/*      $OpenBSD: execpromise.c,v 1.2 2021/12/13 18:04:28 deraadt Exp $ */
/*
 * Copyright (c) 2017 Florian Obser <florian@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 <sys/types.h>
#include <sys/socket.h>

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

int
main(int argc, char **argv)
{
        int ch, child = 0, s;
        char **oargv = argv;

        while ((ch = getopt(argc, argv, "C")) != -1) {
                switch (ch) {
                case 'C':
                        child = 1;
                        break;
                default:
                        errx(1, "");
                }
        }
        argc -= optind;
        argv += optind;

        if (child ==1) {
                warnx("child");
                if (argc > 1)
                        errx(1, "argc: %d", argc);
                if (argc == 1) {
                        warnx("plege(\"%s\",\"\")", argv[0]);
                        if (pledge(argv[0], "") == -1)
                                err(24, "child pledge");
                }

                warnx("trying to open socket");

                s = socket(AF_INET, SOCK_DGRAM, 0);
                if (s == -1)
                        err(23, "open");
                else
                        warnx("opened socket");

                close(s);
                exit(0);
        } else {
                warnx("parent");
                if (argc == 2)
                        warnx("execpromise: \"%s\", child pledge: \"%s\"",
                            argv[0], argv[1]);
                else if (argc == 1)
                        warnx("execpromise: \"%s\"", argv[0]);
                else
                        errx(1, "argc out of range");

                if (pledge("stdio exec", argv[0]) == -1)
                        err(1, "parent pledge");

                oargv[1] = "-C";
                execvp(oargv[0], &oargv[0]);
                err((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
        }
}