/*      $OpenBSD: unveil-perm.c,v 1.1.1.1 2019/08/01 15:20:51 bluhm Exp $       */
/*
 * Copyright (c) 2019 Alexander Bluhm <bluhm@openbsd.org>
 *
 * 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 <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>

int
main(int argc, char *argv[])
{
        char *perm, *dir, *file, *path = NULL;

        if (argc != 3 && argc != 4)
                errx(2, "usage: unveil-perm perm dir [file]");

        perm = argv[1];
        dir = argv[2];
        file = argv[3];
        if (file != NULL) {
                if (asprintf(&path, "%s/%s", dir, file) == -1)
                        err(1, "asprintf");
        }

        if (unveil(dir, perm) == -1)
                err(1, "unveil %s %s", dir, perm);
        if (file != NULL) {
                if (open(path, O_RDONLY) != -1)
                        errx(1, "open %s succeeded", path);
                if (perm == NULL) {
                        if (errno != ENOENT)
                                err(1, "open %s error", path);
                }
        }

        return 0;
}