2 * Routines common to more than one of the rsync processes.
4 * Copyright (C) 1996 Andrew Tridgell
5 * Copyright (C) 1996 Paul Mackerras
6 * Copyright (C) 2003-2008 Wayne Davison
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.
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.
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.
24 #if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
25 #include <libcharset.h>
26 #elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
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;
40 extern int am_generator;
41 extern int am_starting_up;
42 extern int allow_8bit_chars;
43 extern int protocol_version;
46 extern int inc_recurse;
49 extern int keep_dirlinks;
50 extern int make_backups;
51 extern int delete_during;
52 extern int check_for_io_err;
53 extern struct file_list *cur_flist, *first_flist, *dir_flist;
54 extern struct chmod_mode_struct *daemon_chmod_modes;
56 extern char *iconv_opt;
60 iconv_t ic_chck = (iconv_t)-1;
62 iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
65 static const char *default_charset(void)
67 # if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
68 return locale_charset();
69 # elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
70 return nl_langinfo(CODESET);
72 return ""; /* Works with (at the very least) gnu iconv... */
76 void setup_iconv(void)
78 const char *defset = default_charset();
84 if (!am_server && !allow_8bit_chars) {
86 /* It's OK if this fails... */
87 ic_chck = iconv_open(defset, defset);
90 if (ic_chck == (iconv_t)-1) {
92 "note: iconv_open(\"%s\", \"%s\") failed (%d)"
93 " -- using isprint() instead of iconv().\n",
94 defset, defset, errno);
97 "note: iconv_open(\"%s\", \"%s\") succeeded.\n",
107 if ((cp = strchr(iconv_opt, ',')) != NULL) {
108 if (am_server) /* A local transfer needs this. */
114 if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))
119 if ((ic_send = iconv_open(UTF8_CHARSET, charset)) == (iconv_t)-1) {
120 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
121 UTF8_CHARSET, charset);
122 exit_cleanup(RERR_UNSUPPORTED);
125 if ((ic_recv = iconv_open(charset, UTF8_CHARSET)) == (iconv_t)-1) {
126 rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
127 charset, UTF8_CHARSET);
128 exit_cleanup(RERR_UNSUPPORTED);
132 rprintf(FINFO, "%s charset: %s\n",
133 am_server ? "server" : "client",
134 *charset ? charset : "[LOCALE]");
139 /* This function converts the characters in the "in" xbuf into characters
140 * in the "out" xbuf. The "len" of the "in" xbuf is used starting from its
141 * "pos". The "size" of the "out" xbuf restricts how many characters can be
142 * stored, starting at its "pos+len" position. Note that the last byte of
143 * the buffer is never used, which reserves space for a terminating '\0'.
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. If ICB_EXPAND_OUT is set in
148 * "flags", the "out" xbuf will also be allocated if empty, and expanded if
149 * too small (so E2BIG will not be returned). If ICB_INCLUDE_BAD is set in
150 * "flags", any badly-encoded chars are included verbatim in the "out" xbuf,
151 * so EILSEQ will not be returned. Likewise for ICB_INCLUDE_INCOMPLETE with
152 * respect to an incomplete multi-byte char at the end, which ensures that
153 * EINVAL is not returned. Anytime "in.pos" is 0 we will reset the iconv()
154 * state prior to processing the characters. */
155 int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
157 ICONV_CONST char *ibuf;
161 if (!out->size && flags & ICB_EXPAND_OUT)
162 alloc_xbuf(out, 1024);
165 iconv(ic, NULL, 0, NULL, 0);
167 ibuf = in->buf + in->pos;
170 obuf = out->buf + (out->pos + out->len);
171 ocnt = out->size - (out->pos + out->len) - 1;
174 while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {
177 if (errno == EINVAL) {
178 if (!(flags & ICB_INCLUDE_INCOMPLETE))
180 } else if (errno == EILSEQ) {
181 if (!(flags & ICB_INCLUDE_BAD))
184 size_t opos = obuf - out->buf;
185 if (!(flags & ICB_EXPAND_OUT)) {
189 realloc_xbuf(out, out->size + 1024);
190 obuf = out->buf + opos;
203 in->pos = ibuf - in->buf;
204 out->len = obuf - out->buf - out->pos;
206 return errno ? -1 : 0;
210 void send_protected_args(int fd, char *args[])
214 int convert = ic_send != (iconv_t)-1;
218 alloc_xbuf(&outbuf, 1024);
221 for (i = 0; args[i]; i++) {} /* find first NULL */
222 args[i] = "rsync"; /* set a new arg0 */
224 print_child_argv("protected args:", args + i + 1);
228 INIT_XBUF_STRLEN(inbuf, args[i]);
229 iconvbufs(ic_send, &inbuf, &outbuf,
230 ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
231 outbuf.buf[outbuf.len] = '\0';
232 write_buf(fd, outbuf.buf, outbuf.len + 1);
236 write_buf(fd, args[i], strlen(args[i]) + 1);
246 int read_ndx_and_attrs(int f_in, int *iflag_ptr, uchar *type_ptr,
247 char *buf, int *len_ptr)
250 struct file_list *flist;
251 uchar fnamecmp_type = FNAMECMP_FNAME;
252 int ndx, save_verbose = verbose;
256 ndx = read_ndx(f_in);
259 if (check_for_io_err) {
260 /* Let generator know there was no I/O error. */
261 send_msg_int(MSG_IO_ERROR, 0);
262 check_for_io_err = 0;
266 check_for_io_err = 0;
269 if (!inc_recurse || am_sender)
271 if (ndx == NDX_FLIST_EOF) {
273 send_msg(MSG_FLIST_EOF, "", 0, 0);
276 ndx = NDX_FLIST_OFFSET - ndx;
277 if (ndx < 0 || ndx >= dir_flist->used) {
278 ndx = NDX_FLIST_OFFSET - ndx;
280 "[%s] Invalid dir index: %d (%d - %d)\n",
281 who_am_i(), ndx, NDX_FLIST_OFFSET,
282 NDX_FLIST_OFFSET - dir_flist->used + 1);
283 exit_cleanup(RERR_PROTOCOL);
286 /* Send everything read from f_in to msg_fd_out. */
288 rprintf(FINFO, "[%s] receiving flist for dir %d\n",
292 send_msg_int(MSG_FLIST, ndx);
293 start_flist_forward(f_in);
294 flist = recv_file_list(f_in);
295 flist->parent_ndx = ndx;
296 stop_flist_forward();
297 verbose = save_verbose;
298 /* If the sender is going to send us an MSG_IO_ERROR value, it
299 * will always be the very next message following a file list. */
301 check_for_io_err = 1;
304 iflags = protocol_version >= 29 ? read_shortint(f_in)
305 : ITEM_TRANSFER | ITEM_MISSING_DATA;
307 /* Honor the old-style keep-alive indicator. */
308 if (protocol_version < 30
309 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
311 maybe_send_keepalive();
315 if (!(flist = flist_for_ndx(ndx))) {
318 start = first_flist ? first_flist->ndx_start : 0;
319 used = first_flist ? first_flist->used : 0;
321 "Invalid file index: %d (%d - %d) with iflags %x [%s]\n",
322 ndx, start - 1, start + used -1, iflags, who_am_i());
323 exit_cleanup(RERR_PROTOCOL);
327 if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
328 fnamecmp_type = read_byte(f_in);
329 *type_ptr = fnamecmp_type;
331 if (iflags & ITEM_XNAME_FOLLOWS) {
332 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
333 exit_cleanup(RERR_PROTOCOL);
340 if (iflags & ITEM_TRANSFER) {
341 int i = ndx - cur_flist->ndx_start;
342 if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {
344 "received request to transfer non-regular file: %d [%s]\n",
346 exit_cleanup(RERR_PROTOCOL);
357 void free_sums(struct sum_struct *s)
359 if (s->sums) free(s->sums);
363 /* This is only called when we aren't preserving permissions. Figure out what
364 * the permissions should be and return them merged back into the mode. */
365 mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
369 /* If the file already exists, we'll return the local permissions,
370 * possibly tweaked by the --executability option. */
372 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
373 if (preserve_executability && S_ISREG(flist_mode)) {
374 /* If the source file is executable, grant execute
375 * rights to everyone who can read, but ONLY if the
376 * file isn't already executable. */
377 if (!(flist_mode & 0111))
379 else if (!(stat_mode & 0111))
380 new_mode |= (new_mode & 0444) >> 2;
383 /* Apply destination default permissions and turn
384 * off special permissions. */
385 new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
390 int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
391 const char *fnamecmp, int flags)
395 int change_uid, change_gid;
396 mode_t new_mode = file->mode;
402 if (link_stat(fname, &sx2.st, 0) < 0) {
403 rsyserr(FERROR_XFER, errno, "stat %s failed",
408 sx2.acc_acl = sx2.def_acl = NULL;
410 #ifdef SUPPORT_XATTRS
414 inherit = !preserve_perms;
416 inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;
418 if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
419 /* We just created this directory and its setgid
420 * bit is on, so make sure it stays on. */
424 if (daemon_chmod_modes && !S_ISLNK(new_mode))
425 new_mode = tweak_mode(new_mode, daemon_chmod_modes);
428 if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
432 #ifdef SUPPORT_XATTRS
434 set_stat_xattr(fname, file, new_mode);
435 if (preserve_xattrs && fnamecmp)
436 set_xattr(fname, file, fnamecmp, sxp);
439 if (!preserve_times || (S_ISDIR(sxp->st.st_mode) && preserve_times == 1))
440 flags |= ATTRS_SKIP_MTIME;
441 if (!(flags & ATTRS_SKIP_MTIME)
442 && cmp_time(sxp->st.st_mtime, file->modtime) != 0) {
443 int ret = set_modtime(fname, file->modtime, sxp->st.st_mode);
445 rsyserr(FERROR_XFER, errno, "failed to set times on %s",
449 if (ret == 0) /* ret == 1 if symlink could not be set */
452 file->flags |= FLAG_TIME_FAILED;
455 change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
456 change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
457 && sxp->st.st_gid != (gid_t)F_GROUP(file);
458 #if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK
459 if (S_ISLNK(sxp->st.st_mode)) {
463 if (change_uid || change_gid) {
467 "set uid of %s from %u to %u\n",
468 fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
472 "set gid of %s from %u to %u\n",
473 fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
478 change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid,
479 change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid) != 0) {
480 /* We shouldn't have attempted to change uid
481 * or gid unless have the privilege. */
482 rsyserr(FERROR_XFER, errno, "%s %s failed",
483 change_uid ? "chown" : "chgrp",
487 /* A lchown had been done, so we need to re-stat if
488 * the destination had the setuid or setgid bits set
489 * (due to the side effect of the chown call). */
490 if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
491 link_stat(fname, &sxp->st,
492 keep_dirlinks && S_ISDIR(sxp->st.st_mode));
499 /* It's OK to call set_acl() now, even for a dir, as the generator
500 * will enable owner-writability using chmod, if necessary.
502 * If set_acl() changes permission bits in the process of setting
503 * an access ACL, it changes sxp->st.st_mode so we know whether we
504 * need to chmod(). */
505 if (preserve_acls && !S_ISLNK(new_mode) && set_acl(fname, file, sxp) == 0)
510 if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
511 int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
513 rsyserr(FERROR_XFER, errno,
514 "failed to set permissions on %s",
518 if (ret == 0) /* ret == 1 if symlink could not be set */
523 if (verbose > 1 && flags & ATTRS_REPORT) {
525 rprintf(FCLIENT, "%s\n", fname);
527 rprintf(FCLIENT, "%s is uptodate\n", fname);
535 #ifdef SUPPORT_XATTRS
543 RETSIGTYPE sig_int(UNUSED(int val))
545 /* KLUGE: if the user hits Ctrl-C while ssh is prompting
546 * for a password, then our cleanup's sending of a SIGUSR1
547 * signal to all our children may kill ssh before it has a
548 * chance to restore the tty settings (i.e. turn echo back
549 * on). By sleeping for a short time, ssh gets a bigger
550 * chance to do the right thing. If child processes are
551 * not ssh waiting for a password, then this tiny delay
552 * shouldn't hurt anything. */
554 exit_cleanup(RERR_SIGNAL);
557 /* Finish off a file transfer: renaming the file and setting the file's
558 * attributes (e.g. permissions, ownership, etc.). If the robust_rename()
559 * call is forced to copy the temp file and partialptr is both non-NULL and
560 * not an absolute path, we stage the file into the partial-dir and then
561 * rename it into place. This returns 1 on succcess or 0 on failure. */
562 int finish_transfer(const char *fname, const char *fnametmp,
563 const char *fnamecmp, const char *partialptr,
564 struct file_struct *file, int ok_to_set_time,
565 int overwriting_basis)
568 const char *temp_copy_name = partialptr && *partialptr != '/' ? partialptr : NULL;
572 rprintf(FINFO, "finishing %s\n", fname);
574 goto do_set_file_attrs;
577 if (make_backups > 0 && overwriting_basis) {
578 if (!make_backup(fname))
580 if (fnamecmp == fname)
581 fnamecmp = get_backup_name(fname);
584 /* Change permissions before putting the file into place. */
585 set_file_attrs(fnametmp, file, NULL, fnamecmp,
586 ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
588 /* move tmp file over real file */
590 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
591 ret = robust_rename(fnametmp, fname, temp_copy_name,
592 file->mode & INITACCESSPERMS);
594 rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"",
595 ret == -2 ? "copy" : "rename",
596 full_fname(fnametmp), fname);
597 if (!partialptr || (ret == -2 && temp_copy_name)
598 || robust_rename(fnametmp, partialptr, NULL,
599 file->mode & INITACCESSPERMS) < 0)
604 /* The file was moved into place (not copied), so it's done. */
607 /* The file was copied, so tweak the perms of the copied file. If it
608 * was copied to partialptr, move it into its final destination. */
609 fnametmp = temp_copy_name ? temp_copy_name : fname;
612 set_file_attrs(fnametmp, file, NULL, fnamecmp,
613 ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
615 if (temp_copy_name) {
616 if (do_rename(fnametmp, fname) < 0) {
617 rsyserr(FERROR_XFER, errno, "rename %s -> \"%s\"",
618 full_fname(fnametmp), fname);
621 handle_partial_dir(temp_copy_name, PDIR_DELETE);
626 struct file_list *flist_for_ndx(int ndx)
628 struct file_list *flist = cur_flist;
630 if (!flist && !(flist = first_flist))
633 while (ndx < flist->ndx_start-1) {
634 if (flist == first_flist)
638 while (ndx >= flist->ndx_start + flist->used) {
639 if (!(flist = flist->next))
645 const char *who_am_i(void)
648 return am_server ? "server" : "client";
649 return am_sender ? "sender" : am_generator ? "generator" : "receiver";