More tweaks for Actions.

[thirdparty/rsync.git] / rsync.c

/*
 * Routines common to more than one of the rsync processes.
 *
 * Copyright (C) 1996 Andrew Tridgell
 * Copyright (C) 1996 Paul Mackerras
 * Copyright (C) 2003-2022 Wayne Davison
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, visit the http://fsf.org website.
 */

#include "rsync.h"
#include "ifuncs.h"
#if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
#include <libcharset.h>
#elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
#include <langinfo.h>
#endif

extern int dry_run;
extern int preserve_acls;
extern int preserve_xattrs;
extern int preserve_perms;
extern int preserve_executability;
extern int preserve_mtimes;
extern int omit_dir_times;
extern int omit_link_times;
extern int am_root;
extern int am_server;
extern int am_daemon;
extern int am_sender;
extern int am_receiver;
extern int am_generator;
extern int am_starting_up;
extern int allow_8bit_chars;
extern int protocol_version;
extern int got_kill_signal;
extern int called_from_signal_handler;
extern int inc_recurse;
extern int inplace;
extern int flist_eof;
extern int file_old_total;
extern int keep_dirlinks;
extern int make_backups;
extern int sanitize_paths;
extern struct file_list *cur_flist, *first_flist, *dir_flist;
extern struct chmod_mode_struct *daemon_chmod_modes;
#ifdef ICONV_OPTION
extern char *iconv_opt;
#endif

#define UPDATED_OWNER (1<<0)
#define UPDATED_GROUP (1<<1)
#define UPDATED_MTIME (1<<2)
#define UPDATED_ATIME (1<<3)
#define UPDATED_ACLS  (1<<4)
#define UPDATED_MODE  (1<<5)
#define UPDATED_CRTIME (1<<6)

#ifdef ICONV_CONST
iconv_t ic_chck = (iconv_t)-1;
# ifdef ICONV_OPTION
iconv_t ic_send = (iconv_t)-1, ic_recv = (iconv_t)-1;
# endif

static const char *default_charset(void)
{
# if defined HAVE_LIBCHARSET_H && defined HAVE_LOCALE_CHARSET
        return locale_charset();
# elif defined HAVE_LANGINFO_H && defined HAVE_NL_LANGINFO
        return nl_langinfo(CODESET);
# else
        return ""; /* Works with (at the very least) gnu iconv... */
# endif
}

void setup_iconv(void)
{
        const char *defset = default_charset();
# ifdef ICONV_OPTION
        const char *charset;
        char *cp;
# endif

        if (!am_server && !allow_8bit_chars) {
                /* It's OK if this fails... */
                ic_chck = iconv_open(defset, defset);

                if (DEBUG_GTE(ICONV, 2)) {
                        if (ic_chck == (iconv_t)-1) {
                                rprintf(FINFO,
                                        "msg checking via isprint()"
                                        " (iconv_open(\"%s\", \"%s\") errno: %d)\n",
                                        defset, defset, errno);
                        } else {
                                rprintf(FINFO,
                                        "msg checking charset: %s\n",
                                        defset);
                        }
                }
        } else
                ic_chck = (iconv_t)-1;

# ifdef ICONV_OPTION
        if (!iconv_opt)
                return;

        if ((cp = strchr(iconv_opt, ',')) != NULL) {
                if (am_server) /* A local transfer needs this. */
                        iconv_opt = cp + 1;
                else
                        *cp = '\0';
        }

        if (!*iconv_opt || (*iconv_opt == '.' && iconv_opt[1] == '\0'))
                charset = defset;
        else
                charset = iconv_opt;

        if ((ic_send = iconv_open(UTF8_CHARSET, charset)) == (iconv_t)-1) {
                rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
                        UTF8_CHARSET, charset);
                exit_cleanup(RERR_UNSUPPORTED);
        }

        if ((ic_recv = iconv_open(charset, UTF8_CHARSET)) == (iconv_t)-1) {
                rprintf(FERROR, "iconv_open(\"%s\", \"%s\") failed\n",
                        charset, UTF8_CHARSET);
                exit_cleanup(RERR_UNSUPPORTED);
        }

        if (DEBUG_GTE(ICONV, 1)) {
                rprintf(FINFO, "[%s] charset: %s\n",
                        who_am_i(), *charset ? charset : "[LOCALE]");
        }
# endif
}

/* This function converts the chars in the "in" xbuf into characters in the
 * "out" xbuf.  The ".len" chars of the "in" xbuf is used starting from its
 * ".pos".  The ".size" of the "out" xbuf restricts how many characters can
 * be stored, starting at its ".pos+.len" position.  Note that the last byte
 * of the "out" xbuf is not used, which reserves space for a trailing '\0'
 * (though it is up to the caller to store a trailing '\0', as needed).
 *
 * We return a 0 on success or a -1 on error.  An error also sets errno to
 * E2BIG, EILSEQ, or EINVAL (see below); otherwise errno will be set to 0.
 * The "in" xbuf is altered to update ".pos" and ".len".  The "out" xbuf has
 * data appended, and its ".len" incremented (see below for a ".size" note).
 *
 * If ICB_CIRCULAR_OUT is set in "flags", the chars going into the "out" xbuf
 * can wrap around to the start, and the xbuf may have its ".size" reduced
 * (presumably by 1 byte) if the iconv code doesn't have space to store a
 * multi-byte character at the physical end of the ".buf" (though no reducing
 * happens if ".pos" is <= 1, since there is no room to wrap around).
 *
 * If ICB_EXPAND_OUT is set in "flags", the "out" xbuf will be allocated if
 * empty, and (as long as ICB_CIRCULAR_OUT is not set) expanded if too small.
 * This prevents the return of E2BIG (except for a circular xbuf).
 *
 * If ICB_INCLUDE_BAD is set in "flags", any badly-encoded chars are included
 * verbatim in the "out" xbuf, so EILSEQ will not be returned.
 *
 * If ICB_INCLUDE_INCOMPLETE is set in "flags", any incomplete multi-byte
 * chars are included, which ensures that EINVAL is not returned.
 *
 * If ICB_INIT is set, the iconv() conversion state is initialized prior to
 * processing the characters. */
int iconvbufs(iconv_t ic, xbuf *in, xbuf *out, int flags)
{
        ICONV_CONST char *ibuf;
        size_t icnt, ocnt, opos;
        char *obuf;

        if (!out->size && flags & ICB_EXPAND_OUT) {
                size_t siz = ROUND_UP_1024(in->len * 2);
                alloc_xbuf(out, siz);
        } else if (out->len+1 >= out->size) {
                /* There is no room to even start storing data. */
                if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
                        errno = E2BIG;
                        return -1;
                }
                realloc_xbuf(out, out->size + ROUND_UP_1024(in->len * 2));
        }

        if (flags & ICB_INIT)
                iconv(ic, NULL, 0, NULL, 0);

        ibuf = in->buf + in->pos;
        icnt = in->len;

        opos = out->pos + out->len;
        if (flags & ICB_CIRCULAR_OUT) {
                if (opos >= out->size) {
                        opos -= out->size;
                        /* We know that out->pos is not 0 due to the "no room" check
                         * above, so this can't go "negative". */
                        ocnt = out->pos - opos - 1;
                } else {
                        /* Allow the use of all bytes to the physical end of the buffer
                         * unless pos is 0, in which case we reserve our trailing '\0'. */
                        ocnt = out->size - opos - (out->pos ? 0 : 1);
                }
        } else
                ocnt = out->size - opos - 1;
        obuf = out->buf + opos;

        while (icnt) {
                while (iconv(ic, &ibuf, &icnt, &obuf, &ocnt) == (size_t)-1) {
                        if (errno == EINTR)
                                continue;
                        if (errno == EINVAL) {
                                if (!(flags & ICB_INCLUDE_INCOMPLETE))
                                        goto finish;
                                if (!ocnt)
                                        goto e2big;
                        } else if (errno == EILSEQ) {
                                if (!(flags & ICB_INCLUDE_BAD))
                                        goto finish;
                                if (!ocnt)
                                        goto e2big;
                        } else if (errno == E2BIG) {
                                size_t siz;
                          e2big:
                                opos = obuf - out->buf;
                                if (flags & ICB_CIRCULAR_OUT && out->pos > 1 && opos > out->pos) {
                                        /* We are in a divided circular buffer at the physical
                                         * end with room to wrap to the start.  If iconv() refused
                                         * to use one or more trailing bytes in the buffer, we
                                         * set the size to ignore the unused bytes. */
                                        if (opos < out->size)
                                                reduce_iobuf_size(out, opos);
                                        obuf = out->buf;
                                        ocnt = out->pos - 1;
                                        continue;
                                }
                                if (!(flags & ICB_EXPAND_OUT) || flags & ICB_CIRCULAR_OUT) {
                                        errno = E2BIG;
                                        goto finish;
                                }
                                siz = ROUND_UP_1024(in->len * 2);
                                realloc_xbuf(out, out->size + siz);
                                obuf = out->buf + opos;
                                ocnt += siz;
                                continue;
                        } else {
                                rsyserr(FERROR, errno, "unexpected error from iconv()");
                                exit_cleanup(RERR_UNSUPPORTED);
                        }
                        *obuf++ = *ibuf++;
                        ocnt--, icnt--;
                        if (!icnt)
                                break;
                }
        }

        errno = 0;

  finish:
        opos = obuf - out->buf;
        if (flags & ICB_CIRCULAR_OUT && opos < out->pos)
                opos += out->size;
        out->len = opos - out->pos;

        in->len = icnt;
        in->pos = ibuf - in->buf;

        return errno ? -1 : 0;
}
#endif

void send_protected_args(int fd, char *args[])
{
        int i;
#ifdef ICONV_OPTION
        int convert = ic_send != (iconv_t)-1;
        xbuf outbuf, inbuf;

        if (convert)
                alloc_xbuf(&outbuf, 1024);
#endif

        for (i = 0; args[i]; i++) {} /* find first NULL */
        args[i] = "rsync"; /* set a new arg0 */
        if (DEBUG_GTE(CMD, 1))
                print_child_argv("protected args:", args + i + 1);
        do {
                if (!args[i][0])
                        write_buf(fd, ".", 2);
#ifdef ICONV_OPTION
                else if (convert) {
                        INIT_XBUF_STRLEN(inbuf, args[i]);
                        iconvbufs(ic_send, &inbuf, &outbuf,
                                  ICB_EXPAND_OUT | ICB_INCLUDE_BAD | ICB_INCLUDE_INCOMPLETE | ICB_INIT);
                        outbuf.buf[outbuf.len] = '\0';
                        write_buf(fd, outbuf.buf, outbuf.len + 1);
                        outbuf.len = 0;
                }
#endif
                else
                        write_buf(fd, args[i], strlen(args[i]) + 1);
        } while (args[++i]);
        write_byte(fd, 0);

#ifdef ICONV_OPTION
        if (convert)
                free(outbuf.buf);
#endif
}

int read_ndx_and_attrs(int f_in, int f_out, int *iflag_ptr, uchar *type_ptr, char *buf, int *len_ptr)
{
        int len, iflags = 0;
        struct file_list *flist;
        uchar fnamecmp_type = FNAMECMP_FNAME;
        int ndx;

  read_loop:
        while (1) {
                ndx = read_ndx(f_in);

                if (ndx >= 0)
                        break;
                if (ndx == NDX_DONE)
                        return ndx;
                if (ndx == NDX_DEL_STATS) {
                        read_del_stats(f_in);
                        if (am_sender && am_server)
                                write_del_stats(f_out);
                        continue;
                }
                if (!inc_recurse || am_sender) {
                        int last;
                        if (first_flist)
                                last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
                        else
                                last = -1;
                        rprintf(FERROR,
                                "Invalid file index: %d (%d - %d) [%s]\n",
                                ndx, NDX_DONE, last, who_am_i());
                        exit_cleanup(RERR_PROTOCOL);
                }
                if (ndx == NDX_FLIST_EOF) {
                        flist_eof = 1;
                        if (DEBUG_GTE(FLIST, 3))
                                rprintf(FINFO, "[%s] flist_eof=1\n", who_am_i());
                        write_int(f_out, NDX_FLIST_EOF);
                        continue;
                }
                ndx = NDX_FLIST_OFFSET - ndx;
                if (ndx < 0 || ndx >= dir_flist->used) {
                        ndx = NDX_FLIST_OFFSET - ndx;
                        rprintf(FERROR,
                                "Invalid dir index: %d (%d - %d) [%s]\n",
                                ndx, NDX_FLIST_OFFSET,
                                NDX_FLIST_OFFSET - dir_flist->used + 1,
                                who_am_i());
                        exit_cleanup(RERR_PROTOCOL);
                }

                if (DEBUG_GTE(FLIST, 2)) {
                        rprintf(FINFO, "[%s] receiving flist for dir %d\n",
                                who_am_i(), ndx);
                }
                /* Send all the data we read for this flist to the generator. */
                start_flist_forward(ndx);
                flist = recv_file_list(f_in, ndx);
                flist->parent_ndx = ndx;
                stop_flist_forward();
        }

        iflags = protocol_version >= 29 ? read_shortint(f_in)
                   : ITEM_TRANSFER | ITEM_MISSING_DATA;

        /* Support the protocol-29 keep-alive style. */
        if (protocol_version < 30 && ndx == cur_flist->used && iflags == ITEM_IS_NEW) {
                if (am_sender)
                        maybe_send_keepalive(time(NULL), MSK_ALLOW_FLUSH);
                goto read_loop;
        }

        flist = flist_for_ndx(ndx, "read_ndx_and_attrs");
        if (flist != cur_flist) {
                cur_flist = flist;
                if (am_sender) {
                        file_old_total = cur_flist->used;
                        for (flist = first_flist; flist != cur_flist; flist = flist->next)
                                file_old_total += flist->used;
                }
        }

        if (iflags & ITEM_BASIS_TYPE_FOLLOWS)
                fnamecmp_type = read_byte(f_in);
        *type_ptr = fnamecmp_type;

        if (iflags & ITEM_XNAME_FOLLOWS) {
                if ((len = read_vstring(f_in, buf, MAXPATHLEN)) < 0)
                        exit_cleanup(RERR_PROTOCOL);

                if (sanitize_paths) {
                        sanitize_path(buf, buf, "", 0, SP_DEFAULT);
                        len = strlen(buf);
                }
        } else {
                *buf = '\0';
                len = -1;
        }
        *len_ptr = len;

        if (iflags & ITEM_TRANSFER) {
                int i = ndx - cur_flist->ndx_start;
                if (i < 0 || !S_ISREG(cur_flist->files[i]->mode)) {
                        rprintf(FERROR,
                                "received request to transfer non-regular file: %d [%s]\n",
                                ndx, who_am_i());
                        exit_cleanup(RERR_PROTOCOL);
                }
        }

        *iflag_ptr = iflags;
        return ndx;
}

/*
  free a sums struct
  */
void free_sums(struct sum_struct *s)
{
        if (s->sums) free(s->sums);
        free(s);
}

/* This is only called when we aren't preserving permissions.  Figure out what
 * the permissions should be and return them merged back into the mode. */
mode_t dest_mode(mode_t flist_mode, mode_t stat_mode, int dflt_perms,
                 int exists)
{
        int new_mode;
        /* If the file already exists, we'll return the local permissions,
         * possibly tweaked by the --executability option. */
        if (exists) {
                new_mode = (flist_mode & ~CHMOD_BITS) | (stat_mode & CHMOD_BITS);
                if (preserve_executability && S_ISREG(flist_mode)) {
                        /* If the source file is executable, grant execute
                         * rights to everyone who can read, but ONLY if the
                         * file isn't already executable. */
                        if (!(flist_mode & 0111))
                                new_mode &= ~0111;
                        else if (!(stat_mode & 0111))
                                new_mode |= (new_mode & 0444) >> 2;
                }
        } else {
                /* Apply destination default permissions and turn
                 * off special permissions. */
                new_mode = flist_mode & (~CHMOD_BITS | dflt_perms);
        }
        return new_mode;
}

static int same_mtime(struct file_struct *file, STRUCT_STAT *st, int extra_accuracy)
{
#ifdef ST_MTIME_NSEC
        uint32 f1_nsec = F_MOD_NSEC_or_0(file);
        uint32 f2_nsec = (uint32)st->ST_MTIME_NSEC;
#else
        uint32 f1_nsec = 0, f2_nsec = 0;
#endif

        if (extra_accuracy) /* ignore modify_window when setting the time after a transfer or checksum check */
                return file->modtime == st->st_mtime && f1_nsec == f2_nsec;

        return same_time(file->modtime, f1_nsec, st->st_mtime , f2_nsec);
}

int set_file_attrs(const char *fname, struct file_struct *file, stat_x *sxp,
                   const char *fnamecmp, int flags)
{
        int updated = 0;
        stat_x sx2;
        int change_uid, change_gid;
        mode_t new_mode = file->mode;
        int inherit;

        if (!sxp) {
                if (dry_run)
                        return 1;
                if (link_stat(fname, &sx2.st, 0) < 0) {
                        rsyserr(FERROR_XFER, errno, "stat %s failed",
                                full_fname(fname));
                        return 0;
                }
                init_stat_x(&sx2);
                sxp = &sx2;
                inherit = !preserve_perms;
        } else
                inherit = !preserve_perms && file->flags & FLAG_DIR_CREATED;

        if (inherit && S_ISDIR(new_mode) && sxp->st.st_mode & S_ISGID) {
                /* We just created this directory and its setgid
                 * bit is on, so make sure it stays on. */
                new_mode |= S_ISGID;
        }

        if (daemon_chmod_modes && !S_ISLNK(new_mode))
                new_mode = tweak_mode(new_mode, daemon_chmod_modes);

#ifdef SUPPORT_ACLS
        if (preserve_acls && !S_ISLNK(file->mode) && !ACL_READY(*sxp))
                get_acl(fname, sxp);
#endif

        change_uid = am_root && uid_ndx && sxp->st.st_uid != (uid_t)F_OWNER(file);
        change_gid = gid_ndx && !(file->flags & FLAG_SKIP_GROUP)
                  && sxp->st.st_gid != (gid_t)F_GROUP(file);
#ifndef CAN_CHOWN_SYMLINK
        if (S_ISLNK(sxp->st.st_mode)) {
                ;
        } else
#endif
        if (change_uid || change_gid) {
                if (DEBUG_GTE(OWN, 1)) {
                        if (change_uid) {
                                rprintf(FINFO,
                                        "set uid of %s from %u to %u\n",
                                        fname, (unsigned)sxp->st.st_uid, F_OWNER(file));
                        }
                        if (change_gid) {
                                rprintf(FINFO,
                                        "set gid of %s from %u to %u\n",
                                        fname, (unsigned)sxp->st.st_gid, F_GROUP(file));
                        }
                }
                if (am_root >= 0) {
                        uid_t uid = change_uid ? (uid_t)F_OWNER(file) : sxp->st.st_uid;
                        gid_t gid = change_gid ? (gid_t)F_GROUP(file) : sxp->st.st_gid;
                        if (do_lchown(fname, uid, gid) != 0) {
                                /* We shouldn't have attempted to change uid
                                 * or gid unless have the privilege. */
                                rsyserr(FERROR_XFER, errno, "%s %s failed",
                                        change_uid ? "chown" : "chgrp",
                                        full_fname(fname));
                                goto cleanup;
                        }
                        if (uid == (uid_t)-1 && sxp->st.st_uid != (uid_t)-1)
                                rprintf(FERROR_XFER, "uid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
                        if (gid == (gid_t)-1 && sxp->st.st_gid != (gid_t)-1)
                                rprintf(FERROR_XFER, "gid 4294967295 (-1) is impossible to set on %s\n", full_fname(fname));
                        /* A lchown had been done, so we need to re-stat if
                         * the destination had the setuid or setgid bits set
                         * (due to the side effect of the chown call). */
                        if (sxp->st.st_mode & (S_ISUID | S_ISGID)) {
                                link_stat(fname, &sxp->st,
                                          keep_dirlinks && S_ISDIR(sxp->st.st_mode));
                        }
                }
                if (change_uid)
                        updated |= UPDATED_OWNER;
                if (change_gid)
                        updated |= UPDATED_GROUP;
        }

#ifdef SUPPORT_XATTRS
        if (am_root < 0)
                set_stat_xattr(fname, file, new_mode);
        if (preserve_xattrs && fnamecmp)
                set_xattr(fname, file, fnamecmp, sxp);
#endif

        if ((omit_dir_times && S_ISDIR(sxp->st.st_mode))
         || (omit_link_times && S_ISLNK(sxp->st.st_mode)))
                flags |= ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME | ATTRS_SKIP_CRTIME;
        else {
                if (!preserve_mtimes)
                        flags |= ATTRS_SKIP_MTIME;
                if (!atimes_ndx || S_ISDIR(sxp->st.st_mode))
                        flags |= ATTRS_SKIP_ATIME;
                /* Don't set the creation date on the root folder of an HFS+ volume. */
                if (sxp->st.st_ino == 2 && S_ISDIR(sxp->st.st_mode))
                        flags |= ATTRS_SKIP_CRTIME;
        }
        if (sxp != &sx2)
                memcpy(&sx2.st, &sxp->st, sizeof sx2.st);
        if (!(flags & ATTRS_SKIP_MTIME) && !same_mtime(file, &sxp->st, flags & ATTRS_ACCURATE_TIME)) {
                sx2.st.st_mtime = file->modtime;
#ifdef ST_MTIME_NSEC
                sx2.st.ST_MTIME_NSEC = F_MOD_NSEC_or_0(file);
#endif
                updated |= UPDATED_MTIME;
        }
        if (!(flags & ATTRS_SKIP_ATIME)) {
                time_t file_atime = F_ATIME(file);
                if (flags & ATTRS_ACCURATE_TIME || !same_time(sxp->st.st_atime, 0, file_atime, 0)) {
                        sx2.st.st_atime = file_atime;
#ifdef ST_ATIME_NSEC
                        sx2.st.ST_ATIME_NSEC = 0;
#endif
                        updated |= UPDATED_ATIME;
                }
        }
#ifdef SUPPORT_CRTIMES
        if (crtimes_ndx && !(flags & ATTRS_SKIP_CRTIME)) {
                time_t file_crtime = F_CRTIME(file);
                if (sxp->crtime == 0)
                        sxp->crtime = get_create_time(fname, &sxp->st);
                if (!same_time(sxp->crtime, 0L, file_crtime, 0L)) {
                        if (
#ifdef HAVE_GETATTRLIST
                             do_setattrlist_crtime(fname, file_crtime) == 0
#elif defined __CYGWIN__
                             do_SetFileTime(fname, file_crtime) == 0
#else
#error Unknown crtimes implementation
#endif
                        )
                                updated |= UPDATED_CRTIME;
                }
        }
#endif
        if (updated & (UPDATED_MTIME|UPDATED_ATIME)) {
                int ret = set_times(fname, &sx2.st);
                if (ret < 0) {
                        rsyserr(FERROR_XFER, errno, "failed to set times on %s", full_fname(fname));
                        goto cleanup;
                }
                if (ret > 0) { /* ret == 1 if symlink could not be set */
                        updated &= ~(UPDATED_MTIME|UPDATED_ATIME);
                        file->flags |= FLAG_TIME_FAILED;
                }
        }

#ifdef SUPPORT_ACLS
        /* It's OK to call set_acl() now, even for a dir, as the generator
         * will enable owner-writability using chmod, if necessary.
         *
         * If set_acl() changes permission bits in the process of setting
         * an access ACL, it changes sxp->st.st_mode so we know whether we
         * need to chmod(). */
        if (preserve_acls && !S_ISLNK(new_mode)) {
                if (set_acl(fname, file, sxp, new_mode) > 0)
                        updated |= UPDATED_ACLS;
        }
#endif

#ifdef HAVE_CHMOD
        if (!BITS_EQUAL(sxp->st.st_mode, new_mode, CHMOD_BITS)) {
                int ret = am_root < 0 ? 0 : do_chmod(fname, new_mode);
                if (ret < 0) {
                        rsyserr(FERROR_XFER, errno,
                                "failed to set permissions on %s",
                                full_fname(fname));
                        goto cleanup;
                }
                if (ret == 0) /* ret == 1 if symlink could not be set */
                        updated |= UPDATED_MODE;
        }
#endif

        if (INFO_GTE(NAME, 2) && flags & ATTRS_REPORT) {
                if (updated)
                        rprintf(FCLIENT, "%s\n", fname);
                else
                        rprintf(FCLIENT, "%s is uptodate\n", fname);
        }
  cleanup:
        if (sxp == &sx2)
                free_stat_x(&sx2);
        return updated;
}

/* This is only called for SIGINT, SIGHUP, and SIGTERM. */
void sig_int(int sig_num)
{
        called_from_signal_handler = 1;

        /* KLUGE: if the user hits Ctrl-C while ssh is prompting
         * for a password, then our cleanup's sending of a SIGUSR1
         * signal to all our children may kill ssh before it has a
         * chance to restore the tty settings (i.e. turn echo back
         * on).  By sleeping for a short time, ssh gets a bigger
         * chance to do the right thing.  If child processes are
         * not ssh waiting for a password, then this tiny delay
         * shouldn't hurt anything. */
        msleep(400);

        /* If we're an rsync daemon listener (not a daemon server),
         * we'll exit with status 0 if we received SIGTERM. */
        if (am_daemon && !am_server && sig_num == SIGTERM)
                exit_cleanup(0);

        /* If the signal arrived on the server side (or for the receiver
         * process on the client), we want to try to do a controlled shutdown
         * that lets the client side (generator process) know what happened.
         * To do this, we set a flag and let the normal process handle the
         * shutdown.  We only attempt this if multiplexed IO is in effect and
         * we didn't already set the flag. */
        if (!got_kill_signal && (am_server || am_receiver)) {
                got_kill_signal = sig_num;
                called_from_signal_handler = 0;
                return;
        }

        exit_cleanup(RERR_SIGNAL);
}

/* Finish off a file transfer: renaming the file and setting the file's
 * attributes (e.g. permissions, ownership, etc.).  If the robust_rename()
 * call is forced to copy the temp file and partialptr is both non-NULL and
 * not an absolute path, we stage the file into the partial-dir and then
 * rename it into place.  This returns 1 on success or 0 on failure. */
int finish_transfer(const char *fname, const char *fnametmp,
                    const char *fnamecmp, const char *partialptr,
                    struct file_struct *file, int ok_to_set_time,
                    int overwriting_basis)
{
        int ret;
        const char *temp_copy_name = partialptr && *partialptr != '/' ? partialptr : NULL;

        if (inplace) {
                if (DEBUG_GTE(RECV, 1))
                        rprintf(FINFO, "finishing %s\n", fname);
                fnametmp = fname;
                goto do_set_file_attrs;
        }

        if (make_backups > 0 && overwriting_basis) {
                int ok = make_backup(fname, False);
                if (!ok)
                        exit_cleanup(RERR_FILEIO);
                if (ok == 1 && fnamecmp == fname)
                        fnamecmp = get_backup_name(fname);
        }

        /* Change permissions before putting the file into place. */
        set_file_attrs(fnametmp, file, NULL, fnamecmp,
                       ok_to_set_time ? ATTRS_ACCURATE_TIME : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME | ATTRS_SKIP_CRTIME);

        /* move tmp file over real file */
        if (DEBUG_GTE(RECV, 1))
                rprintf(FINFO, "renaming %s to %s\n", fnametmp, fname);
        ret = robust_rename(fnametmp, fname, temp_copy_name, file->mode);
        if (ret < 0) {
                rsyserr(FERROR_XFER, errno, "%s %s -> \"%s\"",
                        ret == -2 ? "copy" : "rename",
                        full_fname(fnametmp), fname);
                if (!partialptr || (ret == -2 && temp_copy_name)
                 || robust_rename(fnametmp, partialptr, NULL, file->mode) < 0)
                        do_unlink(fnametmp);
                return 0;
        }
        if (ret == 0) {
                /* The file was moved into place (not copied), so it's done. */
                return 1;
        }
        /* The file was copied, so tweak the perms of the copied file.  If it
         * was copied to partialptr, move it into its final destination. */
        fnametmp = temp_copy_name ? temp_copy_name : fname;

  do_set_file_attrs:
        set_file_attrs(fnametmp, file, NULL, fnamecmp,
                       ok_to_set_time ? ATTRS_ACCURATE_TIME : ATTRS_SKIP_MTIME | ATTRS_SKIP_ATIME | ATTRS_SKIP_CRTIME);

        if (temp_copy_name) {
                if (do_rename(fnametmp, fname) < 0) {
                        rsyserr(FERROR_XFER, errno, "rename %s -> \"%s\"",
                                full_fname(fnametmp), fname);
                        return 0;
                }
                handle_partial_dir(temp_copy_name, PDIR_DELETE);
        }
        return 1;
}

struct file_list *flist_for_ndx(int ndx, const char *fatal_error_loc)
{
        struct file_list *flist = cur_flist;

        if (!flist && !(flist = first_flist))
                goto not_found;

        while (ndx < flist->ndx_start-1) {
                if (flist == first_flist)
                        goto not_found;
                flist = flist->prev;
        }
        while (ndx >= flist->ndx_start + flist->used) {
                if (!(flist = flist->next))
                        goto not_found;
        }
        return flist;

  not_found:
        if (fatal_error_loc) {
                int first, last;
                if (first_flist) {
                        first = first_flist->ndx_start - 1;
                        last = first_flist->prev->ndx_start + first_flist->prev->used - 1;
                } else {
                        first = 0;
                        last = -1;
                }
                rprintf(FERROR,
                        "File-list index %d not in %d - %d (%s) [%s]\n",
                        ndx, first, last, fatal_error_loc, who_am_i());
                exit_cleanup(RERR_PROTOCOL);
        }
        return NULL;
}

const char *who_am_i(void)
{
        if (am_starting_up)
                return am_server ? "server" : "client";
        return am_sender ? "sender"
             : am_generator ? "generator"
             : am_receiver ? "receiver"
             : "Receiver"; /* pre-forked receiver */
}