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 static const char sccsid[] = "@(#)util.c        8.4 (Berkeley) 4/2/94";
  36 #endif /* not lint */
  37
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$");
  40
  41 #include <sys/types.h>
  42
  43 #include <ctype.h>
  44 #include <pwd.h>
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <time.h>
  49 #include <unistd.h>
  50
  51 #include "chpass.h"
  52 #include "pathnames.h"
  53
  54 static const char *months[] =
  55         { "January", "February", "March", "April", "May", "June",
  56           "July", "August", "September", "October", "November",
  57           "December", NULL };
  58
  59 char *
  60 ttoa(time_t tval)
  61 {
  62         struct tm *tp;
  63         static char tbuf[50];
  64
  65         if (tval) {
  66                 tp = localtime(&tval);
  67                 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  68                     tp->tm_mday, tp->tm_year + 1900);
  69         }
  70         else
  71                 *tbuf = '\0';
  72         return (tbuf);
  73 }
  74
  75 int
  76 atot(char *p, time_t *store)
  77 {
  78         static struct tm *lt;
  79         char *t;
  80         const char **mp;
  81         time_t tval;
  82         int day, month, year;
  83
  84         if (!*p) {
  85                 *store = 0;
  86                 return (0);
  87         }
  88         if (!lt) {
  89                 unsetenv("TZ");
  90                 (void)time(&tval);
  91                 lt = localtime(&tval);
  92         }
  93         if (!(t = strtok(p, " \t")))
  94                 goto bad;
  95         if (isdigit(*t)) {
  96                 month = atoi(t);
  97         } else {
  98                 for (mp = months;; ++mp) {
  99                         if (!*mp)
 100                                 goto bad;
 101                         if (!strncasecmp(*mp, t, 3)) {
 102                                 month = mp - months + 1;
 103                                 break;
 104                         }
 105                 }
 106         }
 107         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 108                 goto bad;
 109         day = atoi(t);
 110         if (!(t = strtok((char *)NULL, " \t,")) || !isdigit(*t))
 111                 goto bad;
 112         year = atoi(t);
 113         if (day < 1 || day > 31 || month < 1 || month > 12)
 114                 goto bad;
 115         /* Allow two digit years 1969-2068 */
 116         if (year < 69)
 117                 year += 2000;
 118         else if (year < 100)
 119                 year += 1900;
 120         if (year < 1969)
 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(char *name)
 137 {
 138         char *p, *sh;
 139
 140         setusershell();
 141         while ((sh = getusershell())) {
 142                 if (!strcmp(name, sh))
 143                         return (name);
 144                 /* allow just shell name, but use "real" path */
 145                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0)
 146                         return (sh);
 147         }
 148         return (NULL);
 149 }