flist.c

   1 /*
   2    Copyright (C) Andrew Tridgell 1996
   3    Copyright (C) Paul Mackerras 1996
   4    Copyright (C) 2001, 2002 by Martin Pool <mbp@samba.org>
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /** @file flist.c
  22  * Generate and receive file lists
  23  *
  24  * @sa http://lists.samba.org/pipermail/rsync/2000-June/002351.html
  25  *
  26  **/
  27
  28 #include "rsync.h"
  29
  30 extern int verbose;
  31 extern int dry_run;
  32 extern int list_only;
  33 extern int am_root;
  34 extern int am_server;
  35 extern int am_daemon;
  36 extern int am_sender;
  37 extern int do_progress;
  38 extern int always_checksum;
  39 extern int module_id;
  40 extern int ignore_errors;
  41 extern int numeric_ids;
  42 extern int recurse;
  43 extern int xfer_dirs;
  44 extern int filesfrom_fd;
  45 extern int one_file_system;
  46 extern int keep_dirlinks;
  47 extern int preserve_links;
  48 extern int preserve_hard_links;
  49 extern int preserve_perms;
  50 extern int preserve_devices;
  51 extern int preserve_uid;
  52 extern int preserve_gid;
  53 extern int relative_paths;
  54 extern int implied_dirs;
  55 extern int copy_links;
  56 extern int copy_unsafe_links;
  57 extern int protocol_version;
  58 extern int sanitize_paths;
  59 extern int orig_umask;
  60 extern struct stats stats;
  61 extern struct file_list *the_file_list;
  62
  63 extern char curr_dir[MAXPATHLEN];
  64
  65 extern struct filter_list_struct filter_list;
  66 extern struct filter_list_struct server_filter_list;
  67
  68 int io_error;
  69 dev_t filesystem_dev; /* used to implement -x */
  70
  71 static char empty_sum[MD4_SUM_LENGTH];
  72 static unsigned int file_struct_len;
  73 static struct file_list *sorting_flist;
  74
  75 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  76 static void output_flist(struct file_list *flist);
  77
  78 void init_flist(void)
  79 {
  80         struct file_struct f;
  81
  82         /* Figure out how big the file_struct is without trailing padding */
  83         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  84 }
  85
  86
  87 static int show_filelist_p(void)
  88 {
  89         return verbose && xfer_dirs && !am_server;
  90 }
  91
  92 static void start_filelist_progress(char *kind)
  93 {
  94         rprintf(FINFO, "%s ... ", kind);
  95         if (verbose > 1 || do_progress)
  96                 rprintf(FINFO, "\n");
  97         rflush(FINFO);
  98 }
  99
 100
 101 static void emit_filelist_progress(const struct file_list *flist)
 102 {
 103         rprintf(FINFO, " %d files...\r", flist->count);
 104 }
 105
 106
 107 static void maybe_emit_filelist_progress(const struct file_list *flist)
 108 {
 109         if (do_progress && show_filelist_p() && (flist->count % 100) == 0)
 110                 emit_filelist_progress(flist);
 111 }
 112
 113
 114 static void finish_filelist_progress(const struct file_list *flist)
 115 {
 116         if (do_progress) {
 117                 /* This overwrites the progress line */
 118                 rprintf(FINFO, "%d file%sto consider\n",
 119                         flist->count, flist->count == 1 ? " " : "s ");
 120         } else
 121                 rprintf(FINFO, "done\n");
 122 }
 123
 124 void show_flist_stats(void)
 125 {
 126         /* Nothing yet */
 127 }
 128
 129
 130 static void list_file_entry(struct file_struct *f)
 131 {
 132         char perms[11];
 133
 134         if (!f->basename) {
 135                 /* this can happen if duplicate names were removed */
 136                 return;
 137         }
 138
 139         permstring(perms, f->mode);
 140
 141 #ifdef SUPPORT_LINKS
 142         if (preserve_links && S_ISLNK(f->mode)) {
 143                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 144                         perms,
 145                         (double)f->length, timestring(f->modtime),
 146                         safe_fname(f_name(f)), safe_fname(f->u.link));
 147         } else
 148 #endif
 149         {
 150                 rprintf(FINFO, "%s %11.0f %s %s\n",
 151                         perms,
 152                         (double)f->length, timestring(f->modtime),
 153                         safe_fname(f_name(f)));
 154         }
 155 }
 156
 157
 158 /**
 159  * Stat either a symlink or its referent, depending on the settings of
 160  * copy_links, copy_unsafe_links, etc.
 161  *
 162  * @retval -1 on error
 163  *
 164  * @retval 0 for success
 165  *
 166  * @post If @p path is a symlink, then @p linkbuf (of size @c
 167  * MAXPATHLEN) contains the symlink target.
 168  *
 169  * @post @p buffer contains information about the link or the
 170  * referrent as appropriate, if they exist.
 171  **/
 172 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 173 {
 174 #ifdef SUPPORT_LINKS
 175         if (copy_links)
 176                 return do_stat(path, buffer);
 177         if (link_stat(path, buffer, 0) < 0)
 178                 return -1;
 179         if (S_ISLNK(buffer->st_mode)) {
 180                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 181                 if (l == -1)
 182                         return -1;
 183                 linkbuf[l] = 0;
 184                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 185                         if (verbose > 1) {
 186                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 187                                         safe_fname(path), safe_fname(linkbuf));
 188                         }
 189                         return do_stat(path, buffer);
 190                 }
 191         }
 192         return 0;
 193 #else
 194         return do_stat(path, buffer);
 195 #endif
 196 }
 197
 198 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 199 {
 200 #ifdef SUPPORT_LINKS
 201         if (copy_links)
 202                 return do_stat(path, buffer);
 203         if (do_lstat(path, buffer) < 0)
 204                 return -1;
 205         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 206                 STRUCT_STAT st;
 207                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 208                         *buffer = st;
 209         }
 210         return 0;
 211 #else
 212         return do_stat(path, buffer);
 213 #endif
 214 }
 215
 216 /* This function is used to check if a file should be included/excluded
 217  * from the list of files based on its name and type etc.  The value of
 218  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 219 static int is_excluded(char *fname, int is_dir, int filter_level)
 220 {
 221 #if 0 /* This currently never happens, so avoid a useless compare. */
 222         if (filter_level == NO_FILTERS)
 223                 return 0;
 224 #endif
 225         if (fname) {
 226                 /* never exclude '.', even if somebody does --exclude '*' */
 227                 if (fname[0] == '.' && !fname[1])
 228                         return 0;
 229                 /* Handle the -R version of the '.' dir. */
 230                 if (fname[0] == '/') {
 231                         int len = strlen(fname);
 232                         if (fname[len-1] == '.' && fname[len-2] == '/')
 233                                 return 0;
 234                 }
 235         }
 236         if (server_filter_list.head
 237             && check_filter(&server_filter_list, fname, is_dir) < 0)
 238                 return 1;
 239         if (filter_level != ALL_FILTERS)
 240                 return 0;
 241         if (filter_list.head
 242             && check_filter(&filter_list, fname, is_dir) < 0)
 243                 return 1;
 244         return 0;
 245 }
 246
 247 static int to_wire_mode(mode_t mode)
 248 {
 249 #ifdef SUPPORT_LINKS
 250         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 251                 return (mode & ~(_S_IFMT)) | 0120000;
 252 #endif
 253         return (int)mode;
 254 }
 255
 256 static mode_t from_wire_mode(int mode)
 257 {
 258         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 259                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 260         return (mode_t)mode;
 261 }
 262
 263
 264 static void send_directory(int f, struct file_list *flist,
 265                            char *fbuf, int len);
 266
 267 static char *flist_dir;
 268 static int flist_dir_len;
 269
 270
 271 /**
 272  * Make sure @p flist is big enough to hold at least @p flist->count
 273  * entries.
 274  **/
 275 void flist_expand(struct file_list *flist)
 276 {
 277         struct file_struct **new_ptr;
 278
 279         if (flist->count < flist->malloced)
 280                 return;
 281
 282         if (flist->malloced < FLIST_START)
 283                 flist->malloced = FLIST_START;
 284         else if (flist->malloced >= FLIST_LINEAR)
 285                 flist->malloced += FLIST_LINEAR;
 286         else
 287                 flist->malloced *= 2;
 288
 289         /*
 290          * In case count jumped or we are starting the list
 291          * with a known size just set it.
 292          */
 293         if (flist->malloced < flist->count)
 294                 flist->malloced = flist->count;
 295
 296         new_ptr = realloc_array(flist->files, struct file_struct *,
 297                                 flist->malloced);
 298
 299         if (verbose >= 2 && flist->malloced != FLIST_START) {
 300                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 301                     who_am_i(),
 302                     (double)sizeof flist->files[0] * flist->malloced,
 303                     (new_ptr == flist->files) ? " not" : "");
 304         }
 305
 306         flist->files = new_ptr;
 307
 308         if (!flist->files)
 309                 out_of_memory("flist_expand");
 310 }
 311
 312 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 313 {
 314         unsigned short flags;
 315         static time_t modtime;
 316         static mode_t mode;
 317         static int64 dev;
 318         static dev_t rdev;
 319         static uint32 rdev_major;
 320         static uid_t uid;
 321         static gid_t gid;
 322         static char lastname[MAXPATHLEN];
 323         char fname[MAXPATHLEN];
 324         int l1, l2;
 325
 326         if (f < 0)
 327                 return;
 328
 329         if (!file) {
 330                 write_byte(f, 0);
 331                 modtime = 0, mode = 0;
 332                 dev = 0, rdev = makedev(0, 0);
 333                 rdev_major = 0;
 334                 uid = 0, gid = 0;
 335                 *lastname = '\0';
 336                 return;
 337         }
 338
 339         io_write_phase = "send_file_entry";
 340
 341         f_name_to(file, fname);
 342
 343         flags = base_flags;
 344
 345         if (file->mode == mode)
 346                 flags |= XMIT_SAME_MODE;
 347         else
 348                 mode = file->mode;
 349         if (preserve_devices) {
 350                 if (protocol_version < 28) {
 351                         if (IS_DEVICE(mode)) {
 352                                 if (file->u.rdev == rdev)
 353                                         flags |= XMIT_SAME_RDEV_pre28;
 354                                 else
 355                                         rdev = file->u.rdev;
 356                         } else
 357                                 rdev = makedev(0, 0);
 358                 } else if (IS_DEVICE(mode)) {
 359                         rdev = file->u.rdev;
 360                         if ((uint32)major(rdev) == rdev_major)
 361                                 flags |= XMIT_SAME_RDEV_MAJOR;
 362                         else
 363                                 rdev_major = major(rdev);
 364                         if ((uint32)minor(rdev) <= 0xFFu)
 365                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 366                 }
 367         }
 368         if (file->uid == uid)
 369                 flags |= XMIT_SAME_UID;
 370         else
 371                 uid = file->uid;
 372         if (file->gid == gid)
 373                 flags |= XMIT_SAME_GID;
 374         else
 375                 gid = file->gid;
 376         if (file->modtime == modtime)
 377                 flags |= XMIT_SAME_TIME;
 378         else
 379                 modtime = file->modtime;
 380
 381 #ifdef SUPPORT_HARD_LINKS
 382         if (file->link_u.idev) {
 383                 if (file->F_DEV == dev) {
 384                         if (protocol_version >= 28)
 385                                 flags |= XMIT_SAME_DEV;
 386                 } else
 387                         dev = file->F_DEV;
 388                 flags |= XMIT_HAS_IDEV_DATA;
 389         }
 390 #endif
 391
 392         for (l1 = 0;
 393             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 394             l1++) {}
 395         l2 = strlen(fname+l1);
 396
 397         if (l1 > 0)
 398                 flags |= XMIT_SAME_NAME;
 399         if (l2 > 255)
 400                 flags |= XMIT_LONG_NAME;
 401
 402         /* We must make sure we don't send a zero flag byte or the
 403          * other end will terminate the flist transfer.  Note that
 404          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 405          * it's harmless way to add a bit to the first flag byte. */
 406         if (protocol_version >= 28) {
 407                 if (!flags && !S_ISDIR(mode))
 408                         flags |= XMIT_TOP_DIR;
 409                 if ((flags & 0xFF00) || !flags) {
 410                         flags |= XMIT_EXTENDED_FLAGS;
 411                         write_byte(f, flags);
 412                         write_byte(f, flags >> 8);
 413                 } else
 414                         write_byte(f, flags);
 415         } else {
 416                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 417                         flags |= XMIT_TOP_DIR;
 418                 if (!(flags & 0xFF))
 419                         flags |= XMIT_LONG_NAME;
 420                 write_byte(f, flags);
 421         }
 422         if (flags & XMIT_SAME_NAME)
 423                 write_byte(f, l1);
 424         if (flags & XMIT_LONG_NAME)
 425                 write_int(f, l2);
 426         else
 427                 write_byte(f, l2);
 428         write_buf(f, fname + l1, l2);
 429
 430         write_longint(f, file->length);
 431         if (!(flags & XMIT_SAME_TIME))
 432                 write_int(f, modtime);
 433         if (!(flags & XMIT_SAME_MODE))
 434                 write_int(f, to_wire_mode(mode));
 435         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 436                 if (!numeric_ids)
 437                         add_uid(uid);
 438                 write_int(f, uid);
 439         }
 440         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 441                 if (!numeric_ids)
 442                         add_gid(gid);
 443                 write_int(f, gid);
 444         }
 445         if (preserve_devices && IS_DEVICE(mode)) {
 446                 if (protocol_version < 28) {
 447                         if (!(flags & XMIT_SAME_RDEV_pre28))
 448                                 write_int(f, (int)rdev);
 449                 } else {
 450                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 451                                 write_int(f, major(rdev));
 452                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 453                                 write_byte(f, minor(rdev));
 454                         else
 455                                 write_int(f, minor(rdev));
 456                 }
 457         }
 458
 459 #ifdef SUPPORT_LINKS
 460         if (preserve_links && S_ISLNK(mode)) {
 461                 int len = strlen(file->u.link);
 462                 write_int(f, len);
 463                 write_buf(f, file->u.link, len);
 464         }
 465 #endif
 466
 467 #ifdef SUPPORT_HARD_LINKS
 468         if (flags & XMIT_HAS_IDEV_DATA) {
 469                 if (protocol_version < 26) {
 470                         /* 32-bit dev_t and ino_t */
 471                         write_int(f, dev);
 472                         write_int(f, file->F_INODE);
 473                 } else {
 474                         /* 64-bit dev_t and ino_t */
 475                         if (!(flags & XMIT_SAME_DEV))
 476                                 write_longint(f, dev);
 477                         write_longint(f, file->F_INODE);
 478                 }
 479         }
 480 #endif
 481
 482         if (always_checksum) {
 483                 char *sum;
 484                 if (S_ISREG(mode))
 485                         sum = file->u.sum;
 486                 else if (protocol_version < 28) {
 487                         /* Prior to 28, we sent a useless set of nulls. */
 488                         sum = empty_sum;
 489                 } else
 490                         sum = NULL;
 491                 if (sum) {
 492                         write_buf(f, sum,
 493                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 494                 }
 495         }
 496
 497         strlcpy(lastname, fname, MAXPATHLEN);
 498
 499         io_write_phase = "unknown";
 500 }
 501
 502
 503
 504 static struct file_struct *receive_file_entry(struct file_list *flist,
 505                                               unsigned short flags, int f)
 506 {
 507         static time_t modtime;
 508         static mode_t mode;
 509         static int64 dev;
 510         static dev_t rdev;
 511         static uint32 rdev_major;
 512         static uid_t uid;
 513         static gid_t gid;
 514         static char lastname[MAXPATHLEN], *lastdir;
 515         static int lastdir_depth, lastdir_len = -1;
 516         static unsigned int del_hier_name_len = 0;
 517         static int in_del_hier = 0;
 518         char thisname[MAXPATHLEN];
 519         unsigned int l1 = 0, l2 = 0;
 520         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 521         OFF_T file_length;
 522         char *basename, *dirname, *bp;
 523         struct file_struct *file;
 524
 525         if (!flist) {
 526                 modtime = 0, mode = 0;
 527                 dev = 0, rdev = makedev(0, 0);
 528                 rdev_major = 0;
 529                 uid = 0, gid = 0;
 530                 *lastname = '\0';
 531                 lastdir_len = -1;
 532                 in_del_hier = 0;
 533                 return NULL;
 534         }
 535
 536         if (flags & XMIT_SAME_NAME)
 537                 l1 = read_byte(f);
 538
 539         if (flags & XMIT_LONG_NAME)
 540                 l2 = read_int(f);
 541         else
 542                 l2 = read_byte(f);
 543
 544         if (l2 >= MAXPATHLEN - l1) {
 545                 rprintf(FERROR,
 546                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 547                         flags, l1, l2, safe_fname(lastname));
 548                 overflow("receive_file_entry");
 549         }
 550
 551         strlcpy(thisname, lastname, l1 + 1);
 552         read_sbuf(f, &thisname[l1], l2);
 553         thisname[l1 + l2] = 0;
 554
 555         strlcpy(lastname, thisname, MAXPATHLEN);
 556
 557         clean_fname(thisname, 0);
 558
 559         if (sanitize_paths)
 560                 sanitize_path(thisname, thisname, "", 0);
 561
 562         if ((basename = strrchr(thisname, '/')) != NULL) {
 563                 dirname_len = ++basename - thisname; /* counts future '\0' */
 564                 if (lastdir_len == dirname_len - 1
 565                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 566                         dirname = lastdir;
 567                         dirname_len = 0; /* indicates no copy is needed */
 568                 } else
 569                         dirname = thisname;
 570         } else {
 571                 basename = thisname;
 572                 dirname = NULL;
 573                 dirname_len = 0;
 574         }
 575         basename_len = strlen(basename) + 1; /* count the '\0' */
 576
 577         file_length = read_longint(f);
 578         if (!(flags & XMIT_SAME_TIME))
 579                 modtime = (time_t)read_int(f);
 580         if (!(flags & XMIT_SAME_MODE))
 581                 mode = from_wire_mode(read_int(f));
 582
 583         if (preserve_uid && !(flags & XMIT_SAME_UID))
 584                 uid = (uid_t)read_int(f);
 585         if (preserve_gid && !(flags & XMIT_SAME_GID))
 586                 gid = (gid_t)read_int(f);
 587
 588         if (preserve_devices) {
 589                 if (protocol_version < 28) {
 590                         if (IS_DEVICE(mode)) {
 591                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 592                                         rdev = (dev_t)read_int(f);
 593                         } else
 594                                 rdev = makedev(0, 0);
 595                 } else if (IS_DEVICE(mode)) {
 596                         uint32 rdev_minor;
 597                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 598                                 rdev_major = read_int(f);
 599                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 600                                 rdev_minor = read_byte(f);
 601                         else
 602                                 rdev_minor = read_int(f);
 603                         rdev = makedev(rdev_major, rdev_minor);
 604                 }
 605         }
 606
 607 #ifdef SUPPORT_LINKS
 608         if (preserve_links && S_ISLNK(mode)) {
 609                 linkname_len = read_int(f) + 1; /* count the '\0' */
 610                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 611                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 612                                 linkname_len - 1);
 613                         overflow("receive_file_entry");
 614                 }
 615         }
 616         else
 617 #endif
 618                 linkname_len = 0;
 619
 620         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 621
 622         alloc_len = file_struct_len + dirname_len + basename_len
 623                   + linkname_len + sum_len;
 624         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 625
 626         file = (struct file_struct *)bp;
 627         memset(bp, 0, file_struct_len);
 628         bp += file_struct_len;
 629
 630         file->flags = 0;
 631         file->modtime = modtime;
 632         file->length = file_length;
 633         file->mode = mode;
 634         file->uid = uid;
 635         file->gid = gid;
 636
 637         if (dirname_len) {
 638                 file->dirname = lastdir = bp;
 639                 lastdir_len = dirname_len - 1;
 640                 memcpy(bp, dirname, dirname_len - 1);
 641                 bp += dirname_len;
 642                 bp[-1] = '\0';
 643                 lastdir_depth = count_dir_elements(lastdir);
 644                 file->dir.depth = lastdir_depth + 1;
 645         } else if (dirname) {
 646                 file->dirname = dirname; /* we're reusing lastname */
 647                 file->dir.depth = lastdir_depth + 1;
 648         } else
 649                 file->dir.depth = 1;
 650
 651         if (S_ISDIR(mode)) {
 652                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 653                         file->dir.depth--;
 654                 if (flags & XMIT_TOP_DIR) {
 655                         in_del_hier = 1;
 656                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 657                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 658                 } else if (in_del_hier) {
 659                         if (!relative_paths || !del_hier_name_len
 660                          || (l1 >= del_hier_name_len
 661                           && thisname[del_hier_name_len] == '/'))
 662                                 file->flags |= FLAG_DEL_HERE;
 663                         else
 664                                 in_del_hier = 0;
 665                 }
 666         }
 667
 668         file->basename = bp;
 669         memcpy(bp, basename, basename_len);
 670         bp += basename_len;
 671
 672         if (preserve_devices && IS_DEVICE(mode))
 673                 file->u.rdev = rdev;
 674
 675 #ifdef SUPPORT_LINKS
 676         if (linkname_len) {
 677                 file->u.link = bp;
 678                 read_sbuf(f, bp, linkname_len - 1);
 679                 if (sanitize_paths)
 680                         sanitize_path(bp, bp, "", lastdir_depth);
 681                 bp += linkname_len;
 682         }
 683 #endif
 684
 685 #ifdef SUPPORT_HARD_LINKS
 686         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 687                 flags |= XMIT_HAS_IDEV_DATA;
 688         if (flags & XMIT_HAS_IDEV_DATA) {
 689                 int64 inode;
 690                 if (protocol_version < 26) {
 691                         dev = read_int(f);
 692                         inode = read_int(f);
 693                 } else {
 694                         if (!(flags & XMIT_SAME_DEV))
 695                                 dev = read_longint(f);
 696                         inode = read_longint(f);
 697                 }
 698                 if (flist->hlink_pool) {
 699                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 700                             struct idev, 1, "inode_table");
 701                         file->F_INODE = inode;
 702                         file->F_DEV = dev;
 703                 }
 704         }
 705 #endif
 706
 707         if (always_checksum) {
 708                 char *sum;
 709                 if (sum_len) {
 710                         file->u.sum = sum = bp;
 711                         /*bp += sum_len;*/
 712                 } else if (protocol_version < 28) {
 713                         /* Prior to 28, we get a useless set of nulls. */
 714                         sum = empty_sum;
 715                 } else
 716                         sum = NULL;
 717                 if (sum) {
 718                         read_buf(f, sum,
 719                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 720                 }
 721         }
 722
 723         if (!preserve_perms) {
 724                 /* set an appropriate set of permissions based on original
 725                  * permissions and umask. This emulates what GNU cp does */
 726                 file->mode &= ~orig_umask;
 727         }
 728
 729         return file;
 730 }
 731
 732
 733 /**
 734  * Create a file_struct for a named file by reading its stat()
 735  * information and performing extensive checks against global
 736  * options.
 737  *
 738  * @return the new file, or NULL if there was an error or this file
 739  * should be excluded.
 740  *
 741  * @todo There is a small optimization opportunity here to avoid
 742  * stat()ing the file in some circumstances, which has a certain cost.
 743  * We are called immediately after doing readdir(), and so we may
 744  * already know the d_type of the file.  We could for example avoid
 745  * statting directories if we're not recursing, but this is not a very
 746  * important case.  Some systems may not have d_type.
 747  **/
 748 struct file_struct *make_file(char *fname, struct file_list *flist,
 749                               int filter_level)
 750 {
 751         static char *lastdir;
 752         static int lastdir_len = -1;
 753         struct file_struct *file;
 754         STRUCT_STAT st;
 755         char sum[SUM_LENGTH];
 756         char thisname[MAXPATHLEN];
 757         char linkname[MAXPATHLEN];
 758         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 759         char *basename, *dirname, *bp;
 760         unsigned short flags = 0;
 761
 762         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 763                 lastdir_len = -1;
 764
 765         if (strlcpy(thisname, fname, sizeof thisname)
 766             >= sizeof thisname - flist_dir_len) {
 767                 rprintf(FINFO, "skipping overly long name: %s\n",
 768                         safe_fname(fname));
 769                 return NULL;
 770         }
 771         clean_fname(thisname, 0);
 772         if (sanitize_paths)
 773                 sanitize_path(thisname, thisname, "", 0);
 774
 775         memset(sum, 0, SUM_LENGTH);
 776
 777         if (readlink_stat(thisname, &st, linkname) != 0) {
 778                 int save_errno = errno;
 779                 /* See if file is excluded before reporting an error. */
 780                 if (filter_level != NO_FILTERS
 781                     && is_excluded(thisname, 0, filter_level))
 782                         return NULL;
 783                 if (save_errno == ENOENT) {
 784 #ifdef SUPPORT_LINKS
 785                         /* Avoid "vanished" error if symlink points nowhere. */
 786                         if (copy_links && do_lstat(thisname, &st) == 0
 787                             && S_ISLNK(st.st_mode)) {
 788                                 io_error |= IOERR_GENERAL;
 789                                 rprintf(FERROR, "symlink has no referent: %s\n",
 790                                         full_fname(thisname));
 791                         } else
 792 #endif
 793                         {
 794                                 enum logcode c = am_daemon && protocol_version < 28
 795                                     ? FERROR : FINFO;
 796                                 io_error |= IOERR_VANISHED;
 797                                 rprintf(c, "file has vanished: %s\n",
 798                                         full_fname(thisname));
 799                         }
 800                 } else {
 801                         io_error |= IOERR_GENERAL;
 802                         rsyserr(FERROR, save_errno, "readlink %s failed",
 803                                 full_fname(thisname));
 804                 }
 805                 return NULL;
 806         }
 807
 808         /* backup.c calls us with filter_level set to NO_FILTERS. */
 809         if (filter_level == NO_FILTERS)
 810                 goto skip_filters;
 811
 812         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 813                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
 814                 return NULL;
 815         }
 816
 817         /* We only care about directories because we need to avoid recursing
 818          * into a mount-point directory, not to avoid copying a symlinked
 819          * file if -L (or similar) was specified. */
 820         if (one_file_system && st.st_dev != filesystem_dev
 821             && S_ISDIR(st.st_mode))
 822                 flags |= FLAG_MOUNT_POINT;
 823
 824         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 825                 return NULL;
 826
 827         if (lp_ignore_nonreadable(module_id)) {
 828 #ifdef SUPPORT_LINKS
 829                 if (!S_ISLNK(st.st_mode))
 830 #endif
 831                         if (access(thisname, R_OK) != 0)
 832                                 return NULL;
 833         }
 834
 835 skip_filters:
 836
 837         if (verbose > 2) {
 838                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 839                         who_am_i(), safe_fname(thisname), filter_level);
 840         }
 841
 842         if ((basename = strrchr(thisname, '/')) != NULL) {
 843                 dirname_len = ++basename - thisname; /* counts future '\0' */
 844                 if (lastdir_len == dirname_len - 1
 845                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 846                         dirname = lastdir;
 847                         dirname_len = 0; /* indicates no copy is needed */
 848                 } else
 849                         dirname = thisname;
 850         } else {
 851                 basename = thisname;
 852                 dirname = NULL;
 853                 dirname_len = 0;
 854         }
 855         basename_len = strlen(basename) + 1; /* count the '\0' */
 856
 857 #ifdef SUPPORT_LINKS
 858         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 859 #else
 860         linkname_len = 0;
 861 #endif
 862
 863         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 864
 865         alloc_len = file_struct_len + dirname_len + basename_len
 866             + linkname_len + sum_len;
 867         if (flist) {
 868                 bp = pool_alloc(flist->file_pool, alloc_len,
 869                     "receive_file_entry");
 870         } else {
 871                 if (!(bp = new_array(char, alloc_len)))
 872                         out_of_memory("receive_file_entry");
 873         }
 874
 875         file = (struct file_struct *)bp;
 876         memset(bp, 0, file_struct_len);
 877         bp += file_struct_len;
 878
 879         file->flags = flags;
 880         file->modtime = st.st_mtime;
 881         file->length = st.st_size;
 882         file->mode = st.st_mode;
 883         file->uid = st.st_uid;
 884         file->gid = st.st_gid;
 885
 886 #ifdef SUPPORT_HARD_LINKS
 887         if (flist && flist->hlink_pool) {
 888                 if (protocol_version < 28) {
 889                         if (S_ISREG(st.st_mode))
 890                                 file->link_u.idev = pool_talloc(
 891                                     flist->hlink_pool, struct idev, 1,
 892                                     "inode_table");
 893                 } else {
 894                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 895                                 file->link_u.idev = pool_talloc(
 896                                     flist->hlink_pool, struct idev, 1,
 897                                     "inode_table");
 898                 }
 899         }
 900         if (file->link_u.idev) {
 901                 file->F_DEV = st.st_dev;
 902                 file->F_INODE = st.st_ino;
 903         }
 904 #endif
 905
 906         if (dirname_len) {
 907                 file->dirname = lastdir = bp;
 908                 lastdir_len = dirname_len - 1;
 909                 memcpy(bp, dirname, dirname_len - 1);
 910                 bp += dirname_len;
 911                 bp[-1] = '\0';
 912         } else if (dirname)
 913                 file->dirname = dirname;
 914
 915         file->basename = bp;
 916         memcpy(bp, basename, basename_len);
 917         bp += basename_len;
 918
 919 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 920         if (preserve_devices && IS_DEVICE(st.st_mode))
 921                 file->u.rdev = st.st_rdev;
 922 #endif
 923
 924 #ifdef SUPPORT_LINKS
 925         if (linkname_len) {
 926                 file->u.link = bp;
 927                 memcpy(bp, linkname, linkname_len);
 928                 bp += linkname_len;
 929         }
 930 #endif
 931
 932         if (sum_len) {
 933                 file->u.sum = bp;
 934                 file_checksum(thisname, bp, st.st_size);
 935                 /*bp += sum_len;*/
 936         }
 937
 938         file->dir.root = flist_dir;
 939
 940         /* This code is only used by the receiver when it is building
 941          * a list of files for a delete pass. */
 942         if (keep_dirlinks && linkname_len && flist) {
 943                 STRUCT_STAT st2;
 944                 int save_mode = file->mode;
 945                 file->mode = S_IFDIR; /* find a directory w/our name */
 946                 if (flist_find(the_file_list, file) >= 0
 947                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 948                         file->modtime = st2.st_mtime;
 949                         file->length = st2.st_size;
 950                         file->mode = st2.st_mode;
 951                         file->uid = st2.st_uid;
 952                         file->gid = st2.st_gid;
 953                         file->u.link = NULL;
 954                 } else
 955                         file->mode = save_mode;
 956         }
 957
 958         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 959                 stats.total_size += st.st_size;
 960
 961         return file;
 962 }
 963
 964
 965 static struct file_struct *send_file_name(int f, struct file_list *flist,
 966                                           char *fname, unsigned short base_flags)
 967 {
 968         struct file_struct *file;
 969
 970         file = make_file(fname, flist, f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 971         if (!file)
 972                 return NULL;
 973
 974         maybe_emit_filelist_progress(flist);
 975
 976         flist_expand(flist);
 977
 978         if (file->basename[0]) {
 979                 flist->files[flist->count++] = file;
 980                 send_file_entry(file, f, base_flags);
 981         }
 982         return file;
 983 }
 984
 985 static void send_if_directory(int f, struct file_list *flist,
 986                               struct file_struct *file)
 987 {
 988         char fbuf[MAXPATHLEN];
 989
 990         if (S_ISDIR(file->mode)
 991             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 992                 void *save_filters;
 993                 unsigned int len = strlen(fbuf);
 994                 if (len > 1 && fbuf[len-1] == '/')
 995                         fbuf[--len] = '\0';
 996                 if (len >= MAXPATHLEN - 1) {
 997                         io_error |= IOERR_GENERAL;
 998                         rprintf(FERROR, "skipping long-named directory: %s\n",
 999                                 full_fname(fbuf));
1000                         return;
1001                 }
1002                 save_filters = push_local_filters(fbuf, len);
1003                 send_directory(f, flist, fbuf, len);
1004                 pop_local_filters(save_filters);
1005         }
1006 }
1007
1008
1009 /* This function is normally called by the sender, but the receiving side also
1010  * calls it from delete_in_dir() with f set to -1 so that we just construct the
1011  * file list in memory without sending it over the wire.  Also, get_dirlist()
1012  * might call this with f set to -2, which also indicates that local filter
1013  * rules should be ignored. */
1014 static void send_directory(int f, struct file_list *flist,
1015                            char *fbuf, int len)
1016 {
1017         struct dirent *di;
1018         unsigned remainder;
1019         char *p;
1020         DIR *d;
1021         int start = flist->count;
1022
1023         if (!(d = opendir(fbuf))) {
1024                 io_error |= IOERR_GENERAL;
1025                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1026                 return;
1027         }
1028
1029         p = fbuf + len;
1030         if (len != 1 || *fbuf != '/')
1031                 *p++ = '/';
1032         *p = '\0';
1033         remainder = MAXPATHLEN - (p - fbuf);
1034
1035         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1036                 char *dname = d_name(di);
1037                 if (dname[0] == '.' && (dname[1] == '\0'
1038                     || (dname[1] == '.' && dname[2] == '\0')))
1039                         continue;
1040                 if (strlcpy(p, dname, remainder) < remainder)
1041                         send_file_name(f, flist, fbuf, 0);
1042                 else {
1043                         io_error |= IOERR_GENERAL;
1044                         rprintf(FINFO,
1045                                 "cannot send long-named file %s\n",
1046                                 full_fname(fbuf));
1047                 }
1048         }
1049
1050         fbuf[len] = '\0';
1051
1052         if (errno) {
1053                 io_error |= IOERR_GENERAL;
1054                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1055         }
1056
1057         closedir(d);
1058
1059         if (recurse) {
1060                 int i, end = flist->count - 1;
1061                 for (i = start; i <= end; i++)
1062                         send_if_directory(f, flist, flist->files[i]);
1063         }
1064 }
1065
1066
1067 struct file_list *send_file_list(int f, int argc, char *argv[])
1068 {
1069         int l;
1070         STRUCT_STAT st;
1071         char *p, *dir, olddir[sizeof curr_dir];
1072         char lastpath[MAXPATHLEN] = "";
1073         struct file_list *flist;
1074         struct timeval start_tv, end_tv;
1075         int64 start_write;
1076         int use_ff_fd = 0;
1077
1078         if (show_filelist_p())
1079                 start_filelist_progress("building file list");
1080
1081         start_write = stats.total_written;
1082         gettimeofday(&start_tv, NULL);
1083
1084         flist = flist_new(WITH_HLINK, "send_file_list");
1085
1086         io_start_buffering_out();
1087         if (filesfrom_fd >= 0) {
1088                 if (argv[0] && !push_dir(argv[0])) {
1089                         rsyserr(FERROR, errno, "push_dir %s failed",
1090                                 full_fname(argv[0]));
1091                         exit_cleanup(RERR_FILESELECT);
1092                 }
1093                 use_ff_fd = 1;
1094         }
1095
1096         while (1) {
1097                 struct file_struct *file;
1098                 char fname2[MAXPATHLEN];
1099                 char *fname = fname2;
1100                 int is_dot_dir;
1101
1102                 if (use_ff_fd) {
1103                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1104                                 break;
1105                         sanitize_path(fname, fname, "", 0);
1106                 } else {
1107                         if (argc-- == 0)
1108                                 break;
1109                         strlcpy(fname, *argv++, MAXPATHLEN);
1110                         if (sanitize_paths)
1111                                 sanitize_path(fname, fname, "", 0);
1112                 }
1113
1114                 l = strlen(fname);
1115                 if (!l || fname[l - 1] == '/') {
1116                         if (l == 2 && fname[0] == '.') {
1117                                 /* Turn "./" into just "." rather than "./." */
1118                                 fname[1] = '\0';
1119                         } else if (l < MAXPATHLEN) {
1120                                 fname[l++] = '.';
1121                                 fname[l] = '\0';
1122                         }
1123                         is_dot_dir = 1;
1124                 } else {
1125                         is_dot_dir = fname[l-1] == '.'
1126                                    && (l == 1 || fname[l-2] == '/');
1127                 }
1128
1129                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1130                         io_error |= IOERR_GENERAL;
1131                         rsyserr(FERROR, errno, "link_stat %s failed",
1132                                 full_fname(fname));
1133                         continue;
1134                 }
1135
1136                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1137                         rprintf(FINFO, "skipping directory %s\n",
1138                                 safe_fname(fname));
1139                         continue;
1140                 }
1141
1142                 dir = NULL;
1143                 olddir[0] = '\0';
1144
1145                 if (!relative_paths) {
1146                         p = strrchr(fname, '/');
1147                         if (p) {
1148                                 *p = 0;
1149                                 if (p == fname)
1150                                         dir = "/";
1151                                 else
1152                                         dir = fname;
1153                                 fname = p + 1;
1154                         }
1155                 } else if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1156                         /* this ensures we send the intermediate directories,
1157                            thus getting their permissions right */
1158                         char *lp = lastpath, *fn = fname, *slash = fname;
1159                         *p = 0;
1160                         /* Skip any initial directories in our path that we
1161                          * have in common with lastpath. */
1162                         while (*fn && *lp == *fn) {
1163                                 if (*fn == '/')
1164                                         slash = fn;
1165                                 lp++, fn++;
1166                         }
1167                         *p = '/';
1168                         if (fn != p || (*lp && *lp != '/')) {
1169                                 int save_copy_links = copy_links;
1170                                 int save_xfer_dirs = xfer_dirs;
1171                                 copy_links = copy_unsafe_links;
1172                                 xfer_dirs = 1;
1173                                 while ((slash = strchr(slash+1, '/')) != 0) {
1174                                         *slash = 0;
1175                                         send_file_name(f, flist, fname, 0);
1176                                         *slash = '/';
1177                                 }
1178                                 copy_links = save_copy_links;
1179                                 xfer_dirs = save_xfer_dirs;
1180                                 *p = 0;
1181                                 strlcpy(lastpath, fname, sizeof lastpath);
1182                                 *p = '/';
1183                         }
1184                 }
1185
1186                 if (!*fname)
1187                         fname = ".";
1188
1189                 if (dir && *dir) {
1190                         static char *lastdir;
1191                         static int lastdir_len;
1192
1193                         strcpy(olddir, curr_dir); /* can't overflow */
1194
1195                         if (!push_dir(dir)) {
1196                                 io_error |= IOERR_GENERAL;
1197                                 rsyserr(FERROR, errno, "push_dir %s failed",
1198                                         full_fname(dir));
1199                                 continue;
1200                         }
1201
1202                         if (lastdir && strcmp(lastdir, dir) == 0) {
1203                                 flist_dir = lastdir;
1204                                 flist_dir_len = lastdir_len;
1205                         } else {
1206                                 flist_dir = lastdir = strdup(dir);
1207                                 flist_dir_len = lastdir_len = strlen(dir);
1208                         }
1209                 }
1210
1211                 if (one_file_system)
1212                         filesystem_dev = st.st_dev;
1213
1214                 if ((file = send_file_name(f, flist, fname, XMIT_TOP_DIR))) {
1215                         if (recurse || (xfer_dirs && is_dot_dir))
1216                                 send_if_directory(f, flist, file);
1217                 }
1218
1219                 if (olddir[0]) {
1220                         flist_dir = NULL;
1221                         flist_dir_len = 0;
1222                         if (!pop_dir(olddir)) {
1223                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1224                                         full_fname(dir));
1225                                 exit_cleanup(RERR_FILESELECT);
1226                         }
1227                 }
1228         }
1229
1230         gettimeofday(&end_tv, NULL);
1231         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1232                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1233         if (stats.flist_buildtime == 0)
1234                 stats.flist_buildtime = 1;
1235         start_tv = end_tv;
1236
1237         send_file_entry(NULL, f, 0);
1238
1239         if (show_filelist_p())
1240                 finish_filelist_progress(flist);
1241
1242         gettimeofday(&end_tv, NULL);
1243         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1244                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1245
1246         if (flist->hlink_pool) {
1247                 pool_destroy(flist->hlink_pool);
1248                 flist->hlink_pool = NULL;
1249         }
1250
1251         /* Sort the list without removing any duplicates.  This allows the
1252          * receiving side to ask for any name they like, which gives us the
1253          * flexibility to change the way we unduplicate names in the future
1254          * without causing a compatibility problem with older versions. */
1255         clean_flist(flist, 0, 0);
1256
1257         /* Now send the uid/gid list. This was introduced in
1258          * protocol version 15 */
1259         send_uid_list(f);
1260
1261         /* send the io_error flag */
1262         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1263
1264         io_end_buffering();
1265         stats.flist_size = stats.total_written - start_write;
1266         stats.num_files = flist->count;
1267
1268         if (verbose > 3)
1269                 output_flist(flist);
1270
1271         if (verbose > 2)
1272                 rprintf(FINFO, "send_file_list done\n");
1273
1274         return flist;
1275 }
1276
1277
1278 struct file_list *recv_file_list(int f)
1279 {
1280         struct file_list *flist;
1281         unsigned short flags;
1282         int64 start_read;
1283
1284         if (show_filelist_p())
1285                 start_filelist_progress("receiving file list");
1286
1287         start_read = stats.total_read;
1288
1289         flist = flist_new(WITH_HLINK, "recv_file_list");
1290
1291         flist->count = 0;
1292         flist->malloced = 1000;
1293         flist->files = new_array(struct file_struct *, flist->malloced);
1294         if (!flist->files)
1295                 goto oom;
1296
1297
1298         while ((flags = read_byte(f)) != 0) {
1299                 struct file_struct *file;
1300
1301                 flist_expand(flist);
1302
1303                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1304                         flags |= read_byte(f) << 8;
1305                 file = receive_file_entry(flist, flags, f);
1306
1307                 if (S_ISREG(file->mode))
1308                         stats.total_size += file->length;
1309
1310                 flist->files[flist->count++] = file;
1311
1312                 maybe_emit_filelist_progress(flist);
1313
1314                 if (verbose > 2) {
1315                         rprintf(FINFO, "recv_file_name(%s)\n",
1316                                 safe_fname(f_name(file)));
1317                 }
1318         }
1319         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1320
1321         if (verbose > 2)
1322                 rprintf(FINFO, "received %d names\n", flist->count);
1323
1324         if (show_filelist_p())
1325                 finish_filelist_progress(flist);
1326
1327         clean_flist(flist, relative_paths, 1);
1328
1329         if (f >= 0) {
1330                 /* Now send the uid/gid list. This was introduced in
1331                  * protocol version 15 */
1332                 recv_uid_list(f, flist);
1333
1334                 /* Recv the io_error flag */
1335                 if (lp_ignore_errors(module_id) || ignore_errors)
1336                         read_int(f);
1337                 else
1338                         io_error |= read_int(f);
1339         }
1340
1341         if (verbose > 3)
1342                 output_flist(flist);
1343
1344         if (list_only) {
1345                 int i;
1346                 for (i = 0; i < flist->count; i++)
1347                         list_file_entry(flist->files[i]);
1348         }
1349
1350         if (verbose > 2)
1351                 rprintf(FINFO, "recv_file_list done\n");
1352
1353         stats.flist_size = stats.total_read - start_read;
1354         stats.num_files = flist->count;
1355
1356         return flist;
1357
1358 oom:
1359         out_of_memory("recv_file_list");
1360         return NULL;            /* not reached */
1361 }
1362
1363
1364 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1365 {
1366         return f_name_cmp(*file1, *file2);
1367 }
1368
1369
1370 /* Search for an identically-named item in the file list.  Note that the
1371  * items must agree in their directory-ness, or no match is returned. */
1372 int flist_find(struct file_list *flist, struct file_struct *f)
1373 {
1374         int low = flist->low, high = flist->high;
1375         int ret, mid, mid_up;
1376
1377         while (low <= high) {
1378                 mid = (low + high) / 2;
1379                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1380                 if (mid_up <= high)
1381                         ret = f_name_cmp(flist->files[mid_up], f);
1382                 else
1383                         ret = 1;
1384                 if (ret == 0) {
1385                         if (protocol_version < 29
1386                             && S_ISDIR(flist->files[mid_up]->mode)
1387                             != S_ISDIR(f->mode))
1388                                 return -1;
1389                         return mid_up;
1390                 }
1391                 if (ret > 0)
1392                         high = mid - 1;
1393                 else
1394                         low = mid_up + 1;
1395         }
1396         return -1;
1397 }
1398
1399
1400 /*
1401  * Free up any resources a file_struct has allocated
1402  * and clear the file.
1403  */
1404 void clear_file(int i, struct file_list *flist)
1405 {
1406         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1407                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1408         memset(flist->files[i], 0, file_struct_len);
1409 }
1410
1411
1412 /*
1413  * allocate a new file list
1414  */
1415 struct file_list *flist_new(int with_hlink, char *msg)
1416 {
1417         struct file_list *flist;
1418
1419         flist = new(struct file_list);
1420         if (!flist)
1421                 out_of_memory(msg);
1422
1423         memset(flist, 0, sizeof (struct file_list));
1424
1425         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1426             out_of_memory, POOL_INTERN)))
1427                 out_of_memory(msg);
1428
1429 #ifdef SUPPORT_HARD_LINKS
1430         if (with_hlink && preserve_hard_links) {
1431                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1432                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1433                         out_of_memory(msg);
1434         }
1435 #endif
1436
1437         return flist;
1438 }
1439
1440 /*
1441  * free up all elements in a flist
1442  */
1443 void flist_free(struct file_list *flist)
1444 {
1445         pool_destroy(flist->file_pool);
1446         pool_destroy(flist->hlink_pool);
1447         free(flist->files);
1448         free(flist);
1449 }
1450
1451
1452 /*
1453  * This routine ensures we don't have any duplicate names in our file list.
1454  * duplicate names can cause corruption because of the pipelining
1455  */
1456 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1457 {
1458         int i, prev_i = 0;
1459
1460         if (!flist || flist->count == 0)
1461                 return;
1462
1463         sorting_flist = flist;
1464         qsort(flist->files, flist->count,
1465             sizeof flist->files[0], (int (*)())file_compare);
1466         sorting_flist = NULL;
1467
1468         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1469                 if (flist->files[i]->basename) {
1470                         prev_i = i;
1471                         break;
1472                 }
1473         }
1474         flist->low = prev_i;
1475         while (++i < flist->count) {
1476                 int j;
1477                 struct file_struct *file = flist->files[i];
1478
1479                 if (!file->basename)
1480                         continue;
1481                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1482                         j = prev_i;
1483                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1484                         int save_mode = file->mode;
1485                         /* Make sure that this directory doesn't duplicate a
1486                          * non-directory earlier in the list. */
1487                         flist->high = prev_i;
1488                         file->mode = S_IFREG;
1489                         j = flist_find(flist, file);
1490                         file->mode = save_mode;
1491                 } else
1492                         j = -1;
1493                 if (j >= 0) {
1494                         struct file_struct *fp = flist->files[j];
1495                         int keep, drop;
1496                         /* If one is a dir and the other is not, we want to
1497                          * keep the dir because it might have contents in the
1498                          * list. */
1499                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1500                                 if (S_ISDIR(file->mode))
1501                                         keep = i, drop = j;
1502                                 else
1503                                         keep = j, drop = i;
1504                         } else
1505                                 keep = j, drop = i;
1506                         if (verbose > 1 && !am_server) {
1507                                 rprintf(FINFO,
1508                                         "removing duplicate name %s from file list (%d)\n",
1509                                         safe_fname(f_name(file)), drop);
1510                         }
1511                         /* Make sure that if we unduplicate '.', that we don't
1512                          * lose track of a user-specified top directory. */
1513                         if (flist->files[drop]->flags & FLAG_TOP_DIR)
1514                                 flist->files[keep]->flags |= FLAG_TOP_DIR;
1515
1516                         clear_file(drop, flist);
1517
1518                         if (keep == i) {
1519                                 if (flist->low == drop) {
1520                                         for (j = drop + 1;
1521                                              j < i && !flist->files[j]->basename;
1522                                              j++) {}
1523                                         flist->low = j;
1524                                 }
1525                                 prev_i = i;
1526                         }
1527                 } else
1528                         prev_i = i;
1529         }
1530         flist->high = no_dups ? prev_i : flist->count - 1;
1531
1532         if (strip_root) {
1533                 /* We need to strip off the leading slashes for relative
1534                  * paths, but this must be done _after_ the sorting phase. */
1535                 for (i = flist->low; i <= flist->high; i++) {
1536                         struct file_struct *file = flist->files[i];
1537
1538                         if (!file->dirname)
1539                                 continue;
1540                         if (*file->dirname == '/') {
1541                                 char *s = file->dirname + 1;
1542                                 while (*s == '/') s++;
1543                                 memmove(file->dirname, s, strlen(s) + 1);
1544                         }
1545
1546                         if (!*file->dirname)
1547                                 file->dirname = NULL;
1548                 }
1549         }
1550 }
1551
1552
1553 static void output_flist(struct file_list *flist)
1554 {
1555         char uidbuf[16], gidbuf[16], depthbuf[16];
1556         struct file_struct *file;
1557         const char *who = who_am_i();
1558         int i;
1559
1560         for (i = 0; i < flist->count; i++) {
1561                 file = flist->files[i];
1562                 if ((am_root || am_sender) && preserve_uid)
1563                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1564                 else
1565                         *uidbuf = '\0';
1566                 if (preserve_gid && file->gid != GID_NONE)
1567                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1568                 else
1569                         *gidbuf = '\0';
1570                 if (!am_sender)
1571                         sprintf(depthbuf, "%d", file->dir.depth);
1572                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1573                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1574                         file->dirname ? safe_fname(file->dirname) : "",
1575                         file->dirname ? "/" : "", NS(file->basename),
1576                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1577                         (double)file->length, uidbuf, gidbuf, file->flags);
1578         }
1579 }
1580
1581
1582 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1583 enum fnc_type { t_PATH, t_ITEM };
1584
1585 /* Compare the names of two file_struct entities, similar to how strcmp()
1586  * would do if it were operating on the joined strings.
1587  *
1588  * Some differences beginning with protocol_version 29: (1) directory names
1589  * are compared with an assumed trailing slash so that they compare in a
1590  * way that would cause them to sort immediately prior to any content they
1591  * may have; (2) a directory of any name compares after a non-directory of
1592  * any name at the same depth; (3) a directory with name "." compares prior
1593  * to anything else.  These changes mean that a directory and a non-dir
1594  * with the same name will not compare as equal (protocol_version >= 29).
1595  *
1596  * The dirname component can be an empty string, but the basename component
1597  * cannot (and never is in the current codebase).  The basename component
1598  * may be NULL (for a removed item), in which case it is considered to be
1599  * after any existing item. */
1600 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1601 {
1602         int dif;
1603         const uchar *c1, *c2;
1604         enum fnc_state state1, state2;
1605         enum fnc_type type1, type2;
1606         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1607
1608         if (!f1 || !f1->basename) {
1609                 if (!f2 || !f2->basename)
1610                         return 0;
1611                 return -1;
1612         }
1613         if (!f2 || !f2->basename)
1614                 return 1;
1615
1616         c1 = (uchar*)f1->dirname;
1617         c2 = (uchar*)f2->dirname;
1618         if (c1 == c2)
1619                 c1 = c2 = NULL;
1620         if (!c1) {
1621                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1622                 c1 = (uchar*)f1->basename;
1623                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1624                         type1 = t_ITEM;
1625                         state1 = s_TRAILING;
1626                         c1 = (uchar*)"";
1627                 } else
1628                         state1 = s_BASE;
1629         } else if (!*c1) {
1630                 type1 = t_path;
1631                 state1 = s_SLASH;
1632                 c1 = (uchar*)"/";
1633         } else {
1634                 type1 = t_path;
1635                 state1 = s_DIR;
1636         }
1637         if (!c2) {
1638                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1639                 c2 = (uchar*)f2->basename;
1640                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1641                         type2 = t_ITEM;
1642                         state2 = s_TRAILING;
1643                         c2 = (uchar*)"";
1644                 } else
1645                         state2 = s_BASE;
1646         } else if (!*c2) {
1647                 type2 = t_path;
1648                 state2 = s_SLASH;
1649                 c2 = (uchar*)"/";
1650         } else {
1651                 type2 = t_path;
1652                 state2 = s_DIR;
1653         }
1654
1655         if (type1 != type2)
1656                 return type1 == t_PATH ? 1 : -1;
1657
1658         while (1) {
1659                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1660                         break;
1661                 if (!*c1) {
1662                         switch (state1) {
1663                         case s_DIR:
1664                                 state1 = s_SLASH;
1665                                 c1 = (uchar*)"/";
1666                                 break;
1667                         case s_SLASH:
1668                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1669                                 state1 = s_BASE;
1670                                 c1 = (uchar*)f1->basename;
1671                                 break;
1672                         case s_BASE:
1673                                 state1 = s_TRAILING;
1674                                 if (type1 == t_PATH) {
1675                                         c1 = (uchar*)"/";
1676                                         break;
1677                                 }
1678                                 /* FALL THROUGH */
1679                         case s_TRAILING:
1680                                 type1 = t_ITEM;
1681                                 break;
1682                         }
1683                         if (*c2 && type1 != type2)
1684                                 return type1 == t_PATH ? 1 : -1;
1685                 }
1686                 if (!*c2) {
1687                         switch (state2) {
1688                         case s_DIR:
1689                                 state2 = s_SLASH;
1690                                 c2 = (uchar*)"/";
1691                                 break;
1692                         case s_SLASH:
1693                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1694                                 state2 = s_BASE;
1695                                 c2 = (uchar*)f2->basename;
1696                                 break;
1697                         case s_BASE:
1698                                 state2 = s_TRAILING;
1699                                 if (type2 == t_PATH) {
1700                                         c2 = (uchar*)"/";
1701                                         break;
1702                                 }
1703                                 /* FALL THROUGH */
1704                         case s_TRAILING:
1705                                 if (!*c1)
1706                                         return 0;
1707                                 type2 = t_ITEM;
1708                                 break;
1709                         }
1710                         if (type1 != type2)
1711                                 return type1 == t_PATH ? 1 : -1;
1712                 }
1713         }
1714
1715         return dif;
1716 }
1717
1718
1719 /* Return a copy of the full filename of a flist entry, using the indicated
1720  * buffer.  No size-checking is done because we checked the size when creating
1721  * the file_struct entry.
1722  */
1723 char *f_name_to(struct file_struct *f, char *fbuf)
1724 {
1725         if (!f || !f->basename)
1726                 return NULL;
1727
1728         if (f->dirname) {
1729                 int len = strlen(f->dirname);
1730                 memcpy(fbuf, f->dirname, len);
1731                 fbuf[len] = '/';
1732                 strcpy(fbuf + len + 1, f->basename);
1733         } else
1734                 strcpy(fbuf, f->basename);
1735         return fbuf;
1736 }
1737
1738
1739 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1740 char *f_name(struct file_struct *f)
1741 {
1742         static char names[5][MAXPATHLEN];
1743         static unsigned int n;
1744
1745         n = (n + 1) % (sizeof names / sizeof names[0]);
1746
1747         return f_name_to(f, names[n]);
1748 }
1749
1750
1751 /* Do a non-recursive scan of the named directory, possibly ignoring all
1752  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1753  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1754  * buffer (the functions we call will append names onto the end, but the old
1755  * dir value will be restored on exit). */
1756 struct file_list *get_dirlist(char *dirname, int dlen,
1757                               int ignore_filter_rules)
1758 {
1759         struct file_list *dirlist;
1760         char dirbuf[MAXPATHLEN];
1761         int save_recurse = recurse;
1762
1763         if (dlen < 0) {
1764                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1765                 if (dlen >= MAXPATHLEN)
1766                         return NULL;
1767                 dirname = dirbuf;
1768         }
1769
1770         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1771
1772         recurse = 0;
1773         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1774         recurse = save_recurse;
1775
1776         clean_flist(dirlist, 0, 0);
1777
1778         if (verbose > 3)
1779                 output_flist(dirlist);
1780
1781         return dirlist;
1782 }