xref: /freebsd/usr.sbin/utx/utx.c (revision ab0b9f6b3073e6c4d1dfbf07444d7db67a189a96)
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 
38 static int
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
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
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
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