utx.c revision 218847 
1/*-
2 * Copyright (c) 2011 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: head/usr.sbin/utxrm/utxrm.c 218847 2011-02-19 11:44:04Z ed $");
29
30#include <sys/time.h>
31#include <errno.h>
32#include <ctype.h>
33#include <stdio.h>
34#include <string.h>
35#include <utmpx.h>
36
37static int
38b16_pton(const char *in, char *out, size_t len)
39{
40	size_t i;
41
42	for (i = 0; i < len * 2; i++)
43		if (!isxdigit((unsigned char)in[i]))
44			return (1);
45	for (i = 0; i < len; i++)
46		sscanf(&in[i * 2], "%02hhx", &out[i]);
47	return (0);
48}
49
50int
51main(int argc, char *argv[])
52{
53	struct utmpx utx = { .ut_type = DEAD_PROCESS };
54	size_t len;
55	int i, ret = 0;
56
57	if (argc < 2) {
58		fprintf(stderr, "usage: utxrm identifier ...\n");
59		return (1);
60	}
61
62	gettimeofday(&utx.ut_tv, NULL);
63	for (i = 1; i < argc; i++) {
64		len = strlen(argv[i]);
65		if (len <= sizeof(utx.ut_id)) {
66			/* Identifier as string. */
67			strncpy(utx.ut_id, argv[i], sizeof(utx.ut_id));
68		} else if (len != sizeof(utx.ut_id) * 2 ||
69		    b16_pton(argv[i], utx.ut_id, sizeof(utx.ut_id)) != 0) {
70			/* Also not hexadecimal. */
71			fprintf(stderr, "%s: Invalid identifier format\n",
72			    argv[i]);
73			ret = 1;
74			continue;
75		}
76
77		/* Zap the entry. */
78		if (pututxline(&utx) == NULL) {
79			perror(argv[i]);
80			ret = 1;
81		}
82	}
83	return (ret);
84}
85