/*      $OpenBSD: client.c,v 1.17 2021/06/30 13:10:04 claudio Exp $ */
/*
 * Copyright (c) 2019 Kristaps Dzonsons <kristaps@bsd.lv>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */
#include <sys/stat.h>

#include <assert.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>

#include "extern.h"

/*
 * The rsync client runs on the operator's local machine.
 * It can either be in sender or receiver mode.
 * In the former, it synchronises local files from a remote sink.
 * In the latter, the remote sink synchronses to the local files.
 * Returns exit code 0 on success, 1 on failure, 2 on failure with
 * incompatible protocols.
 */
int
rsync_client(const struct opts *opts, int fd, const struct fargs *f)
{
        struct sess      sess;
        int              rc = 1;

        /* Standard rsync preamble, sender side. */

        if (pledge("stdio unix rpath wpath cpath dpath fattr chown getpw unveil",
            NULL) == -1)
                err(ERR_IPC, "pledge");

        memset(&sess, 0, sizeof(struct sess));
        sess.opts = opts;
        sess.lver = RSYNC_PROTOCOL;

        if (!io_write_int(&sess, fd, sess.lver)) {
                ERRX1("io_write_int");
                goto out;
        } else if (!io_read_int(&sess, fd, &sess.rver)) {
                ERRX1("io_read_int");
                goto out;
        } else if (!io_read_int(&sess, fd, &sess.seed)) {
                ERRX1("io_read_int");
                goto out;
        }

        if (sess.rver < sess.lver) {
                ERRX("remote protocol %d is older than our own %d: unsupported",
                    sess.rver, sess.lver);
                rc = 2;
                goto out;
        }

        LOG2("client detected client version %d, server version %d, seed %d",
            sess.lver, sess.rver, sess.seed);

        sess.mplex_reads = 1;

        /*
         * Now we need to get our list of files.
         * Senders (and locals) send; receivers receive.
         */

        if (f->mode != FARGS_RECEIVER) {
                LOG2("client starting sender: %s",
                    f->host == NULL ? "(local)" : f->host);
                if (!rsync_sender(&sess, fd, fd, f->sourcesz,
                    f->sources)) {
                        ERRX1("rsync_sender");
                        goto out;
                }
        } else {
                LOG2("client starting receiver: %s",
                    f->host == NULL ? "(local)" : f->host);
                if (!rsync_receiver(&sess, fd, fd, f->sink)) {
                        ERRX1("rsync_receiver");
                        goto out;
                }
        }

#if 0
        /* Probably the EOF. */
        if (io_read_check(&sess, fd))
                WARNX("data remains in read pipe");
#endif

        rc = 0;
out:
        return rc;
}