| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * util_date.c: date parsing utility routines |
| * These routines are (hopefully) platform-independent. |
| * |
| * 27 Oct 1996 Roy Fielding |
| * Extracted (with many modifications) from mod_proxy.c and |
| * tested with over 50,000 randomly chosen valid date strings |
| * and several hundred variations of invalid date strings. |
| * |
| */ |
| |
| #include "ap_config.h" |
| #include "util_date.h" |
| #include <ctype.h> |
| #include <string.h> |
| |
| /* |
| * Compare a string to a mask |
| * Mask characters (arbitrary maximum is 256 characters, just in case): |
| * @ - uppercase letter |
| * $ - lowercase letter |
| * & - hex digit |
| * # - digit |
| * ~ - digit or space |
| * * - swallow remaining characters |
| * <x> - exact match for any other character |
| */ |
| API_EXPORT(int) ap_checkmask(const char *data, const char *mask) |
| { |
| int i; |
| char d; |
| |
| for (i = 0; i < 256; i++) { |
| d = data[i]; |
| switch (mask[i]) { |
| case '\0': |
| return (d == '\0'); |
| |
| case '*': |
| return 1; |
| |
| case '@': |
| if (!ap_isupper(d)) |
| return 0; |
| break; |
| case '$': |
| if (!ap_islower(d)) |
| return 0; |
| break; |
| case '#': |
| if (!ap_isdigit(d)) |
| return 0; |
| break; |
| case '&': |
| if (!ap_isxdigit(d)) |
| return 0; |
| break; |
| case '~': |
| if ((d != ' ') && !ap_isdigit(d)) |
| return 0; |
| break; |
| default: |
| if (mask[i] != d) |
| return 0; |
| break; |
| } |
| } |
| return 0; /* We only get here if mask is corrupted (exceeds 256) */ |
| } |
| |
| /* |
| * tm2sec converts a GMT tm structure into the number of seconds since |
| * 1st January 1970 UT. Note that we ignore tm_wday, tm_yday, and tm_dst. |
| * |
| * The return value is always a valid time_t value -- (time_t)0 is returned |
| * if the input date is outside that capable of being represented by time(), |
| * i.e., before Thu, 01 Jan 1970 00:00:00 for all systems and |
| * beyond 2038 for 32bit systems. |
| * |
| * This routine is intended to be very fast, much faster than mktime(). |
| */ |
| API_EXPORT(time_t) ap_tm2sec(const struct tm * t) |
| { |
| int year; |
| time_t days; |
| static const int dayoffset[12] = |
| {306, 337, 0, 31, 61, 92, 122, 153, 184, 214, 245, 275}; |
| |
| year = t->tm_year; |
| |
| if (year < 70 || ((sizeof(time_t) <= 4) && (year >= 138))) |
| return BAD_DATE; |
| |
| /* shift new year to 1st March in order to make leap year calc easy */ |
| |
| if (t->tm_mon < 2) |
| year--; |
| |
| /* Find number of days since 1st March 1900 (in the Gregorian calendar). */ |
| |
| days = year * 365 + year / 4 - year / 100 + (year / 100 + 3) / 4; |
| days += dayoffset[t->tm_mon] + t->tm_mday - 1; |
| days -= 25508; /* 1 jan 1970 is 25508 days since 1 mar 1900 */ |
| |
| days = ((days * 24 + t->tm_hour) * 60 + t->tm_min) * 60 + t->tm_sec; |
| |
| if (days < 0) |
| return BAD_DATE; /* must have overflowed */ |
| else |
| return days; /* must be a valid time */ |
| } |
| |
| /* |
| * Parses an HTTP date in one of three standard forms: |
| * |
| * 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 |
| * |
| * and returns the time_t number of seconds since 1 Jan 1970 GMT, or |
| * 0 if this would be out of range or if the date is invalid. |
| * |
| * The restricted HTTP syntax is |
| * |
| * HTTP-date = rfc1123-date | rfc850-date | asctime-date |
| * |
| * rfc1123-date = wkday "," SP date1 SP time SP "GMT" |
| * rfc850-date = weekday "," SP date2 SP time SP "GMT" |
| * asctime-date = wkday SP date3 SP time SP 4DIGIT |
| * |
| * date1 = 2DIGIT SP month SP 4DIGIT |
| * ; day month year (e.g., 02 Jun 1982) |
| * date2 = 2DIGIT "-" month "-" 2DIGIT |
| * ; day-month-year (e.g., 02-Jun-82) |
| * date3 = month SP ( 2DIGIT | ( SP 1DIGIT )) |
| * ; month day (e.g., Jun 2) |
| * |
| * time = 2DIGIT ":" 2DIGIT ":" 2DIGIT |
| * ; 00:00:00 - 23:59:59 |
| * |
| * wkday = "Mon" | "Tue" | "Wed" |
| * | "Thu" | "Fri" | "Sat" | "Sun" |
| * |
| * weekday = "Monday" | "Tuesday" | "Wednesday" |
| * | "Thursday" | "Friday" | "Saturday" | "Sunday" |
| * |
| * month = "Jan" | "Feb" | "Mar" | "Apr" |
| * | "May" | "Jun" | "Jul" | "Aug" |
| * | "Sep" | "Oct" | "Nov" | "Dec" |
| * |
| * However, for the sake of robustness (and Netscapeness), we ignore the |
| * weekday and anything after the time field (including the timezone). |
| * |
| * This routine is intended to be very fast; 10x faster than using sscanf. |
| * |
| * Originally from Andrew Daviel <andrew@vancouver-webpages.com>, 29 Jul 96 |
| * but many changes since then. |
| * |
| */ |
| API_EXPORT(time_t) ap_parseHTTPdate(const char *date) |
| { |
| struct tm ds; |
| int mint, mon; |
| const char *monstr, *timstr; |
| static const int months[12] = |
| { |
| ('J' << 16) | ('a' << 8) | 'n', ('F' << 16) | ('e' << 8) | 'b', |
| ('M' << 16) | ('a' << 8) | 'r', ('A' << 16) | ('p' << 8) | 'r', |
| ('M' << 16) | ('a' << 8) | 'y', ('J' << 16) | ('u' << 8) | 'n', |
| ('J' << 16) | ('u' << 8) | 'l', ('A' << 16) | ('u' << 8) | 'g', |
| ('S' << 16) | ('e' << 8) | 'p', ('O' << 16) | ('c' << 8) | 't', |
| ('N' << 16) | ('o' << 8) | 'v', ('D' << 16) | ('e' << 8) | 'c'}; |
| |
| if (!date) |
| return BAD_DATE; |
| |
| while (*date && ap_isspace(*date)) /* Find first non-whitespace char */ |
| ++date; |
| |
| if (*date == '\0') |
| return BAD_DATE; |
| |
| if ((date = strchr(date, ' ')) == NULL) /* Find space after weekday */ |
| return BAD_DATE; |
| |
| ++date; /* Now pointing to first char after space, which should be */ |
| /* start of the actual date information for all 3 formats. */ |
| |
| if (ap_checkmask(date, "## @$$ #### ##:##:## *")) { /* RFC 1123 format */ |
| ds.tm_year = ((date[7] - '0') * 10 + (date[8] - '0') - 19) * 100; |
| if (ds.tm_year < 0) |
| return BAD_DATE; |
| |
| ds.tm_year += ((date[9] - '0') * 10) + (date[10] - '0'); |
| |
| ds.tm_mday = ((date[0] - '0') * 10) + (date[1] - '0'); |
| |
| monstr = date + 3; |
| timstr = date + 12; |
| } |
| else if (ap_checkmask(date, "##-@$$-## ##:##:## *")) { /* RFC 850 format */ |
| ds.tm_year = ((date[7] - '0') * 10) + (date[8] - '0'); |
| if (ds.tm_year < 70) |
| ds.tm_year += 100; |
| |
| ds.tm_mday = ((date[0] - '0') * 10) + (date[1] - '0'); |
| |
| monstr = date + 3; |
| timstr = date + 10; |
| } |
| else if (ap_checkmask(date, "@$$ ~# ##:##:## ####*")) { /* asctime format */ |
| ds.tm_year = ((date[16] - '0') * 10 + (date[17] - '0') - 19) * 100; |
| if (ds.tm_year < 0) |
| return BAD_DATE; |
| |
| ds.tm_year += ((date[18] - '0') * 10) + (date[19] - '0'); |
| |
| if (date[4] == ' ') |
| ds.tm_mday = 0; |
| else |
| ds.tm_mday = (date[4] - '0') * 10; |
| |
| ds.tm_mday += (date[5] - '0'); |
| |
| monstr = date; |
| timstr = date + 7; |
| } |
| else |
| return BAD_DATE; |
| |
| if (ds.tm_mday <= 0 || ds.tm_mday > 31) |
| return BAD_DATE; |
| |
| ds.tm_hour = ((timstr[0] - '0') * 10) + (timstr[1] - '0'); |
| ds.tm_min = ((timstr[3] - '0') * 10) + (timstr[4] - '0'); |
| ds.tm_sec = ((timstr[6] - '0') * 10) + (timstr[7] - '0'); |
| |
| if ((ds.tm_hour > 23) || (ds.tm_min > 59) || (ds.tm_sec > 61)) |
| return BAD_DATE; |
| |
| mint = (monstr[0] << 16) | (monstr[1] << 8) | monstr[2]; |
| for (mon = 0; mon < 12; mon++) |
| if (mint == months[mon]) |
| break; |
| if (mon == 12) |
| return BAD_DATE; |
| |
| if ((ds.tm_mday == 31) && (mon == 3 || mon == 5 || mon == 8 || mon == 10)) |
| return BAD_DATE; |
| |
| /* February gets special check for leapyear */ |
| |
| if ((mon == 1) && |
| ((ds.tm_mday > 29) |
| || ((ds.tm_mday == 29) |
| && ((ds.tm_year & 3) |
| || (((ds.tm_year % 100) == 0) |
| && (((ds.tm_year % 400) != 100))))))) |
| return BAD_DATE; |
| |
| ds.tm_mon = mon; |
| |
| return ap_tm2sec(&ds); |
| } |