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 int flist_count_offset;
  73 static unsigned int file_struct_len;
  74 static struct file_list *sorting_flist;
  75
  76 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  77 static void output_flist(struct file_list *flist);
  78
  79 void init_flist(void)
  80 {
  81         struct file_struct f;
  82
  83         /* Figure out how big the file_struct is without trailing padding */
  84         file_struct_len = offsetof(struct file_struct, flags) + sizeof f.flags;
  85 }
  86
  87
  88 static int show_filelist_p(void)
  89 {
  90         return verbose && xfer_dirs && !am_server;
  91 }
  92
  93 static void start_filelist_progress(char *kind)
  94 {
  95         rprintf(FINFO, "%s ... ", kind);
  96         if (verbose > 1 || do_progress)
  97                 rprintf(FINFO, "\n");
  98         rflush(FINFO);
  99 }
 100
 101
 102 static void emit_filelist_progress(int count)
 103 {
 104         rprintf(FINFO, " %d files...\r", count);
 105 }
 106
 107
 108 static void maybe_emit_filelist_progress(int count)
 109 {
 110         if (do_progress && show_filelist_p() && (count % 100) == 0)
 111                 emit_filelist_progress(count);
 112 }
 113
 114
 115 static void finish_filelist_progress(const struct file_list *flist)
 116 {
 117         if (do_progress) {
 118                 /* This overwrites the progress line */
 119                 rprintf(FINFO, "%d file%sto consider\n",
 120                         flist->count, flist->count == 1 ? " " : "s ");
 121         } else
 122                 rprintf(FINFO, "done\n");
 123 }
 124
 125 void show_flist_stats(void)
 126 {
 127         /* Nothing yet */
 128 }
 129
 130
 131 static void list_file_entry(struct file_struct *f)
 132 {
 133         char perms[11];
 134
 135         if (!f->basename) {
 136                 /* this can happen if duplicate names were removed */
 137                 return;
 138         }
 139
 140         permstring(perms, f->mode);
 141
 142 #ifdef SUPPORT_LINKS
 143         if (preserve_links && S_ISLNK(f->mode)) {
 144                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 145                         perms,
 146                         (double)f->length, timestring(f->modtime),
 147                         safe_fname(f_name(f)), safe_fname(f->u.link));
 148         } else
 149 #endif
 150         {
 151                 rprintf(FINFO, "%s %11.0f %s %s\n",
 152                         perms,
 153                         (double)f->length, timestring(f->modtime),
 154                         safe_fname(f_name(f)));
 155         }
 156 }
 157
 158
 159 /**
 160  * Stat either a symlink or its referent, depending on the settings of
 161  * copy_links, copy_unsafe_links, etc.
 162  *
 163  * @retval -1 on error
 164  *
 165  * @retval 0 for success
 166  *
 167  * @post If @p path is a symlink, then @p linkbuf (of size @c
 168  * MAXPATHLEN) contains the symlink target.
 169  *
 170  * @post @p buffer contains information about the link or the
 171  * referrent as appropriate, if they exist.
 172  **/
 173 static int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 174 {
 175 #ifdef SUPPORT_LINKS
 176         if (copy_links)
 177                 return do_stat(path, buffer);
 178         if (link_stat(path, buffer, 0) < 0)
 179                 return -1;
 180         if (S_ISLNK(buffer->st_mode)) {
 181                 int l = readlink((char *)path, linkbuf, MAXPATHLEN - 1);
 182                 if (l == -1)
 183                         return -1;
 184                 linkbuf[l] = 0;
 185                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 186                         if (verbose > 1) {
 187                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 188                                         safe_fname(path), safe_fname(linkbuf));
 189                         }
 190                         return do_stat(path, buffer);
 191                 }
 192         }
 193         return 0;
 194 #else
 195         return do_stat(path, buffer);
 196 #endif
 197 }
 198
 199 int link_stat(const char *path, STRUCT_STAT *buffer, int follow_dirlinks)
 200 {
 201 #ifdef SUPPORT_LINKS
 202         if (copy_links)
 203                 return do_stat(path, buffer);
 204         if (do_lstat(path, buffer) < 0)
 205                 return -1;
 206         if (follow_dirlinks && S_ISLNK(buffer->st_mode)) {
 207                 STRUCT_STAT st;
 208                 if (do_stat(path, &st) == 0 && S_ISDIR(st.st_mode))
 209                         *buffer = st;
 210         }
 211         return 0;
 212 #else
 213         return do_stat(path, buffer);
 214 #endif
 215 }
 216
 217 /* This function is used to check if a file should be included/excluded
 218  * from the list of files based on its name and type etc.  The value of
 219  * filter_level is set to either SERVER_FILTERS or ALL_FILTERS. */
 220 static int is_excluded(char *fname, int is_dir, int filter_level)
 221 {
 222 #if 0 /* This currently never happens, so avoid a useless compare. */
 223         if (filter_level == NO_FILTERS)
 224                 return 0;
 225 #endif
 226         if (fname) {
 227                 /* never exclude '.', even if somebody does --exclude '*' */
 228                 if (fname[0] == '.' && !fname[1])
 229                         return 0;
 230                 /* Handle the -R version of the '.' dir. */
 231                 if (fname[0] == '/') {
 232                         int len = strlen(fname);
 233                         if (fname[len-1] == '.' && fname[len-2] == '/')
 234                                 return 0;
 235                 }
 236         }
 237         if (server_filter_list.head
 238             && check_filter(&server_filter_list, fname, is_dir) < 0)
 239                 return 1;
 240         if (filter_level != ALL_FILTERS)
 241                 return 0;
 242         if (filter_list.head
 243             && check_filter(&filter_list, fname, is_dir) < 0)
 244                 return 1;
 245         return 0;
 246 }
 247
 248 static int to_wire_mode(mode_t mode)
 249 {
 250 #ifdef SUPPORT_LINKS
 251         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 252                 return (mode & ~(_S_IFMT)) | 0120000;
 253 #endif
 254         return (int)mode;
 255 }
 256
 257 static mode_t from_wire_mode(int mode)
 258 {
 259         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 260                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 261         return (mode_t)mode;
 262 }
 263
 264
 265 static void send_directory(int f, struct file_list *flist,
 266                            char *fbuf, int len);
 267
 268 static char *flist_dir;
 269 static int flist_dir_len;
 270
 271
 272 /**
 273  * Make sure @p flist is big enough to hold at least @p flist->count
 274  * entries.
 275  **/
 276 void flist_expand(struct file_list *flist)
 277 {
 278         struct file_struct **new_ptr;
 279
 280         if (flist->count < flist->malloced)
 281                 return;
 282
 283         if (flist->malloced < FLIST_START)
 284                 flist->malloced = FLIST_START;
 285         else if (flist->malloced >= FLIST_LINEAR)
 286                 flist->malloced += FLIST_LINEAR;
 287         else
 288                 flist->malloced *= 2;
 289
 290         /*
 291          * In case count jumped or we are starting the list
 292          * with a known size just set it.
 293          */
 294         if (flist->malloced < flist->count)
 295                 flist->malloced = flist->count;
 296
 297         new_ptr = realloc_array(flist->files, struct file_struct *,
 298                                 flist->malloced);
 299
 300         if (verbose >= 2 && flist->malloced != FLIST_START) {
 301                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 302                     who_am_i(),
 303                     (double)sizeof flist->files[0] * flist->malloced,
 304                     (new_ptr == flist->files) ? " not" : "");
 305         }
 306
 307         flist->files = new_ptr;
 308
 309         if (!flist->files)
 310                 out_of_memory("flist_expand");
 311 }
 312
 313 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 314 {
 315         unsigned short flags;
 316         static time_t modtime;
 317         static mode_t mode;
 318         static int64 dev;
 319         static dev_t rdev;
 320         static uint32 rdev_major;
 321         static uid_t uid;
 322         static gid_t gid;
 323         static char lastname[MAXPATHLEN];
 324         char fname[MAXPATHLEN];
 325         int l1, l2;
 326
 327         if (f < 0)
 328                 return;
 329
 330         if (!file) {
 331                 write_byte(f, 0);
 332                 modtime = 0, mode = 0;
 333                 dev = 0, rdev = makedev(0, 0);
 334                 rdev_major = 0;
 335                 uid = 0, gid = 0;
 336                 *lastname = '\0';
 337                 return;
 338         }
 339
 340         io_write_phase = "send_file_entry";
 341
 342         f_name_to(file, fname);
 343
 344         flags = base_flags;
 345
 346         if (file->mode == mode)
 347                 flags |= XMIT_SAME_MODE;
 348         else
 349                 mode = file->mode;
 350         if (preserve_devices) {
 351                 if (protocol_version < 28) {
 352                         if (IS_DEVICE(mode)) {
 353                                 if (file->u.rdev == rdev)
 354                                         flags |= XMIT_SAME_RDEV_pre28;
 355                                 else
 356                                         rdev = file->u.rdev;
 357                         } else
 358                                 rdev = makedev(0, 0);
 359                 } else if (IS_DEVICE(mode)) {
 360                         rdev = file->u.rdev;
 361                         if ((uint32)major(rdev) == rdev_major)
 362                                 flags |= XMIT_SAME_RDEV_MAJOR;
 363                         else
 364                                 rdev_major = major(rdev);
 365                         if ((uint32)minor(rdev) <= 0xFFu)
 366                                 flags |= XMIT_RDEV_MINOR_IS_SMALL;
 367                 }
 368         }
 369         if (file->uid == uid)
 370                 flags |= XMIT_SAME_UID;
 371         else
 372                 uid = file->uid;
 373         if (file->gid == gid)
 374                 flags |= XMIT_SAME_GID;
 375         else
 376                 gid = file->gid;
 377         if (file->modtime == modtime)
 378                 flags |= XMIT_SAME_TIME;
 379         else
 380                 modtime = file->modtime;
 381
 382 #ifdef SUPPORT_HARD_LINKS
 383         if (file->link_u.idev) {
 384                 if (file->F_DEV == dev) {
 385                         if (protocol_version >= 28)
 386                                 flags |= XMIT_SAME_DEV;
 387                 } else
 388                         dev = file->F_DEV;
 389                 flags |= XMIT_HAS_IDEV_DATA;
 390         }
 391 #endif
 392
 393         for (l1 = 0;
 394             lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 395             l1++) {}
 396         l2 = strlen(fname+l1);
 397
 398         if (l1 > 0)
 399                 flags |= XMIT_SAME_NAME;
 400         if (l2 > 255)
 401                 flags |= XMIT_LONG_NAME;
 402
 403         /* We must make sure we don't send a zero flag byte or the
 404          * other end will terminate the flist transfer.  Note that
 405          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 406          * it's harmless way to add a bit to the first flag byte. */
 407         if (protocol_version >= 28) {
 408                 if (!flags && !S_ISDIR(mode))
 409                         flags |= XMIT_TOP_DIR;
 410                 if ((flags & 0xFF00) || !flags) {
 411                         flags |= XMIT_EXTENDED_FLAGS;
 412                         write_byte(f, flags);
 413                         write_byte(f, flags >> 8);
 414                 } else
 415                         write_byte(f, flags);
 416         } else {
 417                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 418                         flags |= XMIT_TOP_DIR;
 419                 if (!(flags & 0xFF))
 420                         flags |= XMIT_LONG_NAME;
 421                 write_byte(f, flags);
 422         }
 423         if (flags & XMIT_SAME_NAME)
 424                 write_byte(f, l1);
 425         if (flags & XMIT_LONG_NAME)
 426                 write_int(f, l2);
 427         else
 428                 write_byte(f, l2);
 429         write_buf(f, fname + l1, l2);
 430
 431         write_longint(f, file->length);
 432         if (!(flags & XMIT_SAME_TIME))
 433                 write_int(f, modtime);
 434         if (!(flags & XMIT_SAME_MODE))
 435                 write_int(f, to_wire_mode(mode));
 436         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 437                 if (!numeric_ids)
 438                         add_uid(uid);
 439                 write_int(f, uid);
 440         }
 441         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 442                 if (!numeric_ids)
 443                         add_gid(gid);
 444                 write_int(f, gid);
 445         }
 446         if (preserve_devices && IS_DEVICE(mode)) {
 447                 if (protocol_version < 28) {
 448                         if (!(flags & XMIT_SAME_RDEV_pre28))
 449                                 write_int(f, (int)rdev);
 450                 } else {
 451                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 452                                 write_int(f, major(rdev));
 453                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 454                                 write_byte(f, minor(rdev));
 455                         else
 456                                 write_int(f, minor(rdev));
 457                 }
 458         }
 459
 460 #ifdef SUPPORT_LINKS
 461         if (preserve_links && S_ISLNK(mode)) {
 462                 int len = strlen(file->u.link);
 463                 write_int(f, len);
 464                 write_buf(f, file->u.link, len);
 465         }
 466 #endif
 467
 468 #ifdef SUPPORT_HARD_LINKS
 469         if (flags & XMIT_HAS_IDEV_DATA) {
 470                 if (protocol_version < 26) {
 471                         /* 32-bit dev_t and ino_t */
 472                         write_int(f, dev);
 473                         write_int(f, file->F_INODE);
 474                 } else {
 475                         /* 64-bit dev_t and ino_t */
 476                         if (!(flags & XMIT_SAME_DEV))
 477                                 write_longint(f, dev);
 478                         write_longint(f, file->F_INODE);
 479                 }
 480         }
 481 #endif
 482
 483         if (always_checksum) {
 484                 char *sum;
 485                 if (S_ISREG(mode))
 486                         sum = file->u.sum;
 487                 else if (protocol_version < 28) {
 488                         /* Prior to 28, we sent a useless set of nulls. */
 489                         sum = empty_sum;
 490                 } else
 491                         sum = NULL;
 492                 if (sum) {
 493                         write_buf(f, sum,
 494                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 495                 }
 496         }
 497
 498         strlcpy(lastname, fname, MAXPATHLEN);
 499
 500         io_write_phase = "unknown";
 501 }
 502
 503
 504
 505 static struct file_struct *receive_file_entry(struct file_list *flist,
 506                                               unsigned short flags, int f)
 507 {
 508         static time_t modtime;
 509         static mode_t mode;
 510         static int64 dev;
 511         static dev_t rdev;
 512         static uint32 rdev_major;
 513         static uid_t uid;
 514         static gid_t gid;
 515         static char lastname[MAXPATHLEN], *lastdir;
 516         static int lastdir_depth, lastdir_len = -1;
 517         static unsigned int del_hier_name_len = 0;
 518         static int in_del_hier = 0;
 519         char thisname[MAXPATHLEN];
 520         unsigned int l1 = 0, l2 = 0;
 521         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 522         OFF_T file_length;
 523         char *basename, *dirname, *bp;
 524         struct file_struct *file;
 525
 526         if (!flist) {
 527                 modtime = 0, mode = 0;
 528                 dev = 0, rdev = makedev(0, 0);
 529                 rdev_major = 0;
 530                 uid = 0, gid = 0;
 531                 *lastname = '\0';
 532                 lastdir_len = -1;
 533                 in_del_hier = 0;
 534                 return NULL;
 535         }
 536
 537         if (flags & XMIT_SAME_NAME)
 538                 l1 = read_byte(f);
 539
 540         if (flags & XMIT_LONG_NAME)
 541                 l2 = read_int(f);
 542         else
 543                 l2 = read_byte(f);
 544
 545         if (l2 >= MAXPATHLEN - l1) {
 546                 rprintf(FERROR,
 547                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 548                         flags, l1, l2, safe_fname(lastname));
 549                 overflow_exit("receive_file_entry");
 550         }
 551
 552         strlcpy(thisname, lastname, l1 + 1);
 553         read_sbuf(f, &thisname[l1], l2);
 554         thisname[l1 + l2] = 0;
 555
 556         strlcpy(lastname, thisname, MAXPATHLEN);
 557
 558         clean_fname(thisname, 0);
 559
 560         if (sanitize_paths)
 561                 sanitize_path(thisname, thisname, "", 0);
 562
 563         if ((basename = strrchr(thisname, '/')) != NULL) {
 564                 dirname_len = ++basename - thisname; /* counts future '\0' */
 565                 if (lastdir_len == dirname_len - 1
 566                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 567                         dirname = lastdir;
 568                         dirname_len = 0; /* indicates no copy is needed */
 569                 } else
 570                         dirname = thisname;
 571         } else {
 572                 basename = thisname;
 573                 dirname = NULL;
 574                 dirname_len = 0;
 575         }
 576         basename_len = strlen(basename) + 1; /* count the '\0' */
 577
 578         file_length = read_longint(f);
 579         if (!(flags & XMIT_SAME_TIME))
 580                 modtime = (time_t)read_int(f);
 581         if (!(flags & XMIT_SAME_MODE))
 582                 mode = from_wire_mode(read_int(f));
 583
 584         if (preserve_uid && !(flags & XMIT_SAME_UID))
 585                 uid = (uid_t)read_int(f);
 586         if (preserve_gid && !(flags & XMIT_SAME_GID))
 587                 gid = (gid_t)read_int(f);
 588
 589         if (preserve_devices) {
 590                 if (protocol_version < 28) {
 591                         if (IS_DEVICE(mode)) {
 592                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 593                                         rdev = (dev_t)read_int(f);
 594                         } else
 595                                 rdev = makedev(0, 0);
 596                 } else if (IS_DEVICE(mode)) {
 597                         uint32 rdev_minor;
 598                         if (!(flags & XMIT_SAME_RDEV_MAJOR))
 599                                 rdev_major = read_int(f);
 600                         if (flags & XMIT_RDEV_MINOR_IS_SMALL)
 601                                 rdev_minor = read_byte(f);
 602                         else
 603                                 rdev_minor = read_int(f);
 604                         rdev = makedev(rdev_major, rdev_minor);
 605                 }
 606         }
 607
 608 #ifdef SUPPORT_LINKS
 609         if (preserve_links && S_ISLNK(mode)) {
 610                 linkname_len = read_int(f) + 1; /* count the '\0' */
 611                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 612                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 613                                 linkname_len - 1);
 614                         overflow_exit("receive_file_entry");
 615                 }
 616         }
 617         else
 618 #endif
 619                 linkname_len = 0;
 620
 621         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 622
 623         alloc_len = file_struct_len + dirname_len + basename_len
 624                   + linkname_len + sum_len;
 625         bp = pool_alloc(flist->file_pool, alloc_len, "receive_file_entry");
 626
 627         file = (struct file_struct *)bp;
 628         memset(bp, 0, file_struct_len);
 629         bp += file_struct_len;
 630
 631         file->flags = 0;
 632         file->modtime = modtime;
 633         file->length = file_length;
 634         file->mode = mode;
 635         file->uid = uid;
 636         file->gid = gid;
 637
 638         if (dirname_len) {
 639                 file->dirname = lastdir = bp;
 640                 lastdir_len = dirname_len - 1;
 641                 memcpy(bp, dirname, dirname_len - 1);
 642                 bp += dirname_len;
 643                 bp[-1] = '\0';
 644                 lastdir_depth = count_dir_elements(lastdir);
 645                 file->dir.depth = lastdir_depth + 1;
 646         } else if (dirname) {
 647                 file->dirname = dirname; /* we're reusing lastname */
 648                 file->dir.depth = lastdir_depth + 1;
 649         } else
 650                 file->dir.depth = 1;
 651
 652         if (S_ISDIR(mode)) {
 653                 if (basename_len == 1+1 && *basename == '.') /* +1 for '\0' */
 654                         file->dir.depth--;
 655                 if (flags & XMIT_TOP_DIR) {
 656                         in_del_hier = 1;
 657                         del_hier_name_len = file->dir.depth == 0 ? 0 : l1 + l2;
 658                         if (relative_paths && del_hier_name_len > 2
 659                             && basename_len == 1+1 && *basename == '.')
 660                                 del_hier_name_len -= 2;
 661                         file->flags |= FLAG_TOP_DIR | FLAG_DEL_HERE;
 662                 } else if (in_del_hier) {
 663                         if (!relative_paths || !del_hier_name_len
 664                          || (l1 >= del_hier_name_len
 665                           && thisname[del_hier_name_len] == '/'))
 666                                 file->flags |= FLAG_DEL_HERE;
 667                         else
 668                                 in_del_hier = 0;
 669                 }
 670         }
 671
 672         file->basename = bp;
 673         memcpy(bp, basename, basename_len);
 674         bp += basename_len;
 675
 676         if (preserve_devices && IS_DEVICE(mode))
 677                 file->u.rdev = rdev;
 678
 679 #ifdef SUPPORT_LINKS
 680         if (linkname_len) {
 681                 file->u.link = bp;
 682                 read_sbuf(f, bp, linkname_len - 1);
 683                 if (sanitize_paths)
 684                         sanitize_path(bp, bp, "", lastdir_depth);
 685                 bp += linkname_len;
 686         }
 687 #endif
 688
 689 #ifdef SUPPORT_HARD_LINKS
 690         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 691                 flags |= XMIT_HAS_IDEV_DATA;
 692         if (flags & XMIT_HAS_IDEV_DATA) {
 693                 int64 inode;
 694                 if (protocol_version < 26) {
 695                         dev = read_int(f);
 696                         inode = read_int(f);
 697                 } else {
 698                         if (!(flags & XMIT_SAME_DEV))
 699                                 dev = read_longint(f);
 700                         inode = read_longint(f);
 701                 }
 702                 if (flist->hlink_pool) {
 703                         file->link_u.idev = pool_talloc(flist->hlink_pool,
 704                             struct idev, 1, "inode_table");
 705                         file->F_INODE = inode;
 706                         file->F_DEV = dev;
 707                 }
 708         }
 709 #endif
 710
 711         if (always_checksum) {
 712                 char *sum;
 713                 if (sum_len) {
 714                         file->u.sum = sum = bp;
 715                         /*bp += sum_len;*/
 716                 } else if (protocol_version < 28) {
 717                         /* Prior to 28, we get a useless set of nulls. */
 718                         sum = empty_sum;
 719                 } else
 720                         sum = NULL;
 721                 if (sum) {
 722                         read_buf(f, sum,
 723                             protocol_version < 21 ? 2 : MD4_SUM_LENGTH);
 724                 }
 725         }
 726
 727         if (!preserve_perms) {
 728                 /* set an appropriate set of permissions based on original
 729                  * permissions and umask. This emulates what GNU cp does */
 730                 file->mode &= ~orig_umask;
 731         }
 732
 733         return file;
 734 }
 735
 736
 737 /**
 738  * Create a file_struct for a named file by reading its stat()
 739  * information and performing extensive checks against global
 740  * options.
 741  *
 742  * @return the new file, or NULL if there was an error or this file
 743  * should be excluded.
 744  *
 745  * @todo There is a small optimization opportunity here to avoid
 746  * stat()ing the file in some circumstances, which has a certain cost.
 747  * We are called immediately after doing readdir(), and so we may
 748  * already know the d_type of the file.  We could for example avoid
 749  * statting directories if we're not recursing, but this is not a very
 750  * important case.  Some systems may not have d_type.
 751  **/
 752 struct file_struct *make_file(char *fname, struct file_list *flist,
 753                               int filter_level)
 754 {
 755         static char *lastdir;
 756         static int lastdir_len = -1;
 757         struct file_struct *file;
 758         STRUCT_STAT st;
 759         char sum[SUM_LENGTH];
 760         char thisname[MAXPATHLEN];
 761         char linkname[MAXPATHLEN];
 762         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 763         char *basename, *dirname, *bp;
 764         unsigned short flags = 0;
 765
 766         if (!flist || !flist->count)    /* Ignore lastdir when invalid. */
 767                 lastdir_len = -1;
 768
 769         if (strlcpy(thisname, fname, sizeof thisname)
 770             >= sizeof thisname - flist_dir_len) {
 771                 rprintf(FINFO, "skipping overly long name: %s\n",
 772                         safe_fname(fname));
 773                 return NULL;
 774         }
 775         clean_fname(thisname, 0);
 776         if (sanitize_paths)
 777                 sanitize_path(thisname, thisname, "", 0);
 778
 779         memset(sum, 0, SUM_LENGTH);
 780
 781         if (readlink_stat(thisname, &st, linkname) != 0) {
 782                 int save_errno = errno;
 783                 /* See if file is excluded before reporting an error. */
 784                 if (filter_level != NO_FILTERS
 785                     && is_excluded(thisname, 0, filter_level))
 786                         return NULL;
 787                 if (save_errno == ENOENT) {
 788 #ifdef SUPPORT_LINKS
 789                         /* Avoid "vanished" error if symlink points nowhere. */
 790                         if (copy_links && do_lstat(thisname, &st) == 0
 791                             && S_ISLNK(st.st_mode)) {
 792                                 io_error |= IOERR_GENERAL;
 793                                 rprintf(FERROR, "symlink has no referent: %s\n",
 794                                         full_fname(thisname));
 795                         } else
 796 #endif
 797                         {
 798                                 enum logcode c = am_daemon && protocol_version < 28
 799                                     ? FERROR : FINFO;
 800                                 io_error |= IOERR_VANISHED;
 801                                 rprintf(c, "file has vanished: %s\n",
 802                                         full_fname(thisname));
 803                         }
 804                 } else {
 805                         io_error |= IOERR_GENERAL;
 806                         rsyserr(FERROR, save_errno, "readlink %s failed",
 807                                 full_fname(thisname));
 808                 }
 809                 return NULL;
 810         }
 811
 812         /* backup.c calls us with filter_level set to NO_FILTERS. */
 813         if (filter_level == NO_FILTERS)
 814                 goto skip_filters;
 815
 816         if (S_ISDIR(st.st_mode) && !xfer_dirs) {
 817                 rprintf(FINFO, "skipping directory %s\n", safe_fname(thisname));
 818                 return NULL;
 819         }
 820
 821         /* We only care about directories because we need to avoid recursing
 822          * into a mount-point directory, not to avoid copying a symlinked
 823          * file if -L (or similar) was specified. */
 824         if (one_file_system && st.st_dev != filesystem_dev
 825             && S_ISDIR(st.st_mode))
 826                 flags |= FLAG_MOUNT_POINT;
 827
 828         if (is_excluded(thisname, S_ISDIR(st.st_mode) != 0, filter_level))
 829                 return NULL;
 830
 831         if (lp_ignore_nonreadable(module_id)) {
 832 #ifdef SUPPORT_LINKS
 833                 if (!S_ISLNK(st.st_mode))
 834 #endif
 835                         if (access(thisname, R_OK) != 0)
 836                                 return NULL;
 837         }
 838
 839 skip_filters:
 840
 841         if (verbose > 2) {
 842                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 843                         who_am_i(), safe_fname(thisname), filter_level);
 844         }
 845
 846         if ((basename = strrchr(thisname, '/')) != NULL) {
 847                 dirname_len = ++basename - thisname; /* counts future '\0' */
 848                 if (lastdir_len == dirname_len - 1
 849                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 850                         dirname = lastdir;
 851                         dirname_len = 0; /* indicates no copy is needed */
 852                 } else
 853                         dirname = thisname;
 854         } else {
 855                 basename = thisname;
 856                 dirname = NULL;
 857                 dirname_len = 0;
 858         }
 859         basename_len = strlen(basename) + 1; /* count the '\0' */
 860
 861 #ifdef SUPPORT_LINKS
 862         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 863 #else
 864         linkname_len = 0;
 865 #endif
 866
 867         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 868
 869         alloc_len = file_struct_len + dirname_len + basename_len
 870             + linkname_len + sum_len;
 871         if (flist) {
 872                 bp = pool_alloc(flist->file_pool, alloc_len,
 873                     "receive_file_entry");
 874         } else {
 875                 if (!(bp = new_array(char, alloc_len)))
 876                         out_of_memory("receive_file_entry");
 877         }
 878
 879         file = (struct file_struct *)bp;
 880         memset(bp, 0, file_struct_len);
 881         bp += file_struct_len;
 882
 883         file->flags = flags;
 884         file->modtime = st.st_mtime;
 885         file->length = st.st_size;
 886         file->mode = st.st_mode;
 887         file->uid = st.st_uid;
 888         file->gid = st.st_gid;
 889
 890 #ifdef SUPPORT_HARD_LINKS
 891         if (flist && flist->hlink_pool) {
 892                 if (protocol_version < 28) {
 893                         if (S_ISREG(st.st_mode))
 894                                 file->link_u.idev = pool_talloc(
 895                                     flist->hlink_pool, struct idev, 1,
 896                                     "inode_table");
 897                 } else {
 898                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 899                                 file->link_u.idev = pool_talloc(
 900                                     flist->hlink_pool, struct idev, 1,
 901                                     "inode_table");
 902                 }
 903         }
 904         if (file->link_u.idev) {
 905                 file->F_DEV = st.st_dev;
 906                 file->F_INODE = st.st_ino;
 907         }
 908 #endif
 909
 910         if (dirname_len) {
 911                 file->dirname = lastdir = bp;
 912                 lastdir_len = dirname_len - 1;
 913                 memcpy(bp, dirname, dirname_len - 1);
 914                 bp += dirname_len;
 915                 bp[-1] = '\0';
 916         } else if (dirname)
 917                 file->dirname = dirname;
 918
 919         file->basename = bp;
 920         memcpy(bp, basename, basename_len);
 921         bp += basename_len;
 922
 923 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 924         if (preserve_devices && IS_DEVICE(st.st_mode))
 925                 file->u.rdev = st.st_rdev;
 926 #endif
 927
 928 #ifdef SUPPORT_LINKS
 929         if (linkname_len) {
 930                 file->u.link = bp;
 931                 memcpy(bp, linkname, linkname_len);
 932                 bp += linkname_len;
 933         }
 934 #endif
 935
 936         if (sum_len) {
 937                 file->u.sum = bp;
 938                 file_checksum(thisname, bp, st.st_size);
 939                 /*bp += sum_len;*/
 940         }
 941
 942         file->dir.root = flist_dir;
 943
 944         /* This code is only used by the receiver when it is building
 945          * a list of files for a delete pass. */
 946         if (keep_dirlinks && linkname_len && flist) {
 947                 STRUCT_STAT st2;
 948                 int save_mode = file->mode;
 949                 file->mode = S_IFDIR; /* find a directory w/our name */
 950                 if (flist_find(the_file_list, file) >= 0
 951                     && do_stat(thisname, &st2) == 0 && S_ISDIR(st2.st_mode)) {
 952                         file->modtime = st2.st_mtime;
 953                         file->length = st2.st_size;
 954                         file->mode = st2.st_mode;
 955                         file->uid = st2.st_uid;
 956                         file->gid = st2.st_gid;
 957                         file->u.link = NULL;
 958                 } else
 959                         file->mode = save_mode;
 960         }
 961
 962         if (S_ISREG(st.st_mode) || S_ISLNK(st.st_mode))
 963                 stats.total_size += st.st_size;
 964
 965         return file;
 966 }
 967
 968
 969 static struct file_struct *send_file_name(int f, struct file_list *flist,
 970                                           char *fname, unsigned short base_flags)
 971 {
 972         struct file_struct *file;
 973
 974         file = make_file(fname, flist, f == -2 ? SERVER_FILTERS : ALL_FILTERS);
 975         if (!file)
 976                 return NULL;
 977
 978         maybe_emit_filelist_progress(flist->count + flist_count_offset);
 979
 980         flist_expand(flist);
 981
 982         if (file->basename[0]) {
 983                 flist->files[flist->count++] = file;
 984                 send_file_entry(file, f, base_flags);
 985         }
 986         return file;
 987 }
 988
 989 static void send_if_directory(int f, struct file_list *flist,
 990                               struct file_struct *file)
 991 {
 992         char fbuf[MAXPATHLEN];
 993
 994         if (S_ISDIR(file->mode)
 995             && !(file->flags & FLAG_MOUNT_POINT) && f_name_to(file, fbuf)) {
 996                 void *save_filters;
 997                 unsigned int len = strlen(fbuf);
 998                 if (len > 1 && fbuf[len-1] == '/')
 999                         fbuf[--len] = '\0';
1000                 if (len >= MAXPATHLEN - 1) {
1001                         io_error |= IOERR_GENERAL;
1002                         rprintf(FERROR, "skipping long-named directory: %s\n",
1003                                 full_fname(fbuf));
1004                         return;
1005                 }
1006                 save_filters = push_local_filters(fbuf, len);
1007                 send_directory(f, flist, fbuf, len);
1008                 pop_local_filters(save_filters);
1009         }
1010 }
1011
1012
1013 /* This function is normally called by the sender, but the receiving side also
1014  * calls it from get_dirlist() with f set to -1 so that we just construct the
1015  * file list in memory without sending it over the wire.  Also, get_dirlist()
1016  * might call this with f set to -2, which also indicates that local filter
1017  * rules should be ignored. */
1018 static void send_directory(int f, struct file_list *flist,
1019                            char *fbuf, int len)
1020 {
1021         struct dirent *di;
1022         unsigned remainder;
1023         char *p;
1024         DIR *d;
1025         int start = flist->count;
1026
1027         if (!(d = opendir(fbuf))) {
1028                 io_error |= IOERR_GENERAL;
1029                 rsyserr(FERROR, errno, "opendir %s failed", full_fname(fbuf));
1030                 return;
1031         }
1032
1033         p = fbuf + len;
1034         if (len != 1 || *fbuf != '/')
1035                 *p++ = '/';
1036         *p = '\0';
1037         remainder = MAXPATHLEN - (p - fbuf);
1038
1039         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
1040                 char *dname = d_name(di);
1041                 if (dname[0] == '.' && (dname[1] == '\0'
1042                     || (dname[1] == '.' && dname[2] == '\0')))
1043                         continue;
1044                 if (strlcpy(p, dname, remainder) < remainder)
1045                         send_file_name(f, flist, fbuf, 0);
1046                 else {
1047                         io_error |= IOERR_GENERAL;
1048                         rprintf(FINFO,
1049                                 "cannot send long-named file %s\n",
1050                                 full_fname(fbuf));
1051                 }
1052         }
1053
1054         fbuf[len] = '\0';
1055
1056         if (errno) {
1057                 io_error |= IOERR_GENERAL;
1058                 rsyserr(FERROR, errno, "readdir(%s)", full_fname(fbuf));
1059         }
1060
1061         closedir(d);
1062
1063         if (recurse) {
1064                 int i, end = flist->count - 1;
1065                 for (i = start; i <= end; i++)
1066                         send_if_directory(f, flist, flist->files[i]);
1067         }
1068 }
1069
1070
1071 struct file_list *send_file_list(int f, int argc, char *argv[])
1072 {
1073         int l;
1074         STRUCT_STAT st;
1075         char *p, *dir, olddir[sizeof curr_dir];
1076         char lastpath[MAXPATHLEN] = "";
1077         struct file_list *flist;
1078         struct timeval start_tv, end_tv;
1079         int64 start_write;
1080         int use_ff_fd = 0;
1081
1082         if (show_filelist_p())
1083                 start_filelist_progress("building file list");
1084
1085         start_write = stats.total_written;
1086         gettimeofday(&start_tv, NULL);
1087
1088         flist = flist_new(WITH_HLINK, "send_file_list");
1089
1090         io_start_buffering_out();
1091         if (filesfrom_fd >= 0) {
1092                 if (argv[0] && !push_dir(argv[0])) {
1093                         rsyserr(FERROR, errno, "push_dir %s failed",
1094                                 full_fname(argv[0]));
1095                         exit_cleanup(RERR_FILESELECT);
1096                 }
1097                 use_ff_fd = 1;
1098         }
1099
1100         while (1) {
1101                 struct file_struct *file;
1102                 char fname2[MAXPATHLEN];
1103                 char *fname = fname2;
1104                 int is_dot_dir;
1105
1106                 if (use_ff_fd) {
1107                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1108                                 break;
1109                         sanitize_path(fname, fname, "", 0);
1110                 } else {
1111                         if (argc-- == 0)
1112                                 break;
1113                         strlcpy(fname, *argv++, MAXPATHLEN);
1114                         if (sanitize_paths)
1115                                 sanitize_path(fname, fname, "", 0);
1116                 }
1117
1118                 l = strlen(fname);
1119                 if (!l || fname[l - 1] == '/') {
1120                         if (l == 2 && fname[0] == '.') {
1121                                 /* Turn "./" into just "." rather than "./." */
1122                                 fname[1] = '\0';
1123                         } else {
1124                                 if (l + 1 >= MAXPATHLEN)
1125                                         overflow_exit("send_file_list");
1126                                 fname[l++] = '.';
1127                                 fname[l] = '\0';
1128                         }
1129                         is_dot_dir = 1;
1130                 } else if (l > 1 && fname[l-1] == '.' && fname[l-2] == '.'
1131                     && (l == 2 || fname[l-3] == '/')) {
1132                         if (l + 2 >= MAXPATHLEN)
1133                                 overflow_exit("send_file_list");
1134                         fname[l++] = '/';
1135                         fname[l++] = '.';
1136                         fname[l] = '\0';
1137                         is_dot_dir = 1;
1138                 } else {
1139                         is_dot_dir = fname[l-1] == '.'
1140                                    && (l == 1 || fname[l-2] == '/');
1141                 }
1142
1143                 if (link_stat(fname, &st, keep_dirlinks) != 0) {
1144                         io_error |= IOERR_GENERAL;
1145                         rsyserr(FERROR, errno, "link_stat %s failed",
1146                                 full_fname(fname));
1147                         continue;
1148                 }
1149
1150                 if (S_ISDIR(st.st_mode) && !xfer_dirs) {
1151                         rprintf(FINFO, "skipping directory %s\n",
1152                                 safe_fname(fname));
1153                         continue;
1154                 }
1155
1156                 dir = NULL;
1157                 olddir[0] = '\0';
1158
1159                 if (!relative_paths) {
1160                         p = strrchr(fname, '/');
1161                         if (p) {
1162                                 *p = '\0';
1163                                 if (p == fname)
1164                                         dir = "/";
1165                                 else
1166                                         dir = fname;
1167                                 fname = p + 1;
1168                         }
1169                 } else if (implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1170                         /* Send the implied directories at the start of the
1171                          * source spec, so we get their permissions right. */
1172                         char *lp = lastpath, *fn = fname, *slash = fname;
1173                         *p = '\0';
1174                         /* Skip any initial directories in our path that we
1175                          * have in common with lastpath. */
1176                         while (*fn && *lp == *fn) {
1177                                 if (*fn == '/')
1178                                         slash = fn;
1179                                 lp++, fn++;
1180                         }
1181                         *p = '/';
1182                         if (fn != p || (*lp && *lp != '/')) {
1183                                 int save_copy_links = copy_links;
1184                                 int save_xfer_dirs = xfer_dirs;
1185                                 copy_links = copy_unsafe_links;
1186                                 xfer_dirs = 1;
1187                                 while ((slash = strchr(slash+1, '/')) != 0) {
1188                                         *slash = '\0';
1189                                         send_file_name(f, flist, fname, 0);
1190                                         *slash = '/';
1191                                 }
1192                                 copy_links = save_copy_links;
1193                                 xfer_dirs = save_xfer_dirs;
1194                                 *p = '\0';
1195                                 strlcpy(lastpath, fname, sizeof lastpath);
1196                                 *p = '/';
1197                         }
1198                 }
1199
1200                 if (!*fname)
1201                         fname = ".";
1202
1203                 if (dir && *dir) {
1204                         static char *lastdir;
1205                         static int lastdir_len;
1206
1207                         strcpy(olddir, curr_dir); /* can't overflow */
1208
1209                         if (!push_dir(dir)) {
1210                                 io_error |= IOERR_GENERAL;
1211                                 rsyserr(FERROR, errno, "push_dir %s failed",
1212                                         full_fname(dir));
1213                                 continue;
1214                         }
1215
1216                         if (lastdir && strcmp(lastdir, dir) == 0) {
1217                                 flist_dir = lastdir;
1218                                 flist_dir_len = lastdir_len;
1219                         } else {
1220                                 flist_dir = lastdir = strdup(dir);
1221                                 flist_dir_len = lastdir_len = strlen(dir);
1222                         }
1223                 }
1224
1225                 if (one_file_system)
1226                         filesystem_dev = st.st_dev;
1227
1228                 if ((file = send_file_name(f, flist, fname, XMIT_TOP_DIR))) {
1229                         if (recurse || (xfer_dirs && is_dot_dir))
1230                                 send_if_directory(f, flist, file);
1231                 }
1232
1233                 if (olddir[0]) {
1234                         flist_dir = NULL;
1235                         flist_dir_len = 0;
1236                         if (!pop_dir(olddir)) {
1237                                 rsyserr(FERROR, errno, "pop_dir %s failed",
1238                                         full_fname(dir));
1239                                 exit_cleanup(RERR_FILESELECT);
1240                         }
1241                 }
1242         }
1243
1244         gettimeofday(&end_tv, NULL);
1245         stats.flist_buildtime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1246                               + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1247         if (stats.flist_buildtime == 0)
1248                 stats.flist_buildtime = 1;
1249         start_tv = end_tv;
1250
1251         send_file_entry(NULL, f, 0);
1252
1253         if (show_filelist_p())
1254                 finish_filelist_progress(flist);
1255
1256         gettimeofday(&end_tv, NULL);
1257         stats.flist_xfertime = (int64)(end_tv.tv_sec - start_tv.tv_sec) * 1000
1258                              + (end_tv.tv_usec - start_tv.tv_usec) / 1000;
1259
1260         if (flist->hlink_pool) {
1261                 pool_destroy(flist->hlink_pool);
1262                 flist->hlink_pool = NULL;
1263         }
1264
1265         /* Sort the list without removing any duplicates.  This allows the
1266          * receiving side to ask for any name they like, which gives us the
1267          * flexibility to change the way we unduplicate names in the future
1268          * without causing a compatibility problem with older versions. */
1269         clean_flist(flist, 0, 0);
1270
1271         /* Now send the uid/gid list. This was introduced in
1272          * protocol version 15 */
1273         send_uid_list(f);
1274
1275         /* send the io_error flag */
1276         write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1277
1278         io_end_buffering();
1279         stats.flist_size = stats.total_written - start_write;
1280         stats.num_files = flist->count;
1281
1282         if (verbose > 3)
1283                 output_flist(flist);
1284
1285         if (verbose > 2)
1286                 rprintf(FINFO, "send_file_list done\n");
1287
1288         return flist;
1289 }
1290
1291
1292 struct file_list *recv_file_list(int f)
1293 {
1294         struct file_list *flist;
1295         unsigned short flags;
1296         int64 start_read;
1297
1298         if (show_filelist_p())
1299                 start_filelist_progress("receiving file list");
1300
1301         start_read = stats.total_read;
1302
1303         flist = flist_new(WITH_HLINK, "recv_file_list");
1304
1305         flist->count = 0;
1306         flist->malloced = 1000;
1307         flist->files = new_array(struct file_struct *, flist->malloced);
1308         if (!flist->files)
1309                 goto oom;
1310
1311
1312         while ((flags = read_byte(f)) != 0) {
1313                 struct file_struct *file;
1314
1315                 flist_expand(flist);
1316
1317                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1318                         flags |= read_byte(f) << 8;
1319                 file = receive_file_entry(flist, flags, f);
1320
1321                 if (S_ISREG(file->mode))
1322                         stats.total_size += file->length;
1323
1324                 flist->files[flist->count++] = file;
1325
1326                 maybe_emit_filelist_progress(flist->count);
1327
1328                 if (verbose > 2) {
1329                         rprintf(FINFO, "recv_file_name(%s)\n",
1330                                 safe_fname(f_name(file)));
1331                 }
1332         }
1333         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1334
1335         if (verbose > 2)
1336                 rprintf(FINFO, "received %d names\n", flist->count);
1337
1338         if (show_filelist_p())
1339                 finish_filelist_progress(flist);
1340
1341         clean_flist(flist, relative_paths, 1);
1342
1343         if (f >= 0) {
1344                 /* Now send the uid/gid list. This was introduced in
1345                  * protocol version 15 */
1346                 recv_uid_list(f, flist);
1347
1348                 /* Recv the io_error flag */
1349                 if (lp_ignore_errors(module_id) || ignore_errors)
1350                         read_int(f);
1351                 else
1352                         io_error |= read_int(f);
1353         }
1354
1355         if (verbose > 3)
1356                 output_flist(flist);
1357
1358         if (list_only) {
1359                 int i;
1360                 for (i = 0; i < flist->count; i++)
1361                         list_file_entry(flist->files[i]);
1362         }
1363
1364         if (verbose > 2)
1365                 rprintf(FINFO, "recv_file_list done\n");
1366
1367         stats.flist_size = stats.total_read - start_read;
1368         stats.num_files = flist->count;
1369
1370         return flist;
1371
1372 oom:
1373         out_of_memory("recv_file_list");
1374         return NULL;            /* not reached */
1375 }
1376
1377
1378 static int file_compare(struct file_struct **file1, struct file_struct **file2)
1379 {
1380         return f_name_cmp(*file1, *file2);
1381 }
1382
1383
1384 /* Search for an identically-named item in the file list.  Note that the
1385  * items must agree in their directory-ness, or no match is returned. */
1386 int flist_find(struct file_list *flist, struct file_struct *f)
1387 {
1388         int low = flist->low, high = flist->high;
1389         int ret, mid, mid_up;
1390
1391         while (low <= high) {
1392                 mid = (low + high) / 2;
1393                 for (mid_up = mid; !flist->files[mid_up]->basename; mid_up++) {}
1394                 if (mid_up <= high)
1395                         ret = f_name_cmp(flist->files[mid_up], f);
1396                 else
1397                         ret = 1;
1398                 if (ret == 0) {
1399                         if (protocol_version < 29
1400                             && S_ISDIR(flist->files[mid_up]->mode)
1401                             != S_ISDIR(f->mode))
1402                                 return -1;
1403                         return mid_up;
1404                 }
1405                 if (ret > 0)
1406                         high = mid - 1;
1407                 else
1408                         low = mid_up + 1;
1409         }
1410         return -1;
1411 }
1412
1413
1414 /*
1415  * Free up any resources a file_struct has allocated
1416  * and clear the file.
1417  */
1418 void clear_file(int i, struct file_list *flist)
1419 {
1420         if (flist->hlink_pool && flist->files[i]->link_u.idev)
1421                 pool_free(flist->hlink_pool, 0, flist->files[i]->link_u.idev);
1422         memset(flist->files[i], 0, file_struct_len);
1423 }
1424
1425
1426 /*
1427  * allocate a new file list
1428  */
1429 struct file_list *flist_new(int with_hlink, char *msg)
1430 {
1431         struct file_list *flist;
1432
1433         flist = new(struct file_list);
1434         if (!flist)
1435                 out_of_memory(msg);
1436
1437         memset(flist, 0, sizeof (struct file_list));
1438
1439         if (!(flist->file_pool = pool_create(FILE_EXTENT, 0,
1440             out_of_memory, POOL_INTERN)))
1441                 out_of_memory(msg);
1442
1443 #ifdef SUPPORT_HARD_LINKS
1444         if (with_hlink && preserve_hard_links) {
1445                 if (!(flist->hlink_pool = pool_create(HLINK_EXTENT,
1446                     sizeof (struct idev), out_of_memory, POOL_INTERN)))
1447                         out_of_memory(msg);
1448         }
1449 #endif
1450
1451         return flist;
1452 }
1453
1454 /*
1455  * free up all elements in a flist
1456  */
1457 void flist_free(struct file_list *flist)
1458 {
1459         pool_destroy(flist->file_pool);
1460         pool_destroy(flist->hlink_pool);
1461         free(flist->files);
1462         free(flist);
1463 }
1464
1465
1466 /*
1467  * This routine ensures we don't have any duplicate names in our file list.
1468  * duplicate names can cause corruption because of the pipelining
1469  */
1470 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1471 {
1472         int i, prev_i = 0;
1473
1474         if (!flist)
1475                 return;
1476         if (flist->count == 0) {
1477                 flist->high = -1;
1478                 return;
1479         }
1480
1481         sorting_flist = flist;
1482         qsort(flist->files, flist->count,
1483             sizeof flist->files[0], (int (*)())file_compare);
1484         sorting_flist = NULL;
1485
1486         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1487                 if (flist->files[i]->basename) {
1488                         prev_i = i;
1489                         break;
1490                 }
1491         }
1492         flist->low = prev_i;
1493         while (++i < flist->count) {
1494                 int j;
1495                 struct file_struct *file = flist->files[i];
1496
1497                 if (!file->basename)
1498                         continue;
1499                 if (f_name_cmp(file, flist->files[prev_i]) == 0)
1500                         j = prev_i;
1501                 else if (protocol_version >= 29 && S_ISDIR(file->mode)) {
1502                         int save_mode = file->mode;
1503                         /* Make sure that this directory doesn't duplicate a
1504                          * non-directory earlier in the list. */
1505                         flist->high = prev_i;
1506                         file->mode = S_IFREG;
1507                         j = flist_find(flist, file);
1508                         file->mode = save_mode;
1509                 } else
1510                         j = -1;
1511                 if (j >= 0) {
1512                         struct file_struct *fp = flist->files[j];
1513                         int keep, drop;
1514                         /* If one is a dir and the other is not, we want to
1515                          * keep the dir because it might have contents in the
1516                          * list. */
1517                         if (S_ISDIR(file->mode) != S_ISDIR(fp->mode)) {
1518                                 if (S_ISDIR(file->mode))
1519                                         keep = i, drop = j;
1520                                 else
1521                                         keep = j, drop = i;
1522                         } else
1523                                 keep = j, drop = i;
1524                         if (verbose > 1 && !am_server) {
1525                                 rprintf(FINFO,
1526                                         "removing duplicate name %s from file list (%d)\n",
1527                                         safe_fname(f_name(file)), drop);
1528                         }
1529                         /* Make sure that if we unduplicate '.', that we don't
1530                          * lose track of a user-specified top directory. */
1531                         flist->files[keep]->flags |= flist->files[drop]->flags
1532                                                    & (FLAG_TOP_DIR|FLAG_DEL_HERE);
1533
1534                         clear_file(drop, flist);
1535
1536                         if (keep == i) {
1537                                 if (flist->low == drop) {
1538                                         for (j = drop + 1;
1539                                              j < i && !flist->files[j]->basename;
1540                                              j++) {}
1541                                         flist->low = j;
1542                                 }
1543                                 prev_i = i;
1544                         }
1545                 } else
1546                         prev_i = i;
1547         }
1548         flist->high = no_dups ? prev_i : flist->count - 1;
1549
1550         if (strip_root) {
1551                 /* We need to strip off the leading slashes for relative
1552                  * paths, but this must be done _after_ the sorting phase. */
1553                 for (i = flist->low; i <= flist->high; i++) {
1554                         struct file_struct *file = flist->files[i];
1555
1556                         if (!file->dirname)
1557                                 continue;
1558                         if (*file->dirname == '/') {
1559                                 char *s = file->dirname + 1;
1560                                 while (*s == '/') s++;
1561                                 memmove(file->dirname, s, strlen(s) + 1);
1562                         }
1563
1564                         if (!*file->dirname)
1565                                 file->dirname = NULL;
1566                 }
1567         }
1568 }
1569
1570
1571 static void output_flist(struct file_list *flist)
1572 {
1573         char uidbuf[16], gidbuf[16], depthbuf[16];
1574         struct file_struct *file;
1575         const char *who = who_am_i();
1576         int i;
1577
1578         for (i = 0; i < flist->count; i++) {
1579                 file = flist->files[i];
1580                 if ((am_root || am_sender) && preserve_uid)
1581                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1582                 else
1583                         *uidbuf = '\0';
1584                 if (preserve_gid && file->gid != GID_NONE)
1585                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1586                 else
1587                         *gidbuf = '\0';
1588                 if (!am_sender)
1589                         sprintf(depthbuf, "%d", file->dir.depth);
1590                 rprintf(FINFO, "[%s] i=%d %s %s%s%s%s mode=0%o len=%.0f%s%s flags=%x\n",
1591                         who, i, am_sender ? NS(file->dir.root) : depthbuf,
1592                         file->dirname ? safe_fname(file->dirname) : "",
1593                         file->dirname ? "/" : "", NS(file->basename),
1594                         S_ISDIR(file->mode) ? "/" : "", (int)file->mode,
1595                         (double)file->length, uidbuf, gidbuf, file->flags);
1596         }
1597 }
1598
1599
1600 enum fnc_state { s_DIR, s_SLASH, s_BASE, s_TRAILING };
1601 enum fnc_type { t_PATH, t_ITEM };
1602
1603 /* Compare the names of two file_struct entities, similar to how strcmp()
1604  * would do if it were operating on the joined strings.
1605  *
1606  * Some differences beginning with protocol_version 29: (1) directory names
1607  * are compared with an assumed trailing slash so that they compare in a
1608  * way that would cause them to sort immediately prior to any content they
1609  * may have; (2) a directory of any name compares after a non-directory of
1610  * any name at the same depth; (3) a directory with name "." compares prior
1611  * to anything else.  These changes mean that a directory and a non-dir
1612  * with the same name will not compare as equal (protocol_version >= 29).
1613  *
1614  * The dirname component can be an empty string, but the basename component
1615  * cannot (and never is in the current codebase).  The basename component
1616  * may be NULL (for a removed item), in which case it is considered to be
1617  * after any existing item. */
1618 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1619 {
1620         int dif;
1621         const uchar *c1, *c2;
1622         enum fnc_state state1, state2;
1623         enum fnc_type type1, type2;
1624         enum fnc_type t_path = protocol_version >= 29 ? t_PATH : t_ITEM;
1625
1626         if (!f1 || !f1->basename) {
1627                 if (!f2 || !f2->basename)
1628                         return 0;
1629                 return -1;
1630         }
1631         if (!f2 || !f2->basename)
1632                 return 1;
1633
1634         c1 = (uchar*)f1->dirname;
1635         c2 = (uchar*)f2->dirname;
1636         if (c1 == c2)
1637                 c1 = c2 = NULL;
1638         if (!c1) {
1639                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1640                 c1 = (uchar*)f1->basename;
1641                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1642                         type1 = t_ITEM;
1643                         state1 = s_TRAILING;
1644                         c1 = (uchar*)"";
1645                 } else
1646                         state1 = s_BASE;
1647         } else if (!*c1) {
1648                 type1 = t_path;
1649                 state1 = s_SLASH;
1650                 c1 = (uchar*)"/";
1651         } else {
1652                 type1 = t_path;
1653                 state1 = s_DIR;
1654         }
1655         if (!c2) {
1656                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1657                 c2 = (uchar*)f2->basename;
1658                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1659                         type2 = t_ITEM;
1660                         state2 = s_TRAILING;
1661                         c2 = (uchar*)"";
1662                 } else
1663                         state2 = s_BASE;
1664         } else if (!*c2) {
1665                 type2 = t_path;
1666                 state2 = s_SLASH;
1667                 c2 = (uchar*)"/";
1668         } else {
1669                 type2 = t_path;
1670                 state2 = s_DIR;
1671         }
1672
1673         if (type1 != type2)
1674                 return type1 == t_PATH ? 1 : -1;
1675
1676         while (1) {
1677                 if ((dif = (int)*c1++ - (int)*c2++) != 0)
1678                         break;
1679                 if (!*c1) {
1680                         switch (state1) {
1681                         case s_DIR:
1682                                 state1 = s_SLASH;
1683                                 c1 = (uchar*)"/";
1684                                 break;
1685                         case s_SLASH:
1686                                 type1 = S_ISDIR(f1->mode) ? t_path : t_ITEM;
1687                                 c1 = (uchar*)f1->basename;
1688                                 if (type1 == t_PATH && *c1 == '.' && !c1[1]) {
1689                                         type1 = t_ITEM;
1690                                         state1 = s_TRAILING;
1691                                         c1 = (uchar*)"";
1692                                 } else
1693                                         state1 = s_BASE;
1694                                 break;
1695                         case s_BASE:
1696                                 state1 = s_TRAILING;
1697                                 if (type1 == t_PATH) {
1698                                         c1 = (uchar*)"/";
1699                                         break;
1700                                 }
1701                                 /* FALL THROUGH */
1702                         case s_TRAILING:
1703                                 type1 = t_ITEM;
1704                                 break;
1705                         }
1706                         if (*c2 && type1 != type2)
1707                                 return type1 == t_PATH ? 1 : -1;
1708                 }
1709                 if (!*c2) {
1710                         switch (state2) {
1711                         case s_DIR:
1712                                 state2 = s_SLASH;
1713                                 c2 = (uchar*)"/";
1714                                 break;
1715                         case s_SLASH:
1716                                 type2 = S_ISDIR(f2->mode) ? t_path : t_ITEM;
1717                                 c2 = (uchar*)f2->basename;
1718                                 if (type2 == t_PATH && *c2 == '.' && !c2[1]) {
1719                                         type2 = t_ITEM;
1720                                         state2 = s_TRAILING;
1721                                         c2 = (uchar*)"";
1722                                 } else
1723                                         state2 = s_BASE;
1724                                 break;
1725                         case s_BASE:
1726                                 state2 = s_TRAILING;
1727                                 if (type2 == t_PATH) {
1728                                         c2 = (uchar*)"/";
1729                                         break;
1730                                 }
1731                                 /* FALL THROUGH */
1732                         case s_TRAILING:
1733                                 if (!*c1)
1734                                         return 0;
1735                                 type2 = t_ITEM;
1736                                 break;
1737                         }
1738                         if (type1 != type2)
1739                                 return type1 == t_PATH ? 1 : -1;
1740                 }
1741         }
1742
1743         return dif;
1744 }
1745
1746
1747 /* Return a copy of the full filename of a flist entry, using the indicated
1748  * buffer.  No size-checking is done because we checked the size when creating
1749  * the file_struct entry.
1750  */
1751 char *f_name_to(struct file_struct *f, char *fbuf)
1752 {
1753         if (!f || !f->basename)
1754                 return NULL;
1755
1756         if (f->dirname) {
1757                 int len = strlen(f->dirname);
1758                 memcpy(fbuf, f->dirname, len);
1759                 fbuf[len] = '/';
1760                 strcpy(fbuf + len + 1, f->basename);
1761         } else
1762                 strcpy(fbuf, f->basename);
1763         return fbuf;
1764 }
1765
1766
1767 /* Like f_name_to(), but we rotate through 5 static buffers of our own. */
1768 char *f_name(struct file_struct *f)
1769 {
1770         static char names[5][MAXPATHLEN];
1771         static unsigned int n;
1772
1773         n = (n + 1) % (sizeof names / sizeof names[0]);
1774
1775         return f_name_to(f, names[n]);
1776 }
1777
1778
1779 /* Do a non-recursive scan of the named directory, possibly ignoring all
1780  * exclude rules except for the daemon's.  If "dlen" is >=0, it is the length
1781  * of the dirname string, and also indicates that "dirname" is a MAXPATHLEN
1782  * buffer (the functions we call will append names onto the end, but the old
1783  * dir value will be restored on exit). */
1784 struct file_list *get_dirlist(char *dirname, int dlen,
1785                               int ignore_filter_rules)
1786 {
1787         struct file_list *dirlist;
1788         char dirbuf[MAXPATHLEN];
1789         int save_recurse = recurse;
1790
1791         if (dlen < 0) {
1792                 dlen = strlcpy(dirbuf, dirname, MAXPATHLEN);
1793                 if (dlen >= MAXPATHLEN)
1794                         return NULL;
1795                 dirname = dirbuf;
1796         }
1797
1798         dirlist = flist_new(WITHOUT_HLINK, "get_dirlist");
1799
1800         recurse = 0;
1801         send_directory(ignore_filter_rules ? -2 : -1, dirlist, dirname, dlen);
1802         recurse = save_recurse;
1803         if (do_progress)
1804                 flist_count_offset += dirlist->count;
1805
1806         clean_flist(dirlist, 0, 0);
1807
1808         if (verbose > 3)
1809                 output_flist(dirlist);
1810
1811         return dirlist;
1812 }