308 lines
8.7 KiB
C
308 lines
8.7 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, 2004, 2005, 2006 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 as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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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 daemon_log_format_has_i;
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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 preserve_uid;
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extern int preserve_gid;
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extern int inplace;
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extern int keep_dirlinks;
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extern int make_backups;
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extern mode_t orig_umask;
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extern struct stats stats;
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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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/*
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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 cur_mode, int exists)
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{
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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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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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cur_mode &= ~0111;
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else if (!(cur_mode & 0111))
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cur_mode |= (cur_mode & 0444) >> 2;
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}
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} else
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cur_mode = flist_mode & ACCESSPERMS & ~orig_umask;
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if (daemon_chmod_modes && !S_ISLNK(flist_mode))
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cur_mode = tweak_mode(cur_mode, daemon_chmod_modes);
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return (flist_mode & ~CHMOD_BITS) | (cur_mode & CHMOD_BITS);
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}
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int set_file_attrs(char *fname, struct file_struct *file, STRUCT_STAT *st,
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int flags)
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{
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int updated = 0;
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STRUCT_STAT st2;
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int change_uid, change_gid;
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if (!st) {
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if (dry_run)
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return 1;
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if (link_stat(fname, &st2, 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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st = &st2;
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if (!preserve_perms && S_ISDIR(file->mode)
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&& 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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file->mode |= S_ISGID;
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}
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}
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if (!preserve_times || (S_ISDIR(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(st->st_mtime, file->modtime) != 0) {
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int ret = set_modtime(fname, file->modtime, 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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return 0;
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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 && st->st_uid != file->uid;
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change_gid = preserve_gid && file->gid != GID_NONE
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&& st->st_gid != file->gid;
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#if !defined HAVE_LCHOWN && !defined CHOWN_MODIFIES_SYMLINK
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if (S_ISLNK(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)st->st_uid, (long)file->uid);
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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)st->st_gid, (long)file->gid);
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}
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}
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if (do_lchown(fname,
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change_uid ? file->uid : st->st_uid,
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change_gid ? file->gid : 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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return 0;
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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 (st->st_mode & (S_ISUID | S_ISGID)) {
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link_stat(fname, st,
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keep_dirlinks && S_ISDIR(st->st_mode));
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}
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updated = 1;
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}
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#ifdef HAVE_CHMOD
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if ((st->st_mode & CHMOD_BITS) != (file->mode & CHMOD_BITS)) {
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int ret = do_chmod(fname, file->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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return 0;
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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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enum logcode code = daemon_log_format_has_i || dry_run
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? FCLIENT : FINFO;
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if (updated)
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rprintf(code, "%s\n", fname);
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else
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rprintf(code, "%s is uptodate\n", fname);
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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(char *fname, char *fnametmp, 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 && 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,
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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,
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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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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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