flist.c

   1 /*
   2  * Generate and receive file lists.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2001, 2002 Martin Pool <mbp@samba.org>
   7  * Copyright (C) 2002-2007 Wayne Davison
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, write to the Free Software Foundation, Inc.,
  20  * 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  21  */
  22
  23 #include "rsync.h"
  24 #include "rounding.h"
  25 #include "io.h"
  26
  27 extern int verbose;
  28 extern int list_only;
  29 extern int am_root;
  30 extern int am_server;
  31 extern int am_daemon;
  32 extern int am_sender;
  33 extern int inc_recurse;
  34 extern int do_progress;
  35 extern int always_checksum;
  36 extern int module_id;
  37 extern int ignore_errors;
  38 extern int numeric_ids;
  39 extern int recurse;
  40 extern int xfer_dirs;
  41 extern int filesfrom_fd;
  42 extern int one_file_system;
  43 extern int copy_dirlinks;
  44 extern int keep_dirlinks;
  45 extern int preserve_acls;
  46 extern int preserve_links;
  47 extern int preserve_hard_links;
  48 extern int preserve_devices;
  49 extern int preserve_specials;
  50 extern int preserve_uid;
  51 extern int preserve_gid;
  52 extern int relative_paths;
  53 extern int implied_dirs;
  54 extern int file_extra_cnt;
  55 extern int ignore_perishable;
  56 extern int non_perishable_cnt;
  57 extern int prune_empty_dirs;
  58 extern int copy_links;
  59 extern int copy_unsafe_links;
  60 extern int protocol_version;
  61 extern int sanitize_paths;
  62 extern struct stats stats;
  63
  64 extern char curr_dir[MAXPATHLEN];
  65
  66 extern struct chmod_mode_struct *chmod_modes;
  67
  68 extern struct filter_list_struct filter_list;
  69 extern struct filter_list_struct server_filter_list;
  70
  71 int io_error;
  72 int checksum_len;
  73 dev_t filesystem_dev; /* used to implement -x */
  74
  75 struct file_list *cur_flist, *first_flist, *dir_flist;
  76 int send_dir_ndx = -1, send_dir_depth = 0;
  77 int flist_cnt = 0; /* how many (non-tmp) file list objects exist */
  78 int file_total = 0; /* total of all active items over all file-lists */
  79 int flist_eof = 0; /* all the file-lists are now known */
  80
  81 /* The tmp_* vars are used as a cache area by make_file() to store data
  82  * that the sender doesn't need to remember in its file list.  The data
  83  * will survive just long enough to be used by send_file_entry(). */
  84 static dev_t tmp_rdev;
  85 #ifdef SUPPORT_HARD_LINKS
  86 static int64 tmp_dev, tmp_ino;
  87 #endif
  88 static char tmp_sum[MD4_SUM_LENGTH];
  89
  90 static char empty_sum[MD4_SUM_LENGTH];
  91 static int flist_count_offset; /* for --delete --progress */
  92
  93 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  94 static void output_flist(struct file_list *flist);
  95
  96 void init_flist(void)
  97 {
  98         if (verbose > 4) {
  99                 rprintf(FINFO, "FILE_STRUCT_LEN=%d, EXTRA_LEN=%d\n",
 100                         (int)FILE_STRUCT_LEN, (int)EXTRA_LEN);
 101         }
 102         checksum_len = protocol_version < 21 ? 2 : MD4_SUM_LENGTH;
 103 }
 104
 105 static int show_filelist_p(void)
 106 {
 107         return verbose && xfer_dirs && !am_server && !inc_recurse;
 108 }
 109
 110 static void start_filelist_progress(char *kind)
 111 {
 112         rprintf(FCLIENT, "%s ... ", kind);
 113         if (verbose > 1 || do_progress)
 114                 rprintf(FCLIENT, "\n");
 115         rflush(FINFO);
 116 }
 117
 118 static void emit_filelist_progress(int count)
 119 {
 120         rprintf(FCLIENT, " %d files...\r", count);
 121 }
 122
 123 static void maybe_emit_filelist_progress(int count)
 124 {
 125         if (do_progress && show_filelist_p() && (count % 100) == 0)
 126                 emit_filelist_progress(count);
 127 }
 128
 129 static void finish_filelist_progress(const struct file_list *flist)
 130 {
 131         if (do_progress) {
 132                 /* This overwrites the progress line */
 133                 rprintf(FINFO, "%d file%sto consider\n",
 134                         flist->count, flist->count == 1 ? " " : "s ");
 135         } else
 136                 rprintf(FINFO, "done\n");
 137 }
 138
 139 void show_flist_stats(void)
 140 {
 141         /* Nothing yet */
 142 }
 143
 144 static void list_file_entry(struct file_struct *f)
 145 {
 146         char permbuf[PERMSTRING_SIZE];
 147         double len;
 148
 149         if (!F_IS_ACTIVE(f)) {
 150                 /* this can happen if duplicate names were removed */
 151                 return;
 152         }
 153
 154         permstring(permbuf, f->mode);
 155         len = F_LENGTH(f);
 156
 157         /* TODO: indicate '+' if the entry has an ACL. */
 158
 159 #ifdef SUPPORT_LINKS
 160         if (preserve_links && S_ISLNK(f->mode)) {
 161                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 162                         permbuf, len, timestring(f->modtime),
 163                         f_name(f, NULL), F_SYMLINK(f));
 164         } else
 165 #endif
 166         {
 167                 rprintf(FINFO, "%s %11.0f %s %s\n",
 168                         permbuf, len, timestring(f->modtime),
 169                         f_name(f, NULL));
 170         }
 171 }
 172
 173 /* Stat either a symlink or its referent, depending on the settings of
 174  * copy_links, copy_unsafe_links, etc.  Returns -1 on error, 0 on success.
 175  *
 176  * If path is the name of a symlink, then the linkbuf buffer (which must hold
 177  * MAXPATHLEN chars) will be set to the symlink's target string.
 178  *
 179  * The stat structure pointed to by stp will contain information about the
 180  * link or the referent as appropriate, if they exist. */
 181 static int readlink_stat(const char *path, STRUCT_STAT *stp, char *linkbuf)
 182 {
 183 #ifdef SUPPORT_LINKS
 184         if (link_stat(path, stp, copy_dirlinks) < 0)
 185                 return -1;
 186         if (S_ISLNK(stp->st_mode)) {
 187                 int llen = readlink(path, linkbuf, MAXPATHLEN - 1);
 188                 if (llen < 0)
 189                         return -1;
 190                 linkbuf[llen] = '\0';
 191                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 192                         if (verbose > 1) {
 193                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 194                                         path, linkbuf);
 195                         }
 196                         return do_stat(path, stp);
 197                 }
 198         }
 199         return 0;
 200 #else
 201         return do_stat(path, stp);
 202 #endif
 203 }
 204
 205 int link_stat(const char *path, STRUCT_STAT *stp, int follow_dirlinks)
 206 {
 207 #ifdef SUPPORT_LINKS
 208         if (copy_links)
 209                 return do_stat(path, stp);
 210         if (do_lstat(path, stp) < 0)
 211                 return -1;
 212         if (follow_dirlinks && S_ISLNK(stp->st_mode)) {
 213                 STRUCT_STAT st;
 214                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 215                         *stp = st;
 216         }
 217         return 0;
 218 #else
 219         return do_stat(path, stp);
 220 #endif
 221 }
 222
 223 /* This function is used to check if a file should be included/excluded
 224  * from the list of files based on its name and type etc.  The value of
 225  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 226 static int is_excluded(char *fname, int is_dir, int filter_level)
 227 {
 228 #if 0 /* This currently never happens, so avoid a useless compare. */
 229         if (filter_level == NO_FILTERS)
 230                 return 0;
 231 #endif
 232         if (fname) {
 233                 /* never exclude '.', even if somebody does --exclude '*' */
 234                 if (fname[0] == '.' && !fname[1])
 235                         return 0;
 236                 /* Handle the -R version of the '.' dir. */
 237                 if (fname[0] == '/') {
 238                         int len = strlen(fname);
 239                         if (fname[len-1] == '.' && fname[len-2] == '/')
 240                                 return 0;
 241                 }
 242         }
 243         if (server_filter_list.head
 244             && check_filter(&server_filter_list, fname, is_dir) < 0)
 245                 return 1;
 246         if (filter_level != ALL_FILTERS)
 247                 return 0;
 248         if (filter_list.head
 249             && check_filter(&filter_list, fname, is_dir) < 0)
 250                 return 1;
 251         return 0;
 252 }
 253
 254 static int to_wire_mode(mode_t mode)
 255 {
 256 #ifdef SUPPORT_LINKS
 257 #if _S_IFLNK != 0120000
 258         if (S_ISLNK(mode))
 259                 return (mode & ~(_S_IFMT)) | 0120000;
 260 #endif
 261 #endif
 262         return mode;
 263 }
 264
 265 static mode_t from_wire_mode(int mode)
 266 {
 267 #if _S_IFLNK != 0120000
 268         if ((mode & (_S_IFMT)) == 0120000)
 269                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 270 #endif
 271         return mode;
 272 }
 273
 274 static void send_directory(int f, struct file_list *flist, int ndx,
 275                            char *fbuf, int len, int flags);
 276
 277 static const char *flist_dir, *orig_dir;
 278 static int flist_dir_len;
 279
 280
 281 /**
 282  * Make sure @p flist is big enough to hold at least @p flist->count
 283  * entries.
 284  **/
 285 void flist_expand(struct file_list *flist)
 286 {
 287         struct file_struct **new_ptr;
 288
 289         if (flist->count < flist->malloced)
 290                 return;
 291
 292         if (flist->malloced < FLIST_START)
 293                 flist->malloced = FLIST_START;
 294         else if (flist->malloced >= FLIST_LINEAR)
 295                 flist->malloced += FLIST_LINEAR;
 296         else
 297                 flist->malloced *= 2;
 298
 299         /*
 300          * In case count jumped or we are starting the list
 301          * with a known size just set it.
 302          */
 303         if (flist->malloced < flist->count)
 304                 flist->malloced = flist->count;
 305
 306         new_ptr = realloc_array(flist->files, struct file_struct *,
 307                                 flist->malloced);
 308
 309         if (verbose >= 2 && flist->malloced != FLIST_START) {
 310                 rprintf(FCLIENT, "[%s] expand file_list to %.0f bytes, did%s move\n",
 311                     who_am_i(),
 312                     (double)sizeof flist->files[0] * flist->malloced,
 313                     (new_ptr == flist->files) ? " not" : "");
 314         }
 315
 316         flist->files = new_ptr;
 317
 318         if (!flist->files)
 319                 out_of_memory("flist_expand");
 320 }
 321
 322 int push_flist_dir(const char *dir, int len)
 323 {
 324         if (dir == flist_dir)
 325                 return 1;
 326
 327         if (!orig_dir)
 328                 orig_dir = strdup(curr_dir);
 329
 330         if (flist_dir && !pop_dir(orig_dir)) {
 331                 rsyserr(FERROR, errno, "pop_dir %s failed",
 332                         full_fname(orig_dir));
 333                 exit_cleanup(RERR_FILESELECT);
 334         }
 335
 336         if (dir && !push_dir(dir, 0)) {
 337                 io_error |= IOERR_GENERAL;
 338                 rsyserr(FERROR, errno, "push_dir %s failed",
 339                         full_fname(dir));
 340                 return 0;
 341         }
 342
 343         flist_dir = dir;
 344         flist_dir_len = len >= 0 ? len : dir ? (int)strlen(dir) : 0;
 345
 346         return 1;
 347 }
 348
 349 static void send_file_entry(int f, struct file_struct *file, int ndx)
 350 {
 351         static time_t modtime;
 352         static mode_t mode;
 353         static int64 dev;
 354         static dev_t rdev;
 355         static uint32 rdev_major;
 356         static uid_t uid;
 357         static gid_t gid;
 358         static char *user_name, *group_name;
 359         static char lastname[MAXPATHLEN];
 360         char fname[MAXPATHLEN];
 361         int first_hlink_ndx = -1;
 362         int l1, l2;
 363         int flags;
 364
 365         f_name(file, fname);
 366
 367         flags = file->flags & FLAG_TOP_DIR; /* FLAG_TOP_DIR == XMIT_TOP_DIR */
 368
 369         if (file->mode == mode)
 370                 flags |= XMIT_SAME_MODE;
 371         else
 372                 mode = file->mode;
 373         if ((preserve_devices && IS_DEVICE(mode))
 374          || (preserve_specials && IS_SPECIAL(mode))) {
 375                 if (protocol_version < 28) {
 376                         if (tmp_rdev == rdev)
 377                                 flags |= XMIT_SAME_RDEV_pre28;
 378                         else
 379                                 rdev = tmp_rdev;
 380                 } else {
 381                         rdev = tmp_rdev;
 382                         if ((uint32)major(rdev) == rdev_major)
 383                                 flags |= XMIT_SAME_RDEV_MAJOR;
 384                         else
 385                                 rdev_major = major(rdev);
 386                         if ((uint32)minor(rdev) <= 0xFFu)
 387                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 388                 }
 389         } else if (protocol_version < 28)
 390                 rdev = MAKEDEV(0, 0);
 391         if (preserve_uid) {
 392                 if (F_UID(file) == uid && *lastname)
 393                         flags |= XMIT_SAME_UID;
 394                 else {
 395                         uid = F_UID(file);
 396                         if (preserve_uid && !numeric_ids) {
 397                                 user_name = add_uid(uid);
 398                                 if (inc_recurse && user_name)
 399                                         flags |= XMIT_USER_NAME_FOLLOWS;
 400                         }
 401                 }
 402         }
 403         if (preserve_gid) {
 404                 if (F_GID(file) == gid && *lastname)
 405                         flags |= XMIT_SAME_GID;
 406                 else {
 407                         gid = F_GID(file);
 408                         if (preserve_gid && !numeric_ids) {
 409                                 group_name = add_gid(gid);
 410                                 if (inc_recurse && group_name)
 411                                         flags |= XMIT_GROUP_NAME_FOLLOWS;
 412                         }
 413                 }
 414         }
 415         if (file->modtime == modtime)
 416                 flags |= XMIT_SAME_TIME;
 417         else
 418                 modtime = file->modtime;
 419
 420 #ifdef SUPPORT_HARD_LINKS
 421         if (tmp_dev != 0) {
 422                 if (protocol_version >= 30) {
 423                         struct idev_node *np = idev_node(tmp_dev, tmp_ino);
 424                         first_hlink_ndx = (int32)(long)np->data - 1;
 425                         if (first_hlink_ndx < 0) {
 426                                 np->data = (void*)(long)(ndx + 1);
 427                                 flags |= XMIT_HLINK_FIRST;
 428                         }
 429                         flags |= XMIT_HLINKED;
 430                 } else {
 431                         if (tmp_dev == dev) {
 432                                 if (protocol_version >= 28)
 433                                         flags |= XMIT_SAME_DEV_pre30;
 434                         } else
 435                                 dev = tmp_dev;
 436                         flags |= XMIT_HLINKED;
 437                 }
 438         }
 439 #endif
 440
 441         for (l1 = 0;
 442             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 443             l1++) {}
 444         l2 = strlen(fname+l1);
 445
 446         if (l1 > 0)
 447                 flags |= XMIT_SAME_NAME;
 448         if (l2 > 255)
 449                 flags |= XMIT_LONG_NAME;
 450
 451         /* We must make sure we don't send a zero flag byte or the
 452          * other end will terminate the flist transfer.  Note that
 453          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 454          * it's harmless way to add a bit to the first flag byte. */
 455         if (protocol_version >= 28) {
 456                 if (!flags && !S_ISDIR(mode))
 457                         flags |= XMIT_TOP_DIR;
 458                 if ((flags & 0xFF00) || !flags) {
 459                         flags |= XMIT_EXTENDED_FLAGS;
 460                         write_shortint(f, flags);
 461                 } else
 462                         write_byte(f, flags);
 463         } else {
 464                 if (!(flags & 0xFF))
 465                         flags |= S_ISDIR(mode) ? XMIT_LONG_NAME : XMIT_TOP_DIR;
 466                 write_byte(f, flags);
 467         }
 468         if (flags & XMIT_SAME_NAME)
 469                 write_byte(f, l1);
 470         if (flags & XMIT_LONG_NAME)
 471                 write_abbrevint30(f, l2);
 472         else
 473                 write_byte(f, l2);
 474         write_buf(f, fname + l1, l2);
 475
 476         if (first_hlink_ndx >= 0) {
 477                 write_abbrevint30(f, first_hlink_ndx);
 478                 goto the_end;
 479         }
 480
 481         write_longint(f, F_LENGTH(file));
 482         if (!(flags & XMIT_SAME_TIME))
 483                 write_int(f, modtime);
 484         if (!(flags & XMIT_SAME_MODE))
 485                 write_int(f, to_wire_mode(mode));
 486         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 487                 write_abbrevint30(f, uid);
 488                 if (flags & XMIT_USER_NAME_FOLLOWS) {
 489                         int len = strlen(user_name);
 490                         write_byte(f, len);
 491                         write_buf(f, user_name, len);
 492                 }
 493         }
 494         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 495                 write_abbrevint30(f, gid);
 496                 if (flags & XMIT_GROUP_NAME_FOLLOWS) {
 497                         int len = strlen(group_name);
 498                         write_byte(f, len);
 499                         write_buf(f, group_name, len);
 500                 }
 501         }
 502         if ((preserve_devices && IS_DEVICE(mode))
 503          || (preserve_specials && IS_SPECIAL(mode))) {
 504                 if (protocol_version < 28) {
 505                         if (!(flags & XMIT_SAME_RDEV_pre28))
 506                                 write_int(f, (int)rdev);
 507                 } else {
 508                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 509                                 write_int(f, major(rdev));
 510                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 511                                 write_byte(f, minor(rdev));
 512                         else
 513                                 write_int(f, minor(rdev));
 514                 }
 515         }
 516
 517 #ifdef SUPPORT_LINKS
 518         if (preserve_links && S_ISLNK(mode)) {
 519                 const char *sl = F_SYMLINK(file);
 520                 int len = strlen(sl);
 521                 write_abbrevint30(f, len);
 522                 write_buf(f, sl, len);
 523         }
 524 #endif
 525
 526 #ifdef SUPPORT_HARD_LINKS
 527         if (tmp_dev != 0 && protocol_version < 30) {
 528                 if (protocol_version < 26) {
 529                         /* 32-bit dev_t and ino_t */
 530                         write_int(f, (int32)dev);
 531                         write_int(f, (int32)tmp_ino);
 532                 } else {
 533                         /* 64-bit dev_t and ino_t */
 534                         if (!(flags & XMIT_SAME_DEV_pre30))
 535                                 write_longint(f, dev);
 536                         write_longint(f, tmp_ino);
 537                 }
 538         }
 539 #endif
 540
 541         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 542                 const char *sum;
 543                 if (S_ISREG(mode))
 544                         sum = tmp_sum;
 545                 else {
 546                         /* Prior to 28, we sent a useless set of nulls. */
 547                         sum = empty_sum;
 548                 }
 549                 write_buf(f, sum, checksum_len);
 550         }
 551
 552   the_end:
 553         strlcpy(lastname, fname, MAXPATHLEN);
 554
 555         if (S_ISREG(mode) || S_ISLNK(mode))
 556                 stats.total_size += F_LENGTH(file);
 557 }
 558
 559 static struct file_struct *recv_file_entry(struct file_list *flist,
 560                                            int flags, int f)
 561 {
 562         static time_t modtime;
 563         static mode_t mode;
 564         static int64 dev;
 565         static dev_t rdev;
 566         static uint32 rdev_major;
 567         static uid_t uid;
 568         static gid_t gid;
 569         static char lastname[MAXPATHLEN], *lastdir;
 570         static int lastdir_depth, lastdir_len = -1;
 571         static unsigned int del_hier_name_len = 0;
 572         static int in_del_hier = 0;
 573         char thisname[MAXPATHLEN];
 574         unsigned int l1 = 0, l2 = 0;
 575         int alloc_len, basename_len, linkname_len;
 576         int extra_len = file_extra_cnt * EXTRA_LEN;
 577         int first_hlink_ndx = -1;
 578         OFF_T file_length;
 579         const char *basename;
 580         char *bp;
 581         struct file_struct *file;
 582
 583         if (flags & XMIT_SAME_NAME)
 584                 l1 = read_byte(f);
 585
 586         if (flags & XMIT_LONG_NAME)
 587                 l2 = read_abbrevint30(f);
 588         else
 589                 l2 = read_byte(f);
 590
 591         if (l2 >= MAXPATHLEN - l1) {
 592                 rprintf(FERROR,
 593                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s [%s]\n",
 594                         flags, l1, l2, lastname, who_am_i());
 595                 overflow_exit("recv_file_entry");
 596         }
 597
 598         strlcpy(thisname, lastname, l1 + 1);
 599         read_sbuf(f, &thisname[l1], l2);
 600         thisname[l1 + l2] = 0;
 601
 602         strlcpy(lastname, thisname, MAXPATHLEN);
 603
 604         clean_fname(thisname, 0);
 605
 606         if (sanitize_paths)
 607                 sanitize_path(thisname, thisname, "", 0, NULL);
 608
 609         if ((basename = strrchr(thisname, '/')) != NULL) {
 610                 int len = basename++ - thisname;
 611                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
 612                         lastdir = new_array(char, len + 1);
 613                         memcpy(lastdir, thisname, len);
 614                         lastdir[len] = '\0';
 615                         lastdir_len = len;
 616                         lastdir_depth = count_dir_elements(lastdir);
 617                 }
 618         } else
 619                 basename = thisname;
 620         basename_len = strlen(basename) + 1; /* count the '\0' */
 621
 622 #ifdef SUPPORT_HARD_LINKS
 623         if (protocol_version >= 30
 624          && BITS_SETnUNSET(flags, XMIT_HLINKED, XMIT_HLINK_FIRST)) {
 625                 struct file_struct *first;
 626                 first_hlink_ndx = read_abbrevint30(f);
 627                 if (first_hlink_ndx < 0 || first_hlink_ndx >= flist->count) {
 628                         rprintf(FERROR,
 629                                 "hard-link reference out of range: %d (%d)\n",
 630                                 first_hlink_ndx, flist->count);
 631                         exit_cleanup(RERR_PROTOCOL);
 632                 }
 633                 first = flist->files[first_hlink_ndx];
 634                 file_length = F_LENGTH(first);
 635                 modtime = first->modtime;
 636                 mode = first->mode;
 637                 if (preserve_uid)
 638                         uid = F_UID(first);
 639                 if (preserve_gid)
 640                         gid = F_GID(first);
 641                 if ((preserve_devices && IS_DEVICE(mode))
 642                  || (preserve_specials && IS_SPECIAL(mode))) {
 643                         uint32 *devp = F_RDEV_P(first);
 644                         rdev = MAKEDEV(DEV_MAJOR(devp), DEV_MINOR(devp));
 645                         extra_len += 2 * EXTRA_LEN;
 646                 }
 647                 if (preserve_links && S_ISLNK(mode))
 648                         linkname_len = strlen(F_SYMLINK(first)) + 1;
 649                 else
 650                         linkname_len = 0;
 651                 goto create_object;
 652         }
 653 #endif
 654
 655         file_length = read_longint(f);
 656         if (!(flags & XMIT_SAME_TIME))
 657                 modtime = (time_t)read_int(f);
 658         if (!(flags & XMIT_SAME_MODE))
 659                 mode = from_wire_mode(read_int(f));
 660
 661         if (chmod_modes && !S_ISLNK(mode))
 662                 mode = tweak_mode(mode, chmod_modes);
 663
 664         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 665                 uid = (uid_t)read_abbrevint30(f);
 666                 if (flags & XMIT_USER_NAME_FOLLOWS)
 667                         uid = recv_user_name(f, uid);
 668                 else if (inc_recurse && am_root && !numeric_ids)
 669                         uid = match_uid(uid);
 670         }
 671         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 672                 gid = (gid_t)read_abbrevint30(f);
 673                 if (flags & XMIT_GROUP_NAME_FOLLOWS)
 674                         gid = recv_group_name(f, gid);
 675                 else if (inc_recurse && (!am_root || !numeric_ids))
 676                         gid = match_gid(gid);
 677         }
 678
 679         if ((preserve_devices && IS_DEVICE(mode))
 680          || (preserve_specials && IS_SPECIAL(mode))) {
 681                 if (protocol_version < 28) {
 682                         if (!(flags & XMIT_SAME_RDEV_pre28))
 683                                 rdev = (dev_t)read_int(f);
 684                 } else {
 685                         uint32 rdev_minor;
 686                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 687                                 rdev_major = read_int(f);
 688                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 689                                 rdev_minor = read_byte(f);
 690                         else
 691                                 rdev_minor = read_int(f);
 692                         rdev = MAKEDEV(rdev_major, rdev_minor);
 693                 }
 694                 extra_len += 2 * EXTRA_LEN;
 695                 file_length = 0;
 696         } else if (protocol_version < 28)
 697                 rdev = MAKEDEV(0, 0);
 698
 699 #ifdef SUPPORT_LINKS
 700         if (preserve_links && S_ISLNK(mode)) {
 701                 linkname_len = read_abbrevint30(f) + 1; /* count the '\0' */
 702                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 703                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 704                                 linkname_len - 1);
 705                         overflow_exit("recv_file_entry");
 706                 }
 707         }
 708         else
 709 #endif
 710                 linkname_len = 0;
 711
 712 #ifdef SUPPORT_HARD_LINKS
 713   create_object:
 714         if (preserve_hard_links) {
 715                 if (protocol_version < 28 && S_ISREG(mode))
 716                         flags |= XMIT_HLINKED;
 717                 if (flags & XMIT_HLINKED)
 718                         extra_len += EXTRA_LEN;
 719         }
 720 #endif
 721
 722 #ifdef SUPPORT_ACLS
 723         /* We need one or two index int32s when we're preserving ACLs. */
 724         if (preserve_acls)
 725                 extra_len += (S_ISDIR(mode) ? 2 : 1) * EXTRA_LEN;
 726 #endif
 727
 728         if (always_checksum && S_ISREG(mode))
 729                 extra_len += SUM_EXTRA_CNT * EXTRA_LEN;
 730
 731         if (file_length > 0xFFFFFFFFu && S_ISREG(mode))
 732                 extra_len += EXTRA_LEN;
 733
 734 #if EXTRA_ROUNDING > 0
 735         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
 736                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
 737 #endif
 738
 739         if (inc_recurse && S_ISDIR(mode)) {
 740                 if (one_file_system) {
 741                         /* Room to save the dir's device for -x */
 742                         extra_len += 2 * EXTRA_LEN;
 743                 }
 744                 flist = dir_flist;
 745         }
 746
 747         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
 748                   + linkname_len;
 749         bp = pool_alloc(flist->file_pool, alloc_len, "recv_file_entry");
 750
 751         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
 752         bp += extra_len;
 753         file = (struct file_struct *)bp;
 754         bp += FILE_STRUCT_LEN;
 755
 756         memcpy(bp, basename, basename_len);
 757         bp += basename_len + linkname_len; /* skip space for symlink too */
 758
 759 #ifdef SUPPORT_HARD_LINKS
 760         if (flags & XMIT_HLINKED)
 761                 file->flags |= FLAG_HLINKED;
 762 #endif
 763         file->modtime = modtime;
 764         file->len32 = (uint32)file_length;
 765         if (file_length > 0xFFFFFFFFu && S_ISREG(mode)) {
 766                 file->flags |= FLAG_LENGTH64;
 767                 OPT_EXTRA(file, 0)->unum = (uint32)(file_length >> 32);
 768         }
 769         file->mode = mode;
 770         if (preserve_uid)
 771                 F_OWNER(file) = uid;
 772         if (preserve_gid)
 773                 F_GROUP(file) = gid;
 774
 775         if (basename != thisname) {
 776                 file->dirname = lastdir;
 777                 F_DEPTH(file) = lastdir_depth + 1;
 778         } else
 779                 F_DEPTH(file) = 1;
 780
 781         if (S_ISDIR(mode)) {
 782                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 783                         F_DEPTH(file)--;
 784                 if (flags & XMIT_TOP_DIR) {
 785                         in_del_hier = recurse;
 786                         del_hier_name_len = F_DEPTH(file) == 0 ? 0 : l1 + l2;
 787                         if (relative_paths && del_hier_name_len > 2
 788                             && lastname[del_hier_name_len-1] == '.'
 789                             && lastname[del_hier_name_len-2] == '/')
 790                                 del_hier_name_len -= 2;
 791                         file->flags |= FLAG_TOP_DIR | FLAG_XFER_DIR;
 792                 } else if (in_del_hier) {
 793                         if (!relative_paths || !del_hier_name_len
 794                          || (l1 >= del_hier_name_len
 795                           && lastname[del_hier_name_len] == '/'))
 796                                 file->flags |= FLAG_XFER_DIR;
 797                         else
 798                                 in_del_hier = 0;
 799                 }
 800         }
 801
 802         if ((preserve_devices && IS_DEVICE(mode))
 803          || (preserve_specials && IS_SPECIAL(mode))) {
 804                 uint32 *devp = F_RDEV_P(file);
 805                 DEV_MAJOR(devp) = major(rdev);
 806                 DEV_MINOR(devp) = minor(rdev);
 807         }
 808
 809 #ifdef SUPPORT_LINKS
 810         if (linkname_len) {
 811                 bp = (char*)file->basename + basename_len;
 812                 if (first_hlink_ndx >= 0) {
 813                         struct file_struct *first = flist->files[first_hlink_ndx];
 814                         memcpy(bp, F_SYMLINK(first), linkname_len);
 815                 } else
 816                         read_sbuf(f, bp, linkname_len - 1);
 817                 if (sanitize_paths)
 818                         sanitize_path(bp, bp, "", lastdir_depth, NULL);
 819         }
 820 #endif
 821
 822 #ifdef SUPPORT_HARD_LINKS
 823         if (preserve_hard_links && flags & XMIT_HLINKED) {
 824                 if (protocol_version >= 30) {
 825                         F_HL_GNUM(file) = flags & XMIT_HLINK_FIRST
 826                                         ? flist->count : first_hlink_ndx;
 827                 } else {
 828                         static int32 cnt = 0;
 829                         struct idev_node *np;
 830                         int64 ino;
 831                         int32 ndx;
 832                         if (protocol_version < 26) {
 833                                 dev = read_int(f);
 834                                 ino = read_int(f);
 835                         } else {
 836                                 if (!(flags & XMIT_SAME_DEV_pre30))
 837                                         dev = read_longint(f);
 838                                 ino = read_longint(f);
 839                         }
 840                         np = idev_node(dev, ino);
 841                         ndx = (int32)(long)np->data - 1;
 842                         if (ndx < 0) {
 843                                 ndx = cnt++;
 844                                 np->data = (void*)(long)cnt;
 845                         }
 846                         F_HL_GNUM(file) = ndx;
 847                 }
 848         }
 849 #endif
 850
 851         if (always_checksum && (S_ISREG(mode) || protocol_version < 28)) {
 852                 if (S_ISREG(mode))
 853                         bp = (char*)F_SUM(file);
 854                 else {
 855                         /* Prior to 28, we get a useless set of nulls. */
 856                         bp = tmp_sum;
 857                 }
 858                 if (first_hlink_ndx >= 0) {
 859                         struct file_struct *first = flist->files[first_hlink_ndx];
 860                         memcpy(bp, F_SUM(first), checksum_len);
 861                 } else
 862                         read_buf(f, bp, checksum_len);
 863         }
 864
 865 #ifdef SUPPORT_ACLS
 866         if (preserve_acls && !S_ISLNK(mode))
 867                 receive_acl(file, f);
 868 #endif
 869
 870         if (S_ISREG(mode) || S_ISLNK(mode))
 871                 stats.total_size += file_length;
 872
 873         return file;
 874 }
 875
 876 /**
 877  * Create a file_struct for a named file by reading its stat()
 878  * information and performing extensive checks against global
 879  * options.
 880  *
 881  * @return the new file, or NULL if there was an error or this file
 882  * should be excluded.
 883  *
 884  * @todo There is a small optimization opportunity here to avoid
 885  * stat()ing the file in some circumstances, which has a certain cost.
 886  * We are called immediately after doing readdir(), and so we may
 887  * already know the d_type of the file.  We could for example avoid
 888  * statting directories if we're not recursing, but this is not a very
 889  * important case.  Some systems may not have d_type.
 890  **/
 891 struct file_struct *make_file(const char *fname, struct file_list *flist,
 892                               STRUCT_STAT *stp, int flags, int filter_level)
 893 {
 894         static char *lastdir;
 895         static int lastdir_len = -1;
 896         struct file_struct *file;
 897         STRUCT_STAT st;
 898         char thisname[MAXPATHLEN];
 899         char linkname[MAXPATHLEN];
 900         int alloc_len, basename_len, linkname_len;
 901         int extra_len = file_extra_cnt * EXTRA_LEN;
 902         const char *basename;
 903         char *bp;
 904
 905         if (strlcpy(thisname, fname, sizeof thisname)
 906             >= sizeof thisname - flist_dir_len) {
 907                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 908                 return NULL;
 909         }
 910         clean_fname(thisname, 0);
 911         if (sanitize_paths)
 912                 sanitize_path(thisname, thisname, "", 0, NULL);
 913
 914         if (stp && S_ISDIR(stp->st_mode)) {
 915                 st = *stp; /* Needed for "symlink/." with --relative. */
 916                 *linkname = '\0'; /* make IBM code checker happy */
 917         } else if (readlink_stat(thisname, &st, linkname) != 0) {
 918                 int save_errno = errno;
 919                 /* See if file is excluded before reporting an error. */
 920                 if (filter_level != NO_FILTERS
 921                  && (is_excluded(thisname, 0, filter_level)
 922                   || is_excluded(thisname, 1, filter_level))) {
 923                         if (ignore_perishable && save_errno != ENOENT)
 924                                 non_perishable_cnt++;
 925                         return NULL;
 926                 }
 927                 if (save_errno == ENOENT) {
 928 #ifdef SUPPORT_LINKS
 929                         /* Avoid "vanished" error if symlink points nowhere. */
 930                         if (copy_links && do_lstat(thisname, &st) == 0
 931                             && S_ISLNK(st.st_mode)) {
 932                                 io_error |= IOERR_GENERAL;
 933                                 rprintf(FERROR, "symlink has no referent: %s\n",
 934                                         full_fname(thisname));
 935                         } else
 936 #endif
 937                         {
 938                                 enum logcode c = am_daemon && protocol_version < 28
 939                                     ? FERROR : FINFO;
 940                                 io_error |= IOERR_VANISHED;
 941                                 rprintf(c, "file has vanished: %s\n",
 942                                         full_fname(thisname));
 943                         }
 944                 } else {
 945                         io_error |= IOERR_GENERAL;
 946                         rsyserr(FERROR, save_errno, "readlink %s failed",
 947                                 full_fname(thisname));
 948                 }
 949                 return NULL;
 950         }
 951
 952         /* backup.c calls us with filter_level set to NO_FILTERS. */
 953         if (filter_level == NO_FILTERS)
 954                 goto skip_filters;
 955
 956         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 957                 rprintf(FINFO, "skipping directory %s\n", thisname);
 958                 return NULL;
 959         }
 960
 961         /* -x only affects directories because we need to avoid recursing
 962          * into a mount-point directory, not to avoid copying a symlinked
 963          * file if -L (or similar) was specified. */
 964         if (one_file_system && st.st_dev != filesystem_dev
 965          && S_ISDIR(st.st_mode)) {
 966                 if (one_file_system > 1) {
 967                         if (verbose > 2) {
 968                                 rprintf(FINFO, "skipping mount-point dir %s\n",
 969                                         thisname);
 970                         }
 971                         return NULL;
 972                 }
 973                 flags |= FLAG_MOUNT_DIR;
 974         }
 975
 976         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level)) {
 977                 if (ignore_perishable)
 978                         non_perishable_cnt++;
 979                 return NULL;
 980         }
 981
 982         if (lp_ignore_nonreadable(module_id)) {
 983 #ifdef SUPPORT_LINKS
 984                 if (!S_ISLNK(st.st_mode))
 985 #endif
 986                         if (access(thisname, R_OK) != 0)
 987                                 return NULL;
 988         }
 989
 990   skip_filters:
 991
 992         /* Only divert a directory in the main transfer. */
 993         if (flist && flist->prev && S_ISDIR(st.st_mode)
 994          && flags & FLAG_DIVERT_DIRS) {
 995                 flist = dir_flist;
 996                 /* Room for parent/sibling/next-child info. */
 997                 extra_len += 3 * EXTRA_LEN;
 998         }
 999
1000         if (verbose > 2) {
1001                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
1002                         who_am_i(), thisname, filter_level);
1003         }
1004
1005         if ((basename = strrchr(thisname, '/')) != NULL) {
1006                 int len = basename++ - thisname;
1007                 if (len != lastdir_len || memcmp(thisname, lastdir, len) != 0) {
1008                         lastdir = new_array(char, len + 1);
1009                         memcpy(lastdir, thisname, len);
1010                         lastdir[len] = '\0';
1011                         lastdir_len = len;
1012                 }
1013         } else
1014                 basename = thisname;
1015         basename_len = strlen(basename) + 1; /* count the '\0' */
1016
1017 #ifdef SUPPORT_LINKS
1018         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
1019 #else
1020         linkname_len = 0;
1021 #endif
1022
1023         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode))
1024                 extra_len += EXTRA_LEN;
1025
1026 #if EXTRA_ROUNDING > 0
1027         if (extra_len & (EXTRA_ROUNDING * EXTRA_LEN))
1028                 extra_len = (extra_len | (EXTRA_ROUNDING * EXTRA_LEN)) + EXTRA_LEN;
1029 #endif
1030
1031         alloc_len = FILE_STRUCT_LEN + extra_len + basename_len
1032                   + linkname_len;
1033         if (flist)
1034                 bp = pool_alloc(flist->file_pool, alloc_len, "make_file");
1035         else {
1036                 if (!(bp = new_array(char, alloc_len)))
1037                         out_of_memory("make_file");
1038         }
1039
1040         memset(bp, 0, extra_len + FILE_STRUCT_LEN);
1041         bp += extra_len;
1042         file = (struct file_struct *)bp;
1043         bp += FILE_STRUCT_LEN;
1044
1045         memcpy(bp, basename, basename_len);
1046         bp += basename_len + linkname_len; /* skip space for symlink too */
1047
1048 #ifdef SUPPORT_HARD_LINKS
1049         if (preserve_hard_links && flist && flist->prev) {
1050                 if (protocol_version >= 28
1051                  ? (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
1052                  : S_ISREG(st.st_mode)) {
1053                         tmp_dev = st.st_dev;
1054                         tmp_ino = st.st_ino;
1055                 } else
1056                         tmp_dev = 0;
1057         }
1058 #endif
1059
1060 #ifdef HAVE_STRUCT_STAT_ST_RDEV
1061         if (IS_DEVICE(st.st_mode) || IS_SPECIAL(st.st_mode)) {
1062                 tmp_rdev = st.st_rdev;
1063                 st.st_size = 0;
1064         }
1065 #endif
1066
1067         file->flags = flags;
1068         file->modtime = st.st_mtime;
1069         file->len32 = (uint32)st.st_size;
1070         if (st.st_size > 0xFFFFFFFFu && S_ISREG(st.st_mode)) {
1071                 file->flags |= FLAG_LENGTH64;
1072                 OPT_EXTRA(file, 0)->unum = (uint32)(st.st_size >> 32);
1073         }
1074         file->mode = st.st_mode;
1075         if (preserve_uid)
1076                 F_OWNER(file) = st.st_uid;
1077         if (preserve_gid)
1078                 F_GROUP(file) = st.st_gid;
1079
1080         if (basename != thisname)
1081                 file->dirname = lastdir;
1082
1083 #ifdef SUPPORT_LINKS
1084         if (linkname_len) {
1085                 bp = (char*)file->basename + basename_len;
1086                 memcpy(bp, linkname, linkname_len);
1087         }
1088 #endif
1089
1090         if (always_checksum && am_sender && S_ISREG(st.st_mode))
1091                 file_checksum(thisname, tmp_sum, st.st_size);
1092
1093         F_ROOTDIR(file) = flist_dir;
1094
1095         /* This code is only used by the receiver when it is building
1096          * a list of files for a delete pass. */
1097         if (keep_dirlinks && linkname_len && flist) {
1098                 STRUCT_STAT st2;
1099                 int save_mode = file->mode;
1100                 file->mode = S_IFDIR; /* Find a directory with our name. */
1101                 if (flist_find(dir_flist, file) >= 0
1102                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
1103                         file->modtime = st2.st_mtime;
1104                         file->len32 = 0;
1105                         file->mode = st2.st_mode;
1106                         if (preserve_uid)
1107                                 F_OWNER(file) = st2.st_uid;
1108                         if (preserve_gid)
1109                                 F_GROUP(file) = st2.st_gid;
1110                 } else
1111                         file->mode = save_mode;
1112         }
1113
1114         if (basename_len == 0+1)
1115                 return NULL;
1116
1117         if (inc_recurse && flist == dir_flist) {
1118                 flist_expand(flist);
1119                 flist->files[flist->count++] = file;
1120         }
1121
1122         return file;
1123 }
1124
1125 /* Only called for temporary file_struct entries created by make_file(). */
1126 void unmake_file(struct file_struct *file)
1127 {
1128         int extra_cnt = file_extra_cnt + LEN64_BUMP(file);
1129 #if EXTRA_ROUNDING > 0
1130         if (extra_cnt & EXTRA_ROUNDING)
1131                 extra_cnt = (extra_cnt | EXTRA_ROUNDING) + 1;
1132 #endif
1133         free(REQ_EXTRA(file, extra_cnt));
1134 }
1135
1136 static struct file_struct *send_file_name(int f, struct file_list *flist,
1137                                           char *fname, STRUCT_STAT *stp,
1138                                           int flags, int filter_flags)
1139 {
1140         struct file_struct *file;
1141 #ifdef SUPPORT_ACLS
1142         statx sx;
1143 #endif
1144
1145         file = make_file(fname, flist, stp, flags, filter_flags);
1146         if (!file)
1147                 return NULL;
1148
1149         if (chmod_modes && !S_ISLNK(file->mode))
1150                 file->mode = tweak_mode(file->mode, chmod_modes);
1151
1152 #ifdef SUPPORT_ACLS
1153         if (preserve_acls && !S_ISLNK(file->mode) && f >= 0) {
1154                 sx.st.st_mode = file->mode;
1155                 sx.acc_acl = sx.def_acl = NULL;
1156                 if (get_acl(fname, &sx) < 0)
1157                         return NULL;
1158         }
1159 #endif
1160
1161         maybe_emit_filelist_progress(flist->count + flist_count_offset);
1162
1163         flist_expand(flist);
1164         flist->files[flist->count++] = file;
1165         if (f >= 0) {
1166                 send_file_entry(f, file, flist->count - 1);
1167 #ifdef SUPPORT_ACLS
1168                 if (preserve_acls && !S_ISLNK(file->mode)) {
1169                         send_acl(&sx, f);
1170                         free_acl(&sx);
1171                 }
1172 #endif
1173         }
1174         return file;
1175 }
1176
1177 static void send_if_directory(int f, struct file_list *flist,
1178                               struct file_struct *file,
1179                               char *fbuf, unsigned int ol,
1180                               int flags)
1181 {
1182         char is_dot_dir = fbuf[ol-1] == '.' && (ol == 1 || fbuf[ol-2] == '/');
1183
1184         if (S_ISDIR(file->mode)
1185             && !(file->flags & FLAG_MOUNT_DIR) && f_name(file, fbuf)) {
1186                 void *save_filters;
1187                 unsigned int len = strlen(fbuf);
1188                 if (len > 1 && fbuf[len-1] == '/')
1189                         fbuf[--len] = '\0';
1190                 if (len >= MAXPATHLEN - 1) {
1191                         io_error |= IOERR_GENERAL;
1192                         rprintf(FERROR, "skipping long-named directory: %s\n",
1193                                 full_fname(fbuf));
1194                         return;
1195                 }
1196                 save_filters = push_local_filters(fbuf, len);
1197                 send_directory(f, flist, -1, fbuf, len, flags);
1198                 pop_local_filters(save_filters);
1199                 fbuf[ol] = '\0';
1200                 if (is_dot_dir)
1201                         fbuf[ol-1] = '.';
1202         }
1203 }
1204
1205 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1206 {
1207         return f_name_cmp(*file1, *file2);
1208 }
1209
1210 /* We take an entire set of sibling dirs from dir_flist (start <= ndx <= end),
1211  * sort them by name, and link them into the tree, setting the appropriate
1212  * parent/child/sibling pointers. */
1213 static void add_dirs_to_tree(int parent_ndx, int start, int end)
1214 {
1215         int i;
1216         int32 *dp = NULL;
1217         int32 *parent_dp = parent_ndx < 0 ? NULL
1218                          : F_DIRNODE_P(dir_flist->files[parent_ndx]);
1219
1220         qsort(dir_flist->files + start, end - start + 1,
1221               sizeof dir_flist->files[0], (int (*)())file_compare);
1222
1223         for (i = start; i <= end; i++) {
1224                 struct file_struct *file = dir_flist->files[i];
1225                 if (!(file->flags & FLAG_XFER_DIR)
1226                  || file->flags & FLAG_MOUNT_DIR)
1227                         continue;
1228                 if (dp)
1229                         DIR_NEXT_SIBLING(dp) = i;
1230                 else if (parent_dp)
1231                         DIR_FIRST_CHILD(parent_dp) = i;
1232                 else
1233                         send_dir_ndx = i;
1234                 dp = F_DIRNODE_P(file);
1235                 DIR_PARENT(dp) = parent_ndx;
1236                 DIR_FIRST_CHILD(dp) = -1;
1237         }
1238         if (dp)
1239                 DIR_NEXT_SIBLING(dp) = -1;
1240 }
1241
1242 /* This function is normally called by the sender, but the receiving side also
1243  * calls it from get_dirlist() with f set to -1 so that we just construct the
1244  * file list in memory without sending it over the wire.  Also, get_dirlist()
1245  * might call this with f set to -2, which also indicates that local filter
1246  * rules should be ignored. */
1247 static void send_directory(int f, struct file_list *flist, int parent_ndx,
1248                            char *fbuf, int len, int flags)
1249 {
1250         struct dirent *di;
1251         unsigned remainder;
1252         char *p;
1253         DIR *d;
1254         int divert_dirs = (flags & FLAG_DIVERT_DIRS) != 0;
1255         int start = divert_dirs ? dir_flist->count : flist->count;
1256         int filter_flags = f == -2 ? SERVER_FILTERS : ALL_FILTERS;
1257
1258         assert(flist != NULL);
1259
1260         if (!(d = opendir(fbuf))) {
1261                 io_error |= IOERR_GENERAL;
1262                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1263                 return;
1264         }
1265
1266         p = fbuf + len;
1267         if (len != 1 || *fbuf != '/')
1268                 *p++ = '/';
1269         *p = '\0';
1270         remainder = MAXPATHLEN - (p - fbuf);
1271
1272         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1273                 char *dname = d_name(di);
1274                 if (dname[0] == '.' && (dname[1] == '\0'
1275                     || (dname[1] == '.' && dname[2] == '\0')))
1276                         continue;
1277                 if (strlcpy(p, dname, remainder) >= remainder) {
1278                         io_error |= IOERR_GENERAL;
1279                         rprintf(FINFO,
1280                                 "cannot send long-named file %s\n",
1281                                 full_fname(fbuf));
1282                         continue;
1283                 }
1284
1285                 send_file_name(f, flist, fbuf, NULL, flags, filter_flags);
1286         }
1287
1288         fbuf[len] = '\0';
1289
1290         if (errno) {
1291                 io_error |= IOERR_GENERAL;
1292                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1293         }
1294
1295         closedir(d);
1296
1297         if (f < 0)
1298                 return;
1299
1300         if (divert_dirs)
1301                 add_dirs_to_tree(parent_ndx, start, dir_flist->count - 1);
1302         else if (recurse) {
1303                 int i, end = flist->count - 1;
1304                 /* send_if_directory() bumps flist->count, so use "end". */
1305                 for (i = start; i <= end; i++)
1306                         send_if_directory(f, flist, flist->files[i], fbuf, len, flags);
1307         }
1308 }
1309
1310 void send_extra_file_list(int f, int at_least)
1311 {
1312         char fbuf[MAXPATHLEN];
1313         struct file_list *flist;
1314         int64 start_write;
1315         int future_cnt, save_io_error = io_error;
1316
1317         if (send_dir_ndx < 0)
1318                 return;
1319
1320         /* Keep sending data until we have the requested number of
1321          * files in the upcoming file-lists. */
1322         if (cur_flist->next) {
1323                 flist = first_flist->prev; /* the newest flist */
1324                 future_cnt = flist->count
1325                            + flist->ndx_start - cur_flist->next->ndx_start;
1326         } else
1327                 future_cnt = 0;
1328         while (future_cnt < at_least) {
1329                 struct file_struct *file = dir_flist->files[send_dir_ndx];
1330                 int32 *dp;
1331                 int dlen;
1332
1333                 f_name(file, fbuf);
1334                 dlen = strlen(fbuf);
1335
1336                 if (F_ROOTDIR(file) != flist_dir) {
1337                         if (!push_flist_dir(F_ROOTDIR(file), -1))
1338                                 exit_cleanup(RERR_FILESELECT);
1339                 }
1340
1341                 flist = flist_new(0, "send_extra_file_list");
1342                 start_write = stats.total_written;
1343
1344                 write_ndx(f, NDX_FLIST_OFFSET - send_dir_ndx);
1345                 change_local_filter_dir(fbuf, dlen, send_dir_depth);
1346                 send_directory(f, flist, send_dir_ndx, fbuf, dlen, FLAG_DIVERT_DIRS | FLAG_XFER_DIR);
1347                 write_byte(f, 0);
1348
1349                 clean_flist(flist, 0, 0);
1350                 file_total += flist->count;
1351                 future_cnt += flist->count;
1352                 stats.flist_size += stats.total_written - start_write;
1353                 stats.num_files += flist->count;
1354                 if (verbose > 3)
1355                         output_flist(flist);
1356
1357                 dp = F_DIRNODE_P(file);
1358                 if (DIR_FIRST_CHILD(dp) >= 0) {
1359                         send_dir_ndx = DIR_FIRST_CHILD(dp);
1360                         send_dir_depth++;
1361                 } else {
1362                         while (DIR_NEXT_SIBLING(dp) < 0) {
1363                                 if ((send_dir_ndx = DIR_PARENT(dp)) < 0) {
1364                                         write_ndx(f, NDX_FLIST_EOF);
1365                                         flist_eof = 1;
1366                                         change_local_filter_dir(NULL, 0, 0);
1367                                         goto finish;
1368                                 }
1369                                 send_dir_depth--;
1370                                 file = dir_flist->files[send_dir_ndx];
1371                                 dp = F_DIRNODE_P(file);
1372                         }
1373                         send_dir_ndx = DIR_NEXT_SIBLING(dp);
1374                 }
1375         }
1376
1377   finish:
1378         if (io_error != save_io_error && !ignore_errors)
1379                 send_msg_int(MSG_IO_ERROR, io_error);
1380 }
1381
1382 struct file_list *send_file_list(int f, int argc, char *argv[])
1383 {
1384         int len;
1385         STRUCT_STAT st;
1386         char *p, *dir;
1387         char lastpath[MAXPATHLEN] = "";
1388         struct file_list *flist;
1389         struct timeval start_tv, end_tv;
1390         int64 start_write;
1391         int use_ff_fd = 0;
1392         int flags, disable_buffering;
1393
1394         rprintf(FLOG, "building file list\n");
1395         if (show_filelist_p())
1396                 start_filelist_progress("building file list");
1397         else if (inc_recurse && verbose && !am_server)
1398                 rprintf(FCLIENT, "sending incremental file list\n");
1399
1400         start_write = stats.total_written;
1401         gettimeofday(&start_tv, NULL);
1402
1403 #ifdef SUPPORT_HARD_LINKS
1404         if (preserve_hard_links && protocol_version >= 30 && !cur_flist)
1405                 init_hard_links();
1406 #endif
1407
1408         flist = cur_flist = flist_new(0, "send_file_list");
1409         if (inc_recurse) {
1410                 dir_flist = flist_new(FLIST_TEMP, "send_file_list");
1411                 flags = FLAG_DIVERT_DIRS;
1412         } else {
1413                 dir_flist = cur_flist;
1414                 flags = 0;
1415         }
1416
1417         disable_buffering = io_start_buffering_out(f);
1418         if (filesfrom_fd >= 0) {
1419                 if (argv[0] && !push_dir(argv[0], 0)) {
1420                         rsyserr(FERROR, errno, "push_dir %s failed",
1421                                 full_fname(argv[0]));
1422                         exit_cleanup(RERR_FILESELECT);
1423                 }
1424                 use_ff_fd = 1;
1425         }
1426
1427         while (1) {
1428                 char fbuf[MAXPATHLEN];
1429                 char *fn;
1430                 int is_dot_dir;
1431
1432                 if (use_ff_fd) {
1433                         if (read_filesfrom_line(filesfrom_fd, fbuf) == 0)
1434                                 break;
1435                         sanitize_path(fbuf, fbuf, "", 0, NULL);
1436                 } else {
1437                         if (argc-- == 0)
1438                                 break;
1439                         strlcpy(fbuf, *argv++, MAXPATHLEN);
1440                         if (sanitize_paths)
1441                                 sanitize_path(fbuf, fbuf, "", 0, NULL);
1442                 }
1443
1444                 len = strlen(fbuf);
1445                 if (relative_paths) {
1446                         /* We clean up fbuf below. */
1447                         is_dot_dir = 0;
1448                 } else if (!len || fbuf[len - 1] == '/') {
1449                         if (len == 2 && fbuf[0] == '.') {
1450                                 /* Turn "./" into just "." rather than "./." */
1451                                 fbuf[1] = '\0';
1452                         } else {
1453                                 if (len + 1 >= MAXPATHLEN)
1454                                         overflow_exit("send_file_list");
1455                                 fbuf[len++] = '.';
1456                                 fbuf[len] = '\0';
1457                         }
1458                         is_dot_dir = 1;
1459                 } else if (len > 1 && fbuf[len-1] == '.' && fbuf[len-2] == '.'
1460                     && (len == 2 || fbuf[len-3] == '/')) {
1461                         if (len + 2 >= MAXPATHLEN)
1462                                 overflow_exit("send_file_list");
1463                         fbuf[len++] = '/';
1464                         fbuf[len++] = '.';
1465                         fbuf[len] = '\0';
1466                         is_dot_dir = 1;
1467                 } else {
1468                         is_dot_dir = fbuf[len-1] == '.'
1469                                    && (len == 1 || fbuf[len-2] == '/');
1470                 }
1471
1472                 if (link_stat(fbuf, &st, copy_dirlinks) != 0) {
1473                         io_error |= IOERR_GENERAL;
1474                         rsyserr(FERROR, errno, "link_stat %s failed",
1475                                 full_fname(fbuf));
1476                         continue;
1477                 }
1478
1479                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1480                         rprintf(FINFO, "skipping directory %s\n", fbuf);
1481                         continue;
1482                 }
1483
1484                 dir = NULL;
1485
1486                 if (!relative_paths) {
1487                         p = strrchr(fbuf, '/');
1488                         if (p) {
1489                                 *p = '\0';
1490                                 if (p == fbuf)
1491                                         dir = "/";
1492                                 else
1493                                         dir = fbuf;
1494                                 len -= p - fbuf + 1;
1495                                 fn = p + 1;
1496                         } else
1497                                 fn = fbuf;
1498                 } else {
1499                         if ((p = strstr(fbuf, "/./")) != NULL) {
1500                                 *p = '\0';
1501                                 if (p == fbuf)
1502                                         dir = "/";
1503                                 else
1504                                         dir = fbuf;
1505                                 len -= p - fbuf + 3;
1506                                 fn = p + 3;
1507                         } else
1508                                 fn = fbuf;
1509                         /* Get rid of trailing "/" and "/.". */
1510                         while (len) {
1511                                 if (fn[len - 1] == '/') {
1512                                         is_dot_dir = 1;
1513                                         if (!--len && !dir) {
1514                                                 len++;
1515                                                 break;
1516                                         }
1517                                 }
1518                                 else if (len >= 2 && fn[len - 1] == '.'
1519                                                   && fn[len - 2] == '/') {
1520                                         is_dot_dir = 1;
1521                                         if (!(len -= 2) && !dir) {
1522                                                 len++;
1523                                                 break;
1524                                         }
1525                                 } else
1526                                         break;
1527                         }
1528                         if (len == 1 && fn[0] == '/')
1529                                 fn[len++] = '.';
1530                         fn[len] = '\0';
1531                         /* Reject a ".." dir in the active part of the path. */
1532                         for (p = fn; (p = strstr(p, "..")) != NULL; p += 2) {
1533                                 if ((p[2] == '/' || p[2] == '\0')
1534                                  && (p == fn || p[-1] == '/')) {
1535                                         rprintf(FERROR,
1536                                             "found \"..\" dir in relative path: %s\n",
1537                                             fbuf);
1538                                         exit_cleanup(RERR_SYNTAX);
1539                                 }
1540                         }
1541                 }
1542
1543                 if (!*fn) {
1544                         len = 1;
1545                         fn = ".";
1546                 }
1547
1548                 if (dir && *dir) {
1549                         static const char *lastdir;
1550                         static int lastdir_len = -1;
1551                         int len = strlen(dir);
1552
1553                         if (len != lastdir_len || memcmp(lastdir, dir, len) != 0) {
1554                                 if (!push_flist_dir(strdup(dir), len))
1555                                         goto push_error;
1556                                 lastdir = flist_dir;
1557                                 lastdir_len = flist_dir_len;
1558                         } else if (!push_flist_dir(lastdir, lastdir_len)) {
1559                           push_error:
1560                                 io_error |= IOERR_GENERAL;
1561                                 rsyserr(FERROR, errno, "push_dir %s failed",
1562                                         full_fname(dir));
1563                                 continue;
1564                         }
1565                 }
1566
1567                 if (fn != fbuf)
1568                         memmove(fbuf, fn, len + 1);
1569
1570                 if (implied_dirs && (p=strrchr(fbuf,'/')) && p != fbuf) {
1571                         /* Send the implied directories at the start of the
1572                          * source spec, so we get their permissions right. */
1573                         char *lp = lastpath, *slash = fbuf;
1574                         *p = '\0';
1575                         /* Skip any initial directories in our path that we
1576                          * have in common with lastpath. */
1577                         for (fn = fbuf; *fn && *lp == *fn; lp++, fn++) {
1578                                 if (*fn == '/')
1579                                         slash = fn;
1580                         }
1581                         *p = '/';
1582                         if (fn != p || (*lp && *lp != '/')) {
1583                                 int save_copy_links = copy_links;
1584                                 int save_xfer_dirs = xfer_dirs;
1585                                 int dir_flags = inc_recurse ? FLAG_DIVERT_DIRS : 0;
1586                                 copy_links |= copy_unsafe_links;
1587                                 xfer_dirs = 1;
1588                                 while ((slash = strchr(slash+1, '/')) != 0) {
1589                                         *slash = '\0';
1590                                         send_file_name(f, flist, fbuf, NULL,
1591                                                        dir_flags, ALL_FILTERS);
1592                                         *slash = '/';
1593                                 }
1594                                 copy_links = save_copy_links;
1595                                 xfer_dirs = save_xfer_dirs;
1596                                 *p = '\0';
1597                                 strlcpy(lastpath, fbuf, sizeof lastpath);
1598                                 *p = '/';
1599                         }
1600                 }
1601
1602                 if (one_file_system)
1603                         filesystem_dev = st.st_dev;
1604
1605                 if (recurse || (xfer_dirs && is_dot_dir)) {
1606                         struct file_struct *file;
1607                         int top_flags = FLAG_TOP_DIR | FLAG_XFER_DIR
1608                                       | (is_dot_dir ? 0 : flags)
1609                                       | (inc_recurse ? FLAG_DIVERT_DIRS : 0);
1610                         file = send_file_name(f, flist, fbuf, &st,
1611                                               top_flags, ALL_FILTERS);
1612                         if (file && !inc_recurse)
1613                                 send_if_directory(f, flist, file, fbuf, len, flags);
1614                 } else
1615                         send_file_name(f, flist, fbuf, &st, flags, ALL_FILTERS);
1616         }
1617
1618         gettimeofday(&end_tv, NULL);
1619         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1620                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1621         if (stats.flist_buildtime == 0)
1622                 stats.flist_buildtime = 1;
1623         start_tv = end_tv;
1624
1625         write_byte(f, 0); /* Indicate end of file list */
1626
1627 #ifdef SUPPORT_HARD_LINKS
1628         if (preserve_hard_links && protocol_version >= 30 && !inc_recurse)
1629                 idev_destroy();
1630 #endif
1631
1632         if (show_filelist_p())
1633                 finish_filelist_progress(flist);
1634
1635         gettimeofday(&end_tv, NULL);
1636         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1637                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1638
1639         /* Sort the list without removing any duplicates in non-incremental
1640          * mode.  This allows the receiving side to ask for whatever name it
1641          * kept.  For incremental mode, the sender also removes duplicates
1642          * in this initial file-list so that it avoids re-sending duplicated
1643          * directories. */
1644         clean_flist(flist, 0, inc_recurse);
1645         file_total += flist->count;
1646
1647         if (!numeric_ids && !inc_recurse)
1648                 send_uid_list(f);
1649
1650         /* send the io_error flag */
1651         if (protocol_version < 30)
1652                 write_int(f, ignore_errors ? 0 : io_error);
1653         else if (io_error && !ignore_errors)
1654                 send_msg_int(MSG_IO_ERROR, io_error);
1655
1656         if (disable_buffering)
1657                 io_end_buffering_out();
1658
1659         stats.flist_size = stats.total_written - start_write;
1660         stats.num_files = flist->count;
1661
1662         if (verbose > 3)
1663                 output_flist(flist);
1664
1665         if (verbose > 2)
1666                 rprintf(FINFO, "send_file_list done\n");
1667
1668         if (inc_recurse) {
1669                 add_dirs_to_tree(-1, 0, dir_flist->count - 1);
1670                 if (file_total == 1) {
1671                         /* If we're creating incremental file-lists and there
1672                          * was just 1 item in the first file-list, send 1 more
1673                          * file-list to check if this is a 1-file xfer. */
1674                         if (send_dir_ndx < 0)
1675                                 write_ndx(f, NDX_DONE);
1676                         else
1677                                 send_extra_file_list(f, 1);
1678                 }
1679         }
1680
1681         return flist;
1682 }
1683
1684 struct file_list *recv_file_list(int f)
1685 {
1686         struct file_list *flist;
1687         int dstart, flags;
1688         int64 start_read;
1689
1690         if (!first_flist)
1691                 rprintf(FLOG, "receiving file list\n");
1692         if (show_filelist_p())
1693                 start_filelist_progress("receiving file list");
1694         else if (inc_recurse && verbose && !am_server && !first_flist)
1695                 rprintf(FCLIENT, "receiving incremental file list\n");
1696
1697         start_read = stats.total_read;
1698
1699         flist = flist_new(0, "recv_file_list");
1700
1701 #ifdef SUPPORT_HARD_LINKS
1702         if (preserve_hard_links && protocol_version < 30)
1703                 init_hard_links();
1704 #endif
1705
1706         if (inc_recurse) {
1707                 if (flist->ndx_start == 0)
1708                         dir_flist = flist_new(FLIST_TEMP, "recv_file_list");
1709                 dstart = dir_flist->count;
1710         } else {
1711                 dir_flist = flist;
1712                 dstart = 0;
1713         }
1714
1715         while ((flags = read_byte(f)) != 0) {
1716                 struct file_struct *file;
1717
1718                 flist_expand(flist);
1719
1720                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1721                         flags |= read_byte(f) << 8;
1722                 file = recv_file_entry(flist, flags, f);
1723
1724                 if (inc_recurse && S_ISDIR(file->mode)) {
1725                         flist_expand(dir_flist);
1726                         dir_flist->files[dir_flist->count++] = file;
1727                 }
1728
1729                 flist->files[flist->count++] = file;
1730
1731                 maybe_emit_filelist_progress(flist->count);
1732
1733                 if (verbose > 2) {
1734                         rprintf(FINFO, "recv_file_name(%s)\n",
1735                                 f_name(file, NULL));
1736                 }
1737         }
1738         file_total += flist->count;
1739
1740         if (verbose > 2)
1741                 rprintf(FINFO, "received %d names\n", flist->count);
1742
1743         if (show_filelist_p())
1744                 finish_filelist_progress(flist);
1745
1746         clean_flist(flist, relative_paths, 1);
1747
1748         if (inc_recurse) {
1749                 qsort(dir_flist->files + dstart, dir_flist->count - dstart,
1750                       sizeof dir_flist->files[0], (int (*)())file_compare);
1751         } else if (f >= 0)
1752                 recv_uid_list(f, flist);
1753
1754         if (protocol_version < 30) {
1755                 /* Recv the io_error flag */
1756                 if (ignore_errors)
1757                         read_int(f);
1758                 else
1759                         io_error |= read_int(f);
1760         }
1761
1762         if (verbose > 3)
1763                 output_flist(flist);
1764
1765         if (list_only) {
1766                 int i;
1767                 for (i = 0; i < flist->count; i++)
1768                         list_file_entry(flist->files[i]);
1769         }
1770
1771         if (verbose > 2)
1772                 rprintf(FINFO, "recv_file_list done\n");
1773
1774         stats.flist_size += stats.total_read - start_read;
1775         stats.num_files += flist->count;
1776
1777         return flist;
1778 }
1779
1780 /* This is only used once by the receiver if the very first file-list
1781  * has exactly one item in it. */
1782 void recv_additional_file_list(int f)
1783 {
1784         struct file_list *flist;
1785         int ndx = read_ndx(f);
1786         if (ndx == NDX_DONE) {
1787                 flist_eof = 1;
1788                 change_local_filter_dir(NULL, 0, 0);
1789         } else {
1790                 ndx = NDX_FLIST_OFFSET - ndx;
1791                 if (ndx < 0 || ndx >= dir_flist->count) {
1792                         ndx = NDX_FLIST_OFFSET - ndx;
1793                         rprintf(FERROR,
1794                                 "Invalid dir index: %d (%d - %d)\n",
1795                                 ndx, NDX_FLIST_OFFSET,
1796                                 NDX_FLIST_OFFSET - dir_flist->count);
1797                         exit_cleanup(RERR_PROTOCOL);
1798                 }
1799                 flist = recv_file_list(f);
1800                 flist->parent_ndx = ndx;
1801         }
1802 }
1803
1804 /* Search for an identically-named item in the file list.  Note that the
1805  * items must agree in their directory-ness, or no match is returned. */
1806 int flist_find(struct file_list *flist, struct file_struct *f)
1807 {
1808         int low = flist->low, high = flist->high;
1809         int diff, mid, mid_up;
1810
1811         while (low <= high) {
1812                 mid = (low + high) / 2;
1813                 if (F_IS_ACTIVE(flist->files[mid]))
1814                         mid_up = mid;
1815                 else {
1816                         /* Scan for the next non-empty entry using the cached
1817                          * distance values.  If the value isn't fully up-to-
1818                          * date, update it. */
1819                         mid_up = mid + F_DEPTH(flist->files[mid]);
1820                         if (!F_IS_ACTIVE(flist->files[mid_up])) {
1821                                 do {
1822                                     mid_up += F_DEPTH(flist->files[mid_up]);
1823                                 } while (!F_IS_ACTIVE(flist->files[mid_up]));
1824                                 F_DEPTH(flist->files[mid]) = mid_up - mid;
1825                         }
1826                         if (mid_up > high) {
1827                                 /* If there's nothing left above us, set high to
1828                                  * a non-empty entry below us and continue. */
1829                                 high = mid - (int)flist->files[mid]->len32;
1830                                 if (!F_IS_ACTIVE(flist->files[high])) {
1831                                         do {
1832                                             high -= (int)flist->files[high]->len32;
1833                                         } while (!F_IS_ACTIVE(flist->files[high]));
1834                                         flist->files[mid]->len32 = mid - high;
1835                                 }
1836                                 continue;
1837                         }
1838                 }
1839                 diff = f_name_cmp(flist->files[mid_up], f);
1840                 if (diff == 0) {
1841                         if (protocol_version < 29
1842                             && S_ISDIR(flist->files[mid_up]->mode)
1843                             != S_ISDIR(f->mode))
1844                                 return -1;
1845                         return mid_up;
1846                 }
1847                 if (diff < 0)
1848                         low = mid_up + 1;
1849                 else
1850                         high = mid - 1;
1851         }
1852         return -1;
1853 }
1854
1855 /*
1856  * Free up any resources a file_struct has allocated
1857  * and clear the file.
1858  */
1859 void clear_file(struct file_struct *file)
1860 {
1861         /* The +1 zeros out the first char of the basename. */
1862         memset(file, 0, FILE_STRUCT_LEN + 1);
1863         /* In an empty entry, F_DEPTH() is an offset to the next non-empty
1864          * entry.  Likewise for len32 in the opposite direction.  We assume
1865          * that we're alone for now since flist_find() will adjust the counts
1866          * it runs into that aren't up-to-date. */
1867         file->len32 = F_DEPTH(file) = 1;
1868 }
1869
1870 /* Allocate a new file list. */
1871 struct file_list *flist_new(int flags, char *msg)
1872 {
1873         struct file_list *flist;
1874
1875         flist = new(struct file_list);
1876         if (!flist)
1877                 out_of_memory(msg);
1878
1879         memset(flist, 0, sizeof flist[0]);
1880
1881         if (!(flags & FLIST_TEMP)) {
1882                 if (first_flist) {
1883                         flist->ndx_start = first_flist->prev->ndx_start
1884                                          + first_flist->prev->count;
1885                 }
1886                 /* This is a doubly linked list with prev looping back to
1887                  * the end of the list, but the last next pointer is NULL. */
1888                 if (!first_flist)
1889                         first_flist = cur_flist = flist->prev = flist;
1890                 else {
1891                         flist->prev = first_flist->prev;
1892                         flist->prev->next = first_flist->prev = flist;
1893                 }
1894                 flist_cnt++;
1895         }
1896
1897         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0, out_of_memory, POOL_INTERN)))
1898                 out_of_memory(msg);
1899
1900         return flist;
1901 }
1902
1903 /* Free up all elements in a flist. */
1904 void flist_free(struct file_list *flist)
1905 {
1906         if (!flist->prev)
1907                 ; /* Was FLIST_TEMP dir-list. */
1908         else if (flist == flist->prev) {
1909                 first_flist = cur_flist = NULL;
1910                 file_total = 0;
1911                 flist_cnt = 0;
1912         } else {
1913                 if (flist == cur_flist)
1914                         cur_flist = flist->next;
1915                 if (flist == first_flist)
1916                         first_flist = first_flist->next;
1917                 else {
1918                         flist->prev->next = flist->next;
1919                         if (!flist->next)
1920                                 flist->next = first_flist;
1921                 }
1922                 flist->next->prev = flist->prev;
1923                 file_total -= flist->count;
1924                 flist_cnt--;
1925         }
1926
1927         pool_destroy(flist->file_pool);
1928         free(flist->files);
1929         free(flist);
1930 }
1931
1932 /*
1933  * This routine ensures we don't have any duplicate names in our file list.
1934  * duplicate names can cause corruption because of the pipelining
1935  */
1936 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1937 {
1938         char fbuf[MAXPATHLEN];
1939         int i, prev_i = 0;
1940
1941         if (!flist)
1942                 return;
1943         if (flist->count == 0) {
1944                 flist->high = -1;
1945                 return;
1946         }
1947
1948         qsort(flist->files, flist->count,
1949             sizeof flist->files[0], (int (*)())file_compare);
1950
1951         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1952                 if (F_IS_ACTIVE(flist->files[i])) {
1953                         prev_i = i;
1954                         break;
1955                 }
1956         }
1957         flist->low = prev_i;
1958         while (++i < flist->count) {
1959                 int j;
1960                 struct file_struct *file = flist->files[i];
1961
1962                 if (!F_IS_ACTIVE(file))
1963                         continue;
1964                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1965                         j = prev_i;
1966                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1967                         int save_mode = file->mode;
1968                         /* Make sure that this directory doesn't duplicate a
1969                          * non-directory earlier in the list. */
1970                         flist->high = prev_i;
1971                         file->mode = S_IFREG;
1972                         j = flist_find(flist, file);
1973                         file->mode = save_mode;
1974                 } else
1975                         j = -1;
1976                 if (j >= 0) {
1977                         struct file_struct *fp = flist->files[j];
1978                         int keep, drop;
1979                         /* If one is a dir and the other is not, we want to
1980                          * keep the dir because it might have contents in the
1981                          * list. */
1982                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1983                                 if (S_ISDIR(file->mode))
1984                                         keep = i, drop = j;
1985                                 else
1986                                         keep = j, drop = i;
1987                         } else if (protocol_version < 27)
1988                                 keep = j, drop = i;
1989                         else
1990                                 keep = i, drop = j;
1991                         if (verbose > 1 && !am_server) {
1992                                 rprintf(FINFO,
1993                                         "removing duplicate name %s from file list (%d)\n",
1994                                         f_name(file, fbuf), drop);
1995                         }
1996                         /* Make sure we don't lose track of a user-specified
1997                          * top directory. */
1998                         flist->files[keep]->flags |= flist->files[drop]->flags
1999                                                    & (FLAG_TOP_DIR|FLAG_XFER_DIR);
2000
2001                         clear_file(flist->files[drop]);
2002
2003                         if (keep == i) {
2004                                 if (flist->low == drop) {
2005                                         for (j = drop + 1;
2006                                              j < i && !F_IS_ACTIVE(flist->files[j]);
2007                                              j++) {}
2008                                         flist->low = j;
2009                                 }
2010                                 prev_i = i;
2011                         }
2012                 } else
2013                         prev_i = i;
2014         }
2015         flist->high = no_dups ? prev_i : flist->count - 1;
2016
2017         if (strip_root) {
2018                 /* We need to strip off the leading slashes for relative
2019                  * paths, but this must be done _after_ the sorting phase. */
2020                 for (i = flist->low; i <= flist->high; i++) {
2021                         struct file_struct *file = flist->files[i];
2022
2023                         if (!file->dirname)
2024                                 continue;
2025                         while (*file->dirname == '/')
2026                                 file->dirname++;
2027                         if (!*file->dirname)
2028                                 file->dirname = NULL;
2029                 }
2030         }
2031
2032         if (prune_empty_dirs && no_dups) {
2033                 int j, prev_depth = 0;
2034
2035                 prev_i = 0; /* It's OK that this isn't really true. */
2036
2037                 for (i = flist->low; i <= flist->high; i++) {
2038                         struct file_struct *fp, *file = flist->files[i];
2039
2040                         /* This temporarily abuses the F_DEPTH() value for a
2041                          * directory that is in a chain that might get pruned.
2042                          * We restore the old value if it gets a reprieve. */
2043                         if (S_ISDIR(file->mode) && F_DEPTH(file)) {
2044                                 /* Dump empty dirs when coming back down. */
2045                                 for (j = prev_depth; j >= F_DEPTH(file); j--) {
2046                                         fp = flist->files[prev_i];
2047                                         if (F_DEPTH(fp) >= 0)
2048                                                 break;
2049                                         prev_i = -F_DEPTH(fp)-1;
2050                                         clear_file(fp);
2051                                 }
2052                                 prev_depth = F_DEPTH(file);
2053                                 if (is_excluded(f_name(file, fbuf), 1,
2054                                                        ALL_FILTERS)) {
2055                                         /* Keep dirs through this dir. */
2056                                         for (j = prev_depth-1; ; j--) {
2057                                                 fp = flist->files[prev_i];
2058                                                 if (F_DEPTH(fp) >= 0)
2059                                                         break;
2060                                                 prev_i = -F_DEPTH(fp)-1;
2061                                                 F_DEPTH(fp) = j;
2062                                         }
2063                                 } else
2064                                         F_DEPTH(file) = -prev_i-1;
2065                                 prev_i = i;
2066                         } else {
2067                                 /* Keep dirs through this non-dir. */
2068                                 for (j = prev_depth; ; j--) {
2069                                         fp = flist->files[prev_i];
2070                                         if (F_DEPTH(fp) >= 0)
2071                                                 break;
2072                                         prev_i = -F_DEPTH(fp)-1;
2073                                         F_DEPTH(fp) = j;
2074                                 }
2075                         }
2076                 }
2077                 /* Dump all remaining empty dirs. */
2078                 while (1) {
2079                         struct file_struct *fp = flist->files[prev_i];
2080                         if (F_DEPTH(fp) >= 0)
2081                                 break;
2082                         prev_i = -F_DEPTH(fp)-1;
2083                         clear_file(fp);
2084                 }
2085
2086                 for (i = flist->low; i <= flist->high; i++) {
2087                         if (F_IS_ACTIVE(flist->files[i]))
2088                                 break;
2089                 }
2090                 flist->low = i;
2091                 for (i = flist->high; i >= flist->low; i--) {
2092                         if (F_IS_ACTIVE(flist->files[i]))
2093                                 break;
2094                 }
2095                 flist->high = i;
2096         }
2097 }
2098
2099 static void output_flist(struct file_list *flist)
2100 {
2101         char uidbuf[16], gidbuf[16], depthbuf[16];
2102         struct file_struct *file;
2103         const char *root, *dir, *slash, *name, *trail;
2104         const char *who = who_am_i();
2105         int i;
2106
2107         rprintf(FINFO, "[%s] flist start=%d, count=%d, low=%d, high=%d\n",
2108                 who, flist->ndx_start, flist->count, flist->low, flist->high);
2109         for (i = 0; i < flist->count; i++) {
2110                 file = flist->files[i];
2111                 if ((am_root || am_sender) && preserve_uid) {
2112                         snprintf(uidbuf, sizeof uidbuf, " uid=%ld",
2113                                  (long)F_UID(file));
2114                 } else
2115                         *uidbuf = '\0';
2116                 if (preserve_gid && F_GID(file) != GID_NONE) {
2117                         snprintf(gidbuf, sizeof gidbuf, " gid=%ld",
2118                                  (long)F_GID(file));
2119                 } else
2120                         *gidbuf = '\0';
2121                 if (!am_sender)
2122                         snprintf(depthbuf, sizeof depthbuf, "%d", F_DEPTH(file));
2123                 if (F_IS_ACTIVE(file)) {
2124                         root = am_sender ? NS(F_ROOTDIR(file)) : depthbuf;
2125                         if ((dir = file->dirname) == NULL)
2126                                 dir = slash = "";
2127                         else
2128                                 slash = "/";
2129                         name = file->basename;
2130                         trail = S_ISDIR(file->mode) ? "/" : "";
2131                 } else
2132                         root = dir = slash = name = trail = "";
2133                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
2134                         who, i, root, dir, slash, name, trail, (int)file->mode,
2135                         (double)F_LENGTH(file), uidbuf, gidbuf, file->flags);
2136         }
2137 }
2138
2139 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
2140 enum fnc_type { t_PATH, t_ITEM };
2141
2142 /* Compare the names of two file_struct entities, similar to how strcmp()
2143  * would do if it were operating on the joined strings.
2144  *
2145  * Some differences beginning with protocol_version 29: (1) directory names
2146  * are compared with an assumed trailing slash so that they compare in a
2147  * way that would cause them to sort immediately prior to any content they
2148  * may have; (2) a directory of any name compares after a non-directory of
2149  * any name at the same depth; (3) a directory with name "." compares prior
2150  * to anything else.  These changes mean that a directory and a non-dir
2151  * with the same name will not compare as equal (protocol_version >= 29).
2152  *
2153  * The dirname component can be an empty string, but the basename component
2154  * cannot (and never is in the current codebase).  The basename component
2155  * may be NULL (for a removed item), in which case it is considered to be
2156  * after any existing item. */
2157 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
2158 {
2159         int dif;
2160         const uchar *c1, *c2;
2161         enum fnc_state state1, state2;
2162         enum fnc_type type1, type2;
2163         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
2164
2165         if (!f1 || !F_IS_ACTIVE(f1)) {
2166                 if (!f2 || !F_IS_ACTIVE(f2))
2167                         return 0;
2168                 return -1;
2169         }
2170         if (!f2 || !F_IS_ACTIVE(f2))
2171                 return 1;
2172
2173         c1 = (uchar*)f1->dirname;
2174         c2 = (uchar*)f2->dirname;
2175         if (c1 == c2)
2176                 c1 = c2 = NULL;
2177         if (!c1) {
2178                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2179                 c1 = (const uchar*)f1->basename;
2180                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2181                         type1 = t_ITEM;
2182                         state1 = s_TRAILING;
2183                         c1 = (uchar*)"";
2184                 } else
2185                         state1 = s_BASE;
2186         } else {
2187                 type1 = t_path;
2188                 state1 = s_DIR;
2189         }
2190         if (!c2) {
2191                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2192                 c2 = (const uchar*)f2->basename;
2193                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2194                         type2 = t_ITEM;
2195                         state2 = s_TRAILING;
2196                         c2 = (uchar*)"";
2197                 } else
2198                         state2 = s_BASE;
2199         } else {
2200                 type2 = t_path;
2201                 state2 = s_DIR;
2202         }
2203
2204         if (type1 != type2)
2205                 return type1 == t_PATH ? 1 : -1;
2206
2207         do {
2208                 if (!*c1) {
2209                         switch (state1) {
2210                         case s_DIR:
2211                                 state1 = s_SLASH;
2212                                 c1 = (uchar*)"/";
2213                                 break;
2214                         case s_SLASH:
2215                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
2216                                 c1 = (const uchar*)f1->basename;
2217                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
2218                                         type1 = t_ITEM;
2219                                         state1 = s_TRAILING;
2220                                         c1 = (uchar*)"";
2221                                 } else
2222                                         state1 = s_BASE;
2223                                 break;
2224                         case s_BASE:
2225                                 state1 = s_TRAILING;
2226                                 if (type1 == t_PATH) {
2227                                         c1 = (uchar*)"/";
2228                                         break;
2229                                 }
2230                                 /* FALL THROUGH */
2231                         case s_TRAILING:
2232                                 type1 = t_ITEM;
2233                                 break;
2234                         }
2235                         if (*c2 && type1 != type2)
2236                                 return type1 == t_PATH ? 1 : -1;
2237                 }
2238                 if (!*c2) {
2239                         switch (state2) {
2240                         case s_DIR:
2241                                 state2 = s_SLASH;
2242                                 c2 = (uchar*)"/";
2243                                 break;
2244                         case s_SLASH:
2245                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
2246                                 c2 = (const uchar*)f2->basename;
2247                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
2248                                         type2 = t_ITEM;
2249                                         state2 = s_TRAILING;
2250                                         c2 = (uchar*)"";
2251                                 } else
2252                                         state2 = s_BASE;
2253                                 break;
2254                         case s_BASE:
2255                                 state2 = s_TRAILING;
2256                                 if (type2 == t_PATH) {
2257                                         c2 = (uchar*)"/";
2258                                         break;
2259                                 }
2260                                 /* FALL THROUGH */
2261                         case s_TRAILING:
2262                                 if (!*c1)
2263                                         return 0;
2264                                 type2 = t_ITEM;
2265                                 break;
2266                         }
2267                         if (type1 != type2)
2268                                 return type1 == t_PATH ? 1 : -1;
2269                 }
2270         } while ((dif = (int)*c1++ - (int)*c2++) == 0);
2271
2272         return dif;
2273 }
2274
2275 char *f_name_buf(void)
2276 {
2277         static char names[5][MAXPATHLEN];
2278         static unsigned int n;
2279
2280         n = (n + 1) % (sizeof names / sizeof names[0]);
2281
2282         return names[n];
2283 }
2284
2285 /* Return a copy of the full filename of a flist entry, using the indicated
2286  * buffer or one of 5 static buffers if fbuf is NULL.  No size-checking is
2287  * done because we checked the size when creating the file_struct entry.
2288  */
2289 char *f_name(struct file_struct *f, char *fbuf)
2290 {
2291         if (!f || !F_IS_ACTIVE(f))
2292                 return NULL;
2293
2294         if (!fbuf)
2295                 fbuf = f_name_buf();
2296
2297         if (f->dirname) {
2298                 int len = strlen(f->dirname);
2299                 memcpy(fbuf, f->dirname, len);
2300                 fbuf[len] = '/';
2301                 strlcpy(fbuf + len + 1, f->basename, MAXPATHLEN - (len + 1));
2302         } else
2303                 strlcpy(fbuf, f->basename, MAXPATHLEN);
2304
2305         return fbuf;
2306 }
2307
2308 /* Do a non-recursive scan of the named directory, possibly ignoring all
2309  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
2310  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
2311  * buffer (the functions we call will append names onto the end, but the old
2312  * dir value will be restored on exit). */
2313 struct file_list *get_dirlist(char *dirname, int dlen, int ignore_filter_rules)
2314 {
2315         struct file_list *dirlist;
2316         char dirbuf[MAXPATHLEN];
2317         int save_recurse = recurse;
2318         int save_xfer_dirs = xfer_dirs;
2319
2320         if (dlen < 0) {
2321                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
2322                 if (dlen >= MAXPATHLEN)
2323                         return NULL;
2324                 dirname = dirbuf;
2325         }
2326
2327         dirlist = flist_new(FLIST_TEMP, "get_dirlist");
2328
2329         recurse = 0;
2330         xfer_dirs = 1;
2331         send_directory(ignore_filter_rules ? -2 : -1, dirlist, -1, dirname, dlen, 0);
2332         xfer_dirs = save_xfer_dirs;
2333         recurse = save_recurse;
2334         if (do_progress)
2335                 flist_count_offset += dirlist->count;
2336
2337         clean_flist(dirlist, 0, 0);
2338
2339         if (verbose > 3)
2340                 output_flist(dirlist);
2341
2342         return dirlist;
2343 }