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645 lines
18 KiB
C
645 lines
18 KiB
C
/***************************************************************************
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* _ _ ____ _
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* Project ___| | | | _ \| |
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* / __| | | | |_) | |
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* | (__| |_| | _ <| |___
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* \___|\___/|_| \_\_____|
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*
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* Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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*
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* This software is licensed as described in the file COPYING, which
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* you should have received as part of this distribution. The terms
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* are also available at https://curl.se/docs/copyright.html.
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*
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* You may opt to use, copy, modify, merge, publish, distribute and/or sell
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* copies of the Software, and permit persons to whom the Software is
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* furnished to do so, under the terms of the COPYING file.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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* SPDX-License-Identifier: curl
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*
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***************************************************************************/
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/*
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A brief summary of the date string formats this parser groks:
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RFC 2616 3.3.1
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Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123
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Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036
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Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format
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we support dates without week day name:
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06 Nov 1994 08:49:37 GMT
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06-Nov-94 08:49:37 GMT
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Nov 6 08:49:37 1994
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without the time zone:
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06 Nov 1994 08:49:37
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06-Nov-94 08:49:37
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weird order:
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1994 Nov 6 08:49:37 (GNU date fails)
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GMT 08:49:37 06-Nov-94 Sunday
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94 6 Nov 08:49:37 (GNU date fails)
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time left out:
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1994 Nov 6
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06-Nov-94
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Sun Nov 6 94
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unusual separators:
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1994.Nov.6
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Sun/Nov/6/94/GMT
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commonly used time zone names:
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Sun, 06 Nov 1994 08:49:37 CET
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06 Nov 1994 08:49:37 EST
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time zones specified using RFC822 style:
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Sun, 12 Sep 2004 15:05:58 -0700
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Sat, 11 Sep 2004 21:32:11 +0200
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compact numerical date strings:
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20040912 15:05:58 -0700
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20040911 +0200
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*/
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#include "curl_setup.h"
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#include <limits.h>
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#include <curl/curl.h>
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#include "strcase.h"
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#include "warnless.h"
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#include "parsedate.h"
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/*
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* parsedate()
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*
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* Returns:
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*
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* PARSEDATE_OK - a fine conversion
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* PARSEDATE_FAIL - failed to convert
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* PARSEDATE_LATER - time overflow at the far end of time_t
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* PARSEDATE_SOONER - time underflow at the low end of time_t
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*/
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static int parsedate(const char *date, time_t *output);
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#define PARSEDATE_OK 0
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#define PARSEDATE_FAIL -1
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#define PARSEDATE_LATER 1
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#define PARSEDATE_SOONER 2
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#if !defined(CURL_DISABLE_PARSEDATE) || !defined(CURL_DISABLE_FTP) || \
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!defined(CURL_DISABLE_FILE)
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/* These names are also used by FTP and FILE code */
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const char * const Curl_wkday[] =
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{"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
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const char * const Curl_month[]=
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{ "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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#endif
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#ifndef CURL_DISABLE_PARSEDATE
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static const char * const weekday[] =
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{ "Monday", "Tuesday", "Wednesday", "Thursday",
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"Friday", "Saturday", "Sunday" };
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struct tzinfo {
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char name[5];
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int offset; /* +/- in minutes */
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};
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/* Here's a bunch of frequently used time zone names. These were supported
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by the old getdate parser. */
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#define tDAYZONE -60 /* offset for daylight savings time */
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static const struct tzinfo tz[]= {
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{"GMT", 0}, /* Greenwich Mean */
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{"UT", 0}, /* Universal Time */
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{"UTC", 0}, /* Universal (Coordinated) */
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{"WET", 0}, /* Western European */
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{"BST", 0 tDAYZONE}, /* British Summer */
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{"WAT", 60}, /* West Africa */
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{"AST", 240}, /* Atlantic Standard */
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{"ADT", 240 tDAYZONE}, /* Atlantic Daylight */
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{"EST", 300}, /* Eastern Standard */
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{"EDT", 300 tDAYZONE}, /* Eastern Daylight */
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{"CST", 360}, /* Central Standard */
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{"CDT", 360 tDAYZONE}, /* Central Daylight */
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{"MST", 420}, /* Mountain Standard */
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{"MDT", 420 tDAYZONE}, /* Mountain Daylight */
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{"PST", 480}, /* Pacific Standard */
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{"PDT", 480 tDAYZONE}, /* Pacific Daylight */
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{"YST", 540}, /* Yukon Standard */
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{"YDT", 540 tDAYZONE}, /* Yukon Daylight */
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{"HST", 600}, /* Hawaii Standard */
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{"HDT", 600 tDAYZONE}, /* Hawaii Daylight */
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{"CAT", 600}, /* Central Alaska */
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{"AHST", 600}, /* Alaska-Hawaii Standard */
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{"NT", 660}, /* Nome */
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{"IDLW", 720}, /* International Date Line West */
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{"CET", -60}, /* Central European */
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{"MET", -60}, /* Middle European */
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{"MEWT", -60}, /* Middle European Winter */
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{"MEST", -60 tDAYZONE}, /* Middle European Summer */
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{"CEST", -60 tDAYZONE}, /* Central European Summer */
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{"MESZ", -60 tDAYZONE}, /* Middle European Summer */
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{"FWT", -60}, /* French Winter */
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{"FST", -60 tDAYZONE}, /* French Summer */
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{"EET", -120}, /* Eastern Europe, USSR Zone 1 */
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{"WAST", -420}, /* West Australian Standard */
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{"WADT", -420 tDAYZONE}, /* West Australian Daylight */
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{"CCT", -480}, /* China Coast, USSR Zone 7 */
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{"JST", -540}, /* Japan Standard, USSR Zone 8 */
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{"EAST", -600}, /* Eastern Australian Standard */
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{"EADT", -600 tDAYZONE}, /* Eastern Australian Daylight */
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{"GST", -600}, /* Guam Standard, USSR Zone 9 */
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{"NZT", -720}, /* New Zealand */
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{"NZST", -720}, /* New Zealand Standard */
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{"NZDT", -720 tDAYZONE}, /* New Zealand Daylight */
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{"IDLE", -720}, /* International Date Line East */
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/* Next up: Military timezone names. RFC822 allowed these, but (as noted in
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RFC 1123) had their signs wrong. Here we use the correct signs to match
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actual military usage.
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*/
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{"A", 1 * 60}, /* Alpha */
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{"B", 2 * 60}, /* Bravo */
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{"C", 3 * 60}, /* Charlie */
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{"D", 4 * 60}, /* Delta */
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{"E", 5 * 60}, /* Echo */
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{"F", 6 * 60}, /* Foxtrot */
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{"G", 7 * 60}, /* Golf */
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{"H", 8 * 60}, /* Hotel */
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{"I", 9 * 60}, /* India */
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/* "J", Juliet is not used as a timezone, to indicate the observer's local
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time */
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{"K", 10 * 60}, /* Kilo */
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{"L", 11 * 60}, /* Lima */
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{"M", 12 * 60}, /* Mike */
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{"N", -1 * 60}, /* November */
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{"O", -2 * 60}, /* Oscar */
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{"P", -3 * 60}, /* Papa */
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{"Q", -4 * 60}, /* Quebec */
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{"R", -5 * 60}, /* Romeo */
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{"S", -6 * 60}, /* Sierra */
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{"T", -7 * 60}, /* Tango */
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{"U", -8 * 60}, /* Uniform */
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{"V", -9 * 60}, /* Victor */
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{"W", -10 * 60}, /* Whiskey */
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{"X", -11 * 60}, /* X-ray */
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{"Y", -12 * 60}, /* Yankee */
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{"Z", 0}, /* Zulu, zero meridian, a.k.a. UTC */
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};
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/* returns:
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-1 no day
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0 monday - 6 sunday
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*/
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static int checkday(const char *check, size_t len)
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{
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int i;
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const char * const *what;
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if(len > 3)
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what = &weekday[0];
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else if(len == 3)
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what = &Curl_wkday[0];
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else
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return -1; /* too short */
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for(i = 0; i < 7; i++) {
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size_t ilen = strlen(what[0]);
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if((ilen == len) &&
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strncasecompare(check, what[0], len))
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return i;
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what++;
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}
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return -1;
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}
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static int checkmonth(const char *check, size_t len)
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{
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int i;
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const char * const *what = &Curl_month[0];
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if(len != 3)
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return -1; /* not a month */
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for(i = 0; i < 12; i++) {
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if(strncasecompare(check, what[0], 3))
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return i;
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what++;
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}
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return -1; /* return the offset or -1, no real offset is -1 */
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}
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/* return the time zone offset between GMT and the input one, in number
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of seconds or -1 if the timezone was not found/legal */
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static int checktz(const char *check, size_t len)
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{
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unsigned int i;
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const struct tzinfo *what = tz;
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if(len > 4) /* longer than any valid timezone */
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return -1;
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for(i = 0; i < sizeof(tz)/sizeof(tz[0]); i++) {
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size_t ilen = strlen(what->name);
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if((ilen == len) &&
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strncasecompare(check, what->name, len))
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return what->offset*60;
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what++;
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}
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return -1;
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}
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static void skip(const char **date)
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{
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/* skip everything that are not letters or digits */
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while(**date && !ISALNUM(**date))
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(*date)++;
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}
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enum assume {
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DATE_MDAY,
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DATE_YEAR,
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DATE_TIME
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};
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/*
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* time2epoch: time stamp to seconds since epoch in GMT time zone. Similar to
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* mktime but for GMT only.
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*/
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static time_t time2epoch(int sec, int min, int hour,
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int mday, int mon, int year)
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{
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static const int month_days_cumulative [12] =
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{ 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 };
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int leap_days = year - (mon <= 1);
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leap_days = ((leap_days / 4) - (leap_days / 100) + (leap_days / 400)
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- (1969 / 4) + (1969 / 100) - (1969 / 400));
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return ((((time_t) (year - 1970) * 365
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+ leap_days + month_days_cumulative[mon] + mday - 1) * 24
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+ hour) * 60 + min) * 60 + sec;
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}
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/* Returns the value of a single-digit or two-digit decimal number, return
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then pointer to after the number. The 'date' pointer is known to point to a
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digit. */
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static int oneortwodigit(const char *date, const char **endp)
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{
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int num = date[0] - '0';
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if(ISDIGIT(date[1])) {
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*endp = &date[2];
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return num*10 + (date[1] - '0');
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}
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*endp = &date[1];
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return num;
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}
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/* HH:MM:SS or HH:MM and accept single-digits too */
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static bool match_time(const char *date,
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int *h, int *m, int *s, char **endp)
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{
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const char *p;
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int hh, mm, ss = 0;
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hh = oneortwodigit(date, &p);
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if((hh < 24) && (*p == ':') && ISDIGIT(p[1])) {
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mm = oneortwodigit(&p[1], &p);
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if(mm < 60) {
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if((*p == ':') && ISDIGIT(p[1])) {
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ss = oneortwodigit(&p[1], &p);
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if(ss <= 60) {
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/* valid HH:MM:SS */
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goto match;
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}
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}
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else {
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/* valid HH:MM */
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goto match;
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}
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}
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}
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return FALSE; /* not a time string */
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match:
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*h = hh;
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*m = mm;
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*s = ss;
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*endp = (char *)p;
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return TRUE;
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}
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/*
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* parsedate()
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*
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* Returns:
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*
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* PARSEDATE_OK - a fine conversion
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* PARSEDATE_FAIL - failed to convert
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* PARSEDATE_LATER - time overflow at the far end of time_t
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* PARSEDATE_SOONER - time underflow at the low end of time_t
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*/
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/* Wednesday is the longest name this parser knows about */
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#define NAME_LEN 12
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static int parsedate(const char *date, time_t *output)
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{
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time_t t = 0;
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int wdaynum = -1; /* day of the week number, 0-6 (mon-sun) */
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int monnum = -1; /* month of the year number, 0-11 */
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int mdaynum = -1; /* day of month, 1 - 31 */
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int hournum = -1;
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int minnum = -1;
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int secnum = -1;
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int yearnum = -1;
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int tzoff = -1;
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enum assume dignext = DATE_MDAY;
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const char *indate = date; /* save the original pointer */
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int part = 0; /* max 6 parts */
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while(*date && (part < 6)) {
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bool found = FALSE;
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skip(&date);
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if(ISALPHA(*date)) {
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/* a name coming up */
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size_t len = 0;
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const char *p = date;
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while(ISALPHA(*p) && (len < NAME_LEN)) {
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p++;
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len++;
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}
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if(len != NAME_LEN) {
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if(wdaynum == -1) {
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wdaynum = checkday(date, len);
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if(wdaynum != -1)
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found = TRUE;
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}
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if(!found && (monnum == -1)) {
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monnum = checkmonth(date, len);
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if(monnum != -1)
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found = TRUE;
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}
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if(!found && (tzoff == -1)) {
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/* this just must be a time zone string */
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tzoff = checktz(date, len);
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if(tzoff != -1)
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found = TRUE;
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}
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}
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if(!found)
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return PARSEDATE_FAIL; /* bad string */
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date += len;
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}
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else if(ISDIGIT(*date)) {
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/* a digit */
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int val;
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char *end;
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if((secnum == -1) &&
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match_time(date, &hournum, &minnum, &secnum, &end)) {
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/* time stamp */
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date = end;
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}
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else {
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long lval;
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int error;
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int old_errno;
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old_errno = errno;
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errno = 0;
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lval = strtol(date, &end, 10);
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error = errno;
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if(errno != old_errno)
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errno = old_errno;
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if(error)
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return PARSEDATE_FAIL;
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#if LONG_MAX != INT_MAX
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if((lval > (long)INT_MAX) || (lval < (long)INT_MIN))
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return PARSEDATE_FAIL;
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#endif
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val = curlx_sltosi(lval);
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if((tzoff == -1) &&
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((end - date) == 4) &&
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(val <= 1400) &&
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(indate < date) &&
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((date[-1] == '+' || date[-1] == '-'))) {
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/* four digits and a value less than or equal to 1400 (to take into
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account all sorts of funny time zone diffs) and it is preceded
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with a plus or minus. This is a time zone indication. 1400 is
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picked since +1300 is frequently used and +1400 is mentioned as
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an edge number in the document "ISO C 200X Proposal: Timezone
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Functions" at http://david.tribble.com/text/c0xtimezone.html If
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anyone has a more authoritative source for the exact maximum time
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zone offsets, please speak up! */
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found = TRUE;
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tzoff = (val/100 * 60 + val%100)*60;
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/* the + and - prefix indicates the local time compared to GMT,
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this we need their reversed math to get what we want */
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tzoff = date[-1]=='+' ? -tzoff : tzoff;
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}
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if(((end - date) == 8) &&
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(yearnum == -1) &&
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(monnum == -1) &&
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(mdaynum == -1)) {
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/* 8 digits, no year, month or day yet. This is YYYYMMDD */
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found = TRUE;
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yearnum = val/10000;
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monnum = (val%10000)/100-1; /* month is 0 - 11 */
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mdaynum = val%100;
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}
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if(!found && (dignext == DATE_MDAY) && (mdaynum == -1)) {
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if((val > 0) && (val < 32)) {
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mdaynum = val;
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found = TRUE;
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}
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dignext = DATE_YEAR;
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}
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if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) {
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yearnum = val;
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found = TRUE;
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if(yearnum < 100) {
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if(yearnum > 70)
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yearnum += 1900;
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else
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yearnum += 2000;
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}
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if(mdaynum == -1)
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dignext = DATE_MDAY;
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}
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if(!found)
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return PARSEDATE_FAIL;
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date = end;
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}
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}
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part++;
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}
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if(-1 == secnum)
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secnum = minnum = hournum = 0; /* no time, make it zero */
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if((-1 == mdaynum) ||
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(-1 == monnum) ||
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(-1 == yearnum))
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/* lacks vital info, fail */
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return PARSEDATE_FAIL;
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#ifdef HAVE_TIME_T_UNSIGNED
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if(yearnum < 1970) {
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/* only positive numbers cannot return earlier */
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*output = TIME_T_MIN;
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return PARSEDATE_SOONER;
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}
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#endif
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#if (SIZEOF_TIME_T < 5)
|
|
|
|
#ifdef HAVE_TIME_T_UNSIGNED
|
|
/* an unsigned 32-bit time_t can only hold dates to 2106 */
|
|
if(yearnum > 2105) {
|
|
*output = TIME_T_MAX;
|
|
return PARSEDATE_LATER;
|
|
}
|
|
#else
|
|
/* a signed 32-bit time_t can only hold dates to the beginning of 2038 */
|
|
if(yearnum > 2037) {
|
|
*output = TIME_T_MAX;
|
|
return PARSEDATE_LATER;
|
|
}
|
|
if(yearnum < 1903) {
|
|
*output = TIME_T_MIN;
|
|
return PARSEDATE_SOONER;
|
|
}
|
|
#endif
|
|
|
|
#else
|
|
/* The Gregorian calendar was introduced 1582 */
|
|
if(yearnum < 1583)
|
|
return PARSEDATE_FAIL;
|
|
#endif
|
|
|
|
if((mdaynum > 31) || (monnum > 11) ||
|
|
(hournum > 23) || (minnum > 59) || (secnum > 60))
|
|
return PARSEDATE_FAIL; /* clearly an illegal date */
|
|
|
|
/* time2epoch() returns a time_t. time_t is often 32 bits, sometimes even on
|
|
architectures that feature a 64 bits 'long' but ultimately time_t is the
|
|
correct data type to use.
|
|
*/
|
|
t = time2epoch(secnum, minnum, hournum, mdaynum, monnum, yearnum);
|
|
|
|
/* Add the time zone diff between local time zone and GMT. */
|
|
if(tzoff == -1)
|
|
tzoff = 0;
|
|
|
|
if((tzoff > 0) && (t > TIME_T_MAX - tzoff)) {
|
|
*output = TIME_T_MAX;
|
|
return PARSEDATE_LATER; /* time_t overflow */
|
|
}
|
|
|
|
t += tzoff;
|
|
|
|
*output = t;
|
|
|
|
return PARSEDATE_OK;
|
|
}
|
|
#else
|
|
/* disabled */
|
|
static int parsedate(const char *date, time_t *output)
|
|
{
|
|
(void)date;
|
|
*output = 0;
|
|
return PARSEDATE_OK; /* a lie */
|
|
}
|
|
#endif
|
|
|
|
time_t curl_getdate(const char *p, const time_t *now)
|
|
{
|
|
time_t parsed = -1;
|
|
int rc = parsedate(p, &parsed);
|
|
(void)now; /* legacy argument from the past that we ignore */
|
|
|
|
if(rc == PARSEDATE_OK) {
|
|
if(parsed == -1)
|
|
/* avoid returning -1 for a working scenario */
|
|
parsed++;
|
|
return parsed;
|
|
}
|
|
/* everything else is fail */
|
|
return -1;
|
|
}
|
|
|
|
/* Curl_getdate_capped() differs from curl_getdate() in that this will return
|
|
TIME_T_MAX in case the parsed time value was too big, instead of an
|
|
error. */
|
|
|
|
time_t Curl_getdate_capped(const char *p)
|
|
{
|
|
time_t parsed = -1;
|
|
int rc = parsedate(p, &parsed);
|
|
|
|
switch(rc) {
|
|
case PARSEDATE_OK:
|
|
if(parsed == -1)
|
|
/* avoid returning -1 for a working scenario */
|
|
parsed++;
|
|
return parsed;
|
|
case PARSEDATE_LATER:
|
|
/* this returns the maximum time value */
|
|
return parsed;
|
|
default:
|
|
return -1; /* everything else is fail */
|
|
}
|
|
/* UNREACHABLE */
|
|
}
|
|
|
|
/*
|
|
* Curl_gmtime() is a gmtime() replacement for portability. Do not use the
|
|
* gmtime_r() or gmtime() functions anywhere else but here.
|
|
*
|
|
*/
|
|
|
|
CURLcode Curl_gmtime(time_t intime, struct tm *store)
|
|
{
|
|
const struct tm *tm;
|
|
#ifdef HAVE_GMTIME_R
|
|
/* thread-safe version */
|
|
tm = (struct tm *)gmtime_r(&intime, store);
|
|
#else
|
|
/* !checksrc! disable BANNEDFUNC 1 */
|
|
tm = gmtime(&intime);
|
|
if(tm)
|
|
*store = *tm; /* copy the pointed struct to the local copy */
|
|
#endif
|
|
|
|
if(!tm)
|
|
return CURLE_BAD_FUNCTION_ARGUMENT;
|
|
return CURLE_OK;
|
|
}
|