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) 2003-2014 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 inc_recurse;
  47 extern int inplace;
  48 extern int flist_eof;
  49 extern int file_old_total;
  50 extern int keep_dirlinks;
  51 extern int make_backups;
  52 extern struct file_list *cur_flist, *first_flist, *dir_flist;
  53 extern struct chmod_mode_struct *daemon_chmod_modes;
  54 #ifdef ICONV_OPTION
  55 extern char *iconv_opt;
  56 #endif
  57
  58 #ifdef ICONV_CONST
  59 iconv_t ic_chck = (iconv_t)-1;
  60 # ifdef ICONV_OPTION
  61 iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
  62 # endif
  63
  64 static const char *default_charset(void)
  65 {
  66 # if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
  67         return locale_charset();
  68 # elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
  69         return nl_langinfo(CODESET);
  70 # else
  71         return ""; /* Works with (at the very least) gnu iconv... */
  72 # endif
  73 }
  74
  75 void setup_iconv(void)
  76 {
  77         const char *defset = default_charset();
  78 # ifdef ICONV_OPTION
  79         const char *charset;
  80         char *cp;
  81 # endif
  82
  83         if (!am_server && !allow_8bit_chars) {
  84                 /* It's OK if this fails... */
  85                 ic_chck = iconv_open(defset, defset);
  86
  87                 if (DEBUG_GTE(ICONV, 2)) {
  88                         if (ic_chck == (iconv_t)-1) {
  89                                 rprintf(FINFO,
  90                                         "msg checking via isprint()"
  91                                         " (iconv_open(\"%s\", \"%s\") errno: %d)\n",
  92                                         defset, defset, errno);
  93                         } else {
  94                                 rprintf(FINFO,
  95                                         "msg checking charset: %s\n",
  96                                         defset);
  97                         }
  98                 }
  99         } else
 100                 ic_chck = (iconv_t)-1;
 101
 102 # ifdef ICONV_OPTION
 103         if (!iconv_opt)
 104                 return;
 105
 106         if ((cp = strchr(iconv_opt, ',')) != NULL) {
 107                 if (am_server) /* A local transfer needs this. */
 108                         iconv_opt = cp + 1;
 109                 else
 110                         *cp = '\0';
 111         }
 112
 113         if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))
 114                 charset = defset;
 115         else
 116                 charset = iconv_opt;
 117
 118         if ((ic_send = iconv_open(UTF8_CHARSET, charset)) == (iconv_t)-1) {
 119                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 120                         UTF8_CHARSET, charset);
 121                 exit_cleanup(RERR_UNSUPPORTED);
 122         }
 123
 124         if ((ic_recv = iconv_open(charset, UTF8_CHARSET)) == (iconv_t)-1) {
 125                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 126                         charset, UTF8_CHARSET);
 127                 exit_cleanup(RERR_UNSUPPORTED);
 128         }
 129
 130         if (DEBUG_GTE(ICONV, 1)) {
 131                 rprintf(FINFO, "[%s] charset: %s\n",
 132                         who_am_i(), *charset ? charset : "[LOCALE]");
 133         }
 134 # endif
 135 }
 136
 137 /* This function converts the chars in the "in" xbuf into characters in the
 138  * "out" xbuf.  The ".len" chars of the "in" xbuf is used starting from its
 139  * ".pos".  The ".size" of the "out" xbuf restricts how many characters can
 140  * be stored, starting at its ".pos+.len" position.  Note that the last byte
 141  * of the "out" xbuf is not used, which reserves space for a trailing '\0'
 142  * (though it is up to the caller to store a trailing '\0', as needed).
 143  *
 144  * We return a 0 on success or a -1 on error.  An error also sets errno to
 145  * E2BIG, EILSEQ, or EINVAL (see below); otherwise errno will be set to 0.
 146  * The "in" xbuf is altered to update ".pos" and ".len".  The "out" xbuf has
 147  * data appended, and its ".len" incremented (see below for a ".size" note).
 148  *
 149  * If ICB_CIRCULAR_OUT is set in "flags", the chars going into the "out" xbuf
 150  * can wrap around to the start, and the xbuf may have its ".size" reduced
 151  * (presumably by 1 byte) if the iconv code doesn't have space to store a
 152  * multi-byte character at the physical end of the ".buf" (though no reducing
 153  * happens if ".pos" is <= 1, since there is no room to wrap around).
 154  *
 155  * If ICB_EXPAND_OUT is set in "flags", the "out" xbuf will be allocated if
 156  * empty, and (as long as ICB_CIRCULAR_OUT is not set) expanded if too small.
 157  * This prevents the return of E2BIG (except for a circular xbuf).
 158  *
 159  * If ICB_INCLUDE_BAD is set in "flags", any badly-encoded chars are included
 160  * verbatim in the "out" xbuf, so EILSEQ will not be returned.
 161  *
 162  * If ICB_INCLUDE_INCOMPLETE is set in "flags", any incomplete multi-byte
 163  * chars are included, which ensures that EINVAL is not returned.
 164  *
 165  * If ICB_INIT is set, the iconv() conversion state is initialized prior to
 166  * processing the characters. */
 167 int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
 168 {
 169         ICONV_CONST char *ibuf;
 170         size_t icnt, ocnt, opos;
 171         char *obuf;
 172
 173         if (!out->size && flags & ICB_EXPAND_OUT) {
 174                 size_t siz = ROUND_UP_1024(in->len * 2);
 175                 alloc_xbuf(out, siz);
 176         } else if (out->len+1 >= out->size) {
 177                 /* There is no room to even start storing data. */
 178                 if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
 179                         errno = E2BIG;
 180                         return -1;
 181                 }
 182                 realloc_xbuf(out, out->size + ROUND_UP_1024(in->len * 2));
 183         }
 184
 185         if (flags & ICB_INIT)
 186                 iconv(ic, NULL, 0, NULL, 0);
 187
 188         ibuf = in->buf + in->pos;
 189         icnt = in->len;
 190
 191         opos = out->pos + out->len;
 192         if (flags & ICB_CIRCULAR_OUT) {
 193                 if (opos >= out->size) {
 194                         opos -= out->size;
 195                         /* We know that out->pos is not 0 due to the "no room" check
 196                          * above, so this can't go "negative". */
 197                         ocnt = out->pos - opos - 1;
 198                 } else {
 199                         /* Allow the use of all bytes to the physical end of the buffer
 200                          * unless pos is 0, in which case we reserve our trailing '\0'. */
 201                         ocnt = out->size - opos - (out->pos ? 0 : 1);
 202                 }
 203         } else
 204                 ocnt = out->size - opos - 1;
 205         obuf = out->buf + opos;
 206
 207         while (icnt) {
 208                 while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {
 209                         if (errno == EINTR)
 210                                 continue;
 211                         if (errno == EINVAL) {
 212                                 if (!(flags & ICB_INCLUDE_INCOMPLETE))
 213                                         goto finish;
 214                                 if (!ocnt)
 215                                         goto e2big;
 216                         } else if (errno == EILSEQ) {
 217                                 if (!(flags & ICB_INCLUDE_BAD))
 218                                         goto finish;
 219                                 if (!ocnt)
 220                                         goto e2big;
 221                         } else if (errno == E2BIG) {
 222                                 size_t siz;
 223                           e2big:
 224                                 opos = obuf - out->buf;
 225                                 if (flags & ICB_CIRCULAR_OUT && out->pos > 1 && opos > out->pos) {
 226                                         /* We are in a divided circular buffer at the physical
 227                                          * end with room to wrap to the start.  If iconv() refused
 228                                          * to use one or more trailing bytes in the buffer, we
 229                                          * set the size to ignore the unused bytes. */
 230                                         if (opos < out->size)
 231                                                 reduce_iobuf_size(out, opos);
 232                                         obuf = out->buf;
 233                                         ocnt = out->pos - 1;
 234                                         continue;
 235                                 }
 236                                 if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
 237                                         errno = E2BIG;
 238                                         goto finish;
 239                                 }
 240                                 siz = ROUND_UP_1024(in->len * 2);
 241                                 realloc_xbuf(out, out->size + siz);
 242                                 obuf = out->buf + opos;
 243                                 ocnt += siz;
 244                                 continue;
 245                         } else {
 246                                 rsyserr(FERROR, errno, "unexpected error from iconv()");
 247                                 exit_cleanup(RERR_UNSUPPORTED);
 248                         }
 249                         *obuf++ = *ibuf++;
 250                         ocnt--, icnt--;
 251                         if (!icnt)
 252                                 break;
 253                 }
 254         }
 255
 256         errno = 0;
 257
 258   finish:
 259         opos = obuf - out->buf;
 260         if (flags & ICB_CIRCULAR_OUT && opos < out->pos)
 261                 opos += out->size;
 262         out->len = opos - out->pos;
 263
 264         in->len = icnt;
 265         in->pos = ibuf - in->buf;
 266
 267         return errno ? -1 : 0;
 268 }
 269 #endif
 270
 271 void send_protected_args(int fd, char *args[])
 272 {
 273         int i;
 274 #ifdef ICONV_OPTION
 275         int convert = ic_send != (iconv_t)-1;
 276         xbuf outbuf, inbuf;
 277
 278         if (convert)
 279                 alloc_xbuf(&outbuf, 1024);
 280 #endif
 281
 282         for (i = 0; args[i]; i++) {} /* find first NULL */
 283         args[i] = "rsync"; /* set a new arg0 */
 284         if (DEBUG_GTE(CMD, 1))
 285                 print_child_argv("protected args:", args + i + 1);
 286         do {
 287                 if (!args[i][0])
 288                         write_buf(fd, ".", 2);
 289 #ifdef ICONV_OPTION
 290                 else if (convert) {
 291                         INIT_XBUF_STRLEN(inbuf, args[i]);
 292                         iconvbufs(ic_send, &inbuf, &outbuf,
 293                                   ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT);
 294                         outbuf.buf[outbuf.len] = '\0';
 295                         write_buf(fd, outbuf.buf, outbuf.len + 1);
 296                         outbuf.len = 0;
 297                 }
 298 #endif
 299                 else
 300                         write_buf(fd, args[i], strlen(args[i]) + 1);
 301         } while (args[++i]);
 302         write_byte(fd, 0);
 303
 304 #ifdef ICONV_OPTION
 305         if (convert)
 306                 free(outbuf.buf);
 307 #endif
 308 }
 309
 310 int read_ndx_and_attrs(int f_in, int f_out, int *iflag_ptr, uchar *type_ptr,
 311                        char *buf, int *len_ptr)
 312 {
 313         int len, iflags = 0;
 314         struct file_list *flist;
 315         uchar fnamecmp_type = FNAMECMP_FNAME;
 316         int ndx;
 317
 318   read_loop:
 319         while (1) {
 320                 ndx = read_ndx(f_in);
 321
 322                 if (ndx >= 0)
 323                         break;
 324                 if (ndx == NDX_DONE)
 325                         return ndx;
 326                 if (ndx == NDX_DEL_STATS) {
 327                         read_del_stats(f_in);
 328                         if (am_sender && am_server)
 329                                 write_del_stats(f_out);
 330                         continue;
 331                 }
 332                 if (!inc_recurse || am_sender) {
 333                         int last;
 334                         if (first_flist)
 335                                 last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
 336                         else
 337                                 last = -1;
 338                         rprintf(FERROR,
 339                                 "Invalid file index: %d (%d - %d) [%s]\n",
 340                                 ndx, NDX_DONE, last, who_am_i());
 341                         exit_cleanup(RERR_PROTOCOL);
 342                 }
 343                 if (ndx == NDX_FLIST_EOF) {
 344                         flist_eof = 1;
 345                         if (DEBUG_GTE(FLIST, 3))
 346                                 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
 347                         write_int(f_out, NDX_FLIST_EOF);
 348                         continue;
 349                 }
 350                 ndx = NDX_FLIST_OFFSET - ndx;
 351                 if (ndx < 0 || ndx >= dir_flist->used) {
 352                         ndx = NDX_FLIST_OFFSET - ndx;
 353                         rprintf(FERROR,
 354                                 "Invalid dir index: %d (%d - %d) [%s]\n",
 355                                 ndx, NDX_FLIST_OFFSET,
 356                                 NDX_FLIST_OFFSET - dir_flist->used + 1,
 357                                 who_am_i());
 358                         exit_cleanup(RERR_PROTOCOL);
 359                 }
 360
 361                 if (DEBUG_GTE(FLIST, 2)) {
 362                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
 363                                 who_am_i(), ndx);
 364                 }
 365                 /* Send all the data we read for this flist to the generator. */
 366                 start_flist_forward(ndx);
 367                 flist = recv_file_list(f_in);
 368                 flist->parent_ndx = ndx;
 369                 stop_flist_forward();
 370         }
 371
 372         iflags = protocol_version >= 29 ? read_shortint(f_in)
 373                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 374
 375         /* Support the protocol-29 keep-alive style. */
 376         if (protocol_version < 30 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
 377                 if (am_sender)
 378                         maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH);
 379                 goto read_loop;
 380         }
 381
 382         flist = flist_for_ndx(ndx, "read_ndx_and_attrs");
 383         if (flist != cur_flist) {
 384                 cur_flist = flist;
 385                 if (am_sender) {
 386                         file_old_total = cur_flist->used;
 387                         for (flist = first_flist; flist != cur_flist; flist = flist->next)
 388                                 file_old_total += flist->used;
 389                 }
 390         }
 391
 392         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 393                 fnamecmp_type = read_byte(f_in);
 394         *type_ptr = fnamecmp_type;
 395
 396         if (iflags & ITEM_XNAME_FOLLOWS) {
 397                 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
 398                         exit_cleanup(RERR_PROTOCOL);
 399         } else {
 400                 *buf = '\0';
 401                 len = -1;
 402         }
 403         *len_ptr = len;
 404
 405         if (iflags & ITEM_TRANSFER) {
 406                 int i = ndx - cur_flist->ndx_start;
 407                 if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {
 408                         rprintf(FERROR,
 409                                 "received request to transfer non-regular file: %d [%s]\n",
 410                                 ndx, who_am_i());
 411                         exit_cleanup(RERR_PROTOCOL);
 412                 }
 413         }
 414
 415         *iflag_ptr = iflags;
 416         return ndx;
 417 }
 418
 419 /*
 420   free a sums struct
 421   */
 422 void free_sums(struct sum_struct *s)
 423 {
 424         if (s->sums) free(s->sums);
 425         free(s);
 426 }
 427
 428 /* This is only called when we aren't preserving permissions.  Figure out what
 429  * the permissions should be and return them merged back into the mode. */
 430 mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
 431                  int exists)
 432 {
 433         int new_mode;
 434         /* If the file already exists, we'll return the local permissions,
 435          * possibly tweaked by the --executability option. */
 436         if (exists) {
 437                 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
 438                 if (preserve_executability && S_ISREG(flist_mode)) {
 439                         /* If the source file is executable, grant execute
 440                          * rights to everyone who can read, but ONLY if the
 441                          * file isn't already executable. */
 442                         if (!(flist_mode & 0111))
 443                                 new_mode &= ~0111;
 444                         else if (!(stat_mode & 0111))
 445                                 new_mode |= (new_mode & 0444) >> 2;
 446                 }
 447         } else {
 448                 /* Apply destination default permissions and turn
 449                  * off special permissions. */
 450                 new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
 451         }
 452         return new_mode;
 453 }
 454
 455 int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
 456                    const char *fnamecmp, int flags)
 457 {
 458         int updated = 0;
 459         stat_x sx2;
 460         int change_uid, change_gid;
 461         mode_t new_mode = file->mode;
 462         int inherit;
 463
 464         if (!sxp) {
 465                 if (dry_run)
 466                         return 1;
 467                 if (link_stat(fname, &sx2.st, 0) < 0) {
 468                         rsyserr(FERROR_XFER, errno, "stat %s failed",
 469                                 full_fname(fname));
 470                         return 0;
 471                 }
 472                 init_stat_x(&sx2);
 473                 sxp = &sx2;
 474                 inherit = !preserve_perms;
 475         } else
 476                 inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;
 477
 478         if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
 479                 /* We just created this directory and its setgid
 480                  * bit is on, so make sure it stays on. */
 481                 new_mode |= S_ISGID;
 482         }
 483
 484         if (daemon_chmod_modes && !S_ISLNK(new_mode))
 485                 new_mode = tweak_mode(new_mode, daemon_chmod_modes);
 486
 487 #ifdef SUPPORT_ACLS
 488         if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
 489                 get_acl(fname, sxp);
 490 #endif
 491
 492         change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
 493         change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
 494                   && sxp->st.st_gid != (gid_t)F_GROUP(file);
 495 #ifndef CAN_CHOWN_SYMLINK
 496         if (S_ISLNK(sxp->st.st_mode)) {
 497                 ;
 498         } else
 499 #endif
 500         if (change_uid || change_gid) {
 501                 if (DEBUG_GTE(OWN, 1)) {
 502                         if (change_uid) {
 503                                 rprintf(FINFO,
 504                                         "set uid of %s from %u to %u\n",
 505                                         fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
 506                         }
 507                         if (change_gid) {
 508                                 rprintf(FINFO,
 509                                         "set gid of %s from %u to %u\n",
 510                                         fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
 511                         }
 512                 }
 513                 if (am_root >= 0) {
 514                         uid_t uid = change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid;
 515                         gid_t gid = change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid;
 516                         if (do_lchown(fname, uid, gid) != 0) {
 517                                 /* We shouldn't have attempted to change uid
 518                                  * or gid unless have the privilege. */
 519                                 rsyserr(FERROR_XFER, errno, "%s %s failed",
 520                                     change_uid ? "chown" : "chgrp",
 521                                     full_fname(fname));
 522                                 goto cleanup;
 523                         }
 524                         if (uid == (uid_t)-1 && sxp->st.st_uid != (uid_t)-1)
 525                                 rprintf(FERROR_XFER, "uid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 526                         if (gid == (gid_t)-1 && sxp->st.st_gid != (gid_t)-1)
 527                                 rprintf(FERROR_XFER, "gid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
 528                         /* A lchown had been done, so we need to re-stat if
 529                          * the destination had the setuid or setgid bits set
 530                          * (due to the side effect of the chown call). */
 531                         if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
 532                                 link_stat(fname, &sxp->st,
 533                                           keep_dirlinks && S_ISDIR(sxp->st.st_mode));
 534                         }
 535                 }
 536                 updated = 1;
 537         }
 538
 539 #ifdef SUPPORT_XATTRS
 540         if (am_root < 0)
 541                 set_stat_xattr(fname, file, new_mode);
 542         if (preserve_xattrs && fnamecmp)
 543                 set_xattr(fname, file, fnamecmp, sxp);
 544 #endif
 545
 546         if (!preserve_times
 547          || (!(preserve_times & PRESERVE_DIR_TIMES) && S_ISDIR(sxp->st.st_mode))
 548          || (!(preserve_times & PRESERVE_LINK_TIMES) && S_ISLNK(sxp->st.st_mode)))
 549                 flags |= ATTRS_SKIP_MTIME;
 550         if (!(flags & ATTRS_SKIP_MTIME)
 551             && cmp_time(sxp->st.st_mtime, file->modtime) != 0) {
 552                 int ret = set_modtime(fname, file->modtime, F_MOD_NSEC(file), sxp->st.st_mode);
 553                 if (ret < 0) {
 554                         rsyserr(FERROR_XFER, errno, "failed to set times on %s",
 555                                 full_fname(fname));
 556                         goto cleanup;
 557                 }
 558                 if (ret == 0) /* ret == 1 if symlink could not be set */
 559                         updated = 1;
 560                 else
 561                         file->flags |= FLAG_TIME_FAILED;
 562         }
 563
 564 #ifdef SUPPORT_ACLS
 565         /* It's OK to call set_acl() now, even for a dir, as the generator
 566          * will enable owner-writability using chmod, if necessary.
 567          *
 568          * If set_acl() changes permission bits in the process of setting
 569          * an access ACL, it changes sxp->st.st_mode so we know whether we
 570          * need to chmod(). */
 571         if (preserve_acls && !S_ISLNK(new_mode)) {
 572                 if (set_acl(fname, file, sxp, new_mode) > 0)
 573                         updated = 1;
 574         }
 575 #endif
 576
 577 #ifdef HAVE_CHMOD
 578         if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
 579                 int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
 580                 if (ret < 0) {
 581                         rsyserr(FERROR_XFER, errno,
 582                                 "failed to set permissions on %s",
 583                                 full_fname(fname));
 584                         goto cleanup;
 585                 }
 586                 if (ret == 0) /* ret == 1 if symlink could not be set */
 587                         updated = 1;
 588         }
 589 #endif
 590
 591         if (INFO_GTE(NAME, 2) && flags & ATTRS_REPORT) {
 592                 if (updated)
 593                         rprintf(FCLIENT, "%s\n", fname);
 594                 else
 595                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 596         }
 597   cleanup:
 598         if (sxp == &sx2)
 599                 free_stat_x(&sx2);
 600         return updated;
 601 }
 602
 603 /* This is only called for SIGINT, SIGHUP, and SIGTERM. */
 604 RETSIGTYPE sig_int(int sig_num)
 605 {
 606         /* KLUGE: if the user hits Ctrl-C while ssh is prompting
 607          * for a password, then our cleanup's sending of a SIGUSR1
 608          * signal to all our children may kill ssh before it has a
 609          * chance to restore the tty settings (i.e. turn echo back
 610          * on).  By sleeping for a short time, ssh gets a bigger
 611          * chance to do the right thing.  If child processes are
 612          * not ssh waiting for a password, then this tiny delay
 613          * shouldn't hurt anything. */
 614         msleep(400);
 615
 616         /* If we're an rsync daemon listener (not a daemon server),
 617          * we'll exit with status 0 if we received SIGTERM. */
 618         if (am_daemon && !am_server && sig_num == SIGTERM)
 619                 exit_cleanup(0);
 620
 621         /* If the signal arrived on the server side (or for the receiver
 622          * process on the client), we want to try to do a controlled shutdown
 623          * that lets the client side (generator process) know what happened.
 624          * To do this, we set a flag and let the normal process handle the
 625          * shutdown.  We only attempt this if multiplexed IO is in effect and
 626          * we didn't already set the flag. */
 627         if (!got_kill_signal && (am_server || am_receiver)) {
 628                 got_kill_signal = sig_num;
 629                 return;
 630         }
 631
 632         exit_cleanup(RERR_SIGNAL);
 633 }
 634
 635 /* Finish off a file transfer: renaming the file and setting the file's
 636  * attributes (e.g. permissions, ownership, etc.).  If the robust_rename()
 637  * call is forced to copy the temp file and partialptr is both non-NULL and
 638  * not an absolute path, we stage the file into the partial-dir and then
 639  * rename it into place.  This returns 1 on succcess or 0 on failure. */
 640 int finish_transfer(const char *fname, const char *fnametmp,
 641                     const char *fnamecmp, const char *partialptr,
 642                     struct file_struct *file, int ok_to_set_time,
 643                     int overwriting_basis)
 644 {
 645         int ret;
 646         const char *temp_copy_name = partialptr && *partialptr != '/' ? partialptr : NULL;
 647
 648         if (inplace) {
 649                 if (DEBUG_GTE(RECV, 1))
 650                         rprintf(FINFO, "finishing %s\n", fname);
 651                 fnametmp = fname;
 652                 goto do_set_file_attrs;
 653         }
 654
 655         if (make_backups > 0 && overwriting_basis) {
 656                 int ok = make_backup(fname, False);
 657                 if (!ok)
 658                         return 1;
 659                 if (ok == 1 && fnamecmp == fname)
 660                         fnamecmp = get_backup_name(fname);
 661         }
 662
 663         /* Change permissions before putting the file into place. */
 664         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 665                        ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
 666
 667         /* move tmp file over real file */
 668         if (DEBUG_GTE(RECV, 1))
 669                 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
 670         ret = robust_rename(fnametmp, fname, temp_copy_name, file->mode);
 671         if (ret < 0) {
 672                 rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"",
 673                         ret == -2 ? "copy" : "rename",
 674                         full_fname(fnametmp), fname);
 675                 if (!partialptr || (ret == -2 && temp_copy_name)
 676                  || robust_rename(fnametmp, partialptr, NULL, file->mode) < 0)
 677                         do_unlink(fnametmp);
 678                 return 0;
 679         }
 680         if (ret == 0) {
 681                 /* The file was moved into place (not copied), so it's done. */
 682                 return 1;
 683         }
 684         /* The file was copied, so tweak the perms of the copied file.  If it
 685          * was copied to partialptr, move it into its final destination. */
 686         fnametmp = temp_copy_name ? temp_copy_name : fname;
 687
 688   do_set_file_attrs:
 689         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 690                        ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
 691
 692         if (temp_copy_name) {
 693                 if (do_rename(fnametmp, fname) < 0) {
 694                         rsyserr(FERROR_XFER, errno, "rename %s -> \"%s\"",
 695                                 full_fname(fnametmp), fname);
 696                         return 0;
 697                 }
 698                 handle_partial_dir(temp_copy_name, PDIR_DELETE);
 699         }
 700         return 1;
 701 }
 702
 703 struct file_list *flist_for_ndx(int ndx, const char *fatal_error_loc)
 704 {
 705         struct file_list *flist = cur_flist;
 706
 707         if (!flist && !(flist = first_flist))
 708                 goto not_found;
 709
 710         while (ndx < flist->ndx_start-1) {
 711                 if (flist == first_flist)
 712                         goto not_found;
 713                 flist = flist->prev;
 714         }
 715         while (ndx >= flist->ndx_start + flist->used) {
 716                 if (!(flist = flist->next))
 717                         goto not_found;
 718         }
 719         return flist;
 720
 721   not_found:
 722         if (fatal_error_loc) {
 723                 int first, last;
 724                 if (first_flist) {
 725                         first = first_flist->ndx_start - 1;
 726                         last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
 727                 } else {
 728                         first = 0;
 729                         last = -1;
 730                 }
 731                 rprintf(FERROR,
 732                         "File-list index %d not in %d - %d (%s) [%s]\n",
 733                         ndx, first, last, fatal_error_loc, who_am_i());
 734                 exit_cleanup(RERR_PROTOCOL);
 735         }
 736         return NULL;
 737 }
 738
 739 const char *who_am_i(void)
 740 {
 741         if (am_starting_up)
 742                 return am_server ? "server" : "client";
 743         return am_sender ? "sender"
 744              : am_generator ? "generator"
 745              : am_receiver ? "receiver"
 746              : "Receiver"; /* pre-forked receiver */
 747 }