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) 2003-2009 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
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;
39 extern int am_generator;
40 extern int am_starting_up;
41 extern int allow_8bit_chars;
42 extern int protocol_version;
45 extern int inc_recurse;
48 extern int file_old_total;
49 extern int msgs2stderr;
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;
55 extern char *iconv_opt;
59 iconv_t ic_chck = (iconv_t)-1;
61 iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
64 static const char *default_charset(void)
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);
71 return ""; /* Works with (at the very least) gnu iconv... */
75 void setup_iconv(void)
77 const char *defset = default_charset();
83 if (!am_server && !allow_8bit_chars) {
84 /* It's OK if this fails... */
85 ic_chck = iconv_open(defset, defset);
87 if (DEBUG_GTE(ICONV, 2)) {
88 if (ic_chck == (iconv_t)-1) {
90 "msg checking via isprint()"
91 " (iconv_open(\"%s\", \"%s\") errno: %d)\n",
92 defset, defset, errno);
95 "msg checking charset: %s\n",
100 ic_chck = (iconv_t)-1;
106 if ((cp = strchr(iconv_opt, ',')) != NULL) {
107 if (am_server) /* A local transfer needs this. */
113 if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))
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);
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);
130 if (DEBUG_GTE(ICONV, 1)) {
131 rprintf(FINFO, "[%s] charset: %s\n",
132 who_am_i(), *charset ? charset : "[LOCALE]");
137 /* Move any bytes in the overflow space to the start. This avoids any issue
138 * with a multibyte sequence that needs to span the end of the buffer. */
139 static void wrap_overflow(xbuf *out, int siz)
141 if (DEBUG_GTE(IO, 4))
142 rprintf(FINFO, "[%s] wrap-bytes moved: %d (iconvbufs)\n", who_am_i(), siz);
143 memcpy(out->buf, out->buf + out->size, siz);
146 /* This function converts the characters in the "in" xbuf into characters
147 * in the "out" xbuf. The "len" of the "in" xbuf is used starting from its
148 * "pos". The "size" of the "out" xbuf restricts how many characters can be
149 * stored, starting at its "pos+len" position. Note that the last byte of
150 * the buffer is never used, which reserves space for a terminating '\0'.
151 * If ICB_CIRCULAR_OUT is set, the output data can wrap around to the start,
152 * and the buf IS ASSUMED TO HAVE AN EXTRA 4 BYTES OF OVERFLOW SPACE at the
153 * end (the buffer will also not be expanded if it is already allocated).
154 * We return a 0 on success or a -1 on error. An error also sets errno to
155 * E2BIG, EILSEQ, or EINVAL (see below); otherwise errno will be set to 0.
156 * The "in" xbuf is altered to update "pos" and "len". The "out" xbuf has
157 * data appended, and its "len" incremented. If ICB_EXPAND_OUT is set in
158 * "flags", the "out" xbuf will also be allocated if empty, and expanded if
159 * too small (so E2BIG will not be returned). If ICB_INCLUDE_BAD is set in
160 * "flags", any badly-encoded chars are included verbatim in the "out" xbuf,
161 * so EILSEQ will not be returned. Likewise for ICB_INCLUDE_INCOMPLETE with
162 * respect to an incomplete multi-byte char at the end, which ensures that
163 * EINVAL is not returned. Anytime "in.pos" is 0 we will reset the iconv()
164 * state prior to processing the characters. */
165 int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
167 ICONV_CONST char *ibuf;
168 size_t icnt, ocnt, opos;
171 if (!out->size && flags & ICB_EXPAND_OUT)
172 alloc_xbuf(out, 1024);
175 iconv(ic, NULL, 0, NULL, 0);
177 ibuf = in->buf + in->pos;
180 opos = out->pos + out->len;
181 if (flags & ICB_CIRCULAR_OUT) {
182 if (opos >= out->size) {
184 ocnt = out->pos - opos - 1;
186 /* We only make use of the 4 bytes of overflow buffer
187 * if there is room to move the bytes to the start of
188 * the circular buffer. */
189 ocnt = out->size - opos + MIN((ssize_t)out->pos - 1, 4);
192 ocnt = out->size - opos - 1;
193 obuf = out->buf + opos;
196 while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {
199 if (errno == EINVAL) {
200 if (!(flags & ICB_INCLUDE_INCOMPLETE))
202 } else if (errno == EILSEQ) {
203 if (!(flags & ICB_INCLUDE_BAD))
206 opos = obuf - out->buf;
207 if (flags & ICB_CIRCULAR_OUT && opos > out->size) {
208 wrap_overflow(out, opos -= out->size);
209 obuf = out->buf + opos;
210 if ((ocnt = out->pos - opos - 1) > 0)
213 if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
217 realloc_xbuf(out, out->size + 1024);
218 obuf = out->buf + opos;
230 opos = obuf - out->buf;
231 if (flags & ICB_CIRCULAR_OUT) {
232 if (opos > out->size)
233 wrap_overflow(out, opos - out->size);
234 else if (opos < out->pos)
237 out->len = opos - out->pos;
240 in->pos = ibuf - in->buf;
242 return errno ? -1 : 0;
246 void send_protected_args(int fd, char *args[])
250 int convert = ic_send != (iconv_t)-1;
254 alloc_xbuf(&outbuf, 1024);
257 for (i = 0; args[i]; i++) {} /* find first NULL */
258 args[i] = "rsync"; /* set a new arg0 */
259 if (DEBUG_GTE(CMD, 1))
260 print_child_argv("protected args:", args + i + 1);
263 write_buf(fd, ".", 2);
266 INIT_XBUF_STRLEN(inbuf, args[i]);
267 iconvbufs(ic_send, &inbuf, &outbuf,
268 ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE);
269 outbuf.buf[outbuf.len] = '\0';
270 write_buf(fd, outbuf.buf, outbuf.len + 1);
275 write_buf(fd, args[i], strlen(args[i]) + 1);
285 int read_ndx_and_attrs(int f_in, int f_out, int *iflag_ptr, uchar *type_ptr,
286 char *buf, int *len_ptr)
289 struct file_list *flist;
290 uchar fnamecmp_type = FNAMECMP_FNAME;
295 ndx = read_ndx(f_in);
301 if (ndx == NDX_DEL_STATS) {
302 read_del_stats(f_in);
303 if (am_sender && am_server)
304 write_del_stats(f_out);
307 if (!inc_recurse || am_sender) {
310 last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
314 "Invalid file index: %d (%d - %d) [%s]\n",
315 ndx, NDX_DONE, last, who_am_i());
316 exit_cleanup(RERR_PROTOCOL);
318 if (ndx == NDX_FLIST_EOF) {
320 if (DEBUG_GTE(FLIST, 3))
321 rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
322 write_int(f_out, NDX_FLIST_EOF);
325 ndx = NDX_FLIST_OFFSET - ndx;
326 if (ndx < 0 || ndx >= dir_flist->used) {
327 ndx = NDX_FLIST_OFFSET - ndx;
329 "Invalid dir index: %d (%d - %d) [%s]\n",
330 ndx, NDX_FLIST_OFFSET,
331 NDX_FLIST_OFFSET - dir_flist->used + 1,
333 exit_cleanup(RERR_PROTOCOL);
336 if (DEBUG_GTE(FLIST, 2)) {
337 rprintf(FINFO, "[%s] receiving flist for dir %d\n",
340 /* Send all the data we read for this flist to the generator. */
341 start_flist_forward(ndx);
342 flist = recv_file_list(f_in);
343 flist->parent_ndx = ndx;
344 stop_flist_forward();
347 iflags = protocol_version >= 29 ? read_shortint(f_in)
348 : ITEM_TRANSFER | ITEM_MISSING_DATA;
350 /* Honor the old-style keep-alive indicator. */
351 if (protocol_version < 30
352 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
354 maybe_send_keepalive();
358 flist = flist_for_ndx(ndx, "read_ndx_and_attrs");
359 if (flist != cur_flist) {
362 file_old_total = cur_flist->used;
363 for (flist = first_flist; flist != cur_flist; flist = flist->next)
364 file_old_total += flist->used;
368 if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
369 fnamecmp_type = read_byte(f_in);
370 *type_ptr = fnamecmp_type;
372 if (iflags & ITEM_XNAME_FOLLOWS) {
373 if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
374 exit_cleanup(RERR_PROTOCOL);
381 if (iflags & ITEM_TRANSFER) {
382 int i = ndx - cur_flist->ndx_start;
383 if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {
385 "received request to transfer non-regular file: %d [%s]\n",
387 exit_cleanup(RERR_PROTOCOL);
398 void free_sums(struct sum_struct *s)
400 if (s->sums) free(s->sums);
404 /* This is only called when we aren't preserving permissions. Figure out what
405 * the permissions should be and return them merged back into the mode. */
406 mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
410 /* If the file already exists, we'll return the local permissions,
411 * possibly tweaked by the --executability option. */
413 new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
414 if (preserve_executability && S_ISREG(flist_mode)) {
415 /* If the source file is executable, grant execute
416 * rights to everyone who can read, but ONLY if the
417 * file isn't already executable. */
418 if (!(flist_mode & 0111))
420 else if (!(stat_mode & 0111))
421 new_mode |= (new_mode & 0444) >> 2;
424 /* Apply destination default permissions and turn
425 * off special permissions. */
426 new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
431 int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
432 const char *fnamecmp, int flags)
436 int change_uid, change_gid;
437 mode_t new_mode = file->mode;
443 if (link_stat(fname, &sx2.st, 0) < 0) {
444 rsyserr(FERROR_XFER, errno, "stat %s failed",
450 inherit = !preserve_perms;
452 inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;
454 if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
455 /* We just created this directory and its setgid
456 * bit is on, so make sure it stays on. */
460 if (daemon_chmod_modes && !S_ISLNK(new_mode))
461 new_mode = tweak_mode(new_mode, daemon_chmod_modes);
464 if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
468 #ifdef SUPPORT_XATTRS
470 set_stat_xattr(fname, file, new_mode);
471 if (preserve_xattrs && fnamecmp)
472 set_xattr(fname, file, fnamecmp, sxp);
475 if (!preserve_times || (S_ISDIR(sxp->st.st_mode) && preserve_times == 1))
476 flags |= ATTRS_SKIP_MTIME;
477 if (!(flags & ATTRS_SKIP_MTIME)
478 && cmp_time(sxp->st.st_mtime, file->modtime) != 0) {
479 int ret = set_modtime(fname, file->modtime, F_MOD_NSEC(file), sxp->st.st_mode);
481 rsyserr(FERROR_XFER, errno, "failed to set times on %s",
485 if (ret == 0) /* ret == 1 if symlink could not be set */
488 file->flags |= FLAG_TIME_FAILED;
491 change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
492 change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
493 && sxp->st.st_gid != (gid_t)F_GROUP(file);
494 #if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK
495 if (S_ISLNK(sxp->st.st_mode)) {
499 if (change_uid || change_gid) {
500 if (DEBUG_GTE(OWN, 1)) {
503 "set uid of %s from %u to %u\n",
504 fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
508 "set gid of %s from %u to %u\n",
509 fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
514 change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid,
515 change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid) != 0) {
516 /* We shouldn't have attempted to change uid
517 * or gid unless have the privilege. */
518 rsyserr(FERROR_XFER, errno, "%s %s failed",
519 change_uid ? "chown" : "chgrp",
523 /* A lchown had been done, so we need to re-stat if
524 * the destination had the setuid or setgid bits set
525 * (due to the side effect of the chown call). */
526 if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
527 link_stat(fname, &sxp->st,
528 keep_dirlinks && S_ISDIR(sxp->st.st_mode));
535 /* It's OK to call set_acl() now, even for a dir, as the generator
536 * will enable owner-writability using chmod, if necessary.
538 * If set_acl() changes permission bits in the process of setting
539 * an access ACL, it changes sxp->st.st_mode so we know whether we
540 * need to chmod(). */
541 if (preserve_acls && !S_ISLNK(new_mode)) {
542 if (set_acl(fname, file, sxp, new_mode) > 0)
548 if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
549 int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
551 rsyserr(FERROR_XFER, errno,
552 "failed to set permissions on %s",
556 if (ret == 0) /* ret == 1 if symlink could not be set */
561 if (INFO_GTE(NAME, 2) && flags & ATTRS_REPORT) {
563 rprintf(FCLIENT, "%s\n", fname);
565 rprintf(FCLIENT, "%s is uptodate\n", fname);
573 #ifdef SUPPORT_XATTRS
581 RETSIGTYPE sig_int(UNUSED(int val))
583 /* KLUGE: if the user hits Ctrl-C while ssh is prompting
584 * for a password, then our cleanup's sending of a SIGUSR1
585 * signal to all our children may kill ssh before it has a
586 * chance to restore the tty settings (i.e. turn echo back
587 * on). By sleeping for a short time, ssh gets a bigger
588 * chance to do the right thing. If child processes are
589 * not ssh waiting for a password, then this tiny delay
590 * shouldn't hurt anything. */
592 exit_cleanup(RERR_SIGNAL);
595 /* Finish off a file transfer: renaming the file and setting the file's
596 * attributes (e.g. permissions, ownership, etc.). If the robust_rename()
597 * call is forced to copy the temp file and partialptr is both non-NULL and
598 * not an absolute path, we stage the file into the partial-dir and then
599 * rename it into place. This returns 1 on succcess or 0 on failure. */
600 int finish_transfer(const char *fname, const char *fnametmp,
601 const char *fnamecmp, const char *partialptr,
602 struct file_struct *file, int ok_to_set_time,
603 int overwriting_basis)
606 const char *temp_copy_name = partialptr && *partialptr != '/' ? partialptr : NULL;
609 if (DEBUG_GTE(RECV, 1))
610 rprintf(FINFO, "finishing %s\n", fname);
612 goto do_set_file_attrs;
615 if (make_backups > 0 && overwriting_basis) {
616 int ok = make_backup(fname, False);
619 if (ok == 1 && fnamecmp == fname)
620 fnamecmp = get_backup_name(fname);
623 /* Change permissions before putting the file into place. */
624 set_file_attrs(fnametmp, file, NULL, fnamecmp,
625 ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
627 /* move tmp file over real file */
628 if (DEBUG_GTE(RECV, 1))
629 rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
630 ret = robust_rename(fnametmp, fname, temp_copy_name,
631 file->mode & INITACCESSPERMS);
633 rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"",
634 ret == -2 ? "copy" : "rename",
635 full_fname(fnametmp), fname);
636 if (!partialptr || (ret == -2 && temp_copy_name)
637 || robust_rename(fnametmp, partialptr, NULL,
638 file->mode & INITACCESSPERMS) < 0)
643 /* The file was moved into place (not copied), so it's done. */
646 /* The file was copied, so tweak the perms of the copied file. If it
647 * was copied to partialptr, move it into its final destination. */
648 fnametmp = temp_copy_name ? temp_copy_name : fname;
651 set_file_attrs(fnametmp, file, NULL, fnamecmp,
652 ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
654 if (temp_copy_name) {
655 if (do_rename(fnametmp, fname) < 0) {
656 rsyserr(FERROR_XFER, errno, "rename %s -> \"%s\"",
657 full_fname(fnametmp), fname);
660 handle_partial_dir(temp_copy_name, PDIR_DELETE);
665 struct file_list *flist_for_ndx(int ndx, const char *fatal_error_loc)
667 struct file_list *flist = cur_flist;
669 if (!flist && !(flist = first_flist))
672 while (ndx < flist->ndx_start-1) {
673 if (flist == first_flist)
677 while (ndx >= flist->ndx_start + flist->used) {
678 if (!(flist = flist->next))
684 if (fatal_error_loc) {
687 first = first_flist->ndx_start - 1;
688 last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
694 "File-list index %d not in %d - %d (%s) [%s]\n",
695 ndx, first, last, fatal_error_loc, who_am_i());
696 exit_cleanup(RERR_PROTOCOL);
701 const char *who_am_i(void)
704 return am_server ? "server" : "client";
705 return am_sender ? "sender" : am_generator ? "generator" : "receiver";