1/*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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__FBSDID("$FreeBSD$");
31
32#include <sys/time.h>
33#include <errno.h>
34#include <ctype.h>
35#include <stdio.h>
36#include <stdlib.h>
37#include <string.h>
38#include <utmpx.h>
39
40static int
41b16_pton(const char *in, char *out, size_t len)
42{
43	size_t i;
44
45	for (i = 0; i < len * 2; i++)
46		if (!isxdigit((unsigned char)in[i]))
47			return (1);
48	for (i = 0; i < len; i++)
49		sscanf(&in[i * 2], "%02hhx", &out[i]);
50	return (0);
51}
52
53static int
54rm(char *id[])
55{
56	struct utmpx utx = { .ut_type = DEAD_PROCESS };
57	size_t len;
58	int ret = 0;
59
60	(void)gettimeofday(&utx.ut_tv, NULL);
61	for (; *id != NULL; id++) {
62		len = strlen(*id);
63		if (len <= sizeof(utx.ut_id)) {
64			/* Identifier as string. */
65			strncpy(utx.ut_id, *id, sizeof(utx.ut_id));
66		} else if (len != sizeof(utx.ut_id) * 2 ||
67		    b16_pton(*id, utx.ut_id, sizeof(utx.ut_id)) != 0) {
68			/* Also not hexadecimal. */
69			fprintf(stderr, "%s: Invalid identifier format\n", *id);
70			ret = 1;
71			continue;
72		}
73
74		/* Zap the entry. */
75		if (pututxline(&utx) == NULL) {
76			perror(*id);
77			ret = 1;
78		}
79	}
80	return (ret);
81}
82
83static int
84boot(short type)
85{
86	struct utmpx utx = { .ut_type = type };
87
88	(void)gettimeofday(&utx.ut_tv, NULL);
89	if (pututxline(&utx) == NULL) {
90		perror("pututxline");
91		return (1);
92	}
93	return (0);
94}
95
96int
97main(int argc, char *argv[])
98{
99
100	if (argc == 2 && strcmp(argv[1], "boot") == 0)
101		return (boot(BOOT_TIME));
102	else if (argc == 2 && strcmp(argv[1], "shutdown") == 0)
103		return (boot(SHUTDOWN_TIME));
104	else if (argc >= 3 && strcmp(argv[1], "rm") == 0)
105		return (rm(&argv[2]));
106
107	fprintf(stderr,
108	    "usage: utx boot\n"
109	    "       utx shutdown\n"
110	    "       utx rm identifier ...\n");
111	exit(1);
112}
113