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 as published by
  11  * the Free Software Foundation; either version 3 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, visit the http://fsf.org website.
  21  */
  22
  23 #include "rsync.h"
  24 #include "ifuncs.h"
  25 #include "rounding.h"
  26 #include "io.h"
  27
  28 extern int verbose;
  29 extern int list_only;
  30 extern int am_root;
  31 extern int am_server;
  32 extern int am_daemon;
  33 extern int am_sender;
  34 extern int am_generator;
  35 extern int inc_recurse;
  36 extern int do_progress;
  37 extern int always_checksum;
  38 extern int module_id;
  39 extern int ignore_errors;
  40 extern int numeric_ids;
  41 extern int recurse;
  42 extern int use_qsort;
  43 extern int xfer_dirs;
  44 extern int filesfrom_fd;
  45 extern int one_file_system;
  46 extern int copy_dirlinks;
  47 extern int keep_dirlinks;
  48 extern int preserve_acls;
  49 extern int preserve_xattrs;
  50 extern int preserve_links;
  51 extern int preserve_hard_links;
  52 extern int preserve_devices;
  53 extern int preserve_specials;
  54 extern int uid_ndx;
  55 extern int gid_ndx;
  56 extern int eol_nulls;
  57 extern int relative_paths;
  58 extern int implied_dirs;
  59 extern int file_extra_cnt;
  60 extern int ignore_perishable;
  61 extern int non_perishable_cnt;
  62 extern int prune_empty_dirs;
  63 extern int copy_links;
  64 extern int copy_unsafe_links;
  65 extern int protocol_version;
  66 extern int sanitize_paths;
  67 extern struct stats stats;
  68 extern char *filesfrom_host;
  69
  70 extern char curr_dir[MAXPATHLEN];
  71
  72 extern struct chmod_mode_struct *chmod_modes;
  73
  74 extern struct filter_list_struct filter_list;
  75 extern struct filter_list_struct server_filter_list;
  76
  77 #ifdef ICONV_OPTION
  78 extern int ic_ndx;
  79 extern int filesfrom_convert;
  80 extern int need_unsorted_flist;
  81 extern iconv_t ic_send, ic_recv;
  82 #endif
  83
  84 #define PTR_SIZE (sizeof (struct file_struct *))
  85
  86 int io_error;
  87 int checksum_len;
  88 dev_t filesystem_dev; /* used to implement -x */
  89
  90 struct file_list *cur_flist, *first_flist, *dir_flist;
  91 int send_dir_ndx = -1, send_dir_depth = 0;
  92 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  93 int file_total = 0; /* total of all active items over all file-lists */
  94 int flist_eof = 0; /* all the file-lists are now known */
  95
  96 /* Starting from protocol version 26, we always use 64-bit ino_t and dev_t
  97  * internally, even if this platform does not allow files to have 64-bit inums.
  98  * The only exception is if we're on a platform with no 64-bit type at all.
  99  *
 100  * Because we use read_longint() to get these off the wire, if you transfer
 101  * devices or (for protocols < 30) hardlinks with dev or inum > 2**32 to a
 102  * machine with no 64-bit types then you will get an overflow error.
 103  *
 104  * Note that if you transfer devices from a 64-bit-devt machine (say, Solaris)
 105  * to a 32-bit-devt machine (say, Linux-2.2/x86) then the device numbers will
 106  * be truncated.  But it's a kind of silly thing to do anyhow. */
 107
 108 /* The tmp_* vars are used as a cache area by make_file() to store data
 109  * that the sender doesn't need to remember in its file list.  The data
 110  * will survive just long enough to be used by send_file_entry(). */
 111 static dev_t tmp_rdev;
 112 #ifdef SUPPORT_HARD_LINKS
 113 static int64 tmp_dev, tmp_ino;
 114 #endif
 115 static char tmp_sum[MAX_DIGEST_LEN];
 116
 117 static char empty_sum[MAX_DIGEST_LEN];
 118 static int flist_count_offset; /* for --delete --progress */
 119 static int dir_count = 0;
 120 static int high_hlink_ndx;
 121
 122 static void clean_flist(struct file_list *flist, int strip_root);
 123 static void output_flist(struct file_list *flist);
 124
 125 void init_flist(void)
 126 {
 127         if (verbose > 4) {
 128                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 129                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 130         }
 131         checksum_len = protocol_version < 21 ? 2
 132                      : protocol_version < 30 ? MD4_DIGEST_LEN
 133                      : MD5_DIGEST_LEN;
 134 }
 135
 136 static int show_filelist_p(void)
 137 {
 138         return verbose && xfer_dirs && !am_server && !inc_recurse;
 139 }
 140
 141 static void start_filelist_progress(char *kind)
 142 {
 143         rprintf(FCLIENT, "%s ... ", kind);
 144         if (verbose > 1 || do_progress)
 145                 rprintf(FCLIENT, "\n");
 146         rflush(FINFO);
 147 }
 148
 149 static void emit_filelist_progress(int count)
 150 {
 151         rprintf(FCLIENT, " %d files...\r", count);
 152 }
 153
 154 static void maybe_emit_filelist_progress(int count)
 155 {
 156         if (do_progress && show_filelist_p() && (count % 100) == 0)
 157                 emit_filelist_progress(count);
 158 }
 159
 160 static void finish_filelist_progress(const struct file_list *flist)
 161 {
 162         if (do_progress) {
 163                 /* This overwrites the progress line */
 164                 rprintf(FINFO, "%d file%sto consider\n",
 165                         flist->used, flist->used == 1 ? " " : "s ");
 166         } else
 167                 rprintf(FINFO, "done\n");
 168 }
 169
 170 void show_flist_stats(void)
 171 {
 172         /* Nothing yet */
 173 }
 174
 175 static void list_file_entry(struct file_struct *f)
 176 {
 177         char permbuf[PERMSTRING_SIZE];
 178         double len;
 179
 180         if (!F_IS_ACTIVE(f)) {
 181                 /* this can happen if duplicate names were removed */
 182                 return;
 183         }
 184
 185         permstring(permbuf, f->mode);
 186         len = F_LENGTH(f);
 187
 188         /* TODO: indicate '+' if the entry has an ACL. */
 189
 190 #ifdef SUPPORT_LINKS
 191         if (preserve_links && S_ISLNK(f->mode)) {
 192                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 193                         permbuf, len, timestring(f->modtime),
 194                         f_name(f, NULL), F_SYMLINK(f));
 195         } else
 196 #endif
 197         {
 198                 rprintf(FINFO, "%s %11.0f %s %s\n",
 199                         permbuf, len, timestring(f->modtime),
 200                         f_name(f, NULL));
 201         }
 202 }
 203
 204 /* Stat either a symlink or its referent, depending on the settings of
 205  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 206  *
 207  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 208  * MAXPATHLEN chars) will be set to the symlink's target string.
 209  *
 210  * The stat structure pointed to by stp will contain information about the
 211  * link or the referent as appropriate, if they exist. */
 212 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 213 {
 214 #ifdef SUPPORT_LINKS
 215         if (link_stat(path, stp, copy_dirlinks) < 0)
 216                 return -1;
 217         if (S_ISLNK(stp->st_mode)) {
 218                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 219                 if (llen < 0)
 220                         return -1;
 221                 linkbuf[llen] = '\0';
 222                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 223                         if (verbose > 1) {
 224                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 225                                         path, linkbuf);
 226                         }
 227                         return x_stat(path, stp, NULL);
 228                 }
 229         }
 230         return 0;
 231 #else
 232         return x_stat(path, stp, NULL);
 233 #endif
 234 }
 235
 236 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 237 {
 238 #ifdef SUPPORT_LINKS
 239         if (copy_links)
 240                 return x_stat(path, stp, NULL);
 241         if (x_lstat(path, stp, NULL) < 0)
 242                 return -1;
 243         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 244                 STRUCT_STAT st;
 245                 if (x_stat(path, &st, NULL) == 0 && S_ISDIR(st.st_mode))
 246                         *stp = st;
 247         }
 248         return 0;
 249 #else
 250         return x_stat(path, stp, NULL);
 251 #endif
 252 }
 253
 254 /* This function is used to check if a file should be included/excluded
 255  * from the list of files based on its name and type etc.  The value of
 256  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 257 static int is_excluded(char *fname, int is_dir, int filter_level)
 258 {
 259 #if 0 /* This currently never happens, so avoid a useless compare. */
 260         if (filter_level == NO_FILTERS)
 261                 return 0;
 262 #endif
 263         if (fname) {
 264                 /* never exclude '.', even if somebody does --exclude '*' */
 265                 if (fname[0] == '.' && !fname[1])
 266                         return 0;
 267                 /* Handle the -R version of the '.' dir. */
 268                 if (fname[0] == '/') {
 269                         int len = strlen(fname);
 270                         if (fname[len-1] == '.' && fname[len-2] == '/')
 271                                 return 0;
 272                 }
 273         }
 274         if (server_filter_list.head
 275             && check_filter(&server_filter_list, fname, is_dir) < 0)
 276                 return 1;
 277         if (filter_level != ALL_FILTERS)
 278                 return 0;
 279         if (filter_list.head
 280             && check_filter(&filter_list, fname, is_dir) < 0)
 281                 return 1;
 282         return 0;
 283 }
 284
 285 static void send_directory(int f, struct file_list *flist,
 286                            char *fbuf, int len, int flags);
 287
 288 static const char *pathname, *orig_dir;
 289 static int pathname_len;
 290
 291
 292 /* Make sure flist can hold at least flist->used + extra entries. */
 293 static void flist_expand(struct file_list *flist, int extra)
 294 {
 295         struct file_struct **new_ptr;
 296
 297         if (flist->used + extra <= flist->malloced)
 298                 return;
 299
 300         if (flist->malloced < FLIST_START)
 301                 flist->malloced = FLIST_START;
 302         else if (flist->malloced >= FLIST_LINEAR)
 303                 flist->malloced += FLIST_LINEAR;
 304         else
 305                 flist->malloced *= 2;
 306
 307         /* In case count jumped or we are starting the list
 308          * with a known size just set it. */
 309         if (flist->malloced < flist->used + extra)
 310                 flist->malloced = flist->used + extra;
 311
 312         new_ptr = realloc_array(flist->files, struct file_struct *,
 313                                 flist->malloced);
 314
 315         if (verbose >= 2 && flist->malloced != FLIST_START) {
 316                 rprintf(FCLIENT, "[%s] expand file_list pointer array to %.0f bytes, did%s move\n",
 317                     who_am_i(),
 318                     (double)sizeof flist->files[0] * flist->malloced,
 319                     (new_ptr == flist->files) ? " not" : "");
 320         }
 321
 322         flist->files = new_ptr;
 323
 324         if (!flist->files)
 325                 out_of_memory("flist_expand");
 326 }
 327
 328 static void flist_done_allocating(struct file_list *flist)
 329 {
 330         void *ptr = pool_boundary(flist->file_pool, 8*1024);
 331         if (flist->pool_boundary == ptr)
 332                 flist->pool_boundary = NULL; /* list didn't use any pool memory */
 333         else
 334                 flist->pool_boundary = ptr;
 335 }
 336
 337 int push_pathname(const char *dir, int len)
 338 {
 339         if (dir == pathname)
 340                 return 1;
 341
 342         if (!orig_dir)
 343                 orig_dir = strdup(curr_dir);
 344
 345         if (pathname && !pop_dir(orig_dir)) {
 346                 rsyserr(FERROR, errno, "pop_dir %s failed",
 347                         full_fname(orig_dir));
 348                 exit_cleanup(RERR_FILESELECT);
 349         }
 350
 351         if (dir && !push_dir(dir, 0)) {
 352                 io_error |= IOERR_GENERAL;
 353                 rsyserr(FERROR, errno, "push_dir %s failed in %s",
 354                         full_fname(dir), curr_dir);
 355                 return 0;
 356         }
 357
 358         pathname = dir;
 359         pathname_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 360
 361         return 1;
 362 }
 363
 364 static void send_file_entry(int f, struct file_struct *file, int ndx, int first_ndx)
 365 {
 366         static time_t modtime;
 367         static mode_t mode;
 368         static int64 dev;
 369         static dev_t rdev;
 370         static uint32 rdev_major;
 371         static uid_t uid;
 372         static gid_t gid;
 373         static char *user_name, *group_name;
 374         static char lastname[MAXPATHLEN];
 375         char fname[MAXPATHLEN];
 376         int first_hlink_ndx = -1;
 377         int l1, l2;
 378         int xflags;
 379
 380 #ifdef ICONV_OPTION
 381         if (ic_send != (iconv_t)-1) {
 382                 xbuf outbuf, inbuf;
 383
 384                 INIT_CONST_XBUF(outbuf, fname);
 385
 386                 if (file->dirname) {
 387                         INIT_XBUF_STRLEN(inbuf, (char*)file->dirname);
 388                         outbuf.size -= 2; /* Reserve room for '/' & 1 more char. */
 389                         if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0)
 390                                 goto convert_error;
 391                         outbuf.size += 2;
 392                         outbuf.buf[outbuf.len++] = '/';
 393                 }
 394
 395                 INIT_XBUF_STRLEN(inbuf, (char*)file->basename);
 396                 if (iconvbufs(ic_send, &inbuf, &outbuf, 0) < 0) {
 397                   convert_error:
 398                         io_error |= IOERR_GENERAL;
 399                         rprintf(FINFO,
 400                             "[%s] cannot convert filename: %s (%s)\n",
 401                             who_am_i(), f_name(file, fname), strerror(errno));
 402                         return;
 403                 }
 404                 outbuf.buf[outbuf.len] = '\0';
 405         } else
 406 #endif
 407                 f_name(file, fname);
 408
 409         xflags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 410
 411         if (file->mode == mode)
 412                 xflags |= XMIT_SAME_MODE;
 413         else
 414                 mode = file->mode;
 415
 416         if (protocol_version >= 30 && S_ISDIR(mode) && !(file->flags & FLAG_XFER_DIR))
 417                 xflags |= XMIT_NON_XFER_DIR;
 418
 419         if ((preserve_devices && IS_DEVICE(mode))
 420          || (preserve_specials && IS_SPECIAL(mode))) {
 421                 if (protocol_version < 28) {
 422                         if (tmp_rdev == rdev)
 423                                 xflags |= XMIT_SAME_RDEV_pre28;
 424                         else
 425                                 rdev = tmp_rdev;
 426                 } else {
 427                         rdev = tmp_rdev;
 428                         if ((uint32)major(rdev) == rdev_major)
 429                                 xflags |= XMIT_SAME_RDEV_MAJOR;
 430                         else
 431                                 rdev_major = major(rdev);
 432                         if (protocol_version < 30 && (uint32)minor(rdev) <= 0xFFu)
 433                                 xflags |= XMIT_RDEV_MINOR_8_pre30;
 434                 }
 435         } else if (protocol_version < 28)
 436                 rdev = MAKEDEV(0, 0);
 437         if (uid_ndx) {
 438                 if ((uid_t)F_OWNER(file) == uid && *lastname)
 439                         xflags |= XMIT_SAME_UID;
 440                 else {
 441                         uid = F_OWNER(file);
 442                         if (uid_ndx && !numeric_ids) {
 443                                 user_name = add_uid(uid);
 444                                 if (inc_recurse && user_name)
 445                                         xflags |= XMIT_USER_NAME_FOLLOWS;
 446                         }
 447                 }
 448         }
 449         if (gid_ndx) {
 450                 if ((gid_t)F_GROUP(file) == gid && *lastname)
 451                         xflags |= XMIT_SAME_GID;
 452                 else {
 453                         gid = F_GROUP(file);
 454                         if (gid_ndx && !numeric_ids) {
 455                                 group_name = add_gid(gid);
 456                                 if (inc_recurse && group_name)
 457                                         xflags |= XMIT_GROUP_NAME_FOLLOWS;
 458                         }
 459                 }
 460         }
 461         if (file->modtime == modtime)
 462                 xflags |= XMIT_SAME_TIME;
 463         else
 464                 modtime = file->modtime;
 465
 466 #ifdef SUPPORT_HARD_LINKS
 467         if (tmp_dev != 0) {
 468                 if (protocol_version >= 30) {
 469                         struct ht_int64_node *np = idev_find(tmp_dev, tmp_ino);
 470                         first_hlink_ndx = (int32)(long)np->data - 1;
 471                         if (first_hlink_ndx < 0) {
 472                                 high_hlink_ndx = ndx + first_ndx;
 473                                 np->data = (void*)(long)(high_hlink_ndx + 1);
 474                                 xflags |= XMIT_HLINK_FIRST;
 475                         }
 476                         xflags |= XMIT_HLINKED;
 477                 } else {
 478                         if (tmp_dev == dev) {
 479                                 if (protocol_version >= 28)
 480                                         xflags |= XMIT_SAME_DEV_pre30;
 481                         } else
 482                                 dev = tmp_dev;
 483                         xflags |= XMIT_HLINKED;
 484                 }
 485         }
 486 #endif
 487
 488         for (l1 = 0;
 489             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 490             l1++) {}
 491         l2 = strlen(fname+l1);
 492
 493         if (l1 > 0)
 494                 xflags |= XMIT_SAME_NAME;
 495         if (l2 > 255)
 496                 xflags |= XMIT_LONG_NAME;
 497
 498         /* We must make sure we don't send a zero flag byte or the
 499          * other end will terminate the flist transfer.  Note that
 500          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 501          * it's harmless way to add a bit to the first flag byte. */
 502         if (protocol_version >= 28) {
 503                 if (!xflags && !S_ISDIR(mode))
 504                         xflags |= XMIT_TOP_DIR;
 505                 if ((xflags & 0xFF00) || !xflags) {
 506                         xflags |= XMIT_EXTENDED_FLAGS;
 507                         write_shortint(f, xflags);
 508                 } else
 509                         write_byte(f, xflags);
 510         } else {
 511                 if (!(xflags & 0xFF))
 512                         xflags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 513                 write_byte(f, xflags);
 514         }
 515         if (xflags & XMIT_SAME_NAME)
 516                 write_byte(f, l1);
 517         if (xflags & XMIT_LONG_NAME)
 518                 write_varint30(f, l2);
 519         else
 520                 write_byte(f, l2);
 521         write_buf(f, fname + l1, l2);
 522
 523         if (first_hlink_ndx >= 0) {
 524                 write_varint(f, first_hlink_ndx);
 525                 if (first_hlink_ndx >= first_ndx)
 526                         goto the_end;
 527         }
 528
 529         write_varlong30(f, F_LENGTH(file), 3);
 530         if (!(xflags & XMIT_SAME_TIME)) {
 531                 if (protocol_version >= 30)
 532                         write_varlong(f, modtime, 4);
 533                 else
 534                         write_int(f, modtime);
 535         }
 536         if (!(xflags & XMIT_SAME_MODE))
 537                 write_int(f, to_wire_mode(mode));
 538         if (uid_ndx && !(xflags & XMIT_SAME_UID)) {
 539                 if (protocol_version < 30)
 540                         write_int(f, uid);
 541                 else {
 542                         write_varint(f, uid);
 543                         if (xflags & XMIT_USER_NAME_FOLLOWS) {
 544                                 int len = strlen(user_name);
 545                                 write_byte(f, len);
 546                                 write_buf(f, user_name, len);
 547                         }
 548                 }
 549         }
 550         if (gid_ndx && !(xflags & XMIT_SAME_GID)) {
 551                 if (protocol_version < 30)
 552                         write_int(f, gid);
 553                 else {
 554                         write_varint(f, gid);
 555                         if (xflags & XMIT_GROUP_NAME_FOLLOWS) {
 556                                 int len = strlen(group_name);
 557                                 write_byte(f, len);
 558                                 write_buf(f, group_name, len);
 559                         }
 560                 }
 561         }
 562         if ((preserve_devices && IS_DEVICE(mode))
 563          || (preserve_specials && IS_SPECIAL(mode))) {
 564                 if (protocol_version < 28) {
 565                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 566                                 write_int(f, (int)rdev);
 567                 } else {
 568                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 569                                 write_varint30(f, major(rdev));
 570                         if (protocol_version >= 30)
 571                                 write_varint(f, minor(rdev));
 572                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 573                                 write_byte(f, minor(rdev));
 574                         else
 575                                 write_int(f, minor(rdev));
 576                 }
 577         }
 578
 579 #ifdef SUPPORT_LINKS
 580         if (preserve_links && S_ISLNK(mode)) {
 581                 const char *sl = F_SYMLINK(file);
 582                 int len = strlen(sl);
 583                 write_varint30(f, len);
 584                 write_buf(f, sl, len);
 585         }
 586 #endif
 587
 588 #ifdef SUPPORT_HARD_LINKS
 589         if (tmp_dev != 0 && protocol_version < 30) {
 590                 if (protocol_version < 26) {
 591                         /* 32-bit dev_t and ino_t */
 592                         write_int(f, (int32)dev);
 593                         write_int(f, (int32)tmp_ino);
 594                 } else {
 595                         /* 64-bit dev_t and ino_t */
 596                         if (!(xflags & XMIT_SAME_DEV_pre30))
 597                                 write_longint(f, dev);
 598                         write_longint(f, tmp_ino);
 599                 }
 600         }
 601 #endif
 602
 603         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 604                 const char *sum;
 605                 if (S_ISREG(mode))
 606                         sum = tmp_sum;
 607                 else {
 608                         /* Prior to 28, we sent a useless set of nulls. */
 609                         sum = empty_sum;
 610                 }
 611                 write_buf(f, sum, checksum_len);
 612         }
 613
 614   the_end:
 615         strlcpy(lastname, fname, MAXPATHLEN);
 616
 617         if (S_ISREG(mode) || S_ISLNK(mode))
 618                 stats.total_size += F_LENGTH(file);
 619 }
 620
 621 static struct file_struct *recv_file_entry(struct file_list *flist,
 622                                            int xflags, int f)
 623 {
 624         static int64 modtime;
 625         static mode_t mode;
 626         static int64 dev;
 627         static dev_t rdev;
 628         static uint32 rdev_major;
 629         static uid_t uid;
 630         static gid_t gid;
 631         static uint16 gid_flags;
 632         static char lastname[MAXPATHLEN], *lastdir;
 633         static int lastdir_depth, lastdir_len = -1;
 634         static unsigned int del_hier_name_len = 0;
 635         static int in_del_hier = 0;
 636         char thisname[MAXPATHLEN];
 637         unsigned int l1 = 0, l2 = 0;
 638         int alloc_len, basename_len, linkname_len;
 639         int extra_len = file_extra_cnt * EXTRA_LEN;
 640         int first_hlink_ndx = -1;
 641         OFF_T file_length;
 642         const char *basename;
 643         struct file_struct *file;
 644         alloc_pool_t *pool;
 645         char *bp;
 646
 647         if (xflags & XMIT_SAME_NAME)
 648                 l1 = read_byte(f);
 649
 650         if (xflags & XMIT_LONG_NAME)
 651                 l2 = read_varint30(f);
 652         else
 653                 l2 = read_byte(f);
 654
 655         if (l2 >= MAXPATHLEN - l1) {
 656                 rprintf(FERROR,
 657                         "overflow: xflags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 658                         xflags, l1, l2, lastname, who_am_i());
 659                 overflow_exit("recv_file_entry");
 660         }
 661
 662         strlcpy(thisname, lastname, l1 + 1);
 663         read_sbuf(f, &thisname[l1], l2);
 664         thisname[l1 + l2] = 0;
 665
 666         /* Abuse basename_len for a moment... */
 667         basename_len = strlcpy(lastname, thisname, MAXPATHLEN);
 668
 669 #ifdef ICONV_OPTION
 670         if (ic_recv != (iconv_t)-1) {
 671                 xbuf outbuf, inbuf;
 672
 673                 INIT_CONST_XBUF(outbuf, thisname);
 674                 INIT_XBUF(inbuf, lastname, basename_len, -1);
 675
 676                 if (iconvbufs(ic_recv, &inbuf, &outbuf, 0) < 0) {
 677                         io_error |= IOERR_GENERAL;
 678                         rprintf(FINFO,
 679                             "[%s] cannot convert filename: %s (%s)\n",
 680                             who_am_i(), lastname, strerror(errno));
 681                         outbuf.len = 0;
 682                 }
 683                 outbuf.buf[outbuf.len] = '\0';
 684         }
 685 #endif
 686
 687         clean_fname(thisname, 0);
 688
 689         if (sanitize_paths)
 690                 sanitize_path(thisname, thisname, "", 0, NULL);
 691
 692         if ((basename = strrchr(thisname, '/')) != NULL) {
 693                 int len = basename++ - thisname;
 694                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 695                         lastdir = new_array(char, len + 1);
 696                         memcpy(lastdir, thisname, len);
 697                         lastdir[len] = '\0';
 698                         lastdir_len = len;
 699                         lastdir_depth = count_dir_elements(lastdir);
 700                 }
 701         } else
 702                 basename = thisname;
 703         basename_len = strlen(basename) + 1; /* count the '\0' */
 704
 705 #ifdef SUPPORT_HARD_LINKS
 706         if (protocol_version >= 30
 707          && BITS_SETnUNSET(xflags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 708                 first_hlink_ndx = read_varint(f);
 709                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->ndx_start + flist->used) {
 710                         rprintf(FERROR,
 711                                 "hard-link reference out of range: %d (%d)\n",
 712                                 first_hlink_ndx, flist->ndx_start + flist->used);
 713                         exit_cleanup(RERR_PROTOCOL);
 714                 }
 715                 if (first_hlink_ndx >= flist->ndx_start) {
 716                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 717                         file_length = F_LENGTH(first);
 718                         modtime = first->modtime;
 719                         mode = first->mode;
 720                         if (uid_ndx)
 721                                 uid = F_OWNER(first);
 722                         if (gid_ndx)
 723                                 gid = F_GROUP(first);
 724                         if ((preserve_devices && IS_DEVICE(mode))
 725                          || (preserve_specials && IS_SPECIAL(mode))) {
 726                                 uint32 *devp = F_RDEV_P(first);
 727                                 rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 728                                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 729                         }
 730                         if (preserve_links && S_ISLNK(mode))
 731                                 linkname_len = strlen(F_SYMLINK(first)) + 1;
 732                         else
 733                                 linkname_len = 0;
 734                         goto create_object;
 735                 }
 736         }
 737 #endif
 738
 739         file_length = read_varlong30(f, 3);
 740         if (!(xflags & XMIT_SAME_TIME)) {
 741                 if (protocol_version >= 30) {
 742                         modtime = read_varlong(f, 4);
 743 #if SIZEOF_TIME_T < SIZEOF_INT64
 744                         if ((modtime > INT_MAX || modtime < INT_MIN) && !am_generator) {
 745                                 rprintf(FERROR,
 746                                     "Time value of %s truncated on receiver.\n",
 747                                     lastname);
 748                         }
 749 #endif
 750                 } else
 751                         modtime = read_int(f);
 752         }
 753         if (!(xflags & XMIT_SAME_MODE))
 754                 mode = from_wire_mode(read_int(f));
 755
 756         if (chmod_modes && !S_ISLNK(mode))
 757                 mode = tweak_mode(mode, chmod_modes);
 758
 759         if (uid_ndx && !(xflags & XMIT_SAME_UID)) {
 760                 if (protocol_version < 30)
 761                         uid = (uid_t)read_int(f);
 762                 else {
 763                         uid = (uid_t)read_varint(f);
 764                         if (xflags & XMIT_USER_NAME_FOLLOWS)
 765                                 uid = recv_user_name(f, uid);
 766                         else if (inc_recurse && am_root && !numeric_ids)
 767                                 uid = match_uid(uid);
 768                 }
 769         }
 770         if (gid_ndx && !(xflags & XMIT_SAME_GID)) {
 771                 if (protocol_version < 30)
 772                         gid = (gid_t)read_int(f);
 773                 else {
 774                         gid = (gid_t)read_varint(f);
 775                         gid_flags = 0;
 776                         if (xflags & XMIT_GROUP_NAME_FOLLOWS)
 777                                 gid = recv_group_name(f, gid, &gid_flags);
 778                         else if (inc_recurse && (!am_root || !numeric_ids))
 779                                 gid = match_gid(gid, &gid_flags);
 780                 }
 781         }
 782
 783         if ((preserve_devices && IS_DEVICE(mode))
 784          || (preserve_specials && IS_SPECIAL(mode))) {
 785                 if (protocol_version < 28) {
 786                         if (!(xflags & XMIT_SAME_RDEV_pre28))
 787                                 rdev = (dev_t)read_int(f);
 788                 } else {
 789                         uint32 rdev_minor;
 790                         if (!(xflags & XMIT_SAME_RDEV_MAJOR))
 791                                 rdev_major = read_varint30(f);
 792                         if (protocol_version >= 30)
 793                                 rdev_minor = read_varint(f);
 794                         else if (xflags & XMIT_RDEV_MINOR_8_pre30)
 795                                 rdev_minor = read_byte(f);
 796                         else
 797                                 rdev_minor = read_int(f);
 798                         rdev = MAKEDEV(rdev_major, rdev_minor);
 799                 }
 800                 extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 801                 file_length = 0;
 802         } else if (protocol_version < 28)
 803                 rdev = MAKEDEV(0, 0);
 804
 805 #ifdef SUPPORT_LINKS
 806         if (preserve_links && S_ISLNK(mode)) {
 807                 linkname_len = read_varint30(f) + 1; /* count the '\0' */
 808                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 809                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 810                                 linkname_len - 1);
 811                         overflow_exit("recv_file_entry");
 812                 }
 813         }
 814         else
 815 #endif
 816                 linkname_len = 0;
 817
 818 #ifdef SUPPORT_HARD_LINKS
 819   create_object:
 820         if (preserve_hard_links) {
 821                 if (protocol_version < 28 && S_ISREG(mode))
 822                         xflags |= XMIT_HLINKED;
 823                 if (xflags & XMIT_HLINKED)
 824                         extra_len += (inc_recurse+1) * EXTRA_LEN;
 825         }
 826 #endif
 827
 828 #ifdef SUPPORT_ACLS
 829         /* We need one or two index int32s when we're preserving ACLs. */
 830         if (preserve_acls)
 831                 extra_len += (S_ISDIR(mode) ? 2 : 1) * EXTRA_LEN;
 832 #endif
 833
 834         if (always_checksum && S_ISREG(mode))
 835                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 836
 837         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 838                 extra_len += EXTRA_LEN;
 839
 840 #if EXTRA_ROUNDING > 0
 841         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 842                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 843 #endif
 844
 845         if (inc_recurse && S_ISDIR(mode)) {
 846                 if (one_file_system) {
 847                         /* Room to save the dir's device for -x */
 848                         extra_len += DEV_EXTRA_CNT * EXTRA_LEN;
 849                 }
 850                 pool = dir_flist->file_pool;
 851         } else
 852                 pool = flist->file_pool;
 853
 854         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 855                   + linkname_len;
 856         bp = pool_alloc(pool, alloc_len, "recv_file_entry");
 857
 858         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 859         bp += extra_len;
 860         file = (struct file_struct *)bp;
 861         bp += FILE_STRUCT_LEN;
 862
 863         memcpy(bp, basename, basename_len);
 864         bp += basename_len + linkname_len; /* skip space for symlink too */
 865
 866 #ifdef SUPPORT_HARD_LINKS
 867         if (xflags & XMIT_HLINKED)
 868                 file->flags |= FLAG_HLINKED;
 869 #endif
 870         file->modtime = (time_t)modtime;
 871         file->len32 = (uint32)file_length;
 872         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 873                 file->flags |= FLAG_LENGTH64;
 874                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 875         }
 876         file->mode = mode;
 877         if (uid_ndx)
 878                 F_OWNER(file) = uid;
 879         if (gid_ndx) {
 880                 F_GROUP(file) = gid;
 881                 file->flags |= gid_flags;
 882         }
 883 #ifdef ICONV_OPTION
 884         if (ic_ndx)
 885                 F_NDX(file) = flist->used + flist->ndx_start;
 886 #endif
 887
 888         if (basename != thisname) {
 889                 file->dirname = lastdir;
 890                 F_DEPTH(file) = lastdir_depth + 1;
 891         } else
 892                 F_DEPTH(file) = 1;
 893
 894         if (S_ISDIR(mode)) {
 895                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 896                         F_DEPTH(file)--;
 897                 if (xflags & XMIT_TOP_DIR) {
 898                         in_del_hier = recurse;
 899                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 900                         if (relative_paths && del_hier_name_len > 2
 901                             && lastname[del_hier_name_len-1] == '.'
 902                             && lastname[del_hier_name_len-2] == '/')
 903                                 del_hier_name_len -= 2;
 904                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 905                 } else if (protocol_version >= 30) {
 906                         if (!(xflags & XMIT_NON_XFER_DIR))
 907                                 file->flags |= FLAG_XFER_DIR;
 908                 } else if (in_del_hier) {
 909                         if (!relative_paths || !del_hier_name_len
 910                          || (l1 >= del_hier_name_len
 911                           && lastname[del_hier_name_len] == '/'))
 912                                 file->flags |= FLAG_XFER_DIR;
 913                         else
 914                                 in_del_hier = 0;
 915                 }
 916         }
 917
 918         if ((preserve_devices && IS_DEVICE(mode))
 919          || (preserve_specials && IS_SPECIAL(mode))) {
 920                 uint32 *devp = F_RDEV_P(file);
 921                 DEV_MAJOR(devp) = major(rdev);
 922                 DEV_MINOR(devp) = minor(rdev);
 923         }
 924
 925 #ifdef SUPPORT_LINKS
 926         if (linkname_len) {
 927                 bp = (char*)file->basename + basename_len;
 928                 if (first_hlink_ndx >= flist->ndx_start) {
 929                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 930                         memcpy(bp, F_SYMLINK(first), linkname_len);
 931                 } else
 932                         read_sbuf(f, bp, linkname_len - 1);
 933                 if (sanitize_paths)
 934                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 935         }
 936 #endif
 937
 938 #ifdef SUPPORT_HARD_LINKS
 939         if (preserve_hard_links && xflags & XMIT_HLINKED) {
 940                 if (protocol_version >= 30) {
 941                         if (xflags & XMIT_HLINK_FIRST) {
 942                                 high_hlink_ndx = flist->ndx_start + flist->used;
 943                                 F_HL_GNUM(file) = high_hlink_ndx;
 944                         } else
 945                                 F_HL_GNUM(file) = first_hlink_ndx;
 946                 } else {
 947                         static int32 cnt = 0;
 948                         struct ht_int64_node *np;
 949                         int64 ino;
 950                         int32 ndx;
 951                         if (protocol_version < 26) {
 952                                 dev = read_int(f);
 953                                 ino = read_int(f);
 954                         } else {
 955                                 if (!(xflags & XMIT_SAME_DEV_pre30))
 956                                         dev = read_longint(f);
 957                                 ino = read_longint(f);
 958                         }
 959                         np = idev_find(dev, ino);
 960                         ndx = (int32)(long)np->data - 1;
 961                         if (ndx < 0) {
 962                                 ndx = cnt++;
 963                                 np->data = (void*)(long)cnt;
 964                         }
 965                         F_HL_GNUM(file) = ndx;
 966                 }
 967         }
 968 #endif
 969
 970         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 971                 if (S_ISREG(mode))
 972                         bp = F_SUM(file);
 973                 else {
 974                         /* Prior to 28, we get a useless set of nulls. */
 975                         bp = tmp_sum;
 976                 }
 977                 if (first_hlink_ndx >= flist->ndx_start) {
 978                         struct file_struct *first = flist->files[first_hlink_ndx - flist->ndx_start];
 979                         memcpy(bp, F_SUM(first), checksum_len);
 980                 } else
 981                         read_buf(f, bp, checksum_len);
 982         }
 983
 984 #ifdef SUPPORT_ACLS
 985         if (preserve_acls && !S_ISLNK(mode))
 986                 receive_acl(file, f);
 987 #endif
 988 #ifdef SUPPORT_XATTRS
 989         if (preserve_xattrs)
 990                 receive_xattr(file, f );
 991 #endif
 992
 993         if (S_ISREG(mode) || S_ISLNK(mode))
 994                 stats.total_size += file_length;
 995
 996         return file;
 997 }
 998
 999 /* Create a file_struct for a named file by reading its stat() information
1000  * and performing extensive checks against global options.
1001  *
1002  * Returns a pointer to the new file struct, or NULL if there was an error
1003  * or this file should be excluded. */
1004 struct file_struct *make_file(const char *fname, struct file_list *flist,
1005                               STRUCT_STAT *stp, int flags, int filter_level)
1006 {
1007         static char *lastdir;
1008         static int lastdir_len = -1;
1009         struct file_struct *file;
1010         char thisname[MAXPATHLEN];
1011         char linkname[MAXPATHLEN];
1012         int alloc_len, basename_len, linkname_len;
1013         int extra_len = file_extra_cnt * EXTRA_LEN;
1014         const char *basename;
1015         alloc_pool_t *pool;
1016         STRUCT_STAT st;
1017         char *bp;
1018
1019         if (strlcpy(thisname, fname, sizeof thisname) >= sizeof thisname) {
1020                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
1021                 return NULL;
1022         }
1023         clean_fname(thisname, 0);
1024         if (sanitize_paths)
1025                 sanitize_path(thisname, thisname, "", 0, NULL);
1026
1027         if (stp && S_ISDIR(stp->st_mode)) {
1028                 st = *stp; /* Needed for "symlink/." with --relative. */
1029                 *linkname = '\0'; /* make IBM code checker happy */
1030         } else if (readlink_stat(thisname, &st, linkname) != 0) {
1031                 int save_errno = errno;
1032                 /* See if file is excluded before reporting an error. */
1033                 if (filter_level != NO_FILTERS
1034                  && (is_excluded(thisname, 0, filter_level)
1035                   || is_excluded(thisname, 1, filter_level))) {
1036                         if (ignore_perishable && save_errno != ENOENT)
1037                                 non_perishable_cnt++;
1038                         return NULL;
1039                 }
1040                 if (save_errno == ENOENT) {
1041 #ifdef SUPPORT_LINKS
1042                         /* Avoid "vanished" error if symlink points nowhere. */
1043                         if (copy_links && x_lstat(thisname, &st, NULL) == 0
1044                             && S_ISLNK(st.st_mode)) {
1045                                 io_error |= IOERR_GENERAL;
1046                                 rprintf(FERROR, "symlink has no referent: %s\n",
1047                                         full_fname(thisname));
1048                         } else
1049 #endif
1050                         {
1051                                 enum logcode c = am_daemon && protocol_version < 28
1052                                     ? FERROR : FINFO;
1053                                 io_error |= IOERR_VANISHED;
1054                                 rprintf(c, "file has vanished: %s\n",
1055                                         full_fname(thisname));
1056                         }
1057                 } else {
1058                         io_error |= IOERR_GENERAL;
1059                         rsyserr(FERROR, save_errno, "readlink %s failed",
1060                                 full_fname(thisname));
1061                 }
1062                 return NULL;
1063         }
1064
1065         /* backup.c calls us with filter_level set to NO_FILTERS. */
1066         if (filter_level == NO_FILTERS)
1067                 goto skip_filters;
1068
1069         if (S_ISDIR(st.st_mode)) {
1070                 if (!xfer_dirs) {
1071                         rprintf(FINFO, "skipping directory %s\n", thisname);
1072                         return NULL;
1073                 }
1074         } else
1075                 flags &= ~FLAG_XFER_DIR;
1076
1077         /* -x only affects directories because we need to avoid recursing
1078          * into a mount-point directory, not to avoid copying a symlinked
1079          * file if -L (or similar) was specified. */
1080         if (one_file_system && st.st_dev != filesystem_dev
1081          && S_ISDIR(st.st_mode)) {
1082                 if (one_file_system > 1) {
1083                         if (verbose > 2) {
1084                                 rprintf(FINFO, "skipping mount-point dir %s\n",
1085                                         thisname);
1086                         }
1087                         return NULL;
1088                 }
1089                 flags |= FLAG_MOUNT_DIR;
1090         }
1091
1092         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
1093                 if (ignore_perishable)
1094                         non_perishable_cnt++;
1095                 return NULL;
1096         }
1097
1098         if (lp_ignore_nonreadable(module_id)) {
1099 #ifdef SUPPORT_LINKS
1100                 if (!S_ISLNK(st.st_mode))
1101 #endif
1102                         if (access(thisname, R_OK) != 0)
1103                                 return NULL;
1104         }
1105
1106   skip_filters:
1107
1108         /* Only divert a directory in the main transfer. */
1109         if (flist) {
1110                 if (flist->prev && S_ISDIR(st.st_mode)
1111                  && flags & FLAG_DIVERT_DIRS) {
1112                         /* Room for parent/sibling/next-child info. */
1113                         extra_len += DIRNODE_EXTRA_CNT * EXTRA_LEN;
1114                         dir_count++;
1115                         pool = dir_flist->file_pool;
1116                 } else
1117                         pool = flist->file_pool;
1118         } else
1119                 pool = NULL;
1120
1121         if (verbose > 2) {
1122                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1123                         who_am_i(), thisname, filter_level);
1124         }
1125
1126         if ((basename = strrchr(thisname, '/')) != NULL) {
1127                 int len = basename++ - thisname;
1128                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1129                         lastdir = new_array(char, len + 1);
1130                         memcpy(lastdir, thisname, len);
1131                         lastdir[len] = '\0';
1132                         lastdir_len = len;
1133                 }
1134         } else
1135                 basename = thisname;
1136         basename_len = strlen(basename) + 1; /* count the '\0' */
1137
1138 #ifdef SUPPORT_LINKS
1139         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1140 #else
1141         linkname_len = 0;
1142 #endif
1143
1144         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1145                 extra_len += EXTRA_LEN;
1146
1147 #if EXTRA_ROUNDING > 0
1148         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1149                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1150 #endif
1151
1152         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1153                   + linkname_len;
1154         if (pool)
1155                 bp = pool_alloc(pool, alloc_len, "make_file");
1156         else {
1157                 if (!(bp = new_array(char, alloc_len)))
1158                         out_of_memory("make_file");
1159         }
1160
1161         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1162         bp += extra_len;
1163         file = (struct file_struct *)bp;
1164         bp += FILE_STRUCT_LEN;
1165
1166         memcpy(bp, basename, basename_len);
1167         bp += basename_len + linkname_len; /* skip space for symlink too */
1168
1169 #ifdef SUPPORT_HARD_LINKS
1170         if (preserve_hard_links && flist && flist->prev) {
1171                 if (protocol_version >= 28
1172                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1173                  : S_ISREG(st.st_mode)) {
1174                         tmp_dev = st.st_dev;
1175                         tmp_ino = st.st_ino;
1176                 } else
1177                         tmp_dev = 0;
1178         }
1179 #endif
1180
1181 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1182         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1183                 tmp_rdev = st.st_rdev;
1184                 st.st_size = 0;
1185         }
1186 #endif
1187
1188         file->flags = flags;
1189         file->modtime = st.st_mtime;
1190         file->len32 = (uint32)st.st_size;
1191         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1192                 file->flags |= FLAG_LENGTH64;
1193                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1194         }
1195         file->mode = st.st_mode;
1196         if (uid_ndx)
1197                 F_OWNER(file) = st.st_uid;
1198         if (gid_ndx)
1199                 F_GROUP(file) = st.st_gid;
1200
1201         if (basename != thisname)
1202                 file->dirname = lastdir;
1203
1204 #ifdef SUPPORT_LINKS
1205         if (linkname_len) {
1206                 bp = (char*)file->basename + basename_len;
1207                 memcpy(bp, linkname, linkname_len);
1208         }
1209 #endif
1210
1211         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1212                 file_checksum(thisname, tmp_sum, st.st_size);
1213
1214         F_PATHNAME(file) = pathname;
1215
1216         /* This code is only used by the receiver when it is building
1217          * a list of files for a delete pass. */
1218         if (keep_dirlinks && linkname_len && flist) {
1219                 STRUCT_STAT st2;
1220                 int save_mode = file->mode;
1221                 file->mode = S_IFDIR; /* Find a directory with our name. */
1222                 if (flist_find(dir_flist, file) >= 0
1223                  && x_stat(thisname, &st2, NULL) == 0 && S_ISDIR(st2.st_mode)) {
1224                         file->modtime = st2.st_mtime;
1225                         file->len32 = 0;
1226                         file->mode = st2.st_mode;
1227                         if (uid_ndx)
1228                                 F_OWNER(file) = st2.st_uid;
1229                         if (gid_ndx)
1230                                 F_GROUP(file) = st2.st_gid;
1231                 } else
1232                         file->mode = save_mode;
1233         }
1234
1235         if (basename_len == 0+1)
1236                 return NULL;
1237
1238 #ifdef ICONV_OPTION
1239         if (ic_ndx)
1240                 F_NDX(file) = dir_count - 1;
1241 #endif
1242
1243         return file;
1244 }
1245
1246 /* Only called for temporary file_struct entries created by make_file(). */
1247 void unmake_file(struct file_struct *file)
1248 {
1249         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1250 #if EXTRA_ROUNDING > 0
1251         if (extra_cnt & EXTRA_ROUNDING)
1252                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1253 #endif
1254         free(REQ_EXTRA(file, extra_cnt));
1255 }
1256
1257 static struct file_struct *send_file_name(int f, struct file_list *flist,
1258                                           char *fname, STRUCT_STAT *stp,
1259                                           int flags, int filter_level)
1260 {
1261         struct file_struct *file;
1262 #if defined SUPPORT_ACLS || defined SUPPORT_XATTRS
1263         statx sx;
1264 #endif
1265
1266         file = make_file(fname, flist, stp, flags, filter_level);
1267         if (!file)
1268                 return NULL;
1269
1270         if (chmod_modes && !S_ISLNK(file->mode))
1271                 file->mode = tweak_mode(file->mode, chmod_modes);
1272
1273 #ifdef SUPPORT_ACLS
1274         if (preserve_acls && !S_ISLNK(file->mode) && f >= 0) {
1275                 sx.st.st_mode = file->mode;
1276                 sx.acc_acl = sx.def_acl = NULL;
1277                 if (get_acl(fname, &sx) < 0)
1278                         return NULL;
1279         }
1280 #endif
1281 #ifdef SUPPORT_XATTRS
1282         if (preserve_xattrs && f >= 0) {
1283                 sx.xattr = NULL;
1284                 if (get_xattr(fname, &sx) < 0)
1285                         return NULL;
1286         }
1287 #endif
1288
1289         maybe_emit_filelist_progress(flist->used + flist_count_offset);
1290
1291         flist_expand(flist, 1);
1292         flist->files[flist->used++] = file;
1293         if (f >= 0) {
1294                 send_file_entry(f, file, flist->used - 1, flist->ndx_start);
1295 #ifdef SUPPORT_ACLS
1296                 if (preserve_acls && !S_ISLNK(file->mode)) {
1297                         send_acl(&sx, f);
1298                         free_acl(&sx);
1299                 }
1300 #endif
1301 #ifdef SUPPORT_XATTRS
1302                 if (preserve_xattrs) {
1303                         F_XATTR(file) = send_xattr(&sx, f);
1304                         free_xattr(&sx);
1305                 }
1306 #endif
1307         }
1308         return file;
1309 }
1310
1311 static void send_if_directory(int f, struct file_list *flist,
1312                               struct file_struct *file,
1313                               char *fbuf, unsigned int ol,
1314                               int flags)
1315 {
1316         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1317
1318         if (S_ISDIR(file->mode)
1319             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1320                 void *save_filters;
1321                 unsigned int len = strlen(fbuf);
1322                 if (len > 1 && fbuf[len-1] == '/')
1323                         fbuf[--len] = '\0';
1324                 if (len >= MAXPATHLEN - 1) {
1325                         io_error |= IOERR_GENERAL;
1326                         rprintf(FERROR, "skipping long-named directory: %s\n",
1327                                 full_fname(fbuf));
1328                         return;
1329                 }
1330                 save_filters = push_local_filters(fbuf, len);
1331                 send_directory(f, flist, fbuf, len, flags);
1332                 pop_local_filters(save_filters);
1333                 fbuf[ol] = '\0';
1334                 if (is_dot_dir)
1335                         fbuf[ol-1] = '.';
1336         }
1337 }
1338
1339 static int file_compare(const void *file1, const void *file2)
1340 {
1341         return f_name_cmp(*(struct file_struct **)file1,
1342                           *(struct file_struct **)file2);
1343 }
1344
1345 /* The guts of a merge-sort algorithm.  This was derived from the glibc
1346  * version, but I (Wayne) changed the merge code to do less copying and
1347  * to require only half the amount of temporary memory. */
1348 static void fsort_tmp(struct file_struct **fp, size_t num,
1349                       struct file_struct **tmp)
1350 {
1351         struct file_struct **f1, **f2, **t;
1352         size_t n1, n2;
1353
1354         n1 = num / 2;
1355         n2 = num - n1;
1356         f1 = fp;
1357         f2 = fp + n1;
1358
1359         if (n1 > 1)
1360                 fsort_tmp(f1, n1, tmp);
1361         if (n2 > 1)
1362                 fsort_tmp(f2, n2, tmp);
1363
1364         while (f_name_cmp(*f1, *f2) <= 0) {
1365                 if (!--n1)
1366                         return;
1367                 f1++;
1368         }
1369
1370         t = tmp;
1371         memcpy(t, f1, n1 * PTR_SIZE);
1372
1373         *f1++ = *f2++, n2--;
1374
1375         while (n1 > 0 && n2 > 0) {
1376                 if (f_name_cmp(*t, *f2) <= 0)
1377                         *f1++ = *t++, n1--;
1378                 else
1379                         *f1++ = *f2++, n2--;
1380         }
1381
1382         if (n1 > 0)
1383                 memcpy(f1, t, n1 * PTR_SIZE);
1384 }
1385
1386 /* This file-struct sorting routine makes sure that any identical names in
1387  * the file list stay in the same order as they were in the original list.
1388  * This is particularly vital in inc_recurse mode where we expect a sort
1389  * on the flist to match the exact order of a sort on the dir_flist. */
1390 static void fsort(struct file_struct **fp, size_t num)
1391 {
1392         if (num <= 1)
1393                 return;
1394
1395         if (use_qsort)
1396                 qsort(fp, num, PTR_SIZE, file_compare);
1397         else {
1398                 struct file_struct **tmp = new_array(struct file_struct *,
1399                                                      (num+1) / 2);
1400                 fsort_tmp(fp, num, tmp);
1401                 free(tmp);
1402         }
1403 }
1404
1405 /* We take an entire set of sibling dirs from the sorted flist and link them
1406  * into the tree, setting the appropriate parent/child/sibling pointers. */
1407 static void add_dirs_to_tree(int parent_ndx, struct file_list *from_flist,
1408                              int dir_cnt)
1409 {
1410         int i;
1411         int32 *dp = NULL;
1412         int32 *parent_dp = parent_ndx < 0 ? NULL
1413                          : F_DIR_NODE_P(dir_flist->sorted[parent_ndx]);
1414
1415         flist_expand(dir_flist, dir_cnt);
1416         dir_flist->sorted = dir_flist->files;
1417
1418         for (i = 0; dir_cnt; i++) {
1419                 struct file_struct *file = from_flist->sorted[i];
1420
1421                 if (!S_ISDIR(file->mode))
1422                         continue;
1423
1424                 dir_flist->files[dir_flist->used++] = file;
1425                 dir_cnt--;
1426
1427                 if (!(file->flags & FLAG_XFER_DIR)
1428                  || file->flags & FLAG_MOUNT_DIR)
1429                         continue;
1430
1431                 if (dp)
1432                         DIR_NEXT_SIBLING(dp) = dir_flist->used - 1;
1433                 else if (parent_dp)
1434                         DIR_FIRST_CHILD(parent_dp) = dir_flist->used - 1;
1435                 else
1436                         send_dir_ndx = dir_flist->used - 1;
1437
1438                 dp = F_DIR_NODE_P(file);
1439                 DIR_PARENT(dp) = parent_ndx;
1440                 DIR_FIRST_CHILD(dp) = -1;
1441         }
1442         if (dp)
1443                 DIR_NEXT_SIBLING(dp) = -1;
1444 }
1445
1446 /* This function is normally called by the sender, but the receiving side also
1447  * calls it from get_dirlist() with f set to -1 so that we just construct the
1448  * file list in memory without sending it over the wire.  Also, get_dirlist()
1449  * might call this with f set to -2, which also indicates that local filter
1450  * rules should be ignored. */
1451 static void send_directory(int f, struct file_list *flist, char *fbuf, int len,
1452                            int flags)
1453 {
1454         struct dirent *di;
1455         unsigned remainder;
1456         char *p;
1457         DIR *d;
1458         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1459         int start = flist->used;
1460         int filter_level = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1461
1462         assert(flist != NULL);
1463
1464         if (!(d = opendir(fbuf))) {
1465                 io_error |= IOERR_GENERAL;
1466                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1467                 return;
1468         }
1469
1470         p = fbuf + len;
1471         if (len != 1 || *fbuf != '/')
1472                 *p++ = '/';
1473         *p = '\0';
1474         remainder = MAXPATHLEN - (p - fbuf);
1475
1476         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1477                 char *dname = d_name(di);
1478                 if (dname[0] == '.' && (dname[1] == '\0'
1479                     || (dname[1] == '.' && dname[2] == '\0')))
1480                         continue;
1481                 if (strlcpy(p, dname, remainder) >= remainder) {
1482                         io_error |= IOERR_GENERAL;
1483                         rprintf(FINFO,
1484                                 "cannot send long-named file %s\n",
1485                                 full_fname(fbuf));
1486                         continue;
1487                 }
1488                 if (dname[0] == '\0') {
1489                         io_error |= IOERR_GENERAL;
1490                         rprintf(FINFO,
1491                                 "cannot send file with empty name in %s\n",
1492                                 full_fname(fbuf));
1493                         continue;
1494                 }
1495
1496                 send_file_name(f, flist, fbuf, NULL, flags, filter_level);
1497         }
1498
1499         fbuf[len] = '\0';
1500
1501         if (errno) {
1502                 io_error |= IOERR_GENERAL;
1503                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1504         }
1505
1506         closedir(d);
1507
1508         if (f >= 0 && recurse && !divert_dirs) {
1509                 int i, end = flist->used - 1;
1510                 /* send_if_directory() bumps flist->used, so use "end". */
1511                 for (i = start; i <= end; i++)
1512                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1513         }
1514 }
1515
1516 static void send1extra(int f, struct file_struct *file, struct file_list *flist)
1517 {
1518         char fbuf[MAXPATHLEN];
1519         int dlen;
1520
1521         f_name(file, fbuf);
1522         dlen = strlen(fbuf);
1523
1524         if (F_PATHNAME(file) != pathname) {
1525                 if (!push_pathname(F_PATHNAME(file), -1))
1526                         exit_cleanup(RERR_FILESELECT);
1527         }
1528
1529         change_local_filter_dir(fbuf, dlen, send_dir_depth);
1530
1531         send_directory(f, flist, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1532 }
1533
1534 void send_extra_file_list(int f, int at_least)
1535 {
1536         struct file_list *flist;
1537         int64 start_write;
1538         int future_cnt, save_io_error = io_error;
1539
1540         if (flist_eof)
1541                 return;
1542
1543         /* Keep sending data until we have the requested number of
1544          * files in the upcoming file-lists. */
1545         if (cur_flist->next) {
1546                 flist = first_flist->prev; /* the newest flist */
1547                 future_cnt = flist->ndx_end - cur_flist->next->ndx_start + 1;
1548         } else
1549                 future_cnt = 0;
1550         while (future_cnt < at_least) {
1551                 struct file_struct *file = dir_flist->sorted[send_dir_ndx];
1552                 int dir_ndx, dstart = dir_count;
1553                 const char *pathname = F_PATHNAME(file);
1554                 int32 *dp;
1555
1556                 flist = flist_new(0, "send_extra_file_list");
1557                 start_write = stats.total_written;
1558
1559 #ifdef ICONV_OPTION
1560                 if (ic_ndx)
1561                         dir_ndx = F_NDX(file);
1562                 else
1563 #endif
1564                         dir_ndx = send_dir_ndx;
1565                 write_ndx(f, NDX_FLIST_OFFSET - dir_ndx);
1566                 flist->parent_ndx = dir_ndx;
1567
1568                 send1extra(f, file, flist);
1569                 dp = F_DIR_NODE_P(file);
1570
1571                 /* If there are any duplicate directory names that follow, we
1572                  * send all the dirs together in one file-list.  The dir_flist
1573                  * tree links all the child subdirs onto the last dup dir. */
1574                 while ((dir_ndx = DIR_NEXT_SIBLING(dp)) >= 0
1575                     && dir_flist->sorted[dir_ndx]->flags & FLAG_DUPLICATE) {
1576                         send_dir_ndx = dir_ndx;
1577                         file = dir_flist->sorted[dir_ndx];
1578                         if (F_PATHNAME(file) != pathname)
1579                                 send1extra(f, file, flist);
1580                         dp = F_DIR_NODE_P(file);
1581                 }
1582
1583                 write_byte(f, 0);
1584
1585 #ifdef ICONV_OPTION
1586                 if (need_unsorted_flist) {
1587                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
1588                                 out_of_memory("send_extra_file_list");
1589                         memcpy(flist->sorted, flist->files,
1590                                flist->used * sizeof (struct file_struct*));
1591                 } else
1592 #endif
1593                         flist->sorted = flist->files;
1594
1595                 clean_flist(flist, 0);
1596
1597                 flist->ndx_end = flist->ndx_start + flist->used - 1
1598                                - (dir_count - dstart);
1599
1600                 add_dirs_to_tree(send_dir_ndx, flist, dir_count - dstart);
1601                 flist_done_allocating(flist);
1602
1603                 file_total += flist->used;
1604                 future_cnt += flist->used;
1605                 stats.flist_size += stats.total_written - start_write;
1606                 stats.num_files += flist->used;
1607                 if (verbose > 3)
1608                         output_flist(flist);
1609
1610                 if (DIR_FIRST_CHILD(dp) >= 0) {
1611                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1612                         send_dir_depth++;
1613                 } else {
1614                         while (DIR_NEXT_SIBLING(dp) < 0) {
1615                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1616                                         write_ndx(f, NDX_FLIST_EOF);
1617                                         flist_eof = 1;
1618                                         change_local_filter_dir(NULL, 0, 0);
1619                                         goto finish;
1620                                 }
1621                                 send_dir_depth--;
1622                                 file = dir_flist->sorted[send_dir_ndx];
1623                                 dp = F_DIR_NODE_P(file);
1624                         }
1625                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1626                 }
1627         }
1628
1629   finish:
1630         if (io_error != save_io_error && !ignore_errors)
1631                 send_msg_int(MSG_IO_ERROR, io_error);
1632 }
1633
1634 struct file_list *send_file_list(int f, int argc, char *argv[])
1635 {
1636         static const char *lastdir;
1637         static int lastdir_len = -1;
1638         int len, dirlen;
1639         STRUCT_STAT st;
1640         char *p, *dir;
1641         char lastpath[MAXPATHLEN] = "";
1642         struct file_list *flist;
1643         struct timeval start_tv, end_tv;
1644         int64 start_write;
1645         int use_ff_fd = 0;
1646         int flags, disable_buffering;
1647         int reading_remotely = filesfrom_host != NULL;
1648         int rl_flags = (reading_remotely ? 0 : RL_DUMP_COMMENTS)
1649 #ifdef ICONV_OPTION
1650                      | (filesfrom_convert ? RL_CONVERT : 0)
1651 #endif
1652                      | (eol_nulls || reading_remotely ? RL_EOL_NULLS : 0);
1653
1654         rprintf(FLOG, "building file list\n");
1655         if (show_filelist_p())
1656                 start_filelist_progress("building file list");
1657         else if (inc_recurse && verbose && !am_server)
1658                 rprintf(FCLIENT, "sending incremental file list\n");
1659
1660         start_write = stats.total_written;
1661         gettimeofday(&start_tv, NULL);
1662
1663 #ifdef SUPPORT_HARD_LINKS
1664         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1665                 init_hard_links();
1666 #endif
1667
1668         flist = cur_flist = flist_new(0, "send_file_list");
1669         if (inc_recurse) {
1670                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1671                 flags = FLAG_DIVERT_DIRS | FLAG_XFER_DIR;
1672         } else {
1673                 dir_flist = cur_flist;
1674                 flags = FLAG_XFER_DIR;
1675         }
1676
1677         disable_buffering = io_start_buffering_out(f);
1678         if (filesfrom_fd >= 0) {
1679                 if (argv[0] && !push_dir(argv[0], 0)) {
1680                         rsyserr(FERROR, errno, "push_dir %s failed in %s",
1681                                 full_fname(argv[0]), curr_dir);
1682                         exit_cleanup(RERR_FILESELECT);
1683                 }
1684                 use_ff_fd = 1;
1685         }
1686
1687         while (1) {
1688                 char fbuf[MAXPATHLEN];
1689                 char *fn;
1690                 int is_dot_dir;
1691
1692                 if (use_ff_fd) {
1693                         if (read_line(filesfrom_fd, fbuf, sizeof fbuf, rl_flags) == 0)
1694                                 break;
1695                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1696                 } else {
1697                         if (argc-- == 0)
1698                                 break;
1699                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1700                         if (sanitize_paths)
1701                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1702                 }
1703
1704                 len = strlen(fbuf);
1705                 if (relative_paths) {
1706                         /* We clean up fbuf below. */
1707                         is_dot_dir = 0;
1708                 } else if (!len || fbuf[len - 1] == '/') {
1709                         if (len == 2 && fbuf[0] == '.') {
1710                                 /* Turn "./" into just "." rather than "./." */
1711                                 fbuf[1] = '\0';
1712                         } else {
1713                                 if (len + 1 >= MAXPATHLEN)
1714                                         overflow_exit("send_file_list");
1715                                 fbuf[len++] = '.';
1716                                 fbuf[len] = '\0';
1717                         }
1718                         is_dot_dir = 1;
1719                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1720                     && (len == 2 || fbuf[len-3] == '/')) {
1721                         if (len + 2 >= MAXPATHLEN)
1722                                 overflow_exit("send_file_list");
1723                         fbuf[len++] = '/';
1724                         fbuf[len++] = '.';
1725                         fbuf[len] = '\0';
1726                         is_dot_dir = 1;
1727                 } else {
1728                         is_dot_dir = fbuf[len-1] == '.'
1729                                    && (len == 1 || fbuf[len-2] == '/');
1730                 }
1731
1732                 dir = NULL;
1733
1734                 if (!relative_paths) {
1735                         p = strrchr(fbuf, '/');
1736                         if (p) {
1737                                 *p = '\0';
1738                                 if (p == fbuf)
1739                                         dir = "/";
1740                                 else
1741                                         dir = fbuf;
1742                                 len -= p - fbuf + 1;
1743                                 fn = p + 1;
1744                         } else
1745                                 fn = fbuf;
1746                 } else {
1747                         if ((p = strstr(fbuf, "/./")) != NULL) {
1748                                 *p = '\0';
1749                                 if (p == fbuf)
1750                                         dir = "/";
1751                                 else
1752                                         dir = fbuf;
1753                                 len -= p - fbuf + 3;
1754                                 fn = p + 3;
1755                         } else
1756                                 fn = fbuf;
1757                         /* Get rid of trailing "/" and "/.". */
1758                         while (len) {
1759                                 if (fn[len - 1] == '/') {
1760                                         is_dot_dir = 1;
1761                                         if (!--len && !dir) {
1762                                                 len++;
1763                                                 break;
1764                                         }
1765                                 }
1766                                 else if (len >= 2 && fn[len - 1] == '.'
1767                                                   && fn[len - 2] == '/') {
1768                                         is_dot_dir = 1;
1769                                         if (!(len -= 2) && !dir) {
1770                                                 len++;
1771                                                 break;
1772                                         }
1773                                 } else
1774                                         break;
1775                         }
1776                         if (len == 1 && fn[0] == '/')
1777                                 fn[len++] = '.';
1778                         fn[len] = '\0';
1779                         /* Reject a ".." dir in the active part of the path. */
1780                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1781                                 if ((p[2] == '/' || p[2] == '\0')
1782                                  && (p == fn || p[-1] == '/')) {
1783                                         rprintf(FERROR,
1784                                             "found \"..\" dir in relative path: %s\n",
1785                                             fbuf);
1786                                         exit_cleanup(RERR_SYNTAX);
1787                                 }
1788                         }
1789                 }
1790
1791                 if (!*fn) {
1792                         len = 1;
1793                         fn = ".";
1794                 }
1795
1796                 dirlen = dir ? strlen(dir) : 0;
1797                 if (dirlen != lastdir_len || memcmp(lastdir, dir, dirlen) != 0) {
1798                         if (!push_pathname(dir ? strdup(dir) : NULL, dirlen))
1799                                 continue;
1800                         lastdir = pathname;
1801                         lastdir_len = pathname_len;
1802                 } else if (!push_pathname(lastdir, lastdir_len))
1803                         continue;
1804
1805                 if (fn != fbuf)
1806                         memmove(fbuf, fn, len + 1);
1807
1808                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1809                         io_error |= IOERR_GENERAL;
1810                         rsyserr(FERROR, errno, "link_stat %s failed",
1811                                 full_fname(fbuf));
1812                         continue;
1813                 }
1814
1815                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1816                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1817                         continue;
1818                 }
1819
1820                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1821                         /* Send the implied directories at the start of the
1822                          * source spec, so we get their permissions right. */
1823                         char *lp = lastpath, *slash = fbuf;
1824                         *p = '\0';
1825                         /* Skip any initial directories in our path that we
1826                          * have in common with lastpath. */
1827                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1828                                 if (*fn == '/')
1829                                         slash = fn;
1830                         }
1831                         *p = '/';
1832                         if (fn != p || (*lp && *lp != '/')) {
1833                                 int save_copy_links = copy_links;
1834                                 int save_xfer_dirs = xfer_dirs;
1835                                 int dir_flags = flags & ~FLAG_XFER_DIR;
1836                                 copy_links |= copy_unsafe_links;
1837                                 xfer_dirs = 1;
1838                                 while ((slash = strchr(slash+1, '/')) != 0) {
1839                                         *slash = '\0';
1840                                         send_file_name(f, flist, fbuf, NULL,
1841                                                        dir_flags, ALL_FILTERS);
1842                                         *slash = '/';
1843                                 }
1844                                 copy_links = save_copy_links;
1845                                 xfer_dirs = save_xfer_dirs;
1846                                 *p = '\0';
1847                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1848                                 *p = '/';
1849                         }
1850                 }
1851
1852                 if (one_file_system)
1853                         filesystem_dev = st.st_dev;
1854
1855                 if (recurse || (xfer_dirs && is_dot_dir)) {
1856                         struct file_struct *file;
1857                         int top_flags = FLAG_TOP_DIR | flags;
1858                         file = send_file_name(f, flist, fbuf, &st,
1859                                               top_flags, ALL_FILTERS);
1860                         if (file && !inc_recurse)
1861                                 send_if_directory(f, flist, file, fbuf, len, flags);
1862                 } else
1863                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1864         }
1865
1866         gettimeofday(&end_tv, NULL);
1867         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1868                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1869         if (stats.flist_buildtime == 0)
1870                 stats.flist_buildtime = 1;
1871         start_tv = end_tv;
1872
1873         write_byte(f, 0); /* Indicate end of file list */
1874
1875 #ifdef SUPPORT_HARD_LINKS
1876         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1877                 idev_destroy();
1878 #endif
1879
1880         if (show_filelist_p())
1881                 finish_filelist_progress(flist);
1882
1883         gettimeofday(&end_tv, NULL);
1884         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1885                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1886
1887         /* When converting names, both sides keep an unsorted file-list array
1888          * because the names will differ on the sending and receiving sides
1889          * (both sides will use the unsorted index number for each item). */
1890
1891         /* Sort the list without removing any duplicates.  This allows the
1892          * receiving side to ask for whatever name it kept.  For incremental
1893          * recursion mode, the sender marks duplicate dirs so that it can
1894          * send them together in a single file-list. */
1895 #ifdef ICONV_OPTION
1896         if (need_unsorted_flist) {
1897                 if (inc_recurse) {
1898                         if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
1899                                 out_of_memory("send_file_list");
1900                         memcpy(flist->sorted, flist->files,
1901                                flist->used * sizeof (struct file_struct*));
1902                         clean_flist(flist, 0);
1903                 } else {
1904                         flist->sorted = flist->files;
1905                         flist->low = 0;
1906                         flist->high = flist->used - 1;
1907                 }
1908         } else
1909 #endif
1910         {
1911                 flist->sorted = flist->files;
1912                 clean_flist(flist, 0);
1913         }
1914         file_total += flist->used;
1915
1916         /* We don't subtract dir_count for the first send since we
1917          * might have one or more dot dirs which need to get sent. */
1918         flist->ndx_end = flist->ndx_start + flist->used - 1;
1919
1920         if (!numeric_ids && !inc_recurse)
1921                 send_id_list(f);
1922
1923         /* send the io_error flag */
1924         if (protocol_version < 30)
1925                 write_int(f, ignore_errors ? 0 : io_error);
1926         else if (io_error && !ignore_errors)
1927                 send_msg_int(MSG_IO_ERROR, io_error);
1928
1929         if (disable_buffering)
1930                 io_end_buffering_out();
1931
1932         stats.flist_size = stats.total_written - start_write;
1933         stats.num_files = flist->used;
1934
1935         if (verbose > 3)
1936                 output_flist(flist);
1937
1938         if (verbose > 2)
1939                 rprintf(FINFO, "send_file_list done\n");
1940
1941         if (inc_recurse) {
1942                 add_dirs_to_tree(-1, flist, dir_count);
1943                 flist_done_allocating(flist);
1944                 if (send_dir_ndx < 0) {
1945                         write_ndx(f, NDX_FLIST_EOF);
1946                         flist_eof = 1;
1947                 }
1948                 else if (file_total == 1) {
1949                         /* If we're creating incremental file-lists and there
1950                          * was just 1 item in the first file-list, send 1 more
1951                          * file-list to check if this is a 1-file xfer. */
1952                         send_extra_file_list(f, 1);
1953                 }
1954         }
1955
1956         return flist;
1957 }
1958
1959 struct file_list *recv_file_list(int f)
1960 {
1961         struct file_list *flist;
1962         int dstart, flags;
1963         int64 start_read;
1964
1965         if (!first_flist)
1966                 rprintf(FLOG, "receiving file list\n");
1967         if (show_filelist_p())
1968                 start_filelist_progress("receiving file list");
1969         else if (inc_recurse && verbose && !am_server && !first_flist)
1970                 rprintf(FCLIENT, "receiving incremental file list\n");
1971
1972         start_read = stats.total_read;
1973
1974 #ifdef SUPPORT_HARD_LINKS
1975         if (preserve_hard_links && !first_flist)
1976                 init_hard_links();
1977 #endif
1978
1979         flist = flist_new(0, "recv_file_list");
1980
1981         if (inc_recurse) {
1982                 if (flist->ndx_start == 0)
1983                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1984                 dstart = dir_flist->used;
1985         } else {
1986                 dir_flist = flist;
1987                 dstart = 0;
1988         }
1989
1990         while ((flags = read_byte(f)) != 0) {
1991                 struct file_struct *file;
1992
1993                 flist_expand(flist, 1);
1994
1995                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1996                         flags |= read_byte(f) << 8;
1997                 file = recv_file_entry(flist, flags, f);
1998
1999                 if (inc_recurse && S_ISDIR(file->mode)) {
2000                         flist_expand(dir_flist, 1);
2001                         dir_flist->files[dir_flist->used++] = file;
2002                 }
2003
2004                 flist->files[flist->used++] = file;
2005
2006                 maybe_emit_filelist_progress(flist->used);
2007
2008                 if (verbose > 2) {
2009                         rprintf(FINFO, "recv_file_name(%s)\n",
2010                                 f_name(file, NULL));
2011                 }
2012         }
2013         file_total += flist->used;
2014
2015         flist->ndx_end = flist->ndx_start + flist->used - 1;
2016         if (inc_recurse && flist->ndx_start)
2017                 flist->ndx_end -= dir_flist->used - dstart;
2018
2019         if (verbose > 2)
2020                 rprintf(FINFO, "received %d names\n", flist->used);
2021
2022         if (show_filelist_p())
2023                 finish_filelist_progress(flist);
2024
2025 #ifdef ICONV_OPTION
2026         if (need_unsorted_flist) {
2027                 /* Create an extra array of index pointers that we can sort for
2028                  * the generator's use (for wading through the files in sorted
2029                  * order and for calling flist_find()).  We keep the "files"
2030                  * list unsorted for our exchange of index numbers with the
2031                  * other side (since their names may not sort the same). */
2032                 if (!(flist->sorted = new_array(struct file_struct *, flist->used)))
2033                         out_of_memory("recv_file_list");
2034                 memcpy(flist->sorted, flist->files,
2035                        flist->used * sizeof (struct file_struct*));
2036                 if (inc_recurse && dir_flist->used > dstart) {
2037                         dir_flist->sorted = realloc_array(dir_flist->sorted,
2038                                                 struct file_struct *,
2039                                                 dir_flist->used);
2040                         memcpy(dir_flist->sorted + dstart, dir_flist->files + dstart,
2041                                (dir_flist->used - dstart) * sizeof (struct file_struct*));
2042                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2043                 }
2044         } else
2045 #endif
2046         {
2047                 flist->sorted = flist->files;
2048                 if (inc_recurse && dir_flist->used > dstart) {
2049                         dir_flist->sorted = dir_flist->files;
2050                         fsort(dir_flist->sorted + dstart, dir_flist->used - dstart);
2051                 }
2052         }
2053
2054         if (inc_recurse)
2055                 flist_done_allocating(flist);
2056         else if (f >= 0)
2057                 recv_id_list(f, flist);
2058
2059         clean_flist(flist, relative_paths);
2060
2061         if (protocol_version < 30) {
2062                 /* Recv the io_error flag */
2063                 if (ignore_errors)
2064                         read_int(f);
2065                 else
2066                         io_error |= read_int(f);
2067         }
2068
2069         if (verbose > 3)
2070                 output_flist(flist);
2071
2072         if (list_only) {
2073                 int i;
2074                 for (i = flist->low; i <= flist->high; i++)
2075                         list_file_entry(flist->files[i]);
2076         }
2077
2078         if (verbose > 2)
2079                 rprintf(FINFO, "recv_file_list done\n");
2080
2081         stats.flist_size += stats.total_read - start_read;
2082         stats.num_files += flist->used;
2083
2084         return flist;
2085 }
2086
2087 /* This is only used once by the receiver if the very first file-list
2088  * has exactly one item in it. */
2089 void recv_additional_file_list(int f)
2090 {
2091         struct file_list *flist;
2092         int ndx = read_ndx(f);
2093         if (ndx == NDX_FLIST_EOF) {
2094                 flist_eof = 1;
2095                 change_local_filter_dir(NULL, 0, 0);
2096         } else {
2097                 ndx = NDX_FLIST_OFFSET - ndx;
2098                 if (ndx < 0 || ndx >= dir_flist->used) {
2099                         ndx = NDX_FLIST_OFFSET - ndx;
2100                         rprintf(FERROR,
2101                                 "[%s] Invalid dir index: %d (%d - %d)\n",
2102                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
2103                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
2104                         exit_cleanup(RERR_PROTOCOL);
2105                 }
2106                 if (verbose > 3) {
2107                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
2108                                 who_am_i(), ndx);
2109                 }
2110                 flist = recv_file_list(f);
2111                 flist->parent_ndx = ndx;
2112         }
2113 }
2114
2115 /* Search for an identically-named item in the file list.  Note that the
2116  * items must agree in their directory-ness, or no match is returned. */
2117 int flist_find(struct file_list *flist, struct file_struct *f)
2118 {
2119         int low = flist->low, high = flist->high;
2120         int diff, mid, mid_up;
2121
2122         while (low <= high) {
2123                 mid = (low + high) / 2;
2124                 if (F_IS_ACTIVE(flist->sorted[mid]))
2125                         mid_up = mid;
2126                 else {
2127                         /* Scan for the next non-empty entry using the cached
2128                          * distance values.  If the value isn't fully up-to-
2129                          * date, update it. */
2130                         mid_up = mid + F_DEPTH(flist->sorted[mid]);
2131                         if (!F_IS_ACTIVE(flist->sorted[mid_up])) {
2132                                 do {
2133                                     mid_up += F_DEPTH(flist->sorted[mid_up]);
2134                                 } while (!F_IS_ACTIVE(flist->sorted[mid_up]));
2135                                 F_DEPTH(flist->sorted[mid]) = mid_up - mid;
2136                         }
2137                         if (mid_up > high) {
2138                                 /* If there's nothing left above us, set high to
2139                                  * a non-empty entry below us and continue. */
2140                                 high = mid - (int)flist->sorted[mid]->len32;
2141                                 if (!F_IS_ACTIVE(flist->sorted[high])) {
2142                                         do {
2143                                             high -= (int)flist->sorted[high]->len32;
2144                                         } while (!F_IS_ACTIVE(flist->sorted[high]));
2145                                         flist->sorted[mid]->len32 = mid - high;
2146                                 }
2147                                 continue;
2148                         }
2149                 }
2150                 diff = f_name_cmp(flist->sorted[mid_up], f);
2151                 if (diff == 0) {
2152                         if (protocol_version < 29
2153                             && S_ISDIR(flist->sorted[mid_up]->mode)
2154                             != S_ISDIR(f->mode))
2155                                 return -1;
2156                         return mid_up;
2157                 }
2158                 if (diff < 0)
2159                         low = mid_up + 1;
2160                 else
2161                         high = mid - 1;
2162         }
2163         return -1;
2164 }
2165
2166 /*
2167  * Free up any resources a file_struct has allocated
2168  * and clear the file.
2169  */
2170 void clear_file(struct file_struct *file)
2171 {
2172         /* The +1 zeros out the first char of the basename. */
2173         memset(file, 0, FILE_STRUCT_LEN + 1);
2174         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
2175          * entry.  Likewise for len32 in the opposite direction.  We assume
2176          * that we're alone for now since flist_find() will adjust the counts
2177          * it runs into that aren't up-to-date. */
2178         file->len32 = F_DEPTH(file) = 1;
2179 }
2180
2181 /* Allocate a new file list. */
2182 struct file_list *flist_new(int flags, char *msg)
2183 {
2184         struct file_list *flist;
2185
2186         flist = new0(struct file_list);
2187         if (!flist)
2188                 out_of_memory(msg);
2189
2190         if (flags & FLIST_TEMP) {
2191                 if (!(flist->file_pool = pool_create(SMALL_EXTENT, 0,
2192                                                 out_of_memory, POOL_INTERN)))
2193                         out_of_memory(msg);
2194         } else {
2195                 /* This is a doubly linked list with prev looping back to
2196                  * the end of the list, but the last next pointer is NULL. */
2197                 if (!first_flist) {
2198                         flist->file_pool = pool_create(NORMAL_EXTENT, 0,
2199                                                 out_of_memory, POOL_INTERN);
2200                         if (!flist->file_pool)
2201                                 out_of_memory(msg);
2202
2203                         first_flist = cur_flist = flist->prev = flist;
2204                 } else {
2205                         flist->file_pool = first_flist->file_pool;
2206
2207                         flist->ndx_start = first_flist->prev->ndx_end + 2;
2208                         if (flist->ndx_start <= high_hlink_ndx)
2209                                 flist->ndx_start = high_hlink_ndx + 1;
2210
2211                         flist->prev = first_flist->prev;
2212                         flist->prev->next = first_flist->prev = flist;
2213                 }
2214                 flist->pool_boundary = pool_boundary(flist->file_pool, 0);
2215                 flist_cnt++;
2216         }
2217
2218         return flist;
2219 }
2220
2221 /* Free up all elements in a flist. */
2222 void flist_free(struct file_list *flist)
2223 {
2224         if (!flist->prev) {
2225                 /* Was FLIST_TEMP dir-list. */
2226         } else if (flist == flist->prev) {
2227                 first_flist = cur_flist = NULL;
2228                 file_total = 0;
2229                 flist_cnt = 0;
2230         } else {
2231                 if (flist == cur_flist)
2232                         cur_flist = flist->next;
2233                 if (flist == first_flist)
2234                         first_flist = first_flist->next;
2235                 else {
2236                         flist->prev->next = flist->next;
2237                         if (!flist->next)
2238                                 flist->next = first_flist;
2239                 }
2240                 flist->next->prev = flist->prev;
2241                 file_total -= flist->used;
2242                 flist_cnt--;
2243         }
2244
2245         if (!flist->prev || !flist_cnt)
2246                 pool_destroy(flist->file_pool);
2247         else
2248                 pool_free_old(flist->file_pool, flist->pool_boundary);
2249
2250         if (flist->sorted && flist->sorted != flist->files)
2251                 free(flist->sorted);
2252         free(flist->files);
2253         free(flist);
2254 }
2255
2256 /* This routine ensures we don't have any duplicate names in our file list.
2257  * duplicate names can cause corruption because of the pipelining. */
2258 static void clean_flist(struct file_list *flist, int strip_root)
2259 {
2260         char fbuf[MAXPATHLEN];
2261         int i, prev_i;
2262
2263         if (!flist)
2264                 return;
2265         if (flist->used == 0) {
2266                 flist->high = -1;
2267                 flist->low = 0;
2268                 return;
2269         }
2270
2271         fsort(flist->sorted, flist->used);
2272
2273         if (!am_sender || inc_recurse) {
2274                 for (i = prev_i = 0; i < flist->used; i++) {
2275                         if (F_IS_ACTIVE(flist->sorted[i])) {
2276                                 prev_i = i;
2277                                 break;
2278                         }
2279                 }
2280                 flist->low = prev_i;
2281         } else {
2282                 i = prev_i = flist->used - 1;
2283                 flist->low = 0;
2284         }
2285
2286         while (++i < flist->used) {
2287                 int j;
2288                 struct file_struct *file = flist->sorted[i];
2289
2290                 if (!F_IS_ACTIVE(file))
2291                         continue;
2292                 if (f_name_cmp(file, flist->sorted[prev_i]) == 0)
2293                         j = prev_i;
2294                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
2295                         int save_mode = file->mode;
2296                         /* Make sure that this directory doesn't duplicate a
2297                          * non-directory earlier in the list. */
2298                         flist->high = prev_i;
2299                         file->mode = S_IFREG;
2300                         j = flist_find(flist, file);
2301                         file->mode = save_mode;
2302                 } else
2303                         j = -1;
2304                 if (j >= 0) {
2305                         int keep, drop;
2306                         /* If one is a dir and the other is not, we want to
2307                          * keep the dir because it might have contents in the
2308                          * list.  Otherwise keep the first one. */
2309                         if (S_ISDIR(file->mode)) {
2310                                 struct file_struct *fp = flist->sorted[j];
2311                                 if (!S_ISDIR(fp->mode) || !(fp->flags & FLAG_XFER_DIR))
2312                                         keep = i, drop = j;
2313                                 else {
2314                                         if (am_sender)
2315                                                 file->flags |= FLAG_DUPLICATE;
2316                                         keep = j, drop = i;
2317                                 }
2318                         } else
2319                                 keep = j, drop = i;
2320
2321                         if (!am_sender) {
2322                                 if (verbose > 1) {
2323                                         rprintf(FINFO,
2324                                             "removing duplicate name %s from file list (%d)\n",
2325                                             f_name(file, fbuf), drop + flist->ndx_start);
2326                                 }
2327                                 /* Make sure we don't lose track of a user-specified
2328                                  * top directory. */
2329                                 flist->sorted[keep]->flags |= flist->sorted[drop]->flags
2330                                                            & (FLAG_TOP_DIR|FLAG_XFER_DIR);
2331
2332                                 clear_file(flist->sorted[drop]);
2333                         }
2334
2335                         if (keep == i) {
2336                                 if (flist->low == drop) {
2337                                         for (j = drop + 1;
2338                                              j < i && !F_IS_ACTIVE(flist->sorted[j]);
2339                                              j++) {}
2340                                         flist->low = j;
2341                                 }
2342                                 prev_i = i;
2343                         }
2344                 } else
2345                         prev_i = i;
2346         }
2347         flist->high = prev_i;
2348
2349         if (strip_root) {
2350                 /* We need to strip off the leading slashes for relative
2351                  * paths, but this must be done _after_ the sorting phase. */
2352                 for (i = flist->low; i <= flist->high; i++) {
2353                         struct file_struct *file = flist->sorted[i];
2354
2355                         if (!file->dirname)
2356                                 continue;
2357                         while (*file->dirname == '/')
2358                                 file->dirname++;
2359                         if (!*file->dirname)
2360                                 file->dirname = NULL;
2361                 }
2362         }
2363
2364         if (prune_empty_dirs && !am_sender) {
2365                 int j, prev_depth = 0;
2366
2367                 prev_i = 0; /* It's OK that this isn't really true. */
2368
2369                 for (i = flist->low; i <= flist->high; i++) {
2370                         struct file_struct *fp, *file = flist->sorted[i];
2371
2372                         /* This temporarily abuses the F_DEPTH() value for a
2373                          * directory that is in a chain that might get pruned.
2374                          * We restore the old value if it gets a reprieve. */
2375                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2376                                 /* Dump empty dirs when coming back down. */
2377                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2378                                         fp = flist->sorted[prev_i];
2379                                         if (F_DEPTH(fp) >= 0)
2380                                                 break;
2381                                         prev_i = -F_DEPTH(fp)-1;
2382                                         clear_file(fp);
2383                                 }
2384                                 prev_depth = F_DEPTH(file);
2385                                 if (is_excluded(f_name(file, fbuf), 1,
2386                                                        ALL_FILTERS)) {
2387                                         /* Keep dirs through this dir. */
2388                                         for (j = prev_depth-1; ; j--) {
2389                                                 fp = flist->sorted[prev_i];
2390                                                 if (F_DEPTH(fp) >= 0)
2391                                                         break;
2392                                                 prev_i = -F_DEPTH(fp)-1;
2393                                                 F_DEPTH(fp) = j;
2394                                         }
2395                                 } else
2396                                         F_DEPTH(file) = -prev_i-1;
2397                                 prev_i = i;
2398                         } else {
2399                                 /* Keep dirs through this non-dir. */
2400                                 for (j = prev_depth; ; j--) {
2401                                         fp = flist->sorted[prev_i];
2402                                         if (F_DEPTH(fp) >= 0)
2403                                                 break;
2404                                         prev_i = -F_DEPTH(fp)-1;
2405                                         F_DEPTH(fp) = j;
2406                                 }
2407                         }
2408                 }
2409                 /* Dump all remaining empty dirs. */
2410                 while (1) {
2411                         struct file_struct *fp = flist->sorted[prev_i];
2412                         if (F_DEPTH(fp) >= 0)
2413                                 break;
2414                         prev_i = -F_DEPTH(fp)-1;
2415                         clear_file(fp);
2416                 }
2417
2418                 for (i = flist->low; i <= flist->high; i++) {
2419                         if (F_IS_ACTIVE(flist->sorted[i]))
2420                                 break;
2421                 }
2422                 flist->low = i;
2423                 for (i = flist->high; i >= flist->low; i--) {
2424                         if (F_IS_ACTIVE(flist->sorted[i]))
2425                                 break;
2426                 }
2427                 flist->high = i;
2428         }
2429 }
2430
2431 static void output_flist(struct file_list *flist)
2432 {
2433         char uidbuf[16], gidbuf[16], depthbuf[16];
2434         struct file_struct *file;
2435         const char *root, *dir, *slash, *name, *trail;
2436         const char *who = who_am_i();
2437         int i;
2438
2439         rprintf(FINFO, "[%s] flist start=%d, end=%d, used=%d, low=%d, high=%d\n",
2440                 who, flist->ndx_start, flist->ndx_end, flist->used, flist->low, flist->high);
2441         for (i = 0; i < flist->used; i++) {
2442                 file = flist->sorted[i];
2443                 if ((am_root || am_sender) && uid_ndx) {
2444                         snprintf(uidbuf, sizeof uidbuf, " uid=%u",
2445                                  F_OWNER(file));
2446                 } else
2447                         *uidbuf = '\0';
2448                 if (gid_ndx) {
2449                         static char parens[] = "(\0)\0\0\0";
2450                         char *pp = parens + (file->flags & FLAG_SKIP_GROUP ? 0 : 3);
2451                         snprintf(gidbuf, sizeof gidbuf, " gid=%s%u%s",
2452                                  pp, F_GROUP(file), pp + 2);
2453                 } else
2454                         *gidbuf = '\0';
2455                 if (!am_sender)
2456                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2457                 if (F_IS_ACTIVE(file)) {
2458                         root = am_sender ? NS(F_PATHNAME(file)) : depthbuf;
2459                         if ((dir = file->dirname) == NULL)
2460                                 dir = slash = "";
2461                         else
2462                                 slash = "/";
2463                         name = file->basename;
2464                         trail = S_ISDIR(file->mode) ? "/" : "";
2465                 } else
2466                         root = dir = slash = name = trail = "";
2467                 rprintf(FINFO,
2468                         "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2469                         who, i + flist->ndx_start,
2470                         root, dir, slash, name, trail,
2471                         (int)file->mode, (double)F_LENGTH(file),
2472                         uidbuf, gidbuf, file->flags);
2473         }
2474 }
2475
2476 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2477 enum fnc_type { t_PATH, t_ITEM };
2478
2479 static int found_prefix;
2480
2481 /* Compare the names of two file_struct entities, similar to how strcmp()
2482  * would do if it were operating on the joined strings.
2483  *
2484  * Some differences beginning with protocol_version 29: (1) directory names
2485  * are compared with an assumed trailing slash so that they compare in a
2486  * way that would cause them to sort immediately prior to any content they
2487  * may have; (2) a directory of any name compares after a non-directory of
2488  * any name at the same depth; (3) a directory with name "." compares prior
2489  * to anything else.  These changes mean that a directory and a non-dir
2490  * with the same name will not compare as equal (protocol_version >= 29).
2491  *
2492  * The dirname component can be an empty string, but the basename component
2493  * cannot (and never is in the current codebase).  The basename component
2494  * may be NULL (for a removed item), in which case it is considered to be
2495  * after any existing item. */
2496 int f_name_cmp(const struct file_struct *f1, const struct file_struct *f2)
2497 {
2498         int dif;
2499         const uchar *c1, *c2;
2500         enum fnc_state state1, state2;
2501         enum fnc_type type1, type2;
2502         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2503
2504         if (!f1 || !F_IS_ACTIVE(f1)) {
2505                 if (!f2 || !F_IS_ACTIVE(f2))
2506                         return 0;
2507                 return -1;
2508         }
2509         if (!f2 || !F_IS_ACTIVE(f2))
2510                 return 1;
2511
2512         c1 = (uchar*)f1->dirname;
2513         c2 = (uchar*)f2->dirname;
2514         if (c1 == c2)
2515                 c1 = c2 = NULL;
2516         if (!c1) {
2517                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2518                 c1 = (const uchar*)f1->basename;
2519                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2520                         type1 = t_ITEM;
2521                         state1 = s_TRAILING;
2522                         c1 = (uchar*)"";
2523                 } else
2524                         state1 = s_BASE;
2525         } else {
2526                 type1 = t_path;
2527                 state1 = s_DIR;
2528         }
2529         if (!c2) {
2530                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2531                 c2 = (const uchar*)f2->basename;
2532                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2533                         type2 = t_ITEM;
2534                         state2 = s_TRAILING;
2535                         c2 = (uchar*)"";
2536                 } else
2537                         state2 = s_BASE;
2538         } else {
2539                 type2 = t_path;
2540                 state2 = s_DIR;
2541         }
2542
2543         if (type1 != type2)
2544                 return type1 == t_PATH ? 1 : -1;
2545
2546         do {
2547                 if (!*c1) {
2548                         switch (state1) {
2549                         case s_DIR:
2550                                 state1 = s_SLASH;
2551                                 c1 = (uchar*)"/";
2552                                 break;
2553                         case s_SLASH:
2554                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2555                                 c1 = (const uchar*)f1->basename;
2556                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2557                                         type1 = t_ITEM;
2558                                         state1 = s_TRAILING;
2559                                         c1 = (uchar*)"";
2560                                 } else
2561                                         state1 = s_BASE;
2562                                 break;
2563                         case s_BASE:
2564                                 state1 = s_TRAILING;
2565                                 if (type1 == t_PATH) {
2566                                         c1 = (uchar*)"/";
2567                                         break;
2568                                 }
2569                                 /* FALL THROUGH */
2570                         case s_TRAILING:
2571                                 type1 = t_ITEM;
2572                                 break;
2573                         }
2574                         if (*c2 && type1 != type2)
2575                                 return type1 == t_PATH ? 1 : -1;
2576                 }
2577                 if (!*c2) {
2578                         switch (state2) {
2579                         case s_DIR:
2580                                 state2 = s_SLASH;
2581                                 c2 = (uchar*)"/";
2582                                 break;
2583                         case s_SLASH:
2584                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2585                                 c2 = (const uchar*)f2->basename;
2586                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2587                                         type2 = t_ITEM;
2588                                         state2 = s_TRAILING;
2589                                         c2 = (uchar*)"";
2590                                 } else
2591                                         state2 = s_BASE;
2592                                 break;
2593                         case s_BASE:
2594                                 state2 = s_TRAILING;
2595                                 if (type2 == t_PATH) {
2596                                         c2 = (uchar*)"/";
2597                                         break;
2598                                 }
2599                                 /* FALL THROUGH */
2600                         case s_TRAILING:
2601                                 found_prefix = 1;
2602                                 if (!*c1)
2603                                         return 0;
2604                                 type2 = t_ITEM;
2605                                 break;
2606                         }
2607                         if (type1 != type2)
2608                                 return type1 == t_PATH ? 1 : -1;
2609                 }
2610         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2611
2612         return dif;
2613 }
2614
2615 /* Returns 1 if f1's filename has all of f2's filename as a prefix.  This does
2616  * not match if f2's basename is not an exact match of a path element in f1.
2617  * E.g. /path/foo is not a prefix of /path/foobar/baz, but /path/foobar is. */
2618 int f_name_has_prefix(const struct file_struct *f1, const struct file_struct *f2)
2619 {
2620         found_prefix = 0;
2621         f_name_cmp(f1, f2);
2622         return found_prefix;
2623 }
2624
2625 char *f_name_buf(void)
2626 {
2627         static char names[5][MAXPATHLEN];
2628         static unsigned int n;
2629
2630         n = (n + 1) % (sizeof names / sizeof names[0]);
2631
2632         return names[n];
2633 }
2634
2635 /* Return a copy of the full filename of a flist entry, using the indicated
2636  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2637  * done because we checked the size when creating the file_struct entry.
2638  */
2639 char *f_name(const struct file_struct *f, char *fbuf)
2640 {
2641         if (!f || !F_IS_ACTIVE(f))
2642                 return NULL;
2643
2644         if (!fbuf)
2645                 fbuf = f_name_buf();
2646
2647         if (f->dirname) {
2648                 int len = strlen(f->dirname);
2649                 memcpy(fbuf, f->dirname, len);
2650                 fbuf[len] = '/';
2651                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2652         } else
2653                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2654
2655         return fbuf;
2656 }
2657
2658 /* Do a non-recursive scan of the named directory, possibly ignoring all
2659  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2660  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2661  * buffer (the functions we call will append names onto the end, but the old
2662  * dir value will be restored on exit). */
2663 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2664 {
2665         struct file_list *dirlist;
2666         char dirbuf[MAXPATHLEN];
2667         int save_recurse = recurse;
2668         int save_xfer_dirs = xfer_dirs;
2669         int save_prune_empty_dirs = prune_empty_dirs;
2670
2671         if (dlen < 0) {
2672                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2673                 if (dlen >= MAXPATHLEN)
2674                         return NULL;
2675                 dirname = dirbuf;
2676         }
2677
2678         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2679
2680         recurse = 0;
2681         xfer_dirs = 1;
2682         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen, 0);
2683         xfer_dirs = save_xfer_dirs;
2684         recurse = save_recurse;
2685         if (do_progress)
2686                 flist_count_offset += dirlist->used;
2687
2688         prune_empty_dirs = 0;
2689         dirlist->sorted = dirlist->files;
2690         clean_flist(dirlist, 0);
2691         prune_empty_dirs = save_prune_empty_dirs;
2692
2693         if (verbose > 3)
2694                 output_flist(dirlist);
2695
2696         return dirlist;
2697 }