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) 2003-2007 Wayne Davison
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 3 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License along
  19  * with this program; if not, visit the http://fsf.org website.
  20  */
  21
  22 #include "rsync.h"
  23 #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 verbose;
  31 extern int dry_run;
  32 extern int preserve_acls;
  33 extern int preserve_xattrs;
  34 extern int preserve_perms;
  35 extern int preserve_executability;
  36 extern int preserve_times;
  37 extern int am_root;
  38 extern int am_server;
  39 extern int am_sender;
  40 extern int am_generator;
  41 extern int am_starting_up;
  42 extern int allow_8bit_chars;
  43 extern int protocol_version;
  44 extern int uid_ndx;
  45 extern int gid_ndx;
  46 extern int inc_recurse;
  47 extern int inplace;
  48 extern int flist_eof;
  49 extern int keep_dirlinks;
  50 extern int make_backups;
  51 extern struct file_list *cur_flist, *first_flist, *dir_flist;
  52 extern struct chmod_mode_struct *daemon_chmod_modes;
  53 #ifdef ICONV_OPTION
  54 extern char *iconv_opt;
  55 #endif
  56
  57 #ifdef ICONV_CONST
  58 iconv_t ic_chck = (iconv_t)-1;
  59 # ifdef ICONV_OPTION
  60 iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
  61 # endif
  62
  63 static const char *default_charset(void)
  64 {
  65 # if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
  66         return locale_charset();
  67 # elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
  68         return nl_langinfo(CODESET);
  69 # else
  70         return ""; /* Works with (at the very least) gnu iconv... */
  71 # endif
  72 }
  73
  74 void setup_iconv(void)
  75 {
  76         const char *defset = default_charset();
  77 # ifdef ICONV_OPTION
  78         const char *charset;
  79         char *cp;
  80 # endif
  81
  82         if (!am_server && !allow_8bit_chars) {
  83
  84                 /* It's OK if this fails... */
  85                 ic_chck = iconv_open(defset, defset);
  86
  87                 if (verbose > 3) {
  88                         if (ic_chck == (iconv_t)-1) {
  89                                 rprintf(FINFO,
  90                                         "note: iconv_open(\"%s\", \"%s\") failed (%d)"
  91                                         " -- using isprint() instead of iconv().\n",
  92                                         defset, defset, errno);
  93                         } else {
  94                                 rprintf(FINFO,
  95                                         "note: iconv_open(\"%s\", \"%s\") succeeded.\n",
  96                                         defset, defset);
  97                         }
  98                 }
  99         }
 100
 101 # ifdef ICONV_OPTION
 102         if (!iconv_opt)
 103                 return;
 104
 105         if ((cp = strchr(iconv_opt, ',')) != NULL) {
 106                 if (am_server) /* A local transfer needs this. */
 107                         iconv_opt = cp + 1;
 108                 else
 109                         *cp = '\0';
 110         }
 111
 112         if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))
 113                 charset = defset;
 114         else
 115                 charset = iconv_opt;
 116
 117         if ((ic_send = iconv_open(UTF8_CHARSET, charset)) == (iconv_t)-1) {
 118                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 119                         UTF8_CHARSET, charset);
 120                 exit_cleanup(RERR_UNSUPPORTED);
 121         }
 122
 123         if ((ic_recv = iconv_open(charset, UTF8_CHARSET)) == (iconv_t)-1) {
 124                 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
 125                         charset, UTF8_CHARSET);
 126                 exit_cleanup(RERR_UNSUPPORTED);
 127         }
 128
 129         if (verbose > 1) {
 130                 rprintf(FINFO, "%s charset: %s\n",
 131                         am_server ? "server" : "client",
 132                         *charset ? charset : "[LOCALE]");
 133         }
 134 # endif
 135 }
 136
 137 /* This function converts the characters in the "in" xbuf into characters
 138  * in the "out" xbuf.  The "len" of the "in" xbuf is used starting from its
 139  * "pos".  The "size" of the "out" xbuf restricts how many characters can be
 140  * stored, starting at its "pos+len" position.  Note that the last byte of
 141  * the buffer is never used, which reserves space for a terminating '\0'.
 142  * We return a 0 on success or a -1 on error.  An error also sets errno to
 143  * E2BIG, EILSEQ, or EINVAL (see below); otherwise errno will be set to 0.
 144  * The "in" xbuf is altered to update "pos" and "len".  The "out" xbuf has
 145  * data appended, and its "len" incremented.   If ICB_EXPAND_OUT is set in
 146  * "flags", the "out" xbuf will also be allocated if empty, and expanded if
 147  * too small (so E2BIG will not be returned).  If ICB_INCLUDE_BAD is set in
 148  * "flags", any badly-encoded chars are included verbatim in the "out" xbuf,
 149  * so EILSEQ will not be returned.  Likewise for ICB_INCLUDE_INCOMPLETE with
 150  * respect to an incomplete multi-byte char at the end, which ensures that
 151  * EINVAL is not returned.  Anytime "in.pos" is 0 we will reset the iconv()
 152  * state prior to processing the characters. */
 153 int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
 154 {
 155         ICONV_CONST char *ibuf;
 156         size_t icnt, ocnt;
 157         char *obuf;
 158
 159         if (!out->size && flags & ICB_EXPAND_OUT)
 160                 alloc_xbuf(out, 1024);
 161
 162         if (!in->pos)
 163                 iconv(ic, NULL, 0, NULL, 0);
 164
 165         ibuf = in->buf + in->pos;
 166         icnt = in->len;
 167
 168         obuf = out->buf + (out->pos + out->len);
 169         ocnt = out->size - (out->pos + out->len) - 1;
 170
 171         while (icnt) {
 172                 while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {
 173                         if (errno == EINTR)
 174                                 continue;
 175                         if (errno == EINVAL) {
 176                                 if (!(flags & ICB_INCLUDE_INCOMPLETE))
 177                                         goto finish;
 178                         } else if (errno == EILSEQ) {
 179                                 if (!(flags & ICB_INCLUDE_BAD))
 180                                         goto finish;
 181                         } else {
 182                                 size_t opos = obuf - out->buf;
 183                                 if (!(flags & ICB_EXPAND_OUT)) {
 184                                         errno = E2BIG;
 185                                         goto finish;
 186                                 }
 187                                 realloc_xbuf(out, out->size + 1024);
 188                                 obuf = out->buf + opos;
 189                                 ocnt += 1024;
 190                                 continue;
 191                         }
 192                         *obuf++ = *ibuf++;
 193                         ocnt--, icnt--;
 194                 }
 195         }
 196
 197         errno = 0;
 198
 199   finish:
 200         in->len = icnt;
 201         in->pos = ibuf - in->buf;
 202         out->len = obuf - out->buf - out->pos;
 203
 204         return errno ? -1 : 0;
 205 }
 206 #endif
 207
 208 int read_ndx_and_attrs(int f_in, int *iflag_ptr, uchar *type_ptr,
 209                        char *buf, int *len_ptr)
 210 {
 211         int len, iflags = 0;
 212         struct file_list *flist;
 213         uchar fnamecmp_type = FNAMECMP_FNAME;
 214         int ndx;
 215
 216   read_loop:
 217         while (1) {
 218                 ndx = read_ndx(f_in);
 219
 220                 if (ndx >= 0)
 221                         break;
 222                 if (ndx == NDX_DONE)
 223                         return ndx;
 224                 if (!inc_recurse || am_sender)
 225                         goto invalid_ndx;
 226                 if (ndx == NDX_FLIST_EOF) {
 227                         flist_eof = 1;
 228                         send_msg(MSG_FLIST_EOF, "", 0, 0);
 229                         continue;
 230                 }
 231                 ndx = NDX_FLIST_OFFSET - ndx;
 232                 if (ndx < 0 || ndx >= dir_flist->used) {
 233                         ndx = NDX_FLIST_OFFSET - ndx;
 234                         rprintf(FERROR,
 235                                 "[%s] Invalid dir index: %d (%d - %d)\n",
 236                                 who_am_i(), ndx, NDX_FLIST_OFFSET,
 237                                 NDX_FLIST_OFFSET - dir_flist->used + 1);
 238                         exit_cleanup(RERR_PROTOCOL);
 239                 }
 240
 241                 /* Send everything read from f_in to msg_fd_out. */
 242                 send_msg_int(MSG_FLIST, ndx);
 243                 start_flist_forward(f_in);
 244                 if (verbose > 3) {
 245                         rprintf(FINFO, "[%s] receiving flist for dir %d\n",
 246                                 who_am_i(), ndx);
 247                 }
 248                 flist = recv_file_list(f_in);
 249                 flist->parent_ndx = ndx;
 250                 stop_flist_forward();
 251         }
 252
 253         iflags = protocol_version >= 29 ? read_shortint(f_in)
 254                    : ITEM_TRANSFER | ITEM_MISSING_DATA;
 255
 256         /* Honor the old-style keep-alive indicator. */
 257         if (protocol_version < 30
 258          && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
 259                 if (am_sender)
 260                         maybe_send_keepalive();
 261                 goto read_loop;
 262         }
 263
 264         if (!(flist = flist_for_ndx(ndx))) {
 265           invalid_ndx:
 266                 rprintf(FERROR,
 267                         "Invalid file index: %d (%d - %d) with iflags %x [%s]\n",
 268                         ndx, first_flist ? first_flist->ndx_start - 1 : -1,
 269                         first_flist ? first_flist->prev->ndx_end : -1,
 270                         iflags, who_am_i());
 271                 exit_cleanup(RERR_PROTOCOL);
 272         }
 273         cur_flist = flist;
 274
 275         if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
 276                 fnamecmp_type = read_byte(f_in);
 277         *type_ptr = fnamecmp_type;
 278
 279         if (iflags & ITEM_XNAME_FOLLOWS) {
 280                 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
 281                         exit_cleanup(RERR_PROTOCOL);
 282         } else {
 283                 *buf = '\0';
 284                 len = -1;
 285         }
 286         *len_ptr = len;
 287
 288         if (iflags & ITEM_TRANSFER) {
 289                 int i = ndx - cur_flist->ndx_start;
 290                 if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {
 291                         rprintf(FERROR,
 292                                 "received request to transfer non-regular file: %d [%s]\n",
 293                                 ndx, who_am_i());
 294                         exit_cleanup(RERR_PROTOCOL);
 295                 }
 296         }
 297
 298         *iflag_ptr = iflags;
 299         return ndx;
 300 }
 301
 302 /*
 303   free a sums struct
 304   */
 305 void free_sums(struct sum_struct *s)
 306 {
 307         if (s->sums) free(s->sums);
 308         free(s);
 309 }
 310
 311 /* This is only called when we aren't preserving permissions.  Figure out what
 312  * the permissions should be and return them merged back into the mode. */
 313 mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
 314                  int exists)
 315 {
 316         int new_mode;
 317         /* If the file already exists, we'll return the local permissions,
 318          * possibly tweaked by the --executability option. */
 319         if (exists) {
 320                 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
 321                 if (preserve_executability && S_ISREG(flist_mode)) {
 322                         /* If the source file is executable, grant execute
 323                          * rights to everyone who can read, but ONLY if the
 324                          * file isn't already executable. */
 325                         if (!(flist_mode & 0111))
 326                                 new_mode &= ~0111;
 327                         else if (!(stat_mode & 0111))
 328                                 new_mode |= (new_mode & 0444) >> 2;
 329                 }
 330         } else {
 331                 /* Apply destination default permissions and turn
 332                  * off special permissions. */
 333                 new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
 334         }
 335         return new_mode;
 336 }
 337
 338 int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
 339                    const char *fnamecmp, int flags)
 340 {
 341         int updated = 0;
 342         stat_x sx2;
 343         int change_uid, change_gid;
 344         mode_t new_mode = file->mode;
 345         int inherit;
 346
 347         if (!sxp) {
 348                 if (dry_run)
 349                         return 1;
 350                 if (link_stat(fname, &sx2.st, 0) < 0) {
 351                         rsyserr(FERROR, errno, "stat %s failed",
 352                                 full_fname(fname));
 353                         return 0;
 354                 }
 355 #ifdef SUPPORT_ACLS
 356                 sx2.acc_acl = sx2.def_acl = NULL;
 357 #endif
 358 #ifdef SUPPORT_XATTRS
 359                 sx2.xattr = NULL;
 360 #endif
 361                 sxp = &sx2;
 362                 inherit = !preserve_perms;
 363         } else
 364                 inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;
 365
 366         if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
 367                 /* We just created this directory and its setgid
 368                  * bit is on, so make sure it stays on. */
 369                 new_mode |= S_ISGID;
 370         }
 371
 372 #ifdef SUPPORT_ACLS
 373         if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
 374                 get_acl(fname, sxp);
 375 #endif
 376
 377 #ifdef SUPPORT_XATTRS
 378         if (preserve_xattrs && fnamecmp)
 379                 set_xattr(fname, file, fnamecmp, sxp);
 380         if (am_root < 0)
 381                 set_stat_xattr(fname, file);
 382 #endif
 383
 384         if (!preserve_times || (S_ISDIR(sxp->st.st_mode) && preserve_times == 1))
 385                 flags |= ATTRS_SKIP_MTIME;
 386         if (!(flags & ATTRS_SKIP_MTIME)
 387             && cmp_time(sxp->st.st_mtime, file->modtime) != 0) {
 388                 int ret = set_modtime(fname, file->modtime, sxp->st.st_mode);
 389                 if (ret < 0) {
 390                         rsyserr(FERROR, errno, "failed to set times on %s",
 391                                 full_fname(fname));
 392                         goto cleanup;
 393                 }
 394                 if (ret == 0) /* ret == 1 if symlink could not be set */
 395                         updated = 1;
 396         }
 397
 398         change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
 399         change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
 400                   && sxp->st.st_gid != (gid_t)F_GROUP(file);
 401 #if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK
 402         if (S_ISLNK(sxp->st.st_mode)) {
 403                 ;
 404         } else
 405 #endif
 406         if (change_uid || change_gid) {
 407                 if (verbose > 2) {
 408                         if (change_uid) {
 409                                 rprintf(FINFO,
 410                                         "set uid of %s from %u to %u\n",
 411                                         fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
 412                         }
 413                         if (change_gid) {
 414                                 rprintf(FINFO,
 415                                         "set gid of %s from %u to %u\n",
 416                                         fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
 417                         }
 418                 }
 419                 if (am_root < 0) {
 420                         ;
 421                 } else if (do_lchown(fname,
 422                     change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid,
 423                     change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid) != 0) {
 424                         /* shouldn't have attempted to change uid or gid
 425                          * unless have the privilege */
 426                         rsyserr(FERROR, errno, "%s %s failed",
 427                             change_uid ? "chown" : "chgrp",
 428                             full_fname(fname));
 429                         goto cleanup;
 430                 } else
 431                 /* a lchown had been done - we have to re-stat if the
 432                  * destination had the setuid or setgid bits set due
 433                  * to the side effect of the chown call */
 434                 if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
 435                         link_stat(fname, &sxp->st,
 436                                   keep_dirlinks && S_ISDIR(sxp->st.st_mode));
 437                 }
 438                 updated = 1;
 439         }
 440
 441         if (daemon_chmod_modes && !S_ISLNK(new_mode))
 442                 new_mode = tweak_mode(new_mode, daemon_chmod_modes);
 443
 444 #ifdef SUPPORT_ACLS
 445         /* It's OK to call set_acl() now, even for a dir, as the generator
 446          * will enable owner-writability using chmod, if necessary.
 447          *
 448          * If set_acl() changes permission bits in the process of setting
 449          * an access ACL, it changes sxp->st.st_mode so we know whether we
 450          * need to chmod(). */
 451         if (preserve_acls && !S_ISLNK(new_mode) && set_acl(fname, file, sxp) == 0)
 452                 updated = 1;
 453 #endif
 454
 455 #ifdef HAVE_CHMOD
 456         if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
 457                 int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
 458                 if (ret < 0) {
 459                         rsyserr(FERROR, errno,
 460                                 "failed to set permissions on %s",
 461                                 full_fname(fname));
 462                         goto cleanup;
 463                 }
 464                 if (ret == 0) /* ret == 1 if symlink could not be set */
 465                         updated = 1;
 466         }
 467 #endif
 468
 469         if (verbose > 1 && flags & ATTRS_REPORT) {
 470                 if (updated)
 471                         rprintf(FCLIENT, "%s\n", fname);
 472                 else
 473                         rprintf(FCLIENT, "%s is uptodate\n", fname);
 474         }
 475   cleanup:
 476         if (sxp == &sx2) {
 477 #ifdef SUPPORT_ACLS
 478                 if (preserve_acls)
 479                         free_acl(&sx2);
 480 #endif
 481 #ifdef SUPPORT_XATTRS
 482                 if (preserve_xattrs)
 483                         free_xattr(&sx2);
 484 #endif
 485         }
 486         return updated;
 487 }
 488
 489 RETSIGTYPE sig_int(UNUSED(int val))
 490 {
 491         /* KLUGE: if the user hits Ctrl-C while ssh is prompting
 492          * for a password, then our cleanup's sending of a SIGUSR1
 493          * signal to all our children may kill ssh before it has a
 494          * chance to restore the tty settings (i.e. turn echo back
 495          * on).  By sleeping for a short time, ssh gets a bigger
 496          * chance to do the right thing.  If child processes are
 497          * not ssh waiting for a password, then this tiny delay
 498          * shouldn't hurt anything. */
 499         msleep(400);
 500         exit_cleanup(RERR_SIGNAL);
 501 }
 502
 503 /* Finish off a file transfer: renaming the file and setting the file's
 504  * attributes (e.g. permissions, ownership, etc.).  If partialptr is not
 505  * NULL and the robust_rename() call is forced to copy the temp file, we
 506  * stage the file into the partial-dir and then rename it into place. */
 507 void finish_transfer(const char *fname, const char *fnametmp,
 508                      const char *fnamecmp, const char *partialptr,
 509                      struct file_struct *file, int ok_to_set_time,
 510                      int overwriting_basis)
 511 {
 512         int ret;
 513
 514         if (inplace) {
 515                 if (verbose > 2)
 516                         rprintf(FINFO, "finishing %s\n", fname);
 517                 fnametmp = fname;
 518                 goto do_set_file_attrs;
 519         }
 520
 521         if (make_backups > 0 && overwriting_basis && !make_backup(fname))
 522                 return;
 523
 524         /* Change permissions before putting the file into place. */
 525         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 526                        ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
 527
 528         /* move tmp file over real file */
 529         if (verbose > 2)
 530                 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
 531         ret = robust_rename(fnametmp, fname, partialptr,
 532                             file->mode & INITACCESSPERMS);
 533         if (ret < 0) {
 534                 rsyserr(FERROR, errno, "%s %s -> \"%s\"",
 535                         ret == -2 ? "copy" : "rename",
 536                         full_fname(fnametmp), fname);
 537                 do_unlink(fnametmp);
 538                 return;
 539         }
 540         if (ret == 0) {
 541                 /* The file was moved into place (not copied), so it's done. */
 542                 return;
 543         }
 544         /* The file was copied, so tweak the perms of the copied file.  If it
 545          * was copied to partialptr, move it into its final destination. */
 546         fnametmp = partialptr ? partialptr : fname;
 547
 548   do_set_file_attrs:
 549         set_file_attrs(fnametmp, file, NULL, fnamecmp,
 550                        ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
 551
 552         if (partialptr) {
 553                 if (do_rename(fnametmp, fname) < 0) {
 554                         rsyserr(FERROR, errno, "rename %s -> \"%s\"",
 555                                 full_fname(fnametmp), fname);
 556                 } else
 557                         handle_partial_dir(partialptr, PDIR_DELETE);
 558         }
 559 }
 560
 561 struct file_list *flist_for_ndx(int ndx)
 562 {
 563         struct file_list *flist = cur_flist;
 564
 565         if (!flist && !(flist = first_flist))
 566                 return NULL;
 567
 568         while (ndx < flist->ndx_start-1) {
 569                 if (flist == first_flist)
 570                         return NULL;
 571                 flist = flist->prev;
 572         }
 573         while (ndx > flist->ndx_end) {
 574                 if (!(flist = flist->next))
 575                         return NULL;
 576         }
 577         return flist;
 578 }
 579
 580 const char *who_am_i(void)
 581 {
 582         if (am_starting_up)
 583                 return am_server ? "server" : "client";
 584         return am_sender ? "sender" : am_generator ? "generator" : "receiver";
 585 }