468 lines
12 KiB
C
468 lines
12 KiB
C
/*
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* Routines common to more than one of the rsync processes.
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*
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* Copyright (C) 1996 Andrew Tridgell
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* Copyright (C) 1996 Paul Mackerras
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* Copyright (C) 2003-2007 Wayne Davison
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "rsync.h"
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#if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H
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#include <iconv.h>
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#endif
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#if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
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#include <libcharset.h>
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#elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
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#include <langinfo.h>
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#endif
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extern int verbose;
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extern int dry_run;
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extern int preserve_acls;
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extern int preserve_xattrs;
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extern int preserve_perms;
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extern int preserve_executability;
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extern int preserve_times;
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extern int omit_dir_times;
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extern int am_root;
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extern int am_server;
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extern int am_sender;
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extern int am_generator;
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extern int am_starting_up;
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extern int allow_8bit_chars;
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extern int protocol_version;
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extern int preserve_uid;
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extern int preserve_gid;
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extern int inc_recurse;
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extern int inplace;
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extern int flist_eof;
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extern int keep_dirlinks;
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extern int make_backups;
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extern struct file_list *cur_flist, *first_flist, *dir_flist;
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extern struct chmod_mode_struct *daemon_chmod_modes;
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#if defined HAVE_ICONV_OPEN && defined HAVE_ICONV_H
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iconv_t ic_chck = (iconv_t)-1;
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static const char *default_charset(void)
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{
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#if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
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return locale_charset();
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#elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
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return nl_langinfo(CODESET);
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#else
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return ""; /* Works with (at the very least) gnu iconv... */
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#endif
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}
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void setup_iconv()
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{
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if (!am_server && !allow_8bit_chars) {
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const char *defset = default_charset();
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/* It's OK if this fails... */
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ic_chck = iconv_open(defset, defset);
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if (verbose > 3) {
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if (ic_chck == (iconv_t)-1) {
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rprintf(FINFO,
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"note: iconv_open(\"%s\", \"%s\") failed (%d)"
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" -- using isprint() instead of iconv().\n",
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defset, defset, errno);
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} else {
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rprintf(FINFO,
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"note: iconv_open(\"%s\", \"%s\") succeeded.\n",
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defset, defset);
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}
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}
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}
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}
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#endif
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int read_ndx_and_attrs(int f_in, int *iflag_ptr, uchar *type_ptr,
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char *buf, int *len_ptr)
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{
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int len, iflags = 0;
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struct file_list *flist;
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uchar fnamecmp_type = FNAMECMP_FNAME;
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int verbose_save, ndx;
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read_loop:
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while (1) {
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ndx = read_ndx(f_in);
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if (ndx >= 0)
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break;
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if (ndx == NDX_DONE)
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return ndx;
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if (!inc_recurse || am_sender)
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goto invalid_ndx;
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if (ndx == NDX_FLIST_EOF) {
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flist_eof = 1;
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send_msg(MSG_FLIST_EOF, "", 0);
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continue;
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}
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ndx = NDX_FLIST_OFFSET - ndx;
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if (ndx < 0 || ndx >= dir_flist->count) {
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ndx = NDX_FLIST_OFFSET - ndx;
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rprintf(FERROR,
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"Invalid dir index: %d (%d - %d)\n",
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ndx, NDX_FLIST_OFFSET,
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NDX_FLIST_OFFSET - dir_flist->count);
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exit_cleanup(RERR_PROTOCOL);
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}
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verbose_save = verbose;
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verbose = 0; /* TODO allow verbose messages? */
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/* Send everything read from f_in to msg_fd_out. */
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send_msg_int(MSG_FLIST, ndx);
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start_flist_forward(f_in);
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flist = recv_file_list(f_in);
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flist->parent_ndx = ndx;
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stop_flist_forward();
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verbose = verbose_save;
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}
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iflags = protocol_version >= 29 ? read_shortint(f_in)
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: ITEM_TRANSFER | ITEM_MISSING_DATA;
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/* Honor the old-style keep-alive indicator. */
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if (protocol_version < 30
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&& ndx == cur_flist->count && iflags == ITEM_IS_NEW) {
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if (am_sender)
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maybe_send_keepalive();
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goto read_loop;
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}
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if (!(flist = flist_for_ndx(ndx))) {
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invalid_ndx:
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rprintf(FERROR,
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"Invalid file index: %d (%d - %d) with iflags %x [%s]\n",
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ndx, first_flist->ndx_start + first_flist->ndx_start,
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first_flist->prev->ndx_start + first_flist->ndx_start
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+ first_flist->prev->count - 1, iflags, who_am_i());
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exit_cleanup(RERR_PROTOCOL);
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}
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cur_flist = flist;
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if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
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fnamecmp_type = read_byte(f_in);
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*type_ptr = fnamecmp_type;
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if (iflags & ITEM_XNAME_FOLLOWS) {
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if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
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exit_cleanup(RERR_PROTOCOL);
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} else {
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*buf = '\0';
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len = -1;
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}
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*len_ptr = len;
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if (iflags & ITEM_TRANSFER) {
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int i = ndx - cur_flist->ndx_start;
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if (!S_ISREG(cur_flist->files[i]->mode)) {
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rprintf(FERROR,
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"received request to transfer non-regular file: %d [%s]\n",
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ndx, who_am_i());
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exit_cleanup(RERR_PROTOCOL);
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}
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}
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*iflag_ptr = iflags;
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return ndx;
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}
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/*
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free a sums struct
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*/
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void free_sums(struct sum_struct *s)
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{
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if (s->sums) free(s->sums);
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free(s);
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}
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/* This is only called when we aren't preserving permissions. Figure out what
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* the permissions should be and return them merged back into the mode. */
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mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
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int exists)
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{
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int new_mode;
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/* If the file already exists, we'll return the local permissions,
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* possibly tweaked by the --executability option. */
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if (exists) {
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new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
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if (preserve_executability && S_ISREG(flist_mode)) {
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/* If the source file is executable, grant execute
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* rights to everyone who can read, but ONLY if the
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* file isn't already executable. */
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if (!(flist_mode & 0111))
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new_mode &= ~0111;
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else if (!(stat_mode & 0111))
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new_mode |= (new_mode & 0444) >> 2;
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}
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} else {
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/* Apply destination default permissions and turn
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* off special permissions. */
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new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
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}
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return new_mode;
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}
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int set_file_attrs(const char *fname, struct file_struct *file, statx *sxp,
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const char *fnamecmp, int flags)
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{
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int updated = 0;
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statx sx2;
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int change_uid, change_gid;
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mode_t new_mode = file->mode;
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if (!sxp) {
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if (dry_run)
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return 1;
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if (link_stat(fname, &sx2.st, 0) < 0) {
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rsyserr(FERROR, errno, "stat %s failed",
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full_fname(fname));
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return 0;
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}
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#ifdef SUPPORT_ACLS
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sx2.acc_acl = sx2.def_acl = NULL;
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#endif
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#ifdef SUPPORT_XATTRS
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sx2.xattr = NULL;
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#endif
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if (!preserve_perms && S_ISDIR(new_mode)
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&& sx2.st.st_mode & S_ISGID) {
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/* We just created this directory and its setgid
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* bit is on, so make sure it stays on. */
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new_mode |= S_ISGID;
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}
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sxp = &sx2;
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}
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#ifdef SUPPORT_ACLS
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if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
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get_acl(fname, sxp);
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#endif
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#ifdef SUPPORT_XATTRS
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if (preserve_xattrs && fnamecmp)
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set_xattr(fname, file, fnamecmp, sxp);
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#endif
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if (!preserve_times || (S_ISDIR(sxp->st.st_mode) && omit_dir_times))
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flags |= ATTRS_SKIP_MTIME;
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if (!(flags & ATTRS_SKIP_MTIME)
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&& cmp_time(sxp->st.st_mtime, file->modtime) != 0) {
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int ret = set_modtime(fname, file->modtime, sxp->st.st_mode);
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if (ret < 0) {
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rsyserr(FERROR, errno, "failed to set times on %s",
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full_fname(fname));
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goto cleanup;
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}
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if (ret == 0) /* ret == 1 if symlink could not be set */
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updated = 1;
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}
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change_uid = am_root && preserve_uid && sxp->st.st_uid != F_UID(file);
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change_gid = preserve_gid && F_GID(file) != GID_NONE
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&& sxp->st.st_gid != F_GID(file);
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#if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK
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if (S_ISLNK(sxp->st.st_mode))
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;
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else
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#endif
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if (change_uid || change_gid) {
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if (verbose > 2) {
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if (change_uid) {
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rprintf(FINFO,
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"set uid of %s from %ld to %ld\n",
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fname,
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(long)sxp->st.st_uid, (long)F_UID(file));
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}
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if (change_gid) {
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rprintf(FINFO,
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"set gid of %s from %ld to %ld\n",
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fname,
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(long)sxp->st.st_gid, (long)F_GID(file));
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}
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}
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if (do_lchown(fname,
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change_uid ? F_UID(file) : sxp->st.st_uid,
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change_gid ? F_GID(file) : sxp->st.st_gid) != 0) {
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/* shouldn't have attempted to change uid or gid
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* unless have the privilege */
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rsyserr(FERROR, errno, "%s %s failed",
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change_uid ? "chown" : "chgrp",
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full_fname(fname));
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goto cleanup;
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}
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/* a lchown had been done - we have to re-stat if the
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* destination had the setuid or setgid bits set due
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* to the side effect of the chown call */
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if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
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link_stat(fname, &sxp->st,
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keep_dirlinks && S_ISDIR(sxp->st.st_mode));
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}
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updated = 1;
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}
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if (daemon_chmod_modes && !S_ISLNK(new_mode))
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new_mode = tweak_mode(new_mode, daemon_chmod_modes);
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#ifdef SUPPORT_ACLS
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/* It's OK to call set_acl() now, even for a dir, as the generator
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* will enable owner-writability using chmod, if necessary.
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*
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* If set_acl() changes permission bits in the process of setting
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* an access ACL, it changes sxp->st.st_mode so we know whether we
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* need to chmod(). */
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if (preserve_acls && !S_ISLNK(new_mode) && set_acl(fname, file, sxp) == 0)
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updated = 1;
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#endif
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#ifdef HAVE_CHMOD
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if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
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int ret = do_chmod(fname, new_mode);
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if (ret < 0) {
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rsyserr(FERROR, errno,
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"failed to set permissions on %s",
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full_fname(fname));
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goto cleanup;
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}
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if (ret == 0) /* ret == 1 if symlink could not be set */
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updated = 1;
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}
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#endif
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if (verbose > 1 && flags & ATTRS_REPORT) {
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if (updated)
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rprintf(FCLIENT, "%s\n", fname);
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else
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rprintf(FCLIENT, "%s is uptodate\n", fname);
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}
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cleanup:
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if (sxp == &sx2) {
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#ifdef SUPPORT_ACLS
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if (preserve_acls)
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free_acl(&sx2);
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#endif
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#ifdef SUPPORT_XATTRS
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if (preserve_xattrs)
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free_xattr(&sx2);
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#endif
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}
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return updated;
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}
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RETSIGTYPE sig_int(UNUSED(int val))
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{
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/* KLUGE: if the user hits Ctrl-C while ssh is prompting
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* for a password, then our cleanup's sending of a SIGUSR1
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* signal to all our children may kill ssh before it has a
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* chance to restore the tty settings (i.e. turn echo back
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* on). By sleeping for a short time, ssh gets a bigger
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* chance to do the right thing. If child processes are
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* not ssh waiting for a password, then this tiny delay
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* shouldn't hurt anything. */
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msleep(400);
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exit_cleanup(RERR_SIGNAL);
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}
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/* Finish off a file transfer: renaming the file and setting the file's
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* attributes (e.g. permissions, ownership, etc.). If partialptr is not
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* NULL and the robust_rename() call is forced to copy the temp file, we
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* stage the file into the partial-dir and then rename it into place. */
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void finish_transfer(const char *fname, const char *fnametmp,
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const char *fnamecmp, const char *partialptr,
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struct file_struct *file, int ok_to_set_time,
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int overwriting_basis)
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{
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int ret;
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if (inplace) {
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if (verbose > 2)
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rprintf(FINFO, "finishing %s\n", fname);
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fnametmp = fname;
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goto do_set_file_attrs;
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}
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if (make_backups > 0 && overwriting_basis && !make_backup(fname))
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return;
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/* Change permissions before putting the file into place. */
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set_file_attrs(fnametmp, file, NULL, fnamecmp,
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ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
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/* move tmp file over real file */
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if (verbose > 2)
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rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
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ret = robust_rename(fnametmp, fname, partialptr,
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file->mode & INITACCESSPERMS);
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if (ret < 0) {
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rsyserr(FERROR, errno, "%s %s -> \"%s\"",
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ret == -2 ? "copy" : "rename",
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full_fname(fnametmp), fname);
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do_unlink(fnametmp);
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return;
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}
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if (ret == 0) {
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/* The file was moved into place (not copied), so it's done. */
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return;
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}
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/* The file was copied, so tweak the perms of the copied file. If it
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* was copied to partialptr, move it into its final destination. */
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fnametmp = partialptr ? partialptr : fname;
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do_set_file_attrs:
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set_file_attrs(fnametmp, file, NULL, fnamecmp,
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ok_to_set_time ? 0 : ATTRS_SKIP_MTIME);
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if (partialptr) {
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if (do_rename(fnametmp, fname) < 0) {
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rsyserr(FERROR, errno, "rename %s -> \"%s\"",
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full_fname(fnametmp), fname);
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} else
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handle_partial_dir(partialptr, PDIR_DELETE);
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}
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}
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struct file_list *flist_for_ndx(int ndx)
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{
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struct file_list *flist = cur_flist;
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if (!flist && !(flist = first_flist))
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return NULL;
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while (ndx < flist->ndx_start) {
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if (flist == first_flist)
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return NULL;
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flist = flist->prev;
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}
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while (ndx >= flist->ndx_start + flist->count) {
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if (!(flist = flist->next))
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return NULL;
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}
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return flist;
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}
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const char *who_am_i(void)
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{
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if (am_starting_up)
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return am_server ? "server" : "client";
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return am_sender ? "sender" : am_generator ? "generator" : "receiver";
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}
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