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_varint30(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_varint30(f, first_hlink_ndx);
 481                 goto the_end;
 482         }
 483
 484         write_varlong30(f, F_LENGTH(file), 3);
 485         if (!(flags & XMIT_SAME_TIME)) {
 486                 if (protocol_version >= 30)
 487                         write_varlong(f, modtime, 4);
 488                 else
 489                         write_int(f, modtime);
 490         }
 491         if (!(flags & XMIT_SAME_MODE))
 492                 write_int(f, to_wire_mode(mode));
 493         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 494                 if (protocol_version < 30)
 495                         write_int(f, uid);
 496                 else {
 497                         write_varint(f, uid);
 498                         if (flags & XMIT_USER_NAME_FOLLOWS) {
 499                                 int len = strlen(user_name);
 500                                 write_byte(f, len);
 501                                 write_buf(f, user_name, len);
 502                         }
 503                 }
 504         }
 505         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 506                 if (protocol_version < 30)
 507                         write_int(f, gid);
 508                 else {
 509                         write_varint(f, gid);
 510                         if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 511                                 int len = strlen(group_name);
 512                                 write_byte(f, len);
 513                                 write_buf(f, group_name, len);
 514                         }
 515                 }
 516         }
 517         if ((preserve_devices && IS_DEVICE(mode))
 518          || (preserve_specials && IS_SPECIAL(mode))) {
 519                 if (protocol_version < 28) {
 520                         if (!(flags & XMIT_SAME_RDEV_pre28))
 521                                 write_int(f, (int)rdev);
 522                 } else {
 523                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 524                                 write_varint30(f, major(rdev));
 525                         if (protocol_version >= 30)
 526                                 write_varint(f, minor(rdev));
 527                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 528                                 write_byte(f, minor(rdev));
 529                         else
 530                                 write_int(f, minor(rdev));
 531                 }
 532         }
 533
 534 #ifdef SUPPORT_LINKS
 535         if (preserve_links && S_ISLNK(mode)) {
 536                 const char *sl = F_SYMLINK(file);
 537                 int len = strlen(sl);
 538                 write_varint30(f, len);
 539                 write_buf(f, sl, len);
 540         }
 541 #endif
 542
 543 #ifdef SUPPORT_HARD_LINKS
 544         if (tmp_dev != 0 && protocol_version < 30) {
 545                 if (protocol_version < 26) {
 546                         /* 32-bit dev_t and ino_t */
 547                         write_int(f, (int32)dev);
 548                         write_int(f, (int32)tmp_ino);
 549                 } else {
 550                         /* 64-bit dev_t and ino_t */
 551                         if (!(flags & XMIT_SAME_DEV_pre30))
 552                                 write_longint(f, dev);
 553                         write_longint(f, tmp_ino);
 554                 }
 555         }
 556 #endif
 557
 558         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 559                 const char *sum;
 560                 if (S_ISREG(mode))
 561                         sum = tmp_sum;
 562                 else {
 563                         /* Prior to 28, we sent a useless set of nulls. */
 564                         sum = empty_sum;
 565                 }
 566                 write_buf(f, sum, checksum_len);
 567         }
 568
 569   the_end:
 570         strlcpy(lastname, fname, MAXPATHLEN);
 571
 572         if (S_ISREG(mode) || S_ISLNK(mode))
 573                 stats.total_size += F_LENGTH(file);
 574 }
 575
 576 static struct file_struct *recv_file_entry(struct file_list *flist,
 577                                            int flags, int f)
 578 {
 579         static time_t modtime;
 580         static mode_t mode;
 581         static int64 dev;
 582         static dev_t rdev;
 583         static uint32 rdev_major;
 584         static uid_t uid;
 585         static gid_t gid;
 586         static char lastname[MAXPATHLEN], *lastdir;
 587         static int lastdir_depth, lastdir_len = -1;
 588         static unsigned int del_hier_name_len = 0;
 589         static int in_del_hier = 0;
 590         char thisname[MAXPATHLEN];
 591         unsigned int l1 = 0, l2 = 0;
 592         int alloc_len, basename_len, linkname_len;
 593         int extra_len = file_extra_cnt * EXTRA_LEN;
 594         int first_hlink_ndx = -1;
 595         OFF_T file_length;
 596         const char *basename;
 597         char *bp;
 598         struct file_struct *file;
 599
 600         if (flags & XMIT_SAME_NAME)
 601                 l1 = read_byte(f);
 602
 603         if (flags & XMIT_LONG_NAME)
 604                 l2 = read_varint30(f);
 605         else
 606                 l2 = read_byte(f);
 607
 608         if (l2 >= MAXPATHLEN - l1) {
 609                 rprintf(FERROR,
 610                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 611                         flags, l1, l2, lastname, who_am_i());
 612                 overflow_exit("recv_file_entry");
 613         }
 614
 615         strlcpy(thisname, lastname, l1 + 1);
 616         read_sbuf(f, &thisname[l1], l2);
 617         thisname[l1 + l2] = 0;
 618
 619         strlcpy(lastname, thisname, MAXPATHLEN);
 620
 621         clean_fname(thisname, 0);
 622
 623         if (sanitize_paths)
 624                 sanitize_path(thisname, thisname, "", 0, NULL);
 625
 626         if ((basename = strrchr(thisname, '/')) != NULL) {
 627                 int len = basename++ - thisname;
 628                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 629                         lastdir = new_array(char, len + 1);
 630                         memcpy(lastdir, thisname, len);
 631                         lastdir[len] = '\0';
 632                         lastdir_len = len;
 633                         lastdir_depth = count_dir_elements(lastdir);
 634                 }
 635         } else
 636                 basename = thisname;
 637         basename_len = strlen(basename) + 1; /* count the '\0' */
 638
 639 #ifdef SUPPORT_HARD_LINKS
 640         if (protocol_version >= 30
 641          && BITS_SETnUNSET(flags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 642                 struct file_struct *first;
 643                 first_hlink_ndx = read_varint30(f);
 644                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->count) {
 645                         rprintf(FERROR,
 646                                 "hard-link reference out of range: %d (%d)\n",
 647                                 first_hlink_ndx, flist->count);
 648                         exit_cleanup(RERR_PROTOCOL);
 649                 }
 650                 first = flist->files[first_hlink_ndx];
 651                 file_length = F_LENGTH(first);
 652                 modtime = first->modtime;
 653                 mode = first->mode;
 654                 if (preserve_uid)
 655                         uid = F_UID(first);
 656                 if (preserve_gid)
 657                         gid = F_GID(first);
 658                 if ((preserve_devices && IS_DEVICE(mode))
 659                  || (preserve_specials && IS_SPECIAL(mode))) {
 660                         uint32 *devp = F_RDEV_P(first);
 661                         rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 662                         extra_len += 2 * EXTRA_LEN;
 663                 }
 664                 if (preserve_links && S_ISLNK(mode))
 665                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 666                 else
 667                         linkname_len = 0;
 668                 goto create_object;
 669         }
 670 #endif
 671
 672         file_length = read_varlong30(f, 3);
 673         if (!(flags & XMIT_SAME_TIME)) {
 674                 if (protocol_version >= 30)
 675                         modtime = (time_t)read_varlong(f, 4);
 676                 else
 677                         modtime = (time_t)read_int(f);
 678         }
 679         if (!(flags & XMIT_SAME_MODE))
 680                 mode = from_wire_mode(read_int(f));
 681
 682         if (chmod_modes && !S_ISLNK(mode))
 683                 mode = tweak_mode(mode, chmod_modes);
 684
 685         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 686                 if (protocol_version < 30)
 687                         uid = (uid_t)read_int(f);
 688                 else {
 689                         uid = (uid_t)read_varint(f);
 690                         if (flags & XMIT_USER_NAME_FOLLOWS)
 691                                 uid = recv_user_name(f, uid);
 692                         else if (inc_recurse && am_root && !numeric_ids)
 693                                 uid = match_uid(uid);
 694                 }
 695         }
 696         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 697                 if (protocol_version < 30)
 698                         gid = (gid_t)read_int(f);
 699                 else {
 700                         gid = (gid_t)read_varint(f);
 701                         if (flags & XMIT_GROUP_NAME_FOLLOWS)
 702                                 gid = recv_group_name(f, gid);
 703                         else if (inc_recurse && (!am_root || !numeric_ids))
 704                                 gid = match_gid(gid);
 705                 }
 706         }
 707
 708         if ((preserve_devices && IS_DEVICE(mode))
 709          || (preserve_specials && IS_SPECIAL(mode))) {
 710                 if (protocol_version < 28) {
 711                         if (!(flags & XMIT_SAME_RDEV_pre28))
 712                                 rdev = (dev_t)read_int(f);
 713                 } else {
 714                         uint32 rdev_minor;
 715                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 716                                 rdev_major = read_varint30(f);
 717                         if (protocol_version >= 30)
 718                                 rdev_minor = read_varint(f);
 719                         else if (flags & XMIT_RDEV_MINOR_8_pre30)
 720                                 rdev_minor = read_byte(f);
 721                         else
 722                                 rdev_minor = read_int(f);
 723                         rdev = MAKEDEV(rdev_major, rdev_minor);
 724                 }
 725                 extra_len += 2 * EXTRA_LEN;
 726                 file_length = 0;
 727         } else if (protocol_version < 28)
 728                 rdev = MAKEDEV(0, 0);
 729
 730 #ifdef SUPPORT_LINKS
 731         if (preserve_links && S_ISLNK(mode)) {
 732                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 733                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 734                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 735                                 linkname_len - 1);
 736                         overflow_exit("recv_file_entry");
 737                 }
 738         }
 739         else
 740 #endif
 741                 linkname_len = 0;
 742
 743 #ifdef SUPPORT_HARD_LINKS
 744   create_object:
 745         if (preserve_hard_links) {
 746                 if (protocol_version < 28 && S_ISREG(mode))
 747                         flags |= XMIT_HLINKED;
 748                 if (flags & XMIT_HLINKED)
 749                         extra_len += EXTRA_LEN;
 750         }
 751 #endif
 752
 753 #ifdef SUPPORT_ACLS
 754         /* We need one or two index int32s when we're preserving ACLs. */
 755         if (preserve_acls)
 756                 extra_len += (S_ISDIR(mode) ? 2 : 1) * EXTRA_LEN;
 757 #endif
 758
 759         if (always_checksum && S_ISREG(mode))
 760                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 761
 762         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 763                 extra_len += EXTRA_LEN;
 764
 765 #if EXTRA_ROUNDING > 0
 766         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 767                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 768 #endif
 769
 770         if (inc_recurse && S_ISDIR(mode)) {
 771                 if (one_file_system) {
 772                         /* Room to save the dir's device for -x */
 773                         extra_len += 2 * EXTRA_LEN;
 774                 }
 775                 flist = dir_flist;
 776         }
 777
 778         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 779                   + linkname_len;
 780         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
 781
 782         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 783         bp += extra_len;
 784         file = (struct file_struct *)bp;
 785         bp += FILE_STRUCT_LEN;
 786
 787         memcpy(bp, basename, basename_len);
 788         bp += basename_len + linkname_len; /* skip space for symlink too */
 789
 790 #ifdef SUPPORT_HARD_LINKS
 791         if (flags & XMIT_HLINKED)
 792                 file->flags |= FLAG_HLINKED;
 793 #endif
 794         file->modtime = modtime;
 795         file->len32 = (uint32)file_length;
 796         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 797                 file->flags |= FLAG_LENGTH64;
 798                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 799         }
 800         file->mode = mode;
 801         if (preserve_uid)
 802                 F_OWNER(file) = uid;
 803         if (preserve_gid)
 804                 F_GROUP(file) = gid;
 805
 806         if (basename != thisname) {
 807                 file->dirname = lastdir;
 808                 F_DEPTH(file) = lastdir_depth + 1;
 809         } else
 810                 F_DEPTH(file) = 1;
 811
 812         if (S_ISDIR(mode)) {
 813                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 814                         F_DEPTH(file)--;
 815                 if (flags & XMIT_TOP_DIR) {
 816                         in_del_hier = recurse;
 817                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 818                         if (relative_paths && del_hier_name_len > 2
 819                             && lastname[del_hier_name_len-1] == '.'
 820                             && lastname[del_hier_name_len-2] == '/')
 821                                 del_hier_name_len -= 2;
 822                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 823                 } else if (in_del_hier) {
 824                         if (!relative_paths || !del_hier_name_len
 825                          || (l1 >= del_hier_name_len
 826                           && lastname[del_hier_name_len] == '/'))
 827                                 file->flags |= FLAG_XFER_DIR;
 828                         else
 829                                 in_del_hier = 0;
 830                 }
 831         }
 832
 833         if ((preserve_devices && IS_DEVICE(mode))
 834          || (preserve_specials && IS_SPECIAL(mode))) {
 835                 uint32 *devp = F_RDEV_P(file);
 836                 DEV_MAJOR(devp) = major(rdev);
 837                 DEV_MINOR(devp) = minor(rdev);
 838         }
 839
 840 #ifdef SUPPORT_LINKS
 841         if (linkname_len) {
 842                 bp = (char*)file->basename + basename_len;
 843                 if (first_hlink_ndx >= 0) {
 844                         struct file_struct *first = flist->files[first_hlink_ndx];
 845                         memcpy(bp, F_SYMLINK(first), linkname_len);
 846                 } else
 847                         read_sbuf(f, bp, linkname_len - 1);
 848                 if (sanitize_paths)
 849                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 850         }
 851 #endif
 852
 853 #ifdef SUPPORT_HARD_LINKS
 854         if (preserve_hard_links && flags & XMIT_HLINKED) {
 855                 if (protocol_version >= 30) {
 856                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 857                                         ? flist->count : first_hlink_ndx;
 858                 } else {
 859                         static int32 cnt = 0;
 860                         struct idev_node *np;
 861                         int64 ino;
 862                         int32 ndx;
 863                         if (protocol_version < 26) {
 864                                 dev = read_int(f);
 865                                 ino = read_int(f);
 866                         } else {
 867                                 if (!(flags & XMIT_SAME_DEV_pre30))
 868                                         dev = read_longint(f);
 869                                 ino = read_longint(f);
 870                         }
 871                         np = idev_node(dev, ino);
 872                         ndx = (int32)(long)np->data - 1;
 873                         if (ndx < 0) {
 874                                 ndx = cnt++;
 875                                 np->data = (void*)(long)cnt;
 876                         }
 877                         F_HL_GNUM(file) = ndx;
 878                 }
 879         }
 880 #endif
 881
 882         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 883                 if (S_ISREG(mode))
 884                         bp = (char*)F_SUM(file);
 885                 else {
 886                         /* Prior to 28, we get a useless set of nulls. */
 887                         bp = tmp_sum;
 888                 }
 889                 if (first_hlink_ndx >= 0) {
 890                         struct file_struct *first = flist->files[first_hlink_ndx];
 891                         memcpy(bp, F_SUM(first), checksum_len);
 892                 } else
 893                         read_buf(f, bp, checksum_len);
 894         }
 895
 896 #ifdef SUPPORT_ACLS
 897         if (preserve_acls && !S_ISLNK(mode))
 898                 receive_acl(file, f);
 899 #endif
 900 #ifdef SUPPORT_XATTRS
 901         if (preserve_xattrs)
 902                 receive_xattr(file, f );
 903 #endif
 904
 905         if (S_ISREG(mode) || S_ISLNK(mode))
 906                 stats.total_size += file_length;
 907
 908         return file;
 909 }
 910
 911 /**
 912  * Create a file_struct for a named file by reading its stat()
 913  * information and performing extensive checks against global
 914  * options.
 915  *
 916  * @return the new file, or NULL if there was an error or this file
 917  * should be excluded.
 918  *
 919  * @todo There is a small optimization opportunity here to avoid
 920  * stat()ing the file in some circumstances, which has a certain cost.
 921  * We are called immediately after doing readdir(), and so we may
 922  * already know the d_type of the file.  We could for example avoid
 923  * statting directories if we're not recursing, but this is not a very
 924  * important case.  Some systems may not have d_type.
 925  **/
 926 struct file_struct *make_file(const char *fname, struct file_list *flist,
 927                               STRUCT_STAT *stp, int flags, int filter_level)
 928 {
 929         static char *lastdir;
 930         static int lastdir_len = -1;
 931         struct file_struct *file;
 932         STRUCT_STAT st;
 933         char thisname[MAXPATHLEN];
 934         char linkname[MAXPATHLEN];
 935         int alloc_len, basename_len, linkname_len;
 936         int extra_len = file_extra_cnt * EXTRA_LEN;
 937         const char *basename;
 938         char *bp;
 939
 940         if (strlcpy(thisname, fname, sizeof thisname)
 941             >= sizeof thisname - flist_dir_len) {
 942                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 943                 return NULL;
 944         }
 945         clean_fname(thisname, 0);
 946         if (sanitize_paths)
 947                 sanitize_path(thisname, thisname, "", 0, NULL);
 948
 949         if (stp && S_ISDIR(stp->st_mode)) {
 950                 st = *stp; /* Needed for "symlink/." with --relative. */
 951                 *linkname = '\0'; /* make IBM code checker happy */
 952         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 953                 int save_errno = errno;
 954                 /* See if file is excluded before reporting an error. */
 955                 if (filter_level != NO_FILTERS
 956                  && (is_excluded(thisname, 0, filter_level)
 957                   || is_excluded(thisname, 1, filter_level))) {
 958                         if (ignore_perishable && save_errno != ENOENT)
 959                                 non_perishable_cnt++;
 960                         return NULL;
 961                 }
 962                 if (save_errno == ENOENT) {
 963 #ifdef SUPPORT_LINKS
 964                         /* Avoid "vanished" error if symlink points nowhere. */
 965                         if (copy_links && do_lstat(thisname, &st) == 0
 966                             && S_ISLNK(st.st_mode)) {
 967                                 io_error |= IOERR_GENERAL;
 968                                 rprintf(FERROR, "symlink has no referent: %s\n",
 969                                         full_fname(thisname));
 970                         } else
 971 #endif
 972                         {
 973                                 enum logcode c = am_daemon && protocol_version < 28
 974                                     ? FERROR : FINFO;
 975                                 io_error |= IOERR_VANISHED;
 976                                 rprintf(c, "file has vanished: %s\n",
 977                                         full_fname(thisname));
 978                         }
 979                 } else {
 980                         io_error |= IOERR_GENERAL;
 981                         rsyserr(FERROR, save_errno, "readlink %s failed",
 982                                 full_fname(thisname));
 983                 }
 984                 return NULL;
 985         }
 986
 987         /* backup.c calls us with filter_level set to NO_FILTERS. */
 988         if (filter_level == NO_FILTERS)
 989                 goto skip_filters;
 990
 991         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 992                 rprintf(FINFO, "skipping directory %s\n", thisname);
 993                 return NULL;
 994         }
 995
 996         /* -x only affects directories because we need to avoid recursing
 997          * into a mount-point directory, not to avoid copying a symlinked
 998          * file if -L (or similar) was specified. */
 999         if (one_file_system && st.st_dev != filesystem_dev
1000          && S_ISDIR(st.st_mode)) {
1001                 if (one_file_system > 1) {
1002                         if (verbose > 2) {
1003                                 rprintf(FINFO, "skipping mount-point dir %s\n",
1004                                         thisname);
1005                         }
1006                         return NULL;
1007                 }
1008                 flags |= FLAG_MOUNT_DIR;
1009         }
1010
1011         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1012                 if (ignore_perishable)
1013                         non_perishable_cnt++;
1014                 return NULL;
1015         }
1016
1017         if (lp_ignore_nonreadable(module_id)) {
1018 #ifdef SUPPORT_LINKS
1019                 if (!S_ISLNK(st.st_mode))
1020 #endif
1021                         if (access(thisname, R_OK) != 0)
1022                                 return NULL;
1023         }
1024
1025   skip_filters:
1026
1027         /* Only divert a directory in the main transfer. */
1028         if (flist && flist->prev && S_ISDIR(st.st_mode)
1029          && flags & FLAG_DIVERT_DIRS) {
1030                 flist = dir_flist;
1031                 /* Room for parent/sibling/next-child info. */
1032                 extra_len += 3 * EXTRA_LEN;
1033         }
1034
1035         if (verbose > 2) {
1036                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1037                         who_am_i(), thisname, filter_level);
1038         }
1039
1040         if ((basename = strrchr(thisname, '/')) != NULL) {
1041                 int len = basename++ - thisname;
1042                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1043                         lastdir = new_array(char, len + 1);
1044                         memcpy(lastdir, thisname, len);
1045                         lastdir[len] = '\0';
1046                         lastdir_len = len;
1047                 }
1048         } else
1049                 basename = thisname;
1050         basename_len = strlen(basename) + 1; /* count the '\0' */
1051
1052 #ifdef SUPPORT_LINKS
1053         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1054 #else
1055         linkname_len = 0;
1056 #endif
1057
1058         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1059                 extra_len += EXTRA_LEN;
1060
1061 #if EXTRA_ROUNDING > 0
1062         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1063                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1064 #endif
1065
1066         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1067                   + linkname_len;
1068         if (flist)
1069                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1070         else {
1071                 if (!(bp = new_array(char, alloc_len)))
1072                         out_of_memory("make_file");
1073         }
1074
1075         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1076         bp += extra_len;
1077         file = (struct file_struct *)bp;
1078         bp += FILE_STRUCT_LEN;
1079
1080         memcpy(bp, basename, basename_len);
1081         bp += basename_len + linkname_len; /* skip space for symlink too */
1082
1083 #ifdef SUPPORT_HARD_LINKS
1084         if (preserve_hard_links && flist && flist->prev) {
1085                 if (protocol_version >= 28
1086                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1087                  : S_ISREG(st.st_mode)) {
1088                         tmp_dev = st.st_dev;
1089                         tmp_ino = st.st_ino;
1090                 } else
1091                         tmp_dev = 0;
1092         }
1093 #endif
1094
1095 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1096         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1097                 tmp_rdev = st.st_rdev;
1098                 st.st_size = 0;
1099         }
1100 #endif
1101
1102         file->flags = flags;
1103         file->modtime = st.st_mtime;
1104         file->len32 = (uint32)st.st_size;
1105         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1106                 file->flags |= FLAG_LENGTH64;
1107                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1108         }
1109         file->mode = st.st_mode;
1110         if (preserve_uid)
1111                 F_OWNER(file) = st.st_uid;
1112         if (preserve_gid)
1113                 F_GROUP(file) = st.st_gid;
1114
1115         if (basename != thisname)
1116                 file->dirname = lastdir;
1117
1118 #ifdef SUPPORT_LINKS
1119         if (linkname_len) {
1120                 bp = (char*)file->basename + basename_len;
1121                 memcpy(bp, linkname, linkname_len);
1122         }
1123 #endif
1124
1125         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1126                 file_checksum(thisname, tmp_sum, st.st_size);
1127
1128         F_ROOTDIR(file) = flist_dir;
1129
1130         /* This code is only used by the receiver when it is building
1131          * a list of files for a delete pass. */
1132         if (keep_dirlinks && linkname_len && flist) {
1133                 STRUCT_STAT st2;
1134                 int save_mode = file->mode;
1135                 file->mode = S_IFDIR; /* Find a directory with our name. */
1136                 if (flist_find(dir_flist, file) >= 0
1137                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
1138                         file->modtime = st2.st_mtime;
1139                         file->len32 = 0;
1140                         file->mode = st2.st_mode;
1141                         if (preserve_uid)
1142                                 F_OWNER(file) = st2.st_uid;
1143                         if (preserve_gid)
1144                                 F_GROUP(file) = st2.st_gid;
1145                 } else
1146                         file->mode = save_mode;
1147         }
1148
1149         if (basename_len == 0+1)
1150                 return NULL;
1151
1152         if (inc_recurse && flist == dir_flist) {
1153                 flist_expand(flist);
1154                 flist->files[flist->count++] = file;
1155         }
1156
1157         return file;
1158 }
1159
1160 /* Only called for temporary file_struct entries created by make_file(). */
1161 void unmake_file(struct file_struct *file)
1162 {
1163         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1164 #if EXTRA_ROUNDING > 0
1165         if (extra_cnt & EXTRA_ROUNDING)
1166                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1167 #endif
1168         free(REQ_EXTRA(file, extra_cnt));
1169 }
1170
1171 static struct file_struct *send_file_name(int f, struct file_list *flist,
1172                                           char *fname, STRUCT_STAT *stp,
1173                                           int flags, int filter_flags)
1174 {
1175         struct file_struct *file;
1176 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1177         statx sx;
1178 #endif
1179
1180         file = make_file(fname, flist, stp, flags, filter_flags);
1181         if (!file)
1182                 return NULL;
1183
1184         if (chmod_modes && !S_ISLNK(file->mode))
1185                 file->mode = tweak_mode(file->mode, chmod_modes);
1186
1187 #ifdef SUPPORT_ACLS
1188         if (preserve_acls && !S_ISLNK(file->mode) && f >= 0) {
1189                 sx.st.st_mode = file->mode;
1190                 sx.acc_acl = sx.def_acl = NULL;
1191                 if (get_acl(fname, &sx) < 0)
1192                         return NULL;
1193         }
1194 #endif
1195 #ifdef SUPPORT_XATTRS
1196         if (preserve_xattrs && f >= 0) {
1197                 sx.xattr = NULL;
1198                 if (get_xattr(fname, &sx) < 0)
1199                         return NULL;
1200         }
1201 #endif
1202
1203         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1204
1205         flist_expand(flist);
1206         flist->files[flist->count++] = file;
1207         if (f >= 0) {
1208                 send_file_entry(f, file, flist->count - 1);
1209 #ifdef SUPPORT_ACLS
1210                 if (preserve_acls && !S_ISLNK(file->mode)) {
1211                         send_acl(&sx, f);
1212                         free_acl(&sx);
1213                 }
1214 #endif
1215 #ifdef SUPPORT_XATTRS
1216                 if (preserve_xattrs) {
1217                         F_XATTR(file) = send_xattr(&sx, f);
1218                         free_xattr(&sx);
1219                 }
1220 #endif
1221         }
1222         return file;
1223 }
1224
1225 static void send_if_directory(int f, struct file_list *flist,
1226                               struct file_struct *file,
1227                               char *fbuf, unsigned int ol,
1228                               int flags)
1229 {
1230         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1231
1232         if (S_ISDIR(file->mode)
1233             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1234                 void *save_filters;
1235                 unsigned int len = strlen(fbuf);
1236                 if (len > 1 && fbuf[len-1] == '/')
1237                         fbuf[--len] = '\0';
1238                 if (len >= MAXPATHLEN - 1) {
1239                         io_error |= IOERR_GENERAL;
1240                         rprintf(FERROR, "skipping long-named directory: %s\n",
1241                                 full_fname(fbuf));
1242                         return;
1243                 }
1244                 save_filters = push_local_filters(fbuf, len);
1245                 send_directory(f, flist, -1, fbuf, len, flags);
1246                 pop_local_filters(save_filters);
1247                 fbuf[ol] = '\0';
1248                 if (is_dot_dir)
1249                         fbuf[ol-1] = '.';
1250         }
1251 }
1252
1253 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1254 {
1255         return f_name_cmp(*file1, *file2);
1256 }
1257
1258 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1259  * sort them by name, and link them into the tree, setting the appropriate
1260  * parent/child/sibling pointers. */
1261 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1262 {
1263         int i;
1264         int32 *dp = NULL;
1265         int32 *parent_dp = parent_ndx < 0 ? NULL
1266                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1267
1268         qsort(dir_flist->files + start, end - start + 1,
1269               sizeof dir_flist->files[0], (int (*)())file_compare);
1270
1271         for (i = start; i <= end; i++) {
1272                 struct file_struct *file = dir_flist->files[i];
1273                 if (!(file->flags & FLAG_XFER_DIR)
1274                  || file->flags & FLAG_MOUNT_DIR)
1275                         continue;
1276                 if (dp)
1277                         DIR_NEXT_SIBLING(dp) = i;
1278                 else if (parent_dp)
1279                         DIR_FIRST_CHILD(parent_dp) = i;
1280                 else
1281                         send_dir_ndx = i;
1282                 dp = F_DIRNODE_P(file);
1283                 DIR_PARENT(dp) = parent_ndx;
1284                 DIR_FIRST_CHILD(dp) = -1;
1285         }
1286         if (dp)
1287                 DIR_NEXT_SIBLING(dp) = -1;
1288 }
1289
1290 /* This function is normally called by the sender, but the receiving side also
1291  * calls it from get_dirlist() with f set to -1 so that we just construct the
1292  * file list in memory without sending it over the wire.  Also, get_dirlist()
1293  * might call this with f set to -2, which also indicates that local filter
1294  * rules should be ignored. */
1295 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1296                            char *fbuf, int len, int flags)
1297 {
1298         struct dirent *di;
1299         unsigned remainder;
1300         char *p;
1301         DIR *d;
1302         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1303         int start = divert_dirs ? dir_flist->count : flist->count;
1304         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1305
1306         assert(flist != NULL);
1307
1308         if (!(d = opendir(fbuf))) {
1309                 io_error |= IOERR_GENERAL;
1310                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1311                 return;
1312         }
1313
1314         p = fbuf + len;
1315         if (len != 1 || *fbuf != '/')
1316                 *p++ = '/';
1317         *p = '\0';
1318         remainder = MAXPATHLEN - (p - fbuf);
1319
1320         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1321                 char *dname = d_name(di);
1322                 if (dname[0] == '.' && (dname[1] == '\0'
1323                     || (dname[1] == '.' && dname[2] == '\0')))
1324                         continue;
1325                 if (strlcpy(p, dname, remainder) >= remainder) {
1326                         io_error |= IOERR_GENERAL;
1327                         rprintf(FINFO,
1328                                 "cannot send long-named file %s\n",
1329                                 full_fname(fbuf));
1330                         continue;
1331                 }
1332
1333                 send_file_name(f, flist, fbuf, NULL, flags, filter_flags);
1334         }
1335
1336         fbuf[len] = '\0';
1337
1338         if (errno) {
1339                 io_error |= IOERR_GENERAL;
1340                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1341         }
1342
1343         closedir(d);
1344
1345         if (f < 0)
1346                 return;
1347
1348         if (divert_dirs)
1349                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1350         else if (recurse) {
1351                 int i, end = flist->count - 1;
1352                 /* send_if_directory() bumps flist->count, so use "end". */
1353                 for (i = start; i <= end; i++)
1354                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1355         }
1356 }
1357
1358 void send_extra_file_list(int f, int at_least)
1359 {
1360         char fbuf[MAXPATHLEN];
1361         struct file_list *flist;
1362         int64 start_write;
1363         int future_cnt, save_io_error = io_error;
1364
1365         if (flist_eof)
1366                 return;
1367
1368         /* Keep sending data until we have the requested number of
1369          * files in the upcoming file-lists. */
1370         if (cur_flist->next) {
1371                 flist = first_flist->prev; /* the newest flist */
1372                 future_cnt = flist->count
1373                            + flist->ndx_start - cur_flist->next->ndx_start;
1374         } else
1375                 future_cnt = 0;
1376         while (future_cnt < at_least) {
1377                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1378                 int32 *dp;
1379                 int dlen;
1380
1381                 f_name(file, fbuf);
1382                 dlen = strlen(fbuf);
1383
1384                 if (F_ROOTDIR(file) != flist_dir) {
1385                         if (!push_flist_dir(F_ROOTDIR(file), -1))
1386                                 exit_cleanup(RERR_FILESELECT);
1387                 }
1388
1389                 flist = flist_new(0, "send_extra_file_list");
1390                 start_write = stats.total_written;
1391
1392                 write_ndx(f, NDX_FLIST_OFFSET - send_dir_ndx);
1393                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1394                 send_directory(f, flist, send_dir_ndx, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1395                 write_byte(f, 0);
1396
1397                 clean_flist(flist, 0, 0);
1398                 file_total += flist->count;
1399                 future_cnt += flist->count;
1400                 stats.flist_size += stats.total_written - start_write;
1401                 stats.num_files += flist->count;
1402                 if (verbose > 3)
1403                         output_flist(flist);
1404
1405                 dp = F_DIRNODE_P(file);
1406                 if (DIR_FIRST_CHILD(dp) >= 0) {
1407                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1408                         send_dir_depth++;
1409                 } else {
1410                         while (DIR_NEXT_SIBLING(dp) < 0) {
1411                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1412                                         write_ndx(f, NDX_FLIST_EOF);
1413                                         flist_eof = 1;
1414                                         change_local_filter_dir(NULL, 0, 0);
1415                                         goto finish;
1416                                 }
1417                                 send_dir_depth--;
1418                                 file = dir_flist->files[send_dir_ndx];
1419                                 dp = F_DIRNODE_P(file);
1420                         }
1421                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1422                 }
1423         }
1424
1425   finish:
1426         if (io_error != save_io_error && !ignore_errors)
1427                 send_msg_int(MSG_IO_ERROR, io_error);
1428 }
1429
1430 struct file_list *send_file_list(int f, int argc, char *argv[])
1431 {
1432         int len;
1433         STRUCT_STAT st;
1434         char *p, *dir;
1435         char lastpath[MAXPATHLEN] = "";
1436         struct file_list *flist;
1437         struct timeval start_tv, end_tv;
1438         int64 start_write;
1439         int use_ff_fd = 0;
1440         int flags, disable_buffering;
1441
1442         rprintf(FLOG, "building file list\n");
1443         if (show_filelist_p())
1444                 start_filelist_progress("building file list");
1445         else if (inc_recurse && verbose && !am_server)
1446                 rprintf(FCLIENT, "sending incremental file list\n");
1447
1448         start_write = stats.total_written;
1449         gettimeofday(&start_tv, NULL);
1450
1451 #ifdef SUPPORT_HARD_LINKS
1452         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1453                 init_hard_links();
1454 #endif
1455
1456         flist = cur_flist = flist_new(0, "send_file_list");
1457         if (inc_recurse) {
1458                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1459                 flags = FLAG_DIVERT_DIRS;
1460         } else {
1461                 dir_flist = cur_flist;
1462                 flags = 0;
1463         }
1464
1465         disable_buffering = io_start_buffering_out(f);
1466         if (filesfrom_fd >= 0) {
1467                 if (argv[0] && !push_dir(argv[0], 0)) {
1468                         rsyserr(FERROR, errno, "push_dir %s failed in %s",
1469                                 full_fname(argv[0]), curr_dir);
1470                         exit_cleanup(RERR_FILESELECT);
1471                 }
1472                 use_ff_fd = 1;
1473         }
1474
1475         while (1) {
1476                 char fbuf[MAXPATHLEN];
1477                 char *fn;
1478                 int is_dot_dir;
1479
1480                 if (use_ff_fd) {
1481                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1482                                 break;
1483                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1484                 } else {
1485                         if (argc-- == 0)
1486                                 break;
1487                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1488                         if (sanitize_paths)
1489                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1490                 }
1491
1492                 len = strlen(fbuf);
1493                 if (relative_paths) {
1494                         /* We clean up fbuf below. */
1495                         is_dot_dir = 0;
1496                 } else if (!len || fbuf[len - 1] == '/') {
1497                         if (len == 2 && fbuf[0] == '.') {
1498                                 /* Turn "./" into just "." rather than "./." */
1499                                 fbuf[1] = '\0';
1500                         } else {
1501                                 if (len + 1 >= MAXPATHLEN)
1502                                         overflow_exit("send_file_list");
1503                                 fbuf[len++] = '.';
1504                                 fbuf[len] = '\0';
1505                         }
1506                         is_dot_dir = 1;
1507                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1508                     && (len == 2 || fbuf[len-3] == '/')) {
1509                         if (len + 2 >= MAXPATHLEN)
1510                                 overflow_exit("send_file_list");
1511                         fbuf[len++] = '/';
1512                         fbuf[len++] = '.';
1513                         fbuf[len] = '\0';
1514                         is_dot_dir = 1;
1515                 } else {
1516                         is_dot_dir = fbuf[len-1] == '.'
1517                                    && (len == 1 || fbuf[len-2] == '/');
1518                 }
1519
1520                 dir = NULL;
1521
1522                 if (!relative_paths) {
1523                         p = strrchr(fbuf, '/');
1524                         if (p) {
1525                                 *p = '\0';
1526                                 if (p == fbuf)
1527                                         dir = "/";
1528                                 else
1529                                         dir = fbuf;
1530                                 len -= p - fbuf + 1;
1531                                 fn = p + 1;
1532                         } else
1533                                 fn = fbuf;
1534                 } else {
1535                         if ((p = strstr(fbuf, "/./")) != NULL) {
1536                                 *p = '\0';
1537                                 if (p == fbuf)
1538                                         dir = "/";
1539                                 else
1540                                         dir = fbuf;
1541                                 len -= p - fbuf + 3;
1542                                 fn = p + 3;
1543                         } else
1544                                 fn = fbuf;
1545                         /* Get rid of trailing "/" and "/.". */
1546                         while (len) {
1547                                 if (fn[len - 1] == '/') {
1548                                         is_dot_dir = 1;
1549                                         if (!--len && !dir) {
1550                                                 len++;
1551                                                 break;
1552                                         }
1553                                 }
1554                                 else if (len >= 2 && fn[len - 1] == '.'
1555                                                   && fn[len - 2] == '/') {
1556                                         is_dot_dir = 1;
1557                                         if (!(len -= 2) && !dir) {
1558                                                 len++;
1559                                                 break;
1560                                         }
1561                                 } else
1562                                         break;
1563                         }
1564                         if (len == 1 && fn[0] == '/')
1565                                 fn[len++] = '.';
1566                         fn[len] = '\0';
1567                         /* Reject a ".." dir in the active part of the path. */
1568                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1569                                 if ((p[2] == '/' || p[2] == '\0')
1570                                  && (p == fn || p[-1] == '/')) {
1571                                         rprintf(FERROR,
1572                                             "found \"..\" dir in relative path: %s\n",
1573                                             fbuf);
1574                                         exit_cleanup(RERR_SYNTAX);
1575                                 }
1576                         }
1577                 }
1578
1579                 if (!*fn) {
1580                         len = 1;
1581                         fn = ".";
1582                 }
1583
1584                 if (dir && *dir) {
1585                         static const char *lastdir;
1586                         static int lastdir_len = -1;
1587                         int len = strlen(dir);
1588
1589                         if (len != lastdir_len || memcmp(lastdir, dir, len) != 0) {
1590                                 if (!push_flist_dir(strdup(dir), len))
1591                                         goto push_error;
1592                                 lastdir = flist_dir;
1593                                 lastdir_len = flist_dir_len;
1594                         } else if (!push_flist_dir(lastdir, lastdir_len)) {
1595                           push_error:
1596                                 io_error |= IOERR_GENERAL;
1597                                 rsyserr(FERROR, errno, "push_dir %s failed in %s",
1598                                         full_fname(dir), curr_dir);
1599                                 continue;
1600                         }
1601                 }
1602
1603                 if (fn != fbuf)
1604                         memmove(fbuf, fn, len + 1);
1605
1606                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1607                         io_error |= IOERR_GENERAL;
1608                         rsyserr(FERROR, errno, "link_stat %s failed",
1609                                 full_fname(fbuf));
1610                         continue;
1611                 }
1612
1613                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1614                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1615                         continue;
1616                 }
1617
1618                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1619                         /* Send the implied directories at the start of the
1620                          * source spec, so we get their permissions right. */
1621                         char *lp = lastpath, *slash = fbuf;
1622                         *p = '\0';
1623                         /* Skip any initial directories in our path that we
1624                          * have in common with lastpath. */
1625                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1626                                 if (*fn == '/')
1627                                         slash = fn;
1628                         }
1629                         *p = '/';
1630                         if (fn != p || (*lp && *lp != '/')) {
1631                                 int save_copy_links = copy_links;
1632                                 int save_xfer_dirs = xfer_dirs;
1633                                 int dir_flags = inc_recurse ? FLAG_DIVERT_DIRS : 0;
1634                                 copy_links |= copy_unsafe_links;
1635                                 xfer_dirs = 1;
1636                                 while ((slash = strchr(slash+1, '/')) != 0) {
1637                                         *slash = '\0';
1638                                         send_file_name(f, flist, fbuf, NULL,
1639                                                        dir_flags, ALL_FILTERS);
1640                                         *slash = '/';
1641                                 }
1642                                 copy_links = save_copy_links;
1643                                 xfer_dirs = save_xfer_dirs;
1644                                 *p = '\0';
1645                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1646                                 *p = '/';
1647                         }
1648                 }
1649
1650                 if (one_file_system)
1651                         filesystem_dev = st.st_dev;
1652
1653                 if (recurse || (xfer_dirs && is_dot_dir)) {
1654                         struct file_struct *file;
1655                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR
1656                                       | (is_dot_dir ? 0 : flags)
1657                                       | (inc_recurse ? FLAG_DIVERT_DIRS : 0);
1658                         file = send_file_name(f, flist, fbuf, &st,
1659                                               top_flags, ALL_FILTERS);
1660                         if (file && !inc_recurse)
1661                                 send_if_directory(f, flist, file, fbuf, len, flags);
1662                 } else
1663                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1664         }
1665
1666         gettimeofday(&end_tv, NULL);
1667         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1668                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1669         if (stats.flist_buildtime == 0)
1670                 stats.flist_buildtime = 1;
1671         start_tv = end_tv;
1672
1673         write_byte(f, 0); /* Indicate end of file list */
1674
1675 #ifdef SUPPORT_HARD_LINKS
1676         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1677                 idev_destroy();
1678 #endif
1679
1680         if (show_filelist_p())
1681                 finish_filelist_progress(flist);
1682
1683         gettimeofday(&end_tv, NULL);
1684         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1685                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1686
1687         /* Sort the list without removing any duplicates in non-incremental
1688          * mode.  This allows the receiving side to ask for whatever name it
1689          * kept.  For incremental mode, the sender also removes duplicates
1690          * in this initial file-list so that it avoids re-sending duplicated
1691          * directories. */
1692         clean_flist(flist, 0, inc_recurse);
1693         file_total += flist->count;
1694
1695         if (!numeric_ids && !inc_recurse)
1696                 send_uid_list(f);
1697
1698         /* send the io_error flag */
1699         if (protocol_version < 30)
1700                 write_int(f, ignore_errors ? 0 : io_error);
1701         else if (io_error && !ignore_errors)
1702                 send_msg_int(MSG_IO_ERROR, io_error);
1703
1704         if (disable_buffering)
1705                 io_end_buffering_out();
1706
1707         stats.flist_size = stats.total_written - start_write;
1708         stats.num_files = flist->count;
1709
1710         if (verbose > 3)
1711                 output_flist(flist);
1712
1713         if (verbose > 2)
1714                 rprintf(FINFO, "send_file_list done\n");
1715
1716         if (inc_recurse) {
1717                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1718                 if (send_dir_ndx < 0) {
1719                         write_ndx(f, NDX_FLIST_EOF);
1720                         flist_eof = 1;
1721                 }
1722                 else if (file_total == 1) {
1723                         /* If we're creating incremental file-lists and there
1724                          * was just 1 item in the first file-list, send 1 more
1725                          * file-list to check if this is a 1-file xfer. */
1726                         send_extra_file_list(f, 1);
1727                 }
1728         }
1729
1730         return flist;
1731 }
1732
1733 struct file_list *recv_file_list(int f)
1734 {
1735         struct file_list *flist;
1736         int dstart, flags;
1737         int64 start_read;
1738
1739         if (!first_flist)
1740                 rprintf(FLOG, "receiving file list\n");
1741         if (show_filelist_p())
1742                 start_filelist_progress("receiving file list");
1743         else if (inc_recurse && verbose && !am_server && !first_flist)
1744                 rprintf(FCLIENT, "receiving incremental file list\n");
1745
1746         start_read = stats.total_read;
1747
1748         flist = flist_new(0, "recv_file_list");
1749
1750 #ifdef SUPPORT_HARD_LINKS
1751         if (preserve_hard_links && protocol_version < 30)
1752                 init_hard_links();
1753 #endif
1754
1755         if (inc_recurse) {
1756                 if (flist->ndx_start == 0)
1757                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1758                 dstart = dir_flist->count;
1759         } else {
1760                 dir_flist = flist;
1761                 dstart = 0;
1762         }
1763
1764         while ((flags = read_byte(f)) != 0) {
1765                 struct file_struct *file;
1766
1767                 flist_expand(flist);
1768
1769                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1770                         flags |= read_byte(f) << 8;
1771                 file = recv_file_entry(flist, flags, f);
1772
1773                 if (inc_recurse && S_ISDIR(file->mode)) {
1774                         flist_expand(dir_flist);
1775                         dir_flist->files[dir_flist->count++] = file;
1776                 }
1777
1778                 flist->files[flist->count++] = file;
1779
1780                 maybe_emit_filelist_progress(flist->count);
1781
1782                 if (verbose > 2) {
1783                         rprintf(FINFO, "recv_file_name(%s)\n",
1784                                 f_name(file, NULL));
1785                 }
1786         }
1787         file_total += flist->count;
1788
1789         if (verbose > 2)
1790                 rprintf(FINFO, "received %d names\n", flist->count);
1791
1792         if (show_filelist_p())
1793                 finish_filelist_progress(flist);
1794
1795         clean_flist(flist, relative_paths, 1);
1796
1797         if (inc_recurse) {
1798                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1799                       sizeof dir_flist->files[0], (int (*)())file_compare);
1800         } else if (f >= 0)
1801                 recv_uid_list(f, flist);
1802
1803         if (protocol_version < 30) {
1804                 /* Recv the io_error flag */
1805                 if (ignore_errors)
1806                         read_int(f);
1807                 else
1808                         io_error |= read_int(f);
1809         }
1810
1811         if (verbose > 3)
1812                 output_flist(flist);
1813
1814         if (list_only) {
1815                 int i;
1816                 for (i = 0; i < flist->count; i++)
1817                         list_file_entry(flist->files[i]);
1818         }
1819
1820         if (verbose > 2)
1821                 rprintf(FINFO, "recv_file_list done\n");
1822
1823         stats.flist_size += stats.total_read - start_read;
1824         stats.num_files += flist->count;
1825
1826         return flist;
1827 }
1828
1829 /* This is only used once by the receiver if the very first file-list
1830  * has exactly one item in it. */
1831 void recv_additional_file_list(int f)
1832 {
1833         struct file_list *flist;
1834         int ndx = read_ndx(f);
1835         if (ndx == NDX_FLIST_EOF) {
1836                 flist_eof = 1;
1837                 change_local_filter_dir(NULL, 0, 0);
1838         } else {
1839                 ndx = NDX_FLIST_OFFSET - ndx;
1840                 if (ndx < 0 || ndx >= dir_flist->count) {
1841                         ndx = NDX_FLIST_OFFSET - ndx;
1842                         rprintf(FERROR,
1843                                 "Invalid dir index: %d (%d - %d)\n",
1844                                 ndx, NDX_FLIST_OFFSET,
1845                                 NDX_FLIST_OFFSET - dir_flist->count);
1846                         exit_cleanup(RERR_PROTOCOL);
1847                 }
1848                 flist = recv_file_list(f);
1849                 flist->parent_ndx = ndx;
1850         }
1851 }
1852
1853 /* Search for an identically-named item in the file list.  Note that the
1854  * items must agree in their directory-ness, or no match is returned. */
1855 int flist_find(struct file_list *flist, struct file_struct *f)
1856 {
1857         int low = flist->low, high = flist->high;
1858         int diff, mid, mid_up;
1859
1860         while (low <= high) {
1861                 mid = (low + high) / 2;
1862                 if (F_IS_ACTIVE(flist->files[mid]))
1863                         mid_up = mid;
1864                 else {
1865                         /* Scan for the next non-empty entry using the cached
1866                          * distance values.  If the value isn't fully up-to-
1867                          * date, update it. */
1868                         mid_up = mid + F_DEPTH(flist->files[mid]);
1869                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1870                                 do {
1871                                     mid_up += F_DEPTH(flist->files[mid_up]);
1872                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1873                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1874                         }
1875                         if (mid_up > high) {
1876                                 /* If there's nothing left above us, set high to
1877                                  * a non-empty entry below us and continue. */
1878                                 high = mid - (int)flist->files[mid]->len32;
1879                                 if (!F_IS_ACTIVE(flist->files[high])) {
1880                                         do {
1881                                             high -= (int)flist->files[high]->len32;
1882                                         } while (!F_IS_ACTIVE(flist->files[high]));
1883                                         flist->files[mid]->len32 = mid - high;
1884                                 }
1885                                 continue;
1886                         }
1887                 }
1888                 diff = f_name_cmp(flist->files[mid_up], f);
1889                 if (diff == 0) {
1890                         if (protocol_version < 29
1891                             && S_ISDIR(flist->files[mid_up]->mode)
1892                             != S_ISDIR(f->mode))
1893                                 return -1;
1894                         return mid_up;
1895                 }
1896                 if (diff < 0)
1897                         low = mid_up + 1;
1898                 else
1899                         high = mid - 1;
1900         }
1901         return -1;
1902 }
1903
1904 /*
1905  * Free up any resources a file_struct has allocated
1906  * and clear the file.
1907  */
1908 void clear_file(struct file_struct *file)
1909 {
1910         /* The +1 zeros out the first char of the basename. */
1911         memset(file, 0, FILE_STRUCT_LEN + 1);
1912         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1913          * entry.  Likewise for len32 in the opposite direction.  We assume
1914          * that we're alone for now since flist_find() will adjust the counts
1915          * it runs into that aren't up-to-date. */
1916         file->len32 = F_DEPTH(file) = 1;
1917 }
1918
1919 /* Allocate a new file list. */
1920 struct file_list *flist_new(int flags, char *msg)
1921 {
1922         struct file_list *flist;
1923
1924         flist = new(struct file_list);
1925         if (!flist)
1926                 out_of_memory(msg);
1927
1928         memset(flist, 0, sizeof flist[0]);
1929
1930         if (!(flags & FLIST_TEMP)) {
1931                 if (first_flist) {
1932                         flist->ndx_start = first_flist->prev->ndx_start
1933                                          + first_flist->prev->count;
1934                 }
1935                 /* This is a doubly linked list with prev looping back to
1936                  * the end of the list, but the last next pointer is NULL. */
1937                 if (!first_flist)
1938                         first_flist = cur_flist = flist->prev = flist;
1939                 else {
1940                         flist->prev = first_flist->prev;
1941                         flist->prev->next = first_flist->prev = flist;
1942                 }
1943                 flist_cnt++;
1944         }
1945
1946         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1947                 out_of_memory(msg);
1948
1949         return flist;
1950 }
1951
1952 /* Free up all elements in a flist. */
1953 void flist_free(struct file_list *flist)
1954 {
1955         if (!flist->prev)
1956                 ; /* Was FLIST_TEMP dir-list. */
1957         else if (flist == flist->prev) {
1958                 first_flist = cur_flist = NULL;
1959                 file_total = 0;
1960                 flist_cnt = 0;
1961         } else {
1962                 if (flist == cur_flist)
1963                         cur_flist = flist->next;
1964                 if (flist == first_flist)
1965                         first_flist = first_flist->next;
1966                 else {
1967                         flist->prev->next = flist->next;
1968                         if (!flist->next)
1969                                 flist->next = first_flist;
1970                 }
1971                 flist->next->prev = flist->prev;
1972                 file_total -= flist->count;
1973                 flist_cnt--;
1974         }
1975
1976         pool_destroy(flist->file_pool);
1977         free(flist->files);
1978         free(flist);
1979 }
1980
1981 /*
1982  * This routine ensures we don't have any duplicate names in our file list.
1983  * duplicate names can cause corruption because of the pipelining
1984  */
1985 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1986 {
1987         char fbuf[MAXPATHLEN];
1988         int i, prev_i = 0;
1989
1990         if (!flist)
1991                 return;
1992         if (flist->count == 0) {
1993                 flist->high = -1;
1994                 return;
1995         }
1996
1997         qsort(flist->files, flist->count,
1998             sizeof flist->files[0], (int (*)())file_compare);
1999
2000         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
2001                 if (F_IS_ACTIVE(flist->files[i])) {
2002                         prev_i = i;
2003                         break;
2004                 }
2005         }
2006         flist->low = prev_i;
2007         while (++i < flist->count) {
2008                 int j;
2009                 struct file_struct *file = flist->files[i];
2010
2011                 if (!F_IS_ACTIVE(file))
2012                         continue;
2013                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
2014                         j = prev_i;
2015                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2016                         int save_mode = file->mode;
2017                         /* Make sure that this directory doesn't duplicate a
2018                          * non-directory earlier in the list. */
2019                         flist->high = prev_i;
2020                         file->mode = S_IFREG;
2021                         j = flist_find(flist, file);
2022                         file->mode = save_mode;
2023                 } else
2024                         j = -1;
2025                 if (j >= 0) {
2026                         struct file_struct *fp = flist->files[j];
2027                         int keep, drop;
2028                         /* If one is a dir and the other is not, we want to
2029                          * keep the dir because it might have contents in the
2030                          * list. */
2031                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
2032                                 if (S_ISDIR(file->mode))
2033                                         keep = i, drop = j;
2034                                 else
2035                                         keep = j, drop = i;
2036                         } else if (protocol_version < 27)
2037                                 keep = j, drop = i;
2038                         else
2039                                 keep = i, drop = j;
2040                         if (verbose > 1 && !am_server) {
2041                                 rprintf(FINFO,
2042                                         "removing duplicate name %s from file list (%d)\n",
2043                                         f_name(file, fbuf), drop);
2044                         }
2045                         /* Make sure we don't lose track of a user-specified
2046                          * top directory. */
2047                         flist->files[keep]->flags |= flist->files[drop]->flags
2048                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
2049
2050                         clear_file(flist->files[drop]);
2051
2052                         if (keep == i) {
2053                                 if (flist->low == drop) {
2054                                         for (j = drop + 1;
2055                                              j < i && !F_IS_ACTIVE(flist->files[j]);
2056                                              j++) {}
2057                                         flist->low = j;
2058                                 }
2059                                 prev_i = i;
2060                         }
2061                 } else
2062                         prev_i = i;
2063         }
2064         flist->high = no_dups ? prev_i : flist->count - 1;
2065
2066         if (strip_root) {
2067                 /* We need to strip off the leading slashes for relative
2068                  * paths, but this must be done _after_ the sorting phase. */
2069                 for (i = flist->low; i <= flist->high; i++) {
2070                         struct file_struct *file = flist->files[i];
2071
2072                         if (!file->dirname)
2073                                 continue;
2074                         while (*file->dirname == '/')
2075                                 file->dirname++;
2076                         if (!*file->dirname)
2077                                 file->dirname = NULL;
2078                 }
2079         }
2080
2081         if (prune_empty_dirs && no_dups) {
2082                 int j, prev_depth = 0;
2083
2084                 prev_i = 0; /* It's OK that this isn't really true. */
2085
2086                 for (i = flist->low; i <= flist->high; i++) {
2087                         struct file_struct *fp, *file = flist->files[i];
2088
2089                         /* This temporarily abuses the F_DEPTH() value for a
2090                          * directory that is in a chain that might get pruned.
2091                          * We restore the old value if it gets a reprieve. */
2092                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2093                                 /* Dump empty dirs when coming back down. */
2094                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2095                                         fp = flist->files[prev_i];
2096                                         if (F_DEPTH(fp) >= 0)
2097                                                 break;
2098                                         prev_i = -F_DEPTH(fp)-1;
2099                                         clear_file(fp);
2100                                 }
2101                                 prev_depth = F_DEPTH(file);
2102                                 if (is_excluded(f_name(file, fbuf), 1,
2103                                                        ALL_FILTERS)) {
2104                                         /* Keep dirs through this dir. */
2105                                         for (j = prev_depth-1; ; j--) {
2106                                                 fp = flist->files[prev_i];
2107                                                 if (F_DEPTH(fp) >= 0)
2108                                                         break;
2109                                                 prev_i = -F_DEPTH(fp)-1;
2110                                                 F_DEPTH(fp) = j;
2111                                         }
2112                                 } else
2113                                         F_DEPTH(file) = -prev_i-1;
2114                                 prev_i = i;
2115                         } else {
2116                                 /* Keep dirs through this non-dir. */
2117                                 for (j = prev_depth; ; j--) {
2118                                         fp = flist->files[prev_i];
2119                                         if (F_DEPTH(fp) >= 0)
2120                                                 break;
2121                                         prev_i = -F_DEPTH(fp)-1;
2122                                         F_DEPTH(fp) = j;
2123                                 }
2124                         }
2125                 }
2126                 /* Dump all remaining empty dirs. */
2127                 while (1) {
2128                         struct file_struct *fp = flist->files[prev_i];
2129                         if (F_DEPTH(fp) >= 0)
2130                                 break;
2131                         prev_i = -F_DEPTH(fp)-1;
2132                         clear_file(fp);
2133                 }
2134
2135                 for (i = flist->low; i <= flist->high; i++) {
2136                         if (F_IS_ACTIVE(flist->files[i]))
2137                                 break;
2138                 }
2139                 flist->low = i;
2140                 for (i = flist->high; i >= flist->low; i--) {
2141                         if (F_IS_ACTIVE(flist->files[i]))
2142                                 break;
2143                 }
2144                 flist->high = i;
2145         }
2146 }
2147
2148 static void output_flist(struct file_list *flist)
2149 {
2150         char uidbuf[16], gidbuf[16], depthbuf[16];
2151         struct file_struct *file;
2152         const char *root, *dir, *slash, *name, *trail;
2153         const char *who = who_am_i();
2154         int i;
2155
2156         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2157                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2158         for (i = 0; i < flist->count; i++) {
2159                 file = flist->files[i];
2160                 if ((am_root || am_sender) && preserve_uid) {
2161                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2162                                  (long)F_UID(file));
2163                 } else
2164                         *uidbuf = '\0';
2165                 if (preserve_gid && F_GID(file) != GID_NONE) {
2166                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2167                                  (long)F_GID(file));
2168                 } else
2169                         *gidbuf = '\0';
2170                 if (!am_sender)
2171                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2172                 if (F_IS_ACTIVE(file)) {
2173                         root = am_sender ? NS(F_ROOTDIR(file)) : depthbuf;
2174                         if ((dir = file->dirname) == NULL)
2175                                 dir = slash = "";
2176                         else
2177                                 slash = "/";
2178                         name = file->basename;
2179                         trail = S_ISDIR(file->mode) ? "/" : "";
2180                 } else
2181                         root = dir = slash = name = trail = "";
2182                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2183                         who, i, root, dir, slash, name, trail, (int)file->mode,
2184                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2185         }
2186 }
2187
2188 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2189 enum fnc_type { t_PATH, t_ITEM };
2190
2191 /* Compare the names of two file_struct entities, similar to how strcmp()
2192  * would do if it were operating on the joined strings.
2193  *
2194  * Some differences beginning with protocol_version 29: (1) directory names
2195  * are compared with an assumed trailing slash so that they compare in a
2196  * way that would cause them to sort immediately prior to any content they
2197  * may have; (2) a directory of any name compares after a non-directory of
2198  * any name at the same depth; (3) a directory with name "." compares prior
2199  * to anything else.  These changes mean that a directory and a non-dir
2200  * with the same name will not compare as equal (protocol_version >= 29).
2201  *
2202  * The dirname component can be an empty string, but the basename component
2203  * cannot (and never is in the current codebase).  The basename component
2204  * may be NULL (for a removed item), in which case it is considered to be
2205  * after any existing item. */
2206 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2207 {
2208         int dif;
2209         const uchar *c1, *c2;
2210         enum fnc_state state1, state2;
2211         enum fnc_type type1, type2;
2212         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2213
2214         if (!f1 || !F_IS_ACTIVE(f1)) {
2215                 if (!f2 || !F_IS_ACTIVE(f2))
2216                         return 0;
2217                 return -1;
2218         }
2219         if (!f2 || !F_IS_ACTIVE(f2))
2220                 return 1;
2221
2222         c1 = (uchar*)f1->dirname;
2223         c2 = (uchar*)f2->dirname;
2224         if (c1 == c2)
2225                 c1 = c2 = NULL;
2226         if (!c1) {
2227                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2228                 c1 = (const uchar*)f1->basename;
2229                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2230                         type1 = t_ITEM;
2231                         state1 = s_TRAILING;
2232                         c1 = (uchar*)"";
2233                 } else
2234                         state1 = s_BASE;
2235         } else {
2236                 type1 = t_path;
2237                 state1 = s_DIR;
2238         }
2239         if (!c2) {
2240                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2241                 c2 = (const uchar*)f2->basename;
2242                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2243                         type2 = t_ITEM;
2244                         state2 = s_TRAILING;
2245                         c2 = (uchar*)"";
2246                 } else
2247                         state2 = s_BASE;
2248         } else {
2249                 type2 = t_path;
2250                 state2 = s_DIR;
2251         }
2252
2253         if (type1 != type2)
2254                 return type1 == t_PATH ? 1 : -1;
2255
2256         do {
2257                 if (!*c1) {
2258                         switch (state1) {
2259                         case s_DIR:
2260                                 state1 = s_SLASH;
2261                                 c1 = (uchar*)"/";
2262                                 break;
2263                         case s_SLASH:
2264                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2265                                 c1 = (const uchar*)f1->basename;
2266                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2267                                         type1 = t_ITEM;
2268                                         state1 = s_TRAILING;
2269                                         c1 = (uchar*)"";
2270                                 } else
2271                                         state1 = s_BASE;
2272                                 break;
2273                         case s_BASE:
2274                                 state1 = s_TRAILING;
2275                                 if (type1 == t_PATH) {
2276                                         c1 = (uchar*)"/";
2277                                         break;
2278                                 }
2279                                 /* FALL THROUGH */
2280                         case s_TRAILING:
2281                                 type1 = t_ITEM;
2282                                 break;
2283                         }
2284                         if (*c2 && type1 != type2)
2285                                 return type1 == t_PATH ? 1 : -1;
2286                 }
2287                 if (!*c2) {
2288                         switch (state2) {
2289                         case s_DIR:
2290                                 state2 = s_SLASH;
2291                                 c2 = (uchar*)"/";
2292                                 break;
2293                         case s_SLASH:
2294                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2295                                 c2 = (const uchar*)f2->basename;
2296                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2297                                         type2 = t_ITEM;
2298                                         state2 = s_TRAILING;
2299                                         c2 = (uchar*)"";
2300                                 } else
2301                                         state2 = s_BASE;
2302                                 break;
2303                         case s_BASE:
2304                                 state2 = s_TRAILING;
2305                                 if (type2 == t_PATH) {
2306                                         c2 = (uchar*)"/";
2307                                         break;
2308                                 }
2309                                 /* FALL THROUGH */
2310                         case s_TRAILING:
2311                                 if (!*c1)
2312                                         return 0;
2313                                 type2 = t_ITEM;
2314                                 break;
2315                         }
2316                         if (type1 != type2)
2317                                 return type1 == t_PATH ? 1 : -1;
2318                 }
2319         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2320
2321         return dif;
2322 }
2323
2324 char *f_name_buf(void)
2325 {
2326         static char names[5][MAXPATHLEN];
2327         static unsigned int n;
2328
2329         n = (n + 1) % (sizeof names / sizeof names[0]);
2330
2331         return names[n];
2332 }
2333
2334 /* Return a copy of the full filename of a flist entry, using the indicated
2335  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2336  * done because we checked the size when creating the file_struct entry.
2337  */
2338 char *f_name(struct file_struct *f, char *fbuf)
2339 {
2340         if (!f || !F_IS_ACTIVE(f))
2341                 return NULL;
2342
2343         if (!fbuf)
2344                 fbuf = f_name_buf();
2345
2346         if (f->dirname) {
2347                 int len = strlen(f->dirname);
2348                 memcpy(fbuf, f->dirname, len);
2349                 fbuf[len] = '/';
2350                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2351         } else
2352                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2353
2354         return fbuf;
2355 }
2356
2357 /* Do a non-recursive scan of the named directory, possibly ignoring all
2358  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2359  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2360  * buffer (the functions we call will append names onto the end, but the old
2361  * dir value will be restored on exit). */
2362 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2363 {
2364         struct file_list *dirlist;
2365         char dirbuf[MAXPATHLEN];
2366         int save_recurse = recurse;
2367         int save_xfer_dirs = xfer_dirs;
2368
2369         if (dlen < 0) {
2370                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2371                 if (dlen >= MAXPATHLEN)
2372                         return NULL;
2373                 dirname = dirbuf;
2374         }
2375
2376         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2377
2378         recurse = 0;
2379         xfer_dirs = 1;
2380         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2381         xfer_dirs = save_xfer_dirs;
2382         recurse = save_recurse;
2383         if (do_progress)
2384                 flist_count_offset += dirlist->count;
2385
2386         clean_flist(dirlist, 0, 0);
2387
2388         if (verbose > 3)
2389                 output_flist(dirlist);
2390
2391         return dirlist;
2392 }