1, l2;
 347         int flags;
 348
 349         f_name(file, fname);
 350
 351         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 352
 353         if (file->mode == mode)
 354                 flags |= XMIT_SAME_MODE;
 355         else
 356                 mode = file->mode;
 357         if ((preserve_devices && IS_DEVICE(mode))
 358          || (preserve_specials && IS_SPECIAL(mode))) {
 359                 if (protocol_version < 28) {
 360                         if (tmp_rdev == rdev)
 361                                 flags |= XMIT_SAME_RDEV_pre28;
 362                         else
 363                                 rdev = tmp_rdev;
 364                 } else {
 365                         rdev = tmp_rdev;
 366                         if ((uint32)major(rdev) == rdev_major)
 367                                 flags |= XMIT_SAME_RDEV_MAJOR;
 368                         else
 369                                 rdev_major = major(rdev);
 370                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 371                                 flags |= XMIT_RDEV_MINOR_8_pre30;
 372                 }
 373         } else if (protocol_version < 28)
 374                 rdev = MAKEDEV(0, 0);
 375         if (preserve_uid) {
 376                 if (F_UID(file) == uid && *lastname)
 377                         flags |= XMIT_SAME_UID;
 378                 else {
 379                         uid = F_UID(file);
 380                         if (preserve_uid && !numeric_ids) {
 381                                 user_name = add_uid(uid);
 382                                 if (inc_recurse && user_name)
 383                                         flags |= XMIT_USER_NAME_FOLLOWS;
 384                         }
 385                 }
 386         }
 387         if (preserve_gid) {
 388                 if (F_GID(file) == gid && *lastname)
 389                         flags |= XMIT_SAME_GID;
 390                 else {
 391                         gid = F_GID(file);
 392                         if (preserve_gid && !numeric_ids) {
 393                                 group_name = add_gid(gid);
 394                                 if (inc_recurse && group_name)
 395                                         flags |= XMIT_GROUP_NAME_FOLLOWS;
 396                         }
 397                 }
 398         }
 399         if (file->modtime == modtime)
 400                 flags |= XMIT_SAME_TIME;
 401         else
 402                 modtime = file->modtime;
 403
 404 #ifdef SUPPORT_HARD_LINKS
 405         if (tmp_dev != 0) {
 406                 if (protocol_version >= 30) {
 407                         struct idev_node *np = idev_node(tmp_dev, tmp_ino);
 408                         first_hlink_ndx = (int32)(long)np->data - 1;
 409                         if (first_hlink_ndx < 0) {
 410                                 np->data = (void*)(long)(ndx + 1);
 411                                 flags |= XMIT_HLINK_FIRST;
 412                         }
 413                         flags |= XMIT_HLINKED;
 414                 } else {
 415                         if (tmp_dev == dev) {
 416                                 if (protocol_version >= 28)
 417                                         flags |= XMIT_SAME_DEV_pre30;
 418                         } else
 419                                 dev = tmp_dev;
 420                         flags |= XMIT_HLINKED;
 421                 }
 422         }
 423 #endif
 424
 425         for (l1 = 0;
 426             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 427             l1++) {}
 428         l2 = strlen(fname+l1);
 429
 430         if (l1 > 0)
 431                 flags |= XMIT_SAME_NAME;
 432         if (l2 > 255)
 433                 flags |= XMIT_LONG_NAME;
 434
 435         /* We must make sure we don't send a zero flag byte or the
 436          * other end will terminate the flist transfer.  Note that
 437          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 438          * it's harmless way to add a bit to the first flag byte. */
 439         if (protocol_version >= 28) {
 440                 if (!flags && !S_ISDIR(mode))
 441                         flags |= XMIT_TOP_DIR;
 442                 if ((flags & 0xFF00) || !flags) {
 443                         flags |= XMIT_EXTENDED_FLAGS;
 444                         write_shortint(f, flags);
 445                 } else
 446                         write_byte(f, flags);
 447         } else {
 448                 if (!(flags & 0xFF))
 449                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 450                 write_byte(f, flags);
 451         }
 452         if (flags & XMIT_SAME_NAME)
 453                 write_byte(f, l1);
 454         if (flags & XMIT_LONG_NAME)
 455                 write_varint30(f, l2);
 456         else
 457                 write_byte(f, l2);
 458         write_buf(f, fname + l1, l2);
 459
 460         if (first_hlink_ndx >= 0) {
 461                 write_varint30(f, first_hlink_ndx);
 462                 goto the_end;
 463         }
 464
 465         write_varlong30(f, F_LENGTH(file), 3);
 466         if (!(flags & XMIT_SAME_TIME)) {
 467                 if (protocol_version >= 30)
 468                         write_varlong(f, modtime, 4);
 469                 else
 470                         write_int(f, modtime);
 471         }
 472         if (!(flags & XMIT_SAME_MODE))
 473                 write_int(f, to_wire_mode(mode));
 474         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 475                 if (protocol_version < 30)
 476                         write_int(f, uid);
 477                 else {
 478                         write_varint(f, uid);
 479                         if (flags & XMIT_USER_NAME_FOLLOWS) {
 480                                 int len = strlen(user_name);
 481                                 write_byte(f, len);
 482                                 write_buf(f, user_name, len);
 483                         }
 484                 }
 485         }
 486         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 487                 if (protocol_version < 30)
 488                         write_int(f, gid);
 489                 else {
 490                         write_varint(f, gid);
 491                         if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 492                                 int len = strlen(group_name);
 493                                 write_byte(f, len);
 494                                 write_buf(f, group_name, len);
 495                         }
 496                 }
 497         }
 498         if ((preserve_devices && IS_DEVICE(mode))
 499          || (preserve_specials && IS_SPECIAL(mode))) {
 500                 if (protocol_version < 28) {
 501                         if (!(flags & XMIT_SAME_RDEV_pre28))
 502                                 write_int(f, (int)rdev);
 503                 } else {
 504                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 505                                 write_varint30(f, major(rdev));
 506                         if (protocol_version >= 30)
 507                                 write_varint(f, minor(rdev));
 508                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 509                                 write_byte(f, minor(rdev));
 510                         else
 511                                 write_int(f, minor(rdev));
 512                 }
 513         }
 514
 515 #ifdef SUPPORT_LINKS
 516         if (preserve_links && S_ISLNK(mode)) {
 517                 const char *sl = F_SYMLINK(file);
 518                 int len = strlen(sl);
 519                 write_varint30(f, len);
 520                 write_buf(f, sl, len);
 521         }
 522 #endif
 523
 524 #ifdef SUPPORT_HARD_LINKS
 525         if (tmp_dev != 0 && protocol_version < 30) {
 526                 if (protocol_version < 26) {
 527                         /* 32-bit dev_t and ino_t */
 528                         write_int(f, (int32)dev);
 529                         write_int(f, (int32)tmp_ino);
 530                 } else {
 531                         /* 64-bit dev_t and ino_t */
 532                         if (!(flags & XMIT_SAME_DEV_pre30))
 533                                 write_longint(f, dev);
 534                         write_longint(f, tmp_ino);
 535                 }
 536         }
 537 #endif
 538
 539         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 540                 const char *sum;
 541                 if (S_ISREG(mode))
 542                         sum = tmp_sum;
 543                 else {
 544                         /* Prior to 28, we sent a useless set of nulls. */
 545                         sum = empty_sum;
 546                 }
 547                 write_buf(f, sum, checksum_len);
 548         }
 549
 550   the_end:
 551         strlcpy(lastname, fname, MAXPATHLEN);
 552
 553         if (S_ISREG(mode) || S_ISLNK(mode))
 554                 stats.total_size += F_LENGTH(file);
 555 }
 556
 557 static struct file_struct *recv_file_entry(struct file_list *flist,
 558                                            int flags, int f)
 559 {
 560         static int64 modtime;
 561         static mode_t mode;
 562         static int64 dev;
 563         static dev_t rdev;
 564         static uint32 rdev_major;
 565         static uid_t uid;
 566         static gid_t gid;
 567         static char lastname[MAXPATHLEN], *lastdir;
 568         static int lastdir_depth, lastdir_len = -1;
 569         static unsigned int del_hier_name_len = 0;
 570         static int in_del_hier = 0;
 571         char thisname[MAXPATHLEN];
 572         unsigned int l1 = 0, l2 = 0;
 573         int alloc_len, basename_len, linkname_len;
 574         int extra_len = file_extra_cnt * EXTRA_LEN;
 575         int first_hlink_ndx = -1;
 576         OFF_T file_length;
 577         const char *basename;
 578         char *bp;
 579         struct file_struct *file;
 580
 581         if (flags & XMIT_SAME_NAME)
 582                 l1 = read_byte(f);
 583
 584         if (flags & XMIT_LONG_NAME)
 585                 l2 = read_varint30(f);
 586         else
 587                 l2 = read_byte(f);
 588
 589         if (l2 >= MAXPATHLEN - l1) {
 590                 rprintf(FERROR,
 591                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 592                         flags, l1, l2, lastname, who_am_i());
 593                 overflow_exit("recv_file_entry");
 594         }
 595
 596         strlcpy(thisname, lastname, l1 + 1);
 597         read_sbuf(f, &thisname[l1], l2);
 598         thisname[l1 + l2] = 0;
 599
 600         strlcpy(lastname, thisname, MAXPATHLEN);
 601
 602         clean_fname(thisname, 0);
 603
 604         if (sanitize_paths)
 605                 sanitize_path(thisname, thisname, "", 0, NULL);
 606
 607         if ((basename = strrchr(thisname, '/')) != NULL) {
 608                 int len = basename++ - thisname;
 609                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 610                         lastdir = new_array(char, len + 1);
 611                         memcpy(lastdir, thisname, len);
 612                         lastdir[len] = '\0';
 613                         lastdir_len = len;
 614                         lastdir_depth = count_dir_elements(lastdir);
 615                 }
 616         } else
 617                 basename = thisname;
 618         basename_len = strlen(basename) + 1; /* count the '\0' */
 619
 620 #ifdef SUPPORT_HARD_LINKS
 621         if (protocol_version >= 30
 622          && BITS_SETnUNSET(flags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 623                 struct file_struct *first;
 624                 first_hlink_ndx = read_varint30(f);
 625                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->count) {
 626                         rprintf(FERROR,
 627                                 "hard-link reference out of range: %d (%d)\n",
 628                                 first_hlink_ndx, flist->count);
 629                         exit_cleanup(RERR_PROTOCOL);
 630                 }
 631                 first = flist->files[first_hlink_ndx];
 632                 file_length = F_LENGTH(first);
 633                 modtime = first->modtime;
 634                 mode = first->mode;
 635                 if (preserve_uid)
 636                         uid = F_UID(first);
 637                 if (preserve_gid)
 638                         gid = F_GID(first);
 639                 if ((preserve_devices && IS_DEVICE(mode))
 640                  || (preserve_specials && IS_SPECIAL(mode))) {
 641                         uint32 *devp = F_RDEV_P(first);
 642                         rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 643                         extra_len += 2 * EXTRA_LEN;
 644                 }
 645                 if (preserve_links && S_ISLNK(mode))
 646                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 647                 else
 648                         linkname_len = 0;
 649                 goto create_object;
 650         }
 651 #endif
 652
 653         file_length = read_varlong30(f, 3);
 654         if (!(flags & XMIT_SAME_TIME)) {
 655                 if (protocol_version >= 30) {
 656                         modtime = read_varlong(f, 4);
 657 #if SIZEOF_TIME_T < SIZEOF_INT64
 658                         if ((modtime > INT_MAX || modtime < INT_MIN) && !am_generator) {
 659                                 rprintf(FERROR,
 660                                     "Time value of %s truncated on receiver.\n",
 661                                     lastname);
 662                         }
 663 #endif
 664                 } else
 665                         modtime = read_int(f);
 666         }
 667         if (!(flags & XMIT_SAME_MODE))
 668                 mode = from_wire_mode(read_int(f));
 669
 670         if (chmod_modes && !S_ISLNK(mode))
 671                 mode = tweak_mode(mode, chmod_modes);
 672
 673         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 674                 if (protocol_version < 30)
 675                         uid = (uid_t)read_int(f);
 676                 else {
 677                         uid = (uid_t)read_varint(f);
 678                         if (flags & XMIT_USER_NAME_FOLLOWS)
 679                                 uid = recv_user_name(f, uid);
 680                         else if (inc_recurse && am_root && !numeric_ids)
 681                                 uid = match_uid(uid);
 682                 }
 683         }
 684         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 685                 if (protocol_version < 30)
 686                         gid = (gid_t)read_int(f);
 687                 else {
 688                         gid = (gid_t)read_varint(f);
 689                         if (flags & XMIT_GROUP_NAME_FOLLOWS)
 690                                 gid = recv_group_name(f, gid);
 691                         else if (inc_recurse && (!am_root || !numeric_ids))
 692                                 gid = match_gid(gid);
 693                 }
 694         }
 695
 696         if ((preserve_devices && IS_DEVICE(mode))
 697          || (preserve_specials && IS_SPECIAL(mode))) {
 698                 if (protocol_version < 28) {
 699                         if (!(flags & XMIT_SAME_RDEV_pre28))
 700                                 rdev = (dev_t)read_int(f);
 701                 } else {
 702                         uint32 rdev_minor;
 703                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 704                                 rdev_major = read_varint30(f);
 705                         if (protocol_version >= 30)
 706                                 rdev_minor = read_varint(f);
 707                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 708                                 rdev_minor = read_byte(f);
 709                         else
 710                                 rdev_minor = read_int(f);
 711                         rdev = MAKEDEV(rdev_major, rdev_minor);
 712                 }
 713                 extra_len += 2 * EXTRA_LEN;
 714                 file_length = 0;
 715         } else if (protocol_version < 28)
 716                 rdev = MAKEDEV(0, 0);
 717
 718 #ifdef SUPPORT_LINKS
 719         if (preserve_links && S_ISLNK(mode)) {
 720                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 721                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 722                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 723                                 linkname_len - 1);
 724                         overflow_exit("recv_file_entry");
 725                 }
 726         }
 727         else
 728 #endif
 729                 linkname_len = 0;
 730
 731 #ifdef SUPPORT_HARD_LINKS
 732   create_object:
 733         if (preserve_hard_links) {
 734                 if (protocol_version < 28 && S_ISREG(mode))
 735                         flags |= XMIT_HLINKED;
 736                 if (flags & XMIT_HLINKED)
 737                         extra_len += EXTRA_LEN;
 738         }
 739 #endif
 740
 741 #ifdef SUPPORT_ACLS
 742         /* We need one or two index int32s when we're preserving ACLs. */
 743         if (preserve_acls)
 744                 extra_len += (S_ISDIR(mode) ? 2 : 1) * EXTRA_LEN;
 745 #endif
 746
 747         if (always_checksum && S_ISREG(mode))
 748                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 749
 750         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 751                 extra_len += EXTRA_LEN;
 752
 753 #if EXTRA_ROUNDING > 0
 754         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 755                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 756 #endif
 757
 758         if (inc_recurse && S_ISDIR(mode)) {
 759                 if (one_file_system) {
 760                         /* Room to save the dir's device for -x */
 761                         extra_len += 2 * EXTRA_LEN;
 762                 }
 763                 flist = dir_flist;
 764         }
 765
 766         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 767                   + linkname_len;
 768         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
 769
 770         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 771         bp += extra_len;
 772         file = (struct file_struct *)bp;
 773         bp += FILE_STRUCT_LEN;
 774
 775         memcpy(bp, basename, basename_len);
 776         bp += basename_len + linkname_len; /* skip space for symlink too */
 777
 778 #ifdef SUPPORT_HARD_LINKS
 779         if (flags & XMIT_HLINKED)
 780                 file->flags |= FLAG_HLINKED;
 781 #endif
 782         file->modtime = (time_t)modtime;
 783         file->len32 = (uint32)file_length;
 784         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 785                 file->flags |= FLAG_LENGTH64;
 786                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 787         }
 788         file->mode = mode;
 789         if (preserve_uid)
 790                 F_OWNER(file) = uid;
 791         if (preserve_gid)
 792                 F_GROUP(file) = gid;
 793
 794         if (basename != thisname) {
 795                 file->dirname = lastdir;
 796                 F_DEPTH(file) = lastdir_depth + 1;
 797         } else
 798                 F_DEPTH(file) = 1;
 799
 800         if (S_ISDIR(mode)) {
 801                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 802                         F_DEPTH(file)--;
 803                 if (flags & XMIT_TOP_DIR) {
 804                         in_del_hier = recurse;
 805                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 806                         if (relative_paths && del_hier_name_len > 2
 807                             && lastname[del_hier_name_len-1] == '.'
 808                             && lastname[del_hier_name_len-2] == '/')
 809                                 del_hier_name_len -= 2;
 810                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 811                 } else if (in_del_hier) {
 812                         if (!relative_paths || !del_hier_name_len
 813                          || (l1 >= del_hier_name_len
 814                           && lastname[del_hier_name_len] == '/'))
 815                                 file->flags |= FLAG_XFER_DIR;
 816                         else
 817                                 in_del_hier = 0;
 818                 }
 819         }
 820
 821         if ((preserve_devices && IS_DEVICE(mode))
 822          || (preserve_specials && IS_SPECIAL(mode))) {
 823                 uint32 *devp = F_RDEV_P(file);
 824                 DEV_MAJOR(devp) = major(rdev);
 825                 DEV_MINOR(devp) = minor(rdev);
 826         }
 827
 828 #ifdef SUPPORT_LINKS
 829         if (linkname_len) {
 830                 bp = (char*)file->basename + basename_len;
 831                 if (first_hlink_ndx >= 0) {
 832                         struct file_struct *first = flist->files[first_hlink_ndx];
 833                         memcpy(bp, F_SYMLINK(first), linkname_len);
 834                 } else
 835                         read_sbuf(f, bp, linkname_len - 1);
 836                 if (sanitize_paths)
 837                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 838         }
 839 #endif
 840
 841 #ifdef SUPPORT_HARD_LINKS
 842         if (preserve_hard_links && flags & XMIT_HLINKED) {
 843                 if (protocol_version >= 30) {
 844                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 845                                         ? flist->count : first_hlink_ndx;
 846                 } else {
 847                         static int32 cnt = 0;
 848                         struct idev_node *np;
 849                         int64 ino;
 850                         int32 ndx;
 851                         if (protocol_version < 26) {
 852                                 dev = read_int(f);
 853                                 ino = read_int(f);
 854                         } else {
 855                                 if (!(flags & XMIT_SAME_DEV_pre30))
 856                                         dev = read_longint(f);
 857                                 ino = read_longint(f);
 858                         }
 859                         np = idev_node(dev, ino);
 860                         ndx = (int32)(long)np->data - 1;
 861                         if (ndx < 0) {
 862                                 ndx = cnt++;
 863                                 np->data = (void*)(long)cnt;
 864                         }
 865                         F_HL_GNUM(file) = ndx;
 866                 }
 867         }
 868 #endif
 869
 870         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 871                 if (S_ISREG(mode))
 872                         bp = (char*)F_SUM(file);
 873                 else {
 874                         /* Prior to 28, we get a useless set of nulls. */
 875                         bp = tmp_sum;
 876                 }
 877                 if (first_hlink_ndx >= 0) {
 878                         struct file_struct *first = flist->files[first_hlink_ndx];
 879                         memcpy(bp, F_SUM(first), checksum_len);
 880                 } else
 881                         read_buf(f, bp, checksum_len);
 882         }
 883
 884 #ifdef SUPPORT_ACLS
 885         if (preserve_acls && !S_ISLNK(mode))
 886                 receive_acl(file, f);
 887 #endif
 888 #ifdef SUPPORT_XATTRS
 889         if (preserve_xattrs)
 890                 receive_xattr(file, f );
 891 #endif
 892
 893         if (S_ISREG(mode) || S_ISLNK(mode))
 894                 stats.total_size += file_length;
 895
 896         return file;
 897 }
 898
 899 /**
 900  * Create a file_struct for a named file by reading its stat()
 901  * information and performing extensive checks against global
 902  * options.
 903  *
 904  * @return the new file, or NULL if there was an error or this file
 905  * should be excluded.
 906  *
 907  * @todo There is a small optimization opportunity here to avoid
 908  * stat()ing the file in some circumstances, which has a certain cost.
 909  * We are called immediately after doing readdir(), and so we may
 910  * already know the d_type of the file.  We could for example avoid
 911  * statting directories if we're not recursing, but this is not a very
 912  * important case.  Some systems may not have d_type.
 913  **/
 914 struct file_struct *make_file(const char *fname, struct file_list *flist,
 915                               STRUCT_STAT *stp, int flags, int filter_level)
 916 {
 917         static char *lastdir;
 918         static int lastdir_len = -1;
 919         struct file_struct *file;
 920         STRUCT_STAT st;
 921         char thisname[MAXPATHLEN];
 922         char linkname[MAXPATHLEN];
 923         int alloc_len, basename_len, linkname_len;
 924         int extra_len = file_extra_cnt * EXTRA_LEN;
 925         const char *basename;
 926         char *bp;
 927
 928         if (strlcpy(thisname, fname, sizeof thisname)
 929             >= sizeof thisname - flist_dir_len) {
 930                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 931                 return NULL;
 932         }
 933         clean_fname(thisname, 0);
 934         if (sanitize_paths)
 935                 sanitize_path(thisname, thisname, "", 0, NULL);
 936
 937         if (stp && S_ISDIR(stp->st_mode)) {
 938                 st = *stp; /* Needed for "symlink/." with --relative. */
 939                 *linkname = '\0'; /* make IBM code checker happy */
 940         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 941                 int save_errno = errno;
 942                 /* See if file is excluded before reporting an error. */
 943                 if (filter_level != NO_FILTERS
 944                  && (is_excluded(thisname, 0, filter_level)
 945                   || is_excluded(thisname, 1, filter_level))) {
 946                         if (ignore_perishable && save_errno != ENOENT)
 947                                 non_perishable_cnt++;
 948                         return NULL;
 949                 }
 950                 if (save_errno == ENOENT) {
 951 #ifdef SUPPORT_LINKS
 952                         /* Avoid "vanished" error if symlink points nowhere. */
 953                         if (copy_links && x_lstat(thisname, &st, NULL) == 0
 954                             && S_ISLNK(st.st_mode)) {
 955                                 io_error |= IOERR_GENERAL;
 956                                 rprintf(FERROR, "symlink has no referent: %s\n",
 957                                         full_fname(thisname));
 958                         } else
 959 #endif
 960                         {
 961                                 enum logcode c = am_daemon && protocol_version < 28
 962                                     ? FERROR : FINFO;
 963                                 io_error |= IOERR_VANISHED;
 964                                 rprintf(c, "file has vanished: %s\n",
 965                                         full_fname(thisname));
 966                         }
 967                 } else {
 968                         io_error |= IOERR_GENERAL;
 969                         rsyserr(FERROR, save_errno, "readlink %s failed",
 970                                 full_fname(thisname));
 971                 }
 972                 return NULL;
 973         }
 974
 975         /* backup.c calls us with filter_level set to NO_FILTERS. */
 976         if (filter_level == NO_FILTERS)
 977                 goto skip_filters;
 978
 979         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 980                 rprintf(FINFO, "skipping directory %s\n", thisname);
 981                 return NULL;
 982         }
 983
 984         /* -x only affects directories because we need to avoid recursing
 985          * into a mount-point directory, not to avoid copying a symlinked
 986          * file if -L (or similar) was specified. */
 987         if (one_file_system && st.st_dev != filesystem_dev
 988          && S_ISDIR(st.st_mode)) {
 989                 if (one_file_system > 1) {
 990                         if (verbose > 2) {
 991                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 992                                         thisname);
 993                         }
 994                         return NULL;
 995                 }
 996                 flags |= FLAG_MOUNT_DIR;
 997         }
 998
 999         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1000                 if (ignore_perishable)
1001                         non_perishable_cnt++;
1002                 return NULL;
1003         }
1004
1005         if (lp_ignore_nonreadable(module_id)) {
1006 #ifdef SUPPORT_LINKS
1007                 if (!S_ISLNK(st.st_mode))
1008 #endif
1009                         if (access(thisname, R_OK) != 0)
1010                                 return NULL;
1011         }
1012
1013   skip_filters:
1014
1015         /* Only divert a directory in the main transfer. */
1016         if (flist && flist->prev && S_ISDIR(st.st_mode)
1017          && flags & FLAG_DIVERT_DIRS) {
1018                 flist = dir_flist;
1019                 /* Room for parent/sibling/next-child info. */
1020                 extra_len += 3 * EXTRA_LEN;
1021         }
1022
1023         if (verbose > 2) {
1024                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1025                         who_am_i(), thisname, filter_level);
1026         }
1027
1028         if ((basename = strrchr(thisname, '/')) != NULL) {
1029                 int len = basename++ - thisname;
1030                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1031                         lastdir = new_array(char, len + 1);
1032                         memcpy(lastdir, thisname, len);
1033                         lastdir[len] = '\0';
1034                         lastdir_len = len;
1035                 }
1036         } else
1037                 basename = thisname;
1038         basename_len = strlen(basename) + 1; /* count the '\0' */
1039
1040 #ifdef SUPPORT_LINKS
1041         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1042 #else
1043         linkname_len = 0;
1044 #endif
1045
1046         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1047                 extra_len += EXTRA_LEN;
1048
1049 #if EXTRA_ROUNDING > 0
1050         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1051                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1052 #endif
1053
1054         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1055                   + linkname_len;
1056         if (flist)
1057                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1058         else {
1059                 if (!(bp = new_array(char, alloc_len)))
1060                         out_of_memory("make_file");
1061         }
1062
1063         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1064         bp += extra_len;
1065         file = (struct file_struct *)bp;
1066         bp += FILE_STRUCT_LEN;
1067
1068         memcpy(bp, basename, basename_len);
1069         bp += basename_len + linkname_len; /* skip space for symlink too */
1070
1071 #ifdef SUPPORT_HARD_LINKS
1072         if (preserve_hard_links && flist && flist->prev) {
1073                 if (protocol_version >= 28
1074                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1075                  : S_ISREG(st.st_mode)) {
1076                         tmp_dev = st.st_dev;
1077                         tmp_ino = st.st_ino;
1078                 } else
1079                         tmp_dev = 0;
1080         }
1081 #endif
1082
1083 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1084         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1085                 tmp_rdev = st.st_rdev;
1086                 st.st_size = 0;
1087         }
1088 #endif
1089
1090         file->flags = flags;
1091         file->modtime = st.st_mtime;
1092         file->len32 = (uint32)st.st_size;
1093         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1094                 file->flags |= FLAG_LENGTH64;
1095                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1096         }
1097         file->mode = st.st_mode;
1098         if (preserve_uid)
1099                 F_OWNER(file) = st.st_uid;
1100         if (preserve_gid)
1101                 F_GROUP(file) = st.st_gid;
1102
1103         if (basename != thisname)
1104                 file->dirname = lastdir;
1105
1106 #ifdef SUPPORT_LINKS
1107         if (linkname_len) {
1108                 bp = (char*)file->basename + basename_len;
1109                 memcpy(bp, linkname, linkname_len);
1110         }
1111 #endif
1112
1113         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1114                 file_checksum(thisname, tmp_sum, st.st_size);
1115
1116         F_ROOTDIR(file) = flist_dir;
1117
1118         /* This code is only used by the receiver when it is building
1119          * a list of files for a delete pass. */
1120         if (keep_dirlinks && linkname_len && flist) {
1121                 STRUCT_STAT st2;
1122                 int save_mode = file->mode;
1123                 file->mode = S_IFDIR; /* Find a directory with our name. */
1124                 if (flist_find(dir_flist, file) >= 0
1125                     && x_stat(thisname, &st2, NULL) == 0 && S_ISDIR(st2.st_mode)) {
1126                         file->modtime = st2.st_mtime;
1127                         file->len32 = 0;
1128                         file->mode = st2.st_mode;
1129                         if (preserve_uid)
1130                                 F_OWNER(file) = st2.st_uid;
1131                         if (preserve_gid)
1132                                 F_GROUP(file) = st2.st_gid;
1133                 } else
1134                         file->mode = save_mode;
1135         }
1136
1137         if (basename_len == 0+1)
1138                 return NULL;
1139
1140         if (inc_recurse && flist == dir_flist) {
1141                 flist_expand(flist);
1142                 flist->files[flist->count++] = file;
1143         }
1144
1145         return file;
1146 }
1147
1148 /* Only called for temporary file_struct entries created by make_file(). */
1149 void unmake_file(struct file_struct *file)
1150 {
1151         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1152 #if EXTRA_ROUNDING > 0
1153         if (extra_cnt & EXTRA_ROUNDING)
1154                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1155 #endif
1156         free(REQ_EXTRA(file, extra_cnt));
1157 }
1158
1159 static struct file_struct *send_file_name(int f, struct file_list *flist,
1160                                           char *fname, STRUCT_STAT *stp,
1161                                           int flags, int filter_flags)
1162 {
1163         struct file_struct *file;
1164 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1165         statx sx;
1166 #endif
1167
1168         file = make_file(fname, flist, stp, flags, filter_flags);
1169         if (!file)
1170                 return NULL;
1171
1172         if (chmod_modes && !S_ISLNK(file->mode))
1173                 file->mode = tweak_mode(file->mode, chmod_modes);
1174
1175 #ifdef SUPPORT_ACLS
1176         if (preserve_acls && !S_ISLNK(file->mode) && f >= 0) {
1177                 sx.st.st_mode = file->mode;
1178                 sx.acc_acl = sx.def_acl = NULL;
1179                 if (get_acl(fname, &sx) < 0)
1180                         return NULL;
1181         }
1182 #endif
1183 #ifdef SUPPORT_XATTRS
1184         if (preserve_xattrs && f >= 0) {
1185                 sx.xattr = NULL;
1186                 if (get_xattr(fname, &sx) < 0)
1187                         return NULL;
1188         }
1189 #endif
1190
1191         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1192
1193         flist_expand(flist);
1194         flist->files[flist->count++] = file;
1195         if (f >= 0) {
1196                 send_file_entry(f, file, flist->count - 1);
1197 #ifdef SUPPORT_ACLS
1198                 if (preserve_acls && !S_ISLNK(file->mode)) {
1199                         send_acl(&sx, f);
1200                         free_acl(&sx);
1201                 }
1202 #endif
1203 #ifdef SUPPORT_XATTRS
1204                 if (preserve_xattrs) {
1205                         F_XATTR(file) = send_xattr(&sx, f);
1206                         free_xattr(&sx);
1207                 }
1208 #endif
1209         }
1210         return file;
1211 }
1212
1213 static void send_if_directory(int f, struct file_list *flist,
1214                               struct file_struct *file,
1215                               char *fbuf, unsigned int ol,
1216                               int flags)
1217 {
1218         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1219
1220         if (S_ISDIR(file->mode)
1221             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1222                 void *save_filters;
1223                 unsigned int len = strlen(fbuf);
1224                 if (len > 1 && fbuf[len-1] == '/')
1225                         fbuf[--len] = '\0';
1226                 if (len >= MAXPATHLEN - 1) {
1227                         io_error |= IOERR_GENERAL;
1228                         rprintf(FERROR, "skipping long-named directory: %s\n",
1229                                 full_fname(fbuf));
1230                         return;
1231                 }
1232                 save_filters = push_local_filters(fbuf, len);
1233                 send_directory(f, flist, -1, fbuf, len, flags);
1234                 pop_local_filters(save_filters);
1235                 fbuf[ol] = '\0';
1236                 if (is_dot_dir)
1237                         fbuf[ol-1] = '.';
1238         }
1239 }
1240
1241 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1242 {
1243         return f_name_cmp(*file1, *file2);
1244 }
1245
1246 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1247  * sort them by name, and link them into the tree, setting the appropriate
1248  * parent/child/sibling pointers. */
1249 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1250 {
1251         int i;
1252         int32 *dp = NULL;
1253         int32 *parent_dp = parent_ndx < 0 ? NULL
1254                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1255
1256         qsort(dir_flist->files + start, end - start + 1,
1257               sizeof dir_flist->files[0], (int (*)())file_compare);
1258
1259         for (i = start; i <= end; i++) {
1260                 struct file_struct *file = dir_flist->files[i];
1261                 if (!(file->flags & FLAG_XFER_DIR)
1262                  || file->flags & FLAG_MOUNT_DIR)
1263                         continue;
1264                 if (dp)
1265                         DIR_NEXT_SIBLING(dp) = i;
1266                 else if (parent_dp)
1267                         DIR_FIRST_CHILD(parent_dp) = i;
1268                 else
1269                         send_dir_ndx = i;
1270                 dp = F_DIRNODE_P(file);
1271                 DIR_PARENT(dp) = parent_ndx;
1272                 DIR_FIRST_CHILD(dp) = -1;
1273         }
1274         if (dp)
1275                 DIR_NEXT_SIBLING(dp) = -1;
1276 }
1277
1278 /* This function is normally called by the sender, but the receiving side also
1279  * calls it from get_dirlist() with f set to -1 so that we just construct the
1280  * file list in memory without sending it over the wire.  Also, get_dirlist()
1281  * might call this with f set to -2, which also indicates that local filter
1282  * rules should be ignored. */
1283 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1284                            char *fbuf, int len, int flags)
1285 {
1286         struct dirent *di;
1287         unsigned remainder;
1288         char *p;
1289         DIR *d;
1290         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1291         int start = divert_dirs ? dir_flist->count : flist->count;
1292         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1293
1294         assert(flist != NULL);
1295
1296         if (!(d = opendir(fbuf))) {
1297                 io_error |= IOERR_GENERAL;
1298                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1299                 return;
1300         }
1301
1302         p = fbuf + len;
1303         if (len != 1 || *fbuf != '/')
1304                 *p++ = '/';
1305         *p = '\0';
1306         remainder = MAXPATHLEN - (p - fbuf);
1307
1308         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1309                 char *dname = d_name(di);
1310                 if (dname[0] == '.' && (dname[1] == '\0'
1311                     || (dname[1] == '.' && dname[2] == '\0')))
1312                         continue;
1313                 if (strlcpy(p, dname, remainder) >= remainder) {
1314                         io_error |= IOERR_GENERAL;
1315                         rprintf(FINFO,
1316                                 "cannot send long-named file %s\n",
1317                                 full_fname(fbuf));
1318                         continue;
1319                 }
1320
1321                 send_file_name(f, flist, fbuf, NULL, flags, filter_flags);
1322         }
1323
1324         fbuf[len] = '\0';
1325
1326         if (errno) {
1327                 io_error |= IOERR_GENERAL;
1328                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1329         }
1330
1331         closedir(d);
1332
1333         if (f < 0)
1334                 return;
1335
1336         if (divert_dirs)
1337                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1338         else if (recurse) {
1339                 int i, end = flist->count - 1;
1340                 /* send_if_directory() bumps flist->count, so use "end". */
1341                 for (i = start; i <= end; i++)
1342                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1343         }
1344 }
1345
1346 void send_extra_file_list(int f, int at_least)
1347 {
1348         char fbuf[MAXPATHLEN];
1349         struct file_list *flist;
1350         int64 start_write;
1351         int future_cnt, save_io_error = io_error;
1352
1353         if (flist_eof)
1354                 return;
1355
1356         /* Keep sending data until we have the requested number of
1357          * files in the upcoming file-lists. */
1358         if (cur_flist->next) {
1359                 flist = first_flist->prev; /* the newest flist */
1360                 future_cnt = flist->count
1361                            + flist->ndx_start - cur_flist->next->ndx_start;
1362         } else
1363                 future_cnt = 0;
1364         while (future_cnt < at_least) {
1365                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1366                 int32 *dp;
1367                 int dlen;
1368
1369                 f_name(file, fbuf);
1370                 dlen = strlen(fbuf);
1371
1372                 if (F_ROOTDIR(file) != flist_dir) {
1373                         if (!push_flist_dir(F_ROOTDIR(file), -1))
1374                                 exit_cleanup(RERR_FILESELECT);
1375                 }
1376
1377                 flist = flist_new(0, "send_extra_file_list");
1378                 start_write = stats.total_written;
1379
1380                 write_ndx(f, NDX_FLIST_OFFSET - send_dir_ndx);
1381                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1382                 send_directory(f, flist, send_dir_ndx, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1383                 write_byte(f, 0);
1384
1385                 clean_flist(flist, 0, 0);
1386                 file_total += flist->count;
1387                 future_cnt += flist->count;
1388                 stats.flist_size += stats.total_written - start_write;
1389                 stats.num_files += flist->count;
1390                 if (verbose > 3)
1391                         output_flist(flist);
1392
1393                 dp = F_DIRNODE_P(file);
1394                 if (DIR_FIRST_CHILD(dp) >= 0) {
1395                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1396                         send_dir_depth++;
1397                 } else {
1398                         while (DIR_NEXT_SIBLING(dp) < 0) {
1399                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1400                                         write_ndx(f, NDX_FLIST_EOF);
1401                                         flist_eof = 1;
1402                                         change_local_filter_dir(NULL, 0, 0);
1403                                         goto finish;
1404                                 }
1405                                 send_dir_depth--;
1406                                 file = dir_flist->files[send_dir_ndx];
1407                                 dp = F_DIRNODE_P(file);
1408                         }
1409                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1410                 }
1411         }
1412
1413   finish:
1414         if (io_error != save_io_error && !ignore_errors)
1415                 send_msg_int(MSG_IO_ERROR, io_error);
1416 }
1417
1418 struct file_list *send_file_list(int f, int argc, char *argv[])
1419 {
1420         int len;
1421         STRUCT_STAT st;
1422         char *p, *dir;
1423         char lastpath[MAXPATHLEN] = "";
1424         struct file_list *flist;
1425         struct timeval start_tv, end_tv;
1426         int64 start_write;
1427         int use_ff_fd = 0;
1428         int flags, disable_buffering;
1429
1430         rprintf(FLOG, "building file list\n");
1431         if (show_filelist_p())
1432                 start_filelist_progress("building file list");
1433         else if (inc_recurse && verbose && !am_server)
1434                 rprintf(FCLIENT, "sending incremental file list\n");
1435
1436         start_write = stats.total_written;
1437         gettimeofday(&start_tv, NULL);
1438
1439 #ifdef SUPPORT_HARD_LINKS
1440         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1441                 init_hard_links();
1442 #endif
1443
1444         flist = cur_flist = flist_new(0, "send_file_list");
1445         if (inc_recurse) {
1446                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1447                 flags = FLAG_DIVERT_DIRS;
1448         } else {
1449                 dir_flist = cur_flist;
1450                 flags = 0;
1451         }
1452
1453         disable_buffering = io_start_buffering_out(f);
1454         if (filesfrom_fd >= 0) {
1455                 if (argv[0] && !push_dir(argv[0], 0)) {
1456                         rsyserr(FERROR, errno, "push_dir %s failed in %s",
1457                                 full_fname(argv[0]), curr_dir);
1458                         exit_cleanup(RERR_FILESELECT);
1459                 }
1460                 use_ff_fd = 1;
1461         }
1462
1463         while (1) {
1464                 char fbuf[MAXPATHLEN];
1465                 char *fn;
1466                 int is_dot_dir;
1467
1468                 if (use_ff_fd) {
1469                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1470                                 break;
1471                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1472                 } else {
1473                         if (argc-- == 0)
1474                                 break;
1475                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1476                         if (sanitize_paths)
1477                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1478                 }
1479
1480                 len = strlen(fbuf);
1481                 if (relative_paths) {
1482                         /* We clean up fbuf below. */
1483                         is_dot_dir = 0;
1484                 } else if (!len || fbuf[len - 1] == '/') {
1485                         if (len == 2 && fbuf[0] == '.') {
1486                                 /* Turn "./" into just "." rather than "./." */
1487                                 fbuf[1] = '\0';
1488                         } else {
1489                                 if (len + 1 >= MAXPATHLEN)
1490                                         overflow_exit("send_file_list");
1491                                 fbuf[len++] = '.';
1492                                 fbuf[len] = '\0';
1493                         }
1494                         is_dot_dir = 1;
1495                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1496                     && (len == 2 || fbuf[len-3] == '/')) {
1497                         if (len + 2 >= MAXPATHLEN)
1498                                 overflow_exit("send_file_list");
1499                         fbuf[len++] = '/';
1500                         fbuf[len++] = '.';
1501                         fbuf[len] = '\0';
1502                         is_dot_dir = 1;
1503                 } else {
1504                         is_dot_dir = fbuf[len-1] == '.'
1505                                    && (len == 1 || fbuf[len-2] == '/');
1506                 }
1507
1508                 dir = NULL;
1509
1510                 if (!relative_paths) {
1511                         p = strrchr(fbuf, '/');
1512                         if (p) {
1513                                 *p = '\0';
1514                                 if (p == fbuf)
1515                                         dir = "/";
1516                                 else
1517                                         dir = fbuf;
1518                                 len -= p - fbuf + 1;
1519                                 fn = p + 1;
1520                         } else
1521                                 fn = fbuf;
1522                 } else {
1523                         if ((p = strstr(fbuf, "/./")) != NULL) {
1524                                 *p = '\0';
1525                                 if (p == fbuf)
1526                                         dir = "/";
1527                                 else
1528                                         dir = fbuf;
1529                                 len -= p - fbuf + 3;
1530                                 fn = p + 3;
1531                         } else
1532                                 fn = fbuf;
1533                         /* Get rid of trailing "/" and "/.". */
1534                         while (len) {
1535                                 if (fn[len - 1] == '/') {
1536                                         is_dot_dir = 1;
1537                                         if (!--len && !dir) {
1538                                                 len++;
1539                                                 break;
1540                                         }
1541                                 }
1542                                 else if (len >= 2 && fn[len - 1] == '.'
1543                                                   && fn[len - 2] == '/') {
1544                                         is_dot_dir = 1;
1545                                         if (!(len -= 2) && !dir) {
1546                                                 len++;
1547                                                 break;
1548                                         }
1549                                 } else
1550                                         break;
1551                         }
1552                         if (len == 1 && fn[0] == '/')
1553                                 fn[len++] = '.';
1554                         fn[len] = '\0';
1555                         /* Reject a ".." dir in the active part of the path. */
1556                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1557                                 if ((p[2] == '/' || p[2] == '\0')
1558                                  && (p == fn || p[-1] == '/')) {
1559                                         rprintf(FERROR,
1560                                             "found \"..\" dir in relative path: %s\n",
1561                                             fbuf);
1562                                         exit_cleanup(RERR_SYNTAX);
1563                                 }
1564                         }
1565                 }
1566
1567                 if (!*fn) {
1568                         len = 1;
1569                         fn = ".";
1570                 }
1571
1572                 if (dir && *dir) {
1573                         static const char *lastdir;
1574                         static int lastdir_len = -1;
1575                         int len = strlen(dir);
1576
1577                         if (len != lastdir_len || memcmp(lastdir, dir, len) != 0) {
1578                                 if (!push_flist_dir(strdup(dir), len))
1579                                         goto push_error;
1580                                 lastdir = flist_dir;
1581                                 lastdir_len = flist_dir_len;
1582                         } else if (!push_flist_dir(lastdir, lastdir_len)) {
1583                           push_error:
1584                                 io_error |= IOERR_GENERAL;
1585                                 rsyserr(FERROR, errno, "push_dir %s failed in %s",
1586                                         full_fname(dir), curr_dir);
1587                                 continue;
1588                         }
1589                 }
1590
1591                 if (fn != fbuf)
1592                         memmove(fbuf, fn, len + 1);
1593
1594                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1595                         io_error |= IOERR_GENERAL;
1596                         rsyserr(FERROR, errno, "link_stat %s failed",
1597                                 full_fname(fbuf));
1598                         continue;
1599                 }
1600
1601                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1602                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1603                         continue;
1604                 }
1605
1606                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1607                         /* Send the implied directories at the start of the
1608                          * source spec, so we get their permissions right. */
1609                         char *lp = lastpath, *slash = fbuf;
1610                         *p = '\0';
1611                         /* Skip any initial directories in our path that we
1612                          * have in common with lastpath. */
1613                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1614                                 if (*fn == '/')
1615                                         slash = fn;
1616                         }
1617                         *p = '/';
1618                         if (fn != p || (*lp && *lp != '/')) {
1619                                 int save_copy_links = copy_links;
1620                                 int save_xfer_dirs = xfer_dirs;
1621                                 int dir_flags = inc_recurse ? FLAG_DIVERT_DIRS : 0;
1622                                 copy_links |= copy_unsafe_links;
1623                                 xfer_dirs = 1;
1624                                 while ((slash = strchr(slash+1, '/')) != 0) {
1625                                         *slash = '\0';
1626                                         send_file_name(f, flist, fbuf, NULL,
1627                                                        dir_flags, ALL_FILTERS);
1628                                         *slash = '/';
1629                                 }
1630                                 copy_links = save_copy_links;
1631                                 xfer_dirs = save_xfer_dirs;
1632                                 *p = '\0';
1633                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1634                                 *p = '/';
1635                         }
1636                 }
1637
1638                 if (one_file_system)
1639                         filesystem_dev = st.st_dev;
1640
1641                 if (recurse || (xfer_dirs && is_dot_dir)) {
1642                         struct file_struct *file;
1643                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR
1644                                       | (is_dot_dir ? 0 : flags)
1645                                       | (inc_recurse ? FLAG_DIVERT_DIRS : 0);
1646                         file = send_file_name(f, flist, fbuf, &st,
1647                                               top_flags, ALL_FILTERS);
1648                         if (file && !inc_recurse)
1649                                 send_if_directory(f, flist, file, fbuf, len, flags);
1650                 } else
1651                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1652         }
1653
1654         gettimeofday(&end_tv, NULL);
1655         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1656                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1657         if (stats.flist_buildtime == 0)
1658                 stats.flist_buildtime = 1;
1659         start_tv = end_tv;
1660
1661         write_byte(f, 0); /* Indicate end of file list */
1662
1663 #ifdef SUPPORT_HARD_LINKS
1664         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1665                 idev_destroy();
1666 #endif
1667
1668         if (show_filelist_p())
1669                 finish_filelist_progress(flist);
1670
1671         gettimeofday(&end_tv, NULL);
1672         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1673                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1674
1675         /* Sort the list without removing any duplicates in non-incremental
1676          * mode.  This allows the receiving side to ask for whatever name it
1677          * kept.  For incremental mode, the sender also removes duplicates
1678          * in this initial file-list so that it avoids re-sending duplicated
1679          * directories. */
1680         clean_flist(flist, 0, inc_recurse);
1681         file_total += flist->count;
1682
1683         if (!numeric_ids && !inc_recurse)
1684                 send_uid_list(f);
1685
1686         /* send the io_error flag */
1687         if (protocol_version < 30)
1688                 write_int(f, ignore_errors ? 0 : io_error);
1689         else if (io_error && !ignore_errors)
1690                 send_msg_int(MSG_IO_ERROR, io_error);
1691
1692         if (disable_buffering)
1693                 io_end_buffering_out();
1694
1695         stats.flist_size = stats.total_written - start_write;
1696         stats.num_files = flist->count;
1697
1698         if (verbose > 3)
1699                 output_flist(flist);
1700
1701         if (verbose > 2)
1702                 rprintf(FINFO, "send_file_list done\n");
1703
1704         if (inc_recurse) {
1705                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1706                 if (send_dir_ndx < 0) {
1707                         write_ndx(f, NDX_FLIST_EOF);
1708                         flist_eof = 1;
1709                 }
1710                 else if (file_total == 1) {
1711                         /* If we're creating incremental file-lists and there
1712                          * was just 1 item in the first file-list, send 1 more
1713                          * file-list to check if this is a 1-file xfer. */
1714                         send_extra_file_list(f, 1);
1715                 }
1716         }
1717
1718         return flist;
1719 }
1720
1721 struct file_list *recv_file_list(int f)
1722 {
1723         struct file_list *flist;
1724         int dstart, flags;
1725         int64 start_read;
1726
1727         if (!first_flist)
1728                 rprintf(FLOG, "receiving file list\n");
1729         if (show_filelist_p())
1730                 start_filelist_progress("receiving file list");
1731         else if (inc_recurse && verbose && !am_server && !first_flist)
1732                 rprintf(FCLIENT, "receiving incremental file list\n");
1733
1734         start_read = stats.total_read;
1735
1736         flist = flist_new(0, "recv_file_list");
1737
1738 #ifdef SUPPORT_HARD_LINKS
1739         if (preserve_hard_links && protocol_version < 30)
1740                 init_hard_links();
1741 #endif
1742
1743         if (inc_recurse) {
1744                 if (flist->ndx_start == 0)
1745                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1746                 dstart = dir_flist->count;
1747         } else {
1748                 dir_flist = flist;
1749                 dstart = 0;
1750         }
1751
1752         while ((flags = read_byte(f)) != 0) {
1753                 struct file_struct *file;
1754
1755                 flist_expand(flist);
1756
1757                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1758                         flags |= read_byte(f) << 8;
1759                 file = recv_file_entry(flist, flags, f);
1760
1761                 if (inc_recurse && S_ISDIR(file->mode)) {
1762                         flist_expand(dir_flist);
1763                         dir_flist->files[dir_flist->count++] = file;
1764                 }
1765
1766                 flist->files[flist->count++] = file;
1767
1768                 maybe_emit_filelist_progress(flist->count);
1769
1770                 if (verbose > 2) {
1771                         rprintf(FINFO, "recv_file_name(%s)\n",
1772                                 f_name(file, NULL));
1773                 }
1774         }
1775         file_total += flist->count;
1776
1777         if (verbose > 2)
1778                 rprintf(FINFO, "received %d names\n", flist->count);
1779
1780         if (show_filelist_p())
1781                 finish_filelist_progress(flist);
1782
1783         clean_flist(flist, relative_paths, 1);
1784
1785         if (inc_recurse) {
1786                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1787                       sizeof dir_flist->files[0], (int (*)())file_compare);
1788         } else if (f >= 0)
1789                 recv_uid_list(f, flist);
1790
1791         if (protocol_version < 30) {
1792                 /* Recv the io_error flag */
1793                 if (ignore_errors)
1794                         read_int(f);
1795                 else
1796                         io_error |= read_int(f);
1797         }
1798
1799         if (verbose > 3)
1800                 output_flist(flist);
1801
1802         if (list_only) {
1803                 int i;
1804                 for (i = 0; i < flist->count; i++)
1805                         list_file_entry(flist->files[i]);
1806         }
1807
1808         if (verbose > 2)
1809                 rprintf(FINFO, "recv_file_list done\n");
1810
1811         stats.flist_size += stats.total_read - start_read;
1812         stats.num_files += flist->count;
1813
1814         return flist;
1815 }
1816
1817 /* This is only used once by the receiver if the very first file-list
1818  * has exactly one item in it. */
1819 void recv_additional_file_list(int f)
1820 {
1821         struct file_list *flist;
1822         int ndx = read_ndx(f);
1823         if (ndx == NDX_FLIST_EOF) {
1824                 flist_eof = 1;
1825                 change_local_filter_dir(NULL, 0, 0);
1826         } else {
1827                 ndx = NDX_FLIST_OFFSET - ndx;
1828                 if (ndx < 0 || ndx >= dir_flist->count) {
1829                         ndx = NDX_FLIST_OFFSET - ndx;
1830                         rprintf(FERROR,
1831                                 "Invalid dir index: %d (%d - %d)\n",
1832                                 ndx, NDX_FLIST_OFFSET,
1833                                 NDX_FLIST_OFFSET - dir_flist->count);
1834                         exit_cleanup(RERR_PROTOCOL);
1835                 }
1836                 flist = recv_file_list(f);
1837                 flist->parent_ndx = ndx;
1838         }
1839 }
1840
1841 /* Search for an identically-named item in the file list.  Note that the
1842  * items must agree in their directory-ness, or no match is returned. */
1843 int flist_find(struct file_list *flist, struct file_struct *f)
1844 {
1845         int low = flist->low, high = flist->high;
1846         int diff, mid, mid_up;
1847
1848         while (low <= high) {
1849                 mid = (low + high) / 2;
1850                 if (F_IS_ACTIVE(flist->files[mid]))
1851                         mid_up = mid;
1852                 else {
1853                         /* Scan for the next non-empty entry using the cached
1854                          * distance values.  If the value isn't fully up-to-
1855                          * date, update it. */
1856                         mid_up = mid + F_DEPTH(flist->files[mid]);
1857                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1858                                 do {
1859                                     mid_up += F_DEPTH(flist->files[mid_up]);
1860                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1861                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1862                         }
1863                         if (mid_up > high) {
1864                                 /* If there's nothing left above us, set high to
1865                                  * a non-empty entry below us and continue. */
1866                                 high = mid - (int)flist->files[mid]->len32;
1867                                 if (!F_IS_ACTIVE(flist->files[high])) {
1868                                         do {
1869                                             high -= (int)flist->files[high]->len32;
1870                                         } while (!F_IS_ACTIVE(flist->files[high]));
1871                                         flist->files[mid]->len32 = mid - high;
1872                                 }
1873                                 continue;
1874                         }
1875                 }
1876                 diff = f_name_cmp(flist->files[mid_up], f);
1877                 if (diff == 0) {
1878                         if (protocol_version < 29
1879                             && S_ISDIR(flist->files[mid_up]->mode)
1880                             != S_ISDIR(f->mode))
1881                                 return -1;
1882                         return mid_up;
1883                 }
1884                 if (diff < 0)
1885                         low = mid_up + 1;
1886                 else
1887                         high = mid - 1;
1888         }
1889         return -1;
1890 }
1891
1892 /*
1893  * Free up any resources a file_struct has allocated
1894  * and clear the file.
1895  */
1896 void clear_file(struct file_struct *file)
1897 {
1898         /* The +1 zeros out the first char of the basename. */
1899         memset(file, 0, FILE_STRUCT_LEN + 1);
1900         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1901          * entry.  Likewise for len32 in the opposite direction.  We assume
1902          * that we're alone for now since flist_find() will adjust the counts
1903          * it runs into that aren't up-to-date. */
1904         file->len32 = F_DEPTH(file) = 1;
1905 }
1906
1907 /* Allocate a new file list. */
1908 struct file_list *flist_new(int flags, char *msg)
1909 {
1910         struct file_list *flist;
1911
1912         flist = new(struct file_list);
1913         if (!flist)
1914                 out_of_memory(msg);
1915
1916         memset(flist, 0, sizeof flist[0]);
1917
1918         if (!(flags & FLIST_TEMP)) {
1919                 if (first_flist) {
1920                         flist->ndx_start = first_flist->prev->ndx_start
1921                                          + first_flist->prev->count;
1922                 }
1923                 /* This is a doubly linked list with prev looping back to
1924                  * the end of the list, but the last next pointer is NULL. */
1925                 if (!first_flist)
1926                         first_flist = cur_flist = flist->prev = flist;
1927                 else {
1928                         flist->prev = first_flist->prev;
1929                         flist->prev->next = first_flist->prev = flist;
1930                 }
1931                 flist_cnt++;
1932         }
1933
1934         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1935                 out_of_memory(msg);
1936
1937         return flist;
1938 }
1939
1940 /* Free up all elements in a flist. */
1941 void flist_free(struct file_list *flist)
1942 {
1943         if (!flist->prev)
1944                 ; /* Was FLIST_TEMP dir-list. */
1945         else if (flist == flist->prev) {
1946                 first_flist = cur_flist = NULL;
1947                 file_total = 0;
1948                 flist_cnt = 0;
1949         } else {
1950                 if (flist == cur_flist)
1951                         cur_flist = flist->next;
1952                 if (flist == first_flist)
1953                         first_flist = first_flist->next;
1954                 else {
1955                         flist->prev->next = flist->next;
1956                         if (!flist->next)
1957                                 flist->next = first_flist;
1958                 }
1959                 flist->next->prev = flist->prev;
1960                 file_total -= flist->count;
1961                 flist_cnt--;
1962         }
1963
1964         pool_destroy(flist->file_pool);
1965         free(flist->files);
1966         free(flist);
1967 }
1968
1969 /*
1970  * This routine ensures we don't have any duplicate names in our file list.
1971  * duplicate names can cause corruption because of the pipelining
1972  */
1973 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1974 {
1975         char fbuf[MAXPATHLEN];
1976         int i, prev_i = 0;
1977
1978         if (!flist)
1979                 return;
1980         if (flist->count == 0) {
1981                 flist->high = -1;
1982                 return;
1983         }
1984
1985         qsort(flist->files, flist->count,
1986             sizeof flist->files[0], (int (*)())file_compare);
1987
1988         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1989                 if (F_IS_ACTIVE(flist->files[i])) {
1990                         prev_i = i;
1991                         break;
1992                 }
1993         }
1994         flist->low = prev_i;
1995         while (++i < flist->count) {
1996                 int j;
1997                 struct file_struct *file = flist->files[i];
1998
1999                 if (!F_IS_ACTIVE(file))
2000                         continue;
2001                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
2002                         j = prev_i;
2003                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2004                         int save_mode = file->mode;
2005                         /* Make sure that this directory doesn't duplicate a
2006                          * non-directory earlier in the list. */
2007                         flist->high = prev_i;
2008                         file->mode = S_IFREG;
2009                         j = flist_find(flist, file);
2010                         file->mode = save_mode;
2011                 } else
2012                         j = -1;
2013                 if (j >= 0) {
2014                         struct file_struct *fp = flist->files[j];
2015                         int keep, drop;
2016                         /* If one is a dir and the other is not, we want to
2017                          * keep the dir because it might have contents in the
2018                          * list. */
2019                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
2020                                 if (S_ISDIR(file->mode))
2021                                         keep = i, drop = j;
2022                                 else
2023                                         keep = j, drop = i;
2024                         } else if (protocol_version < 27)
2025                                 keep = j, drop = i;
2026                         else
2027                                 keep = i, drop = j;
2028                         if (verbose > 1 && !am_server) {
2029                                 rprintf(FINFO,
2030                                         "removing duplicate name %s from file list (%d)\n",
2031                                         f_name(file, fbuf), drop);
2032                         }
2033                         /* Make sure we don't lose track of a user-specified
2034                          * top directory. */
2035                         flist->files[keep]->flags |= flist->files[drop]->flags
2036                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
2037
2038                         clear_file(flist->files[drop]);
2039
2040                         if (keep == i) {
2041                                 if (flist->low == drop) {
2042                                         for (j = drop + 1;
2043                                              j < i && !F_IS_ACTIVE(flist->files[j]);
2044                                              j++) {}
2045                                         flist->low = j;
2046                                 }
2047                                 prev_i = i;
2048                         }
2049                 } else
2050                         prev_i = i;
2051         }
2052         flist->high = no_dups ? prev_i : flist->count - 1;
2053
2054         if (strip_root) {
2055                 /* We need to strip off the leading slashes for relative
2056                  * paths, but this must be done _after_ the sorting phase. */
2057                 for (i = flist->low; i <= flist->high; i++) {
2058                         struct file_struct *file = flist->files[i];
2059
2060                         if (!file->dirname)
2061                                 continue;
2062                         while (*file->dirname == '/')
2063                                 file->dirname++;
2064                         if (!*file->dirname)
2065                                 file->dirname = NULL;
2066                 }
2067         }
2068
2069         if (prune_empty_dirs && no_dups) {
2070                 int j, prev_depth = 0;
2071
2072                 prev_i = 0; /* It's OK that this isn't really true. */
2073
2074                 for (i = flist->low; i <= flist->high; i++) {
2075                         struct file_struct *fp, *file = flist->files[i];
2076
2077                         /* This temporarily abuses the F_DEPTH() value for a
2078                          * directory that is in a chain that might get pruned.
2079                          * We restore the old value if it gets a reprieve. */
2080                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2081                                 /* Dump empty dirs when coming back down. */
2082                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2083                                         fp = flist->files[prev_i];
2084                                         if (F_DEPTH(fp) >= 0)
2085                                                 break;
2086                                         prev_i = -F_DEPTH(fp)-1;
2087                                         clear_file(fp);
2088                                 }
2089                                 prev_depth = F_DEPTH(file);
2090                                 if (is_excluded(f_name(file, fbuf), 1,
2091                                                        ALL_FILTERS)) {
2092                                         /* Keep dirs through this dir. */
2093                                         for (j = prev_depth-1; ; j--) {
2094                                                 fp = flist->files[prev_i];
2095                                                 if (F_DEPTH(fp) >= 0)
2096                                                         break;
2097                                                 prev_i = -F_DEPTH(fp)-1;
2098                                                 F_DEPTH(fp) = j;
2099                                         }
2100                                 } else
2101                                         F_DEPTH(file) = -prev_i-1;
2102                                 prev_i = i;
2103                         } else {
2104                                 /* Keep dirs through this non-dir. */
2105                                 for (j = prev_depth; ; j--) {
2106                                         fp = flist->files[prev_i];
2107                                         if (F_DEPTH(fp) >= 0)
2108                                                 break;
2109                                         prev_i = -F_DEPTH(fp)-1;
2110                                         F_DEPTH(fp) = j;
2111                                 }
2112                         }
2113                 }
2114                 /* Dump all remaining empty dirs. */
2115                 while (1) {
2116                         struct file_struct *fp = flist->files[prev_i];
2117                         if (F_DEPTH(fp) >= 0)
2118                                 break;
2119                         prev_i = -F_DEPTH(fp)-1;
2120                         clear_file(fp);
2121                 }
2122
2123                 for (i = flist->low; i <= flist->high; i++) {
2124                         if (F_IS_ACTIVE(flist->files[i]))
2125                                 break;
2126                 }
2127                 flist->low = i;
2128                 for (i = flist->high; i >= flist->low; i--) {
2129                         if (F_IS_ACTIVE(flist->files[i]))
2130                                 break;
2131                 }
2132                 flist->high = i;
2133         }
2134 }
2135
2136 static void output_flist(struct file_list *flist)
2137 {
2138         char uidbuf[16], gidbuf[16], depthbuf[16];
2139         struct file_struct *file;
2140         const char *root, *dir, *slash, *name, *trail;
2141         const char *who = who_am_i();
2142         int i;
2143
2144         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2145                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2146         for (i = 0; i < flist->count; i++) {
2147                 file = flist->files[i];
2148                 if ((am_root || am_sender) && preserve_uid) {
2149                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2150                                  (long)F_UID(file));
2151                 } else
2152                         *uidbuf = '\0';
2153                 if (preserve_gid && F_GID(file) != GID_NONE) {
2154                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2155                                  (long)F_GID(file));
2156                 } else
2157                         *gidbuf = '\0';
2158                 if (!am_sender)
2159                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2160                 if (F_IS_ACTIVE(file)) {
2161                         root = am_sender ? NS(F_ROOTDIR(file)) : depthbuf;
2162                         if ((dir = file->dirname) == NULL)
2163                                 dir = slash = "";
2164                         else
2165                                 slash = "/";
2166                         name = file->basename;
2167                         trail = S_ISDIR(file->mode) ? "/" : "";
2168                 } else
2169                         root = dir = slash = name = trail = "";
2170                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2171                         who, i, root, dir, slash, name, trail, (int)file->mode,
2172                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2173         }
2174 }
2175
2176 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2177 enum fnc_type { t_PATH, t_ITEM };
2178
2179 /* Compare the names of two file_struct entities, similar to how strcmp()
2180  * would do if it were operating on the joined strings.
2181  *
2182  * Some differences beginning with protocol_version 29: (1) directory names
2183  * are compared with an assumed trailing slash so that they compare in a
2184  * way that would cause them to sort immediately prior to any content they
2185  * may have; (2) a directory of any name compares after a non-directory of
2186  * any name at the same depth; (3) a directory with name "." compares prior
2187  * to anything else.  These changes mean that a directory and a non-dir
2188  * with the same name will not compare as equal (protocol_version >= 29).
2189  *
2190  * The dirname component can be an empty string, but the basename component
2191  * cannot (and never is in the current codebase).  The basename component
2192  * may be NULL (for a removed item), in which case it is considered to be
2193  * after any existing item. */
2194 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2195 {
2196         int dif;
2197         const uchar *c1, *c2;
2198         enum fnc_state state1, state2;
2199         enum fnc_type type1, type2;
2200         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2201
2202         if (!f1 || !F_IS_ACTIVE(f1)) {
2203                 if (!f2 || !F_IS_ACTIVE(f2))
2204                         return 0;
2205                 return -1;
2206         }
2207         if (!f2 || !F_IS_ACTIVE(f2))
2208                 return 1;
2209
2210         c1 = (uchar*)f1->dirname;
2211         c2 = (uchar*)f2->dirname;
2212         if (c1 == c2)
2213                 c1 = c2 = NULL;
2214         if (!c1) {
2215                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2216                 c1 = (const uchar*)f1->basename;
2217                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2218                         type1 = t_ITEM;
2219                         state1 = s_TRAILING;
2220                         c1 = (uchar*)"";
2221                 } else
2222                         state1 = s_BASE;
2223         } else {
2224                 type1 = t_path;
2225                 state1 = s_DIR;
2226         }
2227         if (!c2) {
2228                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2229                 c2 = (const uchar*)f2->basename;
2230                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2231                         type2 = t_ITEM;
2232                         state2 = s_TRAILING;
2233                         c2 = (uchar*)"";
2234                 } else
2235                         state2 = s_BASE;
2236         } else {
2237                 type2 = t_path;
2238                 state2 = s_DIR;
2239         }
2240
2241         if (type1 != type2)
2242                 return type1 == t_PATH ? 1 : -1;
2243
2244         do {
2245                 if (!*c1) {
2246                         switch (state1) {
2247                         case s_DIR:
2248                                 state1 = s_SLASH;
2249                                 c1 = (uchar*)"/";
2250                                 break;
2251                         case s_SLASH:
2252                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2253                                 c1 = (const uchar*)f1->basename;
2254                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2255                                         type1 = t_ITEM;
2256                                         state1 = s_TRAILING;
2257                                         c1 = (uchar*)"";
2258                                 } else
2259                                         state1 = s_BASE;
2260                                 break;
2261                         case s_BASE:
2262                                 state1 = s_TRAILING;
2263                                 if (type1 == t_PATH) {
2264                                         c1 = (uchar*)"/";
2265                                         break;
2266                                 }
2267                                 /* FALL THROUGH */
2268                         case s_TRAILING:
2269                                 type1 = t_ITEM;
2270                                 break;
2271                         }
2272                         if (*c2 && type1 != type2)
2273                                 return type1 == t_PATH ? 1 : -1;
2274                 }
2275                 if (!*c2) {
2276                         switch (state2) {
2277                         case s_DIR:
2278                                 state2 = s_SLASH;
2279                                 c2 = (uchar*)"/";
2280                                 break;
2281                         case s_SLASH:
2282                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2283                                 c2 = (const uchar*)f2->basename;
2284                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2285                                         type2 = t_ITEM;
2286                                         state2 = s_TRAILING;
2287                                         c2 = (uchar*)"";
2288                                 } else
2289                                         state2 = s_BASE;
2290                                 break;
2291                         case s_BASE:
2292                                 state2 = s_TRAILING;
2293                                 if (type2 == t_PATH) {
2294                                         c2 = (uchar*)"/";
2295                                         break;
2296                                 }
2297                                 /* FALL THROUGH */
2298                         case s_TRAILING:
2299                                 if (!*c1)
2300                                         return 0;
2301                                 type2 = t_ITEM;
2302                                 break;
2303                         }
2304                         if (type1 != type2)
2305                                 return type1 == t_PATH ? 1 : -1;
2306                 }
2307         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2308
2309         return dif;
2310 }
2311
2312 char *f_name_buf(void)
2313 {
2314         static char names[5][MAXPATHLEN];
2315         static unsigned int n;
2316
2317         n = (n + 1) % (sizeof names / sizeof names[0]);
2318
2319         return names[n];
2320 }
2321
2322 /* Return a copy of the full filename of a flist entry, using the indicated
2323  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2324  * done because we checked the size when creating the file_struct entry.
2325  */
2326 char *f_name(struct file_struct *f, char *fbuf)
2327 {
2328         if (!f || !F_IS_ACTIVE(f))
2329                 return NULL;
2330
2331         if (!fbuf)
2332                 fbuf = f_name_buf();
2333
2334         if (f->dirname) {
2335                 int len = strlen(f->dirname);
2336                 memcpy(fbuf, f->dirname, len);
2337                 fbuf[len] = '/';
2338                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2339         } else
2340                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2341
2342         return fbuf;
2343 }
2344
2345 /* Do a non-recursive scan of the named directory, possibly ignoring all
2346  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2347  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2348  * buffer (the functions we call will append names onto the end, but the old
2349  * dir value will be restored on exit). */
2350 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2351 {
2352         struct file_list *dirlist;
2353         char dirbuf[MAXPATHLEN];
2354         int save_recurse = recurse;
2355         int save_xfer_dirs = xfer_dirs;
2356
2357         if (dlen < 0) {
2358                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2359                 if (dlen >= MAXPATHLEN)
2360                         return NULL;
2361                 dirname = dirbuf;
2362         }
2363
2364         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2365
2366         recurse = 0;
2367         xfer_dirs = 1;
2368         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2369         xfer_dirs = save_xfer_dirs;
2370         recurse = save_recurse;
2371         if (do_progress)
2372                 flist_count_offset += dirlist->count;
2373
2374         clean_flist(dirlist, 0, 0);
2375
2376         if (verbose > 3)
2377                 output_flist(dirlist);
2378
2379         return dirlist;
2380 }