1/*-
2 * Copyright (c) 2011-2012 Ed Schouten <ed@FreeBSD.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD$");
29
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
38static int
39b16_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
51static int
52rm(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
81static int
82boot(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
94int
95main(int argc, char *argv[])
96{
97
98	if (argc >= 2 && strcmp(getprogname(), "utxrm") == 0)
99		/* For compatibility. */
100		return (rm(&argv[1]));
101	else if (argc == 2 && strcmp(argv[1], "boot") == 0)
102		return (boot(BOOT_TIME));
103	else if (argc == 2 && strcmp(argv[1], "shutdown") == 0)
104		return (boot(SHUTDOWN_TIME));
105	else if (argc >= 3 && strcmp(argv[1], "rm") == 0)
106		return (rm(&argv[2]));
107
108	fprintf(stderr,
109	    "usage: utx boot\n"
110	    "       utx shutdown\n"
111	    "       utx rm identifier ...\n"
112	    "       utxrm identifier ...\n");
113	exit(1);
114}
115