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