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repair exit codes, slightly broken after last commit (please do not go
to an enum, that's just alien).  Documents the return values in each
function and unifies the protocol incompatibility error message.
from kristaps

/*	$Id: client.c,v 1.13 2019/03/23 00:20:55 deraadt 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(1, "pledge");

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

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

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

	LOG2(&sess, "client detected client version %" PRId32
		", server version %" PRId32 ", seed %" PRId32,
		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(&sess, "client starting sender: %s",
		    f->host == NULL ? "(local)" : f->host);
		if (!rsync_sender(&sess, fd, fd, f->sourcesz,
		    f->sources)) {
			ERRX1(&sess, "rsync_sender");
			goto out;
		}
	} else {
		LOG2(&sess, "client starting receiver: %s",
		    f->host == NULL ? "(local)" : f->host);
		if (!rsync_receiver(&sess, fd, fd, f->sink)) {
			ERRX1(&sess, "rsync_receiver");
			goto out;
		}
	}

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

	rc = 0;
out:
	return rc;
}