chpass/util.c

   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
  43 static char sccsid[] = "@(#)util.c      8.4 (Berkeley) 4/2/94";
  44 #endif
  45 #endif /* not lint */
  46 #include <sys/cdefs.h>
  47 __FBSDID("$FreeBSD$");
  48
  49 #include <sys/types.h>
  50
  51 #include <ctype.h>
  52 #include <pwd.h>
  53 #include <stdio.h>
  54 #include <stdlib.h>
  55 #include <string.h>
  56 #include <time.h>
  57 #include <unistd.h>
  58
  59 #include "chpass.h"
  60
  61 static const char *months[] =
  62         { "January", "February", "March", "April", "May", "June",
  63           "July", "August", "September", "October", "November",
  64           "December", NULL };
  65
  66 char *
  67 ttoa(time_t tval)
  68 {
  69         struct tm *tp;
  70         static char tbuf[50];
  71
  72         if (tval) {
  73                 tp = localtime(&tval);
  74                 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  75                     tp->tm_mday, tp->tm_year + 1900);
  76         }
  77         else
  78                 *tbuf = '\0';
  79         return (tbuf);
  80 }
  81
  82 int
  83 atot(char *p, time_t *store)
  84 {
  85         static struct tm *lt;
  86         char *t;
  87         const char **mp;
  88         time_t tval;
  89         int day, month, year;
  90
  91         if (!*p) {
  92                 *store = 0;
  93                 return (0);
  94         }
  95         if (!lt) {
  96                 unsetenv("TZ");
  97                 (void)time(&tval);
  98                 lt = localtime(&tval);
  99         }
 100         if (!(t = strtok(p, " \t")))
 101                 goto bad;
 102         if (isdigit(*t)) {
 103                 month = atoi(t);
 104         } else {
 105                 for (mp = months;; ++mp) {
 106                         if (!*mp)
 107                                 goto bad;
 108                         if (!strncasecmp(*mp, t, 3)) {
 109                                 month = mp - months + 1;
 110                                 break;
 111                         }
 112                 }
 113         }
 114         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 115                 goto bad;
 116         day = atoi(t);
 117         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 118                 goto bad;
 119         year = atoi(t);
 120         if (day < 1 || day > 31 || month < 1 || month > 12)
 121                 goto bad;
 122         /* Allow two digit years 1969-2068 */
 123         if (year < 69)
 124                 year += 2000;
 125         else if (year < 100)
 126                 year += 1900;
 127         if (year < 1969)
 128 bad:            return (1);
 129         lt->tm_year = year - 1900;
 130         lt->tm_mon = month - 1;
 131         lt->tm_mday = day;
 132         lt->tm_hour = 0;
 133         lt->tm_min = 0;
 134         lt->tm_sec = 0;
 135         lt->tm_isdst = -1;
 136         if ((tval = mktime(lt)) < 0)
 137                 return (1);
 138         *store = tval;
 139         return (0);
 140 }
 141
 142 char *
 143 ok_shell(char *name)
 144 {
 145         char *p, *sh;
 146
 147         setusershell();
 148         while ((sh = getusershell())) {
 149                 if (!strcmp(name, sh))
 150                         return (name);
 151                 /* allow just shell name, but use "real" path */
 152                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
 153                         return (sh);
 154         }
 155         return (NULL);
 156 }