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. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#)util.c   8.4 (Berkeley) 4/2/94
  37  * $FreeBSD: src/usr.bin/chpass/util.c,v 1.13 2004/01/18 21:46:39 charnier Exp $
  38  * $DragonFly: src/usr.bin/chpass/util.c,v 1.3 2003/10/02 17:42:26 hmp Exp $
  39  */
  40
  41 #include <sys/types.h>
  42
  43 #include <ctype.h>
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47 #include <time.h>
  48 #include <unistd.h>
  49
  50 #include "chpass.h"
  51
  52 static const char *months[] =
  53         { "January", "February", "March", "April", "May", "June",
  54           "July", "August", "September", "October", "November",
  55           "December", NULL };
  56
  57 char *
  58 ttoa(time_t tval)
  59 {
  60         struct tm *tp;
  61         static char tbuf[50];
  62
  63         if (tval) {
  64                 tp = localtime(&tval);
  65                 sprintf(tbuf, "%s %d, %d", months[tp->tm_mon],
  66                     tp->tm_mday, tp->tm_year + 1900);
  67         }
  68         else
  69                 *tbuf = '\0';
  70         return (tbuf);
  71 }
  72
  73 int
  74 atot(char *p, time_t *store)
  75 {
  76         static struct tm *lt;
  77         char *t;
  78         const char **mp;
  79         time_t tval;
  80         int day, month, year;
  81
  82         if (!*p) {
  83                 *store = 0;
  84                 return (0);
  85         }
  86         if (!lt) {
  87                 unsetenv("TZ");
  88                 time(&tval);
  89                 lt = localtime(&tval);
  90         }
  91         if (!(t = strtok(p, " \t")))
  92                 goto bad;
  93         if (isdigit(*t)) {
  94                 month = atoi(t);
  95         } else {
  96                 for (mp = months;; ++mp) {
  97                         if (!*mp)
  98                                 goto bad;
  99                         if (!strncasecmp(*mp, t, 3)) {
 100                                 month = mp - months + 1;
 101                                 break;
 102                         }
 103                 }
 104         }
 105         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 106                 goto bad;
 107         day = atoi(t);
 108         if (!(t = strtok(NULL, " \t,")) || !isdigit(*t))
 109                 goto bad;
 110         year = atoi(t);
 111         if (day < 1 || day > 31 || month < 1 || month > 12)
 112                 goto bad;
 113         /* Allow two digit years 1969-2068 */
 114         if (year < 69)
 115                 year += 2000;
 116         else if (year < 100)
 117                 year += 1900;
 118         if (year < 1969)
 119 bad:            return (1);
 120         lt->tm_year = year - 1900;
 121         lt->tm_mon = month - 1;
 122         lt->tm_mday = day;
 123         lt->tm_hour = 0;
 124         lt->tm_min = 0;
 125         lt->tm_sec = 0;
 126         lt->tm_isdst = -1;
 127         if ((tval = mktime(lt)) < 0)
 128                 return (1);
 129         *store = tval;
 130         return (0);
 131 }
 132
 133 int
 134 ok_shell(char *name)
 135 {
 136         char *p, *sh;
 137
 138         setusershell();
 139         while ((sh = getusershell())) {
 140                 if (!strcmp(name, sh)) {
 141                         endusershell();
 142                         return (1);
 143                 }
 144                 /* allow just shell name, but use "real" path */
 145                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 146                         endusershell();
 147                         return (1);
 148                 }
 149         }
 150         endusershell();
 151         return (0);
 152 }
 153
 154 char *
 155 dup_shell(char *name)
 156 {
 157         char *p, *sh, *ret;
 158
 159         setusershell();
 160         while ((sh = getusershell())) {
 161                 if (!strcmp(name, sh)) {
 162                         endusershell();
 163                         return (strdup(name));
 164                 }
 165                 /* allow just shell name, but use "real" path */
 166                 if ((p = strrchr(sh, '/')) && strcmp(name, p + 1) == 0) {
 167                         ret = strdup(sh);
 168                         endusershell();
 169                         return (ret);
 170                 }
 171         }
 172         endusershell();
 173         return (NULL);
 174 }