/*      $NetBSD: t_proccwd.c,v 1.2 2019/06/01 22:18:23 kamil Exp $      */
/*-
* Copyright (c) 2019 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/cdefs.h>
__COPYRIGHT("@(#) Copyright (c) 2019\
The NetBSD Foundation, inc. All rights reserved.");
__RCSID("$NetBSD: t_proccwd.c,v 1.2 2019/06/01 22:18:23 kamil Exp $");

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/sysctl.h>
#include <sys/wait.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <err.h>

#include <atf-c.h>

static int
getproccwd(char *path, size_t *len, pid_t pid)
{
       const int name[] = {
           CTL_KERN, KERN_PROC_ARGS, pid, KERN_PROC_CWD,
       };

       return sysctl(name, __arraycount(name), path, len, NULL, 0);
}

ATF_TC(prompt_pid);
ATF_TC_HEAD(prompt_pid, tc)
{

       atf_tc_set_md_var(tc, "descr",
           "Prompt length of the current dir and assert that it is sane");
}

ATF_TC_BODY(prompt_pid, tc)
{
       char buf[MAXPATHLEN];
       char cwdbuf[MAXPATHLEN];
       size_t len, prompted_len;
       size_t i;

       pid_t t[] = {
               -1,
               getpid(),
               1 /* /sbin/init */
       };

       for (i = 0; i < __arraycount(t); i++) {
               len = 0;
               ATF_REQUIRE_EQ(getproccwd(NULL, &len, t[i]), 0);

               prompted_len = len;
               ATF_REQUIRE_EQ(getproccwd(buf, &len, t[i]), 0);

               ATF_REQUIRE_EQ(strlen(buf) + 1, prompted_len);
               ATF_REQUIRE(strlen(buf) > 0);

               if (t[i] == -1 || t[i] == getpid()) {
                       getcwd(cwdbuf, MAXPATHLEN);
                       ATF_REQUIRE_EQ(strcmp(buf, cwdbuf), 0);
                       ATF_REQUIRE(strlen(buf) > strlen("/"));
               } else if (t[i] == 1) {
                       ATF_REQUIRE_EQ(strcmp(buf, "/"), 0);
               }
       }
}

ATF_TC(chroot);
ATF_TC_HEAD(chroot, tc)
{

       atf_tc_set_md_var(tc, "descr",
           "prompt length of the current dir and assert that it is right");

       atf_tc_set_md_var(tc, "require.user", "root");
}

#define ASSERT(x) do { if (!(x)) _exit(EXIT_FAILURE); } while (0)

ATF_TC_BODY(chroot, tc)
{
       char buf[MAXPATHLEN];
       struct stat root_dir;
       struct stat cur_dir;
       size_t len;
       pid_t child, wpid;
       int status;
       int rv;

       const pid_t pid_one = 1; /* /sbin/init */

       ATF_REQUIRE(getcwd(buf, sizeof(buf)) != NULL);

       ATF_REQUIRE_EQ(stat(buf, &cur_dir), 0);
       ATF_REQUIRE_EQ(stat("/", &root_dir), 0);

       if (cur_dir.st_ino == root_dir.st_ino)
               atf_tc_skip("This test does not work in /");

       child = atf_utils_fork();
       if (child == 0) {
               len = 0;

               ASSERT(chroot(buf) == 0);

               errno = 0;
               rv = getproccwd(buf, &len, pid_one);
               ASSERT(rv == -1);
               ASSERT(errno == ENOENT);

               _exit(EXIT_SUCCESS);
       }
       wpid = waitpid(child, &status, WEXITED);
       ATF_REQUIRE_EQ(wpid, child);
       ATF_REQUIRE_EQ(WEXITSTATUS(status), EXIT_SUCCESS);
}

ATF_TP_ADD_TCS(tp)
{

       ATF_TP_ADD_TC(tp, prompt_pid);
       ATF_TP_ADD_TC(tp, chroot);

       return atf_no_error();
}