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 #ifdef ICONV_CONST
  61 iconv_t ic_chck = (iconv_t)-1;
  62 # ifdef ICONV_OPTION
  63 iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
  64 # endif
  65
  66 #define UPDATED_OWNER (1<<0)
  67 #define UPDATED_GROUP (1<<1)
  68 #define UPDATED_MTIME (1<<2)
  69 #define UPDATED_ATIME (1<<3)
  70 #define UPDATED_ACLS  (1<<4)
  71 #define UPDATED_MODE  (1<<5)
  72
  73 #define UPDATED_TIMES (UPDATED_MTIME|UPDATED_ATIME)
  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,
 322                        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) free(s->sums);
 441         free(s);
 442 }
 443
 444 /* This is only called when we aren't preserving permissions.  Figure out what
 445  * the permissions should be and return them merged back into the mode. */
 446 mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
 447                  int exists)
 448 {
 449         int new_mode;
 450         /* If the file already exists, we'll return the local permissions,
 451          * possibly tweaked by the --executability option. */
 452         if (exists) {
 453                 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
 454                 if (preserve_executability && S_ISREG(flist_mode)) {
 455                         /* If the source file is executable, grant execute
 456                          * rights to everyone who can read, but ONLY if the
 457                          * file isn't already executable. */
 458                         if (!(flist_mode & 0111))
 459                                 new_mode &= ~0111;
 460                         else if (!(stat_mode & 0111))
 461                                 new_mode |= (new_mode & 0444) >> 2;
 462                 }
 463         } else {
 464                 /* Apply destination default permissions and turn
 465                  * off special permissions. */
 466                 new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
 467         }
 468         return new_mode;
 469 }
 470
 471 int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
 472                    const char *fnamecmp, int flags)
 473 {
 474         int updated = 0;
 475         stat_x sx2;
 476         int change_uid, change_gid;
 477         mode_t new_mode = file->mode;
 478         int inherit;
 479
 480         if (!sxp) {
 481                 if (dry_run)
 482                         return 1;
 483                 if (link_stat(fname, &sx2.st, 0) < 0) {
 484                         rsyserr(FERROR_XFER, errno, "stat %s failed",
 485                                 full_fname(fname));
 486                         return 0;
 487                 }
 488                 init_stat_x(&sx2);
 489                 sxp = &sx2;
 490                 inherit = !preserve_perms;
 491         } else
 492                 inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;
 493
 494         if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
 495                 /* We just created this directory and its setgid
 496                  * bit is on, so make sure it stays on. */
 497                 new_mode |= S_ISGID;
 498         }
 499
 500         if (daemon_chmod_modes && !S_ISLNK(new_mode))
 501                 new_mode = tweak_mode(new_mode, daemon_chmod_modes);
 502
 503 #ifdef SUPPORT_ACLS
 504         if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
 505                 get_acl(fname, sxp);
 506 #endif
 507
 508         change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
 509         change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
 510                   && sxp->st.st_gid != (gid_t)F_GROUP(file);
 511 #ifndef CAN_CHOWN_SYMLINK
 512         if (S_ISLNK(sxp->st.st_mode)) {
 513                 ;
 514         } else
 515 #endif
 516         if (change_uid || change_gid) {
 517                 if (DEBUG_GTE(OWN, 1)) {
 518                         if (change_uid) {
 519                                 rprintf(FINFO,
 520                                         "set uid of %s from %u to %u\n",
 521                                         fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
 522                         }
 523                         if (change_gid) {
 524                                 rprintf(FINFO,
 525                                         "set gid of %s from %u to %u\n",
 526                                         fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
 527                         }
 528                 }
 529                 if (am_root >= 0) {
 530                         uid_t uid = change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid;
 531                         gid_t gid = change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid;
 532                         if (do_lchown(fname, uid, gid) != 0) {
 533                                 /* We shouldn't have attempted to change uid
 534                                  * or gid unless have the privilege. */
 535                                 rsyserr(FERROR_XFER, errno, "%s %s failed",
 536                                     change_uid ? "chown" : "chgrp",
 537                                     full_fname(fname));
 538                                 goto cleanup;
 539                         }
 540                         if (uid == (uid_t)-1 && sxp->st.st_uid != (uid_t)-1)
 541                                 rprintf(FERROR_XFER, "uid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 542                         if (gid == (gid_t)-1 && sxp->st.st_gid != (gid_t)-1)
 543                                 rprintf(FERROR_XFER, "gid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 544                         /* A lchown had been done, so we need to re-stat if
 545                          * the destination had the setuid or setgid bits set
 546                          * (due to the side effect of the chown call). */
 547                         if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
 548                                 link_stat(fname, &sxp->st,
 549                                           keep_dirlinks && S_ISDIR(sxp->st.st_mode));
 550                         }
 551                 }
 552                 if (change_uid)
 553                     updated |= UPDATED_OWNER;
 554                 if (change_gid)
 555                     updated |= UPDATED_GROUP;
 556         }
 557
 558 #ifdef SUPPORT_XATTRS
 559         if (am_root < 0)
 560                 set_stat_xattr(fname, file, new_mode);
 561         if (preserve_xattrs && fnamecmp)
 562                 set_xattr(fname, file, fnamecmp, sxp);
 563 #endif
 564
 565         if (!preserve_times
 566          || (!(preserve_times & PRESERVE_DIR_TIMES) && S_ISDIR(sxp->st.st_mode))
 567          || (!(preserve_times & PRESERVE_LINK_TIMES) && S_ISLNK(sxp->st.st_mode)))
 568                 flags |= ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME;
 569         else if (sxp != &sx2)
 570                 memcpy(&sx2.st, &sxp->st, sizeof (sx2.st));
 571         if (!atimes_ndx || S_ISDIR(sxp->st.st_mode))
 572                 flags |= ATTRS_SKIP_ATIME;
 573         if (!(flags & ATTRS_SKIP_MTIME)
 574          && (sxp->st.st_mtime != file->modtime
 575 #ifdef ST_MTIME_NSEC
 576           || (flags & ATTRS_SET_NANO && NSEC_BUMP(file) && (uint32)sxp->st.ST_MTIME_NSEC != F_MOD_NSEC(file))
 577 #endif
 578           )) {
 579                 sx2.st.st_mtime = file->modtime;
 580 #ifdef ST_MTIME_NSEC
 581                 sx2.st.ST_MTIME_NSEC = F_MOD_NSEC_or_0(file);
 582 #endif
 583                 updated |= UPDATED_MTIME;
 584         }
 585         if (!(flags & ATTRS_SKIP_ATIME)) {
 586                 time_t file_atime = F_ATIME(file);
 587                 if (cmp_time(sxp->st.st_atime, 0, file_atime, 0) != 0) {
 588                         sx2.st.st_atime = file_atime;
 589 #ifdef ST_ATIME_NSEC
 590                         sx2.st.ST_ATIME_NSEC = 0;
 591 #endif
 592                         updated |= UPDATED_ATIME;
 593                 }
 594         }
 595         if (updated & UPDATED_TIMES) {
 596                 int ret = set_times(fname, &sx2.st);
 597                 if (ret < 0) {
 598                         rsyserr(FERROR_XFER, errno, "failed to set times on %s",
 599                                 full_fname(fname));
 600                         goto cleanup;
 601                 }
 602                 if (ret > 0) { /* ret == 1 if symlink could not be set */
 603                         updated &= ~UPDATED_TIMES;
 604                         file->flags |= FLAG_TIME_FAILED;
 605                 }
 606         }
 607
 608 #ifdef SUPPORT_ACLS
 609         /* It's OK to call set_acl() now, even for a dir, as the generator
 610          * will enable owner-writability using chmod, if necessary.
 611          *
 612          * If set_acl() changes permission bits in the process of setting
 613          * an access ACL, it changes sxp->st.st_mode so we know whether we
 614          * need to chmod(). */
 615         if (preserve_acls && !S_ISLNK(new_mode)) {
 616                 if (set_acl(fname, file, sxp, new_mode) > 0)
 617                         updated |= UPDATED_ACLS;
 618         }
 619 #endif
 620
 621 #ifdef HAVE_CHMOD
 622         if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
 623                 int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
 624                 if (ret < 0) {
 625                         rsyserr(FERROR_XFER, errno,
 626                                 "failed to set permissions on %s",
 627                                 full_fname(fname));
 628                         goto cleanup;
 629                 }
 630                 if (ret == 0) /* ret == 1 if symlink could not be set */
 631                         updated |= UPDATED_MODE;
 632         }
 633 #endif
 634
 635         if (INFO_GTE(NAME, 2) && flags & ATTRS_REPORT) {
 636                 if (updated)
 637                         rprintf(FCLIENT, "%s\n", fname);
 638                 else
 639                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 640         }
 641   cleanup:
 642         if (sxp == &sx2)
 643                 free_stat_x(&sx2);
 644         return updated;
 645 }
 646
 647 /* This is only called for SIGINT, SIGHUP, and SIGTERM. */
 648 void sig_int(int sig_num)
 649 {
 650         called_from_signal_handler = 1;
 651
 652         /* KLUGE: if the user hits Ctrl-C while ssh is prompting
 653          * for a password, then our cleanup's sending of a SIGUSR1
 654          * signal to all our children may kill ssh before it has a
 655          * chance to restore the tty settings (i.e. turn echo back
 656          * on).  By sleeping for a short time, ssh gets a bigger
 657          * chance to do the right thing.  If child processes are
 658          * not ssh waiting for a password, then this tiny delay
 659          * shouldn't hurt anything. */
 660         msleep(400);
 661
 662         /* If we're an rsync daemon listener (not a daemon server),
 663          * we'll exit with status 0 if we received SIGTERM. */
 664         if (am_daemon && !am_server && sig_num == SIGTERM)
 665                 exit_cleanup(0);
 666
 667         /* If the signal arrived on the server side (or for the receiver
 668          * process on the client), we want to try to do a controlled shutdown
 669          * that lets the client side (generator process) know what happened.
 670          * To do this, we set a flag and let the normal process handle the
 671          * shutdown.  We only attempt this if multiplexed IO is in effect and
 672          * we didn't already set the flag. */
 673         if (!got_kill_signal && (am_server || am_receiver)) {
 674                 got_kill_signal = sig_num;
 675                 called_from_signal_handler = 0;
 676                 return;
 677         }
 678
 679         exit_cleanup(RERR_SIGNAL);
 680 }
 681
 682 /* Finish off a file transfer: renaming the file and setting the file's
 683  * attributes (e.g. permissions, ownership, etc.).  If the robust_rename()
 684  * call is forced to copy the temp file and partialptr is both non-NULL and
 685  * not an absolute path, we stage the file into the partial-dir and then
 686  * rename it into place.  This returns 1 on success or 0 on failure. */
 687 int finish_transfer(const char *fname, const char *fnametmp,
 688                     const char *fnamecmp, const char *partialptr,
 689                     struct file_struct *file, int ok_to_set_time,
 690                     int overwriting_basis)
 691 {
 692         int ret;
 693         const char *temp_copy_name = partialptr && *partialptr != '/' ? partialptr : NULL;
 694
 695         if (inplace) {
 696                 if (DEBUG_GTE(RECV, 1))
 697                         rprintf(FINFO, "finishing %s\n", fname);
 698                 fnametmp = fname;
 699                 goto do_set_file_attrs;
 700         }
 701
 702         if (make_backups > 0 && overwriting_basis) {
 703                 int ok = make_backup(fname, False);
 704                 if (!ok)
 705                         exit_cleanup(RERR_FILEIO);
 706                 if (ok == 1 && fnamecmp == fname)
 707                         fnamecmp = get_backup_name(fname);
 708         }
 709
 710         /* Change permissions before putting the file into place. */
 711         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 712                        ok_to_set_time ? ATTRS_SET_NANO : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME);
 713
 714         /* move tmp file over real file */
 715         if (DEBUG_GTE(RECV, 1))
 716                 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
 717         ret = robust_rename(fnametmp, fname, temp_copy_name, file->mode);
 718         if (ret < 0) {
 719                 rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"",
 720                         ret == -2 ? "copy" : "rename",
 721                         full_fname(fnametmp), fname);
 722                 if (!partialptr || (ret == -2 && temp_copy_name)
 723                  || robust_rename(fnametmp, partialptr, NULL, file->mode) < 0)
 724                         do_unlink(fnametmp);
 725                 return 0;
 726         }
 727         if (ret == 0) {
 728                 /* The file was moved into place (not copied), so it's done. */
 729                 return 1;
 730         }
 731         /* The file was copied, so tweak the perms of the copied file.  If it
 732          * was copied to partialptr, move it into its final destination. */
 733         fnametmp = temp_copy_name ? temp_copy_name : fname;
 734
 735   do_set_file_attrs:
 736         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 737                        ok_to_set_time ? ATTRS_SET_NANO : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME);
 738
 739         if (temp_copy_name) {
 740                 if (do_rename(fnametmp, fname) < 0) {
 741                         rsyserr(FERROR_XFER, errno, "rename %s -> \"%s\"",
 742                                 full_fname(fnametmp), fname);
 743                         return 0;
 744                 }
 745                 handle_partial_dir(temp_copy_name, PDIR_DELETE);
 746         }
 747         return 1;
 748 }
 749
 750 struct file_list *flist_for_ndx(int ndx, const char *fatal_error_loc)
 751 {
 752         struct file_list *flist = cur_flist;
 753
 754         if (!flist && !(flist = first_flist))
 755                 goto not_found;
 756
 757         while (ndx < flist->ndx_start-1) {
 758                 if (flist == first_flist)
 759                         goto not_found;
 760                 flist = flist->prev;
 761         }
 762         while (ndx >= flist->ndx_start + flist->used) {
 763                 if (!(flist = flist->next))
 764                         goto not_found;
 765         }
 766         return flist;
 767
 768   not_found:
 769         if (fatal_error_loc) {
 770                 int first, last;
 771                 if (first_flist) {
 772                         first = first_flist->ndx_start - 1;
 773                         last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
 774                 } else {
 775                         first = 0;
 776                         last = -1;
 777                 }
 778                 rprintf(FERROR,
 779                         "File-list index %d not in %d - %d (%s) [%s]\n",
 780                         ndx, first, last, fatal_error_loc, who_am_i());
 781                 exit_cleanup(RERR_PROTOCOL);
 782         }
 783         return NULL;
 784 }
 785
 786 const char *who_am_i(void)
 787 {
 788         if (am_starting_up)
 789                 return am_server ? "server" : "client";
 790         return am_sender ? "sender"
 791              : am_generator ? "generator"
 792              : am_receiver ? "receiver"
 793              : "Receiver"; /* pre-forked receiver */
 794 }