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
  34 #ifndef lint
  35 #if 0
  36 static char sccsid[] = "@(#)util.c      8.4 (Berkeley) 4/2/94";
  37 #endif
  38 static const char rcsid[] =
  39         "$Id$";
  40 #endif /* not lint */
  41
  42 #include <sys/types.h>
  43
  44 #include <ctype.h>
  45 #include <pwd.h>
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49 #include <time.h>
  50 #include <unistd.h>
  51
  52 #include "chpass.h"
  53 #include "pathnames.h"
  54
  55 static char *months[] =
  56         { "January", "February", "March", "April", "May", "June",
  57           "July", "August", "September", "October", "November",
  58           "December", NULL };
  59
  60 char *
  61 ttoa(tval)
  62         time_t tval;
  63 {
  64         struct tm *tp;
  65         static char tbuf[50];
  66
  67         if (tval) {
  68                 tp = localtime(&tval);
  69                 (void)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(p, store)
  79         char *p;
  80         time_t *store;
  81 {
  82         static struct tm *lt;
  83         char *t, **mp;
  84         time_t tval;
  85         int day, month, year;
  86
  87         if (!*p) {
  88                 *store = 0;
  89                 return (0);
  90         }
  91         if (!lt) {
  92                 unsetenv("TZ");
  93                 (void)time(&tval);
  94                 lt = localtime(&tval);
  95         }
  96         if (!(t = strtok(p, " \t")))
  97                 goto bad;
  98         if (isdigit(*t)) {
  99                 month = atoi(t);
 100         } else {
 101                 for (mp = months;; ++mp) {
 102                         if (!*mp)
 103                                 goto bad;
 104                         if (!strncasecmp(*mp, t, 3)) {
 105                                 month = mp - months + 1;
 106                                 break;
 107                         }
 108                 }
 109         }
 110         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 111                 goto bad;
 112         day = atoi(t);
 113         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 114                 goto bad;
 115         year = atoi(t);
 116         if (day < 1 || day > 31 || month < 1 || month > 12 || !year)
 117                 goto bad;
 118         if (year < 100)
 119                 year += 1900;
 120         if (year <= 1970)
 121 bad:            return (1);
 122         lt->tm_year = year - 1900;
 123         lt->tm_mon = month - 1;
 124         lt->tm_mday = day;
 125         lt->tm_hour = 0;
 126         lt->tm_min = 0;
 127         lt->tm_sec = 0;
 128         lt->tm_isdst = -1;
 129         if ((tval = mktime(lt)) < 0)
 130                 return (1);
 131         *store = tval;
 132         return (0);
 133 }
 134
 135 char *
 136 ok_shell(name)
 137         char *name;
 138 {
 139         char *p, *sh;
 140
 141         setusershell();
 142         while ((sh = getusershell())) {
 143                 if (!strcmp(name, sh))
 144                         return (name);
 145                 /* allow just shell name, but use "real" path */
 146                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
 147                         return (sh);
 148         }
 149         return (NULL);
 150 }