NetBSD/tests/rump/rumpkern/t_modcmd.c

/*	$NetBSD: t_modcmd.c,v 1.10 2017/01/13 21:30:43 christos Exp $	*/

/*
 * Copyright (c) 2009 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND
 * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
 * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
 * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/mount.h>
#include <sys/sysctl.h>

#include <rump/rump.h>
#include <rump/rump_syscalls.h>

#include <fs/tmpfs/tmpfs_args.h>

#include <atf-c.h>
#include <dlfcn.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

#include "h_macros.h"
/*
 * We verify that modules can be loaded and unloaded.
 * tmpfs was chosen because it does not depend on an image.
 */

ATF_TC(cmsg_modcmd);
ATF_TC_HEAD(cmsg_modcmd, tc)
{
	atf_tc_set_md_var(tc, "descr", "Checks that loading and unloading "
	    "a module (vfs/tmpfs) is possible");
}

static int
disable_autoload(void)
{
	struct sysctlnode q, ans[256];
	int mib[3];
	size_t alen;
	unsigned i;
	bool no;

	mib[0] = CTL_KERN;
	mib[1] = CTL_QUERY;
	alen = sizeof(ans);

	memset(&q, 0, sizeof(q));
	q.sysctl_flags = SYSCTL_VERSION;

	if (rump_sys___sysctl(mib, 2, ans, &alen, &q, sizeof(q)) == -1)
		return -1;

	for (i = 0; i < __arraycount(ans); i++)
		if (strcmp("module", ans[i].sysctl_name) == 0)
			break;
	if (i == __arraycount(ans)) {
		errno = ENOENT;
		return -1;
	}

	mib[1] = ans[i].sysctl_num;
	mib[2] = CTL_QUERY;

	if (rump_sys___sysctl(mib, 3, ans, &alen, &q, sizeof(q)) == -1)
		return errno;

	for (i = 0; i < __arraycount(ans); i++)
		if (strcmp("autoload", ans[i].sysctl_name) == 0)
			break;
	if (i == __arraycount(ans)) {
		errno = ENOENT;
		return -1;
	}

	mib[2] = ans[i].sysctl_num;

	no = false;
	alen = 0;
	if (rump_sys___sysctl(mib, 3, NULL, &alen, &no, sizeof(no)) == -1)
		return errno;

	return 0;

}

#define TMPFSMODULE "librumpfs_tmpfs.so"
ATF_TC_BODY(cmsg_modcmd, tc)
{
	struct tmpfs_args args;
	const struct modinfo *const *mi_start, *const *mi_end;
	void *handle;
	int i, rv, loop = 0;

	rump_init();

	if (disable_autoload() == -1)
		atf_tc_fail_errno("count not disable module autoload");

	memset(&args, 0, sizeof(args));
	args.ta_version = TMPFS_ARGS_VERSION;
	args.ta_root_mode = 0777;
	
	if (rump_sys_mkdir("/mp", 0777) == -1)
		atf_tc_fail_errno("mkdir mountpoint");
	if (rump_sys_mount(MOUNT_TMPFS, "/mp", 0, &args, sizeof(args)) != -1)
		atf_tc_fail("mount unexpectedly succeeded");

	handle = dlopen(TMPFSMODULE, RTLD_GLOBAL);
	if (handle == NULL) {
		const char *dlmsg = dlerror();
		atf_tc_fail("cannot open %s: %s", TMPFSMODULE, dlmsg);
	}

 again:
	mi_start = dlsym(handle, "__start_link_set_modules");
	mi_end = dlsym(handle, "__stop_link_set_modules");
	if (mi_start == NULL || mi_end == NULL)
		atf_tc_fail("cannot find module info");
	if ((rv = rump_pub_module_init(mi_start, (size_t)(mi_end-mi_start)))!=0)
		atf_tc_fail("module init failed: %d (%s)", rv, strerror(rv));
	if ((rv = rump_pub_module_init(mi_start, (size_t)(mi_end-mi_start)))==0)
		atf_tc_fail("module double init succeeded");

	if (rump_sys_mount(MOUNT_TMPFS, "/mp", 0, &args, sizeof(args)) == -1)
		atf_tc_fail_errno("still cannot mount");
	if (rump_sys_unmount("/mp", 0) == -1)
		atf_tc_fail("cannot unmount");
	for (i = 0; i < (int)(mi_end-mi_start); i++) {
		if ((rv = rump_pub_module_fini(mi_start[i])) != 0)
			atf_tc_fail("module fini failed: %d (%s)",
			    rv, strerror(rv));
	}
	for (i = 0; i < (int)(mi_end-mi_start); i++) {
		if ((rv = rump_pub_module_fini(mi_start[i])) == 0)
			atf_tc_fail("module double fini succeeded");
	}
	if (loop++ == 0)
		goto again;

	if (dlclose(handle)) {
		const char *dlmsg = dlerror();
		atf_tc_fail("cannot close %s: %s", TMPFSMODULE, dlmsg);
	}

	if (rump_sys_mount(MOUNT_TMPFS, "/mp", 0, &args, sizeof(args)) != -1)
		atf_tc_fail("mount unexpectedly succeeded");
}

ATF_TP_ADD_TCS(tp)
{
	ATF_TP_ADD_TC(tp, cmsg_modcmd);

	return atf_no_error();
}