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dhcp 4.1 r7

    1: /*
    2:  * Copyright (c) 2004,2007,2009 by Internet Systems Consortium, Inc. ("ISC")
    3:  * Copyright (c) 1999-2003 by Internet Software Consortium
    4:  *
    5:  * Permission to use, copy, modify, and distribute this software for any
    6:  * purpose with or without fee is hereby granted, provided that the above
    7:  * copyright notice and this permission notice appear in all copies.
    8:  *
    9:  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
   10:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   11:  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
   12:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   13:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   14:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
   15:  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   16:  *
   17:  *   Internet Systems Consortium, Inc.
   18:  *   950 Charter Street
   19:  *   Redwood City, CA 94063
   20:  *   <info@isc.org>
   21:  *   https://www.isc.org/
   22:  */
   23: 
   24: #ifndef lint
   25: static const char rcsid[] = "$Id: ns_date.c,v 1.1.1.1 2012/10/09 09:06:54 misho Exp $";
   26: #endif
   27: 
   28: /* Import. */
   29: 
   30: #include <ctype.h>
   31: #include <errno.h>
   32: #include <stdio.h>
   33: #include <string.h>
   34: #include <time.h>
   35: 
   36: #include <sys/types.h>
   37: #include <netinet/in.h>
   38: #include <sys/socket.h>
   39: 
   40: #include "minires/minires.h"
   41: #include "arpa/nameser.h"
   42: 
   43: #ifdef SPRINTF_CHAR
   44: # define SPRINTF(x) strlen(sprintf/**/x)
   45: #else
   46: # define SPRINTF(x) ((size_t)sprintf x)
   47: #endif
   48: 
   49: /* Forward. */
   50: 
   51: static int	datepart(const char *, int, int, int, int *);
   52: 
   53: /* Public. */
   54: 
   55: /* Convert a date in ASCII into the number of seconds since
   56:    1 January 1970 (GMT assumed).  Format is yyyymmddhhmmss, all
   57:    digits required, no spaces allowed.  */
   58: 
   59: u_int32_t
   60: ns_datetosecs(const char *cp, int *errp) {
   61: 	struct tm time;
   62: 	u_int32_t result;
   63: 	int mdays, i;
   64: 	static const int days_per_month[12] =
   65: 		{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
   66: 
   67: 	if (strlen(cp) != 14) {
   68: 		*errp = 1;
   69: 		return (0);
   70: 	}
   71: 	*errp = 0;
   72: 
   73: 	memset(&time, 0, sizeof time);
   74: 	time.tm_year  = datepart(cp +  0, 4, 1990, 9999, errp) - 1900;
   75: 	time.tm_mon   = datepart(cp +  4, 2,   01,   12, errp) - 1;
   76: 	time.tm_mday  = datepart(cp +  6, 2,   01,   31, errp);
   77: 	time.tm_hour  = datepart(cp +  8, 2,   00,   23, errp);
   78: 	time.tm_min   = datepart(cp + 10, 2,   00,   59, errp);
   79: 	time.tm_sec   = datepart(cp + 12, 2,   00,   59, errp);
   80: 	if (*errp)		/* Any parse errors? */
   81: 		return (0);
   82: 
   83: 	/* 
   84: 	 * OK, now because timegm() is not available in all environments,
   85: 	 * we will do it by hand.  Roll up sleeves, curse the gods, begin!
   86: 	 */
   87: 
   88: #define SECS_PER_DAY    ((u_int32_t)24*60*60)
   89: #define isleap(y) ((((y) % 4) == 0 && ((y) % 100) != 0) || ((y) % 400) == 0)
   90: 
   91: 	result  = time.tm_sec;				/* Seconds */
   92: 	result += time.tm_min * 60;			/* Minutes */
   93: 	result += time.tm_hour * (60*60);		/* Hours */
   94: 	result += (time.tm_mday - 1) * SECS_PER_DAY;	/* Days */
   95: 
   96: 	/* Months are trickier.  Look without leaping, then leap */
   97: 	mdays = 0;
   98: 	for (i = 0; i < time.tm_mon; i++)
   99: 		mdays += days_per_month[i];
  100: 	result += mdays * SECS_PER_DAY;			/* Months */
  101: 	if (time.tm_mon > 1 && isleap(1900+time.tm_year))
  102: 		result += SECS_PER_DAY;		/* Add leapday for this year */
  103: 
  104: 	/* First figure years without leapdays, then add them in.  */
  105: 	/* The loop is slow, FIXME, but simple and accurate.  */
  106: 	result += (time.tm_year - 70) * (SECS_PER_DAY*365); /* Years */
  107: 	for (i = 70; i < time.tm_year; i++)
  108: 		if (isleap(1900+i))
  109: 			result += SECS_PER_DAY; /* Add leapday for prev year */
  110: 
  111: 	return (result);
  112: }
  113: 
  114: /* Private. */
  115: 
  116: /*
  117:  * Parse part of a date.  Set error flag if any error.
  118:  * Don't reset the flag if there is no error.
  119:  */
  120: static int
  121: datepart(const char *buf, int size, int min, int max, int *errp) {
  122: 	int result = 0;
  123: 	int i;
  124: 
  125: 	for (i = 0; i < size; i++) {
  126: 		if (!isdigit((unsigned char)buf[i]))
  127: 			*errp = 1;
  128: 		result = (result * 10) + buf[i] - '0';
  129: 	}
  130: 	if (result < min)
  131: 		*errp = 1;
  132: 	if (result > max)
  133: 		*errp = 1;
  134: 	return (result);
  135: }