util.c revision 331722 
1/*-
2 * Copyright (c) 1988, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 * Copyright (c) 2002 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 *	This product includes software developed by the University of
23 *	California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 */
40
41#ifndef lint
42#if 0
43static char sccsid[] = "@(#)util.c	8.4 (Berkeley) 4/2/94";
44#endif
45#endif /* not lint */
46#include <sys/cdefs.h>
47__FBSDID("$FreeBSD: stable/11/usr.bin/chpass/util.c 331722 2018-03-29 02:50:57Z eadler $");
48
49#include <sys/types.h>
50
51#include <ctype.h>
52#include <stdio.h>
53#include <stdlib.h>
54#include <string.h>
55#include <time.h>
56#include <unistd.h>
57
58#include "chpass.h"
59
60static const char *months[] =
61	{ "January", "February", "March", "April", "May", "June",
62	  "July", "August", "September", "October", "November",
63	  "December", NULL };
64
65char *
66ttoa(time_t tval)
67{
68	struct tm *tp;
69	static char tbuf[50];
70
71	if (tval) {
72		tp = localtime(&tval);
73		(void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
74		    tp->tm_mday, tp->tm_year + 1900);
75	}
76	else
77		*tbuf = '\0';
78	return (tbuf);
79}
80
81int
82atot(char *p, time_t *store)
83{
84	static struct tm *lt;
85	char *t;
86	const char **mp;
87	time_t tval;
88	int day, month, year;
89
90	if (!*p) {
91		*store = 0;
92		return (0);
93	}
94	if (!lt) {
95		unsetenv("TZ");
96		(void)time(&tval);
97		lt = localtime(&tval);
98	}
99	if (!(t = strtok(p, " \t")))
100		goto bad;
101	if (isdigit(*t)) {
102		month = atoi(t);
103	} else {
104		for (mp = months;; ++mp) {
105			if (!*mp)
106				goto bad;
107			if (!strncasecmp(*mp, t, 3)) {
108				month = mp - months + 1;
109				break;
110			}
111		}
112	}
113	if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
114		goto bad;
115	day = atoi(t);
116	if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
117		goto bad;
118	year = atoi(t);
119	if (day < 1 || day > 31 || month < 1 || month > 12)
120		goto bad;
121	/* Allow two digit years 1969-2068 */
122	if (year < 69)
123		year += 2000;
124	else if (year < 100)
125		year += 1900;
126	if (year < 1969)
127bad:		return (1);
128	lt->tm_year = year - 1900;
129	lt->tm_mon = month - 1;
130	lt->tm_mday = day;
131	lt->tm_hour = 0;
132	lt->tm_min = 0;
133	lt->tm_sec = 0;
134	lt->tm_isdst = -1;
135	if ((tval = mktime(lt)) < 0)
136		return (1);
137	*store = tval;
138	return (0);
139}
140
141int
142ok_shell(char *name)
143{
144	char *p, *sh;
145
146	setusershell();
147	while ((sh = getusershell())) {
148		if (!strcmp(name, sh)) {
149			endusershell();
150			return (1);
151		}
152		/* allow just shell name, but use "real" path */
153		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
154			endusershell();
155			return (1);
156		}
157	}
158	endusershell();
159	return (0);
160}
161
162char *
163dup_shell(char *name)
164{
165	char *p, *sh, *ret;
166
167	setusershell();
168	while ((sh = getusershell())) {
169		if (!strcmp(name, sh)) {
170			endusershell();
171			return (strdup(name));
172		}
173		/* allow just shell name, but use "real" path */
174		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
175			ret = strdup(sh);
176			endusershell();
177			return (ret);
178		}
179	}
180	endusershell();
181	return (NULL);
182}
183