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/*
* $Id: rfc1123.c,v 1.34 2006/05/22 18:55:23 serassio Exp $
*
* DEBUG:
* AUTHOR: Harvest Derived
*
* SQUID Web Proxy Cache http://www.squid-cache.org/
* ----------------------------------------------------------
*
* Squid is the result of efforts by numerous individuals from
* the Internet community; see the CONTRIBUTORS file for full
* details. Many organizations have provided support for Squid's
* development; see the SPONSORS file for full details. Squid is
* Copyrighted (C) 2001 by the Regents of the University of
* California; see the COPYRIGHT file for full details. Squid
* incorporates software developed and/or copyrighted by other
* sources; see the CREDITS file for full details.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
*
*/
#include "config.h"
/*
* Adapted from HTSUtils.c in CERN httpd 3.0 (http://info.cern.ch/httpd/)
* by Darren Hardy <hardy@cs.colorado.edu>, November 1994.
*/
#if HAVE_STDIO_H
#include <stdio.h>
#endif
#if HAVE_STDLIB_H
#include <stdlib.h>
#endif
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_CTYPE_H
#include <ctype.h>
#endif
#if HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#if HAVE_TIME_H
#include <time.h>
#endif
#if HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include "assert.h"
#include "util.h"
#include "snprintf.h"
#define RFC850_STRFTIME "%A, %d-%b-%y %H:%M:%S GMT"
#define RFC1123_STRFTIME "%a, %d %b %Y %H:%M:%S GMT"
static const char *const w_space = " \t\r\n";
static int make_month(const char *s);
static int make_num(const char *s);
static const char *month_names[12] =
{
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
static int
make_num(const char *s)
{
if (*s >= '0' && *s <= '9')
return 10 * (*s - '0') + *(s + 1) - '0';
else
return *(s + 1) - '0';
}
static int
make_month(const char *s)
{
int i;
char month[3];
month[0] = xtoupper(*s);
month[1] = xtolower(*(s + 1));
month[2] = xtolower(*(s + 2));
for (i = 0; i < 12; i++)
if (!strncmp(month_names[i], month, 3))
return i;
return -1;
}
static int
tmSaneValues(struct tm *tm)
{
if (tm->tm_sec < 0 || tm->tm_sec > 59)
return 0;
if (tm->tm_min < 0 || tm->tm_min > 59)
return 0;
if (tm->tm_hour < 0 || tm->tm_hour > 23)
return 0;
if (tm->tm_mday < 1 || tm->tm_mday > 31)
return 0;
if (tm->tm_mon < 0 || tm->tm_mon > 11)
return 0;
if (tm->tm_year < 70 || tm->tm_year > 120)
return 0;
return 1;
}
static struct tm *
parse_date_elements(const char *day, const char *month, const char *year,
const char *time, const char *zone)
{
static struct tm tm;
char *t;
memset(&tm, 0, sizeof(tm));
if (!day || !month || !year || !time)
return NULL;
tm.tm_mday = atoi(day);
tm.tm_mon = make_month(month);
if (tm.tm_mon < 0)
return NULL;
tm.tm_year = atoi(year);
if (strlen(year) == 4)
tm.tm_year -= 1900;
else if (tm.tm_year < 70)
tm.tm_year += 100;
else if (tm.tm_year > 19000)
tm.tm_year -= 19000;
tm.tm_hour = make_num(time);
t = strchr(time, ':');
if (!t)
return NULL;
t++;
tm.tm_min = atoi(t);
t = strchr(t, ':');
if (t)
tm.tm_sec = atoi(t + 1);
return tmSaneValues(&tm) ? &tm : NULL;
}
static struct tm *
parse_date(const char *str)
{
struct tm *tm;
char *tmp = xstrdup(str);
char *t;
char *wday = NULL;
char *day = NULL;
char *month = NULL;
char *year = NULL;
char *time = NULL;
char *zone = NULL;
for (t = strtok(tmp, ", "); t; t = strtok(NULL, ", ")) {
if (xisdigit(*t)) {
if (!day) {
day = t;
t = strchr(t, '-');
if (t) {
*t++ = '\0';
month = t;
t = strchr(t, '-');
if (!t)
return NULL;
*t++ = '\0';
year = t;
}
} else if (strchr(t, ':'))
time = t;
else if (!year)
year = t;
} else if (!wday)
wday = t;
else if (!month)
month = t;
else if (!zone)
zone = t;
}
tm = parse_date_elements(day, month, year, time, zone);
xfree(tmp);
return tm;
}
time_t
parse_rfc1123(const char *str)
{
struct tm *tm;
time_t t;
if (NULL == str)
return -1;
tm = parse_date(str);
if (!tm)
return -1;
tm->tm_isdst = -1;
#ifdef HAVE_TIMEGM
t = timegm(tm);
#elif HAVE_TM_GMTOFF
t = mktime(tm);
{
struct tm *local = localtime(&t);
t += local->tm_gmtoff;
}
#else
/* some systems do not have tm_gmtoff so we fake it */
t = mktime(tm);
{
time_t dst = 0;
#if defined (_TIMEZONE)
#elif defined (_timezone)
#elif defined(_SQUID_AIX_)
#elif defined(_SQUID_CYGWIN_)
#elif defined(_SQUID_MSWIN_)
#elif defined(_SQUID_SGI_)
#else
extern long timezone;
#endif
/*
* The following assumes a fixed DST offset of 1 hour,
* which is probably wrong.
*/
if (tm->tm_isdst > 0)
dst = -3600;
#if defined ( _timezone) || defined(_SQUID_WIN32_)
t -= (_timezone + dst);
#else
t -= (timezone + dst);
#endif
}
#endif
return t;
}
const char *
mkrfc1123(time_t t)
{
static char buf[128];
struct tm *gmt = gmtime(&t);
buf[0] = '\0';
strftime(buf, 127, RFC1123_STRFTIME, gmt);
return buf;
}
const char *
mkhttpdlogtime(const time_t * t)
{
static char buf[128];
struct tm *gmt = gmtime(t);
#ifndef USE_GMT
int gmt_min, gmt_hour, gmt_yday, day_offset;
size_t len;
struct tm *lt;
int min_offset;
/* localtime & gmtime may use the same static data */
gmt_min = gmt->tm_min;
gmt_hour = gmt->tm_hour;
gmt_yday = gmt->tm_yday;
lt = localtime(t);
day_offset = lt->tm_yday - gmt_yday;
/* wrap round on end of year */
if (day_offset > 1)
day_offset = -1;
else if (day_offset < -1)
day_offset = 1;
min_offset = day_offset * 1440 + (lt->tm_hour - gmt_hour) * 60
+ (lt->tm_min - gmt_min);
len = strftime(buf, 127 - 5, "%d/%b/%Y:%H:%M:%S ", lt);
snprintf(buf + len, 128 - len, "%+03d%02d",
(min_offset / 60) % 24,
min_offset % 60);
#else /* USE_GMT */
buf[0] = '\0';
strftime(buf, 127, "%d/%b/%Y:%H:%M:%S -000", gmt);
#endif /* USE_GMT */
return buf;
}
#if 0
int
main()
{
char *x;
time_t t, pt;
t = time(NULL);
x = mkrfc1123(t);
printf("HTTP Time: %s\n", x);
pt = parse_rfc1123(x);
printf("Parsed: %d vs. %d\n", pt, t);
}
#endif
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