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
  24 #include <sys/cdefs.h>
  25 __FBSDID("$FreeBSD$");
  26
  27 #include <sys/types.h>
  28 #include <ctype.h>
  29 #include <login_cap.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32 #include <time.h>
  33
  34 static struct
  35 {
  36     const char  *dw;
  37     u_char      cn;
  38     u_char      fl;
  39 } dws[] =
  40 {
  41     { "su", 2, LTM_SUN }, { "mo", 2, LTM_MON }, { "tu", 2, LTM_TUE },
  42     { "we", 2, LTM_WED }, { "th", 2, LTM_THU }, { "fr", 2, LTM_FRI },
  43     { "sa", 2, LTM_SAT }, { "any",3, LTM_ANY }, { "all",3, LTM_ANY },
  44     { "wk", 2, LTM_WK  }, { "wd", 2, LTM_WD  }, { NULL, 0, 0       }
  45 };
  46
  47 static char *
  48 parse_time(char * ptr, u_short * t)
  49 {
  50     u_short     val;
  51
  52     for (val = 0; *ptr && isdigit(*ptr); ptr++)
  53         val = (u_short)(val * 10 + (*ptr - '0'));
  54
  55     *t = (u_short)((val / 100) * 60 + (val % 100));
  56
  57     return ptr;
  58 }
  59
  60
  61 login_time_t
  62 parse_lt(const char * str)
  63 {
  64     login_time_t    t;
  65
  66     memset(&t, 0, sizeof t);
  67     t.lt_dow = LTM_NONE;
  68     if (str && *str && strcmp(str, "Never") != 0 && strcmp(str, "None") != 0) {
  69         int             i;
  70         login_time_t    m = t;
  71         char            *p;
  72         char            buf[64];
  73
  74         /* Make local copy and force lowercase to simplify parsing */
  75         p = strncpy(buf, str, sizeof buf);
  76         buf[sizeof buf - 1] = '\0';
  77         for (i = 0; buf[i]; i++)
  78             buf[i] = (char)tolower(buf[i]);
  79
  80         while (isalpha(*p)) {
  81
  82             i = 0;
  83             while (dws[i].dw && strncmp(p, dws[i].dw, dws[i].cn) != 0)
  84                 i++;
  85             if (dws[i].dw == NULL)
  86                 break;
  87             m.lt_dow |= dws[i].fl;
  88             p += dws[i].cn;
  89         }
  90
  91         if (m.lt_dow == LTM_NONE) /* No (valid) prefix, assume any */
  92             m.lt_dow |= LTM_ANY;
  93
  94         if (isdigit(*p))
  95             p = parse_time(p, &m.lt_start);
  96         else
  97             m.lt_start = 0;
  98         if (*p == '-')
  99             p = parse_time(++p, &m.lt_end);
 100         else
 101             m.lt_end = 1440;
 102
 103         t = m;
 104     }
 105     return t;
 106 }
 107
 108
 109 int
 110 in_ltm(const login_time_t * ltm, struct tm * tt, time_t * ends)
 111 {
 112     int     rc = 0;
 113
 114     if (tt != NULL) {
 115         /* First, examine the day of the week */
 116         if ((u_char)(0x01 << tt->tm_wday) & ltm->lt_dow) {
 117             /* Convert `current' time to minute of the day */
 118             u_short     now = (u_short)((tt->tm_hour * 60) + tt->tm_min);
 119
 120             if (tt->tm_sec > 30)
 121                 ++now;
 122             if (now >= ltm->lt_start && now < ltm->lt_end) {
 123                 rc = 2;
 124                 if (ends != NULL) {
 125                     /* If requested, return ending time for this period */
 126                     tt->tm_hour = (int)(ltm->lt_end / 60);
 127                     tt->tm_min  = (int)(ltm->lt_end % 60);
 128                     *ends = mktime(tt);
 129                 }
 130             }
 131         }
 132     }
 133     return rc;
 134 }
 135
 136
 137 int
 138 in_lt(const login_time_t * ltm, time_t * t)
 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     return in_ltms(ltm, localtime(t), t);
 160 }
 161