1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2013 Hudson River Trading LLC
5 * Written by: John H. Baldwin <[email protected]>
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 __FBSDID("$FreeBSD$");
32
33 #include <sys/procctl.h>
34 #include <sys/types.h>
35 #include <sys/mman.h>
36 #include <err.h>
37 #include <errno.h>
38 #include <stdbool.h>
39 #include <stdio.h>
40 #include <stdlib.h>
41 #include <unistd.h>
42
43 static void
usage(void)44 usage(void)
45 {
46
47 fprintf(stderr, "usage: protect [-i] command\n");
48 fprintf(stderr, " protect [-cdi] -g pgrp | -p pid\n");
49 exit(1);
50 }
51
52 static id_t
parse_id(char * id)53 parse_id(char *id)
54 {
55 static bool first = true;
56 long value;
57 char *ch;
58
59 if (!first) {
60 warnx("only one -g or -p flag is permitted");
61 usage();
62 }
63 value = strtol(id, &ch, 0);
64 if (*ch != '\0') {
65 warnx("invalid process id");
66 usage();
67 }
68 return (value);
69 }
70
71 int
main(int argc,char * argv[])72 main(int argc, char *argv[])
73 {
74 idtype_t idtype;
75 id_t id;
76 int ch, flags;
77 bool descend, inherit, idset;
78
79 idtype = P_PID;
80 id = getpid();
81 flags = PPROT_SET;
82 descend = inherit = idset = false;
83 while ((ch = getopt(argc, argv, "cdig:p:")) != -1)
84 switch (ch) {
85 case 'c':
86 flags = PPROT_CLEAR;
87 break;
88 case 'd':
89 descend = true;
90 break;
91 case 'i':
92 inherit = true;
93 break;
94 case 'g':
95 idtype = P_PGID;
96 id = parse_id(optarg);
97 idset = true;
98 break;
99 case 'p':
100 idtype = P_PID;
101 id = parse_id(optarg);
102 idset = true;
103 break;
104 }
105 argc -= optind;
106 argv += optind;
107
108 if ((idset && argc != 0) || (!idset && (argc == 0 || descend)))
109 usage();
110
111 if (descend)
112 flags |= PPROT_DESCEND;
113 if (inherit)
114 flags |= PPROT_INHERIT;
115 if (procctl(idtype, id, PROC_SPROTECT, &flags) == -1)
116 err(1, "procctl");
117
118 if (argc != 0) {
119 errno = 0;
120 execvp(*argv, argv);
121 err(errno == ENOENT ? 127 : 126, "%s", *argv);
122 }
123 return (0);
124 }
125