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
  40 extern int cvs_exclude;
  41
  42 extern int recurse;
  43 extern char curr_dir[MAXPATHLEN];
  44 extern char *files_from;
  45 extern int filesfrom_fd;
  46
  47 extern int one_file_system;
  48 extern int make_backups;
  49 extern int preserve_links;
  50 extern int preserve_hard_links;
  51 extern int preserve_perms;
  52 extern int preserve_devices;
  53 extern int preserve_uid;
  54 extern int preserve_gid;
  55 extern int preserve_times;
  56 extern int relative_paths;
  57 extern int implied_dirs;
  58 extern int copy_links;
  59 extern int copy_unsafe_links;
  60 extern int protocol_version;
  61 extern int sanitize_paths;
  62
  63 extern int read_batch;
  64 extern int write_batch;
  65
  66 extern struct exclude_struct **exclude_list;
  67 extern struct exclude_struct **server_exclude_list;
  68 extern struct exclude_struct **local_exclude_list;
  69
  70 int io_error;
  71
  72 static char empty_sum[MD4_SUM_LENGTH];
  73 static unsigned int min_file_struct_len;
  74
  75 static void clean_flist(struct file_list *flist, int strip_root, int no_dups);
  76 static void output_flist(struct file_list *flist);
  77
  78
  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     min_file_struct_len = ((char*)&f.flags - (char*)&f) + sizeof f.flags;
  85 }
  86
  87
  88 static int show_filelist_p(void)
  89 {
  90         return verbose && (recurse || files_from) && !am_server;
  91 }
  92
  93 static void start_filelist_progress(char *kind)
  94 {
  95         rprintf(FINFO, "%s ... ", kind);
  96         if ((verbose > 1) || do_progress)
  97                 rprintf(FINFO, "\n");
  98         rflush(FINFO);
  99 }
 100
 101
 102 static void emit_filelist_progress(const struct file_list *flist)
 103 {
 104         rprintf(FINFO, " %d files...\r", flist->count);
 105 }
 106
 107
 108 static void maybe_emit_filelist_progress(const struct file_list *flist)
 109 {
 110         if (do_progress && show_filelist_p() && ((flist->count % 100) == 0))
 111                 emit_filelist_progress(flist);
 112 }
 113
 114
 115 static void finish_filelist_progress(const struct file_list *flist)
 116 {
 117         if (do_progress) {
 118                 /* This overwrites the progress line */
 119                 rprintf(FINFO, "%d file%sto consider\n",
 120                         flist->count, flist->count == 1 ? " " : "s ");
 121         } else
 122                 rprintf(FINFO, "done\n");
 123 }
 124
 125 void show_flist_stats(void)
 126 {
 127         /* Nothing yet */
 128 }
 129
 130
 131 static void list_file_entry(struct file_struct *f)
 132 {
 133         char perms[11];
 134
 135         if (!f->basename)
 136                 /* this can happen if duplicate names were removed */
 137                 return;
 138
 139         permstring(perms, f->mode);
 140
 141 #if SUPPORT_LINKS
 142         if (preserve_links && S_ISLNK(f->mode)) {
 143                 rprintf(FINFO, "%s %11.0f %s %s -> %s\n",
 144                         perms,
 145                         (double) f->length, timestring(f->modtime),
 146                         f_name(f), f->u.link);
 147         } else
 148 #endif
 149                 rprintf(FINFO, "%s %11.0f %s %s\n",
 150                         perms,
 151                         (double) f->length, timestring(f->modtime),
 152                         f_name(f));
 153 }
 154
 155
 156 /**
 157  * Stat either a symlink or its referent, depending on the settings of
 158  * copy_links, copy_unsafe_links, etc.
 159  *
 160  * @retval -1 on error
 161  *
 162  * @retval 0 for success
 163  *
 164  * @post If @p path is a symlink, then @p linkbuf (of size @c
 165  * MAXPATHLEN) contains the symlink target.
 166  *
 167  * @post @p buffer contains information about the link or the
 168  * referrent as appropriate, if they exist.
 169  **/
 170 int readlink_stat(const char *path, STRUCT_STAT *buffer, char *linkbuf)
 171 {
 172 #if SUPPORT_LINKS
 173         if (copy_links)
 174                 return do_stat(path, buffer);
 175         if (do_lstat(path, buffer) == -1)
 176                 return -1;
 177         if (S_ISLNK(buffer->st_mode)) {
 178                 int l = readlink((char *) path, linkbuf, MAXPATHLEN - 1);
 179                 if (l == -1)
 180                         return -1;
 181                 linkbuf[l] = 0;
 182                 if (copy_unsafe_links && unsafe_symlink(linkbuf, path)) {
 183                         if (verbose > 1) {
 184                                 rprintf(FINFO,"copying unsafe symlink \"%s\" -> \"%s\"\n",
 185                                         path, linkbuf);
 186                         }
 187                         return do_stat(path, buffer);
 188                 }
 189         }
 190         return 0;
 191 #else
 192         return do_stat(path, buffer);
 193 #endif
 194 }
 195
 196 int link_stat(const char *path, STRUCT_STAT * buffer)
 197 {
 198 #if SUPPORT_LINKS
 199         if (copy_links)
 200                 return do_stat(path, buffer);
 201         return do_lstat(path, buffer);
 202 #else
 203         return do_stat(path, buffer);
 204 #endif
 205 }
 206
 207 /*
 208  * This function is used to check if a file should be included/excluded
 209  * from the list of files based on its name and type etc.  The value of
 210  * exclude_level is set to either SERVER_EXCLUDES or ALL_EXCLUDES.
 211  */
 212 static int check_exclude_file(char *fname, int is_dir, int exclude_level)
 213 {
 214 #if 0 /* This currently never happens, so avoid a useless compare. */
 215         if (exclude_level == NO_EXCLUDES)
 216                 return 0;
 217 #endif
 218         if (fname) {
 219                 /* never exclude '.', even if somebody does --exclude '*' */
 220                 if (fname[0] == '.' && !fname[1])
 221                         return 0;
 222                 /* Handle the -R version of the '.' dir. */
 223                 if (fname[0] == '/') {
 224                         int len = strlen(fname);
 225                         if (fname[len-1] == '.' && fname[len-2] == '/')
 226                                 return 0;
 227                 }
 228         }
 229         if (server_exclude_list
 230          && check_exclude(server_exclude_list, fname, is_dir))
 231                 return 1;
 232         if (exclude_level != ALL_EXCLUDES)
 233                 return 0;
 234         if (exclude_list && check_exclude(exclude_list, fname, is_dir))
 235                 return 1;
 236         if (local_exclude_list
 237          && check_exclude(local_exclude_list, fname, is_dir))
 238                 return 1;
 239         return 0;
 240 }
 241
 242 /* used by the one_file_system code */
 243 static dev_t filesystem_dev;
 244
 245 static void set_filesystem(char *fname)
 246 {
 247         STRUCT_STAT st;
 248         if (link_stat(fname, &st) != 0)
 249                 return;
 250         filesystem_dev = st.st_dev;
 251 }
 252
 253
 254 static int to_wire_mode(mode_t mode)
 255 {
 256 #if SUPPORT_LINKS
 257         if (S_ISLNK(mode) && (_S_IFLNK != 0120000))
 258                 return (mode & ~(_S_IFMT)) | 0120000;
 259 #endif
 260         return (int) mode;
 261 }
 262
 263 static mode_t from_wire_mode(int mode)
 264 {
 265         if ((mode & (_S_IFMT)) == 0120000 && (_S_IFLNK != 0120000))
 266                 return (mode & ~(_S_IFMT)) | _S_IFLNK;
 267         return (mode_t) mode;
 268 }
 269
 270
 271 static void send_directory(int f, struct file_list *flist, char *dir);
 272
 273 static char *flist_dir;
 274 static int flist_dir_len;
 275
 276
 277 /**
 278  * Make sure @p flist is big enough to hold at least @p flist->count
 279  * entries.
 280  **/
 281 static void flist_expand(struct file_list *flist)
 282 {
 283         if (flist->count >= flist->malloced) {
 284                 void *new_ptr;
 285
 286                 if (flist->malloced < 1000)
 287                         flist->malloced += 1000;
 288                 else
 289                         flist->malloced *= 2;
 290
 291                 if (flist->files) {
 292                         new_ptr = realloc_array(flist->files,
 293                                                 struct file_struct *,
 294                                                 flist->malloced);
 295                 } else {
 296                         new_ptr = new_array(struct file_struct *,
 297                                             flist->malloced);
 298                 }
 299
 300                 if (verbose >= 2) {
 301                         rprintf(FINFO, "[%s] expand file_list to %.0f bytes, did%s move\n",
 302                             who_am_i(),
 303                             (double) sizeof flist->files[0] * flist->malloced,
 304                             (new_ptr == flist->files) ? " not" : "");
 305                 }
 306
 307                 flist->files = (struct file_struct **) new_ptr;
 308
 309                 if (!flist->files)
 310                         out_of_memory("flist_expand");
 311         }
 312 }
 313
 314 void send_file_entry(struct file_struct *file, int f, unsigned short base_flags)
 315 {
 316         unsigned short flags;
 317         static time_t modtime;
 318         static mode_t mode;
 319         static DEV64_T rdev, rdev_high;
 320         static DEV64_T dev;
 321         static uid_t uid;
 322         static gid_t gid;
 323         static char lastname[MAXPATHLEN];
 324         char *fname, fbuf[MAXPATHLEN];
 325         int l1, l2;
 326
 327         if (f == -1)
 328                 return;
 329
 330         if (!file) {
 331                 write_byte(f, 0);
 332                 modtime = 0, mode = 0;
 333                 rdev = 0, rdev_high = 0, dev = 0;
 334                 uid = 0, gid = 0;
 335                 *lastname = '\0';
 336                 return;
 337         }
 338
 339         io_write_phase = "send_file_entry";
 340
 341         fname = f_name_to(file, fbuf);
 342
 343         flags = base_flags;
 344
 345         if (file->mode == mode)
 346                 flags |= XMIT_SAME_MODE;
 347         else
 348                 mode = file->mode;
 349         if (preserve_devices) {
 350                 if (protocol_version < 28) {
 351                         if (IS_DEVICE(mode)) {
 352                                 if (file->u.rdev == rdev) {
 353                                         /* Set both flags to simplify the test
 354                                          * when writing the data. */
 355                                         flags |= XMIT_SAME_RDEV_pre28
 356                                                | XMIT_SAME_HIGH_RDEV;
 357                                 } else
 358                                         rdev = file->u.rdev;
 359                         } else
 360                                 rdev = 0;
 361                 } else if (IS_DEVICE(mode)) {
 362                         if ((file->u.rdev & ~0xFF) == rdev_high)
 363                                 flags |= XMIT_SAME_HIGH_RDEV;
 364                         else {
 365                                 rdev = file->u.rdev;
 366                                 rdev_high = rdev & ~0xFF;
 367                         }
 368                 }
 369         }
 370         if (file->uid == uid)
 371                 flags |= XMIT_SAME_UID;
 372         else
 373                 uid = file->uid;
 374         if (file->gid == gid)
 375                 flags |= XMIT_SAME_GID;
 376         else
 377                 gid = file->gid;
 378         if (file->modtime == modtime)
 379                 flags |= XMIT_SAME_TIME;
 380         else
 381                 modtime = file->modtime;
 382
 383 #if SUPPORT_HARD_LINKS
 384         if (file->link_u.idev) {
 385                 if (file->F_DEV == dev) {
 386                         if (protocol_version >= 28)
 387                                 flags |= XMIT_SAME_DEV;
 388                 } else
 389                         dev = file->F_DEV;
 390                 flags |= XMIT_HAS_IDEV_DATA;
 391         }
 392 #endif
 393
 394         for (l1 = 0;
 395              lastname[l1] && (fname[l1] == lastname[l1]) && (l1 < 255);
 396              l1++) {}
 397         l2 = strlen(fname+l1);
 398
 399         if (l1 > 0)
 400                 flags |= XMIT_SAME_NAME;
 401         if (l2 > 255)
 402                 flags |= XMIT_LONG_NAME;
 403
 404         /* We must make sure we don't send a zero flag byte or the
 405          * other end will terminate the flist transfer.  Note that
 406          * the use of XMIT_TOP_DIR on a non-dir has no meaning, so
 407          * it's harmless way to add a bit to the first flag byte. */
 408         if (protocol_version >= 28) {
 409                 if (!flags && !S_ISDIR(mode))
 410                         flags |= XMIT_TOP_DIR;
 411                 if ((flags & 0xFF00) || !flags) {
 412                         flags |= XMIT_EXTENDED_FLAGS;
 413                         write_byte(f, flags);
 414                         write_byte(f, flags >> 8);
 415                 } else
 416                         write_byte(f, flags);
 417         } else {
 418                 if (!(flags & 0xFF) && !S_ISDIR(mode))
 419                         flags |= XMIT_TOP_DIR;
 420                 if (!(flags & 0xFF))
 421                         flags |= XMIT_LONG_NAME;
 422                 write_byte(f, flags);
 423         }
 424         if (flags & XMIT_SAME_NAME)
 425                 write_byte(f, l1);
 426         if (flags & XMIT_LONG_NAME)
 427                 write_int(f, l2);
 428         else
 429                 write_byte(f, l2);
 430         write_buf(f, fname + l1, l2);
 431
 432         write_longint(f, file->length);
 433         if (!(flags & XMIT_SAME_TIME))
 434                 write_int(f, modtime);
 435         if (!(flags & XMIT_SAME_MODE))
 436                 write_int(f, to_wire_mode(mode));
 437         if (preserve_uid && !(flags & XMIT_SAME_UID)) {
 438                 add_uid(uid);
 439                 write_int(f, uid);
 440         }
 441         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 442                 add_gid(gid);
 443                 write_int(f, gid);
 444         }
 445         if (preserve_devices && IS_DEVICE(mode)) {
 446                 /* If XMIT_SAME_HIGH_RDEV is off, XMIT_SAME_RDEV_pre28 is
 447                  * also off. */
 448                 if (!(flags & XMIT_SAME_HIGH_RDEV))
 449                         write_int(f, rdev);
 450                 else if (protocol_version >= 28)
 451                         write_byte(f, rdev);
 452         }
 453
 454 #if SUPPORT_LINKS
 455         if (preserve_links && S_ISLNK(mode)) {
 456                 int len = strlen(file->u.link);
 457                 write_int(f, len);
 458                 write_buf(f, file->u.link, len);
 459         }
 460 #endif
 461
 462 #if SUPPORT_HARD_LINKS
 463         if (flags & XMIT_HAS_IDEV_DATA) {
 464                 if (protocol_version < 26) {
 465                         /* 32-bit dev_t and ino_t */
 466                         write_int(f, dev);
 467                         write_int(f, file->F_INODE);
 468                 } else {
 469                         /* 64-bit dev_t and ino_t */
 470                         if (!(flags & XMIT_SAME_DEV))
 471                                 write_longint(f, dev);
 472                         write_longint(f, file->F_INODE);
 473                 }
 474         }
 475 #endif
 476
 477         if (always_checksum) {
 478                 char *sum;
 479                 if (S_ISREG(mode))
 480                         sum = file->u.sum;
 481                 else if (protocol_version < 28) {
 482                         /* Prior to 28, we sent a useless set of nulls. */
 483                         sum = empty_sum;
 484                 } else
 485                         sum = NULL;
 486                 if (sum) {
 487                         write_buf(f, sum, protocol_version < 21? 2
 488                                                         : MD4_SUM_LENGTH);
 489                 }
 490         }
 491
 492         strlcpy(lastname, fname, MAXPATHLEN);
 493
 494         io_write_phase = "unknown";
 495 }
 496
 497
 498
 499 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 500 {
 501         static time_t modtime;
 502         static mode_t mode;
 503         static DEV64_T rdev, rdev_high;
 504         static DEV64_T dev;
 505         static uid_t uid;
 506         static gid_t gid;
 507         static char lastname[MAXPATHLEN], *lastdir;
 508         static int lastdir_len = -1;
 509         char thisname[MAXPATHLEN];
 510         unsigned int l1 = 0, l2 = 0;
 511         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 512         int file_struct_len, idev_len;
 513         OFF_T file_length;
 514         char *basename, *dirname, *bp;
 515         struct file_struct *file;
 516
 517         if (!fptr) {
 518                 modtime = 0, mode = 0;
 519                 rdev = 0, rdev_high = 0, dev = 0;
 520                 uid = 0, gid = 0;
 521                 *lastname = '\0';
 522                 return;
 523         }
 524
 525         if (flags & XMIT_SAME_NAME)
 526                 l1 = read_byte(f);
 527
 528         if (flags & XMIT_LONG_NAME)
 529                 l2 = read_int(f);
 530         else
 531                 l2 = read_byte(f);
 532
 533         if (l2 >= MAXPATHLEN - l1) {
 534                 rprintf(FERROR,
 535                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 536                         flags, l1, l2, lastname);
 537                 overflow("receive_file_entry");
 538         }
 539
 540         strlcpy(thisname, lastname, l1 + 1);
 541         read_sbuf(f, &thisname[l1], l2);
 542         thisname[l1 + l2] = 0;
 543
 544         strlcpy(lastname, thisname, MAXPATHLEN);
 545
 546         clean_fname(thisname);
 547
 548         if (sanitize_paths)
 549                 sanitize_path(thisname, NULL);
 550
 551         if ((basename = strrchr(thisname, '/')) != NULL) {
 552                 dirname_len = ++basename - thisname; /* counts future '\0' */
 553                 if (lastdir_len == dirname_len - 1
 554                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 555                         dirname = lastdir;
 556                         dirname_len = 0; /* indicates no copy is needed */
 557                 } else
 558                         dirname = thisname;
 559         } else {
 560                 basename = thisname;
 561                 dirname = NULL;
 562                 dirname_len = 0;
 563         }
 564         basename_len = strlen(basename) + 1; /* count the '\0' */
 565
 566         file_length = read_longint(f);
 567         if (!(flags & XMIT_SAME_TIME))
 568                 modtime = (time_t)read_int(f);
 569         if (!(flags & XMIT_SAME_MODE))
 570                 mode = from_wire_mode(read_int(f));
 571
 572         if (preserve_uid && !(flags & XMIT_SAME_UID))
 573                 uid = (uid_t)read_int(f);
 574         if (preserve_gid && !(flags & XMIT_SAME_GID))
 575                 gid = (gid_t)read_int(f);
 576
 577         if (preserve_devices) {
 578                 if (protocol_version < 28) {
 579                         if (IS_DEVICE(mode)) {
 580                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 581                                         rdev = (DEV64_T)read_int(f);
 582                         } else
 583                                 rdev = 0;
 584                 } else if (IS_DEVICE(mode)) {
 585                         if (!(flags & XMIT_SAME_HIGH_RDEV)) {
 586                                 rdev = (DEV64_T)read_int(f);
 587                                 rdev_high = rdev & ~0xFF;
 588                         } else
 589                                 rdev = rdev_high | (DEV64_T)read_byte(f);
 590                 }
 591         }
 592
 593 #if SUPPORT_LINKS
 594         if (preserve_links && S_ISLNK(mode)) {
 595                 linkname_len = read_int(f) + 1; /* count the '\0' */
 596                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 597                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 598                                 linkname_len - 1);
 599                         overflow("receive_file_entry");
 600                 }
 601         }
 602         else
 603 #endif
 604                 linkname_len = 0;
 605
 606 #if SUPPORT_HARD_LINKS
 607         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 608                 flags |= XMIT_HAS_IDEV_DATA;
 609         if (flags & XMIT_HAS_IDEV_DATA)
 610                 idev_len = sizeof (struct idev);
 611         else
 612 #endif
 613                 idev_len = 0;
 614
 615         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 616         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
 617
 618         alloc_len = file_struct_len + dirname_len + basename_len
 619                   + linkname_len + sum_len + idev_len;
 620         if (!(bp = new_array(char, alloc_len)))
 621                 out_of_memory("receive_file_entry");
 622         file = *fptr = (struct file_struct *)bp;
 623         memset(bp, 0, min_file_struct_len);
 624         bp += file_struct_len;
 625
 626         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
 627         file->modtime = modtime;
 628         file->length = file_length;
 629         file->mode = mode;
 630         file->uid = uid;
 631         file->gid = gid;
 632
 633 #if SUPPORT_HARD_LINKS
 634         if (idev_len) {
 635                 file->link_u.idev = (struct idev *)bp;
 636                 bp += idev_len;
 637         }
 638 #endif
 639
 640         if (dirname_len) {
 641                 file->dirname = lastdir = bp;
 642                 lastdir_len = dirname_len - 1;
 643                 memcpy(bp, dirname, dirname_len - 1);
 644                 bp += dirname_len;
 645                 bp[-1] = '\0';
 646         } else if (dirname)
 647                 file->dirname = dirname;
 648
 649         file->basename = bp;
 650         memcpy(bp, basename, basename_len);
 651         bp += basename_len;
 652
 653         if (preserve_devices && IS_DEVICE(mode))
 654                 file->u.rdev = rdev;
 655
 656 #if SUPPORT_LINKS
 657         if (linkname_len) {
 658                 file->u.link = bp;
 659                 read_sbuf(f, bp, linkname_len - 1);
 660                 if (sanitize_paths)
 661                         sanitize_path(bp, lastdir);
 662                 bp += linkname_len;
 663         }
 664 #endif
 665
 666 #if SUPPORT_HARD_LINKS
 667         if (idev_len) {
 668                 if (protocol_version < 26) {
 669                         dev = read_int(f);
 670                         file->F_INODE = read_int(f);
 671                 } else {
 672                         if (!(flags & XMIT_SAME_DEV))
 673                                 dev = read_longint(f);
 674                         file->F_INODE = read_longint(f);
 675                 }
 676                 file->F_DEV = dev;
 677         }
 678 #endif
 679
 680         if (always_checksum) {
 681                 char *sum;
 682                 if (sum_len) {
 683                         file->u.sum = sum = bp;
 684                         /*bp += sum_len;*/
 685                 } else if (protocol_version < 28) {
 686                         /* Prior to 28, we get a useless set of nulls. */
 687                         sum = empty_sum;
 688                 } else
 689                         sum = NULL;
 690                 if (sum) {
 691                         read_buf(f, sum, protocol_version < 21? 2
 692                                                 : MD4_SUM_LENGTH);
 693                 }
 694         }
 695
 696         if (!preserve_perms) {
 697                 extern int orig_umask;
 698                 /* set an appropriate set of permissions based on original
 699                  * permissions and umask. This emulates what GNU cp does */
 700                 file->mode &= ~orig_umask;
 701         }
 702 }
 703
 704
 705 /**
 706  * Create a file_struct for a named file by reading its stat()
 707  * information and performing extensive checks against global
 708  * options.
 709  *
 710  * @return the new file, or NULL if there was an error or this file
 711  * should be excluded.
 712  *
 713  * @todo There is a small optimization opportunity here to avoid
 714  * stat()ing the file in some circumstances, which has a certain cost.
 715  * We are called immediately after doing readdir(), and so we may
 716  * already know the d_type of the file.  We could for example avoid
 717  * statting directories if we're not recursing, but this is not a very
 718  * important case.  Some systems may not have d_type.
 719  **/
 720 struct file_struct *make_file(char *fname, int exclude_level)
 721 {
 722         static char *lastdir;
 723         static int lastdir_len = -1;
 724         struct file_struct *file;
 725         STRUCT_STAT st;
 726         char sum[SUM_LENGTH];
 727         char thisname[MAXPATHLEN];
 728         char linkname[MAXPATHLEN];
 729         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 730         int file_struct_len, idev_len;
 731         char *basename, *dirname, *bp;
 732         unsigned short flags = 0;
 733
 734         if (strlcpy(thisname, fname, sizeof thisname)
 735             >= sizeof thisname - flist_dir_len) {
 736                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 737                 return NULL;
 738         }
 739         clean_fname(thisname);
 740         if (sanitize_paths)
 741                 sanitize_path(thisname, NULL);
 742
 743         memset(sum, 0, SUM_LENGTH);
 744
 745         if (readlink_stat(thisname, &st, linkname) != 0) {
 746                 int save_errno = errno;
 747                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 748                         /* either symlink pointing nowhere or file that
 749                          * was removed during rsync run; see if excluded
 750                          * before reporting an error */
 751                         if (check_exclude_file(thisname, 0, exclude_level)) {
 752                                 /* file is excluded anyway, ignore silently */
 753                                 return NULL;
 754                         }
 755                 }
 756                 io_error |= IOERR_GENERAL;
 757                 rprintf(FERROR, "readlink %s failed: %s\n",
 758                         full_fname(thisname), strerror(save_errno));
 759                 return NULL;
 760         }
 761
 762         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 763         if (exclude_level == NO_EXCLUDES)
 764                 goto skip_excludes;
 765
 766         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 767                 rprintf(FINFO, "skipping directory %s\n", thisname);
 768                 return NULL;
 769         }
 770
 771         /* We only care about directories because we need to avoid recursing
 772          * into a mount-point directory, not to avoid copying a symlinked
 773          * file if -L (or similar) was specified. */
 774         if (one_file_system && st.st_dev != filesystem_dev
 775             && S_ISDIR(st.st_mode))
 776                 flags |= FLAG_MOUNT_POINT;
 777
 778         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
 779                 return NULL;
 780
 781         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
 782                 return NULL;
 783
 784       skip_excludes:
 785
 786         if (verbose > 2) {
 787                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 788                         who_am_i(), thisname, exclude_level);
 789         }
 790
 791         if ((basename = strrchr(thisname, '/')) != NULL) {
 792                 dirname_len = ++basename - thisname; /* counts future '\0' */
 793                 if (lastdir_len == dirname_len - 1
 794                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 795                         dirname = lastdir;
 796                         dirname_len = 0; /* indicates no copy is needed */
 797                 } else
 798                         dirname = thisname;
 799         } else {
 800                 basename = thisname;
 801                 dirname = NULL;
 802                 dirname_len = 0;
 803         }
 804         basename_len = strlen(basename) + 1; /* count the '\0' */
 805
 806 #if SUPPORT_LINKS
 807         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 808 #else
 809         linkname_len = 0;
 810 #endif
 811
 812 #if SUPPORT_HARD_LINKS
 813         if (preserve_hard_links) {
 814                 if (protocol_version < 28) {
 815                         if (S_ISREG(st.st_mode))
 816                                 idev_len = sizeof (struct idev);
 817                         else
 818                                 idev_len = 0;
 819                 } else {
 820                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 821                                 idev_len = sizeof (struct idev);
 822                         else
 823                                 idev_len = 0;
 824                 }
 825         } else
 826 #endif
 827                 idev_len = 0;
 828
 829         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 830         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
 831
 832         alloc_len = file_struct_len + dirname_len + basename_len
 833                   + linkname_len + sum_len + idev_len;
 834         if (!(bp = new_array(char, alloc_len)))
 835                 out_of_memory("receive_file_entry");
 836         file = (struct file_struct *)bp;
 837         memset(bp, 0, min_file_struct_len);
 838         bp += file_struct_len;
 839
 840         file->flags = flags;
 841         file->modtime = st.st_mtime;
 842         file->length = st.st_size;
 843         file->mode = st.st_mode;
 844         file->uid = st.st_uid;
 845         file->gid = st.st_gid;
 846
 847 #if SUPPORT_HARD_LINKS
 848         if (idev_len) {
 849                 file->link_u.idev = (struct idev *)bp;
 850                 bp += idev_len;
 851                 file->F_DEV = st.st_dev;
 852                 file->F_INODE = st.st_ino;
 853         }
 854 #endif
 855
 856         if (dirname_len) {
 857                 file->dirname = lastdir = bp;
 858                 lastdir_len = dirname_len - 1;
 859                 memcpy(bp, dirname, dirname_len - 1);
 860                 bp += dirname_len;
 861                 bp[-1] = '\0';
 862         } else if (dirname)
 863                 file->dirname = dirname;
 864
 865         file->basename = bp;
 866         memcpy(bp, basename, basename_len);
 867         bp += basename_len;
 868
 869 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 870         if (preserve_devices && IS_DEVICE(st.st_mode))
 871                 file->u.rdev = st.st_rdev;
 872 #endif
 873
 874 #if SUPPORT_LINKS
 875         if (linkname_len) {
 876                 file->u.link = bp;
 877                 memcpy(bp, linkname, linkname_len);
 878                 bp += linkname_len;
 879         }
 880 #endif
 881
 882         if (sum_len) {
 883                 file->u.sum = bp;
 884                 file_checksum(thisname, bp, st.st_size);
 885                 /*bp += sum_len;*/
 886         }
 887
 888         file->basedir = flist_dir;
 889
 890         if (!S_ISDIR(st.st_mode))
 891                 stats.total_size += st.st_size;
 892
 893         return file;
 894 }
 895
 896
 897 void send_file_name(int f, struct file_list *flist, char *fname,
 898                     int recursive, unsigned short base_flags)
 899 {
 900         struct file_struct *file;
 901         char fbuf[MAXPATHLEN];
 902         extern int delete_excluded;
 903
 904         /* f is set to -1 when calculating deletion file list */
 905         file = make_file(fname,
 906                          f == -1 && delete_excluded? SERVER_EXCLUDES
 907                                                    : ALL_EXCLUDES);
 908
 909         if (!file)
 910                 return;
 911
 912         maybe_emit_filelist_progress(flist);
 913
 914         flist_expand(flist);
 915
 916         if (write_batch)
 917                 file->flags |= FLAG_TOP_DIR;
 918
 919         if (file->basename[0]) {
 920                 flist->files[flist->count++] = file;
 921                 send_file_entry(file, f, base_flags);
 922         }
 923
 924         if (recursive && S_ISDIR(file->mode)
 925             && !(file->flags & FLAG_MOUNT_POINT)) {
 926                 struct exclude_struct **last_exclude_list = local_exclude_list;
 927                 send_directory(f, flist, f_name_to(file, fbuf));
 928                 local_exclude_list = last_exclude_list;
 929                 return;
 930         }
 931 }
 932
 933
 934 static void send_directory(int f, struct file_list *flist, char *dir)
 935 {
 936         DIR *d;
 937         struct dirent *di;
 938         char fname[MAXPATHLEN];
 939         unsigned int offset;
 940         char *p;
 941
 942         d = opendir(dir);
 943         if (!d) {
 944                 io_error |= IOERR_GENERAL;
 945                 rprintf(FERROR, "opendir %s failed: %s\n",
 946                         full_fname(dir), strerror(errno));
 947                 return;
 948         }
 949
 950         offset = strlcpy(fname, dir, MAXPATHLEN);
 951         p = fname + offset;
 952         if (offset >= MAXPATHLEN || p[-1] != '/') {
 953                 if (offset >= MAXPATHLEN - 1) {
 954                         io_error |= IOERR_GENERAL;
 955                         rprintf(FERROR, "skipping long-named directory: %s\n",
 956                                 full_fname(fname));
 957                         closedir(d);
 958                         return;
 959                 }
 960                 *p++ = '/';
 961                 offset++;
 962         }
 963
 964         local_exclude_list = NULL;
 965
 966         if (cvs_exclude) {
 967                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
 968                     < MAXPATHLEN - offset)
 969                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 970                 else {
 971                         io_error |= IOERR_GENERAL;
 972                         rprintf(FINFO,
 973                                 "cannot cvs-exclude in long-named directory %s\n",
 974                                 full_fname(fname));
 975                 }
 976         }
 977
 978         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 979                 char *dname = d_name(di);
 980                 if (dname[0] == '.' && (dname[1] == '\0'
 981                     || (dname[1] == '.' && dname[2] == '\0')))
 982                         continue;
 983                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
 984                         send_file_name(f, flist, fname, recurse, 0);
 985                 else {
 986                         io_error |= IOERR_GENERAL;
 987                         rprintf(FINFO,
 988                                 "cannot send long-named file %s\n",
 989                                 full_fname(fname));
 990                 }
 991         }
 992         if (errno) {
 993                 io_error |= IOERR_GENERAL;
 994                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 995                         dir, errno, strerror(errno));
 996         }
 997
 998         if (local_exclude_list)
 999                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
1000
1001         closedir(d);
1002 }
1003
1004
1005 /**
1006  * The delete_files() function in receiver.c sets f to -1 so that we just
1007  * construct the file list in memory without sending it over the wire.  It
1008  * also has the side-effect of ignoring user-excludes if delete_excluded
1009  * is set (so that the delete list includes user-excluded files).
1010  **/
1011 struct file_list *send_file_list(int f, int argc, char *argv[])
1012 {
1013         int l;
1014         STRUCT_STAT st;
1015         char *p, *dir, olddir[sizeof curr_dir];
1016         char lastpath[MAXPATHLEN] = "";
1017         struct file_list *flist;
1018         int64 start_write;
1019         int use_ff_fd = 0;
1020
1021         if (show_filelist_p() && f != -1)
1022                 start_filelist_progress("building file list");
1023
1024         start_write = stats.total_written;
1025
1026         flist = flist_new();
1027
1028         if (f != -1) {
1029                 io_start_buffering_out(f);
1030                 if (filesfrom_fd >= 0) {
1031                         if (argv[0] && !push_dir(argv[0])) {
1032                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1033                                         full_fname(argv[0]), strerror(errno));
1034                                 exit_cleanup(RERR_FILESELECT);
1035                         }
1036                         use_ff_fd = 1;
1037                 }
1038         }
1039
1040         while (1) {
1041                 char fname2[MAXPATHLEN];
1042                 char *fname = fname2;
1043
1044                 if (use_ff_fd) {
1045                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1046                                 break;
1047                         sanitize_path(fname, NULL);
1048                 } else {
1049                         if (argc-- == 0)
1050                                 break;
1051                         strlcpy(fname, *argv++, MAXPATHLEN);
1052                         if (sanitize_paths)
1053                                 sanitize_path(fname, NULL);
1054                 }
1055
1056                 l = strlen(fname);
1057                 if (fname[l - 1] == '/') {
1058                         if (l == 2 && fname[0] == '.') {
1059                                 /* Turn "./" into just "." rather than "./." */
1060                                 fname[1] = '\0';
1061                         } else if (l < MAXPATHLEN) {
1062                                 fname[l++] = '.';
1063                                 fname[l] = '\0';
1064                         }
1065                 }
1066
1067                 if (link_stat(fname, &st) != 0) {
1068                         if (f != -1) {
1069                                 io_error |= IOERR_GENERAL;
1070                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1071                                         full_fname(fname), strerror(errno));
1072                         }
1073                         continue;
1074                 }
1075
1076                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1077                         rprintf(FINFO, "skipping directory %s\n", fname);
1078                         continue;
1079                 }
1080
1081                 dir = NULL;
1082                 olddir[0] = '\0';
1083
1084                 if (!relative_paths) {
1085                         p = strrchr(fname, '/');
1086                         if (p) {
1087                                 *p = 0;
1088                                 if (p == fname)
1089                                         dir = "/";
1090                                 else
1091                                         dir = fname;
1092                                 fname = p + 1;
1093                         }
1094                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1095                         /* this ensures we send the intermediate directories,
1096                            thus getting their permissions right */
1097                         char *lp = lastpath, *fn = fname, *slash = fname;
1098                         *p = 0;
1099                         /* Skip any initial directories in our path that we
1100                          * have in common with lastpath. */
1101                         while (*fn && *lp == *fn) {
1102                                 if (*fn == '/')
1103                                         slash = fn;
1104                                 lp++, fn++;
1105                         }
1106                         *p = '/';
1107                         if (fn != p || (*lp && *lp != '/')) {
1108                                 int copy_links_saved = copy_links;
1109                                 int recurse_saved = recurse;
1110                                 copy_links = copy_unsafe_links;
1111                                 /* set recurse to 1 to prevent make_file
1112                                  * from ignoring directory, but still
1113                                  * turn off the recursive parameter to
1114                                  * send_file_name */
1115                                 recurse = 1;
1116                                 while ((slash = strchr(slash+1, '/')) != 0) {
1117                                         *slash = 0;
1118                                         send_file_name(f, flist, fname, 0, 0);
1119                                         *slash = '/';
1120                                 }
1121                                 copy_links = copy_links_saved;
1122                                 recurse = recurse_saved;
1123                                 *p = 0;
1124                                 strlcpy(lastpath, fname, sizeof lastpath);
1125                                 *p = '/';
1126                         }
1127                 }
1128
1129                 if (!*fname)
1130                         fname = ".";
1131
1132                 if (dir && *dir) {
1133                         static char *lastdir;
1134                         static int lastdir_len;
1135
1136                         strcpy(olddir, curr_dir); /* can't overflow */
1137
1138                         if (!push_dir(dir)) {
1139                                 io_error |= IOERR_GENERAL;
1140                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1141                                         full_fname(dir), strerror(errno));
1142                                 continue;
1143                         }
1144
1145                         if (lastdir && strcmp(lastdir, dir) == 0) {
1146                                 flist_dir = lastdir;
1147                                 flist_dir_len = lastdir_len;
1148                         } else {
1149                                 flist_dir = lastdir = strdup(dir);
1150                                 flist_dir_len = lastdir_len = strlen(dir);
1151                         }
1152                 }
1153
1154                 if (one_file_system)
1155                         set_filesystem(fname);
1156
1157                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1158
1159                 if (olddir[0]) {
1160                         flist_dir = NULL;
1161                         flist_dir_len = 0;
1162                         if (!pop_dir(olddir)) {
1163                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1164                                         full_fname(dir), strerror(errno));
1165                                 exit_cleanup(RERR_FILESELECT);
1166                         }
1167                 }
1168         }
1169
1170         if (f != -1) {
1171                 send_file_entry(NULL, f, 0);
1172
1173                 if (show_filelist_p())
1174                         finish_filelist_progress(flist);
1175         }
1176
1177         clean_flist(flist, 0, 0);
1178
1179         if (f != -1) {
1180                 /* Now send the uid/gid list. This was introduced in
1181                  * protocol version 15 */
1182                 send_uid_list(f);
1183
1184                 /* send the io_error flag */
1185                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1186
1187                 io_end_buffering();
1188                 stats.flist_size = stats.total_written - start_write;
1189                 stats.num_files = flist->count;
1190                 if (write_batch)
1191                         write_batch_flist_info(flist->count, flist->files);
1192         }
1193
1194         if (verbose > 3)
1195                 output_flist(flist);
1196
1197         if (verbose > 2)
1198                 rprintf(FINFO, "send_file_list done\n");
1199
1200         return flist;
1201 }
1202
1203
1204 struct file_list *recv_file_list(int f)
1205 {
1206         struct file_list *flist;
1207         unsigned short flags;
1208         int64 start_read;
1209         extern int list_only;
1210
1211         if (show_filelist_p())
1212                 start_filelist_progress("receiving file list");
1213
1214         start_read = stats.total_read;
1215
1216         flist = new(struct file_list);
1217         if (!flist)
1218                 goto oom;
1219
1220         flist->count = 0;
1221         flist->malloced = 1000;
1222         flist->files = new_array(struct file_struct *, flist->malloced);
1223         if (!flist->files)
1224                 goto oom;
1225
1226
1227         while ((flags = read_byte(f)) != 0) {
1228                 int i = flist->count;
1229
1230                 flist_expand(flist);
1231
1232                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1233                         flags |= read_byte(f) << 8;
1234                 receive_file_entry(&flist->files[i], flags, f);
1235
1236                 if (S_ISREG(flist->files[i]->mode))
1237                         stats.total_size += flist->files[i]->length;
1238
1239                 flist->count++;
1240
1241                 maybe_emit_filelist_progress(flist);
1242
1243                 if (verbose > 2) {
1244                         rprintf(FINFO, "recv_file_name(%s)\n",
1245                                 f_name(flist->files[i]));
1246                 }
1247         }
1248         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1249
1250         if (verbose > 2)
1251                 rprintf(FINFO, "received %d names\n", flist->count);
1252
1253         if (show_filelist_p())
1254                 finish_filelist_progress(flist);
1255
1256         clean_flist(flist, relative_paths, 1);
1257
1258         if (f != -1) {
1259                 /* Now send the uid/gid list. This was introduced in
1260                  * protocol version 15 */
1261                 recv_uid_list(f, flist);
1262
1263                 if (!read_batch) {
1264                         /* Recv the io_error flag */
1265                         if (lp_ignore_errors(module_id) || ignore_errors)
1266                                 read_int(f);
1267                         else
1268                                 io_error |= read_int(f);
1269                 }
1270         }
1271
1272         if (verbose > 3)
1273                 output_flist(flist);
1274
1275         if (list_only) {
1276                 int i;
1277                 for (i = 0; i < flist->count; i++)
1278                         list_file_entry(flist->files[i]);
1279         }
1280
1281         if (verbose > 2)
1282                 rprintf(FINFO, "recv_file_list done\n");
1283
1284         stats.flist_size = stats.total_read - start_read;
1285         stats.num_files = flist->count;
1286
1287         return flist;
1288
1289       oom:
1290         out_of_memory("recv_file_list");
1291         return NULL;            /* not reached */
1292 }
1293
1294
1295 int file_compare(struct file_struct **file1, struct file_struct **file2)
1296 {
1297         struct file_struct *f1 = *file1;
1298         struct file_struct *f2 = *file2;
1299
1300         if (!f1->basename && !f2->basename)
1301                 return 0;
1302         if (!f1->basename)
1303                 return -1;
1304         if (!f2->basename)
1305                 return 1;
1306         if (f1->dirname == f2->dirname)
1307                 return u_strcmp(f1->basename, f2->basename);
1308         return f_name_cmp(f1, f2);
1309 }
1310
1311
1312 int flist_find(struct file_list *flist, struct file_struct *f)
1313 {
1314         int low = 0, high = flist->count - 1;
1315
1316         while (high >= 0 && !flist->files[high]->basename) high--;
1317
1318         if (high < 0)
1319                 return -1;
1320
1321         while (low != high) {
1322                 int mid = (low + high) / 2;
1323                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1324                 if (ret == 0)
1325                         return flist_up(flist, mid);
1326                 if (ret > 0)
1327                         high = mid;
1328                 else
1329                         low = mid + 1;
1330         }
1331
1332         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1333                 return flist_up(flist, low);
1334         return -1;
1335 }
1336
1337
1338 /*
1339  * Free up any resources a file_struct has allocated, and optionally free
1340  * it up as well.
1341  */
1342 void free_file(struct file_struct *file, int free_the_struct)
1343 {
1344         if (free_the_struct)
1345                 free(file);
1346         else
1347                 memset(file, 0, min_file_struct_len);
1348 }
1349
1350
1351 /*
1352  * allocate a new file list
1353  */
1354 struct file_list *flist_new(void)
1355 {
1356         struct file_list *flist;
1357
1358         flist = new(struct file_list);
1359         if (!flist)
1360                 out_of_memory("send_file_list");
1361
1362         flist->count = 0;
1363         flist->malloced = 0;
1364         flist->files = NULL;
1365
1366         return flist;
1367 }
1368
1369 /*
1370  * free up all elements in a flist
1371  */
1372 void flist_free(struct file_list *flist)
1373 {
1374         int i;
1375         for (i = 1; i < flist->count; i++)
1376                 free_file(flist->files[i], FREE_STRUCT);
1377         free(flist->files);
1378         free(flist);
1379 }
1380
1381
1382 /*
1383  * This routine ensures we don't have any duplicate names in our file list.
1384  * duplicate names can cause corruption because of the pipelining
1385  */
1386 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1387 {
1388         int i, prev_i = 0;
1389
1390         if (!flist || flist->count == 0)
1391                 return;
1392
1393         qsort(flist->files, flist->count,
1394               sizeof flist->files[0], (int (*)()) file_compare);
1395
1396         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1397                 if (flist->files[i]->basename) {
1398                         prev_i = i;
1399                         break;
1400                 }
1401         }
1402         while (++i < flist->count) {
1403                 if (!flist->files[i]->basename)
1404                         continue;
1405                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1406                         if (verbose > 1 && !am_server) {
1407                                 rprintf(FINFO,
1408                                         "removing duplicate name %s from file list %d\n",
1409                                         f_name(flist->files[i]), i);
1410                         }
1411                         /* Make sure that if we unduplicate '.', that we don't
1412                          * lose track of a user-specified starting point (or
1413                          * else deletions will mysteriously fail with -R). */
1414                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1415                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1416                         free_file(flist->files[i], CLEAR_STRUCT);
1417                 } else
1418                         prev_i = i;
1419         }
1420
1421         if (strip_root) {
1422                 /* we need to strip off the root directory in the case
1423                    of relative paths, but this must be done _after_
1424                    the sorting phase */
1425                 for (i = 0; i < flist->count; i++) {
1426                         if (flist->files[i]->dirname &&
1427                             flist->files[i]->dirname[0] == '/') {
1428                                 memmove(&flist->files[i]->dirname[0],
1429                                         &flist->files[i]->dirname[1],
1430                                         strlen(flist->files[i]->dirname));
1431                         }
1432
1433                         if (flist->files[i]->dirname &&
1434                             !flist->files[i]->dirname[0]) {
1435                                 flist->files[i]->dirname = NULL;
1436                         }
1437                 }
1438         }
1439 }
1440
1441 static void output_flist(struct file_list *flist)
1442 {
1443         char uidbuf[16], gidbuf[16];
1444         struct file_struct *file;
1445         int i;
1446
1447         for (i = 0; i < flist->count; i++) {
1448                 file = flist->files[i];
1449                 if (am_root && preserve_uid)
1450                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1451                 else
1452                         *uidbuf = '\0';
1453                 if (preserve_gid && file->gid != GID_NONE)
1454                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1455                 else
1456                         *gidbuf = '\0';
1457                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1458                         who_am_i(), i, NS(file->basedir), NS(file->dirname),
1459                         NS(file->basename), (int) file->mode,
1460                         (double) file->length, uidbuf, gidbuf);
1461         }
1462 }
1463
1464
1465 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1466
1467 /* Compare the names of two file_struct entities, just like strcmp()
1468  * would do if it were operating on the joined strings.  We assume
1469  * that there are no 0-length strings.
1470  */
1471 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1472 {
1473         int dif;
1474         const uchar *c1, *c2;
1475         enum fnc_state state1, state2;
1476
1477         if (!f1 || !f1->basename) {
1478                 if (!f2 || !f2->basename)
1479                         return 0;
1480                 return -1;
1481         }
1482         if (!f2 || !f2->basename)
1483                 return 1;
1484
1485         if (!(c1 = (uchar*)f1->dirname)) {
1486                 state1 = fnc_BASE;
1487                 c1 = (uchar*)f1->basename;
1488         } else
1489                 state1 = fnc_DIR;
1490         if (!(c2 = (uchar*)f2->dirname)) {
1491                 state2 = fnc_BASE;
1492                 c2 = (uchar*)f2->basename;
1493         } else
1494                 state2 = fnc_DIR;
1495
1496         while (1) {
1497                 if ((dif = (int)*c1 - (int)*c2) != 0)
1498                         break;
1499                 if (!*++c1) {
1500                         switch (state1) {
1501                         case fnc_DIR:
1502                                 state1 = fnc_SLASH;
1503                                 c1 = (uchar*)"/";
1504                                 break;
1505                         case fnc_SLASH:
1506                                 state1 = fnc_BASE;
1507                                 c1 = (uchar*)f1->basename;
1508                                 break;
1509                         case fnc_BASE:
1510                                 break;
1511                         }
1512                 }
1513                 if (!*++c2) {
1514                         switch (state2) {
1515                         case fnc_DIR:
1516                                 state2 = fnc_SLASH;
1517                                 c2 = (uchar*)"/";
1518                                 break;
1519                         case fnc_SLASH:
1520                                 state2 = fnc_BASE;
1521                                 c2 = (uchar*)f2->basename;
1522                                 break;
1523                         case fnc_BASE:
1524                                 if (!*c1)
1525                                         return 0;
1526                                 break;
1527                         }
1528                 }
1529         }
1530
1531         return dif;
1532 }
1533
1534
1535 /* Return a copy of the full filename of a flist entry, using the indicated
1536  * buffer.  No size-checking is done because we checked the size when creating
1537  * the file_struct entry.
1538  */
1539 char *f_name_to(struct file_struct *f, char *fbuf)
1540 {
1541         if (!f || !f->basename)
1542                 return NULL;
1543
1544         if (f->dirname) {
1545                 int len = strlen(f->dirname);
1546                 memcpy(fbuf, f->dirname, len);
1547                 fbuf[len] = '/';
1548                 strcpy(fbuf + len + 1, f->basename);
1549         } else
1550                 strcpy(fbuf, f->basename);
1551         return fbuf;
1552 }
1553
1554
1555 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1556  */
1557 char *f_name(struct file_struct *f)
1558 {
1559         static char names[5][MAXPATHLEN];
1560         static unsigned int n;
1561
1562         n = (n + 1) % (sizeof names / sizeof names[0]);
1563
1564         return f_name_to(f, names[n]);
1565 }