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/* $Id: server.c,v 1.9 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 <fcntl.h>
#include <inttypes.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
#include "extern.h"
static int
fcntl_nonblock(struct sess *sess, int fd)
{
int fl;
if ((fl = fcntl(fd, F_GETFL, 0)) == -1)
ERR(sess, "fcntl: F_GETFL");
else if (fcntl(fd, F_SETFL, fl|O_NONBLOCK) == -1)
ERR(sess, "fcntl: F_SETFL");
else
return 1;
return 0;
}
/*
* The server (remote) side of the system.
* This parses the arguments given it by the remote shell then moves
* into receiver or sender mode depending upon those arguments.
* Returns exit code 0 on success, 1 on failure, 2 on failure with
* incompatible protocols.
*/
int
rsync_server(const struct opts *opts, size_t argc, char *argv[])
{
struct sess sess;
int fdin = STDIN_FILENO,
fdout = STDOUT_FILENO, rc = 1;
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;
/* Begin by making descriptors non-blocking. */
if (!fcntl_nonblock(&sess, fdin) ||
!fcntl_nonblock(&sess, fdout)) {
ERRX1(&sess, "fcntl_nonblock");
goto out;
}
/* Standard rsync preamble, server side. */
sess.lver = RSYNC_PROTOCOL;
sess.seed = arc4random();
if (!io_read_int(&sess, fdin, &sess.rver)) {
ERRX1(&sess, "io_read_int");
goto out;
} else if (!io_write_int(&sess, fdout, sess.lver)) {
ERRX1(&sess, "io_write_int");
goto out;
} else if (!io_write_int(&sess, fdout, sess.seed)) {
ERRX1(&sess, "io_write_int");
goto out;
}
sess.mplex_writes = 1;
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, "server detected client version %" PRId32
", server version %" PRId32 ", seed %" PRId32,
sess.rver, sess.lver, sess.seed);
if (sess.opts->sender) {
LOG2(&sess, "server starting sender");
/*
* At this time, I always get a period as the first
* argument of the command line.
* Let's make it a requirement until I figure out when
* that differs.
* rsync [flags] "." <source> <...>
*/
if (strcmp(argv[0], ".")) {
ERRX(&sess, "first argument must "
"be a standalone period");
goto out;
}
argv++;
argc--;
if (argc == 0) {
ERRX(&sess, "must have arguments");
goto out;
}
if (!rsync_sender(&sess, fdin, fdout, argc, argv)) {
ERRX1(&sess, "rsync_sender");
goto out;
}
} else {
LOG2(&sess, "server starting receiver");
/*
* I don't understand why this calling convention
* exists, but we must adhere to it.
* rsync [flags] "." <destination>
*/
if (argc != 2) {
ERRX(&sess, "server receiver mode "
"requires two argument");
goto out;
} else if (strcmp(argv[0], ".")) {
ERRX(&sess, "first argument must "
"be a standalone period");
goto out;
}
if (!rsync_receiver(&sess, fdin, fdout, argv[1])) {
ERRX1(&sess, "rsync_receiver");
goto out;
}
}
#if 0
/* Probably the EOF. */
if (io_read_check(&sess, fdin))
WARNX(&sess, "data remains in read pipe");
#endif
rc = 0;
out:
return rc;
}
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