/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2006, Daniel Stenberg, <daniel@haxx.se>, et al. * * This software is licensed as described in the file COPYING, which * you should have received as part of this distribution. The terms * are also available at http://curl.haxx.se/docs/copyright.html. * * You may opt to use, copy, modify, merge, publish, distribute and/or sell * copies of the Software, and permit persons to whom the Software is * furnished to do so, under the terms of the COPYING file. * * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY * KIND, either express or implied. * * $Id: parsedate.c,v 1.23 2006-12-05 14:57:43 bagder Exp $ ***************************************************************************/ /* A brief summary of the date string formats this parser groks: RFC 2616 3.3.1 Sun, 06 Nov 1994 08:49:37 GMT ; RFC 822, updated by RFC 1123 Sunday, 06-Nov-94 08:49:37 GMT ; RFC 850, obsoleted by RFC 1036 Sun Nov 6 08:49:37 1994 ; ANSI C's asctime() format we support dates without week day name: 06 Nov 1994 08:49:37 GMT 06-Nov-94 08:49:37 GMT Nov 6 08:49:37 1994 without the time zone: 06 Nov 1994 08:49:37 06-Nov-94 08:49:37 weird order: 1994 Nov 6 08:49:37 (GNU date fails) GMT 08:49:37 06-Nov-94 Sunday 94 6 Nov 08:49:37 (GNU date fails) time left out: 1994 Nov 6 06-Nov-94 Sun Nov 6 94 unusual separators: 1994.Nov.6 Sun/Nov/6/94/GMT commonly used time zone names: Sun, 06 Nov 1994 08:49:37 CET 06 Nov 1994 08:49:37 EST time zones specified using RFC822 style: Sun, 12 Sep 2004 15:05:58 -0700 Sat, 11 Sep 2004 21:32:11 +0200 compact numerical date strings: 20040912 15:05:58 -0700 20040911 +0200 */ #include "setup.h" #include <stdio.h> #include <ctype.h> #include <string.h> #ifdef HAVE_STDLIB_H #include <stdlib.h> /* for strtol() */ #endif #include <curl/curl.h> static time_t Curl_parsedate(const char *date); const char * const Curl_wkday[] = {"Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"}; static const char * const weekday[] = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday" }; const char * const Curl_month[]= { "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" }; struct tzinfo { const char *name; int offset; /* +/- in minutes */ }; /* Here's a bunch of frequently used time zone names. These were supported by the old getdate parser. */ #define tDAYZONE -60 /* offset for daylight savings time */ static const struct tzinfo tz[]= { {"GMT", 0}, /* Greenwich Mean */ {"UTC", 0}, /* Universal (Coordinated) */ {"WET", 0}, /* Western European */ {"BST", 0 tDAYZONE}, /* British Summer */ {"WAT", 60}, /* West Africa */ {"AST", 240}, /* Atlantic Standard */ {"ADT", 240 tDAYZONE}, /* Atlantic Daylight */ {"EST", 300}, /* Eastern Standard */ {"EDT", 300 tDAYZONE}, /* Eastern Daylight */ {"CST", 360}, /* Central Standard */ {"CDT", 360 tDAYZONE}, /* Central Daylight */ {"MST", 420}, /* Mountain Standard */ {"MDT", 420 tDAYZONE}, /* Mountain Daylight */ {"PST", 480}, /* Pacific Standard */ {"PDT", 480 tDAYZONE}, /* Pacific Daylight */ {"YST", 540}, /* Yukon Standard */ {"YDT", 540 tDAYZONE}, /* Yukon Daylight */ {"HST", 600}, /* Hawaii Standard */ {"HDT", 600 tDAYZONE}, /* Hawaii Daylight */ {"CAT", 600}, /* Central Alaska */ {"AHST", 600}, /* Alaska-Hawaii Standard */ {"NT", 660}, /* Nome */ {"IDLW", 720}, /* International Date Line West */ {"CET", -60}, /* Central European */ {"MET", -60}, /* Middle European */ {"MEWT", -60}, /* Middle European Winter */ {"MEST", -60 tDAYZONE}, /* Middle European Summer */ {"CEST", -60 tDAYZONE}, /* Central European Summer */ {"MESZ", -60 tDAYZONE}, /* Middle European Summer */ {"FWT", -60}, /* French Winter */ {"FST", -60 tDAYZONE}, /* French Summer */ {"EET", -120}, /* Eastern Europe, USSR Zone 1 */ {"WAST", -420}, /* West Australian Standard */ {"WADT", -420 tDAYZONE}, /* West Australian Daylight */ {"CCT", -480}, /* China Coast, USSR Zone 7 */ {"JST", -540}, /* Japan Standard, USSR Zone 8 */ {"EAST", -600}, /* Eastern Australian Standard */ {"EADT", -600 tDAYZONE}, /* Eastern Australian Daylight */ {"GST", -600}, /* Guam Standard, USSR Zone 9 */ {"NZT", -720}, /* New Zealand */ {"NZST", -720}, /* New Zealand Standard */ {"NZDT", -720 tDAYZONE}, /* New Zealand Daylight */ {"IDLE", -720}, /* International Date Line East */ }; /* returns: -1 no day 0 monday - 6 sunday */ static int checkday(char *check, size_t len) { int i; const char * const *what; bool found= FALSE; if(len > 3) what = &weekday[0]; else what = &Curl_wkday[0]; for(i=0; i<7; i++) { if(curl_strequal(check, what[0])) { found=TRUE; break; } what++; } return found?i:-1; } static int checkmonth(char *check) { int i; const char * const *what; bool found= FALSE; what = &Curl_month[0]; for(i=0; i<12; i++) { if(curl_strequal(check, what[0])) { found=TRUE; break; } what++; } return found?i:-1; /* return the offset or -1, no real offset is -1 */ } /* return the time zone offset between GMT and the input one, in number of seconds or -1 if the timezone wasn't found/legal */ static int checktz(char *check) { unsigned int i; const struct tzinfo *what; bool found= FALSE; what = tz; for(i=0; i< sizeof(tz)/sizeof(tz[0]); i++) { if(curl_strequal(check, what->name)) { found=TRUE; break; } what++; } return found?what->offset*60:-1; } static void skip(const char **date) { /* skip everything that aren't letters or digits */ while(**date && !ISALNUM(**date)) (*date)++; } enum assume { DATE_MDAY, DATE_YEAR, DATE_TIME }; static time_t Curl_parsedate(const char *date) { time_t t = 0; int wdaynum=-1; /* day of the week number, 0-6 (mon-sun) */ int monnum=-1; /* month of the year number, 0-11 */ int mdaynum=-1; /* day of month, 1 - 31 */ int hournum=-1; int minnum=-1; int secnum=-1; int yearnum=-1; int tzoff=-1; struct tm tm; enum assume dignext = DATE_MDAY; const char *indate = date; /* save the original pointer */ int part = 0; /* max 6 parts */ while(*date && (part < 6)) { bool found=FALSE; skip(&date); if(ISALPHA(*date)) { /* a name coming up */ char buf[32]=""; size_t len; sscanf(date, "%31[A-Za-z]", buf); len = strlen(buf); if(wdaynum == -1) { wdaynum = checkday(buf, len); if(wdaynum != -1) found = TRUE; } if(!found && (monnum == -1)) { monnum = checkmonth(buf); if(monnum != -1) found = TRUE; } if(!found && (tzoff == -1)) { /* this just must be a time zone string */ tzoff = checktz(buf); if(tzoff != -1) found = TRUE; } if(!found) return -1; /* bad string */ date += len; } else if(ISDIGIT(*date)) { /* a digit */ int val; char *end; if((secnum == -1) && (3 == sscanf(date, "%02d:%02d:%02d", &hournum, &minnum, &secnum))) { /* time stamp! */ date += 8; found = TRUE; } else { val = (int)strtol(date, &end, 10); if((tzoff == -1) && ((end - date) == 4) && (val < 1300) && (indate< date) && ((date[-1] == '+' || date[-1] == '-'))) { /* four digits and a value less than 1300 and it is preceeded with a plus or minus. This is a time zone indication. */ found = TRUE; tzoff = (val/100 * 60 + val%100)*60; /* the + and - prefix indicates the local time compared to GMT, this we need ther reversed math to get what we want */ tzoff = date[-1]=='+'?-tzoff:tzoff; } if(((end - date) == 8) && (yearnum == -1) && (monnum == -1) && (mdaynum == -1)) { /* 8 digits, no year, month or day yet. This is YYYYMMDD */ found = TRUE; yearnum = val/10000; monnum = (val%10000)/100-1; /* month is 0 - 11 */ mdaynum = val%100; } if(!found && (dignext == DATE_MDAY) && (mdaynum == -1)) { if((val > 0) && (val<32)) { mdaynum = val; found = TRUE; } dignext = DATE_YEAR; } if(!found && (dignext == DATE_YEAR) && (yearnum == -1)) { yearnum = val; found = TRUE; if(yearnum < 1900) { if (yearnum > 70) yearnum += 1900; else yearnum += 2000; } if(mdaynum == -1) dignext = DATE_MDAY; } if(!found) return -1; date = end; } } part++; } if(-1 == secnum) secnum = minnum = hournum = 0; /* no time, make it zero */ if((-1 == mdaynum) || (-1 == monnum) || (-1 == yearnum)) /* lacks vital info, fail */ return -1; #if SIZEOF_TIME_T < 5 /* 32 bit time_t can only hold dates to the beginning of 2038 */ if(yearnum > 2037) return 0x7fffffff; #endif tm.tm_sec = secnum; tm.tm_min = minnum; tm.tm_hour = hournum; tm.tm_mday = mdaynum; tm.tm_mon = monnum; tm.tm_year = yearnum - 1900; tm.tm_wday = 0; tm.tm_yday = 0; tm.tm_isdst = 0; /* mktime() returns a time_t. time_t is often 32 bits, even on many architectures that feature 64 bit 'long'. Some systems have 64 bit time_t and deal with years beyond 2038. However, even some of the systems with 64 bit time_t returns -1 for dates beyond 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06) */ t = mktime(&tm); /* time zone adjust (cast t to int to compare to negative one) */ if(-1 != (int)t) { struct tm *gmt; long delta; time_t t2; #ifdef HAVE_GMTIME_R /* thread-safe version */ struct tm keeptime2; gmt = (struct tm *)gmtime_r(&t, &keeptime2); if(!gmt) return -1; /* illegal date/time */ t2 = mktime(gmt); #else /* It seems that at least the MSVC version of mktime() doesn't work properly if it gets the 'gmt' pointer passed in (which is a pointer returned from gmtime() pointing to static memory), so instead we copy the tm struct to a local struct and pass a pointer to that struct as input to mktime(). */ struct tm gmt2; gmt = gmtime(&t); /* use gmtime_r() if available */ if(!gmt) return -1; /* illegal date/time */ gmt2 = *gmt; t2 = mktime(&gmt2); #endif /* Add the time zone diff (between the given timezone and GMT) and the diff between the local time zone and GMT. */ delta = (long)((tzoff!=-1?tzoff:0) + (t - t2)); if((delta>0) && (t + delta < t)) return -1; /* time_t overflow */ t += delta; } return t; } time_t curl_getdate(const char *p, const time_t *now) { (void)now; return Curl_parsedate(p); }