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
41 static void
usage(void)42 usage(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
50 static id_t
parse_id(char * id)51 parse_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
69 int
main(int argc,char * argv[])70 main(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