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 inc_recurse;
  34 extern int do_progress;
  35 extern int always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38 extern int numeric_ids;
  39 extern int recurse;
  40 extern int xfer_dirs;
  41 extern int filesfrom_fd;
  42 extern int one_file_system;
  43 extern int copy_dirlinks;
  44 extern int keep_dirlinks;
  45 extern int preserve_acls;
  46 extern int preserve_xattrs;
  47 extern int preserve_links;
  48 extern int preserve_hard_links;
  49 extern int preserve_devices;
  50 extern int preserve_specials;
  51 extern int preserve_uid;
  52 extern int preserve_gid;
  53 extern int relative_paths;
  54 extern int implied_dirs;
  55 extern int file_extra_cnt;
  56 extern int ignore_perishable;
  57 extern int non_perishable_cnt;
  58 extern int prune_empty_dirs;
  59 extern int copy_links;
  60 extern int copy_unsafe_links;
  61 extern int protocol_version;
  62 extern int sanitize_paths;
  63 extern struct stats stats;
  64
  65 extern char curr_dir[MAXPATHLEN];
  66
  67 extern struct chmod_mode_struct *chmod_modes;
  68
  69 extern struct filter_list_struct filter_list;
  70 extern struct filter_list_struct server_filter_list;
  71
  72 int io_error;
  73 int checksum_len;
  74 dev_t filesystem_dev; /* used to implement -x */
  75
  76 struct file_list *cur_flist, *first_flist, *dir_flist;
  77 int send_dir_ndx = -1, send_dir_depth = 0;
  78 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  79 int file_total = 0; /* total of all active items over all file-lists */
  80 int flist_eof = 0; /* all the file-lists are now known */
  81
  82 /* The tmp_* vars are used as a cache area by make_file() to store data
  83  * that the sender doesn't need to remember in its file list.  The data
  84  * will survive just long enough to be used by send_file_entry(). */
  85 static dev_t tmp_rdev;
  86 #ifdef SUPPORT_HARD_LINKS
  87 static int64 tmp_dev, tmp_ino;
  88 #endif
  89 static char tmp_sum[MAX_DIGEST_LEN];
  90
  91 static char empty_sum[MAX_DIGEST_LEN];
  92 static int flist_count_offset; /* for --delete --progress */
  93
  94 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  95 static void output_flist(struct file_list *flist);
  96
  97 void init_flist(void)
  98 {
  99         if (verbose > 4) {
 100                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 101                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 102         }
 103         checksum_len = protocol_version < 21 ? 2
 104                      : protocol_version < 30 ? MD4_DIGEST_LEN
 105                      : MD5_DIGEST_LEN;
 106 }
 107
 108 static int show_filelist_p(void)
 109 {
 110         return verbose && xfer_dirs && !am_server && !inc_recurse;
 111 }
 112
 113 static void start_filelist_progress(char *kind)
 114 {
 115         rprintf(FCLIENT, "%s ... ", kind);
 116         if (verbose > 1 || do_progress)
 117                 rprintf(FCLIENT, "\n");
 118         rflush(FINFO);
 119 }
 120
 121 static void emit_filelist_progress(int count)
 122 {
 123         rprintf(FCLIENT, " %d files...\r", count);
 124 }
 125
 126 static void maybe_emit_filelist_progress(int count)
 127 {
 128         if (do_progress && show_filelist_p() && (count % 100) == 0)
 129                 emit_filelist_progress(count);
 130 }
 131
 132 static void finish_filelist_progress(const struct file_list *flist)
 133 {
 134         if (do_progress) {
 135                 /* This overwrites the progress line */
 136                 rprintf(FINFO, "%d file%sto consider\n",
 137                         flist->count, flist->count == 1 ? " " : "s ");
 138         } else
 139                 rprintf(FINFO, "done\n");
 140 }
 141
 142 void show_flist_stats(void)
 143 {
 144         /* Nothing yet */
 145 }
 146
 147 static void list_file_entry(struct file_struct *f)
 148 {
 149         char permbuf[PERMSTRING_SIZE];
 150         double len;
 151
 152         if (!F_IS_ACTIVE(f)) {
 153                 /* this can happen if duplicate names were removed */
 154                 return;
 155         }
 156
 157         permstring(permbuf, f->mode);
 158         len = F_LENGTH(f);
 159
 160         /* TODO: indicate '+' if the entry has an ACL. */
 161
 162 #ifdef SUPPORT_LINKS
 163         if (preserve_links && S_ISLNK(f->mode)) {
 164                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 165                         permbuf, len, timestring(f->modtime),
 166                         f_name(f, NULL), F_SYMLINK(f));
 167         } else
 168 #endif
 169         {
 170                 rprintf(FINFO, "%s %11.0f %s %s\n",
 171                         permbuf, len, timestring(f->modtime),
 172                         f_name(f, NULL));
 173         }
 174 }
 175
 176 /* Stat either a symlink or its referent, depending on the settings of
 177  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 178  *
 179  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 180  * MAXPATHLEN chars) will be set to the symlink's target string.
 181  *
 182  * The stat structure pointed to by stp will contain information about the
 183  * link or the referent as appropriate, if they exist. */
 184 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 185 {
 186 #ifdef SUPPORT_LINKS
 187         if (link_stat(path, stp, copy_dirlinks) < 0)
 188                 return -1;
 189         if (S_ISLNK(stp->st_mode)) {
 190                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 191                 if (llen < 0)
 192                         return -1;
 193                 linkbuf[llen] = '\0';
 194                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 195                         if (verbose > 1) {
 196                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 197                                         path, linkbuf);
 198                         }
 199                         return do_stat(path, stp);
 200                 }
 201         }
 202         return 0;
 203 #else
 204         return do_stat(path, stp);
 205 #endif
 206 }
 207
 208 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 209 {
 210 #ifdef SUPPORT_LINKS
 211         if (copy_links)
 212                 return do_stat(path, stp);
 213         if (do_lstat(path, stp) < 0)
 214                 return -1;
 215         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 216                 STRUCT_STAT st;
 217                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 218                         *stp = st;
 219         }
 220         return 0;
 221 #else
 222         return do_stat(path, stp);
 223 #endif
 224 }
 225
 226 /* This function is used to check if a file should be included/excluded
 227  * from the list of files based on its name and type etc.  The value of
 228  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 229 static int is_excluded(char *fname, int is_dir, int filter_level)
 230 {
 231 #if 0 /* This currently never happens, so avoid a useless compare. */
 232         if (filter_level == NO_FILTERS)
 233                 return 0;
 234 #endif
 235         if (fname) {
 236                 /* never exclude '.', even if somebody does --exclude '*' */
 237                 if (fname[0] == '.' && !fname[1])
 238                         return 0;
 239                 /* Handle the -R version of the '.' dir. */
 240                 if (fname[0] == '/') {
 241                         int len = strlen(fname);
 242                         if (fname[len-1] == '.' && fname[len-2] == '/')
 243                                 return 0;
 244                 }
 245         }
 246         if (server_filter_list.head
 247             && check_filter(&server_filter_list, fname, is_dir) < 0)
 248                 return 1;
 249         if (filter_level != ALL_FILTERS)
 250                 return 0;
 251         if (filter_list.head
 252             && check_filter(&filter_list, fname, is_dir) < 0)
 253                 return 1;
 254         return 0;
 255 }
 256
 257 static int to_wire_mode(mode_t mode)
 258 {
 259 #ifdef SUPPORT_LINKS
 260 #if _S_IFLNK != 0120000
 261         if (S_ISLNK(mode))
 262                 return (mode & ~(_S_IFMT)) | 0120000;
 263 #endif
 264 #endif
 265         return mode;
 266 }
 267
 268 static mode_t from_wire_mode(int mode)
 269 {
 270 #if _S_IFLNK != 0120000
 271         if ((mode & (_S_IFMT)) == 0120000)
 272                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 273 #endif
 274         return mode;
 275 }
 276
 277 static void send_directory(int f, struct file_list *flist, int ndx,
 278                            char *fbuf, int len, int flags);
 279
 280 static const char *flist_dir, *orig_dir;
 281 static int flist_dir_len;
 282
 283
 284 /**
 285  * Make sure @p flist is big enough to hold at least @p flist->count
 286  * entries.
 287  **/
 288 void flist_expand(struct file_list *flist)
 289 {
 290         struct file_struct **new_ptr;
 291
 292         if (flist->count < flist->malloced)
 293                 return;
 294
 295         if (flist->malloced < FLIST_START)
 296                 flist->malloced = FLIST_START;
 297         else if (flist->malloced >= FLIST_LINEAR)
 298                 flist->malloced += FLIST_LINEAR;
 299         else
 300                 flist->malloced *= 2;
 301
 302         /*
 303          * In case count jumped or we are starting the list
 304          * with a known size just set it.
 305          */
 306         if (flist->malloced < flist->count)
 307                 flist->malloced = flist->count;
 308
 309         new_ptr = realloc_array(flist->files, struct file_struct *,
 310                                 flist->malloced);
 311
 312         if (verbose >= 2 && flist->malloced != FLIST_START) {
 313                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
 314                     who_am_i(),
 315                     (double)sizeof flist->files[0] * flist->malloced,
 316                     (new_ptr == flist->files) ? " not" : "");
 317         }
 318
 319         flist->files = new_ptr;
 320
 321         if (!flist->files)
 322                 out_of_memory("flist_expand");
 323 }
 324
 325 int push_flist_dir(const char *dir, int len)
 326 {
 327         if (dir == flist_dir)
 328                 return 1;
 329
 330         if (!orig_dir)
 331                 orig_dir = strdup(curr_dir);
 332
 333         if (flist_dir && !pop_dir(orig_dir)) {
 334                 rsyserr(FERROR, errno, "pop_dir %s failed",
 335                         full_fname(orig_dir));
 336                 exit_cleanup(RERR_FILESELECT);
 337         }
 338
 339         if (dir && !push_dir(dir, 0)) {
 340                 io_error |= IOERR_GENERAL;
 341                 rsyserr(FERROR, errno, "push_dir %s failed in %s",
 342                         full_fname(dir), curr_dir);
 343                 return 0;
 344         }
 345
 346         flist_dir = dir;
 347         flist_dir_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 348
 349         return 1;
 350 }
 351
 352 static void send_file_entry(int f, struct file_struct *file, int ndx)
 353 {
 354         static time_t modtime;
 355         static mode_t mode;
 356         static int64 dev;
 357         static dev_t rdev;
 358         static uint32 rdev_major;
 359         static uid_t uid;
 360         static gid_t gid;
 361         static char *user_name, *group_name;
 362         static char lastname[MAXPATHLEN];
 363         char fname[MAXPATHLEN];
 364         int first_hlink_ndx = -1;
 365         int l1, l2;
 366         int flags;
 367
 368         f_name(file, fname);
 369
 370         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 371
 372         if (file->mode == mode)
 373                 flags |= XMIT_SAME_MODE;
 374         else
 375                 mode = file->mode;
 376         if ((preserve_devices && IS_DEVICE(mode))
 377          || (preserve_specials && IS_SPECIAL(mode))) {
 378                 if (protocol_version < 28) {
 379                         if (tmp_rdev == rdev)
 380                                 flags |= XMIT_SAME_RDEV_pre28;
 381                         else
 382                                 rdev = tmp_rdev;
 383                 } else {
 384                         rdev = tmp_rdev;
 385                         if ((uint32)major(rdev) == rdev_major)
 386                                 flags |= XMIT_SAME_RDEV_MAJOR;
 387                         else
 388                                 rdev_major = major(rdev);
 389                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 390                                 flags |= XMIT_RDEV_MINOR_8_pre30;
 391                 }
 392         } else if (protocol_version < 28)
 393                 rdev = MAKEDEV(0, 0);
 394         if (preserve_uid) {
 395                 if (F_UID(file) == uid && *lastname)
 396                         flags |= XMIT_SAME_UID;
 397                 else {
 398                         uid = F_UID(file);
 399                         if (preserve_uid && !numeric_ids) {
 400                                 user_name = add_uid(uid);
 401                                 if (inc_recurse && user_name)
 402                                         flags |= XMIT_USER_NAME_FOLLOWS;
 403                         }
 404                 }
 405         }
 406         if (preserve_gid) {
 407                 if (F_GID(file) == gid && *lastname)
 408                         flags |= XMIT_SAME_GID;
 409                 else {
 410                         gid = F_GID(file);
 411                         if (preserve_gid && !numeric_ids) {
 412                                 group_name = add_gid(gid);
 413                                 if (inc_recurse && group_name)
 414                                         flags |= XMIT_GROUP_NAME_FOLLOWS;
 415                         }
 416                 }
 417         }
 418         if (file->modtime == modtime)
 419                 flags |= XMIT_SAME_TIME;
 420         else
 421                 modtime = file->modtime;
 422
 423 #ifdef SUPPORT_HARD_LINKS
 424         if (tmp_dev != 0) {
 425                 if (protocol_version >= 30) {
 426                         struct idev_node *np = idev_node(tmp_dev, tmp_ino);
 427                         first_hlink_ndx = (int32)(long)np->data - 1;
 428                         if (first_hlink_ndx < 0) {
 429                                 np->data = (void*)(long)(ndx + 1);
 430                                 flags |= XMIT_HLINK_FIRST;
 431                         }
 432                         flags |= XMIT_HLINKED;
 433                 } else {
 434                         if (tmp_dev == dev) {
 435                                 if (protocol_version >= 28)
 436                                         flags |= XMIT_SAME_DEV_pre30;
 437                         } else
 438                                 dev = tmp_dev;
 439                         flags |= XMIT_HLINKED;
 440                 }
 441         }
 442 #endif
 443
 444         for (l1 = 0;
 445             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 446             l1++) {}
 447         l2 = strlen(fname+l1);
 448
 449         if (l1 > 0)
 450                 flags |= XMIT_SAME_NAME;
 451         if (l2 > 255)
 452                 flags |= XMIT_LONG_NAME;
 453
 454         /* We must make sure we don't send a zero flag byte or the
 455          * other end will terminate the flist transfer.  Note that
 456          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 457          * it's harmless way to add a bit to the first flag byte. */
 458         if (protocol_version >= 28) {
 459                 if (!flags && !S_ISDIR(mode))
 460                         flags |= XMIT_TOP_DIR;
 461                 if ((flags & 0xFF00) || !flags) {
 462                         flags |= XMIT_EXTENDED_FLAGS;
 463                         write_shortint(f, flags);
 464                 } else
 465                         write_byte(f, flags);
 466         } else {
 467                 if (!(flags & 0xFF))
 468                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 469                 write_byte(f, flags);
 470         }
 471         if (flags & XMIT_SAME_NAME)
 472                 write_byte(f, l1);
 473         if (flags & XMIT_LONG_NAME)
 474                 write_abbrevint30(f, l2);
 475         else
 476                 write_byte(f, l2);
 477         write_buf(f, fname + l1, l2);
 478
 479         if (first_hlink_ndx >= 0) {
 480                 write_abbrevint30(f, first_hlink_ndx);
 481                 goto the_end;
 482         }
 483
 484         write_longint(f, F_LENGTH(file));
 485         if (!(flags & XMIT_SAME_TIME))
 486                 write_int(f, modtime);
 487         if (!(flags & XMIT_SAME_MODE))
 488                 write_int(f, to_wire_mode(mode));
 489         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 490                 if (protocol_version < 30)
 491                         write_int(f, uid);
 492                 else {
 493                         write_abbrevint(f, uid);
 494                         if (flags & XMIT_USER_NAME_FOLLOWS) {
 495                                 int len = strlen(user_name);
 496                                 write_byte(f, len);
 497                                 write_buf(f, user_name, len);
 498                         }
 499                 }
 500         }
 501         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 502                 if (protocol_version < 30)
 503                         write_int(f, gid);
 504                 else {
 505                         write_abbrevint(f, gid);
 506                         if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 507                                 int len = strlen(group_name);
 508                                 write_byte(f, len);
 509                                 write_buf(f, group_name, len);
 510                         }
 511                 }
 512         }
 513         if ((preserve_devices && IS_DEVICE(mode))
 514          || (preserve_specials && IS_SPECIAL(mode))) {
 515                 if (protocol_version < 28) {
 516                         if (!(flags & XMIT_SAME_RDEV_pre28))
 517                                 write_int(f, (int)rdev);
 518                 } else {
 519                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 520                                 write_abbrevint30(f, major(rdev));
 521                         if (protocol_version >= 30)
 522                                 write_abbrevint(f, minor(rdev));
 523                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 524                                 write_byte(f, minor(rdev));
 525                         else
 526                                 write_int(f, minor(rdev));
 527                 }
 528         }
 529
 530 #ifdef SUPPORT_LINKS
 531         if (preserve_links && S_ISLNK(mode)) {
 532                 const char *sl = F_SYMLINK(file);
 533                 int len = strlen(sl);
 534                 write_abbrevint30(f, len);
 535                 write_buf(f, sl, len);
 536         }
 537 #endif
 538
 539 #ifdef SUPPORT_HARD_LINKS
 540         if (tmp_dev != 0 && protocol_version < 30) {
 541                 if (protocol_version < 26) {
 542                         /* 32-bit dev_t and ino_t */
 543                         write_int(f, (int32)dev);
 544                         write_int(f, (int32)tmp_ino);
 545                 } else {
 546                         /* 64-bit dev_t and ino_t */
 547                         if (!(flags & XMIT_SAME_DEV_pre30))
 548                                 write_longint(f, dev);
 549                         write_longint(f, tmp_ino);
 550                 }
 551         }
 552 #endif
 553
 554         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 555                 const char *sum;
 556                 if (S_ISREG(mode))
 557                         sum = tmp_sum;
 558                 else {
 559                         /* Prior to 28, we sent a useless set of nulls. */
 560                         sum = empty_sum;
 561                 }
 562                 write_buf(f, sum, checksum_len);
 563         }
 564
 565   the_end:
 566         strlcpy(lastname, fname, MAXPATHLEN);
 567
 568         if (S_ISREG(mode) || S_ISLNK(mode))
 569                 stats.total_size += F_LENGTH(file);
 570 }
 571
 572 static struct file_struct *recv_file_entry(struct file_list *flist,
 573                                            int flags, int f)
 574 {
 575         static time_t modtime;
 576         static mode_t mode;
 577         static int64 dev;
 578         static dev_t rdev;
 579         static uint32 rdev_major;
 580         static uid_t uid;
 581         static gid_t gid;
 582         static char lastname[MAXPATHLEN], *lastdir;
 583         static int lastdir_depth, lastdir_len = -1;
 584         static unsigned int del_hier_name_len = 0;
 585         static int in_del_hier = 0;
 586         char thisname[MAXPATHLEN];
 587         unsigned int l1 = 0, l2 = 0;
 588         int alloc_len, basename_len, linkname_len;
 589         int extra_len = file_extra_cnt * EXTRA_LEN;
 590         int first_hlink_ndx = -1;
 591         OFF_T file_length;
 592         const char *basename;
 593         char *bp;
 594         struct file_struct *file;
 595
 596         if (flags & XMIT_SAME_NAME)
 597                 l1 = read_byte(f);
 598
 599         if (flags & XMIT_LONG_NAME)
 600                 l2 = read_abbrevint30(f);
 601         else
 602                 l2 = read_byte(f);
 603
 604         if (l2 >= MAXPATHLEN - l1) {
 605                 rprintf(FERROR,
 606                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 607                         flags, l1, l2, lastname, who_am_i());
 608                 overflow_exit("recv_file_entry");
 609         }
 610
 611         strlcpy(thisname, lastname, l1 + 1);
 612         read_sbuf(f, &thisname[l1], l2);
 613         thisname[l1 + l2] = 0;
 614
 615         strlcpy(lastname, thisname, MAXPATHLEN);
 616
 617         clean_fname(thisname, 0);
 618
 619         if (sanitize_paths)
 620                 sanitize_path(thisname, thisname, "", 0, NULL);
 621
 622         if ((basename = strrchr(thisname, '/')) != NULL) {
 623                 int len = basename++ - thisname;
 624                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 625                         lastdir = new_array(char, len + 1);
 626                         memcpy(lastdir, thisname, len);
 627                         lastdir[len] = '\0';
 628                         lastdir_len = len;
 629                         lastdir_depth = count_dir_elements(lastdir);
 630                 }
 631         } else
 632                 basename = thisname;
 633         basename_len = strlen(basename) + 1; /* count the '\0' */
 634
 635 #ifdef SUPPORT_HARD_LINKS
 636         if (protocol_version >= 30
 637          && BITS_SETnUNSET(flags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 638                 struct file_struct *first;
 639                 first_hlink_ndx = read_abbrevint30(f);
 640                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->count) {
 641                         rprintf(FERROR,
 642                                 "hard-link reference out of range: %d (%d)\n",
 643                                 first_hlink_ndx, flist->count);
 644                         exit_cleanup(RERR_PROTOCOL);
 645                 }
 646                 first = flist->files[first_hlink_ndx];
 647                 file_length = F_LENGTH(first);
 648                 modtime = first->modtime;
 649                 mode = first->mode;
 650                 if (preserve_uid)
 651                         uid = F_UID(first);
 652                 if (preserve_gid)
 653                         gid = F_GID(first);
 654                 if ((preserve_devices && IS_DEVICE(mode))
 655                  || (preserve_specials && IS_SPECIAL(mode))) {
 656                         uint32 *devp = F_RDEV_P(first);
 657                         rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 658                         extra_len += 2 * EXTRA_LEN;
 659                 }
 660                 if (preserve_links && S_ISLNK(mode))
 661                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 662                 else
 663                         linkname_len = 0;
 664                 goto create_object;
 665         }
 666 #endif
 667
 668         file_length = read_longint(f);
 669         if (!(flags & XMIT_SAME_TIME))
 670                 modtime = (time_t)read_int(f);
 671         if (!(flags & XMIT_SAME_MODE))
 672                 mode = from_wire_mode(read_int(f));
 673
 674         if (chmod_modes && !S_ISLNK(mode))
 675                 mode = tweak_mode(mode, chmod_modes);
 676
 677         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 678                 if (protocol_version < 30)
 679                         uid = (uid_t)read_int(f);
 680                 else {
 681                         uid = (uid_t)read_abbrevint(f);
 682                         if (flags & XMIT_USER_NAME_FOLLOWS)
 683                                 uid = recv_user_name(f, uid);
 684                         else if (inc_recurse && am_root && !numeric_ids)
 685                                 uid = match_uid(uid);
 686                 }
 687         }
 688         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 689                 if (protocol_version < 30)
 690                         gid = (gid_t)read_int(f);
 691                 else {
 692                         gid = (gid_t)read_abbrevint(f);
 693                         if (flags & XMIT_GROUP_NAME_FOLLOWS)
 694                                 gid = recv_group_name(f, gid);
 695                         else if (inc_recurse && (!am_root || !numeric_ids))
 696                                 gid = match_gid(gid);
 697                 }
 698         }
 699
 700         if ((preserve_devices && IS_DEVICE(mode))
 701          || (preserve_specials && IS_SPECIAL(mode))) {
 702                 if (protocol_version < 28) {
 703                         if (!(flags & XMIT_SAME_RDEV_pre28))
 704                                 rdev = (dev_t)read_int(f);
 705                 } else {
 706                         uint32 rdev_minor;
 707                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 708                                 rdev_major = read_abbrevint30(f);
 709                         if (protocol_version >= 30)
 710                                 rdev_minor = read_abbrevint(f);
 711                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 712                                 rdev_minor = read_byte(f);
 713                         else
 714                                 rdev_minor = read_int(f);
 715                         rdev = MAKEDEV(rdev_major, rdev_minor);
 716                 }
 717                 extra_len += 2 * EXTRA_LEN;
 718                 file_length = 0;
 719         } else if (protocol_version < 28)
 720                 rdev = MAKEDEV(0, 0);
 721
 722 #ifdef SUPPORT_LINKS
 723         if (preserve_links && S_ISLNK(mode)) {
 724                 linkname_len = read_abbrevint30(f) + 1; /* count the '\0' */
 725                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 726                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 727                                 linkname_len - 1);
 728                         overflow_exit("recv_file_entry");
 729                 }
 730         }
 731         else
 732 #endif
 733                 linkname_len = 0;
 734
 735 #ifdef SUPPORT_HARD_LINKS
 736   create_object:
 737         if (preserve_hard_links) {
 738                 if (protocol_version < 28 && S_ISREG(mode))
 739                         flags |= XMIT_HLINKED;
 740                 if (flags & XMIT_HLINKED)
 741                         extra_len += EXTRA_LEN;
 742         }
 743 #endif
 744
 745 #ifdef SUPPORT_ACLS
 746         /* We need one or two index int32s when we're preserving ACLs. */
 747         if (preserve_acls)
 748                 extra_len += (S_ISDIR(mode) ? 2 : 1) * EXTRA_LEN;
 749 #endif
 750
 751         if (always_checksum && S_ISREG(mode))
 752                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 753
 754         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 755                 extra_len += EXTRA_LEN;
 756
 757 #if EXTRA_ROUNDING > 0
 758         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 759                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 760 #endif
 761
 762         if (inc_recurse && S_ISDIR(mode)) {
 763                 if (one_file_system) {
 764                         /* Room to save the dir's device for -x */
 765                         extra_len += 2 * EXTRA_LEN;
 766                 }
 767                 flist = dir_flist;
 768         }
 769
 770         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 771                   + linkname_len;
 772         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
 773
 774         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 775         bp += extra_len;
 776         file = (struct file_struct *)bp;
 777         bp += FILE_STRUCT_LEN;
 778
 779         memcpy(bp, basename, basename_len);
 780         bp += basename_len + linkname_len; /* skip space for symlink too */
 781
 782 #ifdef SUPPORT_HARD_LINKS
 783         if (flags & XMIT_HLINKED)
 784                 file->flags |= FLAG_HLINKED;
 785 #endif
 786         file->modtime = modtime;
 787         file->len32 = (uint32)file_length;
 788         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 789                 file->flags |= FLAG_LENGTH64;
 790                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 791         }
 792         file->mode = mode;
 793         if (preserve_uid)
 794                 F_OWNER(file) = uid;
 795         if (preserve_gid)
 796                 F_GROUP(file) = gid;
 797
 798         if (basename != thisname) {
 799                 file->dirname = lastdir;
 800                 F_DEPTH(file) = lastdir_depth + 1;
 801         } else
 802                 F_DEPTH(file) = 1;
 803
 804         if (S_ISDIR(mode)) {
 805                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 806                         F_DEPTH(file)--;
 807                 if (flags & XMIT_TOP_DIR) {
 808                         in_del_hier = recurse;
 809                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 810                         if (relative_paths && del_hier_name_len > 2
 811                             && lastname[del_hier_name_len-1] == '.'
 812                             && lastname[del_hier_name_len-2] == '/')
 813                                 del_hier_name_len -= 2;
 814                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 815                 } else if (in_del_hier) {
 816                         if (!relative_paths || !del_hier_name_len
 817                          || (l1 >= del_hier_name_len
 818                           && lastname[del_hier_name_len] == '/'))
 819                                 file->flags |= FLAG_XFER_DIR;
 820                         else
 821                                 in_del_hier = 0;
 822                 }
 823         }
 824
 825         if ((preserve_devices && IS_DEVICE(mode))
 826          || (preserve_specials && IS_SPECIAL(mode))) {
 827                 uint32 *devp = F_RDEV_P(file);
 828                 DEV_MAJOR(devp) = major(rdev);
 829                 DEV_MINOR(devp) = minor(rdev);
 830         }
 831
 832 #ifdef SUPPORT_LINKS
 833         if (linkname_len) {
 834                 bp = (char*)file->basename + basename_len;
 835                 if (first_hlink_ndx >= 0) {
 836                         struct file_struct *first = flist->files[first_hlink_ndx];
 837                         memcpy(bp, F_SYMLINK(first), linkname_len);
 838                 } else
 839                         read_sbuf(f, bp, linkname_len - 1);
 840                 if (sanitize_paths)
 841                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 842         }
 843 #endif
 844
 845 #ifdef SUPPORT_HARD_LINKS
 846         if (preserve_hard_links && flags & XMIT_HLINKED) {
 847                 if (protocol_version >= 30) {
 848                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 849                                         ? flist->count : first_hlink_ndx;
 850                 } else {
 851                         static int32 cnt = 0;
 852                         struct idev_node *np;
 853                         int64 ino;
 854                         int32 ndx;
 855                         if (protocol_version < 26) {
 856                                 dev = read_int(f);
 857                                 ino = read_int(f);
 858                         } else {
 859                                 if (!(flags & XMIT_SAME_DEV_pre30))
 860                                         dev = read_longint(f);
 861                                 ino = read_longint(f);
 862                         }
 863                         np = idev_node(dev, ino);
 864                         ndx = (int32)(long)np->data - 1;
 865                         if (ndx < 0) {
 866                                 ndx = cnt++;
 867                                 np->data = (void*)(long)cnt;
 868                         }
 869                         F_HL_GNUM(file) = ndx;
 870                 }
 871         }
 872 #endif
 873
 874         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 875                 if (S_ISREG(mode))
 876                         bp = (char*)F_SUM(file);
 877                 else {
 878                         /* Prior to 28, we get a useless set of nulls. */
 879                         bp = tmp_sum;
 880                 }
 881                 if (first_hlink_ndx >= 0) {
 882                         struct file_struct *first = flist->files[first_hlink_ndx];
 883                         memcpy(bp, F_SUM(first), checksum_len);
 884                 } else
 885                         read_buf(f, bp, checksum_len);
 886         }
 887
 888 #ifdef SUPPORT_ACLS
 889         if (preserve_acls && !S_ISLNK(mode))
 890                 receive_acl(file, f);
 891 #endif
 892 #ifdef SUPPORT_XATTRS
 893         if (preserve_xattrs)
 894                 receive_xattr(file, f );
 895 #endif
 896
 897         if (S_ISREG(mode) || S_ISLNK(mode))
 898                 stats.total_size += file_length;
 899
 900         return file;
 901 }
 902
 903 /**
 904  * Create a file_struct for a named file by reading its stat()
 905  * information and performing extensive checks against global
 906  * options.
 907  *
 908  * @return the new file, or NULL if there was an error or this file
 909  * should be excluded.
 910  *
 911  * @todo There is a small optimization opportunity here to avoid
 912  * stat()ing the file in some circumstances, which has a certain cost.
 913  * We are called immediately after doing readdir(), and so we may
 914  * already know the d_type of the file.  We could for example avoid
 915  * statting directories if we're not recursing, but this is not a very
 916  * important case.  Some systems may not have d_type.
 917  **/
 918 struct file_struct *make_file(const char *fname, struct file_list *flist,
 919                               STRUCT_STAT *stp, int flags, int filter_level)
 920 {
 921         static char *lastdir;
 922         static int lastdir_len = -1;
 923         struct file_struct *file;
 924         STRUCT_STAT st;
 925         char thisname[MAXPATHLEN];
 926         char linkname[MAXPATHLEN];
 927         int alloc_len, basename_len, linkname_len;
 928         int extra_len = file_extra_cnt * EXTRA_LEN;
 929         const char *basename;
 930         char *bp;
 931
 932         if (strlcpy(thisname, fname, sizeof thisname)
 933             >= sizeof thisname - flist_dir_len) {
 934                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 935                 return NULL;
 936         }
 937         clean_fname(thisname, 0);
 938         if (sanitize_paths)
 939                 sanitize_path(thisname, thisname, "", 0, NULL);
 940
 941         if (stp && S_ISDIR(stp->st_mode)) {
 942                 st = *stp; /* Needed for "symlink/." with --relative. */
 943                 *linkname = '\0'; /* make IBM code checker happy */
 944         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 945                 int save_errno = errno;
 946                 /* See if file is excluded before reporting an error. */
 947                 if (filter_level != NO_FILTERS
 948                  && (is_excluded(thisname, 0, filter_level)
 949                   || is_excluded(thisname, 1, filter_level))) {
 950                         if (ignore_perishable && save_errno != ENOENT)
 951                                 non_perishable_cnt++;
 952                         return NULL;
 953                 }
 954                 if (save_errno == ENOENT) {
 955 #ifdef SUPPORT_LINKS
 956                         /* Avoid "vanished" error if symlink points nowhere. */
 957                         if (copy_links && do_lstat(thisname, &st) == 0
 958                             && S_ISLNK(st.st_mode)) {
 959                                 io_error |= IOERR_GENERAL;
 960                                 rprintf(FERROR, "symlink has no referent: %s\n",
 961                                         full_fname(thisname));
 962                         } else
 963 #endif
 964                         {
 965                                 enum logcode c = am_daemon && protocol_version < 28
 966                                     ? FERROR : FINFO;
 967                                 io_error |= IOERR_VANISHED;
 968                                 rprintf(c, "file has vanished: %s\n",
 969                                         full_fname(thisname));
 970                         }
 971                 } else {
 972                         io_error |= IOERR_GENERAL;
 973                         rsyserr(FERROR, save_errno, "readlink %s failed",
 974                                 full_fname(thisname));
 975                 }
 976                 return NULL;
 977         }
 978
 979         /* backup.c calls us with filter_level set to NO_FILTERS. */
 980         if (filter_level == NO_FILTERS)
 981                 goto skip_filters;
 982
 983         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 984                 rprintf(FINFO, "skipping directory %s\n", thisname);
 985                 return NULL;
 986         }
 987
 988         /* -x only affects directories because we need to avoid recursing
 989          * into a mount-point directory, not to avoid copying a symlinked
 990          * file if -L (or similar) was specified. */
 991         if (one_file_system && st.st_dev != filesystem_dev
 992          && S_ISDIR(st.st_mode)) {
 993                 if (one_file_system > 1) {
 994                         if (verbose > 2) {
 995                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 996                                         thisname);
 997                         }
 998                         return NULL;
 999                 }
1000                 flags |= FLAG_MOUNT_DIR;
1001         }
1002
1003         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1004                 if (ignore_perishable)
1005                         non_perishable_cnt++;
1006                 return NULL;
1007         }
1008
1009         if (lp_ignore_nonreadable(module_id)) {
1010 #ifdef SUPPORT_LINKS
1011                 if (!S_ISLNK(st.st_mode))
1012 #endif
1013                         if (access(thisname, R_OK) != 0)
1014                                 return NULL;
1015         }
1016
1017   skip_filters:
1018
1019         /* Only divert a directory in the main transfer. */
1020         if (flist && flist->prev && S_ISDIR(st.st_mode)
1021          && flags & FLAG_DIVERT_DIRS) {
1022                 flist = dir_flist;
1023                 /* Room for parent/sibling/next-child info. */
1024                 extra_len += 3 * EXTRA_LEN;
1025         }
1026
1027         if (verbose > 2) {
1028                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1029                         who_am_i(), thisname, filter_level);
1030         }
1031
1032         if ((basename = strrchr(thisname, '/')) != NULL) {
1033                 int len = basename++ - thisname;
1034                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1035                         lastdir = new_array(char, len + 1);
1036                         memcpy(lastdir, thisname, len);
1037                         lastdir[len] = '\0';
1038                         lastdir_len = len;
1039                 }
1040         } else
1041                 basename = thisname;
1042         basename_len = strlen(basename) + 1; /* count the '\0' */
1043
1044 #ifdef SUPPORT_LINKS
1045         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1046 #else
1047         linkname_len = 0;
1048 #endif
1049
1050         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1051                 extra_len += EXTRA_LEN;
1052
1053 #if EXTRA_ROUNDING > 0
1054         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1055                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1056 #endif
1057
1058         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1059                   + linkname_len;
1060         if (flist)
1061                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1062         else {
1063                 if (!(bp = new_array(char, alloc_len)))
1064                         out_of_memory("make_file");
1065         }
1066
1067         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1068         bp += extra_len;
1069         file = (struct file_struct *)bp;
1070         bp += FILE_STRUCT_LEN;
1071
1072         memcpy(bp, basename, basename_len);
1073         bp += basename_len + linkname_len; /* skip space for symlink too */
1074
1075 #ifdef SUPPORT_HARD_LINKS
1076         if (preserve_hard_links && flist && flist->prev) {
1077                 if (protocol_version >= 28
1078                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1079                  : S_ISREG(st.st_mode)) {
1080                         tmp_dev = st.st_dev;
1081                         tmp_ino = st.st_ino;
1082                 } else
1083                         tmp_dev = 0;
1084         }
1085 #endif
1086
1087 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1088         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1089                 tmp_rdev = st.st_rdev;
1090                 st.st_size = 0;
1091         }
1092 #endif
1093
1094         file->flags = flags;
1095         file->modtime = st.st_mtime;
1096         file->len32 = (uint32)st.st_size;
1097         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1098                 file->flags |= FLAG_LENGTH64;
1099                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1100         }
1101         file->mode = st.st_mode;
1102         if (preserve_uid)
1103                 F_OWNER(file) = st.st_uid;
1104         if (preserve_gid)
1105                 F_GROUP(file) = st.st_gid;
1106
1107         if (basename != thisname)
1108                 file->dirname = lastdir;
1109
1110 #ifdef SUPPORT_LINKS
1111         if (linkname_len) {
1112                 bp = (char*)file->basename + basename_len;
1113                 memcpy(bp, linkname, linkname_len);
1114         }
1115 #endif
1116
1117         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1118                 file_checksum(thisname, tmp_sum, st.st_size);
1119
1120         F_ROOTDIR(file) = flist_dir;
1121
1122         /* This code is only used by the receiver when it is building
1123          * a list of files for a delete pass. */
1124         if (keep_dirlinks && linkname_len && flist) {
1125                 STRUCT_STAT st2;
1126                 int save_mode = file->mode;
1127                 file->mode = S_IFDIR; /* Find a directory with our name. */
1128                 if (flist_find(dir_flist, file) >= 0
1129                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
1130                         file->modtime = st2.st_mtime;
1131                         file->len32 = 0;
1132                         file->mode = st2.st_mode;
1133                         if (preserve_uid)
1134                                 F_OWNER(file) = st2.st_uid;
1135                         if (preserve_gid)
1136                                 F_GROUP(file) = st2.st_gid;
1137                 } else
1138                         file->mode = save_mode;
1139         }
1140
1141         if (basename_len == 0+1)
1142                 return NULL;
1143
1144         if (inc_recurse && flist == dir_flist) {
1145                 flist_expand(flist);
1146                 flist->files[flist->count++] = file;
1147         }
1148
1149         return file;
1150 }
1151
1152 /* Only called for temporary file_struct entries created by make_file(). */
1153 void unmake_file(struct file_struct *file)
1154 {
1155         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1156 #if EXTRA_ROUNDING > 0
1157         if (extra_cnt & EXTRA_ROUNDING)
1158                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1159 #endif
1160         free(REQ_EXTRA(file, extra_cnt));
1161 }
1162
1163 static struct file_struct *send_file_name(int f, struct file_list *flist,
1164                                           char *fname, STRUCT_STAT *stp,
1165                                           int flags, int filter_flags)
1166 {
1167         struct file_struct *file;
1168 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1169         statx sx;
1170 #endif
1171
1172         file = make_file(fname, flist, stp, flags, filter_flags);
1173         if (!file)
1174                 return NULL;
1175
1176         if (chmod_modes && !S_ISLNK(file->mode))
1177                 file->mode = tweak_mode(file->mode, chmod_modes);
1178
1179 #ifdef SUPPORT_ACLS
1180         if (preserve_acls && !S_ISLNK(file->mode) && f >= 0) {
1181                 sx.st.st_mode = file->mode;
1182                 sx.acc_acl = sx.def_acl = NULL;
1183                 if (get_acl(fname, &sx) < 0)
1184                         return NULL;
1185         }
1186 #endif
1187 #ifdef SUPPORT_XATTRS
1188         if (preserve_xattrs && f >= 0) {
1189                 sx.xattr = NULL;
1190                 if (get_xattr(fname, &sx) < 0)
1191                         return NULL;
1192         }
1193 #endif
1194
1195         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1196
1197         flist_expand(flist);
1198         flist->files[flist->count++] = file;
1199         if (f >= 0) {
1200                 send_file_entry(f, file, flist->count - 1);
1201 #ifdef SUPPORT_ACLS
1202                 if (preserve_acls && !S_ISLNK(file->mode)) {
1203                         send_acl(&sx, f);
1204                         free_acl(&sx);
1205                 }
1206 #endif
1207 #ifdef SUPPORT_XATTRS
1208                 if (preserve_xattrs) {
1209                         F_XATTR(file) = send_xattr(&sx, f);
1210                         free_xattr(&sx);
1211                 }
1212 #endif
1213         }
1214         return file;
1215 }
1216
1217 static void send_if_directory(int f, struct file_list *flist,
1218                               struct file_struct *file,
1219                               char *fbuf, unsigned int ol,
1220                               int flags)
1221 {
1222         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1223
1224         if (S_ISDIR(file->mode)
1225             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1226                 void *save_filters;
1227                 unsigned int len = strlen(fbuf);
1228                 if (len > 1 && fbuf[len-1] == '/')
1229                         fbuf[--len] = '\0';
1230                 if (len >= MAXPATHLEN - 1) {
1231                         io_error |= IOERR_GENERAL;
1232                         rprintf(FERROR, "skipping long-named directory: %s\n",
1233                                 full_fname(fbuf));
1234                         return;
1235                 }
1236                 save_filters = push_local_filters(fbuf, len);
1237                 send_directory(f, flist, -1, fbuf, len, flags);
1238                 pop_local_filters(save_filters);
1239                 fbuf[ol] = '\0';
1240                 if (is_dot_dir)
1241                         fbuf[ol-1] = '.';
1242         }
1243 }
1244
1245 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1246 {
1247         return f_name_cmp(*file1, *file2);
1248 }
1249
1250 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1251  * sort them by name, and link them into the tree, setting the appropriate
1252  * parent/child/sibling pointers. */
1253 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1254 {
1255         int i;
1256         int32 *dp = NULL;
1257         int32 *parent_dp = parent_ndx < 0 ? NULL
1258                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1259
1260         qsort(dir_flist->files + start, end - start + 1,
1261               sizeof dir_flist->files[0], (int (*)())file_compare);
1262
1263         for (i = start; i <= end; i++) {
1264                 struct file_struct *file = dir_flist->files[i];
1265                 if (!(file->flags & FLAG_XFER_DIR)
1266                  || file->flags & FLAG_MOUNT_DIR)
1267                         continue;
1268                 if (dp)
1269                         DIR_NEXT_SIBLING(dp) = i;
1270                 else if (parent_dp)
1271                         DIR_FIRST_CHILD(parent_dp) = i;
1272                 else
1273                         send_dir_ndx = i;
1274                 dp = F_DIRNODE_P(file);
1275                 DIR_PARENT(dp) = parent_ndx;
1276                 DIR_FIRST_CHILD(dp) = -1;
1277         }
1278         if (dp)
1279                 DIR_NEXT_SIBLING(dp) = -1;
1280 }
1281
1282 /* This function is normally called by the sender, but the receiving side also
1283  * calls it from get_dirlist() with f set to -1 so that we just construct the
1284  * file list in memory without sending it over the wire.  Also, get_dirlist()
1285  * might call this with f set to -2, which also indicates that local filter
1286  * rules should be ignored. */
1287 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1288                            char *fbuf, int len, int flags)
1289 {
1290         struct dirent *di;
1291         unsigned remainder;
1292         char *p;
1293         DIR *d;
1294         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1295         int start = divert_dirs ? dir_flist->count : flist->count;
1296         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1297
1298         assert(flist != NULL);
1299
1300         if (!(d = opendir(fbuf))) {
1301                 io_error |= IOERR_GENERAL;
1302                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1303                 return;
1304         }
1305
1306         p = fbuf + len;
1307         if (len != 1 || *fbuf != '/')
1308                 *p++ = '/';
1309         *p = '\0';
1310         remainder = MAXPATHLEN - (p - fbuf);
1311
1312         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1313                 char *dname = d_name(di);
1314                 if (dname[0] == '.' && (dname[1] == '\0'
1315                     || (dname[1] == '.' && dname[2] == '\0')))
1316                         continue;
1317                 if (strlcpy(p, dname, remainder) >= remainder) {
1318                         io_error |= IOERR_GENERAL;
1319                         rprintf(FINFO,
1320                                 "cannot send long-named file %s\n",
1321                                 full_fname(fbuf));
1322                         continue;
1323                 }
1324
1325                 send_file_name(f, flist, fbuf, NULL, flags, filter_flags);
1326         }
1327
1328         fbuf[len] = '\0';
1329
1330         if (errno) {
1331                 io_error |= IOERR_GENERAL;
1332                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1333         }
1334
1335         closedir(d);
1336
1337         if (f < 0)
1338                 return;
1339
1340         if (divert_dirs)
1341                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1342         else if (recurse) {
1343                 int i, end = flist->count - 1;
1344                 /* send_if_directory() bumps flist->count, so use "end". */
1345                 for (i = start; i <= end; i++)
1346                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1347         }
1348 }
1349
1350 void send_extra_file_list(int f, int at_least)
1351 {
1352         char fbuf[MAXPATHLEN];
1353         struct file_list *flist;
1354         int64 start_write;
1355         int future_cnt, save_io_error = io_error;
1356
1357         if (flist_eof)
1358                 return;
1359
1360         /* Keep sending data until we have the requested number of
1361          * files in the upcoming file-lists. */
1362         if (cur_flist->next) {
1363                 flist = first_flist->prev; /* the newest flist */
1364                 future_cnt = flist->count
1365                            + flist->ndx_start - cur_flist->next->ndx_start;
1366         } else
1367                 future_cnt = 0;
1368         while (future_cnt < at_least) {
1369                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1370                 int32 *dp;
1371                 int dlen;
1372
1373                 f_name(file, fbuf);
1374                 dlen = strlen(fbuf);
1375
1376                 if (F_ROOTDIR(file) != flist_dir) {
1377                         if (!push_flist_dir(F_ROOTDIR(file), -1))
1378                                 exit_cleanup(RERR_FILESELECT);
1379                 }
1380
1381                 flist = flist_new(0, "send_extra_file_list");
1382                 start_write = stats.total_written;
1383
1384                 write_ndx(f, NDX_FLIST_OFFSET - send_dir_ndx);
1385                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1386                 send_directory(f, flist, send_dir_ndx, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1387                 write_byte(f, 0);
1388
1389                 clean_flist(flist, 0, 0);
1390                 file_total += flist->count;
1391                 future_cnt += flist->count;
1392                 stats.flist_size += stats.total_written - start_write;
1393                 stats.num_files += flist->count;
1394                 if (verbose > 3)
1395                         output_flist(flist);
1396
1397                 dp = F_DIRNODE_P(file);
1398                 if (DIR_FIRST_CHILD(dp) >= 0) {
1399                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1400                         send_dir_depth++;
1401                 } else {
1402                         while (DIR_NEXT_SIBLING(dp) < 0) {
1403                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1404                                         write_ndx(f, NDX_FLIST_EOF);
1405                                         flist_eof = 1;
1406                                         change_local_filter_dir(NULL, 0, 0);
1407                                         goto finish;
1408                                 }
1409                                 send_dir_depth--;
1410                                 file = dir_flist->files[send_dir_ndx];
1411                                 dp = F_DIRNODE_P(file);
1412                         }
1413                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1414                 }
1415         }
1416
1417   finish:
1418         if (io_error != save_io_error && !ignore_errors)
1419                 send_msg_int(MSG_IO_ERROR, io_error);
1420 }
1421
1422 struct file_list *send_file_list(int f, int argc, char *argv[])
1423 {
1424         int len;
1425         STRUCT_STAT st;
1426         char *p, *dir;
1427         char lastpath[MAXPATHLEN] = "";
1428         struct file_list *flist;
1429         struct timeval start_tv, end_tv;
1430         int64 start_write;
1431         int use_ff_fd = 0;
1432         int flags, disable_buffering;
1433
1434         rprintf(FLOG, "building file list\n");
1435         if (show_filelist_p())
1436                 start_filelist_progress("building file list");
1437         else if (inc_recurse && verbose && !am_server)
1438                 rprintf(FCLIENT, "sending incremental file list\n");
1439
1440         start_write = stats.total_written;
1441         gettimeofday(&start_tv, NULL);
1442
1443 #ifdef SUPPORT_HARD_LINKS
1444         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1445                 init_hard_links();
1446 #endif
1447
1448         flist = cur_flist = flist_new(0, "send_file_list");
1449         if (inc_recurse) {
1450                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1451                 flags = FLAG_DIVERT_DIRS;
1452         } else {
1453                 dir_flist = cur_flist;
1454                 flags = 0;
1455         }
1456
1457         disable_buffering = io_start_buffering_out(f);
1458         if (filesfrom_fd >= 0) {
1459                 if (argv[0] && !push_dir(argv[0], 0)) {
1460                         rsyserr(FERROR, errno, "push_dir %s failed in %s",
1461                                 full_fname(argv[0]), curr_dir);
1462                         exit_cleanup(RERR_FILESELECT);
1463                 }
1464                 use_ff_fd = 1;
1465         }
1466
1467         while (1) {
1468                 char fbuf[MAXPATHLEN];
1469                 char *fn;
1470                 int is_dot_dir;
1471
1472                 if (use_ff_fd) {
1473                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1474                                 break;
1475                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1476                 } else {
1477                         if (argc-- == 0)
1478                                 break;
1479                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1480                         if (sanitize_paths)
1481                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1482                 }
1483
1484                 len = strlen(fbuf);
1485                 if (relative_paths) {
1486                         /* We clean up fbuf below. */
1487                         is_dot_dir = 0;
1488                 } else if (!len || fbuf[len - 1] == '/') {
1489                         if (len == 2 && fbuf[0] == '.') {
1490                                 /* Turn "./" into just "." rather than "./." */
1491                                 fbuf[1] = '\0';
1492                         } else {
1493                                 if (len + 1 >= MAXPATHLEN)
1494                                         overflow_exit("send_file_list");
1495                                 fbuf[len++] = '.';
1496                                 fbuf[len] = '\0';
1497                         }
1498                         is_dot_dir = 1;
1499                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1500                     && (len == 2 || fbuf[len-3] == '/')) {
1501                         if (len + 2 >= MAXPATHLEN)
1502                                 overflow_exit("send_file_list");
1503                         fbuf[len++] = '/';
1504                         fbuf[len++] = '.';
1505                         fbuf[len] = '\0';
1506                         is_dot_dir = 1;
1507                 } else {
1508                         is_dot_dir = fbuf[len-1] == '.'
1509                                    && (len == 1 || fbuf[len-2] == '/');
1510                 }
1511
1512                 dir = NULL;
1513
1514                 if (!relative_paths) {
1515                         p = strrchr(fbuf, '/');
1516                         if (p) {
1517                                 *p = '\0';
1518                                 if (p == fbuf)
1519                                         dir = "/";
1520                                 else
1521                                         dir = fbuf;
1522                                 len -= p - fbuf + 1;
1523                                 fn = p + 1;
1524                         } else
1525                                 fn = fbuf;
1526                 } else {
1527                         if ((p = strstr(fbuf, "/./")) != NULL) {
1528                                 *p = '\0';
1529                                 if (p == fbuf)
1530                                         dir = "/";
1531                                 else
1532                                         dir = fbuf;
1533                                 len -= p - fbuf + 3;
1534                                 fn = p + 3;
1535                         } else
1536                                 fn = fbuf;
1537                         /* Get rid of trailing "/" and "/.". */
1538                         while (len) {
1539                                 if (fn[len - 1] == '/') {
1540                                         is_dot_dir = 1;
1541                                         if (!--len && !dir) {
1542                                                 len++;
1543                                                 break;
1544                                         }
1545                                 }
1546                                 else if (len >= 2 && fn[len - 1] == '.'
1547                                                   && fn[len - 2] == '/') {
1548                                         is_dot_dir = 1;
1549                                         if (!(len -= 2) && !dir) {
1550                                                 len++;
1551                                                 break;
1552                                         }
1553                                 } else
1554                                         break;
1555                         }
1556                         if (len == 1 && fn[0] == '/')
1557                                 fn[len++] = '.';
1558                         fn[len] = '\0';
1559                         /* Reject a ".." dir in the active part of the path. */
1560                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1561                                 if ((p[2] == '/' || p[2] == '\0')
1562                                  && (p == fn || p[-1] == '/')) {
1563                                         rprintf(FERROR,
1564                                             "found \"..\" dir in relative path: %s\n",
1565                                             fbuf);
1566                                         exit_cleanup(RERR_SYNTAX);
1567                                 }
1568                         }
1569                 }
1570
1571                 if (!*fn) {
1572                         len = 1;
1573                         fn = ".";
1574                 }
1575
1576                 if (dir && *dir) {
1577                         static const char *lastdir;
1578                         static int lastdir_len = -1;
1579                         int len = strlen(dir);
1580
1581                         if (len != lastdir_len || memcmp(lastdir, dir, len) != 0) {
1582                                 if (!push_flist_dir(strdup(dir), len))
1583                                         goto push_error;
1584                                 lastdir = flist_dir;
1585                                 lastdir_len = flist_dir_len;
1586                         } else if (!push_flist_dir(lastdir, lastdir_len)) {
1587                           push_error:
1588                                 io_error |= IOERR_GENERAL;
1589                                 rsyserr(FERROR, errno, "push_dir %s failed in %s",
1590                                         full_fname(dir), curr_dir);
1591                                 continue;
1592                         }
1593                 }
1594
1595                 if (fn != fbuf)
1596                         memmove(fbuf, fn, len + 1);
1597
1598                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1599                         io_error |= IOERR_GENERAL;
1600                         rsyserr(FERROR, errno, "link_stat %s failed",
1601                                 full_fname(fbuf));
1602                         continue;
1603                 }
1604
1605                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1606                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1607                         continue;
1608                 }
1609
1610                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1611                         /* Send the implied directories at the start of the
1612                          * source spec, so we get their permissions right. */
1613                         char *lp = lastpath, *slash = fbuf;
1614                         *p = '\0';
1615                         /* Skip any initial directories in our path that we
1616                          * have in common with lastpath. */
1617                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1618                                 if (*fn == '/')
1619                                         slash = fn;
1620                         }
1621                         *p = '/';
1622                         if (fn != p || (*lp && *lp != '/')) {
1623                                 int save_copy_links = copy_links;
1624                                 int save_xfer_dirs = xfer_dirs;
1625                                 int dir_flags = inc_recurse ? FLAG_DIVERT_DIRS : 0;
1626                                 copy_links |= copy_unsafe_links;
1627                                 xfer_dirs = 1;
1628                                 while ((slash = strchr(slash+1, '/')) != 0) {
1629                                         *slash = '\0';
1630                                         send_file_name(f, flist, fbuf, NULL,
1631                                                        dir_flags, ALL_FILTERS);
1632                                         *slash = '/';
1633                                 }
1634                                 copy_links = save_copy_links;
1635                                 xfer_dirs = save_xfer_dirs;
1636                                 *p = '\0';
1637                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1638                                 *p = '/';
1639                         }
1640                 }
1641
1642                 if (one_file_system)
1643                         filesystem_dev = st.st_dev;
1644
1645                 if (recurse || (xfer_dirs && is_dot_dir)) {
1646                         struct file_struct *file;
1647                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR
1648                                       | (is_dot_dir ? 0 : flags)
1649                                       | (inc_recurse ? FLAG_DIVERT_DIRS : 0);
1650                         file = send_file_name(f, flist, fbuf, &st,
1651                                               top_flags, ALL_FILTERS);
1652                         if (file && !inc_recurse)
1653                                 send_if_directory(f, flist, file, fbuf, len, flags);
1654                 } else
1655                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1656         }
1657
1658         gettimeofday(&end_tv, NULL);
1659         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1660                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1661         if (stats.flist_buildtime == 0)
1662                 stats.flist_buildtime = 1;
1663         start_tv = end_tv;
1664
1665         write_byte(f, 0); /* Indicate end of file list */
1666
1667 #ifdef SUPPORT_HARD_LINKS
1668         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1669                 idev_destroy();
1670 #endif
1671
1672         if (show_filelist_p())
1673                 finish_filelist_progress(flist);
1674
1675         gettimeofday(&end_tv, NULL);
1676         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1677                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1678
1679         /* Sort the list without removing any duplicates in non-incremental
1680          * mode.  This allows the receiving side to ask for whatever name it
1681          * kept.  For incremental mode, the sender also removes duplicates
1682          * in this initial file-list so that it avoids re-sending duplicated
1683          * directories. */
1684         clean_flist(flist, 0, inc_recurse);
1685         file_total += flist->count;
1686
1687         if (!numeric_ids && !inc_recurse)
1688                 send_uid_list(f);
1689
1690         /* send the io_error flag */
1691         if (protocol_version < 30)
1692                 write_int(f, ignore_errors ? 0 : io_error);
1693         else if (io_error && !ignore_errors)
1694                 send_msg_int(MSG_IO_ERROR, io_error);
1695
1696         if (disable_buffering)
1697                 io_end_buffering_out();
1698
1699         stats.flist_size = stats.total_written - start_write;
1700         stats.num_files = flist->count;
1701
1702         if (verbose > 3)
1703                 output_flist(flist);
1704
1705         if (verbose > 2)
1706                 rprintf(FINFO, "send_file_list done\n");
1707
1708         if (inc_recurse) {
1709                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1710                 if (send_dir_ndx < 0) {
1711                         write_ndx(f, NDX_FLIST_EOF);
1712                         flist_eof = 1;
1713                 }
1714                 else if (file_total == 1) {
1715                         /* If we're creating incremental file-lists and there
1716                          * was just 1 item in the first file-list, send 1 more
1717                          * file-list to check if this is a 1-file xfer. */
1718                         send_extra_file_list(f, 1);
1719                 }
1720         }
1721
1722         return flist;
1723 }
1724
1725 struct file_list *recv_file_list(int f)
1726 {
1727         struct file_list *flist;
1728         int dstart, flags;
1729         int64 start_read;
1730
1731         if (!first_flist)
1732                 rprintf(FLOG, "receiving file list\n");
1733         if (show_filelist_p())
1734                 start_filelist_progress("receiving file list");
1735         else if (inc_recurse && verbose && !am_server && !first_flist)
1736                 rprintf(FCLIENT, "receiving incremental file list\n");
1737
1738         start_read = stats.total_read;
1739
1740         flist = flist_new(0, "recv_file_list");
1741
1742 #ifdef SUPPORT_HARD_LINKS
1743         if (preserve_hard_links && protocol_version < 30)
1744                 init_hard_links();
1745 #endif
1746
1747         if (inc_recurse) {
1748                 if (flist->ndx_start == 0)
1749                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1750                 dstart = dir_flist->count;
1751         } else {
1752                 dir_flist = flist;
1753                 dstart = 0;
1754         }
1755
1756         while ((flags = read_byte(f)) != 0) {
1757                 struct file_struct *file;
1758
1759                 flist_expand(flist);
1760
1761                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1762                         flags |= read_byte(f) << 8;
1763                 file = recv_file_entry(flist, flags, f);
1764
1765                 if (inc_recurse && S_ISDIR(file->mode)) {
1766                         flist_expand(dir_flist);
1767                         dir_flist->files[dir_flist->count++] = file;
1768                 }
1769
1770                 flist->files[flist->count++] = file;
1771
1772                 maybe_emit_filelist_progress(flist->count);
1773
1774                 if (verbose > 2) {
1775                         rprintf(FINFO, "recv_file_name(%s)\n",
1776                                 f_name(file, NULL));
1777                 }
1778         }
1779         file_total += flist->count;
1780
1781         if (verbose > 2)
1782                 rprintf(FINFO, "received %d names\n", flist->count);
1783
1784         if (show_filelist_p())
1785                 finish_filelist_progress(flist);
1786
1787         clean_flist(flist, relative_paths, 1);
1788
1789         if (inc_recurse) {
1790                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1791                       sizeof dir_flist->files[0], (int (*)())file_compare);
1792         } else if (f >= 0)
1793                 recv_uid_list(f, flist);
1794
1795         if (protocol_version < 30) {
1796                 /* Recv the io_error flag */
1797                 if (ignore_errors)
1798                         read_int(f);
1799                 else
1800                         io_error |= read_int(f);
1801         }
1802
1803         if (verbose > 3)
1804                 output_flist(flist);
1805
1806         if (list_only) {
1807                 int i;
1808                 for (i = 0; i < flist->count; i++)
1809                         list_file_entry(flist->files[i]);
1810         }
1811
1812         if (verbose > 2)
1813                 rprintf(FINFO, "recv_file_list done\n");
1814
1815         stats.flist_size += stats.total_read - start_read;
1816         stats.num_files += flist->count;
1817
1818         return flist;
1819 }
1820
1821 /* This is only used once by the receiver if the very first file-list
1822  * has exactly one item in it. */
1823 void recv_additional_file_list(int f)
1824 {
1825         struct file_list *flist;
1826         int ndx = read_ndx(f);
1827         if (ndx == NDX_FLIST_EOF) {
1828                 flist_eof = 1;
1829                 change_local_filter_dir(NULL, 0, 0);
1830         } else {
1831                 ndx = NDX_FLIST_OFFSET - ndx;
1832                 if (ndx < 0 || ndx >= dir_flist->count) {
1833                         ndx = NDX_FLIST_OFFSET - ndx;
1834                         rprintf(FERROR,
1835                                 "Invalid dir index: %d (%d - %d)\n",
1836                                 ndx, NDX_FLIST_OFFSET,
1837                                 NDX_FLIST_OFFSET - dir_flist->count);
1838                         exit_cleanup(RERR_PROTOCOL);
1839                 }
1840                 flist = recv_file_list(f);
1841                 flist->parent_ndx = ndx;
1842         }
1843 }
1844
1845 /* Search for an identically-named item in the file list.  Note that the
1846  * items must agree in their directory-ness, or no match is returned. */
1847 int flist_find(struct file_list *flist, struct file_struct *f)
1848 {
1849         int low = flist->low, high = flist->high;
1850         int diff, mid, mid_up;
1851
1852         while (low <= high) {
1853                 mid = (low + high) / 2;
1854                 if (F_IS_ACTIVE(flist->files[mid]))
1855                         mid_up = mid;
1856                 else {
1857                         /* Scan for the next non-empty entry using the cached
1858                          * distance values.  If the value isn't fully up-to-
1859                          * date, update it. */
1860                         mid_up = mid + F_DEPTH(flist->files[mid]);
1861                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1862                                 do {
1863                                     mid_up += F_DEPTH(flist->files[mid_up]);
1864                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1865                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1866                         }
1867                         if (mid_up > high) {
1868                                 /* If there's nothing left above us, set high to
1869                                  * a non-empty entry below us and continue. */
1870                                 high = mid - (int)flist->files[mid]->len32;
1871                                 if (!F_IS_ACTIVE(flist->files[high])) {
1872                                         do {
1873                                             high -= (int)flist->files[high]->len32;
1874                                         } while (!F_IS_ACTIVE(flist->files[high]));
1875                                         flist->files[mid]->len32 = mid - high;
1876                                 }
1877                                 continue;
1878                         }
1879                 }
1880                 diff = f_name_cmp(flist->files[mid_up], f);
1881                 if (diff == 0) {
1882                         if (protocol_version < 29
1883                             && S_ISDIR(flist->files[mid_up]->mode)
1884                             != S_ISDIR(f->mode))
1885                                 return -1;
1886                         return mid_up;
1887                 }
1888                 if (diff < 0)
1889                         low = mid_up + 1;
1890                 else
1891                         high = mid - 1;
1892         }
1893         return -1;
1894 }
1895
1896 /*
1897  * Free up any resources a file_struct has allocated
1898  * and clear the file.
1899  */
1900 void clear_file(struct file_struct *file)
1901 {
1902         /* The +1 zeros out the first char of the basename. */
1903         memset(file, 0, FILE_STRUCT_LEN + 1);
1904         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1905          * entry.  Likewise for len32 in the opposite direction.  We assume
1906          * that we're alone for now since flist_find() will adjust the counts
1907          * it runs into that aren't up-to-date. */
1908         file->len32 = F_DEPTH(file) = 1;
1909 }
1910
1911 /* Allocate a new file list. */
1912 struct file_list *flist_new(int flags, char *msg)
1913 {
1914         struct file_list *flist;
1915
1916         flist = new(struct file_list);
1917         if (!flist)
1918                 out_of_memory(msg);
1919
1920         memset(flist, 0, sizeof flist[0]);
1921
1922         if (!(flags & FLIST_TEMP)) {
1923                 if (first_flist) {
1924                         flist->ndx_start = first_flist->prev->ndx_start
1925                                          + first_flist->prev->count;
1926                 }
1927                 /* This is a doubly linked list with prev looping back to
1928                  * the end of the list, but the last next pointer is NULL. */
1929                 if (!first_flist)
1930                         first_flist = cur_flist = flist->prev = flist;
1931                 else {
1932                         flist->prev = first_flist->prev;
1933                         flist->prev->next = first_flist->prev = flist;
1934                 }
1935                 flist_cnt++;
1936         }
1937
1938         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1939                 out_of_memory(msg);
1940
1941         return flist;
1942 }
1943
1944 /* Free up all elements in a flist. */
1945 void flist_free(struct file_list *flist)
1946 {
1947         if (!flist->prev)
1948                 ; /* Was FLIST_TEMP dir-list. */
1949         else if (flist == flist->prev) {
1950                 first_flist = cur_flist = NULL;
1951                 file_total = 0;
1952                 flist_cnt = 0;
1953         } else {
1954                 if (flist == cur_flist)
1955                         cur_flist = flist->next;
1956                 if (flist == first_flist)
1957                         first_flist = first_flist->next;
1958                 else {
1959                         flist->prev->next = flist->next;
1960                         if (!flist->next)
1961                                 flist->next = first_flist;
1962                 }
1963                 flist->next->prev = flist->prev;
1964                 file_total -= flist->count;
1965                 flist_cnt--;
1966         }
1967
1968         pool_destroy(flist->file_pool);
1969         free(flist->files);
1970         free(flist);
1971 }
1972
1973 /*
1974  * This routine ensures we don't have any duplicate names in our file list.
1975  * duplicate names can cause corruption because of the pipelining
1976  */
1977 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1978 {
1979         char fbuf[MAXPATHLEN];
1980         int i, prev_i = 0;
1981
1982         if (!flist)
1983                 return;
1984         if (flist->count == 0) {
1985                 flist->high = -1;
1986                 return;
1987         }
1988
1989         qsort(flist->files, flist->count,
1990             sizeof flist->files[0], (int (*)())file_compare);
1991
1992         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1993                 if (F_IS_ACTIVE(flist->files[i])) {
1994                         prev_i = i;
1995                         break;
1996                 }
1997         }
1998         flist->low = prev_i;
1999         while (++i < flist->count) {
2000                 int j;
2001                 struct file_struct *file = flist->files[i];
2002
2003                 if (!F_IS_ACTIVE(file))
2004                         continue;
2005                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
2006                         j = prev_i;
2007                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2008                         int save_mode = file->mode;
2009                         /* Make sure that this directory doesn't duplicate a
2010                          * non-directory earlier in the list. */
2011                         flist->high = prev_i;
2012                         file->mode = S_IFREG;
2013                         j = flist_find(flist, file);
2014                         file->mode = save_mode;
2015                 } else
2016                         j = -1;
2017                 if (j >= 0) {
2018                         struct file_struct *fp = flist->files[j];
2019                         int keep, drop;
2020                         /* If one is a dir and the other is not, we want to
2021                          * keep the dir because it might have contents in the
2022                          * list. */
2023                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
2024                                 if (S_ISDIR(file->mode))
2025                                         keep = i, drop = j;
2026                                 else
2027                                         keep = j, drop = i;
2028                         } else if (protocol_version < 27)
2029                                 keep = j, drop = i;
2030                         else
2031                                 keep = i, drop = j;
2032                         if (verbose > 1 && !am_server) {
2033                                 rprintf(FINFO,
2034                                         "removing duplicate name %s from file list (%d)\n",
2035                                         f_name(file, fbuf), drop);
2036                         }
2037                         /* Make sure we don't lose track of a user-specified
2038                          * top directory. */
2039                         flist->files[keep]->flags |= flist->files[drop]->flags
2040                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
2041
2042                         clear_file(flist->files[drop]);
2043
2044                         if (keep == i) {
2045                                 if (flist->low == drop) {
2046                                         for (j = drop + 1;
2047                                              j < i && !F_IS_ACTIVE(flist->files[j]);
2048                                              j++) {}
2049                                         flist->low = j;
2050                                 }
2051                                 prev_i = i;
2052                         }
2053                 } else
2054                         prev_i = i;
2055         }
2056         flist->high = no_dups ? prev_i : flist->count - 1;
2057
2058         if (strip_root) {
2059                 /* We need to strip off the leading slashes for relative
2060                  * paths, but this must be done _after_ the sorting phase. */
2061                 for (i = flist->low; i <= flist->high; i++) {
2062                         struct file_struct *file = flist->files[i];
2063
2064                         if (!file->dirname)
2065                                 continue;
2066                         while (*file->dirname == '/')
2067                                 file->dirname++;
2068                         if (!*file->dirname)
2069                                 file->dirname = NULL;
2070                 }
2071         }
2072
2073         if (prune_empty_dirs && no_dups) {
2074                 int j, prev_depth = 0;
2075
2076                 prev_i = 0; /* It's OK that this isn't really true. */
2077
2078                 for (i = flist->low; i <= flist->high; i++) {
2079                         struct file_struct *fp, *file = flist->files[i];
2080
2081                         /* This temporarily abuses the F_DEPTH() value for a
2082                          * directory that is in a chain that might get pruned.
2083                          * We restore the old value if it gets a reprieve. */
2084                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2085                                 /* Dump empty dirs when coming back down. */
2086                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2087                                         fp = flist->files[prev_i];
2088                                         if (F_DEPTH(fp) >= 0)
2089                                                 break;
2090                                         prev_i = -F_DEPTH(fp)-1;
2091                                         clear_file(fp);
2092                                 }
2093                                 prev_depth = F_DEPTH(file);
2094                                 if (is_excluded(f_name(file, fbuf), 1,
2095                                                        ALL_FILTERS)) {
2096                                         /* Keep dirs through this dir. */
2097                                         for (j = prev_depth-1; ; j--) {
2098                                                 fp = flist->files[prev_i];
2099                                                 if (F_DEPTH(fp) >= 0)
2100                                                         break;
2101                                                 prev_i = -F_DEPTH(fp)-1;
2102                                                 F_DEPTH(fp) = j;
2103                                         }
2104                                 } else
2105                                         F_DEPTH(file) = -prev_i-1;
2106                                 prev_i = i;
2107                         } else {
2108                                 /* Keep dirs through this non-dir. */
2109                                 for (j = prev_depth; ; j--) {
2110                                         fp = flist->files[prev_i];
2111                                         if (F_DEPTH(fp) >= 0)
2112                                                 break;
2113                                         prev_i = -F_DEPTH(fp)-1;
2114                                         F_DEPTH(fp) = j;
2115                                 }
2116                         }
2117                 }
2118                 /* Dump all remaining empty dirs. */
2119                 while (1) {
2120                         struct file_struct *fp = flist->files[prev_i];
2121                         if (F_DEPTH(fp) >= 0)
2122                                 break;
2123                         prev_i = -F_DEPTH(fp)-1;
2124                         clear_file(fp);
2125                 }
2126
2127                 for (i = flist->low; i <= flist->high; i++) {
2128                         if (F_IS_ACTIVE(flist->files[i]))
2129                                 break;
2130                 }
2131                 flist->low = i;
2132                 for (i = flist->high; i >= flist->low; i--) {
2133                         if (F_IS_ACTIVE(flist->files[i]))
2134                                 break;
2135                 }
2136                 flist->high = i;
2137         }
2138 }
2139
2140 static void output_flist(struct file_list *flist)
2141 {
2142         char uidbuf[16], gidbuf[16], depthbuf[16];
2143         struct file_struct *file;
2144         const char *root, *dir, *slash, *name, *trail;
2145         const char *who = who_am_i();
2146         int i;
2147
2148         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2149                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2150         for (i = 0; i < flist->count; i++) {
2151                 file = flist->files[i];
2152                 if ((am_root || am_sender) && preserve_uid) {
2153                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2154                                  (long)F_UID(file));
2155                 } else
2156                         *uidbuf = '\0';
2157                 if (preserve_gid && F_GID(file) != GID_NONE) {
2158                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2159                                  (long)F_GID(file));
2160                 } else
2161                         *gidbuf = '\0';
2162                 if (!am_sender)
2163                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2164                 if (F_IS_ACTIVE(file)) {
2165                         root = am_sender ? NS(F_ROOTDIR(file)) : depthbuf;
2166                         if ((dir = file->dirname) == NULL)
2167                                 dir = slash = "";
2168                         else
2169                                 slash = "/";
2170                         name = file->basename;
2171                         trail = S_ISDIR(file->mode) ? "/" : "";
2172                 } else
2173                         root = dir = slash = name = trail = "";
2174                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2175                         who, i, root, dir, slash, name, trail, (int)file->mode,
2176                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2177         }
2178 }
2179
2180 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2181 enum fnc_type { t_PATH, t_ITEM };
2182
2183 /* Compare the names of two file_struct entities, similar to how strcmp()
2184  * would do if it were operating on the joined strings.
2185  *
2186  * Some differences beginning with protocol_version 29: (1) directory names
2187  * are compared with an assumed trailing slash so that they compare in a
2188  * way that would cause them to sort immediately prior to any content they
2189  * may have; (2) a directory of any name compares after a non-directory of
2190  * any name at the same depth; (3) a directory with name "." compares prior
2191  * to anything else.  These changes mean that a directory and a non-dir
2192  * with the same name will not compare as equal (protocol_version >= 29).
2193  *
2194  * The dirname component can be an empty string, but the basename component
2195  * cannot (and never is in the current codebase).  The basename component
2196  * may be NULL (for a removed item), in which case it is considered to be
2197  * after any existing item. */
2198 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2199 {
2200         int dif;
2201         const uchar *c1, *c2;
2202         enum fnc_state state1, state2;
2203         enum fnc_type type1, type2;
2204         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2205
2206         if (!f1 || !F_IS_ACTIVE(f1)) {
2207                 if (!f2 || !F_IS_ACTIVE(f2))
2208                         return 0;
2209                 return -1;
2210         }
2211         if (!f2 || !F_IS_ACTIVE(f2))
2212                 return 1;
2213
2214         c1 = (uchar*)f1->dirname;
2215         c2 = (uchar*)f2->dirname;
2216         if (c1 == c2)
2217                 c1 = c2 = NULL;
2218         if (!c1) {
2219                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2220                 c1 = (const uchar*)f1->basename;
2221                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2222                         type1 = t_ITEM;
2223                         state1 = s_TRAILING;
2224                         c1 = (uchar*)"";
2225                 } else
2226                         state1 = s_BASE;
2227         } else {
2228                 type1 = t_path;
2229                 state1 = s_DIR;
2230         }
2231         if (!c2) {
2232                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2233                 c2 = (const uchar*)f2->basename;
2234                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2235                         type2 = t_ITEM;
2236                         state2 = s_TRAILING;
2237                         c2 = (uchar*)"";
2238                 } else
2239                         state2 = s_BASE;
2240         } else {
2241                 type2 = t_path;
2242                 state2 = s_DIR;
2243         }
2244
2245         if (type1 != type2)
2246                 return type1 == t_PATH ? 1 : -1;
2247
2248         do {
2249                 if (!*c1) {
2250                         switch (state1) {
2251                         case s_DIR:
2252                                 state1 = s_SLASH;
2253                                 c1 = (uchar*)"/";
2254                                 break;
2255                         case s_SLASH:
2256                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2257                                 c1 = (const uchar*)f1->basename;
2258                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2259                                         type1 = t_ITEM;
2260                                         state1 = s_TRAILING;
2261                                         c1 = (uchar*)"";
2262                                 } else
2263                                         state1 = s_BASE;
2264                                 break;
2265                         case s_BASE:
2266                                 state1 = s_TRAILING;
2267                                 if (type1 == t_PATH) {
2268                                         c1 = (uchar*)"/";
2269                                         break;
2270                                 }
2271                                 /* FALL THROUGH */
2272                         case s_TRAILING:
2273                                 type1 = t_ITEM;
2274                                 break;
2275                         }
2276                         if (*c2 && type1 != type2)
2277                                 return type1 == t_PATH ? 1 : -1;
2278                 }
2279                 if (!*c2) {
2280                         switch (state2) {
2281                         case s_DIR:
2282                                 state2 = s_SLASH;
2283                                 c2 = (uchar*)"/";
2284                                 break;
2285                         case s_SLASH:
2286                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2287                                 c2 = (const uchar*)f2->basename;
2288                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2289                                         type2 = t_ITEM;
2290                                         state2 = s_TRAILING;
2291                                         c2 = (uchar*)"";
2292                                 } else
2293                                         state2 = s_BASE;
2294                                 break;
2295                         case s_BASE:
2296                                 state2 = s_TRAILING;
2297                                 if (type2 == t_PATH) {
2298                                         c2 = (uchar*)"/";
2299                                         break;
2300                                 }
2301                                 /* FALL THROUGH */
2302                         case s_TRAILING:
2303                                 if (!*c1)
2304                                         return 0;
2305                                 type2 = t_ITEM;
2306                                 break;
2307                         }
2308                         if (type1 != type2)
2309                                 return type1 == t_PATH ? 1 : -1;
2310                 }
2311         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2312
2313         return dif;
2314 }
2315
2316 char *f_name_buf(void)
2317 {
2318         static char names[5][MAXPATHLEN];
2319         static unsigned int n;
2320
2321         n = (n + 1) % (sizeof names / sizeof names[0]);
2322
2323         return names[n];
2324 }
2325
2326 /* Return a copy of the full filename of a flist entry, using the indicated
2327  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2328  * done because we checked the size when creating the file_struct entry.
2329  */
2330 char *f_name(struct file_struct *f, char *fbuf)
2331 {
2332         if (!f || !F_IS_ACTIVE(f))
2333                 return NULL;
2334
2335         if (!fbuf)
2336                 fbuf = f_name_buf();
2337
2338         if (f->dirname) {
2339                 int len = strlen(f->dirname);
2340                 memcpy(fbuf, f->dirname, len);
2341                 fbuf[len] = '/';
2342                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2343         } else
2344                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2345
2346         return fbuf;
2347 }
2348
2349 /* Do a non-recursive scan of the named directory, possibly ignoring all
2350  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2351  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2352  * buffer (the functions we call will append names onto the end, but the old
2353  * dir value will be restored on exit). */
2354 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2355 {
2356         struct file_list *dirlist;
2357         char dirbuf[MAXPATHLEN];
2358         int save_recurse = recurse;
2359         int save_xfer_dirs = xfer_dirs;
2360
2361         if (dlen < 0) {
2362                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2363                 if (dlen >= MAXPATHLEN)
2364                         return NULL;
2365                 dirname = dirbuf;
2366         }
2367
2368         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2369
2370         recurse = 0;
2371         xfer_dirs = 1;
2372         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2373         xfer_dirs = save_xfer_dirs;
2374         recurse = save_recurse;
2375         if (do_progress)
2376                 flist_count_offset += dirlist->count;
2377
2378         clean_flist(dirlist, 0, 0);
2379
2380         if (verbose > 3)
2381                 output_flist(dirlist);
2382
2383         return dirlist;
2384 }