git.m6w6.name Git - m6w6/ext-http/blob - http_date_api.c

   1 /*
   2     +--------------------------------------------------------------------+
   3     | PECL :: http                                                       |
   4     +--------------------------------------------------------------------+
   5     | Redistribution and use in source and binary forms, with or without |
   6     | modification, are permitted provided that the conditions mentioned |
   7     | in the accompanying LICENSE file are met.                          |
   8     +--------------------------------------------------------------------+
   9     | Copyright (c) 2004-2006, Michael Wallner <mike@php.net>            |
  10     +--------------------------------------------------------------------+
  11 */
  12
  13 /* $Id$ */
  14
  15 #include "php_http.h"
  16
  17 #include "php_http_api.h"
  18 #include "php_http_date_api.h"
  19
  20 static inline int check_day(const char *day, size_t len);
  21 static inline int check_month(const char *month);
  22 static inline int check_tzone(const char *tzone);
  23 static inline time_t parse_date(const char *month);
  24
  25 /* {{{ day/month names */
  26 static const char *days[] = {
  27         "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
  28 };
  29 static const char *wkdays[] = {
  30         "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"
  31 };
  32 static const char *weekdays[] = {
  33         "Monday", "Tuesday", "Wednesday",
  34         "Thursday", "Friday", "Saturday", "Sunday"
  35 };
  36 static const char *months[] = {
  37         "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  38         "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
  39 };
  40 enum assume_next {
  41         DATE_MDAY,
  42         DATE_YEAR,
  43         DATE_TIME
  44 };
  45 #define DS -60
  46 static const struct time_zone {
  47         const char *name;
  48         const int offset;
  49 } time_zones[] = {
  50     {"GMT", 0},     /* Greenwich Mean */
  51     {"UTC", 0},     /* Universal (Coordinated) */
  52     {"WET", 0},     /* Western European */
  53     {"BST", 0 DS}, /* British Summer */
  54     {"WAT", 60},    /* West Africa */
  55     {"AST", 240},   /* Atlantic Standard */
  56     {"ADT", 240 DS},/* Atlantic Daylight */
  57     {"EST", 300},   /* Eastern Standard */
  58     {"EDT", 300 DS},/* Eastern Daylight */
  59     {"CST", 360},   /* Central Standard */
  60     {"CDT", 360 DS},/* Central Daylight */
  61     {"MST", 420},   /* Mountain Standard */
  62     {"MDT", 420 DS},/* Mountain Daylight */
  63     {"PST", 480},   /* Pacific Standard */
  64     {"PDT", 480 DS},/* Pacific Daylight */
  65     {"YST", 540},   /* Yukon Standard */
  66     {"YDT", 540 DS},/* Yukon Daylight */
  67     {"HST", 600},   /* Hawaii Standard */
  68     {"HDT", 600 DS},/* Hawaii Daylight */
  69     {"CAT", 600},   /* Central Alaska */
  70     {"AHST", 600},  /* Alaska-Hawaii Standard */
  71     {"NT",  660},   /* Nome */
  72     {"IDLW", 720},  /* International Date Line West */
  73     {"CET", -60},   /* Central European */
  74     {"MET", -60},   /* Middle European */
  75     {"MEWT", -60},  /* Middle European Winter */
  76     {"MEST", -60 DS},/* Middle European Summer */
  77     {"CEST", -60 DS},/* Central European Summer */
  78     {"MESZ", -60 DS},/* Middle European Summer */
  79     {"FWT", -60},   /* French Winter */
  80     {"FST", -60 DS},/* French Summer */
  81     {"EET", -120},  /* Eastern Europe, USSR Zone 1 */
  82     {"WAST", -420}, /* West Australian Standard */
  83     {"WADT", -420 DS},/* West Australian Daylight */
  84     {"CCT", -480},  /* China Coast, USSR Zone 7 */
  85     {"JST", -540},  /* Japan Standard, USSR Zone 8 */
  86     {"EAST", -600}, /* Eastern Australian Standard */
  87     {"EADT", -600 DS},/* Eastern Australian Daylight */
  88     {"GST", -600},  /* Guam Standard, USSR Zone 9 */
  89     {"NZT", -720},  /* New Zealand */
  90     {"NZST", -720}, /* New Zealand Standard */
  91     {"NZDT", -720 DS},/* New Zealand Daylight */
  92     {"IDLE", -720}, /* International Date Line East */
  93 };
  94 /* }}} */
  95
  96 /* {{{ Day/Month/TZ checks for http_parse_date()
  97         Originally by libcurl, Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al. */
  98 static inline int check_day(const char *day, size_t len)
  99 {
 100         int i;
 101         const char * const *check = (len > 3) ? &weekdays[0] : &wkdays[0];
 102         for (i = 0; i < 7; i++) {
 103             if (!strcmp(day, check[0])) {
 104                 return i;
 105                 }
 106                 check++;
 107         }
 108         return -1;
 109 }
 110
 111 static inline int check_month(const char *month)
 112 {
 113         int i;
 114         const char * const *check = &months[0];
 115         for (i = 0; i < 12; i++) {
 116                 if (!strcmp(month, check[0])) {
 117                         return i;
 118                 }
 119                 check++;
 120         }
 121         return -1;
 122 }
 123
 124 /* return the time zone offset between GMT and the input one, in number
 125    of seconds or -1 if the timezone wasn't found/legal */
 126
 127 static inline int check_tzone(const char *tzone)
 128 {
 129         unsigned i;
 130         const struct time_zone *check = time_zones;
 131         for (i = 0; i < sizeof(time_zones) / sizeof(time_zones[0]); i++) {
 132                 if (!strcmp(tzone, check->name)) {
 133                         return check->offset * 60;
 134                 }
 135                 check++;
 136         }
 137         return -1;
 138 }
 139 /* }}} */
 140
 141 /* {{{ char *http_date(time_t) */
 142 PHP_HTTP_API char *_http_date(time_t t TSRMLS_DC)
 143 {
 144         struct tm *gmtime, tmbuf;
 145
 146         if ((gmtime = php_gmtime_r(&t, &tmbuf))) {
 147                 char *date = ecalloc(1, 31);
 148                 snprintf(date, 30,
 149                         "%s, %02d %s %04d %02d:%02d:%02d GMT",
 150                         days[gmtime->tm_wday], gmtime->tm_mday,
 151                         months[gmtime->tm_mon], gmtime->tm_year + 1900,
 152                         gmtime->tm_hour, gmtime->tm_min, gmtime->tm_sec
 153                 );
 154                 return date;
 155         }
 156
 157         return NULL;
 158 }
 159 /* }}} */
 160
 161 /* {{{ time_t http_parse_date(char *) */
 162 PHP_HTTP_API time_t _http_parse_date(const char *date TSRMLS_DC)
 163 {
 164         time_t t = -1;
 165
 166 #ifdef PHP_WIN32
 167         /* fix odd offsets with Win32 */
 168         char tzput[64] = "TZ=";
 169         const char *tzget = NULL;
 170
 171         if ((tzget = getenv("TZ"))) {
 172                 strlcat(tzput, tzget, 63);
 173         }
 174         putenv("TZ=GMT");
 175 #endif
 176
 177         t = parse_date(date);
 178
 179 #ifdef PHP_WIN32
 180         putenv(tzput);
 181 #endif
 182
 183         if (-1 == t) {
 184                 http_error_ex(HE_NOTICE, HTTP_E_RUNTIME, "Could not parse date: %s", date);
 185         }
 186
 187         return t;
 188 }
 189 /* }}} */
 190
 191 /*      time_t parse_date(char *)
 192         Originally by libcurl, Copyright (C) 1998 - 2004, Daniel Stenberg, <daniel@haxx.se>, et al. */
 193 static inline time_t parse_date(const char *date)
 194 {
 195         time_t t = 0;
 196         int tz_offset = -1, year = -1, month = -1, monthday = -1, weekday = -1,
 197                 hours = -1, minutes = -1, seconds = -1;
 198         struct tm tm;
 199         enum assume_next dignext = DATE_MDAY;
 200         const char *indate = date;
 201
 202         int part = 0; /* max 6 parts */
 203
 204         while (*date && (part < 6)) {
 205                 int found = 0;
 206
 207                 while (*date && !isalnum(*date)) {
 208                         date++;
 209                 }
 210
 211                 if (isalpha(*date)) {
 212                         /* a name coming up */
 213                         char buf[32] = "";
 214                         size_t len;
 215                         sscanf(date, "%31[A-Za-z]", buf);
 216                         len = strlen(buf);
 217
 218                         if (weekday == -1) {
 219                                 weekday = check_day(buf, len);
 220                                 if (weekday != -1) {
 221                                         found = 1;
 222                                 }
 223                         }
 224
 225                         if (!found && (month == -1)) {
 226                                 month = check_month(buf);
 227                                 if (month != -1) {
 228                                         found = 1;
 229                                 }
 230                         }
 231
 232                         if (!found && (tz_offset == -1)) {
 233                                 /* this just must be a time zone string */
 234                                 tz_offset = check_tzone(buf);
 235                                 if (tz_offset != -1) {
 236                                         found = 1;
 237                                 }
 238                         }
 239
 240                         if (!found) {
 241                                 return -1; /* bad string */
 242                         }
 243                         date += len;
 244                 }
 245                 else if (isdigit(*date)) {
 246                         /* a digit */
 247                         int val;
 248                         char *end;
 249                         if ((seconds == -1) &&
 250                                 (3 == sscanf(date, "%02d:%02d:%02d", &hours, &minutes, &seconds))) {
 251                                 /* time stamp! */
 252                                 date += 8;
 253                                 found = 1;
 254                         }
 255                         else {
 256                                 val = (int) strtol(date, &end, 10);
 257
 258                                 if ((tz_offset == -1) && ((end - date) == 4) && (val < 1300) &&
 259                                         (indate < date) && ((date[-1] == '+' || date[-1] == '-'))) {
 260                                         /* four digits and a value less than 1300 and it is preceeded with
 261                                         a plus or minus. This is a time zone indication. */
 262                                         found = 1;
 263                                         tz_offset = (val / 100 * 60 + val % 100) * 60;
 264
 265                                         /* the + and - prefix indicates the local time compared to GMT,
 266                                         this we need ther reversed math to get what we want */
 267                                         tz_offset = date[-1] == '+' ? -tz_offset : tz_offset;
 268                                 }
 269
 270                                 if (((end - date) == 8) && (year == -1) && (month == -1) && (monthday == -1)) {
 271                                         /* 8 digits, no year, month or day yet. This is YYYYMMDD */
 272                                         found = 1;
 273                                         year = val / 10000;
 274                                         month = (val % 10000) / 100 - 1; /* month is 0 - 11 */
 275                                         monthday = val % 100;
 276                                 }
 277
 278                                 if (!found && (dignext == DATE_MDAY) && (monthday == -1)) {
 279                                         if ((val > 0) && (val < 32)) {
 280                                                 monthday = val;
 281                                                 found = 1;
 282                                         }
 283                                         dignext = DATE_YEAR;
 284                                 }
 285
 286                                 if (!found && (dignext == DATE_YEAR) && (year == -1)) {
 287                                         year = val;
 288                                         found = 1;
 289                                         if (year < 1900) {
 290                                                 year += year > 70 ? 1900 : 2000;
 291                                         }
 292                                         if(monthday == -1) {
 293                                                 dignext = DATE_MDAY;
 294                                         }
 295                                 }
 296
 297                                 if (!found) {
 298                                         return -1;
 299                                 }
 300
 301                                 date = end;
 302                         }
 303                 }
 304
 305                 part++;
 306         }
 307
 308         if (-1 == seconds) {
 309                 seconds = minutes = hours = 0; /* no time, make it zero */
 310         }
 311
 312         if ((-1 == monthday) || (-1 == month) || (-1 == year)) {
 313                 /* lacks vital info, fail */
 314                 return -1;
 315         }
 316
 317         if (sizeof(time_t) < 5) {
 318                 /* 32 bit time_t can only hold dates to the beginning of 2038 */
 319                 if (year > 2037) {
 320                         return 0x7fffffff;
 321                 }
 322         }
 323
 324         tm.tm_sec = seconds;
 325         tm.tm_min = minutes;
 326         tm.tm_hour = hours;
 327         tm.tm_mday = monthday;
 328         tm.tm_mon = month;
 329         tm.tm_year = year - 1900;
 330         tm.tm_wday = 0;
 331         tm.tm_yday = 0;
 332         tm.tm_isdst = 0;
 333
 334         t = mktime(&tm);
 335
 336         /* time zone adjust */
 337         if (t != -1) {
 338                 struct tm *gmt, keeptime2;
 339                 long delta;
 340                 time_t t2;
 341
 342                 if(!(gmt = php_gmtime_r(&t, &keeptime2))) {
 343                         return -1; /* illegal date/time */
 344                 }
 345
 346                 t2 = mktime(gmt);
 347
 348                 /* Add the time zone diff (between the given timezone and GMT) and the
 349                 diff between the local time zone and GMT. */
 350                 delta = (tz_offset != -1 ? tz_offset : 0) + (t - t2);
 351
 352                 if((delta > 0) && (t + delta < t)) {
 353                         return -1; /* time_t overflow */
 354                 }
 355
 356                 t += delta;
 357         }
 358
 359         return t;
 360 }
 361 /* }}} */
 362
 363
 364 /*
 365  * Local variables:
 366  * tab-width: 4
 367  * c-basic-offset: 4
 368  * End:
 369  * vim600: sw=4 ts=4 fdm=marker
 370  * vim<600: sw=4 ts=4
 371  */
 372