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                 if (!numeric_ids)
 439                         add_uid(uid);
 440                 write_int(f, uid);
 441         }
 442         if (preserve_gid && !(flags & XMIT_SAME_GID)) {
 443                 if (!numeric_ids)
 444                         add_gid(gid);
 445                 write_int(f, gid);
 446         }
 447         if (preserve_devices && IS_DEVICE(mode)) {
 448                 /* If XMIT_SAME_HIGH_RDEV is off, XMIT_SAME_RDEV_pre28 is
 449                  * also off. */
 450                 if (!(flags & XMIT_SAME_HIGH_RDEV))
 451                         write_int(f, rdev);
 452                 else if (protocol_version >= 28)
 453                         write_byte(f, rdev);
 454         }
 455
 456 #if SUPPORT_LINKS
 457         if (preserve_links && S_ISLNK(mode)) {
 458                 int len = strlen(file->u.link);
 459                 write_int(f, len);
 460                 write_buf(f, file->u.link, len);
 461         }
 462 #endif
 463
 464 #if SUPPORT_HARD_LINKS
 465         if (flags & XMIT_HAS_IDEV_DATA) {
 466                 if (protocol_version < 26) {
 467                         /* 32-bit dev_t and ino_t */
 468                         write_int(f, dev);
 469                         write_int(f, file->F_INODE);
 470                 } else {
 471                         /* 64-bit dev_t and ino_t */
 472                         if (!(flags & XMIT_SAME_DEV))
 473                                 write_longint(f, dev);
 474                         write_longint(f, file->F_INODE);
 475                 }
 476         }
 477 #endif
 478
 479         if (always_checksum) {
 480                 char *sum;
 481                 if (S_ISREG(mode))
 482                         sum = file->u.sum;
 483                 else if (protocol_version < 28) {
 484                         /* Prior to 28, we sent a useless set of nulls. */
 485                         sum = empty_sum;
 486                 } else
 487                         sum = NULL;
 488                 if (sum) {
 489                         write_buf(f, sum, protocol_version < 21? 2
 490                                                         : MD4_SUM_LENGTH);
 491                 }
 492         }
 493
 494         strlcpy(lastname, fname, MAXPATHLEN);
 495
 496         io_write_phase = "unknown";
 497 }
 498
 499
 500
 501 void receive_file_entry(struct file_struct **fptr, unsigned short flags, int f)
 502 {
 503         static time_t modtime;
 504         static mode_t mode;
 505         static DEV64_T rdev, rdev_high;
 506         static DEV64_T dev;
 507         static uid_t uid;
 508         static gid_t gid;
 509         static char lastname[MAXPATHLEN], *lastdir;
 510         static int lastdir_len = -1;
 511         char thisname[MAXPATHLEN];
 512         unsigned int l1 = 0, l2 = 0;
 513         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 514         int file_struct_len, idev_len;
 515         OFF_T file_length;
 516         char *basename, *dirname, *bp;
 517         struct file_struct *file;
 518
 519         if (!fptr) {
 520                 modtime = 0, mode = 0;
 521                 rdev = 0, rdev_high = 0, dev = 0;
 522                 uid = 0, gid = 0;
 523                 *lastname = '\0';
 524                 return;
 525         }
 526
 527         if (flags & XMIT_SAME_NAME)
 528                 l1 = read_byte(f);
 529
 530         if (flags & XMIT_LONG_NAME)
 531                 l2 = read_int(f);
 532         else
 533                 l2 = read_byte(f);
 534
 535         if (l2 >= MAXPATHLEN - l1) {
 536                 rprintf(FERROR,
 537                         "overflow: flags=0x%x l1=%d l2=%d lastname=%s\n",
 538                         flags, l1, l2, lastname);
 539                 overflow("receive_file_entry");
 540         }
 541
 542         strlcpy(thisname, lastname, l1 + 1);
 543         read_sbuf(f, &thisname[l1], l2);
 544         thisname[l1 + l2] = 0;
 545
 546         strlcpy(lastname, thisname, MAXPATHLEN);
 547
 548         clean_fname(thisname);
 549
 550         if (sanitize_paths)
 551                 sanitize_path(thisname, NULL);
 552
 553         if ((basename = strrchr(thisname, '/')) != NULL) {
 554                 dirname_len = ++basename - thisname; /* counts future '\0' */
 555                 if (lastdir_len == dirname_len - 1
 556                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 557                         dirname = lastdir;
 558                         dirname_len = 0; /* indicates no copy is needed */
 559                 } else
 560                         dirname = thisname;
 561         } else {
 562                 basename = thisname;
 563                 dirname = NULL;
 564                 dirname_len = 0;
 565         }
 566         basename_len = strlen(basename) + 1; /* count the '\0' */
 567
 568         file_length = read_longint(f);
 569         if (!(flags & XMIT_SAME_TIME))
 570                 modtime = (time_t)read_int(f);
 571         if (!(flags & XMIT_SAME_MODE))
 572                 mode = from_wire_mode(read_int(f));
 573
 574         if (preserve_uid && !(flags & XMIT_SAME_UID))
 575                 uid = (uid_t)read_int(f);
 576         if (preserve_gid && !(flags & XMIT_SAME_GID))
 577                 gid = (gid_t)read_int(f);
 578
 579         if (preserve_devices) {
 580                 if (protocol_version < 28) {
 581                         if (IS_DEVICE(mode)) {
 582                                 if (!(flags & XMIT_SAME_RDEV_pre28))
 583                                         rdev = (DEV64_T)read_int(f);
 584                         } else
 585                                 rdev = 0;
 586                 } else if (IS_DEVICE(mode)) {
 587                         if (!(flags & XMIT_SAME_HIGH_RDEV)) {
 588                                 rdev = (DEV64_T)read_int(f);
 589                                 rdev_high = rdev & ~0xFF;
 590                         } else
 591                                 rdev = rdev_high | (DEV64_T)read_byte(f);
 592                 }
 593         }
 594
 595 #if SUPPORT_LINKS
 596         if (preserve_links && S_ISLNK(mode)) {
 597                 linkname_len = read_int(f) + 1; /* count the '\0' */
 598                 if (linkname_len <= 0 || linkname_len > MAXPATHLEN) {
 599                         rprintf(FERROR, "overflow: linkname_len=%d\n",
 600                                 linkname_len - 1);
 601                         overflow("receive_file_entry");
 602                 }
 603         }
 604         else
 605 #endif
 606                 linkname_len = 0;
 607
 608 #if SUPPORT_HARD_LINKS
 609         if (preserve_hard_links && protocol_version < 28 && S_ISREG(mode))
 610                 flags |= XMIT_HAS_IDEV_DATA;
 611         if (flags & XMIT_HAS_IDEV_DATA)
 612                 idev_len = sizeof (struct idev);
 613         else
 614 #endif
 615                 idev_len = 0;
 616
 617         sum_len = always_checksum && S_ISREG(mode) ? MD4_SUM_LENGTH : 0;
 618         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
 619
 620         alloc_len = file_struct_len + dirname_len + basename_len
 621                   + linkname_len + sum_len + idev_len;
 622         if (!(bp = new_array(char, alloc_len)))
 623                 out_of_memory("receive_file_entry");
 624         file = *fptr = (struct file_struct *)bp;
 625         memset(bp, 0, min_file_struct_len);
 626         bp += file_struct_len;
 627
 628         file->flags = flags & XMIT_TOP_DIR ? FLAG_TOP_DIR : 0;
 629         file->modtime = modtime;
 630         file->length = file_length;
 631         file->mode = mode;
 632         file->uid = uid;
 633         file->gid = gid;
 634
 635 #if SUPPORT_HARD_LINKS
 636         if (idev_len) {
 637                 file->link_u.idev = (struct idev *)bp;
 638                 bp += idev_len;
 639         }
 640 #endif
 641
 642         if (dirname_len) {
 643                 file->dirname = lastdir = bp;
 644                 lastdir_len = dirname_len - 1;
 645                 memcpy(bp, dirname, dirname_len - 1);
 646                 bp += dirname_len;
 647                 bp[-1] = '\0';
 648         } else if (dirname)
 649                 file->dirname = dirname;
 650
 651         file->basename = bp;
 652         memcpy(bp, basename, basename_len);
 653         bp += basename_len;
 654
 655         if (preserve_devices && IS_DEVICE(mode))
 656                 file->u.rdev = rdev;
 657
 658 #if SUPPORT_LINKS
 659         if (linkname_len) {
 660                 file->u.link = bp;
 661                 read_sbuf(f, bp, linkname_len - 1);
 662                 if (sanitize_paths)
 663                         sanitize_path(bp, lastdir);
 664                 bp += linkname_len;
 665         }
 666 #endif
 667
 668 #if SUPPORT_HARD_LINKS
 669         if (idev_len) {
 670                 if (protocol_version < 26) {
 671                         dev = read_int(f);
 672                         file->F_INODE = read_int(f);
 673                 } else {
 674                         if (!(flags & XMIT_SAME_DEV))
 675                                 dev = read_longint(f);
 676                         file->F_INODE = read_longint(f);
 677                 }
 678                 file->F_DEV = dev;
 679         }
 680 #endif
 681
 682         if (always_checksum) {
 683                 char *sum;
 684                 if (sum_len) {
 685                         file->u.sum = sum = bp;
 686                         /*bp += sum_len;*/
 687                 } else if (protocol_version < 28) {
 688                         /* Prior to 28, we get a useless set of nulls. */
 689                         sum = empty_sum;
 690                 } else
 691                         sum = NULL;
 692                 if (sum) {
 693                         read_buf(f, sum, protocol_version < 21? 2
 694                                                 : MD4_SUM_LENGTH);
 695                 }
 696         }
 697
 698         if (!preserve_perms) {
 699                 extern int orig_umask;
 700                 /* set an appropriate set of permissions based on original
 701                  * permissions and umask. This emulates what GNU cp does */
 702                 file->mode &= ~orig_umask;
 703         }
 704 }
 705
 706
 707 /**
 708  * Create a file_struct for a named file by reading its stat()
 709  * information and performing extensive checks against global
 710  * options.
 711  *
 712  * @return the new file, or NULL if there was an error or this file
 713  * should be excluded.
 714  *
 715  * @todo There is a small optimization opportunity here to avoid
 716  * stat()ing the file in some circumstances, which has a certain cost.
 717  * We are called immediately after doing readdir(), and so we may
 718  * already know the d_type of the file.  We could for example avoid
 719  * statting directories if we're not recursing, but this is not a very
 720  * important case.  Some systems may not have d_type.
 721  **/
 722 struct file_struct *make_file(char *fname, int exclude_level)
 723 {
 724         static char *lastdir;
 725         static int lastdir_len = -1;
 726         struct file_struct *file;
 727         STRUCT_STAT st;
 728         char sum[SUM_LENGTH];
 729         char thisname[MAXPATHLEN];
 730         char linkname[MAXPATHLEN];
 731         int alloc_len, basename_len, dirname_len, linkname_len, sum_len;
 732         int file_struct_len, idev_len;
 733         char *basename, *dirname, *bp;
 734         unsigned short flags = 0;
 735
 736         if (strlcpy(thisname, fname, sizeof thisname)
 737             >= sizeof thisname - flist_dir_len) {
 738                 rprintf(FINFO, "skipping overly long name: %s\n", fname);
 739                 return NULL;
 740         }
 741         clean_fname(thisname);
 742         if (sanitize_paths)
 743                 sanitize_path(thisname, NULL);
 744
 745         memset(sum, 0, SUM_LENGTH);
 746
 747         if (readlink_stat(thisname, &st, linkname) != 0) {
 748                 int save_errno = errno;
 749                 if (errno == ENOENT && exclude_level != NO_EXCLUDES) {
 750                         /* either symlink pointing nowhere or file that
 751                          * was removed during rsync run; see if excluded
 752                          * before reporting an error */
 753                         if (check_exclude_file(thisname, 0, exclude_level)) {
 754                                 /* file is excluded anyway, ignore silently */
 755                                 return NULL;
 756                         }
 757                 }
 758                 io_error |= IOERR_GENERAL;
 759                 rprintf(FERROR, "readlink %s failed: %s\n",
 760                         full_fname(thisname), strerror(save_errno));
 761                 return NULL;
 762         }
 763
 764         /* backup.c calls us with exclude_level set to NO_EXCLUDES. */
 765         if (exclude_level == NO_EXCLUDES)
 766                 goto skip_excludes;
 767
 768         if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
 769                 rprintf(FINFO, "skipping directory %s\n", thisname);
 770                 return NULL;
 771         }
 772
 773         /* We only care about directories because we need to avoid recursing
 774          * into a mount-point directory, not to avoid copying a symlinked
 775          * file if -L (or similar) was specified. */
 776         if (one_file_system && st.st_dev != filesystem_dev
 777             && S_ISDIR(st.st_mode))
 778                 flags |= FLAG_MOUNT_POINT;
 779
 780         if (check_exclude_file(thisname, S_ISDIR(st.st_mode) != 0, exclude_level))
 781                 return NULL;
 782
 783         if (lp_ignore_nonreadable(module_id) && access(thisname, R_OK) != 0)
 784                 return NULL;
 785
 786       skip_excludes:
 787
 788         if (verbose > 2) {
 789                 rprintf(FINFO, "[%s] make_file(%s,*,%d)\n",
 790                         who_am_i(), thisname, exclude_level);
 791         }
 792
 793         if ((basename = strrchr(thisname, '/')) != NULL) {
 794                 dirname_len = ++basename - thisname; /* counts future '\0' */
 795                 if (lastdir_len == dirname_len - 1
 796                     && strncmp(thisname, lastdir, lastdir_len) == 0) {
 797                         dirname = lastdir;
 798                         dirname_len = 0; /* indicates no copy is needed */
 799                 } else
 800                         dirname = thisname;
 801         } else {
 802                 basename = thisname;
 803                 dirname = NULL;
 804                 dirname_len = 0;
 805         }
 806         basename_len = strlen(basename) + 1; /* count the '\0' */
 807
 808 #if SUPPORT_LINKS
 809         linkname_len = S_ISLNK(st.st_mode) ? strlen(linkname) + 1 : 0;
 810 #else
 811         linkname_len = 0;
 812 #endif
 813
 814 #if SUPPORT_HARD_LINKS
 815         if (preserve_hard_links) {
 816                 if (protocol_version < 28) {
 817                         if (S_ISREG(st.st_mode))
 818                                 idev_len = sizeof (struct idev);
 819                         else
 820                                 idev_len = 0;
 821                 } else {
 822                         if (!S_ISDIR(st.st_mode) && st.st_nlink > 1)
 823                                 idev_len = sizeof (struct idev);
 824                         else
 825                                 idev_len = 0;
 826                 }
 827         } else
 828 #endif
 829                 idev_len = 0;
 830
 831         sum_len = always_checksum && S_ISREG(st.st_mode) ? MD4_SUM_LENGTH : 0;
 832         file_struct_len = idev_len? sizeof file[0] : min_file_struct_len;
 833
 834         alloc_len = file_struct_len + dirname_len + basename_len
 835                   + linkname_len + sum_len + idev_len;
 836         if (!(bp = new_array(char, alloc_len)))
 837                 out_of_memory("receive_file_entry");
 838         file = (struct file_struct *)bp;
 839         memset(bp, 0, min_file_struct_len);
 840         bp += file_struct_len;
 841
 842         file->flags = flags;
 843         file->modtime = st.st_mtime;
 844         file->length = st.st_size;
 845         file->mode = st.st_mode;
 846         file->uid = st.st_uid;
 847         file->gid = st.st_gid;
 848
 849 #if SUPPORT_HARD_LINKS
 850         if (idev_len) {
 851                 file->link_u.idev = (struct idev *)bp;
 852                 bp += idev_len;
 853                 file->F_DEV = st.st_dev;
 854                 file->F_INODE = st.st_ino;
 855         }
 856 #endif
 857
 858         if (dirname_len) {
 859                 file->dirname = lastdir = bp;
 860                 lastdir_len = dirname_len - 1;
 861                 memcpy(bp, dirname, dirname_len - 1);
 862                 bp += dirname_len;
 863                 bp[-1] = '\0';
 864         } else if (dirname)
 865                 file->dirname = dirname;
 866
 867         file->basename = bp;
 868         memcpy(bp, basename, basename_len);
 869         bp += basename_len;
 870
 871 #ifdef HAVE_STRUCT_STAT_ST_RDEV
 872         if (preserve_devices && IS_DEVICE(st.st_mode))
 873                 file->u.rdev = st.st_rdev;
 874 #endif
 875
 876 #if SUPPORT_LINKS
 877         if (linkname_len) {
 878                 file->u.link = bp;
 879                 memcpy(bp, linkname, linkname_len);
 880                 bp += linkname_len;
 881         }
 882 #endif
 883
 884         if (sum_len) {
 885                 file->u.sum = bp;
 886                 file_checksum(thisname, bp, st.st_size);
 887                 /*bp += sum_len;*/
 888         }
 889
 890         file->basedir = flist_dir;
 891
 892         if (!S_ISDIR(st.st_mode))
 893                 stats.total_size += st.st_size;
 894
 895         return file;
 896 }
 897
 898
 899 void send_file_name(int f, struct file_list *flist, char *fname,
 900                     int recursive, unsigned short base_flags)
 901 {
 902         struct file_struct *file;
 903         char fbuf[MAXPATHLEN];
 904         extern int delete_excluded;
 905
 906         /* f is set to -1 when calculating deletion file list */
 907         file = make_file(fname,
 908                          f == -1 && delete_excluded? SERVER_EXCLUDES
 909                                                    : ALL_EXCLUDES);
 910
 911         if (!file)
 912                 return;
 913
 914         maybe_emit_filelist_progress(flist);
 915
 916         flist_expand(flist);
 917
 918         if (write_batch)
 919                 file->flags |= FLAG_TOP_DIR;
 920
 921         if (file->basename[0]) {
 922                 flist->files[flist->count++] = file;
 923                 send_file_entry(file, f, base_flags);
 924         }
 925
 926         if (recursive && S_ISDIR(file->mode)
 927             && !(file->flags & FLAG_MOUNT_POINT)) {
 928                 struct exclude_struct **last_exclude_list = local_exclude_list;
 929                 send_directory(f, flist, f_name_to(file, fbuf));
 930                 local_exclude_list = last_exclude_list;
 931                 return;
 932         }
 933 }
 934
 935
 936 static void send_directory(int f, struct file_list *flist, char *dir)
 937 {
 938         DIR *d;
 939         struct dirent *di;
 940         char fname[MAXPATHLEN];
 941         unsigned int offset;
 942         char *p;
 943
 944         d = opendir(dir);
 945         if (!d) {
 946                 io_error |= IOERR_GENERAL;
 947                 rprintf(FERROR, "opendir %s failed: %s\n",
 948                         full_fname(dir), strerror(errno));
 949                 return;
 950         }
 951
 952         offset = strlcpy(fname, dir, MAXPATHLEN);
 953         p = fname + offset;
 954         if (offset >= MAXPATHLEN || p[-1] != '/') {
 955                 if (offset >= MAXPATHLEN - 1) {
 956                         io_error |= IOERR_GENERAL;
 957                         rprintf(FERROR, "skipping long-named directory: %s\n",
 958                                 full_fname(fname));
 959                         closedir(d);
 960                         return;
 961                 }
 962                 *p++ = '/';
 963                 offset++;
 964         }
 965
 966         local_exclude_list = NULL;
 967
 968         if (cvs_exclude) {
 969                 if (strlcpy(p, ".cvsignore", MAXPATHLEN - offset)
 970                     < MAXPATHLEN - offset)
 971                         add_exclude_file(&local_exclude_list,fname,MISSING_OK,ADD_EXCLUDE);
 972                 else {
 973                         io_error |= IOERR_GENERAL;
 974                         rprintf(FINFO,
 975                                 "cannot cvs-exclude in long-named directory %s\n",
 976                                 full_fname(fname));
 977                 }
 978         }
 979
 980         for (errno = 0, di = readdir(d); di; errno = 0, di = readdir(d)) {
 981                 char *dname = d_name(di);
 982                 if (dname[0] == '.' && (dname[1] == '\0'
 983                     || (dname[1] == '.' && dname[2] == '\0')))
 984                         continue;
 985                 if (strlcpy(p, dname, MAXPATHLEN - offset) < MAXPATHLEN - offset)
 986                         send_file_name(f, flist, fname, recurse, 0);
 987                 else {
 988                         io_error |= IOERR_GENERAL;
 989                         rprintf(FINFO,
 990                                 "cannot send long-named file %s\n",
 991                                 full_fname(fname));
 992                 }
 993         }
 994         if (errno) {
 995                 io_error |= IOERR_GENERAL;
 996                 rprintf(FERROR, "readdir(%s): (%d) %s\n",
 997                         dir, errno, strerror(errno));
 998         }
 999
1000         if (local_exclude_list)
1001                 free_exclude_list(&local_exclude_list); /* Zeros pointer too */
1002
1003         closedir(d);
1004 }
1005
1006
1007 /**
1008  * The delete_files() function in receiver.c sets f to -1 so that we just
1009  * construct the file list in memory without sending it over the wire.  It
1010  * also has the side-effect of ignoring user-excludes if delete_excluded
1011  * is set (so that the delete list includes user-excluded files).
1012  **/
1013 struct file_list *send_file_list(int f, int argc, char *argv[])
1014 {
1015         int l;
1016         STRUCT_STAT st;
1017         char *p, *dir, olddir[sizeof curr_dir];
1018         char lastpath[MAXPATHLEN] = "";
1019         struct file_list *flist;
1020         int64 start_write;
1021         int use_ff_fd = 0;
1022
1023         if (show_filelist_p() && f != -1)
1024                 start_filelist_progress("building file list");
1025
1026         start_write = stats.total_written;
1027
1028         flist = flist_new();
1029
1030         if (f != -1) {
1031                 io_start_buffering_out(f);
1032                 if (filesfrom_fd >= 0) {
1033                         if (argv[0] && !push_dir(argv[0])) {
1034                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1035                                         full_fname(argv[0]), strerror(errno));
1036                                 exit_cleanup(RERR_FILESELECT);
1037                         }
1038                         use_ff_fd = 1;
1039                 }
1040         }
1041
1042         while (1) {
1043                 char fname2[MAXPATHLEN];
1044                 char *fname = fname2;
1045
1046                 if (use_ff_fd) {
1047                         if (read_filesfrom_line(filesfrom_fd, fname) == 0)
1048                                 break;
1049                         sanitize_path(fname, NULL);
1050                 } else {
1051                         if (argc-- == 0)
1052                                 break;
1053                         strlcpy(fname, *argv++, MAXPATHLEN);
1054                         if (sanitize_paths)
1055                                 sanitize_path(fname, NULL);
1056                 }
1057
1058                 l = strlen(fname);
1059                 if (fname[l - 1] == '/') {
1060                         if (l == 2 && fname[0] == '.') {
1061                                 /* Turn "./" into just "." rather than "./." */
1062                                 fname[1] = '\0';
1063                         } else if (l < MAXPATHLEN) {
1064                                 fname[l++] = '.';
1065                                 fname[l] = '\0';
1066                         }
1067                 }
1068
1069                 if (link_stat(fname, &st) != 0) {
1070                         if (f != -1) {
1071                                 io_error |= IOERR_GENERAL;
1072                                 rprintf(FERROR, "link_stat %s failed: %s\n",
1073                                         full_fname(fname), strerror(errno));
1074                         }
1075                         continue;
1076                 }
1077
1078                 if (S_ISDIR(st.st_mode) && !recurse && !files_from) {
1079                         rprintf(FINFO, "skipping directory %s\n", fname);
1080                         continue;
1081                 }
1082
1083                 dir = NULL;
1084                 olddir[0] = '\0';
1085
1086                 if (!relative_paths) {
1087                         p = strrchr(fname, '/');
1088                         if (p) {
1089                                 *p = 0;
1090                                 if (p == fname)
1091                                         dir = "/";
1092                                 else
1093                                         dir = fname;
1094                                 fname = p + 1;
1095                         }
1096                 } else if (f != -1 && implied_dirs && (p=strrchr(fname,'/')) && p != fname) {
1097                         /* this ensures we send the intermediate directories,
1098                            thus getting their permissions right */
1099                         char *lp = lastpath, *fn = fname, *slash = fname;
1100                         *p = 0;
1101                         /* Skip any initial directories in our path that we
1102                          * have in common with lastpath. */
1103                         while (*fn && *lp == *fn) {
1104                                 if (*fn == '/')
1105                                         slash = fn;
1106                                 lp++, fn++;
1107                         }
1108                         *p = '/';
1109                         if (fn != p || (*lp && *lp != '/')) {
1110                                 int copy_links_saved = copy_links;
1111                                 int recurse_saved = recurse;
1112                                 copy_links = copy_unsafe_links;
1113                                 /* set recurse to 1 to prevent make_file
1114                                  * from ignoring directory, but still
1115                                  * turn off the recursive parameter to
1116                                  * send_file_name */
1117                                 recurse = 1;
1118                                 while ((slash = strchr(slash+1, '/')) != 0) {
1119                                         *slash = 0;
1120                                         send_file_name(f, flist, fname, 0, 0);
1121                                         *slash = '/';
1122                                 }
1123                                 copy_links = copy_links_saved;
1124                                 recurse = recurse_saved;
1125                                 *p = 0;
1126                                 strlcpy(lastpath, fname, sizeof lastpath);
1127                                 *p = '/';
1128                         }
1129                 }
1130
1131                 if (!*fname)
1132                         fname = ".";
1133
1134                 if (dir && *dir) {
1135                         static char *lastdir;
1136                         static int lastdir_len;
1137
1138                         strcpy(olddir, curr_dir); /* can't overflow */
1139
1140                         if (!push_dir(dir)) {
1141                                 io_error |= IOERR_GENERAL;
1142                                 rprintf(FERROR, "push_dir %s failed: %s\n",
1143                                         full_fname(dir), strerror(errno));
1144                                 continue;
1145                         }
1146
1147                         if (lastdir && strcmp(lastdir, dir) == 0) {
1148                                 flist_dir = lastdir;
1149                                 flist_dir_len = lastdir_len;
1150                         } else {
1151                                 flist_dir = lastdir = strdup(dir);
1152                                 flist_dir_len = lastdir_len = strlen(dir);
1153                         }
1154                 }
1155
1156                 if (one_file_system)
1157                         set_filesystem(fname);
1158
1159                 send_file_name(f, flist, fname, recurse, XMIT_TOP_DIR);
1160
1161                 if (olddir[0]) {
1162                         flist_dir = NULL;
1163                         flist_dir_len = 0;
1164                         if (!pop_dir(olddir)) {
1165                                 rprintf(FERROR, "pop_dir %s failed: %s\n",
1166                                         full_fname(dir), strerror(errno));
1167                                 exit_cleanup(RERR_FILESELECT);
1168                         }
1169                 }
1170         }
1171
1172         if (f != -1) {
1173                 send_file_entry(NULL, f, 0);
1174
1175                 if (show_filelist_p())
1176                         finish_filelist_progress(flist);
1177         }
1178
1179         clean_flist(flist, 0, 0);
1180
1181         if (f != -1) {
1182                 /* Now send the uid/gid list. This was introduced in
1183                  * protocol version 15 */
1184                 send_uid_list(f);
1185
1186                 /* send the io_error flag */
1187                 write_int(f, lp_ignore_errors(module_id) ? 0 : io_error);
1188
1189                 io_end_buffering();
1190                 stats.flist_size = stats.total_written - start_write;
1191                 stats.num_files = flist->count;
1192                 if (write_batch)
1193                         write_batch_flist_info(flist->count, flist->files);
1194         }
1195
1196         if (verbose > 3)
1197                 output_flist(flist);
1198
1199         if (verbose > 2)
1200                 rprintf(FINFO, "send_file_list done\n");
1201
1202         return flist;
1203 }
1204
1205
1206 struct file_list *recv_file_list(int f)
1207 {
1208         struct file_list *flist;
1209         unsigned short flags;
1210         int64 start_read;
1211         extern int list_only;
1212
1213         if (show_filelist_p())
1214                 start_filelist_progress("receiving file list");
1215
1216         start_read = stats.total_read;
1217
1218         flist = new(struct file_list);
1219         if (!flist)
1220                 goto oom;
1221
1222         flist->count = 0;
1223         flist->malloced = 1000;
1224         flist->files = new_array(struct file_struct *, flist->malloced);
1225         if (!flist->files)
1226                 goto oom;
1227
1228
1229         while ((flags = read_byte(f)) != 0) {
1230                 int i = flist->count;
1231
1232                 flist_expand(flist);
1233
1234                 if (protocol_version >= 28 && (flags & XMIT_EXTENDED_FLAGS))
1235                         flags |= read_byte(f) << 8;
1236                 receive_file_entry(&flist->files[i], flags, f);
1237
1238                 if (S_ISREG(flist->files[i]->mode))
1239                         stats.total_size += flist->files[i]->length;
1240
1241                 flist->count++;
1242
1243                 maybe_emit_filelist_progress(flist);
1244
1245                 if (verbose > 2) {
1246                         rprintf(FINFO, "recv_file_name(%s)\n",
1247                                 f_name(flist->files[i]));
1248                 }
1249         }
1250         receive_file_entry(NULL, 0, 0); /* Signal that we're done. */
1251
1252         if (verbose > 2)
1253                 rprintf(FINFO, "received %d names\n", flist->count);
1254
1255         if (show_filelist_p())
1256                 finish_filelist_progress(flist);
1257
1258         clean_flist(flist, relative_paths, 1);
1259
1260         if (f != -1) {
1261                 /* Now send the uid/gid list. This was introduced in
1262                  * protocol version 15 */
1263                 recv_uid_list(f, flist);
1264
1265                 if (!read_batch) {
1266                         /* Recv the io_error flag */
1267                         if (lp_ignore_errors(module_id) || ignore_errors)
1268                                 read_int(f);
1269                         else
1270                                 io_error |= read_int(f);
1271                 }
1272         }
1273
1274         if (verbose > 3)
1275                 output_flist(flist);
1276
1277         if (list_only) {
1278                 int i;
1279                 for (i = 0; i < flist->count; i++)
1280                         list_file_entry(flist->files[i]);
1281         }
1282
1283         if (verbose > 2)
1284                 rprintf(FINFO, "recv_file_list done\n");
1285
1286         stats.flist_size = stats.total_read - start_read;
1287         stats.num_files = flist->count;
1288
1289         return flist;
1290
1291       oom:
1292         out_of_memory("recv_file_list");
1293         return NULL;            /* not reached */
1294 }
1295
1296
1297 int file_compare(struct file_struct **file1, struct file_struct **file2)
1298 {
1299         struct file_struct *f1 = *file1;
1300         struct file_struct *f2 = *file2;
1301
1302         if (!f1->basename && !f2->basename)
1303                 return 0;
1304         if (!f1->basename)
1305                 return -1;
1306         if (!f2->basename)
1307                 return 1;
1308         if (f1->dirname == f2->dirname)
1309                 return u_strcmp(f1->basename, f2->basename);
1310         return f_name_cmp(f1, f2);
1311 }
1312
1313
1314 int flist_find(struct file_list *flist, struct file_struct *f)
1315 {
1316         int low = 0, high = flist->count - 1;
1317
1318         while (high >= 0 && !flist->files[high]->basename) high--;
1319
1320         if (high < 0)
1321                 return -1;
1322
1323         while (low != high) {
1324                 int mid = (low + high) / 2;
1325                 int ret = file_compare(&flist->files[flist_up(flist, mid)],&f);
1326                 if (ret == 0)
1327                         return flist_up(flist, mid);
1328                 if (ret > 0)
1329                         high = mid;
1330                 else
1331                         low = mid + 1;
1332         }
1333
1334         if (file_compare(&flist->files[flist_up(flist, low)], &f) == 0)
1335                 return flist_up(flist, low);
1336         return -1;
1337 }
1338
1339
1340 /*
1341  * Free up any resources a file_struct has allocated, and optionally free
1342  * it up as well.
1343  */
1344 void free_file(struct file_struct *file, int free_the_struct)
1345 {
1346         if (free_the_struct)
1347                 free(file);
1348         else
1349                 memset(file, 0, min_file_struct_len);
1350 }
1351
1352
1353 /*
1354  * allocate a new file list
1355  */
1356 struct file_list *flist_new(void)
1357 {
1358         struct file_list *flist;
1359
1360         flist = new(struct file_list);
1361         if (!flist)
1362                 out_of_memory("send_file_list");
1363
1364         flist->count = 0;
1365         flist->malloced = 0;
1366         flist->files = NULL;
1367
1368         return flist;
1369 }
1370
1371 /*
1372  * free up all elements in a flist
1373  */
1374 void flist_free(struct file_list *flist)
1375 {
1376         int i;
1377         for (i = 1; i < flist->count; i++)
1378                 free_file(flist->files[i], FREE_STRUCT);
1379         free(flist->files);
1380         free(flist);
1381 }
1382
1383
1384 /*
1385  * This routine ensures we don't have any duplicate names in our file list.
1386  * duplicate names can cause corruption because of the pipelining
1387  */
1388 static void clean_flist(struct file_list *flist, int strip_root, int no_dups)
1389 {
1390         int i, prev_i = 0;
1391
1392         if (!flist || flist->count == 0)
1393                 return;
1394
1395         qsort(flist->files, flist->count,
1396               sizeof flist->files[0], (int (*)()) file_compare);
1397
1398         for (i = no_dups? 0 : flist->count; i < flist->count; i++) {
1399                 if (flist->files[i]->basename) {
1400                         prev_i = i;
1401                         break;
1402                 }
1403         }
1404         while (++i < flist->count) {
1405                 if (!flist->files[i]->basename)
1406                         continue;
1407                 if (f_name_cmp(flist->files[i], flist->files[prev_i]) == 0) {
1408                         if (verbose > 1 && !am_server) {
1409                                 rprintf(FINFO,
1410                                         "removing duplicate name %s from file list %d\n",
1411                                         f_name(flist->files[i]), i);
1412                         }
1413                         /* Make sure that if we unduplicate '.', that we don't
1414                          * lose track of a user-specified starting point (or
1415                          * else deletions will mysteriously fail with -R). */
1416                         if (flist->files[i]->flags & FLAG_TOP_DIR)
1417                                 flist->files[prev_i]->flags |= FLAG_TOP_DIR;
1418                         free_file(flist->files[i], CLEAR_STRUCT);
1419                 } else
1420                         prev_i = i;
1421         }
1422
1423         if (strip_root) {
1424                 /* we need to strip off the root directory in the case
1425                    of relative paths, but this must be done _after_
1426                    the sorting phase */
1427                 for (i = 0; i < flist->count; i++) {
1428                         if (flist->files[i]->dirname &&
1429                             flist->files[i]->dirname[0] == '/') {
1430                                 memmove(&flist->files[i]->dirname[0],
1431                                         &flist->files[i]->dirname[1],
1432                                         strlen(flist->files[i]->dirname));
1433                         }
1434
1435                         if (flist->files[i]->dirname &&
1436                             !flist->files[i]->dirname[0]) {
1437                                 flist->files[i]->dirname = NULL;
1438                         }
1439                 }
1440         }
1441 }
1442
1443 static void output_flist(struct file_list *flist)
1444 {
1445         char uidbuf[16], gidbuf[16];
1446         struct file_struct *file;
1447         int i;
1448
1449         for (i = 0; i < flist->count; i++) {
1450                 file = flist->files[i];
1451                 if (am_root && preserve_uid)
1452                         sprintf(uidbuf, " uid=%ld", (long)file->uid);
1453                 else
1454                         *uidbuf = '\0';
1455                 if (preserve_gid && file->gid != GID_NONE)
1456                         sprintf(gidbuf, " gid=%ld", (long)file->gid);
1457                 else
1458                         *gidbuf = '\0';
1459                 rprintf(FINFO, "[%s] i=%d %s %s %s mode=0%o len=%.0f%s%s\n",
1460                         who_am_i(), i, NS(file->basedir), NS(file->dirname),
1461                         NS(file->basename), (int) file->mode,
1462                         (double) file->length, uidbuf, gidbuf);
1463         }
1464 }
1465
1466
1467 enum fnc_state { fnc_DIR, fnc_SLASH, fnc_BASE };
1468
1469 /* Compare the names of two file_struct entities, just like strcmp()
1470  * would do if it were operating on the joined strings.  We assume
1471  * that there are no 0-length strings.
1472  */
1473 int f_name_cmp(struct file_struct *f1, struct file_struct *f2)
1474 {
1475         int dif;
1476         const uchar *c1, *c2;
1477         enum fnc_state state1, state2;
1478
1479         if (!f1 || !f1->basename) {
1480                 if (!f2 || !f2->basename)
1481                         return 0;
1482                 return -1;
1483         }
1484         if (!f2 || !f2->basename)
1485                 return 1;
1486
1487         if (!(c1 = (uchar*)f1->dirname)) {
1488                 state1 = fnc_BASE;
1489                 c1 = (uchar*)f1->basename;
1490         } else
1491                 state1 = fnc_DIR;
1492         if (!(c2 = (uchar*)f2->dirname)) {
1493                 state2 = fnc_BASE;
1494                 c2 = (uchar*)f2->basename;
1495         } else
1496                 state2 = fnc_DIR;
1497
1498         while (1) {
1499                 if ((dif = (int)*c1 - (int)*c2) != 0)
1500                         break;
1501                 if (!*++c1) {
1502                         switch (state1) {
1503                         case fnc_DIR:
1504                                 state1 = fnc_SLASH;
1505                                 c1 = (uchar*)"/";
1506                                 break;
1507                         case fnc_SLASH:
1508                                 state1 = fnc_BASE;
1509                                 c1 = (uchar*)f1->basename;
1510                                 break;
1511                         case fnc_BASE:
1512                                 break;
1513                         }
1514                 }
1515                 if (!*++c2) {
1516                         switch (state2) {
1517                         case fnc_DIR:
1518                                 state2 = fnc_SLASH;
1519                                 c2 = (uchar*)"/";
1520                                 break;
1521                         case fnc_SLASH:
1522                                 state2 = fnc_BASE;
1523                                 c2 = (uchar*)f2->basename;
1524                                 break;
1525                         case fnc_BASE:
1526                                 if (!*c1)
1527                                         return 0;
1528                                 break;
1529                         }
1530                 }
1531         }
1532
1533         return dif;
1534 }
1535
1536
1537 /* Return a copy of the full filename of a flist entry, using the indicated
1538  * buffer.  No size-checking is done because we checked the size when creating
1539  * the file_struct entry.
1540  */
1541 char *f_name_to(struct file_struct *f, char *fbuf)
1542 {
1543         if (!f || !f->basename)
1544                 return NULL;
1545
1546         if (f->dirname) {
1547                 int len = strlen(f->dirname);
1548                 memcpy(fbuf, f->dirname, len);
1549                 fbuf[len] = '/';
1550                 strcpy(fbuf + len + 1, f->basename);
1551         } else
1552                 strcpy(fbuf, f->basename);
1553         return fbuf;
1554 }
1555
1556
1557 /* Like f_name_to(), but we rotate through 5 static buffers of our own.
1558  */
1559 char *f_name(struct file_struct *f)
1560 {
1561         static char names[5][MAXPATHLEN];
1562         static unsigned int n;
1563
1564         n = (n + 1) % (sizeof names / sizeof names[0]);
1565
1566         return f_name_to(f, names[n]);
1567 }