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 struct stats stats;
  31
  32 extern int verbose;
  33 extern int do_progress;
  34 extern int am_root;
  35 extern int am_server;
  36 extern int always_checksum;
  37 extern int module_id;
  38 extern int ignore_errors;
  39 extern int numeric_ids;
  40
  41 extern int cvs_exclude;
  42
  43 extern int recurse;
  44 extern char curr_dir[MAXPATHLEN];
  45 extern char *files_from;
  46 extern int filesfrom_fd;
  47
  48 extern int one_file_system;
  49 extern int make_backups;
  50 extern int preserve_links;
  51 extern int preserve_hard_links;
  52 extern int preserve_perms;
  53 extern int preserve_devices;
  54 extern int preserve_uid;
  55 extern int preserve_gid;
  56 extern int preserve_times;
  57 extern int relative_paths;
  58 extern int implied_dirs;
  59 extern int copy_links;
  60 extern int copy_unsafe_links;
  61 extern int protocol_version;
  62 extern int sanitize_paths;
  63
  64 extern int read_batch;
  65 extern int write_batch;
  66
  67 extern struct exclude_struct **exclude_list;
  68 extern struct exclude_struct **server_exclude_list;
  69 extern struct exclude_struct **local_exclude_list;
  70
  71 int io_error;
  72
  73 static char empty_sum[MD4_SUM_LENGTH];
  74 static unsigned int min_file_struct_len;
  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
  80 void init_flist(void)
  81 {
  82         struct file_struct f;
  83
  84         /* Figure out how big the file_struct is without trailing padding */
  85         min_file_struct_len = ((char*)&f.flags - (char*)&f) + sizeof f.flags;
  86 }
  87
  88
  89 static int show_filelist_p(void)
  90 {
  91         return verbose && (recurse || files_from) && !am_server;
  92 }
  93
  94 static void start_filelist_progress(char *kind)
  95 {
  96         rprintf(FINFO, "%s ... ", kind);
  97         if ((verbose > 1) || do_progress)
  98                 rprintf(FINFO, "\n");
  99         rflush(FINFO);
 100 }
 101
 102
 103 static void emit_filelist_progress(const struct file_list *flist)
 104 {
 105         rprintf(FINFO, " %d files...\r", flist->count);
 106 }
 107
 108
 109 static void maybe_emit_filelist_progress(const struct file_list *flist)
 110 {
 111         if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
 112                 emit_filelist_progress(flist);
 113 }
 114
 115
 116 static void finish_filelist_progress(const struct file_list *flist)
 117 {
 118         if (do_progress) {
 119                 /* This overwrites the progress line */
 120                 rprintf(FINFO, "%d file%sto consider\n",
 121                         flist->count, flist->count == 1 ? " " : "s ");
 122         } else
 123                 rprintf(FINFO, "done\n");
 124 }
 125
 126 void show_flist_stats(void)
 127 {
 128         /* Nothing yet */
 129 }
 130
 131
 132 static void list_file_entry(struct file_struct *f)
 133 {
 134         char perms[11];
 135
 136         if (!f->basename)
 137                 /* this can happen if duplicate names were removed */
 138                 return;
 139
 140         permstring(perms, f->mode);
 141
 142 #if 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                         f_name(f), f->u.link);
 148         } else
 149 #endif
 150                 rprintf(FINFO, "%s %11.0f %s %s\n",
 151                         perms,
 152                         (double) f->length, timestring(f->modtime),
 153                         f_name(f));
 154 }
 155
 156
 157 /**
 158  * Stat either a symlink or its referent, depending on the settings of
 159  * copy_links, copy_unsafe_links, etc.
 160  *
 161  * @retval -1 on error
 162  *
 163  * @retval 0 for success
 164  *
 165  * @post If @p path is a symlink, then @p linkbuf (of size @c
 166  * MAXPATHLEN) contains the symlink target.
 167  *
 168  * @post @p buffer contains information about the link or the
 169  * referrent as appropriate, if they exist.
 170  **/
 171 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 172 {
 173 #if SUPPORT_LINKS
 174         if (copy_links)
 175                 return do_stat(path, buffer);
 176         if (do_lstat(path, buffer) == -1)
 177                 return -1;
 178         if (S_ISLNK(buffer->st_mode)) {
 179                 int l = readlink((char *) path, linkbuf, MAXPATHLEN - 1);
 180                 if (l == -1)
 181                         return -1;
 182                 linkbuf[l] = 0;
 183                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 184                         if (verbose > 1) {
 185                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 186                                         path, linkbuf);
 187                         }
 188                         return do_stat(path, buffer);
 189                 }
 190         }
 191         return 0;
 192 #else
 193         return do_stat(path, buffer);
 194 #endif
 195 }
 196
 197 int link_stat(const char *path, STRUCT_STAT * buffer)
 198 {
 199 #if SUPPORT_LINKS
 200         if (copy_links)
 201                 return do_stat(path, buffer);
 202         return do_lstat(path, buffer);
 203 #else
 204         return do_stat(path, buffer);
 205 #endif
 206 }
 207
 208 /*
 209  * This function is used to check if a file should be included/excluded
 210  * from the list of files based on its name and type etc.  The value of
 211  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 212  */
 213 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 214 {
 215 #if 0 /* This currently never happens, so avoid a useless compare. */
 216         if (exclude_level == NO_EXCLUDES)
 217                 return 0;
 218 #endif
 219         if (fname) {
 220                 /* never exclude '.', even if somebody does --exclude '*' */
 221                 if (fname[0] == '.' && !fname[1])
 222                         return 0;
 223                 /* Handle the -R version of the '.' dir. */
 224                 if (fname[0] == '/') {
 225                         int len = strlen(fname);
 226                         if (fname[len-1] == '.' && fname[len-2] == '/')
 227                                 return 0;
 228                 }
 229         }
 230         if (server_exclude_list
 231          && check_exclude(server_exclude_list, fname, is_dir))
 232                 return 1;
 233         if (exclude_level != ALL_EXCLUDES)
 234                 return 0;
 235         if (exclude_list && check_exclude(exclude_list, fname, is_dir))
 236                 return 1;
 237         if (local_exclude_list
 238          && check_exclude(local_exclude_list, fname, is_dir))
 239                 return 1;
 240         return 0;
 241 }
 242
 243 /* used by the one_file_system code */
 244 static dev_t filesystem_dev;
 245
 246 static void set_filesystem(char *fname)
 247 {
 248         STRUCT_STAT st;
 249         if (link_stat(fname, &st) != 0)
 250                 return;
 251         filesystem_dev = st.st_dev;
 252 }
 253
 254
 255 static int to_wire_mode(mode_t mode)
 256 {
 257 #if SUPPORT_LINKS
 258         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 259                 return (mode & ~(_S_IFMT)) | 0120000;
 260 #endif
 261         return (int) mode;
 262 }
 263
 264 static mode_t from_wire_mode(int mode)
 265 {
 266         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 267                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 268         return (mode_t) mode;
 269 }
 270
 271
 272 static void send_directory(int f, struct file_list *flist, char *dir);
 273
 274 static char *flist_dir;
 275 static int flist_dir_len;
 276
 277
 278 /**
 279  * Make sure @p flist is big enough to hold at least @p flist->count
 280  * entries.
 281  **/
 282 void flist_expand(struct file_list *flist)
 283 {
 284         void *new_ptr;
 285
 286         if (flist->count < flist->malloced)
 287                 return;
 288
 289         if (flist->malloced < FLIST_START)
 290                 flist->malloced = FLIST_START;
 291         else if (flist->malloced >= FLIST_LINEAR)
 292                 flist->malloced += FLIST_LINEAR;
 293         else
 294                 flist->malloced *= 2;
 295
 296         /*
 297          * In case count jumped or we are starting the list
 298          * with a known size just set it.
 299          */
 300         if (flist->malloced < flist->count)
 301                 flist->malloced = flist->count;
 302
 303         if (flist->files) {
 304                 new_ptr = realloc_array(flist->files,
 305                     struct file_struct *, flist->malloced);
 306         } else {
 307                 new_ptr = new_array(struct file_struct *, flist->malloced);
 308         }
 309
 310         if (verbose >= 2) {
 311                 rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 312                     who_am_i(),
 313                     (double) sizeof flist->files[0] * flist->malloced,
 314                     (new_ptr == flist->files) ? " not" : "");
 315         }
 316
 317         flist->files = (struct file_struct **) new_ptr;
 318
 319         if (!flist->files)
 320                 out_of_memory("flist_expand");
 321 }
 322
 323 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 324 {
 325         unsigned short flags;
 326         static time_t modtime;
 327         static mode_t mode;
 328         static DEV64_T rdev, rdev_high;
 329         static DEV64_T dev;
 330         static uid_t uid;
 331         static gid_t gid;
 332         static char lastname[MAXPATHLEN];
 333         char *fname, fbuf[MAXPATHLEN];
 334         int l1, l2;
 335
 336         if (f == -1)
 337                 return;
 338
 339         if (!file) {
 340                 write_byte(f, 0);
 341                 modtime = 0, mode = 0;
 342                 rdev = 0, rdev_high = 0, dev = 0;
 343                 uid = 0, gid = 0;
 344                 *lastname = '\0';
 345                 return;
 346         }
 347
 348         io_write_phase = "send_file_entry";
 349
 350         fname = f_name_to(file, fbuf);
 351
 352         flags = base_flags;
 353
 354         if (file->mode == mode)
 355                 flags |= XMIT_SAME_MODE;
 356         else
 357                 mode = file->mode;
 358         if (preserve_devices) {
 359                 if (protocol_version < 28) {
 360                         if (IS_DEVICE(mode)) {
 361                                 if (file->u.rdev == rdev) {
 362                                         /* Set both flags to simplify the test
 363                                          * when writing the data. */
 364                                         flags |= XMIT_SAME_RDEV_pre28
 365                                                | XMIT_SAME_HIGH_RDEV;
 366                                 } else
 367                                         rdev = file->u.rdev;
 368                         } else
 369                                 rdev = 0;
 370                 } else if (IS_DEVICE(mode)) {
 371                         if ((file->u.rdev & ~0xFF) == rdev_high)
 372                                 flags |= XMIT_SAME_HIGH_RDEV;
 373                         else {
 374                                 rdev = file->u.rdev;
 375                                 rdev_high = rdev & ~0xFF;
 376                         }
 377                 }
 378         }
 379         if (file->uid == uid)
 380                 flags |= XMIT_SAME_UID;
 381         else
 382                 uid = file->uid;
 383         if (file->gid == gid)
 384                 flags |= XMIT_SAME_GID;
 385         else
 386                 gid = file->gid;
 387         if (file->modtime == modtime)
 388                 flags |= XMIT_SAME_TIME;
 389         else
 390                 modtime = file->modtime;
 391
 392 #if SUPPORT_HARD_LINKS
 393         if (file->link_u.idev) {
 394                 if (file->F_DEV == dev) {
 395                         if (protocol_version >= 28)
 396                                 flags |= XMIT_SAME_DEV;
 397                 } else
 398                         dev = file->F_DEV;
 399                 flags |= XMIT_HAS_IDEV_DATA;
 400         }
 401 #endif
 402
 403         for (l1 = 0;
 404              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 405              l1++) {}
 406         l2 = strlen(fname+l1);
 407
 408         if (l1 > 0)
 409                 flags |= XMIT_SAME_NAME;
 410         if (l2 > 255)
 411                 flags |= XMIT_LONG_NAME;
 412
 413         /* We must make sure we don't send a zero flag byte or the
 414          * other end will terminate the flist transfer.  Note that
 415          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 416          * it's harmless way to add a bit to the first flag byte. */
 417         if (protocol_version >= 28) {
 418                 if (!flags && !S_ISDIR(mode))
 419                         flags |= XMIT_TOP_DIR;
 420                 if ((flags & 0xFF00) || !flags) {
 421                         flags |= XMIT_EXTENDED_FLAGS;
 422                         write_byte(f, flags);
 423                         write_byte(f, flags >> 8);
 424                 } else
 425                         write_byte(f, flags);
 426         } else {
 427                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 428                         flags |= XMIT_TOP_DIR;
 429                 if (!(flags & 0xFF))
 430                         flags |= XMIT_LONG_NAME;
 431                 write_byte(f, flags);
 432         }
 433         if (flags & XMIT_SAME_NAME)
 434                 write_byte(f, l1);
 435         if (flags & XMIT_LONG_NAME)
 436                 write_int(f, l2);
 437         else
 438                 write_byte(f, l2);
 439         write_buf(f, fname + l1, l2);
 440
 441         write_longint(f, file->length);
 442         if (!(flags & XMIT_SAME_TIME))
 443                 write_int(f, modtime);
 444         if (!(flags & XMIT_SAME_MODE))
 445                 write_int(f, to_wire_mode(mode));
 446         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 447                 if (!numeric_ids)
 448                         add_uid(uid);
 449                 write_int(f, uid);
 450         }
 451         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 452                 if (!numeric_ids)
 453                         add_gid(gid);
 454                 write_int(f, gid);
 455         }
 456         if (preserve_devices && IS_DEVICE(mode)) {
 457                 /* If XMIT_SAME_HIGH_RDEV is off, XMIT_SAME_RDEV_pre28 is
 458                  * also off. */
 459                 if (!(flags & XMIT_SAME_HIGH_RDEV))
 460                         write_int(f, rdev);
 461                 else if (protocol_version >= 28)
 462                         write_byte(f, rdev);
 463         }
 464
 465 #if SUPPORT_LINKS
 466         if (preserve_links && S_ISLNK(mode)) {
 467                 int len = strlen(file->u.link);
 468                 write_int(f, len);
 469                 write_buf(f, file->u.link, len);
 470         }
 471 #endif
 472
 473 #if SUPPORT_HARD_LINKS
 474         if (flags & XMIT_HAS_IDEV_DATA) {
 475                 if (protocol_version < 26) {
 476                         /* 32-bit dev_t and ino_t */
 477                         write_int(f, dev);
 478                         write_int(f, file->F_INODE);
 479                 } else {
 480                         /* 64-bit dev_t and ino_t */
 481                         if (!(flags & XMIT_SAME_DEV))
 482                                 write_longint(f, dev);
 483                         write_longint(f, file->F_INODE);
 484                 }
 485         }
 486 #endif
 487
 488         if (always_checksum) {
 489                 char *sum;
 490                 if (S_ISREG(mode))
 491                         sum = file->u.sum;
 492                 else if (protocol_version < 28) {
 493                         /* Prior to 28, we sent a useless set of nulls. */
 494                         sum = empty_sum;
 495                 } else
 496                         sum = NULL;
 497                 if (sum) {
 498                         write_buf(f, sum, protocol_version < 21? 2
 499                                                         : MD4_SUM_LENGTH);
 500                 }
 501         }
 502
 503         strlcpy(lastname, fname, MAXPATHLEN);
 504
 505         io_write_phase = "unknown";
 506 }
 507
 508
 509
 510 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 511 {
 512         static time_t modtime;
 513         static mode_t mode;
 514         static DEV64_T rdev, rdev_high;
 515         static DEV64_T dev;
 516         static uid_t uid;
 517         static gid_t gid;
 518         static char lastname[MAXPATHLEN], *lastdir;
 519         static int lastdir_len = -1;
 520         char thisname[MAXPATHLEN];
 521         unsigned int l1 = 0, l2 = 0;
 522         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 523         int file_struct_len, idev_len;
 524         OFF_T file_length;
 525         char *basename, *dirname, *bp;
 526         struct file_struct *file;
 527
 528         if (!fptr) {
 529                 modtime = 0, mode = 0;
 530                 rdev = 0, rdev_high = 0, dev = 0;
 531                 uid = 0, gid = 0;
 532                 *lastname = '\0';
 533                 return;
 534         }
 535
 536         if (flags & XMIT_SAME_NAME)
 537                 l1 = read_byte(f);
 538
 539         if (flags & XMIT_LONG_NAME)
 540                 l2 = read_int(f);
 541         else
 542                 l2 = read_byte(f);
 543
 544         if (l2 >= MAXPATHLEN - l1) {
 545                 rprintf(FERROR,
 546                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 547                         flags, l1, l2, lastname);
 548                 overflow("receive_file_entry");
 549         }
 550
 551         strlcpy(thisname, lastname, l1 + 1);
 552         read_sbuf(f, &thisname[l1], l2);
 553         thisname[l1 + l2] = 0;
 554
 555         strlcpy(lastname, thisname, MAXPATHLEN);
 556
 557         clean_fname(thisname);
 558
 559         if (sanitize_paths)
 560                 sanitize_path(thisname, NULL);
 561
 562         if ((basename = strrchr(thisname, '/')) != NULL) {
 563                 dirname_len = ++basename - thisname; /* counts future '\0' */
 564                 if (lastdir_len == dirname_len - 1
 565                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 566                         dirname = lastdir;
 567                         dirname_len = 0; /* indicates no copy is needed */
 568                 } else
 569                         dirname = thisname;
 570         } else {
 571                 basename = thisname;
 572                 dirname = NULL;
 573                 dirname_len = 0;
 574         }
 575         basename_len = strlen(basename) + 1; /* count the '\0' */
 576
 577         file_length = read_longint(f);
 578         if (!(flags & XMIT_SAME_TIME))
 579                 modtime = (time_t)read_int(f);
 580         if (!(flags & XMIT_SAME_MODE))
 581                 mode = from_wire_mode(read_int(f));
 582
 583         if (preserve_uid && !(flags & XMIT_SAME_UID))
 584                 uid = (uid_t)read_int(f);
 585         if (preserve_gid && !(flags & XMIT_SAME_GID))
 586                 gid = (gid_t)read_int(f);
 587
 588         if (preserve_devices) {
 589                 if (protocol_version < 28) {
 590                         if (IS_DEVICE(mode)) {
 591                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 592                                         rdev = (DEV64_T)read_int(f);
 593                         } else
 594                                 rdev = 0;
 595                 } else if (IS_DEVICE(mode)) {
 596                         if (!(flags & XMIT_SAME_HIGH_RDEV)) {
 597                                 rdev = (DEV64_T)read_int(f);
 598                                 rdev_high = rdev & ~0xFF;
 599                         } else
 600                                 rdev = rdev_high | (DEV64_T)read_byte(f);
 601                 }
 602         }
 603
 604 #if SUPPORT_LINKS
 605         if (preserve_links && S_ISLNK(mode)) {
 606                 linkname_len = read_int(f) + 1; /* count the '\0' */
 607                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 608                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 609                                 linkname_len - 1);
 610                         overflow("receive_file_entry");
 611                 }
 612         }
 613         else
 614 #endif
 615                 linkname_len = 0;
 616
 617 #if SUPPORT_HARD_LINKS
 618         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 619                 flags |= XMIT_HAS_IDEV_DATA;
 620         if (flags & XMIT_HAS_IDEV_DATA)
 621                 idev_len = sizeof (struct idev);
 622         else
 623 #endif
 624                 idev_len = 0;
 625
 626         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 627         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
 628
 629         alloc_len = file_struct_len + dirname_len + basename_len
 630                   + linkname_len + sum_len + idev_len;
 631         if (!(bp = new_array(char, alloc_len)))
 632                 out_of_memory("receive_file_entry");
 633         file = *fptr = (struct file_struct *)bp;
 634         memset(bp, 0, min_file_struct_len);
 635         bp += file_struct_len;
 636
 637         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
 638         file->modtime = modtime;
 639         file->length = file_length;
 640         file->mode = mode;
 641         file->uid = uid;
 642         file->gid = gid;
 643
 644 #if SUPPORT_HARD_LINKS
 645         if (idev_len) {
 646                 file->link_u.idev = (struct idev *)bp;
 647                 bp += idev_len;
 648         }
 649 #endif
 650
 651         if (dirname_len) {
 652                 file->dirname = lastdir = bp;
 653                 lastdir_len = dirname_len - 1;
 654                 memcpy(bp, dirname, dirname_len - 1);
 655                 bp += dirname_len;
 656                 bp[-1] = '\0';
 657         } else if (dirname)
 658                 file->dirname = dirname;
 659
 660         file->basename = bp;
 661         memcpy(bp, basename, basename_len);
 662         bp += basename_len;
 663
 664         if (preserve_devices && IS_DEVICE(mode))
 665                 file->u.rdev = rdev;
 666
 667 #if SUPPORT_LINKS
 668         if (linkname_len) {
 669                 file->u.link = bp;
 670                 read_sbuf(f, bp, linkname_len - 1);
 671                 if (sanitize_paths)
 672                         sanitize_path(bp, lastdir);
 673                 bp += linkname_len;
 674         }
 675 #endif
 676
 677 #if SUPPORT_HARD_LINKS
 678         if (idev_len) {
 679                 if (protocol_version < 26) {
 680                         dev = read_int(f);
 681                         file->F_INODE = read_int(f);
 682                 } else {
 683                         if (!(flags & XMIT_SAME_DEV))
 684                                 dev = read_longint(f);
 685                         file->F_INODE = read_longint(f);
 686                 }
 687                 file->F_DEV = dev;
 688         }
 689 #endif
 690
 691         if (always_checksum) {
 692                 char *sum;
 693                 if (sum_len) {
 694                         file->u.sum = sum = bp;
 695                         /*bp += sum_len;*/
 696                 } else if (protocol_version < 28) {
 697                         /* Prior to 28, we get a useless set of nulls. */
 698                         sum = empty_sum;
 699                 } else
 700                         sum = NULL;
 701                 if (sum) {
 702                         read_buf(f, sum, protocol_version < 21? 2
 703                                                 : MD4_SUM_LENGTH);
 704                 }
 705         }
 706
 707         if (!preserve_perms) {
 708                 extern int orig_umask;
 709                 /* set an appropriate set of permissions based on original
 710                  * permissions and umask. This emulates what GNU cp does */
 711                 file->mode &= ~orig_umask;
 712         }
 713 }
 714
 715
 716 /**
 717  * Create a file_struct for a named file by reading its stat()
 718  * information and performing extensive checks against global
 719  * options.
 720  *
 721  * @return the new file, or NULL if there was an error or this file
 722  * should be excluded.
 723  *
 724  * @todo There is a small optimization opportunity here to avoid
 725  * stat()ing the file in some circumstances, which has a certain cost.
 726  * We are called immediately after doing readdir(), and so we may
 727  * already know the d_type of the file.  We could for example avoid
 728  * statting directories if we're not recursing, but this is not a very
 729  * important case.  Some systems may not have d_type.
 730  **/
 731 struct file_struct *make_file(char *fname, int exclude_level)
 732 {
 733         static char *lastdir;
 734         static int lastdir_len = -1;
 735         struct file_struct *file;
 736         STRUCT_STAT st;
 737         char sum[SUM_LENGTH];
 738         char thisname[MAXPATHLEN];
 739         char linkname[MAXPATHLEN];
 740         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 741         int file_struct_len, idev_len;
 742         char *basename, *dirname, *bp;
 743         unsigned short flags = 0;
 744
 745         if (strlcpy(thisname, fname, sizeof thisname)
 746             >= sizeof thisname - flist_dir_len) {
 747                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 748                 return NULL;
 749         }
 750         clean_fname(thisname);
 751         if (sanitize_paths)
 752                 sanitize_path(thisname, NULL);
 753
 754         memset(sum, 0, SUM_LENGTH);
 755
 756         if (readlink_stat(thisname, &st, linkname) != 0) {
 757                 int save_errno = errno;
 758                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 759                         /* either symlink pointing nowhere or file that
 760                          * was removed during rsync run; see if excluded
 761                          * before reporting an error */
 762                         if (check_exclude_file(thisname, 0, exclude_level)) {
 763                                 /* file is excluded anyway, ignore silently */
 764                                 return NULL;
 765                         }
 766                 }
 767                 io_error |= IOERR_GENERAL;
 768                 rprintf(FERROR, "readlink %s failed: %s\n",
 769                         full_fname(thisname), strerror(save_errno));
 770                 return NULL;
 771         }
 772
 773         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 774         if (exclude_level == NO_EXCLUDES)
 775                 goto skip_excludes;
 776
 777         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 778                 rprintf(FINFO, "skipping directory %s\n", thisname);
 779                 return NULL;
 780         }
 781
 782         /* We only care about directories because we need to avoid recursing
 783          * into a mount-point directory, not to avoid copying a symlinked
 784          * file if -L (or similar) was specified. */
 785         if (one_file_system && st.st_dev != filesystem_dev
 786             && S_ISDIR(st.st_mode))
 787                 flags |= FLAG_MOUNT_POINT;
 788
 789         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
 790                 return NULL;
 791
 792         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
 793                 return NULL;
 794
 795       skip_excludes:
 796
 797         if (verbose > 2) {
 798                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 799                         who_am_i(), thisname, exclude_level);
 800         }
 801
 802         if ((basename = strrchr(thisname, '/')) != NULL) {
 803                 dirname_len = ++basename - thisname; /* counts future '\0' */
 804                 if (lastdir_len == dirname_len - 1
 805                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 806                         dirname = lastdir;
 807                         dirname_len = 0; /* indicates no copy is needed */
 808                 } else
 809                         dirname = thisname;
 810         } else {
 811                 basename = thisname;
 812                 dirname = NULL;
 813                 dirname_len = 0;
 814         }
 815         basename_len = strlen(basename) + 1; /* count the '\0' */
 816
 817 #if SUPPORT_LINKS
 818         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 819 #else
 820         linkname_len = 0;
 821 #endif
 822
 823 #if SUPPORT_HARD_LINKS
 824         if (preserve_hard_links) {
 825                 if (protocol_version < 28) {
 826                         if (S_ISREG(st.st_mode))
 827                                 idev_len = sizeof (struct idev);
 828                         else
 829                                 idev_len = 0;
 830                 } else {
 831                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 832                                 idev_len = sizeof (struct idev);
 833                         else
 834                                 idev_len = 0;
 835                 }
 836         } else
 837 #endif
 838                 idev_len = 0;
 839
 840         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 841         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
 842
 843         alloc_len = file_struct_len + dirname_len + basename_len
 844                   + linkname_len + sum_len + idev_len;
 845         if (!(bp = new_array(char, alloc_len)))
 846                 out_of_memory("receive_file_entry");
 847         file = (struct file_struct *)bp;
 848         memset(bp, 0, min_file_struct_len);
 849         bp += file_struct_len;
 850
 851         file->flags = flags;
 852         file->modtime = st.st_mtime;
 853         file->length = st.st_size;
 854         file->mode = st.st_mode;
 855         file->uid = st.st_uid;
 856         file->gid = st.st_gid;
 857
 858 #if SUPPORT_HARD_LINKS
 859         if (idev_len) {
 860                 file->link_u.idev = (struct idev *)bp;
 861                 bp += idev_len;
 862                 file->F_DEV = st.st_dev;
 863                 file->F_INODE = st.st_ino;
 864         }
 865 #endif
 866
 867         if (dirname_len) {
 868                 file->dirname = lastdir = bp;
 869                 lastdir_len = dirname_len - 1;
 870                 memcpy(bp, dirname, dirname_len - 1);
 871                 bp += dirname_len;
 872                 bp[-1] = '\0';
 873         } else if (dirname)
 874                 file->dirname = dirname;
 875
 876         file->basename = bp;
 877         memcpy(bp, basename, basename_len);
 878         bp += basename_len;
 879
 880 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 881         if (preserve_devices && IS_DEVICE(st.st_mode))
 882                 file->u.rdev = st.st_rdev;
 883 #endif
 884
 885 #if SUPPORT_LINKS
 886         if (linkname_len) {
 887                 file->u.link = bp;
 888                 memcpy(bp, linkname, linkname_len);
 889                 bp += linkname_len;
 890         }
 891 #endif
 892
 893         if (sum_len) {
 894                 file->u.sum = bp;
 895                 file_checksum(thisname, bp, st.st_size);
 896                 /*bp += sum_len;*/
 897         }
 898
 899         file->basedir = flist_dir;
 900
 901         if (!S_ISDIR(st.st_mode))
 902                 stats.total_size += st.st_size;
 903
 904         return file;
 905 }
 906
 907
 908 void send_file_name(int f, struct file_list *flist, char *fname,
 909                     int recursive, unsigned short base_flags)
 910 {
 911         struct file_struct *file;
 912         char fbuf[MAXPATHLEN];
 913         extern int delete_excluded;
 914
 915         /* f is set to -1 when calculating deletion file list */
 916         file = make_file(fname,
 917                          f == -1 && delete_excluded? SERVER_EXCLUDES
 918                                                    : ALL_EXCLUDES);
 919
 920         if (!file)
 921                 return;
 922
 923         maybe_emit_filelist_progress(flist);
 924
 925         flist_expand(flist);
 926
 927         if (write_batch)
 928                 file->flags |= FLAG_TOP_DIR;
 929
 930         if (file->basename[0]) {
 931                 flist->files[flist->count++] = file;
 932                 send_file_entry(file, f, base_flags);
 933         }
 934
 935         if (recursive && S_ISDIR(file->mode)
 936             && !(file->flags & FLAG_MOUNT_POINT)) {
 937                 struct exclude_struct **last_exclude_list = local_exclude_list;
 938                 send_directory(f, flist, f_name_to(file, fbuf));
 939                 local_exclude_list = last_exclude_list;
 940                 return;
 941         }
 942 }
 943
 944
 945 static void send_directory(int f, struct file_list *flist, char *dir)
 946 {
 947         DIR *d;
 948         struct dirent *di;
 949         char fname[MAXPATHLEN];
 950         unsigned int offset;
 951         char *p;
 952
 953         d = opendir(dir);
 954         if (!d) {
 955                 io_error |= IOERR_GENERAL;
 956                 rprintf(FERROR, "opendir %s failed: %s\n",
 957                         full_fname(dir), strerror(errno));
 958                 return;
 959         }
 960
 961         offset = strlcpy(fname, dir, MAXPATHLEN);
 962         p = fname + offset;
 963         if (offset >= MAXPATHLEN || p[-1] != '/') {
 964                 if (offset >= MAXPATHLEN - 1) {
 965                         io_error |= IOERR_GENERAL;
 966                         rprintf(FERROR, "skipping long-named directory: %s\n",
 967                                 full_fname(fname));
 968                         closedir(d);
 969                         return;
 970                 }
 971                 *p++ = '/';
 972                 offset++;
 973         }
 974
 975         local_exclude_list = NULL;
 976
 977         if (cvs_exclude) {
 978                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
 979                     < MAXPATHLEN - offset)
 980                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 981                 else {
 982                         io_error |= IOERR_GENERAL;
 983                         rprintf(FINFO,
 984                                 "cannot cvs-exclude in long-named directory %s\n",
 985                                 full_fname(fname));
 986                 }
 987         }
 988
 989         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 990                 char *dname = d_name(di);
 991                 if (dname[0] == '.' && (dname[1] == '\0'
 992                     || (dname[1] == '.' && dname[2] == '\0')))
 993                         continue;
 994                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
 995                         send_file_name(f, flist, fname, recurse, 0);
 996                 else {
 997                         io_error |= IOERR_GENERAL;
 998                         rprintf(FINFO,
 999                                 "cannot send long-named file %s\n",
1000                                 full_fname(fname));
1001                 }
1002         }
1003         if (errno) {
1004                 io_error |= IOERR_GENERAL;
1005                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
1006                         dir, errno, strerror(errno));
1007         }
1008
1009         if (local_exclude_list)
1010                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
1011
1012         closedir(d);
1013 }
1014
1015
1016 /**
1017  * The delete_files() function in receiver.c sets f to -1 so that we just
1018  * construct the file list in memory without sending it over the wire.  It
1019  * also has the side-effect of ignoring user-excludes if delete_excluded
1020  * is set (so that the delete list includes user-excluded files).
1021  **/
1022 struct file_list *send_file_list(int f, int argc, char *argv[])
1023 {
1024         int l;
1025         STRUCT_STAT st;
1026         char *p, *dir, olddir[sizeof curr_dir];
1027         char lastpath[MAXPATHLEN] = "";
1028         struct file_list *flist;
1029         int64 start_write;
1030         int use_ff_fd = 0;
1031
1032         if (show_filelist_p() && f != -1)
1033                 start_filelist_progress("building file list");
1034
1035         start_write = stats.total_written;
1036
1037         flist = flist_new();
1038
1039         if (f != -1) {
1040                 io_start_buffering_out(f);
1041                 if (filesfrom_fd >= 0) {
1042                         if (argv[0] && !push_dir(argv[0])) {
1043                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1044                                         full_fname(argv[0]), strerror(errno));
1045                                 exit_cleanup(RERR_FILESELECT);
1046                         }
1047                         use_ff_fd = 1;
1048                 }
1049         }
1050
1051         while (1) {
1052                 char fname2[MAXPATHLEN];
1053                 char *fname = fname2;
1054
1055                 if (use_ff_fd) {
1056                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1057                                 break;
1058                         sanitize_path(fname, NULL);
1059                 } else {
1060                         if (argc-- == 0)
1061                                 break;
1062                         strlcpy(fname, *argv++, MAXPATHLEN);
1063                         if (sanitize_paths)
1064                                 sanitize_path(fname, NULL);
1065                 }
1066
1067                 l = strlen(fname);
1068                 if (fname[l - 1] == '/') {
1069                         if (l == 2 && fname[0] == '.') {
1070                                 /* Turn "./" into just "." rather than "./." */
1071                                 fname[1] = '\0';
1072                         } else if (l < MAXPATHLEN) {
1073                                 fname[l++] = '.';
1074                                 fname[l] = '\0';
1075                         }
1076                 }
1077
1078                 if (link_stat(fname, &st) != 0) {
1079                         if (f != -1) {
1080                                 io_error |= IOERR_GENERAL;
1081                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1082                                         full_fname(fname), strerror(errno));
1083                         }
1084                         continue;
1085                 }
1086
1087                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1088                         rprintf(FINFO, "skipping directory %s\n", fname);
1089                         continue;
1090                 }
1091
1092                 dir = NULL;
1093                 olddir[0] = '\0';
1094
1095                 if (!relative_paths) {
1096                         p = strrchr(fname, '/');
1097                         if (p) {
1098                                 *p = 0;
1099                                 if (p == fname)
1100                                         dir = "/";
1101                                 else
1102                                         dir = fname;
1103                                 fname = p + 1;
1104                         }
1105                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1106                         /* this ensures we send the intermediate directories,
1107                            thus getting their permissions right */
1108                         char *lp = lastpath, *fn = fname, *slash = fname;
1109                         *p = 0;
1110                         /* Skip any initial directories in our path that we
1111                          * have in common with lastpath. */
1112                         while (*fn && *lp == *fn) {
1113                                 if (*fn == '/')
1114                                         slash = fn;
1115                                 lp++, fn++;
1116                         }
1117                         *p = '/';
1118                         if (fn != p || (*lp && *lp != '/')) {
1119                                 int copy_links_saved = copy_links;
1120                                 int recurse_saved = recurse;
1121                                 copy_links = copy_unsafe_links;
1122                                 /* set recurse to 1 to prevent make_file
1123                                  * from ignoring directory, but still
1124                                  * turn off the recursive parameter to
1125                                  * send_file_name */
1126                                 recurse = 1;
1127                                 while ((slash = strchr(slash+1, '/')) != 0) {
1128                                         *slash = 0;
1129                                         send_file_name(f, flist, fname, 0, 0);
1130                                         *slash = '/';
1131                                 }
1132                                 copy_links = copy_links_saved;
1133                                 recurse = recurse_saved;
1134                                 *p = 0;
1135                                 strlcpy(lastpath, fname, sizeof lastpath);
1136                                 *p = '/';
1137                         }
1138                 }
1139
1140                 if (!*fname)
1141                         fname = ".";
1142
1143                 if (dir && *dir) {
1144                         static char *lastdir;
1145                         static int lastdir_len;
1146
1147                         strcpy(olddir, curr_dir); /* can't overflow */
1148
1149                         if (!push_dir(dir)) {
1150                                 io_error |= IOERR_GENERAL;
1151                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1152                                         full_fname(dir), strerror(errno));
1153                                 continue;
1154                         }
1155
1156                         if (lastdir && strcmp(lastdir, dir) == 0) {
1157                                 flist_dir = lastdir;
1158                                 flist_dir_len = lastdir_len;
1159                         } else {
1160                                 flist_dir = lastdir = strdup(dir);
1161                                 flist_dir_len = lastdir_len = strlen(dir);
1162                         }
1163                 }
1164
1165                 if (one_file_system)
1166                         set_filesystem(fname);
1167
1168                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1169
1170                 if (olddir[0]) {
1171                         flist_dir = NULL;
1172                         flist_dir_len = 0;
1173                         if (!pop_dir(olddir)) {
1174                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1175                                         full_fname(dir), strerror(errno));
1176                                 exit_cleanup(RERR_FILESELECT);
1177                         }
1178                 }
1179         }
1180
1181         if (f != -1) {
1182                 send_file_entry(NULL, f, 0);
1183
1184                 if (show_filelist_p())
1185                         finish_filelist_progress(flist);
1186         }
1187
1188         clean_flist(flist, 0, 0);
1189
1190         if (f != -1) {
1191                 /* Now send the uid/gid list. This was introduced in
1192                  * protocol version 15 */
1193                 send_uid_list(f);
1194
1195                 /* send the io_error flag */
1196                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1197
1198                 io_end_buffering();
1199                 stats.flist_size = stats.total_written - start_write;
1200                 stats.num_files = flist->count;
1201                 if (write_batch)
1202                         write_batch_flist_info(flist->count, flist->files);
1203         }
1204
1205         if (verbose > 3)
1206                 output_flist(flist);
1207
1208         if (verbose > 2)
1209                 rprintf(FINFO, "send_file_list done\n");
1210
1211         return flist;
1212 }
1213
1214
1215 struct file_list *recv_file_list(int f)
1216 {
1217         struct file_list *flist;
1218         unsigned short flags;
1219         int64 start_read;
1220         extern int list_only;
1221
1222         if (show_filelist_p())
1223                 start_filelist_progress("receiving file list");
1224
1225         start_read = stats.total_read;
1226
1227         flist = new(struct file_list);
1228         if (!flist)
1229                 goto oom;
1230
1231         flist->count = 0;
1232         flist->malloced = 1000;
1233         flist->files = new_array(struct file_struct *, flist->malloced);
1234         if (!flist->files)
1235                 goto oom;
1236
1237
1238         while ((flags = read_byte(f)) != 0) {
1239                 int i = flist->count;
1240
1241                 flist_expand(flist);
1242
1243                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1244                         flags |= read_byte(f) << 8;
1245                 receive_file_entry(&flist->files[i], flags, f);
1246
1247                 if (S_ISREG(flist->files[i]->mode))
1248                         stats.total_size += flist->files[i]->length;
1249
1250                 flist->count++;
1251
1252                 maybe_emit_filelist_progress(flist);
1253
1254                 if (verbose > 2) {
1255                         rprintf(FINFO, "recv_file_name(%s)\n",
1256                                 f_name(flist->files[i]));
1257                 }
1258         }
1259         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1260
1261         if (verbose > 2)
1262                 rprintf(FINFO, "received %d names\n", flist->count);
1263
1264         if (show_filelist_p())
1265                 finish_filelist_progress(flist);
1266
1267         clean_flist(flist, relative_paths, 1);
1268
1269         if (f != -1) {
1270                 /* Now send the uid/gid list. This was introduced in
1271                  * protocol version 15 */
1272                 recv_uid_list(f, flist);
1273
1274                 if (!read_batch) {
1275                         /* Recv the io_error flag */
1276                         if (lp_ignore_errors(module_id) || ignore_errors)
1277                                 read_int(f);
1278                         else
1279                                 io_error |= read_int(f);
1280                 }
1281         }
1282
1283         if (verbose > 3)
1284                 output_flist(flist);
1285
1286         if (list_only) {
1287                 int i;
1288                 for (i = 0; i < flist->count; i++)
1289                         list_file_entry(flist->files[i]);
1290         }
1291
1292         if (verbose > 2)
1293                 rprintf(FINFO, "recv_file_list done\n");
1294
1295         stats.flist_size = stats.total_read - start_read;
1296         stats.num_files = flist->count;
1297
1298         return flist;
1299
1300       oom:
1301         out_of_memory("recv_file_list");
1302         return NULL;            /* not reached */
1303 }
1304
1305
1306 int file_compare(struct file_struct **file1, struct file_struct **file2)
1307 {
1308         struct file_struct *f1 = *file1;
1309         struct file_struct *f2 = *file2;
1310
1311         if (!f1->basename && !f2->basename)
1312                 return 0;
1313         if (!f1->basename)
1314                 return -1;
1315         if (!f2->basename)
1316                 return 1;
1317         if (f1->dirname == f2->dirname)
1318                 return u_strcmp(f1->basename, f2->basename);
1319         return f_name_cmp(f1, f2);
1320 }
1321
1322
1323 int flist_find(struct file_list *flist, struct file_struct *f)
1324 {
1325         int low = 0, high = flist->count - 1;
1326
1327         while (high >= 0 && !flist->files[high]->basename) high--;
1328
1329         if (high < 0)
1330                 return -1;
1331
1332         while (low != high) {
1333                 int mid = (low + high) / 2;
1334                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1335                 if (ret == 0)
1336                         return flist_up(flist, mid);
1337                 if (ret > 0)
1338                         high = mid;
1339                 else
1340                         low = mid + 1;
1341         }
1342
1343         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1344                 return flist_up(flist, low);
1345         return -1;
1346 }
1347
1348
1349 /*
1350  * Free up any resources a file_struct has allocated, and optionally free
1351  * it up as well.
1352  */
1353 void free_file(struct file_struct *file, int free_the_struct)
1354 {
1355         if (free_the_struct)
1356                 free(file);
1357         else
1358                 memset(file, 0, min_file_struct_len);
1359 }
1360
1361
1362 /*
1363  * allocate a new file list
1364  */
1365 struct file_list *flist_new(void)
1366 {
1367         struct file_list *flist;
1368
1369         flist = new(struct file_list);
1370         if (!flist)
1371                 out_of_memory("send_file_list");
1372
1373         flist->count = 0;
1374         flist->malloced = 0;
1375         flist->files = NULL;
1376
1377         return flist;
1378 }
1379
1380 /*
1381  * free up all elements in a flist
1382  */
1383 void flist_free(struct file_list *flist)
1384 {
1385         int i;
1386         for (i = 1; i < flist->count; i++)
1387                 free_file(flist->files[i], FREE_STRUCT);
1388         free(flist->files);
1389         free(flist);
1390 }
1391
1392
1393 /*
1394  * This routine ensures we don't have any duplicate names in our file list.
1395  * duplicate names can cause corruption because of the pipelining
1396  */
1397 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1398 {
1399         int i, prev_i = 0;
1400
1401         if (!flist || flist->count == 0)
1402                 return;
1403
1404         qsort(flist->files, flist->count,
1405               sizeof flist->files[0], (int (*)()) file_compare);
1406
1407         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1408                 if (flist->files[i]->basename) {
1409                         prev_i = i;
1410                         break;
1411                 }
1412         }
1413         while (++i < flist->count) {
1414                 if (!flist->files[i]->basename)
1415                         continue;
1416                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1417                         if (verbose > 1 && !am_server) {
1418                                 rprintf(FINFO,
1419                                         "removing duplicate name %s from file list %d\n",
1420                                         f_name(flist->files[i]), i);
1421                         }
1422                         /* Make sure that if we unduplicate '.', that we don't
1423                          * lose track of a user-specified starting point (or
1424                          * else deletions will mysteriously fail with -R). */
1425                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1426                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1427                         free_file(flist->files[i], CLEAR_STRUCT);
1428                 } else
1429                         prev_i = i;
1430         }
1431
1432         if (strip_root) {
1433                 /* we need to strip off the root directory in the case
1434                    of relative paths, but this must be done _after_
1435                    the sorting phase */
1436                 for (i = 0; i < flist->count; i++) {
1437                         if (flist->files[i]->dirname &&
1438                             flist->files[i]->dirname[0] == '/') {
1439                                 memmove(&flist->files[i]->dirname[0],
1440                                         &flist->files[i]->dirname[1],
1441                                         strlen(flist->files[i]->dirname));
1442                         }
1443
1444                         if (flist->files[i]->dirname &&
1445                             !flist->files[i]->dirname[0]) {
1446                                 flist->files[i]->dirname = NULL;
1447                         }
1448                 }
1449         }
1450 }
1451
1452 static void output_flist(struct file_list *flist)
1453 {
1454         char uidbuf[16], gidbuf[16];
1455         struct file_struct *file;
1456         int i;
1457
1458         for (i = 0; i < flist->count; i++) {
1459                 file = flist->files[i];
1460                 if (am_root && preserve_uid)
1461                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1462                 else
1463                         *uidbuf = '\0';
1464                 if (preserve_gid && file->gid != GID_NONE)
1465                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1466                 else
1467                         *gidbuf = '\0';
1468                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1469                         who_am_i(), i, NS(file->basedir), NS(file->dirname),
1470                         NS(file->basename), (int) file->mode,
1471                         (double) file->length, uidbuf, gidbuf);
1472         }
1473 }
1474
1475
1476 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1477
1478 /* Compare the names of two file_struct entities, just like strcmp()
1479  * would do if it were operating on the joined strings.  We assume
1480  * that there are no 0-length strings.
1481  */
1482 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1483 {
1484         int dif;
1485         const uchar *c1, *c2;
1486         enum fnc_state state1, state2;
1487
1488         if (!f1 || !f1->basename) {
1489                 if (!f2 || !f2->basename)
1490                         return 0;
1491                 return -1;
1492         }
1493         if (!f2 || !f2->basename)
1494                 return 1;
1495
1496         if (!(c1 = (uchar*)f1->dirname)) {
1497                 state1 = fnc_BASE;
1498                 c1 = (uchar*)f1->basename;
1499         } else
1500                 state1 = fnc_DIR;
1501         if (!(c2 = (uchar*)f2->dirname)) {
1502                 state2 = fnc_BASE;
1503                 c2 = (uchar*)f2->basename;
1504         } else
1505                 state2 = fnc_DIR;
1506
1507         while (1) {
1508                 if ((dif = (int)*c1 - (int)*c2) != 0)
1509                         break;
1510                 if (!*++c1) {
1511                         switch (state1) {
1512                         case fnc_DIR:
1513                                 state1 = fnc_SLASH;
1514                                 c1 = (uchar*)"/";
1515                                 break;
1516                         case fnc_SLASH:
1517                                 state1 = fnc_BASE;
1518                                 c1 = (uchar*)f1->basename;
1519                                 break;
1520                         case fnc_BASE:
1521                                 break;
1522                         }
1523                 }
1524                 if (!*++c2) {
1525                         switch (state2) {
1526                         case fnc_DIR:
1527                                 state2 = fnc_SLASH;
1528                                 c2 = (uchar*)"/";
1529                                 break;
1530                         case fnc_SLASH:
1531                                 state2 = fnc_BASE;
1532                                 c2 = (uchar*)f2->basename;
1533                                 break;
1534                         case fnc_BASE:
1535                                 if (!*c1)
1536                                         return 0;
1537                                 break;
1538                         }
1539                 }
1540         }
1541
1542         return dif;
1543 }
1544
1545
1546 /* Return a copy of the full filename of a flist entry, using the indicated
1547  * buffer.  No size-checking is done because we checked the size when creating
1548  * the file_struct entry.
1549  */
1550 char *f_name_to(struct file_struct *f, char *fbuf)
1551 {
1552         if (!f || !f->basename)
1553                 return NULL;
1554
1555         if (f->dirname) {
1556                 int len = strlen(f->dirname);
1557                 memcpy(fbuf, f->dirname, len);
1558                 fbuf[len] = '/';
1559                 strcpy(fbuf + len + 1, f->basename);
1560         } else
1561                 strcpy(fbuf, f->basename);
1562         return fbuf;
1563 }
1564
1565
1566 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1567  */
1568 char *f_name(struct file_struct *f)
1569 {
1570         static char names[5][MAXPATHLEN];
1571         static unsigned int n;
1572
1573         n = (n + 1) % (sizeof names / sizeof names[0]);
1574
1575         return f_name_to(f, names[n]);
1576 }