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 <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55 #include <time.h>
  56 #include <unistd.h>
  57
  58 #include "chpass.h"
  59
  60 static const char *months[] =
  61         { "January", "February", "March", "April", "May", "June",
  62           "July", "August", "September", "October", "November",
  63           "December", NULL };
  64
  65 char *
  66 ttoa(time_t tval)
  67 {
  68         struct tm *tp;
  69         static char tbuf[50];
  70
  71         if (tval) {
  72                 tp = localtime(&tval);
  73                 (void)sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  74                     tp->tm_mday, tp->tm_year + 1900);
  75         }
  76         else
  77                 *tbuf = '\0';
  78         return (tbuf);
  79 }
  80
  81 int
  82 atot(char *p, time_t *store)
  83 {
  84         static struct tm *lt;
  85         char *t;
  86         const char **mp;
  87         time_t tval;
  88         int day, month, year;
  89
  90         if (!*p) {
  91                 *store = 0;
  92                 return (0);
  93         }
  94         if (!lt) {
  95                 unsetenv("TZ");
  96                 (void)time(&tval);
  97                 lt = localtime(&tval);
  98         }
  99         if (!(t = strtok(p, " \t")))
 100                 goto bad;
 101         if (isdigit(*t)) {
 102                 month = atoi(t);
 103         } else {
 104                 for (mp = months;; ++mp) {
 105                         if (!*mp)
 106                                 goto bad;
 107                         if (!strncasecmp(*mp, t, 3)) {
 108                                 month = mp - months + 1;
 109                                 break;
 110                         }
 111                 }
 112         }
 113         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 114                 goto bad;
 115         day = atoi(t);
 116         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 117                 goto bad;
 118         year = atoi(t);
 119         if (day < 1 || day > 31 || month < 1 || month > 12)
 120                 goto bad;
 121         /* Allow two digit years 1969-2068 */
 122         if (year < 69)
 123                 year += 2000;
 124         else if (year < 100)
 125                 year += 1900;
 126         if (year < 1969)
 127 bad:            return (1);
 128         lt->tm_year = year - 1900;
 129         lt->tm_mon = month - 1;
 130         lt->tm_mday = day;
 131         lt->tm_hour = 0;
 132         lt->tm_min = 0;
 133         lt->tm_sec = 0;
 134         lt->tm_isdst = -1;
 135         if ((tval = mktime(lt)) < 0)
 136                 return (1);
 137         *store = tval;
 138         return (0);
 139 }
 140
 141 int
 142 ok_shell(char *name)
 143 {
 144         char *p, *sh;
 145
 146         setusershell();
 147         while ((sh = getusershell())) {
 148                 if (!strcmp(name, sh)) {
 149                         endusershell();
 150                         return (1);
 151                 }
 152                 /* allow just shell name, but use "real" path */
 153                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 154                         endusershell();
 155                         return (1);
 156                 }
 157         }
 158         endusershell();
 159         return (0);
 160 }
 161
 162 char *
 163 dup_shell(char *name)
 164 {
 165         char *p, *sh, *ret;
 166
 167         setusershell();
 168         while ((sh = getusershell())) {
 169                 if (!strcmp(name, sh)) {
 170                         endusershell();
 171                         return (strdup(name));
 172                 }
 173                 /* allow just shell name, but use "real" path */
 174                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 175                         ret = strdup(sh);
 176                         endusershell();
 177                         return (ret);
 178                 }
 179         }
 180         endusershell();
 181         return (NULL);
 182 }