lib/rfc1123.c

   1 /*
   2  * $Id: rfc1123.c,v 1.2 1996/10/25 17:35:22 wessels Exp $
   3  *
   4  * DEBUG:
   5  * AUTHOR: Harvest Derived
   6  *
   7  * SQUID Internet Object Cache  http://www.nlanr.net/Squid/
   8  * --------------------------------------------------------
   9  *
  10  *  Squid is the result of efforts by numerous individuals from the
  11  *  Internet community.  Development is led by Duane Wessels of the
  12  *  National Laboratory for Applied Network Research and funded by
  13  *  the National Science Foundation.
  14  *
  15  *  This program is free software; you can redistribute it and/or modify
  16  *  it under the terms of the GNU General Public License as published by
  17  *  the Free Software Foundation; either version 2 of the License, or
  18  *  (at your option) any later version.
  19  *
  20  *  This program is distributed in the hope that it will be useful,
  21  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  *  GNU General Public License for more details.
  24  *
  25  *  You should have received a copy of the GNU General Public License
  26  *  along with this program; if not, write to the Free Software
  27  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  28  *
  29  */
  30
  31 /*
  32  * Copyright (c) 1994, 1995.  All rights reserved.
  33  *
  34  *   The Harvest software was developed by the Internet Research Task
  35  *   Force Research Group on Resource Discovery (IRTF-RD):
  36  *
  37  *         Mic Bowman of Transarc Corporation.
  38  *         Peter Danzig of the University of Southern California.
  39  *         Darren R. Hardy of the University of Colorado at Boulder.
  40  *         Udi Manber of the University of Arizona.
  41  *         Michael F. Schwartz of the University of Colorado at Boulder.
  42  *         Duane Wessels of the University of Colorado at Boulder.
  43  *
  44  *   This copyright notice applies to software in the Harvest
  45  *   ``src/'' directory only.  Users should consult the individual
  46  *   copyright notices in the ``components/'' subdirectories for
  47  *   copyright information about other software bundled with the
  48  *   Harvest source code distribution.
  49  *
  50  * TERMS OF USE
  51  *
  52  *   The Harvest software may be used and re-distributed without
  53  *   charge, provided that the software origin and research team are
  54  *   cited in any use of the system.  Most commonly this is
  55  *   accomplished by including a link to the Harvest Home Page
  56  *   (http://harvest.cs.colorado.edu/) from the query page of any
  57  *   Broker you deploy, as well as in the query result pages.  These
  58  *   links are generated automatically by the standard Broker
  59  *   software distribution.
  60  *
  61  *   The Harvest software is provided ``as is'', without express or
  62  *   implied warranty, and with no support nor obligation to assist
  63  *   in its use, correction, modification or enhancement.  We assume
  64  *   no liability with respect to the infringement of copyrights,
  65  *   trade secrets, or any patents, and are not responsible for
  66  *   consequential damages.  Proper use of the Harvest software is
  67  *   entirely the responsibility of the user.
  68  *
  69  * DERIVATIVE WORKS
  70  *
  71  *   Users may make derivative works from the Harvest software, subject
  72  *   to the following constraints:
  73  *
  74  *     - You must include the above copyright notice and these
  75  *       accompanying paragraphs in all forms of derivative works,
  76  *       and any documentation and other materials related to such
  77  *       distribution and use acknowledge that the software was
  78  *       developed at the above institutions.
  79  *
  80  *     - You must notify IRTF-RD regarding your distribution of
  81  *       the derivative work.
  82  *
  83  *     - You must clearly notify users that your are distributing
  84  *       a modified version and not the original Harvest software.
  85  *
  86  *     - Any derivative product is also subject to these copyright
  87  *       and use restrictions.
  88  *
  89  *   Note that the Harvest software is NOT in the public domain.  We
  90  *   retain copyright, as specified above.
  91  *
  92  * HISTORY OF FREE SOFTWARE STATUS
  93  *
  94  *   Originally we required sites to license the software in cases
  95  *   where they were going to build commercial products/services
  96  *   around Harvest.  In June 1995 we changed this policy.  We now
  97  *   allow people to use the core Harvest software (the code found in
  98  *   the Harvest ``src/'' directory) for free.  We made this change
  99  *   in the interest of encouraging the widest possible deployment of
 100  *   the technology.  The Harvest software is really a reference
 101  *   implementation of a set of protocols and formats, some of which
 102  *   we intend to standardize.  We encourage commercial
 103  *   re-implementations of code complying to this set of standards.
 104  */
 105
 106 #include "config.h"
 107
 108
 109 /*
 110  *  Adapted from HTSUtils.c in CERN httpd 3.0 (http://info.cern.ch/httpd/)
 111  *  by Darren Hardy <hardy@cs.colorado.edu>, November 1994.
 112  */
 113 #if HAVE_STDIO_H
 114 #include <stdio.h>
 115 #endif
 116 #if HAVE_STRING_H
 117 #include <string.h>
 118 #endif
 119 #if HAVE_CTYPE_H
 120 #include <ctype.h>
 121 #endif
 122 #if HAVE_SYS_TYPES_H
 123 #include <sys/types.h>
 124 #endif
 125 #if HAVE_TIME_H
 126 #include <time.h>
 127 #endif
 128 #if HAVE_SYS_TIME_H
 129 #include <sys/time.h>
 130 #endif
 131
 132 #include "ansiproto.h"
 133 #include "util.h"
 134
 135 #define RFC850_STRFTIME "%A, %d-%b-%y %H:%M:%S GMT"
 136 #define RFC1123_STRFTIME "%a, %d %b %Y %H:%M:%S GMT"
 137
 138 static int make_month _PARAMS((char *s));
 139 static int make_num _PARAMS((char *s));
 140
 141 static char *month_names[12] =
 142 {
 143     "Jan", "Feb", "Mar", "Apr", "May", "Jun",
 144     "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
 145 };
 146
 147
 148 static int
 149 make_num(char *s)
 150 {
 151     if (*s >= '0' && *s <= '9')
 152         return 10 * (*s - '0') + *(s + 1) - '0';
 153     else
 154         return *(s + 1) - '0';
 155 }
 156
 157 static int
 158 make_month(char *s)
 159 {
 160     int i;
 161
 162     *s = toupper(*s);
 163     *(s + 1) = tolower(*(s + 1));
 164     *(s + 2) = tolower(*(s + 2));
 165
 166     for (i = 0; i < 12; i++)
 167         if (!strncmp(month_names[i], s, 3))
 168             return i;
 169     return 0;
 170 }
 171
 172
 173 time_t
 174 parse_rfc1123(char *str)
 175 {
 176     char *s;
 177     struct tm tm;
 178     time_t t;
 179
 180     if (!str)
 181         return -1;
 182
 183     if ((s = strchr(str, ','))) {       /* Thursday, 10-Jun-93 01:29:59 GMT */
 184         s++;                    /* or: Thu, 10 Jan 1993 01:29:59 GMT */
 185         while (*s && *s == ' ')
 186             s++;
 187         if (strchr(s, '-')) {   /* First format */
 188             if ((int) strlen(s) < 18)
 189                 return -1;
 190             tm.tm_mday = make_num(s);
 191             tm.tm_mon = make_month(s + 3);
 192             tm.tm_year = make_num(s + 7);
 193             tm.tm_hour = make_num(s + 10);
 194             tm.tm_min = make_num(s + 13);
 195             tm.tm_sec = make_num(s + 16);
 196         } else {                /* Second format */
 197             if ((int) strlen(s) < 20)
 198                 return -1;
 199             tm.tm_mday = make_num(s);
 200             tm.tm_mon = make_month(s + 3);
 201             tm.tm_year = (100 * make_num(s + 7) - 1900) + make_num(s + 9);
 202             tm.tm_hour = make_num(s + 12);
 203             tm.tm_min = make_num(s + 15);
 204             tm.tm_sec = make_num(s + 18);
 205
 206         }
 207     } else {                    /* Try the other format:        */
 208         s = str;                /* Wed Jun  9 01:29:59 1993 GMT */
 209         while (*s && *s == ' ')
 210             s++;
 211         if ((int) strlen(s) < 24)
 212             return -1;
 213         tm.tm_mday = make_num(s + 8);
 214         tm.tm_mon = make_month(s + 4);
 215         tm.tm_year = make_num(s + 22);
 216         tm.tm_hour = make_num(s + 11);
 217         tm.tm_min = make_num(s + 14);
 218         tm.tm_sec = make_num(s + 17);
 219     }
 220     if (tm.tm_sec < 0 || tm.tm_sec > 59 ||
 221         tm.tm_min < 0 || tm.tm_min > 59 ||
 222         tm.tm_hour < 0 || tm.tm_hour > 23 ||
 223         tm.tm_mday < 1 || tm.tm_mday > 31 ||
 224         tm.tm_mon < 0 || tm.tm_mon > 11 ||
 225         tm.tm_year < 70 || tm.tm_year > 120) {
 226         return -1;
 227     }
 228     tm.tm_isdst = -1;
 229
 230 #ifdef HAVE_TIMEGM
 231     t = timegm(&tm);
 232 #elif HAVE_TM_GMTOFF
 233     t = mktime(&tm);
 234     {
 235         time_t cur_t = time(NULL);
 236         struct tm *local = localtime(&cur_t);
 237         t += local->tm_gmtoff;
 238     }
 239 #else
 240     /* some systems do not have tm_gmtoff so we fake it */
 241     t = mktime(&tm);
 242     {
 243         time_t dst = 0;
 244         extern time_t timezone;
 245         /*
 246          * The following assumes a fixed DST offset of 1 hour,
 247          * which is probably wrong.
 248          */
 249         if (tm.tm_isdst > 0)
 250             dst = -3600;
 251         t -= (timezone + dst);
 252     }
 253 #endif
 254     return t;
 255 }
 256
 257 char *
 258 mkrfc1123(time_t t)
 259 {
 260     static char buf[128];
 261
 262     struct tm *gmt = gmtime(&t);
 263
 264     buf[0] = '\0';
 265     strftime(buf, 127, RFC1123_STRFTIME, gmt);
 266     return buf;
 267 }
 268
 269 char *
 270 mkhttpdlogtime(time_t * t)
 271 {
 272     static char buf[128];
 273
 274     struct tm *gmt = gmtime(t);
 275
 276 #ifndef USE_GMT
 277     int gmt_min, gmt_hour, gmt_yday, day_offset;
 278     size_t len;
 279     struct tm *lt;
 280     int min_offset;
 281
 282     /* localtime & gmtime may use the same static data */
 283     gmt_min = gmt->tm_min;
 284     gmt_hour = gmt->tm_hour;
 285     gmt_yday = gmt->tm_yday;
 286
 287     lt = localtime(t);
 288     day_offset = lt->tm_yday - gmt_yday;
 289     min_offset = day_offset * 1440 + (lt->tm_hour - gmt_hour) * 60
 290         + (lt->tm_min - gmt_min);
 291
 292     /* wrap round on end of year */
 293     if (day_offset > 1)
 294         day_offset = -1;
 295     else if (day_offset < -1)
 296         day_offset = 1;
 297
 298     len = strftime(buf, 127 - 5, "%d/%b/%Y:%H:%M:%S ", lt);
 299     sprintf(buf + len, "%+03d%02d",
 300         (min_offset / 60) % 24,
 301         min_offset % 60);
 302 #else /* USE_GMT */
 303     buf[0] = '\0';
 304     strftime(buf, 127, "%d/%b/%Y:%H:%M:%S -000", gmt);
 305 #endif /* USE_GMT */
 306
 307     return buf;
 308 }
 309
 310 #if 0
 311 int
 312 main()
 313 {
 314     char *x;
 315     time_t t, pt;
 316
 317     t = time(NULL);
 318     x = mkrfc1123(t);
 319     printf("HTTP Time: %s\n", x);
 320
 321     pt = parse_rfc1123(x);
 322     printf("Parsed: %d vs. %d\n", pt, t);
 323 }
 324
 325 #endif