| /*************************************************************************** |
| * _ _ ____ _ |
| * Project ___| | | | _ \| | |
| * / __| | | | |_) | | |
| * | (__| |_| | _ <| |___ |
| * \___|\___/|_| \_\_____| |
| * |
| * Copyright (C) 1998 - 2012, 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. |
| * |
| ***************************************************************************/ |
| /* |
| 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" |
| |
| #ifdef HAVE_LIMITS_H |
| #include <limits.h> |
| #endif |
| |
| #include <curl/curl.h> |
| #include "rawstr.h" |
| #include "warnless.h" |
| #include "parsedate.h" |
| |
| 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 { |
| char name[5]; |
| int offset; /* +/- in minutes */ |
| }; |
| |
| /* |
| * parsedate() |
| * |
| * Returns: |
| * |
| * PARSEDATE_OK - a fine conversion |
| * PARSEDATE_FAIL - failed to convert |
| * PARSEDATE_LATER - time overflow at the far end of time_t |
| * PARSEDATE_SOONER - time underflow at the low end of time_t |
| */ |
| |
| static int parsedate(const char *date, time_t *output); |
| |
| #define PARSEDATE_OK 0 |
| #define PARSEDATE_FAIL -1 |
| #define PARSEDATE_LATER 1 |
| #define PARSEDATE_SOONER 2 |
| |
| /* 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 */ |
| /* Next up: Military timezone names. RFC822 allowed these, but (as noted in |
| RFC 1123) had their signs wrong. Here we use the correct signs to match |
| actual military usage. |
| */ |
| {"A", +1 * 60}, /* Alpha */ |
| {"B", +2 * 60}, /* Bravo */ |
| {"C", +3 * 60}, /* Charlie */ |
| {"D", +4 * 60}, /* Delta */ |
| {"E", +5 * 60}, /* Echo */ |
| {"F", +6 * 60}, /* Foxtrot */ |
| {"G", +7 * 60}, /* Golf */ |
| {"H", +8 * 60}, /* Hotel */ |
| {"I", +9 * 60}, /* India */ |
| /* "J", Juliet is not used as a timezone, to indicate the observer's local |
| time */ |
| {"K", +10 * 60}, /* Kilo */ |
| {"L", +11 * 60}, /* Lima */ |
| {"M", +12 * 60}, /* Mike */ |
| {"N", -1 * 60}, /* November */ |
| {"O", -2 * 60}, /* Oscar */ |
| {"P", -3 * 60}, /* Papa */ |
| {"Q", -4 * 60}, /* Quebec */ |
| {"R", -5 * 60}, /* Romeo */ |
| {"S", -6 * 60}, /* Sierra */ |
| {"T", -7 * 60}, /* Tango */ |
| {"U", -8 * 60}, /* Uniform */ |
| {"V", -9 * 60}, /* Victor */ |
| {"W", -10 * 60}, /* Whiskey */ |
| {"X", -11 * 60}, /* X-ray */ |
| {"Y", -12 * 60}, /* Yankee */ |
| {"Z", 0}, /* Zulu, zero meridian, a.k.a. UTC */ |
| }; |
| |
| /* returns: |
| -1 no day |
| 0 monday - 6 sunday |
| */ |
| |
| static int checkday(const 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_raw_equal(check, what[0])) { |
| found=TRUE; |
| break; |
| } |
| what++; |
| } |
| return found?i:-1; |
| } |
| |
| static int checkmonth(const char *check) |
| { |
| int i; |
| const char * const *what; |
| bool found= FALSE; |
| |
| what = &Curl_month[0]; |
| for(i=0; i<12; i++) { |
| if(Curl_raw_equal(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(const 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_raw_equal(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 |
| }; |
| |
| /* this is a clone of 'struct tm' but with all fields we don't need or use |
| cut out */ |
| struct my_tm { |
| int tm_sec; |
| int tm_min; |
| int tm_hour; |
| int tm_mday; |
| int tm_mon; |
| int tm_year; |
| }; |
| |
| /* struct tm to time since epoch in GMT time zone. |
| * This is similar to the standard mktime function but for GMT only, and |
| * doesn't suffer from the various bugs and portability problems that |
| * some systems' implementations have. |
| */ |
| static time_t my_timegm(struct my_tm *tm) |
| { |
| static const int month_days_cumulative [12] = |
| { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334 }; |
| int month, year, leap_days; |
| |
| if(tm->tm_year < 70) |
| /* we don't support years before 1970 as they will cause this function |
| to return a negative value */ |
| return -1; |
| |
| year = tm->tm_year + 1900; |
| month = tm->tm_mon; |
| if(month < 0) { |
| year += (11 - month) / 12; |
| month = 11 - (11 - month) % 12; |
| } |
| else if(month >= 12) { |
| year -= month / 12; |
| month = month % 12; |
| } |
| |
| leap_days = year - (tm->tm_mon <= 1); |
| leap_days = ((leap_days / 4) - (leap_days / 100) + (leap_days / 400) |
| - (1969 / 4) + (1969 / 100) - (1969 / 400)); |
| |
| return ((((time_t) (year - 1970) * 365 |
| + leap_days + month_days_cumulative [month] + tm->tm_mday - 1) * 24 |
| + tm->tm_hour) * 60 + tm->tm_min) * 60 + tm->tm_sec; |
| } |
| |
| /* |
| * parsedate() |
| * |
| * Returns: |
| * |
| * PARSEDATE_OK - a fine conversion |
| * PARSEDATE_FAIL - failed to convert |
| * PARSEDATE_LATER - time overflow at the far end of time_t |
| * PARSEDATE_SOONER - time underflow at the low end of time_t |
| */ |
| |
| static int parsedate(const char *date, time_t *output) |
| { |
| 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 my_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[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz]", |
| 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 PARSEDATE_FAIL; /* 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; |
| } |
| else if((secnum == -1) && |
| (2 == sscanf(date, "%02d:%02d", &hournum, &minnum))) { |
| /* time stamp without seconds */ |
| date += 5; |
| secnum = 0; |
| } |
| else { |
| long lval; |
| int error; |
| int old_errno; |
| |
| old_errno = ERRNO; |
| SET_ERRNO(0); |
| lval = strtol(date, &end, 10); |
| error = ERRNO; |
| if(error != old_errno) |
| SET_ERRNO(old_errno); |
| |
| if(error) |
| return PARSEDATE_FAIL; |
| |
| if((lval > (long)INT_MAX) || (lval < (long)INT_MIN)) |
| return PARSEDATE_FAIL; |
| |
| val = curlx_sltosi(lval); |
| |
| if((tzoff == -1) && |
| ((end - date) == 4) && |
| (val <= 1400) && |
| (indate< date) && |
| ((date[-1] == '+' || date[-1] == '-'))) { |
| /* four digits and a value less than or equal to 1400 (to take into |
| account all sorts of funny time zone diffs) and it is preceded |
| with a plus or minus. This is a time zone indication. 1400 is |
| picked since +1300 is frequently used and +1400 is mentioned as |
| an edge number in the document "ISO C 200X Proposal: Timezone |
| Functions" at http://david.tribble.com/text/c0xtimezone.html If |
| anyone has a more authoritative source for the exact maximum time |
| zone offsets, please speak up! */ |
| 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 PARSEDATE_FAIL; |
| |
| 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 PARSEDATE_FAIL; |
| |
| #if SIZEOF_TIME_T < 5 |
| /* 32 bit time_t can only hold dates to the beginning of 2038 */ |
| if(yearnum > 2037) { |
| *output = 0x7fffffff; |
| return PARSEDATE_LATER; |
| } |
| #endif |
| |
| if(yearnum < 1970) { |
| *output = 0; |
| return PARSEDATE_SOONER; |
| } |
| |
| if((mdaynum > 31) || (monnum > 11) || |
| (hournum > 23) || (minnum > 59) || (secnum > 60)) |
| return PARSEDATE_FAIL; /* clearly an illegal date */ |
| |
| 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; |
| |
| /* my_timegm() 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 on some of the systems with 64 bit time_t mktime() returns -1 for |
| dates beyond 03:14:07 UTC, January 19, 2038. (Such as AIX 5100-06) |
| */ |
| t = my_timegm(&tm); |
| |
| /* time zone adjust (cast t to int to compare to negative one) */ |
| if(-1 != (int)t) { |
| |
| /* Add the time zone diff between local time zone and GMT. */ |
| long delta = (long)(tzoff!=-1?tzoff:0); |
| |
| if((delta>0) && (t + delta < t)) |
| return -1; /* time_t overflow */ |
| |
| t += delta; |
| } |
| |
| *output = t; |
| |
| return PARSEDATE_OK; |
| } |
| |
| time_t curl_getdate(const char *p, const time_t *now) |
| { |
| time_t parsed; |
| int rc = parsedate(p, &parsed); |
| (void)now; /* legacy argument from the past that we ignore */ |
| |
| switch(rc) { |
| case PARSEDATE_OK: |
| case PARSEDATE_LATER: |
| case PARSEDATE_SOONER: |
| return parsed; |
| } |
| /* everything else is fail */ |
| return -1; |
| } |
| |
| /* |
| * Curl_gmtime() is a gmtime() replacement for portability. Do not use the |
| * gmtime_r() or gmtime() functions anywhere else but here. |
| * |
| * To make sure no such function calls slip in, we define them to cause build |
| * errors, which is why we use the name within parentheses in this function. |
| * |
| */ |
| |
| 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 |
| 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; |
| } |
