receiver.c

   1 /*
   2  * Routines only used by the receiving process.
   3  *
   4  * Copyright (C) 1996-2000 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2003-2007 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, visit the http://fsf.org website.
  20  */
  21
  22 #include "rsync.h"
  23
  24 extern int verbose;
  25 extern int dry_run;
  26 extern int do_xfers;
  27 extern int am_server;
  28 extern int do_progress;
  29 extern int inc_recurse;
  30 extern int log_before_transfer;
  31 extern int stdout_format_has_i;
  32 extern int logfile_format_has_i;
  33 extern int csum_length;
  34 extern int read_batch;
  35 extern int write_batch;
  36 extern int batch_gen_fd;
  37 extern int protocol_version;
  38 extern int relative_paths;
  39 extern int preserve_hard_links;
  40 extern int preserve_perms;
  41 extern int preserve_xattrs;
  42 extern int basis_dir_cnt;
  43 extern int make_backups;
  44 extern int cleanup_got_literal;
  45 extern int remove_source_files;
  46 extern int append_mode;
  47 extern int sparse_files;
  48 extern int keep_partial;
  49 extern int checksum_seed;
  50 extern int inplace;
  51 extern int delay_updates;
  52 extern mode_t orig_umask;
  53 extern struct stats stats;
  54 extern char *tmpdir;
  55 extern char *partial_dir;
  56 extern char *basis_dir[];
  57 extern struct file_list *cur_flist, *first_flist, *dir_flist;
  58 extern struct filter_list_struct server_filter_list;
  59
  60 static struct bitbag *delayed_bits = NULL;
  61 static int phase = 0, redoing = 0;
  62 /* We're either updating the basis file or an identical copy: */
  63 static int updating_basis;
  64
  65 /*
  66  * get_tmpname() - create a tmp filename for a given filename
  67  *
  68  *   If a tmpdir is defined, use that as the directory to
  69  *   put it in.  Otherwise, the tmp filename is in the same
  70  *   directory as the given name.  Note that there may be no
  71  *   directory at all in the given name!
  72  *
  73  *   The tmp filename is basically the given filename with a
  74  *   dot prepended, and .XXXXXX appended (for mkstemp() to
  75  *   put its unique gunk in).  Take care to not exceed
  76  *   either the MAXPATHLEN or NAME_MAX, esp. the last, as
  77  *   the basename basically becomes 8 chars longer. In that
  78  *   case, the original name is shortened sufficiently to
  79  *   make it all fit.
  80  *
  81  *   Of course, there's no real reason for the tmp name to
  82  *   look like the original, except to satisfy us humans.
  83  *   As long as it's unique, rsync will work.
  84  */
  85
  86 int get_tmpname(char *fnametmp, const char *fname)
  87 {
  88         int maxname, added, length = 0;
  89         const char *f;
  90
  91         if (tmpdir) {
  92                 /* Note: this can't overflow, so the return value is safe */
  93                 length = strlcpy(fnametmp, tmpdir, MAXPATHLEN - 2);
  94                 fnametmp[length++] = '/';
  95         }
  96
  97         if ((f = strrchr(fname, '/')) != NULL) {
  98                 ++f;
  99                 if (!tmpdir) {
 100                         length = f - fname;
 101                         /* copy up to and including the slash */
 102                         strlcpy(fnametmp, fname, length + 1);
 103                 }
 104         } else
 105                 f = fname;
 106         fnametmp[length++] = '.';
 107
 108         /* The maxname value is bufsize, and includes space for the '\0'.
 109          * (Note that NAME_MAX get -8 for the leading '.' above.) */
 110         maxname = MIN(MAXPATHLEN - 7 - length, NAME_MAX - 8);
 111
 112         if (maxname < 1) {
 113                 rprintf(FERROR, "temporary filename too long: %s\n", fname);
 114                 fnametmp[0] = '\0';
 115                 return 0;
 116         }
 117
 118         added = strlcpy(fnametmp + length, f, maxname);
 119         if (added >= maxname)
 120                 added = maxname - 1;
 121         memcpy(fnametmp + length + added, ".XXXXXX", 8);
 122
 123         return 1;
 124 }
 125
 126
 127 static int receive_data(int f_in, char *fname_r, int fd_r, OFF_T size_r,
 128                         const char *fname, int fd, OFF_T total_size)
 129 {
 130         static char file_sum1[MAX_DIGEST_LEN];
 131         static char file_sum2[MAX_DIGEST_LEN];
 132         struct map_struct *mapbuf;
 133         struct sum_struct sum;
 134         int32 len, sum_len;
 135         OFF_T offset = 0;
 136         OFF_T offset2;
 137         char *data;
 138         int32 i;
 139         char *map = NULL;
 140
 141         read_sum_head(f_in, &sum);
 142
 143         if (fd_r >= 0 && size_r > 0) {
 144                 int32 read_size = MAX(sum.blength * 2, 16*1024);
 145                 mapbuf = map_file(fd_r, size_r, read_size, sum.blength);
 146                 if (verbose > 2) {
 147                         rprintf(FINFO, "recv mapped %s of size %.0f\n",
 148                                 fname_r, (double)size_r);
 149                 }
 150         } else
 151                 mapbuf = NULL;
 152
 153         sum_init(checksum_seed);
 154
 155         if (append_mode > 0) {
 156                 OFF_T j;
 157                 sum.flength = (OFF_T)sum.count * sum.blength;
 158                 if (sum.remainder)
 159                         sum.flength -= sum.blength - sum.remainder;
 160                 if (append_mode == 2) {
 161                         for (j = CHUNK_SIZE; j < sum.flength; j += CHUNK_SIZE) {
 162                                 if (do_progress)
 163                                         show_progress(offset, total_size);
 164                                 sum_update(map_ptr(mapbuf, offset, CHUNK_SIZE),
 165                                            CHUNK_SIZE);
 166                                 offset = j;
 167                         }
 168                         if (offset < sum.flength) {
 169                                 int32 len = (int32)(sum.flength - offset);
 170                                 if (do_progress)
 171                                         show_progress(offset, total_size);
 172                                 sum_update(map_ptr(mapbuf, offset, len), len);
 173                         }
 174                 }
 175                 offset = sum.flength;
 176                 if (fd != -1 && (j = do_lseek(fd, offset, SEEK_SET)) != offset) {
 177                         rsyserr(FERROR, errno, "lseek of %s returned %.0f, not %.0f",
 178                                 full_fname(fname), (double)j, (double)offset);
 179                         exit_cleanup(RERR_FILEIO);
 180                 }
 181         }
 182
 183         while ((i = recv_token(f_in, &data)) != 0) {
 184                 if (do_progress)
 185                         show_progress(offset, total_size);
 186
 187                 if (i > 0) {
 188                         if (verbose > 3) {
 189                                 rprintf(FINFO,"data recv %d at %.0f\n",
 190                                         i,(double)offset);
 191                         }
 192
 193                         stats.literal_data += i;
 194                         cleanup_got_literal = 1;
 195
 196                         sum_update(data, i);
 197
 198                         if (fd != -1 && write_file(fd,data,i) != i)
 199                                 goto report_write_error;
 200                         offset += i;
 201                         continue;
 202                 }
 203
 204                 i = -(i+1);
 205                 offset2 = i * (OFF_T)sum.blength;
 206                 len = sum.blength;
 207                 if (i == (int)sum.count-1 && sum.remainder != 0)
 208                         len = sum.remainder;
 209
 210                 stats.matched_data += len;
 211
 212                 if (verbose > 3) {
 213                         rprintf(FINFO,
 214                                 "chunk[%d] of size %ld at %.0f offset=%.0f\n",
 215                                 i, (long)len, (double)offset2, (double)offset);
 216                 }
 217
 218                 if (mapbuf) {
 219                         map = map_ptr(mapbuf,offset2,len);
 220
 221                         see_token(map, len);
 222                         sum_update(map, len);
 223                 }
 224
 225                 if (updating_basis) {
 226                         if (offset == offset2 && fd != -1) {
 227                                 OFF_T pos;
 228                                 if (flush_write_file(fd) < 0)
 229                                         goto report_write_error;
 230                                 offset += len;
 231                                 if ((pos = do_lseek(fd, len, SEEK_CUR)) != offset) {
 232                                         rsyserr(FERROR, errno,
 233                                                 "lseek of %s returned %.0f, not %.0f",
 234                                                 full_fname(fname),
 235                                                 (double)pos, (double)offset);
 236                                         exit_cleanup(RERR_FILEIO);
 237                                 }
 238                                 continue;
 239                         }
 240                 }
 241                 if (fd != -1 && map && write_file(fd, map, len) != (int)len)
 242                         goto report_write_error;
 243                 offset += len;
 244         }
 245
 246         if (flush_write_file(fd) < 0)
 247                 goto report_write_error;
 248
 249 #ifdef HAVE_FTRUNCATE
 250         if (inplace && fd != -1)
 251                 ftruncate(fd, offset);
 252 #endif
 253
 254         if (do_progress)
 255                 end_progress(total_size);
 256
 257         if (fd != -1 && offset > 0 && sparse_end(fd) != 0) {
 258             report_write_error:
 259                 rsyserr(FERROR, errno, "write failed on %s",
 260                         full_fname(fname));
 261                 exit_cleanup(RERR_FILEIO);
 262         }
 263
 264         sum_len = sum_end(file_sum1);
 265
 266         if (mapbuf)
 267                 unmap_file(mapbuf);
 268
 269         read_buf(f_in, file_sum2, sum_len);
 270         if (verbose > 2)
 271                 rprintf(FINFO,"got file_sum\n");
 272         if (fd != -1 && memcmp(file_sum1, file_sum2, sum_len) != 0)
 273                 return 0;
 274         return 1;
 275 }
 276
 277
 278 static void discard_receive_data(int f_in, OFF_T length)
 279 {
 280         receive_data(f_in, NULL, -1, 0, NULL, -1, length);
 281 }
 282
 283 static void handle_delayed_updates(char *local_name)
 284 {
 285         char *fname, *partialptr;
 286         int ndx;
 287
 288         for (ndx = -1; (ndx = bitbag_next_bit(delayed_bits, ndx)) >= 0; ) {
 289                 struct file_struct *file = cur_flist->files[ndx];
 290                 fname = local_name ? local_name : f_name(file, NULL);
 291                 if ((partialptr = partial_dir_fname(fname)) != NULL) {
 292                         if (make_backups > 0 && !make_backup(fname))
 293                                 continue;
 294                         if (verbose > 2) {
 295                                 rprintf(FINFO, "renaming %s to %s\n",
 296                                         partialptr, fname);
 297                         }
 298                         /* We don't use robust_rename() here because the
 299                          * partial-dir must be on the same drive. */
 300                         if (do_rename(partialptr, fname) < 0) {
 301                                 rsyserr(FERROR, errno,
 302                                         "rename failed for %s (from %s)",
 303                                         full_fname(fname), partialptr);
 304                         } else {
 305                                 if (remove_source_files
 306                                  || (preserve_hard_links && F_IS_HLINKED(file)))
 307                                         send_msg_int(MSG_SUCCESS, ndx);
 308                                 handle_partial_dir(partialptr, PDIR_DELETE);
 309                         }
 310                 }
 311         }
 312 }
 313
 314 static int get_next_gen_ndx(int fd, int next_gen_ndx, int desired_ndx)
 315 {
 316         while (next_gen_ndx < desired_ndx) {
 317                 if (next_gen_ndx >= 0) {
 318                         rprintf(FINFO,
 319                                 "(No batched update for%s \"%s\")\n",
 320                                 redoing ? " resend of" : "",
 321                                 f_name(cur_flist->files[next_gen_ndx], NULL));
 322                 }
 323                 next_gen_ndx = read_int(fd);
 324                 if (next_gen_ndx == -1) {
 325                         if (inc_recurse)
 326                                 next_gen_ndx = first_flist->prev->used + first_flist->prev->ndx_start;
 327                         else
 328                                 next_gen_ndx = cur_flist->used;
 329                 }
 330         }
 331         return next_gen_ndx;
 332 }
 333
 334 /**
 335  * main routine for receiver process.
 336  *
 337  * Receiver process runs on the same host as the generator process. */
 338 int recv_files(int f_in, char *local_name)
 339 {
 340         int next_gen_ndx = -1;
 341         int fd1,fd2;
 342         STRUCT_STAT st;
 343         int iflags, xlen;
 344         char *fname, fbuf[MAXPATHLEN];
 345         char xname[MAXPATHLEN];
 346         char fnametmp[MAXPATHLEN];
 347         char *fnamecmp, *partialptr;
 348         char fnamecmpbuf[MAXPATHLEN];
 349         uchar fnamecmp_type;
 350         struct file_struct *file;
 351         struct stats initial_stats;
 352         int itemizing = am_server ? logfile_format_has_i : stdout_format_has_i;
 353         enum logcode log_code = log_before_transfer ? FLOG : FINFO;
 354         int max_phase = protocol_version >= 29 ? 2 : 1;
 355         int dflt_perms = (ACCESSPERMS & ~orig_umask);
 356 #ifdef SUPPORT_ACLS
 357         const char *parent_dirname = "";
 358 #endif
 359         int ndx, recv_ok;
 360
 361         if (verbose > 2)
 362                 rprintf(FINFO, "recv_files(%d) starting\n", cur_flist->used);
 363
 364         if (delay_updates)
 365                 delayed_bits = bitbag_create(cur_flist->used + 1);
 366
 367         while (1) {
 368                 cleanup_disable();
 369
 370                 /* This call also sets cur_flist. */
 371                 ndx = read_ndx_and_attrs(f_in, &iflags, &fnamecmp_type,
 372                                          xname, &xlen);
 373                 if (ndx == NDX_DONE) {
 374                         if (inc_recurse && first_flist) {
 375                                 flist_free(first_flist);
 376                                 if (first_flist)
 377                                         continue;
 378                         }
 379                         if (read_batch && cur_flist) {
 380                                 int high = inc_recurse
 381                                     ? first_flist->prev->used + first_flist->prev->ndx_start
 382                                     : cur_flist->used;
 383                                 get_next_gen_ndx(batch_gen_fd, next_gen_ndx, high);
 384                                 next_gen_ndx = -1;
 385                         }
 386                         if (++phase > max_phase)
 387                                 break;
 388                         if (verbose > 2)
 389                                 rprintf(FINFO, "recv_files phase=%d\n", phase);
 390                         if (phase == 2 && delay_updates)
 391                                 handle_delayed_updates(local_name);
 392                         send_msg(MSG_DONE, "", 0, 0);
 393                         continue;
 394                 }
 395
 396                 if (ndx - cur_flist->ndx_start >= 0)
 397                         file = cur_flist->files[ndx - cur_flist->ndx_start];
 398                 else
 399                         file = dir_flist->files[cur_flist->parent_ndx];
 400                 fname = local_name ? local_name : f_name(file, fbuf);
 401
 402                 if (verbose > 2)
 403                         rprintf(FINFO, "recv_files(%s)\n", fname);
 404
 405 #ifdef SUPPORT_XATTRS
 406                 if (iflags & ITEM_REPORT_XATTR && !dry_run)
 407                         recv_xattr_request(file, f_in);
 408 #endif
 409
 410                 if (!(iflags & ITEM_TRANSFER)) {
 411                         maybe_log_item(file, iflags, itemizing, xname);
 412 #ifdef SUPPORT_XATTRS
 413                         if (preserve_xattrs && iflags & ITEM_REPORT_XATTR && !dry_run)
 414                                 set_file_attrs(fname, file, NULL, fname, 0);
 415 #endif
 416                         continue;
 417                 }
 418                 if (phase == 2) {
 419                         rprintf(FERROR,
 420                                 "got transfer request in phase 2 [%s]\n",
 421                                 who_am_i());
 422                         exit_cleanup(RERR_PROTOCOL);
 423                 }
 424
 425                 if (file->flags & FLAG_FILE_SENT) {
 426                         if (csum_length == SHORT_SUM_LENGTH) {
 427                                 if (keep_partial && !partial_dir)
 428                                         make_backups = -make_backups; /* prevents double backup */
 429                                 if (append_mode)
 430                                         sparse_files = -sparse_files;
 431                                 append_mode = -append_mode;
 432                                 csum_length = SUM_LENGTH;
 433                                 redoing = 1;
 434                         }
 435                 } else {
 436                         if (csum_length != SHORT_SUM_LENGTH) {
 437                                 if (keep_partial && !partial_dir)
 438                                         make_backups = -make_backups;
 439                                 if (append_mode)
 440                                         sparse_files = -sparse_files;
 441                                 append_mode = -append_mode;
 442                                 csum_length = SHORT_SUM_LENGTH;
 443                                 redoing = 0;
 444                         }
 445                 }
 446
 447                 stats.current_file_index = ndx;
 448                 stats.num_transferred_files++;
 449                 stats.total_transferred_size += F_LENGTH(file);
 450                 cleanup_got_literal = 0;
 451
 452                 if (server_filter_list.head
 453                     && check_filter(&server_filter_list, fname, 0) < 0) {
 454                         rprintf(FERROR, "attempt to hack rsync failed.\n");
 455                         exit_cleanup(RERR_PROTOCOL);
 456                 }
 457
 458                 if (!do_xfers) { /* log the transfer */
 459                         log_item(FCLIENT, file, &stats, iflags, NULL);
 460                         if (read_batch)
 461                                 discard_receive_data(f_in, F_LENGTH(file));
 462                         continue;
 463                 }
 464                 if (write_batch < 0) {
 465                         log_item(FINFO, file, &stats, iflags, NULL);
 466                         if (!am_server)
 467                                 discard_receive_data(f_in, F_LENGTH(file));
 468                         continue;
 469                 }
 470
 471                 if (read_batch) {
 472                         next_gen_ndx = get_next_gen_ndx(batch_gen_fd, next_gen_ndx, ndx);
 473                         if (ndx < next_gen_ndx) {
 474                                 rprintf(FINFO,
 475                                         "(Skipping batched update for \"%s\")\n",
 476                                         fname);
 477                                 discard_receive_data(f_in, F_LENGTH(file));
 478                                 if (inc_recurse)
 479                                         send_msg_int(MSG_NO_SEND, ndx);
 480                                 continue;
 481                         }
 482                         next_gen_ndx = -1;
 483                 }
 484
 485                 partialptr = partial_dir ? partial_dir_fname(fname) : fname;
 486
 487                 if (protocol_version >= 29) {
 488                         switch (fnamecmp_type) {
 489                         case FNAMECMP_FNAME:
 490                                 fnamecmp = fname;
 491                                 break;
 492                         case FNAMECMP_PARTIAL_DIR:
 493                                 fnamecmp = partialptr;
 494                                 break;
 495                         case FNAMECMP_BACKUP:
 496                                 fnamecmp = get_backup_name(fname);
 497                                 break;
 498                         case FNAMECMP_FUZZY:
 499                                 if (file->dirname) {
 500                                         pathjoin(fnamecmpbuf, MAXPATHLEN,
 501                                                  file->dirname, xname);
 502                                         fnamecmp = fnamecmpbuf;
 503                                 } else
 504                                         fnamecmp = xname;
 505                                 break;
 506                         default:
 507                                 if (fnamecmp_type >= basis_dir_cnt) {
 508                                         rprintf(FERROR,
 509                                                 "invalid basis_dir index: %d.\n",
 510                                                 fnamecmp_type);
 511                                         exit_cleanup(RERR_PROTOCOL);
 512                                 }
 513                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 514                                          basis_dir[fnamecmp_type], fname);
 515                                 fnamecmp = fnamecmpbuf;
 516                                 break;
 517                         }
 518                         if (!fnamecmp || (server_filter_list.head
 519                           && check_filter(&server_filter_list, fname, 0) < 0))
 520                                 fnamecmp = fname;
 521                 } else {
 522                         /* Reminder: --inplace && --partial-dir are never
 523                          * enabled at the same time. */
 524                         if (inplace && make_backups > 0) {
 525                                 if (!(fnamecmp = get_backup_name(fname)))
 526                                         fnamecmp = fname;
 527                         } else if (partial_dir && partialptr)
 528                                 fnamecmp = partialptr;
 529                         else
 530                                 fnamecmp = fname;
 531                 }
 532
 533                 initial_stats = stats;
 534
 535                 /* open the file */
 536                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 537
 538                 if (fd1 == -1 && protocol_version < 29) {
 539                         if (fnamecmp != fname) {
 540                                 fnamecmp = fname;
 541                                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 542                         }
 543
 544                         if (fd1 == -1 && basis_dir[0]) {
 545                                 /* pre-29 allowed only one alternate basis */
 546                                 pathjoin(fnamecmpbuf, sizeof fnamecmpbuf,
 547                                          basis_dir[0], fname);
 548                                 fnamecmp = fnamecmpbuf;
 549                                 fd1 = do_open(fnamecmp, O_RDONLY, 0);
 550                         }
 551                 }
 552                 updating_basis = inplace && fnamecmp == fname;
 553
 554                 if (fd1 == -1) {
 555                         st.st_mode = 0;
 556                         st.st_size = 0;
 557                 } else if (do_fstat(fd1,&st) != 0) {
 558                         rsyserr(FERROR, errno, "fstat %s failed",
 559                                 full_fname(fnamecmp));
 560                         discard_receive_data(f_in, F_LENGTH(file));
 561                         close(fd1);
 562                         if (inc_recurse)
 563                                 send_msg_int(MSG_NO_SEND, ndx);
 564                         continue;
 565                 }
 566
 567                 if (fd1 != -1 && S_ISDIR(st.st_mode) && fnamecmp == fname) {
 568                         /* this special handling for directories
 569                          * wouldn't be necessary if robust_rename()
 570                          * and the underlying robust_unlink could cope
 571                          * with directories
 572                          */
 573                         rprintf(FERROR,"recv_files: %s is a directory\n",
 574                                 full_fname(fnamecmp));
 575                         discard_receive_data(f_in, F_LENGTH(file));
 576                         close(fd1);
 577                         if (inc_recurse)
 578                                 send_msg_int(MSG_NO_SEND, ndx);
 579                         continue;
 580                 }
 581
 582                 if (fd1 != -1 && !S_ISREG(st.st_mode)) {
 583                         close(fd1);
 584                         fd1 = -1;
 585                 }
 586
 587                 /* If we're not preserving permissions, change the file-list's
 588                  * mode based on the local permissions and some heuristics. */
 589                 if (!preserve_perms) {
 590                         int exists = fd1 != -1;
 591 #ifdef SUPPORT_ACLS
 592                         const char *dn = file->dirname ? file->dirname : ".";
 593                         if (parent_dirname != dn
 594                          && strcmp(parent_dirname, dn) != 0) {
 595                                 dflt_perms = default_perms_for_dir(dn);
 596                                 parent_dirname = dn;
 597                         }
 598 #endif
 599                         file->mode = dest_mode(file->mode, st.st_mode,
 600                                                dflt_perms, exists);
 601                 }
 602
 603                 /* We now check to see if we are writing the file "inplace" */
 604                 if (inplace)  {
 605                         fd2 = do_open(fname, O_WRONLY|O_CREAT, 0600);
 606                         if (fd2 == -1) {
 607                                 rsyserr(FERROR, errno, "open %s failed",
 608                                         full_fname(fname));
 609                                 discard_receive_data(f_in, F_LENGTH(file));
 610                                 if (fd1 != -1)
 611                                         close(fd1);
 612                                 if (inc_recurse)
 613                                         send_msg_int(MSG_NO_SEND, ndx);
 614                                 continue;
 615                         }
 616                 } else {
 617                         if (!get_tmpname(fnametmp,fname)) {
 618                                 discard_receive_data(f_in, F_LENGTH(file));
 619                                 if (fd1 != -1)
 620                                         close(fd1);
 621                                 if (inc_recurse)
 622                                         send_msg_int(MSG_NO_SEND, ndx);
 623                                 continue;
 624                         }
 625
 626                         /* we initially set the perms without the
 627                          * setuid/setgid bits to ensure that there is no race
 628                          * condition. They are then correctly updated after
 629                          * the lchown. Thanks to snabb@epipe.fi for pointing
 630                          * this out.  We also set it initially without group
 631                          * access because of a similar race condition. */
 632                         fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 633
 634                         /* in most cases parent directories will already exist
 635                          * because their information should have been previously
 636                          * transferred, but that may not be the case with -R */
 637                         if (fd2 == -1 && relative_paths && errno == ENOENT
 638                             && create_directory_path(fnametmp) == 0) {
 639                                 /* Get back to name with XXXXXX in it. */
 640                                 get_tmpname(fnametmp, fname);
 641                                 fd2 = do_mkstemp(fnametmp, file->mode & INITACCESSPERMS);
 642                         }
 643                         if (fd2 == -1) {
 644                                 rsyserr(FERROR, errno, "mkstemp %s failed",
 645                                         full_fname(fnametmp));
 646                                 discard_receive_data(f_in, F_LENGTH(file));
 647                                 if (fd1 != -1)
 648                                         close(fd1);
 649                                 if (inc_recurse)
 650                                         send_msg_int(MSG_NO_SEND, ndx);
 651                                 continue;
 652                         }
 653
 654                         cleanup_set(fnametmp, partialptr, file, fd1, fd2);
 655                 }
 656
 657                 /* log the transfer */
 658                 if (log_before_transfer)
 659                         log_item(FCLIENT, file, &initial_stats, iflags, NULL);
 660                 else if (!am_server && verbose && do_progress)
 661                         rprintf(FINFO, "%s\n", fname);
 662
 663                 /* recv file data */
 664                 recv_ok = receive_data(f_in, fnamecmp, fd1, st.st_size,
 665                                        fname, fd2, F_LENGTH(file));
 666
 667                 log_item(log_code, file, &initial_stats, iflags, NULL);
 668
 669                 if (fd1 != -1)
 670                         close(fd1);
 671                 if (close(fd2) < 0) {
 672                         rsyserr(FERROR, errno, "close failed on %s",
 673                                 full_fname(fnametmp));
 674                         exit_cleanup(RERR_FILEIO);
 675                 }
 676
 677                 if ((recv_ok && (!delay_updates || !partialptr)) || inplace) {
 678                         char *temp_copy_name;
 679                         if (partialptr == fname)
 680                                 partialptr = temp_copy_name = NULL;
 681                         else if (*partial_dir == '/')
 682                                 temp_copy_name = NULL;
 683                         else
 684                                 temp_copy_name = partialptr;
 685                         finish_transfer(fname, fnametmp, fnamecmp,
 686                                         temp_copy_name, file, recv_ok, 1);
 687                         if (fnamecmp == partialptr) {
 688                                 do_unlink(partialptr);
 689                                 handle_partial_dir(partialptr, PDIR_DELETE);
 690                         }
 691                 } else if (keep_partial && partialptr
 692                     && handle_partial_dir(partialptr, PDIR_CREATE)) {
 693                         finish_transfer(partialptr, fnametmp, fnamecmp, NULL,
 694                                         file, recv_ok, !partial_dir);
 695                         if (delay_updates && recv_ok) {
 696                                 bitbag_set_bit(delayed_bits, ndx);
 697                                 recv_ok = -1;
 698                         }
 699                 } else {
 700                         partialptr = NULL;
 701                         do_unlink(fnametmp);
 702                 }
 703
 704                 cleanup_disable();
 705
 706                 if (recv_ok > 0) {
 707                         if (remove_source_files || inc_recurse
 708                          || (preserve_hard_links && F_IS_HLINKED(file)))
 709                                 send_msg_int(MSG_SUCCESS, ndx);
 710                 } else if (!recv_ok) {
 711                         enum logcode msgtype = redoing || read_batch ? FERROR : FINFO;
 712                         if (msgtype == FERROR || verbose) {
 713                                 char *errstr, *redostr, *keptstr;
 714                                 if (!(keep_partial && partialptr) && !inplace)
 715                                         keptstr = "discarded";
 716                                 else if (partial_dir)
 717                                         keptstr = "put into partial-dir";
 718                                 else
 719                                         keptstr = "retained";
 720                                 if (msgtype == FERROR) {
 721                                         errstr = "ERROR";
 722                                         redostr = "";
 723                                 } else {
 724                                         errstr = "WARNING";
 725                                         redostr = " (will try again)";
 726                                 }
 727                                 rprintf(msgtype,
 728                                         "%s: %s failed verification -- update %s%s.\n",
 729                                         errstr, fname, keptstr, redostr);
 730                         }
 731                         if (!redoing) {
 732                                 send_msg_int(MSG_REDO, ndx);
 733                                 file->flags |= FLAG_FILE_SENT;
 734                         } else if (inc_recurse)
 735                                 send_msg_int(MSG_NO_SEND, ndx);
 736                 }
 737         }
 738         if (make_backups < 0)
 739                 make_backups = -make_backups;
 740
 741         if (phase == 2 && delay_updates) /* for protocol_version < 29 */
 742                 handle_delayed_updates(local_name);
 743
 744         if (verbose > 2)
 745                 rprintf(FINFO,"recv_files finished\n");
 746
 747         return 0;
 748 }