/*      $OpenBSD: t_unlink.c,v 1.3 2023/10/31 07:59:52 claudio Exp $    */
/* $NetBSD: t_unlink.c,v 1.4 2017/01/14 20:55:26 christos Exp $ */

/*-
 * Copyright (c) 2011 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Jukka Ruohonen.
 *
 * 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 "macros.h"

#include <sys/stat.h>

#include "atf-c.h"
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <string.h>
#include <unistd.h>

static char      path[] = "unlink";

ATF_TC_WITH_CLEANUP(unlink_basic);
ATF_TC_HEAD(unlink_basic, tc)
{
        atf_tc_set_md_var(tc, "descr", "A basic test of unlink(2)");
}

ATF_TC_BODY(unlink_basic, tc)
{
        const size_t n = 512;
        size_t i;
        int fd;

        for (i = 0; i < n; i++) {

                fd = open(path, O_RDWR | O_CREAT, 0666);

                ATF_REQUIRE(fd != -1);
                ATF_REQUIRE(close(fd) == 0);
                ATF_REQUIRE(unlink(path) == 0);

                errno = 0;
                ATF_REQUIRE_ERRNO(ENOENT, open(path, O_RDONLY) == -1);
        }
}

ATF_TC_CLEANUP(unlink_basic, tc)
{
        (void)unlink(path);
}

ATF_TC_WITH_CLEANUP(unlink_err);
ATF_TC_HEAD(unlink_err, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test error conditions of unlink(2)");
}

ATF_TC_BODY(unlink_err, tc)
{
        char buf[PATH_MAX + 1];

        (void)memset(buf, 'x', sizeof(buf));

        errno = 0;
        ATF_REQUIRE(unlink("/") == -1);

        errno = 0;
        ATF_REQUIRE_ERRNO(ENAMETOOLONG, unlink(buf) == -1);

        errno = 0;
        ATF_REQUIRE_ERRNO(ENOENT, unlink("/a/b/c/d/e/f/g/h/i/j/k/l/m") == -1);
}

ATF_TC_CLEANUP(unlink_err, tc)
{
        (void)unlink(path);
}

ATF_TC_WITH_CLEANUP(unlink_fifo);
ATF_TC_HEAD(unlink_fifo, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test unlink(2) for a FIFO");
}

ATF_TC_BODY(unlink_fifo, tc)
{

        ATF_REQUIRE(mkfifo(path, 0666) == 0);
        ATF_REQUIRE(unlink(path) == 0);

        errno = 0;
        ATF_REQUIRE_ERRNO(ENOENT, open(path, O_RDONLY) == -1);
}

ATF_TC_CLEANUP(unlink_fifo, tc)
{
        (void)unlink(path);
}

ATF_TC_WITH_CLEANUP(unlink_perm);
ATF_TC_HEAD(unlink_perm, tc)
{
        atf_tc_set_md_var(tc, "descr", "Test permissions with unlink(2)");
        atf_tc_set_md_var(tc, "require.user", "unprivileged");
}

ATF_TC_BODY(unlink_perm, tc)
{
        int rv;

        errno = 0;
        rv = unlink("/etc");
        ATF_REQUIRE_MSG(rv == -1 && (errno == EACCES || errno == EPERM),
            "unlinking a directory did not fail with EPERM or EACCESS; "
            "unlink() returned %d, errno %d", rv, errno);

        errno = 0;
        ATF_REQUIRE_ERRNO(EACCES, unlink("/root/.profile") == -1);
}

ATF_TC_CLEANUP(unlink_perm, tc)
{
        (void)unlink(path);
}

ATF_TP_ADD_TCS(tp)
{

        ATF_TP_ADD_TC(tp, unlink_basic);
        ATF_TP_ADD_TC(tp, unlink_err);
        ATF_TP_ADD_TC(tp, unlink_fifo);
        ATF_TP_ADD_TC(tp, unlink_perm);

        return atf_no_error();
}