1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2013 Hudson River Trading LLC
5 * Written by: John H. Baldwin <jhb@FreeBSD.org>
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#include <sys/cdefs.h>
31#include <sys/procctl.h>
32#include <sys/types.h>
33#include <sys/mman.h>
34#include <err.h>
35#include <errno.h>
36#include <stdbool.h>
37#include <stdio.h>
38#include <stdlib.h>
39#include <unistd.h>
40
41static void
42usage(void)
43{
44
45	fprintf(stderr, "usage: protect [-i] command\n");
46	fprintf(stderr, "       protect [-cdi] -g pgrp | -p pid\n");
47	exit(1);
48}
49
50static id_t
51parse_id(char *id)
52{
53	static bool first = true;
54	long value;
55	char *ch;
56
57	if (!first) {
58		warnx("only one -g or -p flag is permitted");
59		usage();
60	}
61	value = strtol(id, &ch, 0);
62	if (*ch != '\0') {
63		warnx("invalid process id");
64		usage();
65	}
66	return (value);
67}
68
69int
70main(int argc, char *argv[])
71{
72	idtype_t idtype;
73	id_t id;
74	int ch, flags;
75	bool descend, inherit, idset;
76
77	idtype = P_PID;
78	id = getpid();
79	flags = PPROT_SET;
80	descend = inherit = idset = false;
81	while ((ch = getopt(argc, argv, "cdig:p:")) != -1)
82		switch (ch) {
83		case 'c':
84			flags = PPROT_CLEAR;
85			break;
86		case 'd':
87			descend = true;
88			break;
89		case 'i':
90			inherit = true;
91			break;
92		case 'g':
93			idtype = P_PGID;
94			id = parse_id(optarg);
95			idset = true;
96			break;
97		case 'p':
98			idtype = P_PID;
99			id = parse_id(optarg);
100			idset = true;
101			break;
102		}
103	argc -= optind;
104	argv += optind;
105
106	if ((idset && argc != 0) || (!idset && (argc == 0 || descend)))
107		usage();
108
109	if (descend)
110		flags |= PPROT_DESCEND;
111	if (inherit)
112		flags |= PPROT_INHERIT;
113	if (procctl(idtype, id, PROC_SPROTECT, &flags) == -1)
114		err(1, "procctl");
115
116	if (argc != 0) {
117		errno = 0;
118		execvp(*argv, argv);
119		err(errno == ENOENT ? 127 : 126, "%s", *argv);
120	}
121	return (0);
122}
123