usr.bin/chpass/util.c

   1 /*-
   2  * Copyright (c) 1988, 1993, 1994
   3  *      The Regents of the University of California.  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  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#)util.c   8.4 (Berkeley) 4/2/94
  34  * $FreeBSD: src/usr.bin/chpass/util.c,v 1.8.2.1 2002/03/21 10:33:01 cjc Exp $
  35  * $DragonFly: src/usr.bin/chpass/util.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
  36  */
  37
  38 #include <sys/types.h>
  39
  40 #include <ctype.h>
  41 #include <pwd.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <time.h>
  46 #include <unistd.h>
  47
  48 #include "chpass.h"
  49 #include "pathnames.h"
  50
  51 static char *months[] =
  52         { "January", "February", "March", "April", "May", "June",
  53           "July", "August", "September", "October", "November",
  54           "December", NULL };
  55
  56 char *
  57 ttoa(time_t tval)
  58 {
  59         struct tm *tp;
  60         static char tbuf[50];
  61
  62         if (tval) {
  63                 tp = localtime(&tval);
  64                 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  65                     tp->tm_mday, tp->tm_year + 1900);
  66         }
  67         else
  68                 *tbuf = '\0';
  69         return (tbuf);
  70 }
  71
  72 int
  73 atot(char *p, time_t *store)
  74 {
  75         static struct tm *lt;
  76         char *t, **mp;
  77         time_t tval;
  78         int day, month, year;
  79
  80         if (!*p) {
  81                 *store = 0;
  82                 return (0);
  83         }
  84         if (!lt) {
  85                 unsetenv("TZ");
  86                 (void)time(&tval);
  87                 lt = localtime(&tval);
  88         }
  89         if (!(t = strtok(p, " \t")))
  90                 goto bad;
  91         if (isdigit(*t)) {
  92                 month = atoi(t);
  93         } else {
  94                 for (mp = months;; ++mp) {
  95                         if (!*mp)
  96                                 goto bad;
  97                         if (!strncasecmp(*mp, t, 3)) {
  98                                 month = mp - months + 1;
  99                                 break;
 100                         }
 101                 }
 102         }
 103         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 104                 goto bad;
 105         day = atoi(t);
 106         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 107                 goto bad;
 108         year = atoi(t);
 109         if (day < 1 || day > 31 || month < 1 || month > 12)
 110                 goto bad;
 111         /* Allow two digit years 1969-2068 */
 112         if (year < 69)
 113                 year += 2000;
 114         else if (year < 100)
 115                 year += 1900;
 116         if (year < 1969)
 117 bad:            return (1);
 118         lt->tm_year = year - 1900;
 119         lt->tm_mon = month - 1;
 120         lt->tm_mday = day;
 121         lt->tm_hour = 0;
 122         lt->tm_min = 0;
 123         lt->tm_sec = 0;
 124         lt->tm_isdst = -1;
 125         if ((tval = mktime(lt)) < 0)
 126                 return (1);
 127         *store = tval;
 128         return (0);
 129 }
 130
 131 char *
 132 ok_shell(char *name)
 133 {
 134         char *p, *sh;
 135
 136         setusershell();
 137         while ((sh = getusershell())) {
 138                 if (!strcmp(name, sh))
 139                         return (name);
 140                 /* allow just shell name, but use "real" path */
 141                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
 142                         return (sh);
 143         }
 144         return (NULL);
 145 }