rsync.c

   1 /*
   2  * Routines common to more than one of the rsync processes.
   3  *
   4  * Copyright (C) 1996 Andrew Tridgell
   5  * Copyright (C) 1996 Paul Mackerras
   6  * Copyright (C) 2003-2022 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 #include "ifuncs.h"
  24 #if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
  25 #include <libcharset.h>
  26 #elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
  27 #include <langinfo.h>
  28 #endif
  29
  30 extern int dry_run;
  31 extern int preserve_acls;
  32 extern int preserve_xattrs;
  33 extern int preserve_perms;
  34 extern int preserve_executability;
  35 extern int preserve_mtimes;
  36 extern int omit_dir_times;
  37 extern int omit_link_times;
  38 extern int am_root;
  39 extern int am_server;
  40 extern int am_daemon;
  41 extern int am_sender;
  42 extern int am_receiver;
  43 extern int am_generator;
  44 extern int am_starting_up;
  45 extern int allow_8bit_chars;
  46 extern int protocol_version;
  47 extern int got_kill_signal;
  48 extern int called_from_signal_handler;
  49 extern int inc_recurse;
  50 extern int inplace;
  51 extern int flist_eof;
  52 extern int file_old_total;
  53 extern int keep_dirlinks;
  54 extern int make_backups;
  55 extern int sanitize_paths;
  56 extern struct file_list *cur_flist, *first_flist, *dir_flist;
  57 extern struct chmod_mode_struct *daemon_chmod_modes;
  58 #ifdef ICONV_OPTION
  59 extern char *iconv_opt;
  60 #endif
  61
  62 #define UPDATED_OWNER (1<<0)
  63 #define UPDATED_GROUP (1<<1)
  64 #define UPDATED_MTIME (1<<2)
  65 #define UPDATED_ATIME (1<<3)
  66 #define UPDATED_ACLS  (1<<4)
  67 #define UPDATED_MODE  (1<<5)
  68 #define UPDATED_CRTIME (1<<6)
  69
  70 #ifdef ICONV_CONST
  71 iconv_t ic_chck = (iconv_t)-1;
  72 # ifdef ICONV_OPTION
  73 iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
  74 # endif
  75
  76 static const char *default_charset(void)
  77 {
  78 # if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
  79         return locale_charset();
  80 # elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
  81         return nl_langinfo(CODESET);
  82 # else
  83         return ""; /* Works with (at the very least) gnu iconv... */
  84 # endif
  85 }
  86
  87 void setup_iconv(void)
  88 {
  89         const char *defset = default_charset();
  90 # ifdef ICONV_OPTION
  91         const char *charset;
  92         char *cp;
  93 # endif
  94
  95         if (!am_server && !allow_8bit_chars) {
  96                 /* It's OK if this fails... */
  97                 ic_chck = iconv_open(defset, defset);
  98
  99                 if (DEBUG_GTE(ICONV, 2)) {
 100                         if (ic_chck == (iconv_t)-1) {
 101                                 rprintf(FINFO,
 102                                         "msg checking via isprint()"
 103                                         " (iconv_open(\"%s\", \"%s\") errno: %d)\n",
 104                                         defset, defset, errno);
 105                         } else {
 106                                 rprintf(FINFO,
 107                                         "msg checking charset: %s\n",
 108                                         defset);
 109                         }
 110                 }
 111         } else
 112                 ic_chck = (iconv_t)-1;
 113
 114 # ifdef ICONV_OPTION
 115         if (!iconv_opt)
 116                 return;
 117
 118         if ((cp = strchr(iconv_opt, ',')) != NULL) {
 119                 if (am_server) /* A local transfer needs this. */
 120                         iconv_opt = cp + 1;
 121                 else
 122                         *cp = '\0';
 123         }
 124
 125         if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))
 126                 charset = defset;
 127         else
 128                 charset = iconv_opt;
 129
 130         if ((ic_send = iconv_open(UTF8_CHARSET, charset)) == (iconv_t)-1) {
 131                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 132                         UTF8_CHARSET, charset);
 133                 exit_cleanup(RERR_UNSUPPORTED);
 134         }
 135
 136         if ((ic_recv = iconv_open(charset, UTF8_CHARSET)) == (iconv_t)-1) {
 137                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 138                         charset, UTF8_CHARSET);
 139                 exit_cleanup(RERR_UNSUPPORTED);
 140         }
 141
 142         if (DEBUG_GTE(ICONV, 1)) {
 143                 rprintf(FINFO, "[%s] charset: %s\n",
 144                         who_am_i(), *charset ? charset : "[LOCALE]");
 145         }
 146 # endif
 147 }
 148
 149 /* This function converts the chars in the "in" xbuf into characters in the
 150  * "out" xbuf.  The ".len" chars of the "in" xbuf is used starting from its
 151  * ".pos".  The ".size" of the "out" xbuf restricts how many characters can
 152  * be stored, starting at its ".pos+.len" position.  Note that the last byte
 153  * of the "out" xbuf is not used, which reserves space for a trailing '\0'
 154  * (though it is up to the caller to store a trailing '\0', as needed).
 155  *
 156  * We return a 0 on success or a -1 on error.  An error also sets errno to
 157  * E2BIG, EILSEQ, or EINVAL (see below); otherwise errno will be set to 0.
 158  * The "in" xbuf is altered to update ".pos" and ".len".  The "out" xbuf has
 159  * data appended, and its ".len" incremented (see below for a ".size" note).
 160  *
 161  * If ICB_CIRCULAR_OUT is set in "flags", the chars going into the "out" xbuf
 162  * can wrap around to the start, and the xbuf may have its ".size" reduced
 163  * (presumably by 1 byte) if the iconv code doesn't have space to store a
 164  * multi-byte character at the physical end of the ".buf" (though no reducing
 165  * happens if ".pos" is <= 1, since there is no room to wrap around).
 166  *
 167  * If ICB_EXPAND_OUT is set in "flags", the "out" xbuf will be allocated if
 168  * empty, and (as long as ICB_CIRCULAR_OUT is not set) expanded if too small.
 169  * This prevents the return of E2BIG (except for a circular xbuf).
 170  *
 171  * If ICB_INCLUDE_BAD is set in "flags", any badly-encoded chars are included
 172  * verbatim in the "out" xbuf, so EILSEQ will not be returned.
 173  *
 174  * If ICB_INCLUDE_INCOMPLETE is set in "flags", any incomplete multi-byte
 175  * chars are included, which ensures that EINVAL is not returned.
 176  *
 177  * If ICB_INIT is set, the iconv() conversion state is initialized prior to
 178  * processing the characters. */
 179 int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
 180 {
 181         ICONV_CONST char *ibuf;
 182         size_t icnt, ocnt, opos;
 183         char *obuf;
 184
 185         if (!out->size && flags & ICB_EXPAND_OUT) {
 186                 size_t siz = ROUND_UP_1024(in->len * 2);
 187                 alloc_xbuf(out, siz);
 188         } else if (out->len+1 >= out->size) {
 189                 /* There is no room to even start storing data. */
 190                 if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
 191                         errno = E2BIG;
 192                         return -1;
 193                 }
 194                 realloc_xbuf(out, out->size + ROUND_UP_1024(in->len * 2));
 195         }
 196
 197         if (flags & ICB_INIT)
 198                 iconv(ic, NULL, 0, NULL, 0);
 199
 200         ibuf = in->buf + in->pos;
 201         icnt = in->len;
 202
 203         opos = out->pos + out->len;
 204         if (flags & ICB_CIRCULAR_OUT) {
 205                 if (opos >= out->size) {
 206                         opos -= out->size;
 207                         /* We know that out->pos is not 0 due to the "no room" check
 208                          * above, so this can't go "negative". */
 209                         ocnt = out->pos - opos - 1;
 210                 } else {
 211                         /* Allow the use of all bytes to the physical end of the buffer
 212                          * unless pos is 0, in which case we reserve our trailing '\0'. */
 213                         ocnt = out->size - opos - (out->pos ? 0 : 1);
 214                 }
 215         } else
 216                 ocnt = out->size - opos - 1;
 217         obuf = out->buf + opos;
 218
 219         while (icnt) {
 220                 while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {
 221                         if (errno == EINTR)
 222                                 continue;
 223                         if (errno == EINVAL) {
 224                                 if (!(flags & ICB_INCLUDE_INCOMPLETE))
 225                                         goto finish;
 226                                 if (!ocnt)
 227                                         goto e2big;
 228                         } else if (errno == EILSEQ) {
 229                                 if (!(flags & ICB_INCLUDE_BAD))
 230                                         goto finish;
 231                                 if (!ocnt)
 232                                         goto e2big;
 233                         } else if (errno == E2BIG) {
 234                                 size_t siz;
 235                           e2big:
 236                                 opos = obuf - out->buf;
 237                                 if (flags & ICB_CIRCULAR_OUT && out->pos > 1 && opos > out->pos) {
 238                                         /* We are in a divided circular buffer at the physical
 239                                          * end with room to wrap to the start.  If iconv() refused
 240                                          * to use one or more trailing bytes in the buffer, we
 241                                          * set the size to ignore the unused bytes. */
 242                                         if (opos < out->size)
 243                                                 reduce_iobuf_size(out, opos);
 244                                         obuf = out->buf;
 245                                         ocnt = out->pos - 1;
 246                                         continue;
 247                                 }
 248                                 if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
 249                                         errno = E2BIG;
 250                                         goto finish;
 251                                 }
 252                                 siz = ROUND_UP_1024(in->len * 2);
 253                                 realloc_xbuf(out, out->size + siz);
 254                                 obuf = out->buf + opos;
 255                                 ocnt += siz;
 256                                 continue;
 257                         } else {
 258                                 rsyserr(FERROR, errno, "unexpected error from iconv()");
 259                                 exit_cleanup(RERR_UNSUPPORTED);
 260                         }
 261                         *obuf++ = *ibuf++;
 262                         ocnt--, icnt--;
 263                         if (!icnt)
 264                                 break;
 265                 }
 266         }
 267
 268         errno = 0;
 269
 270   finish:
 271         opos = obuf - out->buf;
 272         if (flags & ICB_CIRCULAR_OUT && opos < out->pos)
 273                 opos += out->size;
 274         out->len = opos - out->pos;
 275
 276         in->len = icnt;
 277         in->pos = ibuf - in->buf;
 278
 279         return errno ? -1 : 0;
 280 }
 281 #endif
 282
 283 void send_protected_args(int fd, char *args[])
 284 {
 285         int i;
 286 #ifdef ICONV_OPTION
 287         int convert = ic_send != (iconv_t)-1;
 288         xbuf outbuf, inbuf;
 289
 290         if (convert)
 291                 alloc_xbuf(&outbuf, 1024);
 292 #endif
 293
 294         for (i = 0; args[i]; i++) {} /* find first NULL */
 295         args[i] = "rsync"; /* set a new arg0 */
 296         if (DEBUG_GTE(CMD, 1))
 297                 print_child_argv("protected args:", args + i + 1);
 298         do {
 299                 if (!args[i][0])
 300                         write_buf(fd, ".", 2);
 301 #ifdef ICONV_OPTION
 302                 else if (convert) {
 303                         INIT_XBUF_STRLEN(inbuf, args[i]);
 304                         iconvbufs(ic_send, &inbuf, &outbuf,
 305                                   ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT);
 306                         outbuf.buf[outbuf.len] = '\0';
 307                         write_buf(fd, outbuf.buf, outbuf.len + 1);
 308                         outbuf.len = 0;
 309                 }
 310 #endif
 311                 else
 312                         write_buf(fd, args[i], strlen(args[i]) + 1);
 313         } while (args[++i]);
 314         write_byte(fd, 0);
 315
 316 #ifdef ICONV_OPTION
 317         if (convert)
 318                 free(outbuf.buf);
 319 #endif
 320 }
 321
 322 int read_ndx_and_attrs(int f_in, int f_out, int *iflag_ptr, uchar *type_ptr, char *buf, int *len_ptr)
 323 {
 324         int len, iflags = 0;
 325         struct file_list *flist;
 326         uchar fnamecmp_type = FNAMECMP_FNAME;
 327         int ndx;
 328
 329   read_loop:
 330         while (1) {
 331                 ndx = read_ndx(f_in);
 332
 333                 if (ndx >= 0)
 334                         break;
 335                 if (ndx == NDX_DONE)
 336                         return ndx;
 337                 if (ndx == NDX_DEL_STATS) {
 338                         read_del_stats(f_in);
 339                         if (am_sender && am_server)
 340                                 write_del_stats(f_out);
 341                         continue;
 342                 }
 343                 if (!inc_recurse || am_sender) {
 344                         int last;
 345                         if (first_flist)
 346                                 last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
 347                         else
 348                                 last = -1;
 349                         rprintf(FERROR,
 350                                 "Invalid file index: %d (%d - %d) [%s]\n",
 351                                 ndx, NDX_DONE, last, who_am_i());
 352                         exit_cleanup(RERR_PROTOCOL);
 353                 }
 354                 if (ndx == NDX_FLIST_EOF) {
 355                         flist_eof = 1;
 356                         if (DEBUG_GTE(FLIST, 3))
 357                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
 358                         write_int(f_out, NDX_FLIST_EOF);
 359                         continue;
 360                 }
 361                 ndx = NDX_FLIST_OFFSET - ndx;
 362                 if (ndx < 0 || ndx >= dir_flist->used) {
 363                         ndx = NDX_FLIST_OFFSET - ndx;
 364                         rprintf(FERROR,
 365                                 "Invalid dir index: %d (%d - %d) [%s]\n",
 366                                 ndx, NDX_FLIST_OFFSET,
 367                                 NDX_FLIST_OFFSET - dir_flist->used + 1,
 368                                 who_am_i());
 369                         exit_cleanup(RERR_PROTOCOL);
 370                 }
 371
 372                 if (DEBUG_GTE(FLIST, 2)) {
 373                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
 374                                 who_am_i(), ndx);
 375                 }
 376                 /* Send all the data we read for this flist to the generator. */
 377                 start_flist_forward(ndx);
 378                 flist = recv_file_list(f_in, ndx);
 379                 flist->parent_ndx = ndx;
 380                 stop_flist_forward();
 381         }
 382
 383         iflags = protocol_version >= 29 ? read_shortint(f_in)
 384                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 385
 386         /* Support the protocol-29 keep-alive style. */
 387         if (protocol_version < 30 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
 388                 if (am_sender)
 389                         maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH);
 390                 goto read_loop;
 391         }
 392
 393         flist = flist_for_ndx(ndx, "read_ndx_and_attrs");
 394         if (flist != cur_flist) {
 395                 cur_flist = flist;
 396                 if (am_sender) {
 397                         file_old_total = cur_flist->used;
 398                         for (flist = first_flist; flist != cur_flist; flist = flist->next)
 399                                 file_old_total += flist->used;
 400                 }
 401         }
 402
 403         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 404                 fnamecmp_type = read_byte(f_in);
 405         *type_ptr = fnamecmp_type;
 406
 407         if (iflags & ITEM_XNAME_FOLLOWS) {
 408                 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
 409                         exit_cleanup(RERR_PROTOCOL);
 410
 411                 if (sanitize_paths) {
 412                         sanitize_path(buf, buf, "", 0, SP_DEFAULT);
 413                         len = strlen(buf);
 414                 }
 415         } else {
 416                 *buf = '\0';
 417                 len = -1;
 418         }
 419         *len_ptr = len;
 420
 421         if (iflags & ITEM_TRANSFER) {
 422                 int i = ndx - cur_flist->ndx_start;
 423                 if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {
 424                         rprintf(FERROR,
 425                                 "received request to transfer non-regular file: %d [%s]\n",
 426                                 ndx, who_am_i());
 427                         exit_cleanup(RERR_PROTOCOL);
 428                 }
 429         }
 430
 431         *iflag_ptr = iflags;
 432         return ndx;
 433 }
 434
 435 /*
 436   free a sums struct
 437   */
 438 void free_sums(struct sum_struct *s)
 439 {
 440         if (s->sums) {
 441                 free(s->sums);
 442                 free(s->sum2_array);
 443         }
 444         free(s);
 445 }
 446
 447 /* This is only called when we aren't preserving permissions.  Figure out what
 448  * the permissions should be and return them merged back into the mode. */
 449 mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
 450                  int exists)
 451 {
 452         int new_mode;
 453         /* If the file already exists, we'll return the local permissions,
 454          * possibly tweaked by the --executability option. */
 455         if (exists) {
 456                 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
 457                 if (preserve_executability && S_ISREG(flist_mode)) {
 458                         /* If the source file is executable, grant execute
 459                          * rights to everyone who can read, but ONLY if the
 460                          * file isn't already executable. */
 461                         if (!(flist_mode & 0111))
 462                                 new_mode &= ~0111;
 463                         else if (!(stat_mode & 0111))
 464                                 new_mode |= (new_mode & 0444) >> 2;
 465                 }
 466         } else {
 467                 /* Apply destination default permissions and turn
 468                  * off special permissions. */
 469                 new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
 470         }
 471         return new_mode;
 472 }
 473
 474 static int same_mtime(struct file_struct *file, STRUCT_STAT *st, int extra_accuracy)
 475 {
 476 #ifdef ST_MTIME_NSEC
 477         uint32 f1_nsec = F_MOD_NSEC_or_0(file);
 478         uint32 f2_nsec = (uint32)st->ST_MTIME_NSEC;
 479 #else
 480         uint32 f1_nsec = 0, f2_nsec = 0;
 481 #endif
 482
 483         if (extra_accuracy) /* ignore modify_window when setting the time after a transfer or checksum check */
 484                 return file->modtime == st->st_mtime && f1_nsec == f2_nsec;
 485
 486         return same_time(file->modtime, f1_nsec, st->st_mtime , f2_nsec);
 487 }
 488
 489 int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
 490                    const char *fnamecmp, int flags)
 491 {
 492         int updated = 0;
 493         stat_x sx2;
 494         int change_uid, change_gid;
 495         mode_t new_mode = file->mode;
 496         int inherit;
 497
 498         if (!sxp) {
 499                 if (dry_run)
 500                         return 1;
 501                 if (link_stat(fname, &sx2.st, 0) < 0) {
 502                         rsyserr(FERROR_XFER, errno, "stat %s failed",
 503                                 full_fname(fname));
 504                         return 0;
 505                 }
 506                 init_stat_x(&sx2);
 507                 sxp = &sx2;
 508                 inherit = !preserve_perms;
 509         } else
 510                 inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;
 511
 512         if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
 513                 /* We just created this directory and its setgid
 514                  * bit is on, so make sure it stays on. */
 515                 new_mode |= S_ISGID;
 516         }
 517
 518         if (daemon_chmod_modes && !S_ISLNK(new_mode))
 519                 new_mode = tweak_mode(new_mode, daemon_chmod_modes);
 520
 521 #ifdef SUPPORT_ACLS
 522         if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
 523                 get_acl(fname, sxp);
 524 #endif
 525
 526         change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
 527         change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
 528                   && sxp->st.st_gid != (gid_t)F_GROUP(file);
 529 #ifndef CAN_CHOWN_SYMLINK
 530         if (S_ISLNK(sxp->st.st_mode)) {
 531                 ;
 532         } else
 533 #endif
 534         if (change_uid || change_gid) {
 535                 if (DEBUG_GTE(OWN, 1)) {
 536                         if (change_uid) {
 537                                 rprintf(FINFO,
 538                                         "set uid of %s from %u to %u\n",
 539                                         fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
 540                         }
 541                         if (change_gid) {
 542                                 rprintf(FINFO,
 543                                         "set gid of %s from %u to %u\n",
 544                                         fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
 545                         }
 546                 }
 547                 if (am_root >= 0) {
 548                         uid_t uid = change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid;
 549                         gid_t gid = change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid;
 550                         if (do_lchown(fname, uid, gid) != 0) {
 551                                 /* We shouldn't have attempted to change uid
 552                                  * or gid unless have the privilege. */
 553                                 rsyserr(FERROR_XFER, errno, "%s %s failed",
 554                                         change_uid ? "chown" : "chgrp",
 555                                         full_fname(fname));
 556                                 goto cleanup;
 557                         }
 558                         if (uid == (uid_t)-1 && sxp->st.st_uid != (uid_t)-1)
 559                                 rprintf(FERROR_XFER, "uid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 560                         if (gid == (gid_t)-1 && sxp->st.st_gid != (gid_t)-1)
 561                                 rprintf(FERROR_XFER, "gid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 562                         /* A lchown had been done, so we need to re-stat if
 563                          * the destination had the setuid or setgid bits set
 564                          * (due to the side effect of the chown call). */
 565                         if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
 566                                 link_stat(fname, &sxp->st,
 567                                           keep_dirlinks && S_ISDIR(sxp->st.st_mode));
 568                         }
 569                 }
 570                 if (change_uid)
 571                         updated |= UPDATED_OWNER;
 572                 if (change_gid)
 573                         updated |= UPDATED_GROUP;
 574         }
 575
 576 #ifdef SUPPORT_XATTRS
 577         if (am_root < 0)
 578                 set_stat_xattr(fname, file, new_mode);
 579         if (preserve_xattrs && fnamecmp)
 580                 set_xattr(fname, file, fnamecmp, sxp);
 581 #endif
 582
 583         if ((omit_dir_times && S_ISDIR(sxp->st.st_mode))
 584          || (omit_link_times && S_ISLNK(sxp->st.st_mode)))
 585                 flags |= ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME | ATTRS_SKIP_CRTIME;
 586         else {
 587                 if (!preserve_mtimes)
 588                         flags |= ATTRS_SKIP_MTIME;
 589                 if (!atimes_ndx || S_ISDIR(sxp->st.st_mode))
 590                         flags |= ATTRS_SKIP_ATIME;
 591                 /* Don't set the creation date on the root folder of an HFS+ volume. */
 592                 if (sxp->st.st_ino == 2 && S_ISDIR(sxp->st.st_mode))
 593                         flags |= ATTRS_SKIP_CRTIME;
 594         }
 595         if (sxp != &sx2)
 596                 memcpy(&sx2.st, &sxp->st, sizeof sx2.st);
 597         if (!(flags & ATTRS_SKIP_MTIME) && !same_mtime(file, &sxp->st, flags & ATTRS_ACCURATE_TIME)) {
 598                 sx2.st.st_mtime = file->modtime;
 599 #ifdef ST_MTIME_NSEC
 600                 sx2.st.ST_MTIME_NSEC = F_MOD_NSEC_or_0(file);
 601 #endif
 602                 updated |= UPDATED_MTIME;
 603         }
 604         if (!(flags & ATTRS_SKIP_ATIME)) {
 605                 time_t file_atime = F_ATIME(file);
 606                 if (flags & ATTRS_ACCURATE_TIME || !same_time(sxp->st.st_atime, 0, file_atime, 0)) {
 607                         sx2.st.st_atime = file_atime;
 608 #ifdef ST_ATIME_NSEC
 609                         sx2.st.ST_ATIME_NSEC = 0;
 610 #endif
 611                         updated |= UPDATED_ATIME;
 612                 }
 613         }
 614 #ifdef SUPPORT_CRTIMES
 615         if (crtimes_ndx && !(flags & ATTRS_SKIP_CRTIME)) {
 616                 time_t file_crtime = F_CRTIME(file);
 617                 if (sxp->crtime == 0)
 618                         sxp->crtime = get_create_time(fname, &sxp->st);
 619                 if (!same_time(sxp->crtime, 0L, file_crtime, 0L)) {
 620                         if (
 621 #ifdef HAVE_GETATTRLIST
 622                              do_setattrlist_crtime(fname, file_crtime) == 0
 623 #elif defined __CYGWIN__
 624                              do_SetFileTime(fname, file_crtime) == 0
 625 #else
 626 #error Unknown crtimes implementation
 627 #endif
 628                         )
 629                                 updated |= UPDATED_CRTIME;
 630                 }
 631         }
 632 #endif
 633         if (updated & (UPDATED_MTIME|UPDATED_ATIME)) {
 634                 int ret = set_times(fname, &sx2.st);
 635                 if (ret < 0) {
 636                         rsyserr(FERROR_XFER, errno, "failed to set times on %s", full_fname(fname));
 637                         goto cleanup;
 638                 }
 639                 if (ret > 0) { /* ret == 1 if symlink could not be set */
 640                         updated &= ~(UPDATED_MTIME|UPDATED_ATIME);
 641                         file->flags |= FLAG_TIME_FAILED;
 642                 }
 643         }
 644
 645 #ifdef SUPPORT_ACLS
 646         /* It's OK to call set_acl() now, even for a dir, as the generator
 647          * will enable owner-writability using chmod, if necessary.
 648          *
 649          * If set_acl() changes permission bits in the process of setting
 650          * an access ACL, it changes sxp->st.st_mode so we know whether we
 651          * need to chmod(). */
 652         if (preserve_acls && !S_ISLNK(new_mode)) {
 653                 if (set_acl(fname, file, sxp, new_mode) > 0)
 654                         updated |= UPDATED_ACLS;
 655         }
 656 #endif
 657
 658 #ifdef HAVE_CHMOD
 659         if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
 660                 int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
 661                 if (ret < 0) {
 662                         rsyserr(FERROR_XFER, errno,
 663                                 "failed to set permissions on %s",
 664                                 full_fname(fname));
 665                         goto cleanup;
 666                 }
 667                 if (ret == 0) /* ret == 1 if symlink could not be set */
 668                         updated |= UPDATED_MODE;
 669         }
 670 #endif
 671
 672         if (INFO_GTE(NAME, 2) && flags & ATTRS_REPORT) {
 673                 if (updated)
 674                         rprintf(FCLIENT, "%s\n", fname);
 675                 else
 676                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 677         }
 678   cleanup:
 679         if (sxp == &sx2)
 680                 free_stat_x(&sx2);
 681         return updated;
 682 }
 683
 684 /* This is only called for SIGINT, SIGHUP, and SIGTERM. */
 685 void sig_int(int sig_num)
 686 {
 687         called_from_signal_handler = 1;
 688
 689         /* KLUGE: if the user hits Ctrl-C while ssh is prompting
 690          * for a password, then our cleanup's sending of a SIGUSR1
 691          * signal to all our children may kill ssh before it has a
 692          * chance to restore the tty settings (i.e. turn echo back
 693          * on).  By sleeping for a short time, ssh gets a bigger
 694          * chance to do the right thing.  If child processes are
 695          * not ssh waiting for a password, then this tiny delay
 696          * shouldn't hurt anything. */
 697         msleep(400);
 698
 699         /* If we're an rsync daemon listener (not a daemon server),
 700          * we'll exit with status 0 if we received SIGTERM. */
 701         if (am_daemon && !am_server && sig_num == SIGTERM)
 702                 exit_cleanup(0);
 703
 704         /* If the signal arrived on the server side (or for the receiver
 705          * process on the client), we want to try to do a controlled shutdown
 706          * that lets the client side (generator process) know what happened.
 707          * To do this, we set a flag and let the normal process handle the
 708          * shutdown.  We only attempt this if multiplexed IO is in effect and
 709          * we didn't already set the flag. */
 710         if (!got_kill_signal && (am_server || am_receiver)) {
 711                 got_kill_signal = sig_num;
 712                 called_from_signal_handler = 0;
 713                 return;
 714         }
 715
 716         exit_cleanup(RERR_SIGNAL);
 717 }
 718
 719 /* Finish off a file transfer: renaming the file and setting the file's
 720  * attributes (e.g. permissions, ownership, etc.).  If the robust_rename()
 721  * call is forced to copy the temp file and partialptr is both non-NULL and
 722  * not an absolute path, we stage the file into the partial-dir and then
 723  * rename it into place.  This returns 1 on success or 0 on failure. */
 724 int finish_transfer(const char *fname, const char *fnametmp,
 725                     const char *fnamecmp, const char *partialptr,
 726                     struct file_struct *file, int ok_to_set_time,
 727                     int overwriting_basis)
 728 {
 729         int ret;
 730         const char *temp_copy_name = partialptr && *partialptr != '/' ? partialptr : NULL;
 731
 732         if (inplace) {
 733                 if (DEBUG_GTE(RECV, 1))
 734                         rprintf(FINFO, "finishing %s\n", fname);
 735                 fnametmp = fname;
 736                 goto do_set_file_attrs;
 737         }
 738
 739         if (make_backups > 0 && overwriting_basis) {
 740                 int ok = make_backup(fname, False);
 741                 if (!ok)
 742                         exit_cleanup(RERR_FILEIO);
 743                 if (ok == 1 && fnamecmp == fname)
 744                         fnamecmp = get_backup_name(fname);
 745         }
 746
 747         /* Change permissions before putting the file into place. */
 748         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 749                        ok_to_set_time ? ATTRS_ACCURATE_TIME : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME | ATTRS_SKIP_CRTIME);
 750
 751         /* move tmp file over real file */
 752         if (DEBUG_GTE(RECV, 1))
 753                 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
 754         ret = robust_rename(fnametmp, fname, temp_copy_name, file->mode);
 755         if (ret < 0) {
 756                 rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"",
 757                         ret == -2 ? "copy" : "rename",
 758                         full_fname(fnametmp), fname);
 759                 if (!partialptr || (ret == -2 && temp_copy_name)
 760                  || robust_rename(fnametmp, partialptr, NULL, file->mode) < 0)
 761                         do_unlink(fnametmp);
 762                 return 0;
 763         }
 764         if (ret == 0) {
 765                 /* The file was moved into place (not copied), so it's done. */
 766                 return 1;
 767         }
 768         /* The file was copied, so tweak the perms of the copied file.  If it
 769          * was copied to partialptr, move it into its final destination. */
 770         fnametmp = temp_copy_name ? temp_copy_name : fname;
 771
 772   do_set_file_attrs:
 773         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 774                        ok_to_set_time ? ATTRS_ACCURATE_TIME : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME | ATTRS_SKIP_CRTIME);
 775
 776         if (temp_copy_name) {
 777                 if (do_rename(fnametmp, fname) < 0) {
 778                         rsyserr(FERROR_XFER, errno, "rename %s -> \"%s\"",
 779                                 full_fname(fnametmp), fname);
 780                         return 0;
 781                 }
 782                 handle_partial_dir(temp_copy_name, PDIR_DELETE);
 783         }
 784         return 1;
 785 }
 786
 787 struct file_list *flist_for_ndx(int ndx, const char *fatal_error_loc)
 788 {
 789         struct file_list *flist = cur_flist;
 790
 791         if (!flist && !(flist = first_flist))
 792                 goto not_found;
 793
 794         while (ndx < flist->ndx_start-1) {
 795                 if (flist == first_flist)
 796                         goto not_found;
 797                 flist = flist->prev;
 798         }
 799         while (ndx >= flist->ndx_start + flist->used) {
 800                 if (!(flist = flist->next))
 801                         goto not_found;
 802         }
 803         return flist;
 804
 805   not_found:
 806         if (fatal_error_loc) {
 807                 int first, last;
 808                 if (first_flist) {
 809                         first = first_flist->ndx_start - 1;
 810                         last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
 811                 } else {
 812                         first = 0;
 813                         last = -1;
 814                 }
 815                 rprintf(FERROR,
 816                         "File-list index %d not in %d - %d (%s) [%s]\n",
 817                         ndx, first, last, fatal_error_loc, who_am_i());
 818                 exit_cleanup(RERR_PROTOCOL);
 819         }
 820         return NULL;
 821 }
 822
 823 const char *who_am_i(void)
 824 {
 825         if (am_starting_up)
 826                 return am_server ? "server" : "client";
 827         return am_sender ? "sender"
 828              : am_generator ? "generator"
 829              : am_receiver ? "receiver"
 830              : "Receiver"; /* pre-forked receiver */
 831 }