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) 2003-2020 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_times;
  36 extern int am_root;
  37 extern int am_server;
  38 extern int am_daemon;
  39 extern int am_sender;
  40 extern int am_receiver;
  41 extern int am_generator;
  42 extern int am_starting_up;
  43 extern int allow_8bit_chars;
  44 extern int protocol_version;
  45 extern int got_kill_signal;
  46 extern int called_from_signal_handler;
  47 extern int inc_recurse;
  48 extern int inplace;
  49 extern int flist_eof;
  50 extern int file_old_total;
  51 extern int keep_dirlinks;
  52 extern int make_backups;
  53 extern int sanitize_paths;
  54 extern struct file_list *cur_flist, *first_flist, *dir_flist;
  55 extern struct chmod_mode_struct *daemon_chmod_modes;
  56 #ifdef ICONV_OPTION
  57 extern char *iconv_opt;
  58 #endif
  59
  60 #define UPDATED_OWNER (1<<0)
  61 #define UPDATED_GROUP (1<<1)
  62 #define UPDATED_MTIME (1<<2)
  63 #define UPDATED_ATIME (1<<3)
  64 #define UPDATED_ACLS  (1<<4)
  65 #define UPDATED_MODE  (1<<5)
  66
  67 #define UPDATED_TIMES (UPDATED_MTIME|UPDATED_ATIME)
  68
  69 #ifdef ICONV_CONST
  70 iconv_t ic_chck = (iconv_t)-1;
  71 # ifdef ICONV_OPTION
  72 iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
  73 # endif
  74
  75 static const char *default_charset(void)
  76 {
  77 # if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
  78         return locale_charset();
  79 # elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
  80         return nl_langinfo(CODESET);
  81 # else
  82         return ""; /* Works with (at the very least) gnu iconv... */
  83 # endif
  84 }
  85
  86 void setup_iconv(void)
  87 {
  88         const char *defset = default_charset();
  89 # ifdef ICONV_OPTION
  90         const char *charset;
  91         char *cp;
  92 # endif
  93
  94         if (!am_server && !allow_8bit_chars) {
  95                 /* It's OK if this fails... */
  96                 ic_chck = iconv_open(defset, defset);
  97
  98                 if (DEBUG_GTE(ICONV, 2)) {
  99                         if (ic_chck == (iconv_t)-1) {
 100                                 rprintf(FINFO,
 101                                         "msg checking via isprint()"
 102                                         " (iconv_open(\"%s\", \"%s\") errno: %d)\n",
 103                                         defset, defset, errno);
 104                         } else {
 105                                 rprintf(FINFO,
 106                                         "msg checking charset: %s\n",
 107                                         defset);
 108                         }
 109                 }
 110         } else
 111                 ic_chck = (iconv_t)-1;
 112
 113 # ifdef ICONV_OPTION
 114         if (!iconv_opt)
 115                 return;
 116
 117         if ((cp = strchr(iconv_opt, ',')) != NULL) {
 118                 if (am_server) /* A local transfer needs this. */
 119                         iconv_opt = cp + 1;
 120                 else
 121                         *cp = '\0';
 122         }
 123
 124         if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))
 125                 charset = defset;
 126         else
 127                 charset = iconv_opt;
 128
 129         if ((ic_send = iconv_open(UTF8_CHARSET, charset)) == (iconv_t)-1) {
 130                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 131                         UTF8_CHARSET, charset);
 132                 exit_cleanup(RERR_UNSUPPORTED);
 133         }
 134
 135         if ((ic_recv = iconv_open(charset, UTF8_CHARSET)) == (iconv_t)-1) {
 136                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 137                         charset, UTF8_CHARSET);
 138                 exit_cleanup(RERR_UNSUPPORTED);
 139         }
 140
 141         if (DEBUG_GTE(ICONV, 1)) {
 142                 rprintf(FINFO, "[%s] charset: %s\n",
 143                         who_am_i(), *charset ? charset : "[LOCALE]");
 144         }
 145 # endif
 146 }
 147
 148 /* This function converts the chars in the "in" xbuf into characters in the
 149  * "out" xbuf.  The ".len" chars of the "in" xbuf is used starting from its
 150  * ".pos".  The ".size" of the "out" xbuf restricts how many characters can
 151  * be stored, starting at its ".pos+.len" position.  Note that the last byte
 152  * of the "out" xbuf is not used, which reserves space for a trailing '\0'
 153  * (though it is up to the caller to store a trailing '\0', as needed).
 154  *
 155  * We return a 0 on success or a -1 on error.  An error also sets errno to
 156  * E2BIG, EILSEQ, or EINVAL (see below); otherwise errno will be set to 0.
 157  * The "in" xbuf is altered to update ".pos" and ".len".  The "out" xbuf has
 158  * data appended, and its ".len" incremented (see below for a ".size" note).
 159  *
 160  * If ICB_CIRCULAR_OUT is set in "flags", the chars going into the "out" xbuf
 161  * can wrap around to the start, and the xbuf may have its ".size" reduced
 162  * (presumably by 1 byte) if the iconv code doesn't have space to store a
 163  * multi-byte character at the physical end of the ".buf" (though no reducing
 164  * happens if ".pos" is <= 1, since there is no room to wrap around).
 165  *
 166  * If ICB_EXPAND_OUT is set in "flags", the "out" xbuf will be allocated if
 167  * empty, and (as long as ICB_CIRCULAR_OUT is not set) expanded if too small.
 168  * This prevents the return of E2BIG (except for a circular xbuf).
 169  *
 170  * If ICB_INCLUDE_BAD is set in "flags", any badly-encoded chars are included
 171  * verbatim in the "out" xbuf, so EILSEQ will not be returned.
 172  *
 173  * If ICB_INCLUDE_INCOMPLETE is set in "flags", any incomplete multi-byte
 174  * chars are included, which ensures that EINVAL is not returned.
 175  *
 176  * If ICB_INIT is set, the iconv() conversion state is initialized prior to
 177  * processing the characters. */
 178 int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
 179 {
 180         ICONV_CONST char *ibuf;
 181         size_t icnt, ocnt, opos;
 182         char *obuf;
 183
 184         if (!out->size && flags & ICB_EXPAND_OUT) {
 185                 size_t siz = ROUND_UP_1024(in->len * 2);
 186                 alloc_xbuf(out, siz);
 187         } else if (out->len+1 >= out->size) {
 188                 /* There is no room to even start storing data. */
 189                 if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
 190                         errno = E2BIG;
 191                         return -1;
 192                 }
 193                 realloc_xbuf(out, out->size + ROUND_UP_1024(in->len * 2));
 194         }
 195
 196         if (flags & ICB_INIT)
 197                 iconv(ic, NULL, 0, NULL, 0);
 198
 199         ibuf = in->buf + in->pos;
 200         icnt = in->len;
 201
 202         opos = out->pos + out->len;
 203         if (flags & ICB_CIRCULAR_OUT) {
 204                 if (opos >= out->size) {
 205                         opos -= out->size;
 206                         /* We know that out->pos is not 0 due to the "no room" check
 207                          * above, so this can't go "negative". */
 208                         ocnt = out->pos - opos - 1;
 209                 } else {
 210                         /* Allow the use of all bytes to the physical end of the buffer
 211                          * unless pos is 0, in which case we reserve our trailing '\0'. */
 212                         ocnt = out->size - opos - (out->pos ? 0 : 1);
 213                 }
 214         } else
 215                 ocnt = out->size - opos - 1;
 216         obuf = out->buf + opos;
 217
 218         while (icnt) {
 219                 while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {
 220                         if (errno == EINTR)
 221                                 continue;
 222                         if (errno == EINVAL) {
 223                                 if (!(flags & ICB_INCLUDE_INCOMPLETE))
 224                                         goto finish;
 225                                 if (!ocnt)
 226                                         goto e2big;
 227                         } else if (errno == EILSEQ) {
 228                                 if (!(flags & ICB_INCLUDE_BAD))
 229                                         goto finish;
 230                                 if (!ocnt)
 231                                         goto e2big;
 232                         } else if (errno == E2BIG) {
 233                                 size_t siz;
 234                           e2big:
 235                                 opos = obuf - out->buf;
 236                                 if (flags & ICB_CIRCULAR_OUT && out->pos > 1 && opos > out->pos) {
 237                                         /* We are in a divided circular buffer at the physical
 238                                          * end with room to wrap to the start.  If iconv() refused
 239                                          * to use one or more trailing bytes in the buffer, we
 240                                          * set the size to ignore the unused bytes. */
 241                                         if (opos < out->size)
 242                                                 reduce_iobuf_size(out, opos);
 243                                         obuf = out->buf;
 244                                         ocnt = out->pos - 1;
 245                                         continue;
 246                                 }
 247                                 if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
 248                                         errno = E2BIG;
 249                                         goto finish;
 250                                 }
 251                                 siz = ROUND_UP_1024(in->len * 2);
 252                                 realloc_xbuf(out, out->size + siz);
 253                                 obuf = out->buf + opos;
 254                                 ocnt += siz;
 255                                 continue;
 256                         } else {
 257                                 rsyserr(FERROR, errno, "unexpected error from iconv()");
 258                                 exit_cleanup(RERR_UNSUPPORTED);
 259                         }
 260                         *obuf++ = *ibuf++;
 261                         ocnt--, icnt--;
 262                         if (!icnt)
 263                                 break;
 264                 }
 265         }
 266
 267         errno = 0;
 268
 269   finish:
 270         opos = obuf - out->buf;
 271         if (flags & ICB_CIRCULAR_OUT && opos < out->pos)
 272                 opos += out->size;
 273         out->len = opos - out->pos;
 274
 275         in->len = icnt;
 276         in->pos = ibuf - in->buf;
 277
 278         return errno ? -1 : 0;
 279 }
 280 #endif
 281
 282 void send_protected_args(int fd, char *args[])
 283 {
 284         int i;
 285 #ifdef ICONV_OPTION
 286         int convert = ic_send != (iconv_t)-1;
 287         xbuf outbuf, inbuf;
 288
 289         if (convert)
 290                 alloc_xbuf(&outbuf, 1024);
 291 #endif
 292
 293         for (i = 0; args[i]; i++) {} /* find first NULL */
 294         args[i] = "rsync"; /* set a new arg0 */
 295         if (DEBUG_GTE(CMD, 1))
 296                 print_child_argv("protected args:", args + i + 1);
 297         do {
 298                 if (!args[i][0])
 299                         write_buf(fd, ".", 2);
 300 #ifdef ICONV_OPTION
 301                 else if (convert) {
 302                         INIT_XBUF_STRLEN(inbuf, args[i]);
 303                         iconvbufs(ic_send, &inbuf, &outbuf,
 304                                   ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT);
 305                         outbuf.buf[outbuf.len] = '\0';
 306                         write_buf(fd, outbuf.buf, outbuf.len + 1);
 307                         outbuf.len = 0;
 308                 }
 309 #endif
 310                 else
 311                         write_buf(fd, args[i], strlen(args[i]) + 1);
 312         } while (args[++i]);
 313         write_byte(fd, 0);
 314
 315 #ifdef ICONV_OPTION
 316         if (convert)
 317                 free(outbuf.buf);
 318 #endif
 319 }
 320
 321 int read_ndx_and_attrs(int f_in, int f_out, int *iflag_ptr, uchar *type_ptr, char *buf, int *len_ptr)
 322 {
 323         int len, iflags = 0;
 324         struct file_list *flist;
 325         uchar fnamecmp_type = FNAMECMP_FNAME;
 326         int ndx;
 327
 328   read_loop:
 329         while (1) {
 330                 ndx = read_ndx(f_in);
 331
 332                 if (ndx >= 0)
 333                         break;
 334                 if (ndx == NDX_DONE)
 335                         return ndx;
 336                 if (ndx == NDX_DEL_STATS) {
 337                         read_del_stats(f_in);
 338                         if (am_sender && am_server)
 339                                 write_del_stats(f_out);
 340                         continue;
 341                 }
 342                 if (!inc_recurse || am_sender) {
 343                         int last;
 344                         if (first_flist)
 345                                 last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
 346                         else
 347                                 last = -1;
 348                         rprintf(FERROR,
 349                                 "Invalid file index: %d (%d - %d) [%s]\n",
 350                                 ndx, NDX_DONE, last, who_am_i());
 351                         exit_cleanup(RERR_PROTOCOL);
 352                 }
 353                 if (ndx == NDX_FLIST_EOF) {
 354                         flist_eof = 1;
 355                         if (DEBUG_GTE(FLIST, 3))
 356                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
 357                         write_int(f_out, NDX_FLIST_EOF);
 358                         continue;
 359                 }
 360                 ndx = NDX_FLIST_OFFSET - ndx;
 361                 if (ndx < 0 || ndx >= dir_flist->used) {
 362                         ndx = NDX_FLIST_OFFSET - ndx;
 363                         rprintf(FERROR,
 364                                 "Invalid dir index: %d (%d - %d) [%s]\n",
 365                                 ndx, NDX_FLIST_OFFSET,
 366                                 NDX_FLIST_OFFSET - dir_flist->used + 1,
 367                                 who_am_i());
 368                         exit_cleanup(RERR_PROTOCOL);
 369                 }
 370
 371                 if (DEBUG_GTE(FLIST, 2)) {
 372                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
 373                                 who_am_i(), ndx);
 374                 }
 375                 /* Send all the data we read for this flist to the generator. */
 376                 start_flist_forward(ndx);
 377                 flist = recv_file_list(f_in, ndx);
 378                 flist->parent_ndx = ndx;
 379                 stop_flist_forward();
 380         }
 381
 382         iflags = protocol_version >= 29 ? read_shortint(f_in)
 383                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 384
 385         /* Support the protocol-29 keep-alive style. */
 386         if (protocol_version < 30 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
 387                 if (am_sender)
 388                         maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH);
 389                 goto read_loop;
 390         }
 391
 392         flist = flist_for_ndx(ndx, "read_ndx_and_attrs");
 393         if (flist != cur_flist) {
 394                 cur_flist = flist;
 395                 if (am_sender) {
 396                         file_old_total = cur_flist->used;
 397                         for (flist = first_flist; flist != cur_flist; flist = flist->next)
 398                                 file_old_total += flist->used;
 399                 }
 400         }
 401
 402         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 403                 fnamecmp_type = read_byte(f_in);
 404         *type_ptr = fnamecmp_type;
 405
 406         if (iflags & ITEM_XNAME_FOLLOWS) {
 407                 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
 408                         exit_cleanup(RERR_PROTOCOL);
 409
 410                 if (sanitize_paths) {
 411                         sanitize_path(buf, buf, "", 0, SP_DEFAULT);
 412                         len = strlen(buf);
 413                 }
 414         } else {
 415                 *buf = '\0';
 416                 len = -1;
 417         }
 418         *len_ptr = len;
 419
 420         if (iflags & ITEM_TRANSFER) {
 421                 int i = ndx - cur_flist->ndx_start;
 422                 if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {
 423                         rprintf(FERROR,
 424                                 "received request to transfer non-regular file: %d [%s]\n",
 425                                 ndx, who_am_i());
 426                         exit_cleanup(RERR_PROTOCOL);
 427                 }
 428         }
 429
 430         *iflag_ptr = iflags;
 431         return ndx;
 432 }
 433
 434 /*
 435   free a sums struct
 436   */
 437 void free_sums(struct sum_struct *s)
 438 {
 439         if (s->sums) free(s->sums);
 440         free(s);
 441 }
 442
 443 /* This is only called when we aren't preserving permissions.  Figure out what
 444  * the permissions should be and return them merged back into the mode. */
 445 mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
 446                  int exists)
 447 {
 448         int new_mode;
 449         /* If the file already exists, we'll return the local permissions,
 450          * possibly tweaked by the --executability option. */
 451         if (exists) {
 452                 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
 453                 if (preserve_executability && S_ISREG(flist_mode)) {
 454                         /* If the source file is executable, grant execute
 455                          * rights to everyone who can read, but ONLY if the
 456                          * file isn't already executable. */
 457                         if (!(flist_mode & 0111))
 458                                 new_mode &= ~0111;
 459                         else if (!(stat_mode & 0111))
 460                                 new_mode |= (new_mode & 0444) >> 2;
 461                 }
 462         } else {
 463                 /* Apply destination default permissions and turn
 464                  * off special permissions. */
 465                 new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
 466         }
 467         return new_mode;
 468 }
 469
 470 static int same_mtime(struct file_struct *file, STRUCT_STAT *st, int extra_accuracy)
 471 {
 472 #ifdef ST_MTIME_NSEC
 473         uint32 f1_nsec = F_MOD_NSEC_or_0(file);
 474         uint32 f2_nsec = (uint32)st->ST_MTIME_NSEC;
 475 #else
 476         uint32 f1_nsec = 0, f2_nsec = 0;
 477 #endif
 478
 479         if (extra_accuracy) /* ignore modify_window when setting the time after a transfer or checksum check */
 480                 return file->modtime == st->st_mtime && f1_nsec == f2_nsec;
 481
 482         return same_time(file->modtime, f1_nsec, st->st_mtime , f2_nsec);
 483 }
 484
 485 int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
 486                    const char *fnamecmp, int flags)
 487 {
 488         int updated = 0;
 489         stat_x sx2;
 490         int change_uid, change_gid;
 491         mode_t new_mode = file->mode;
 492         int inherit;
 493
 494         if (!sxp) {
 495                 if (dry_run)
 496                         return 1;
 497                 if (link_stat(fname, &sx2.st, 0) < 0) {
 498                         rsyserr(FERROR_XFER, errno, "stat %s failed",
 499                                 full_fname(fname));
 500                         return 0;
 501                 }
 502                 init_stat_x(&sx2);
 503                 sxp = &sx2;
 504                 inherit = !preserve_perms;
 505         } else
 506                 inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;
 507
 508         if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
 509                 /* We just created this directory and its setgid
 510                  * bit is on, so make sure it stays on. */
 511                 new_mode |= S_ISGID;
 512         }
 513
 514         if (daemon_chmod_modes && !S_ISLNK(new_mode))
 515                 new_mode = tweak_mode(new_mode, daemon_chmod_modes);
 516
 517 #ifdef SUPPORT_ACLS
 518         if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
 519                 get_acl(fname, sxp);
 520 #endif
 521
 522         change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
 523         change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
 524                   && sxp->st.st_gid != (gid_t)F_GROUP(file);
 525 #ifndef CAN_CHOWN_SYMLINK
 526         if (S_ISLNK(sxp->st.st_mode)) {
 527                 ;
 528         } else
 529 #endif
 530         if (change_uid || change_gid) {
 531                 if (DEBUG_GTE(OWN, 1)) {
 532                         if (change_uid) {
 533                                 rprintf(FINFO,
 534                                         "set uid of %s from %u to %u\n",
 535                                         fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
 536                         }
 537                         if (change_gid) {
 538                                 rprintf(FINFO,
 539                                         "set gid of %s from %u to %u\n",
 540                                         fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
 541                         }
 542                 }
 543                 if (am_root >= 0) {
 544                         uid_t uid = change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid;
 545                         gid_t gid = change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid;
 546                         if (do_lchown(fname, uid, gid) != 0) {
 547                                 /* We shouldn't have attempted to change uid
 548                                  * or gid unless have the privilege. */
 549                                 rsyserr(FERROR_XFER, errno, "%s %s failed",
 550                                         change_uid ? "chown" : "chgrp",
 551                                         full_fname(fname));
 552                                 goto cleanup;
 553                         }
 554                         if (uid == (uid_t)-1 && sxp->st.st_uid != (uid_t)-1)
 555                                 rprintf(FERROR_XFER, "uid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 556                         if (gid == (gid_t)-1 && sxp->st.st_gid != (gid_t)-1)
 557                                 rprintf(FERROR_XFER, "gid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 558                         /* A lchown had been done, so we need to re-stat if
 559                          * the destination had the setuid or setgid bits set
 560                          * (due to the side effect of the chown call). */
 561                         if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
 562                                 link_stat(fname, &sxp->st,
 563                                           keep_dirlinks && S_ISDIR(sxp->st.st_mode));
 564                         }
 565                 }
 566                 if (change_uid)
 567                         updated |= UPDATED_OWNER;
 568                 if (change_gid)
 569                         updated |= UPDATED_GROUP;
 570         }
 571
 572 #ifdef SUPPORT_XATTRS
 573         if (am_root < 0)
 574                 set_stat_xattr(fname, file, new_mode);
 575         if (preserve_xattrs && fnamecmp)
 576                 set_xattr(fname, file, fnamecmp, sxp);
 577 #endif
 578
 579         if (!preserve_times
 580          || (!(preserve_times & PRESERVE_DIR_TIMES) && S_ISDIR(sxp->st.st_mode))
 581          || (!(preserve_times & PRESERVE_LINK_TIMES) && S_ISLNK(sxp->st.st_mode)))
 582                 flags |= ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME;
 583         else if (sxp != &sx2)
 584                 memcpy(&sx2.st, &sxp->st, sizeof (sx2.st));
 585         if (!atimes_ndx || S_ISDIR(sxp->st.st_mode))
 586                 flags |= ATTRS_SKIP_ATIME;
 587         if (!(flags & ATTRS_SKIP_MTIME) && !same_mtime(file, &sxp->st, flags & ATTRS_ACCURATE_TIME)) {
 588                 sx2.st.st_mtime = file->modtime;
 589 #ifdef ST_MTIME_NSEC
 590                 sx2.st.ST_MTIME_NSEC = F_MOD_NSEC_or_0(file);
 591 #endif
 592                 updated |= UPDATED_MTIME;
 593         }
 594         if (!(flags & ATTRS_SKIP_ATIME)) {
 595                 time_t file_atime = F_ATIME(file);
 596                 if (flags & ATTRS_ACCURATE_TIME || !same_time(sxp->st.st_atime, 0, file_atime, 0)) {
 597                         sx2.st.st_atime = file_atime;
 598 #ifdef ST_ATIME_NSEC
 599                         sx2.st.ST_ATIME_NSEC = 0;
 600 #endif
 601                         updated |= UPDATED_ATIME;
 602                 }
 603         }
 604         if (updated & UPDATED_TIMES) {
 605                 int ret = set_times(fname, &sx2.st);
 606                 if (ret < 0) {
 607                         rsyserr(FERROR_XFER, errno, "failed to set times on %s",
 608                                 full_fname(fname));
 609                         goto cleanup;
 610                 }
 611                 if (ret > 0) { /* ret == 1 if symlink could not be set */
 612                         updated &= ~UPDATED_TIMES;
 613                         file->flags |= FLAG_TIME_FAILED;
 614                 }
 615         }
 616
 617 #ifdef SUPPORT_ACLS
 618         /* It's OK to call set_acl() now, even for a dir, as the generator
 619          * will enable owner-writability using chmod, if necessary.
 620          *
 621          * If set_acl() changes permission bits in the process of setting
 622          * an access ACL, it changes sxp->st.st_mode so we know whether we
 623          * need to chmod(). */
 624         if (preserve_acls && !S_ISLNK(new_mode)) {
 625                 if (set_acl(fname, file, sxp, new_mode) > 0)
 626                         updated |= UPDATED_ACLS;
 627         }
 628 #endif
 629
 630 #ifdef HAVE_CHMOD
 631         if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
 632                 int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
 633                 if (ret < 0) {
 634                         rsyserr(FERROR_XFER, errno,
 635                                 "failed to set permissions on %s",
 636                                 full_fname(fname));
 637                         goto cleanup;
 638                 }
 639                 if (ret == 0) /* ret == 1 if symlink could not be set */
 640                         updated |= UPDATED_MODE;
 641         }
 642 #endif
 643
 644         if (INFO_GTE(NAME, 2) && flags & ATTRS_REPORT) {
 645                 if (updated)
 646                         rprintf(FCLIENT, "%s\n", fname);
 647                 else
 648                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 649         }
 650   cleanup:
 651         if (sxp == &sx2)
 652                 free_stat_x(&sx2);
 653         return updated;
 654 }
 655
 656 /* This is only called for SIGINT, SIGHUP, and SIGTERM. */
 657 void sig_int(int sig_num)
 658 {
 659         called_from_signal_handler = 1;
 660
 661         /* KLUGE: if the user hits Ctrl-C while ssh is prompting
 662          * for a password, then our cleanup's sending of a SIGUSR1
 663          * signal to all our children may kill ssh before it has a
 664          * chance to restore the tty settings (i.e. turn echo back
 665          * on).  By sleeping for a short time, ssh gets a bigger
 666          * chance to do the right thing.  If child processes are
 667          * not ssh waiting for a password, then this tiny delay
 668          * shouldn't hurt anything. */
 669         msleep(400);
 670
 671         /* If we're an rsync daemon listener (not a daemon server),
 672          * we'll exit with status 0 if we received SIGTERM. */
 673         if (am_daemon && !am_server && sig_num == SIGTERM)
 674                 exit_cleanup(0);
 675
 676         /* If the signal arrived on the server side (or for the receiver
 677          * process on the client), we want to try to do a controlled shutdown
 678          * that lets the client side (generator process) know what happened.
 679          * To do this, we set a flag and let the normal process handle the
 680          * shutdown.  We only attempt this if multiplexed IO is in effect and
 681          * we didn't already set the flag. */
 682         if (!got_kill_signal && (am_server || am_receiver)) {
 683                 got_kill_signal = sig_num;
 684                 called_from_signal_handler = 0;
 685                 return;
 686         }
 687
 688         exit_cleanup(RERR_SIGNAL);
 689 }
 690
 691 /* Finish off a file transfer: renaming the file and setting the file's
 692  * attributes (e.g. permissions, ownership, etc.).  If the robust_rename()
 693  * call is forced to copy the temp file and partialptr is both non-NULL and
 694  * not an absolute path, we stage the file into the partial-dir and then
 695  * rename it into place.  This returns 1 on success or 0 on failure. */
 696 int finish_transfer(const char *fname, const char *fnametmp,
 697                     const char *fnamecmp, const char *partialptr,
 698                     struct file_struct *file, int ok_to_set_time,
 699                     int overwriting_basis)
 700 {
 701         int ret;
 702         const char *temp_copy_name = partialptr && *partialptr != '/' ? partialptr : NULL;
 703
 704         if (inplace) {
 705                 if (DEBUG_GTE(RECV, 1))
 706                         rprintf(FINFO, "finishing %s\n", fname);
 707                 fnametmp = fname;
 708                 goto do_set_file_attrs;
 709         }
 710
 711         if (make_backups > 0 && overwriting_basis) {
 712                 int ok = make_backup(fname, False);
 713                 if (!ok)
 714                         exit_cleanup(RERR_FILEIO);
 715                 if (ok == 1 && fnamecmp == fname)
 716                         fnamecmp = get_backup_name(fname);
 717         }
 718
 719         /* Change permissions before putting the file into place. */
 720         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 721                        ok_to_set_time ? ATTRS_ACCURATE_TIME : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME);
 722
 723         /* move tmp file over real file */
 724         if (DEBUG_GTE(RECV, 1))
 725                 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
 726         ret = robust_rename(fnametmp, fname, temp_copy_name, file->mode);
 727         if (ret < 0) {
 728                 rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"",
 729                         ret == -2 ? "copy" : "rename",
 730                         full_fname(fnametmp), fname);
 731                 if (!partialptr || (ret == -2 && temp_copy_name)
 732                  || robust_rename(fnametmp, partialptr, NULL, file->mode) < 0)
 733                         do_unlink(fnametmp);
 734                 return 0;
 735         }
 736         if (ret == 0) {
 737                 /* The file was moved into place (not copied), so it's done. */
 738                 return 1;
 739         }
 740         /* The file was copied, so tweak the perms of the copied file.  If it
 741          * was copied to partialptr, move it into its final destination. */
 742         fnametmp = temp_copy_name ? temp_copy_name : fname;
 743
 744   do_set_file_attrs:
 745         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 746                        ok_to_set_time ? ATTRS_ACCURATE_TIME : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME);
 747
 748         if (temp_copy_name) {
 749                 if (do_rename(fnametmp, fname) < 0) {
 750                         rsyserr(FERROR_XFER, errno, "rename %s -> \"%s\"",
 751                                 full_fname(fnametmp), fname);
 752                         return 0;
 753                 }
 754                 handle_partial_dir(temp_copy_name, PDIR_DELETE);
 755         }
 756         return 1;
 757 }
 758
 759 struct file_list *flist_for_ndx(int ndx, const char *fatal_error_loc)
 760 {
 761         struct file_list *flist = cur_flist;
 762
 763         if (!flist && !(flist = first_flist))
 764                 goto not_found;
 765
 766         while (ndx < flist->ndx_start-1) {
 767                 if (flist == first_flist)
 768                         goto not_found;
 769                 flist = flist->prev;
 770         }
 771         while (ndx >= flist->ndx_start + flist->used) {
 772                 if (!(flist = flist->next))
 773                         goto not_found;
 774         }
 775         return flist;
 776
 777   not_found:
 778         if (fatal_error_loc) {
 779                 int first, last;
 780                 if (first_flist) {
 781                         first = first_flist->ndx_start - 1;
 782                         last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
 783                 } else {
 784                         first = 0;
 785                         last = -1;
 786                 }
 787                 rprintf(FERROR,
 788                         "File-list index %d not in %d - %d (%s) [%s]\n",
 789                         ndx, first, last, fatal_error_loc, who_am_i());
 790                 exit_cleanup(RERR_PROTOCOL);
 791         }
 792         return NULL;
 793 }
 794
 795 const char *who_am_i(void)
 796 {
 797         if (am_starting_up)
 798                 return am_server ? "server" : "client";
 799         return am_sender ? "sender"
 800              : am_generator ? "generator"
 801              : am_receiver ? "receiver"
 802              : "Receiver"; /* pre-forked receiver */
 803 }