flist.c

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