xref: /dragonfly/usr.bin/chpass/util.c (revision 19fe1c42)
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  * @(#)util.c	8.4 (Berkeley) 4/2/94
41  * $FreeBSD: src/usr.bin/chpass/util.c,v 1.13 2004/01/18 21:46:39 charnier Exp $
42  * $DragonFly: src/usr.bin/chpass/util.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
43  */
44 
45 #include <sys/types.h>
46 
47 #include <ctype.h>
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 #include <time.h>
52 #include <unistd.h>
53 
54 #include "chpass.h"
55 
56 static const char *months[] =
57 	{ "January", "February", "March", "April", "May", "June",
58 	  "July", "August", "September", "October", "November",
59 	  "December", NULL };
60 
61 char *
62 ttoa(time_t tval)
63 {
64 	struct tm *tp;
65 	static char tbuf[50];
66 
67 	if (tval) {
68 		tp = localtime(&tval);
69 		sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
70 		    tp->tm_mday, tp->tm_year + 1900);
71 	}
72 	else
73 		*tbuf = '\0';
74 	return (tbuf);
75 }
76 
77 int
78 atot(char *p, time_t *store)
79 {
80 	static struct tm *lt;
81 	char *t;
82 	const char **mp;
83 	time_t tval;
84 	int day, month, year;
85 
86 	if (!*p) {
87 		*store = 0;
88 		return (0);
89 	}
90 	if (!lt) {
91 		unsetenv("TZ");
92 		time(&tval);
93 		lt = localtime(&tval);
94 	}
95 	if (!(t = strtok(p, " \t")))
96 		goto bad;
97 	if (isdigit(*t)) {
98 		month = atoi(t);
99 	} else {
100 		for (mp = months;; ++mp) {
101 			if (!*mp)
102 				goto bad;
103 			if (!strncasecmp(*mp, t, 3)) {
104 				month = mp - months + 1;
105 				break;
106 			}
107 		}
108 	}
109 	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
110 		goto bad;
111 	day = atoi(t);
112 	if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
113 		goto bad;
114 	year = atoi(t);
115 	if (day < 1 || day > 31 || month < 1 || month > 12)
116 		goto bad;
117 	/* Allow two digit years 1969-2068 */
118 	if (year < 69)
119 		year += 2000;
120 	else if (year < 100)
121 		year += 1900;
122 	if (year < 1969)
123 bad:		return (1);
124 	lt->tm_year = year - 1900;
125 	lt->tm_mon = month - 1;
126 	lt->tm_mday = day;
127 	lt->tm_hour = 0;
128 	lt->tm_min = 0;
129 	lt->tm_sec = 0;
130 	lt->tm_isdst = -1;
131 	if ((tval = mktime(lt)) < 0)
132 		return (1);
133 	*store = tval;
134 	return (0);
135 }
136 
137 int
138 ok_shell(char *name)
139 {
140 	char *p, *sh;
141 
142 	setusershell();
143 	while ((sh = getusershell())) {
144 		if (!strcmp(name, sh)) {
145 			endusershell();
146 			return (1);
147 		}
148 		/* allow just shell name, but use "real" path */
149 		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
150 			endusershell();
151 			return (1);
152 		}
153 	}
154 	endusershell();
155 	return (0);
156 }
157 
158 char *
159 dup_shell(char *name)
160 {
161 	char *p, *sh, *ret;
162 
163 	setusershell();
164 	while ((sh = getusershell())) {
165 		if (!strcmp(name, sh)) {
166 			endusershell();
167 			return (strdup(name));
168 		}
169 		/* allow just shell name, but use "real" path */
170 		if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
171 			ret = strdup(sh);
172 			endusershell();
173 			return (ret);
174 		}
175 	}
176 	endusershell();
177 	return (NULL);
178 }
179