1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2011-2012 Ed Schouten <ed@FreeBSD.org>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29 #include <sys/cdefs.h>
30 #include <sys/time.h>
31 #include <errno.h>
32 #include <ctype.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <string.h>
36 #include <utmpx.h>
37
38 static int
b16_pton(const char * in,char * out,size_t len)39 b16_pton(const char *in, char *out, size_t len)
40 {
41 size_t i;
42
43 for (i = 0; i < len * 2; i++)
44 if (!isxdigit((unsigned char)in[i]))
45 return (1);
46 for (i = 0; i < len; i++)
47 sscanf(&in[i * 2], "%02hhx", &out[i]);
48 return (0);
49 }
50
51 static int
rm(char * id[])52 rm(char *id[])
53 {
54 struct utmpx utx = { .ut_type = DEAD_PROCESS };
55 size_t len;
56 int ret = 0;
57
58 (void)gettimeofday(&utx.ut_tv, NULL);
59 for (; *id != NULL; id++) {
60 len = strlen(*id);
61 if (len <= sizeof(utx.ut_id)) {
62 /* Identifier as string. */
63 strncpy(utx.ut_id, *id, sizeof(utx.ut_id));
64 } else if (len != sizeof(utx.ut_id) * 2 ||
65 b16_pton(*id, utx.ut_id, sizeof(utx.ut_id)) != 0) {
66 /* Also not hexadecimal. */
67 fprintf(stderr, "%s: Invalid identifier format\n", *id);
68 ret = 1;
69 continue;
70 }
71
72 /* Zap the entry. */
73 if (pututxline(&utx) == NULL) {
74 perror(*id);
75 ret = 1;
76 }
77 }
78 return (ret);
79 }
80
81 static int
boot(short type)82 boot(short type)
83 {
84 struct utmpx utx = { .ut_type = type };
85
86 (void)gettimeofday(&utx.ut_tv, NULL);
87 if (pututxline(&utx) == NULL) {
88 perror("pututxline");
89 return (1);
90 }
91 return (0);
92 }
93
94 int
main(int argc,char * argv[])95 main(int argc, char *argv[])
96 {
97
98 if (argc == 2 && strcmp(argv[1], "boot") == 0)
99 return (boot(BOOT_TIME));
100 else if (argc == 2 && strcmp(argv[1], "shutdown") == 0)
101 return (boot(SHUTDOWN_TIME));
102 else if (argc >= 3 && strcmp(argv[1], "rm") == 0)
103 return (rm(&argv[2]));
104
105 fprintf(stderr,
106 "usage: utx boot\n"
107 " utx shutdown\n"
108 " utx rm identifier ...\n");
109 exit(1);
110 }
111