usr.bin/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  * @(#)util.c   8.4 (Berkeley) 4/2/94
  41  * $FreeBSD: src/usr.bin/chpass/util.c,v 1.13 2004/01/18 21:46:39 charnier Exp $
  42  * $DragonFly: src/usr.bin/chpass/util.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
  43  */
  44
  45 #include <sys/types.h>
  46
  47 #include <ctype.h>
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <time.h>
  52 #include <unistd.h>
  53
  54 #include "chpass.h"
  55
  56 static const char *months[] =
  57         { "January", "February", "March", "April", "May", "June",
  58           "July", "August", "September", "October", "November",
  59           "December", NULL };
  60
  61 char *
  62 ttoa(time_t tval)
  63 {
  64         struct tm *tp;
  65         static char tbuf[50];
  66
  67         if (tval) {
  68                 tp = localtime(&tval);
  69                 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(char *p, time_t *store)
  79 {
  80         static struct tm *lt;
  81         char *t;
  82         const char **mp;
  83         time_t tval;
  84         int day, month, year;
  85
  86         if (!*p) {
  87                 *store = 0;
  88                 return (0);
  89         }
  90         if (!lt) {
  91                 unsetenv("TZ");
  92                 time(&tval);
  93                 lt = localtime(&tval);
  94         }
  95         if (!(t = strtok(p, " \t")))
  96                 goto bad;
  97         if (isdigit(*t)) {
  98                 month = atoi(t);
  99         } else {
 100                 for (mp = months;; ++mp) {
 101                         if (!*mp)
 102                                 goto bad;
 103                         if (!strncasecmp(*mp, t, 3)) {
 104                                 month = mp - months + 1;
 105                                 break;
 106                         }
 107                 }
 108         }
 109         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 110                 goto bad;
 111         day = atoi(t);
 112         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 113                 goto bad;
 114         year = atoi(t);
 115         if (day < 1 || day > 31 || month < 1 || month > 12)
 116                 goto bad;
 117         /* Allow two digit years 1969-2068 */
 118         if (year < 69)
 119                 year += 2000;
 120         else if (year < 100)
 121                 year += 1900;
 122         if (year < 1969)
 123 bad:            return (1);
 124         lt->tm_year = year - 1900;
 125         lt->tm_mon = month - 1;
 126         lt->tm_mday = day;
 127         lt->tm_hour = 0;
 128         lt->tm_min = 0;
 129         lt->tm_sec = 0;
 130         lt->tm_isdst = -1;
 131         if ((tval = mktime(lt)) < 0)
 132                 return (1);
 133         *store = tval;
 134         return (0);
 135 }
 136
 137 int
 138 ok_shell(char *name)
 139 {
 140         char *p, *sh;
 141
 142         setusershell();
 143         while ((sh = getusershell())) {
 144                 if (!strcmp(name, sh)) {
 145                         endusershell();
 146                         return (1);
 147                 }
 148                 /* allow just shell name, but use "real" path */
 149                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 150                         endusershell();
 151                         return (1);
 152                 }
 153         }
 154         endusershell();
 155         return (0);
 156 }
 157
 158 char *
 159 dup_shell(char *name)
 160 {
 161         char *p, *sh, *ret;
 162
 163         setusershell();
 164         while ((sh = getusershell())) {
 165                 if (!strcmp(name, sh)) {
 166                         endusershell();
 167                         return (strdup(name));
 168                 }
 169                 /* allow just shell name, but use "real" path */
 170                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 171                         ret = strdup(sh);
 172                         endusershell();
 173                         return (ret);
 174                 }
 175         }
 176         endusershell();
 177         return (NULL);
 178 }