lib/libutil/login_times.c

   1 /*-
   2  * Copyright (c) 1996 by
   3  * David Nugent <davidn@blaze.net.au>
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, is permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice immediately at the beginning of the file, without modification,
  11  *    this list of conditions, and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. This work was done expressly for inclusion into FreeBSD.  Other use
  16  *    is permitted provided this notation is included.
  17  * 4. Absolutely no warranty of function or purpose is made by the authors.
  18  * 5. Modifications may be freely made to this file providing the above
  19  *    conditions are met.
  20  *
  21  * Login period parsing and comparison functions.
  22  *
  23  * $FreeBSD: head/lib/libutil/login_times.c 252376 2013-06-29 15:52:48Z kientzle $
  24  */
  25
  26 #include <sys/types.h>
  27 #include <ctype.h>
  28 #include <login_cap.h>
  29 #include <stdlib.h>
  30 #include <string.h>
  31 #include <time.h>
  32
  33 static struct
  34 {
  35     const char  *dw;
  36     u_char      cn;
  37     u_char      fl;
  38 } dws[] =
  39 {
  40     { "su", 2, LTM_SUN }, { "mo", 2, LTM_MON }, { "tu", 2, LTM_TUE },
  41     { "we", 2, LTM_WED }, { "th", 2, LTM_THU }, { "fr", 2, LTM_FRI },
  42     { "sa", 2, LTM_SAT }, { "any",3, LTM_ANY }, { "all",3, LTM_ANY },
  43     { "wk", 2, LTM_WK  }, { "wd", 2, LTM_WD  }, { NULL, 0, 0       }
  44 };
  45
  46 static char *
  47 parse_time(char * ptr, u_short * t)
  48 {
  49     u_short     val;
  50
  51     for (val = 0; *ptr && isdigit(*ptr); ptr++)
  52         val = (u_short)(val * 10 + (*ptr - '0'));
  53
  54     *t = (u_short)((val / 100) * 60 + (val % 100));
  55
  56     return (ptr);
  57 }
  58
  59
  60 login_time_t
  61 parse_lt(const char *str)
  62 {
  63     login_time_t    t;
  64
  65     memset(&t, 0, sizeof t);
  66     t.lt_dow = LTM_NONE;
  67     if (str && *str && strcmp(str, "Never") != 0 && strcmp(str, "None") != 0) {
  68         int             i;
  69         login_time_t    m = t;
  70         char            *p;
  71         char            buf[64];
  72
  73         /* Make local copy and force lowercase to simplify parsing */
  74         strlcpy(buf, str, sizeof buf);
  75         for (i = 0; buf[i]; i++)
  76             buf[i] = (char)tolower(buf[i]);
  77         p = buf;
  78
  79         while (isalpha(*p)) {
  80
  81             i = 0;
  82             while (dws[i].dw && strncmp(p, dws[i].dw, dws[i].cn) != 0)
  83                 i++;
  84             if (dws[i].dw == NULL)
  85                 break;
  86             m.lt_dow |= dws[i].fl;
  87             p += dws[i].cn;
  88         }
  89
  90         if (m.lt_dow == LTM_NONE) /* No (valid) prefix, assume any */
  91             m.lt_dow |= LTM_ANY;
  92
  93         if (isdigit(*p))
  94             p = parse_time(p, &m.lt_start);
  95         else
  96             m.lt_start = 0;
  97         if (*p == '-')
  98             p = parse_time(p + 1, &m.lt_end);
  99         else
 100             m.lt_end = 1440;
 101
 102         t = m;
 103     }
 104     return (t);
 105 }
 106
 107
 108 int
 109 in_ltm(const login_time_t *ltm, struct tm *tt, time_t *ends)
 110 {
 111     int     rc = 0;
 112
 113     if (tt != NULL) {
 114         /* First, examine the day of the week */
 115         if ((u_char)(0x01 << tt->tm_wday) & ltm->lt_dow) {
 116             /* Convert `current' time to minute of the day */
 117             u_short     now = (u_short)((tt->tm_hour * 60) + tt->tm_min);
 118
 119             if (tt->tm_sec > 30)
 120                 ++now;
 121             if (now >= ltm->lt_start && now < ltm->lt_end) {
 122                 rc = 2;
 123                 if (ends != NULL) {
 124                     /* If requested, return ending time for this period */
 125                     tt->tm_hour = (int)(ltm->lt_end / 60);
 126                     tt->tm_min  = (int)(ltm->lt_end % 60);
 127                     *ends = mktime(tt);
 128                 }
 129             }
 130         }
 131     }
 132     return (rc);
 133 }
 134
 135
 136 int
 137 in_lt(const login_time_t *ltm, time_t *t)
 138 {
 139
 140     return (in_ltm(ltm, localtime(t), t));
 141 }
 142
 143 int
 144 in_ltms(const login_time_t *ltm, struct tm *tm, time_t *t)
 145 {
 146     int     i = 0;
 147
 148     while (i < LC_MAXTIMES && ltm[i].lt_dow != LTM_NONE) {
 149         if (in_ltm(ltm + i, tm, t))
 150             return (i);
 151         i++;
 152     }
 153     return (-1);
 154 }
 155
 156 int
 157 in_lts(const login_time_t *ltm, time_t *t)
 158 {
 159
 160     return (in_ltms(ltm, localtime(t), t));
 161 }