diff options
Diffstat (limited to 'lib/asn1/timegm.c')
| -rw-r--r-- | lib/asn1/timegm.c | 124 |
1 files changed, 87 insertions, 37 deletions
diff --git a/lib/asn1/timegm.c b/lib/asn1/timegm.c index 33b9684a5d87..d9f4adbd5591 100644 --- a/lib/asn1/timegm.c +++ b/lib/asn1/timegm.c @@ -1,39 +1,39 @@ /* - * Copyright (c) 1997 Kungliga Tekniska Högskolan - * (Royal Institute of Technology, Stockholm, Sweden). - * All rights reserved. + * Copyright (c) 1997 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: * - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. * - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. * - * 3. Neither the name of the Institute nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. * - * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. */ #include "der_locl.h" -RCSID("$Id: timegm.c 21366 2007-06-27 10:06:22Z lha $"); +#define ASN1_MAX_YEAR 2000 static int is_leap(unsigned y) @@ -42,7 +42,11 @@ is_leap(unsigned y) return (y % 4) == 0 && ((y % 100) != 0 || (y % 400) == 0); } -/* +static const unsigned ndays[2][12] ={ + {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, + {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}}; + +/* * This is a simplifed version of timegm(3) that doesn't accept out of * bound values that timegm(3) normally accepts but those are not * valid in asn1 encodings. @@ -51,23 +55,26 @@ is_leap(unsigned y) time_t _der_timegm (struct tm *tm) { - static const unsigned ndays[2][12] ={ - {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}, - {31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}}; time_t res = 0; - unsigned i; + int i; - if (tm->tm_year < 0) + /* + * See comment in _der_gmtime + */ + if (tm->tm_year > ASN1_MAX_YEAR) + return 0; + + if (tm->tm_year < 0) return -1; - if (tm->tm_mon < 0 || tm->tm_mon > 11) + if (tm->tm_mon < 0 || tm->tm_mon > 11) return -1; - if (tm->tm_mday < 1 || tm->tm_mday > ndays[is_leap(tm->tm_year)][tm->tm_mon]) + if (tm->tm_mday < 1 || tm->tm_mday > (int)ndays[is_leap(tm->tm_year)][tm->tm_mon]) return -1; - if (tm->tm_hour < 0 || tm->tm_hour > 23) + if (tm->tm_hour < 0 || tm->tm_hour > 23) return -1; - if (tm->tm_min < 0 || tm->tm_min > 59) + if (tm->tm_min < 0 || tm->tm_min > 59) return -1; - if (tm->tm_sec < 0 || tm->tm_sec > 59) + if (tm->tm_sec < 0 || tm->tm_sec > 59) return -1; for (i = 70; i < tm->tm_year; ++i) @@ -84,3 +91,46 @@ _der_timegm (struct tm *tm) res += tm->tm_sec; return res; } + +struct tm * +_der_gmtime(time_t t, struct tm *tm) +{ + time_t secday = t % (3600 * 24); + time_t days = t / (3600 * 24); + + memset(tm, 0, sizeof(*tm)); + + tm->tm_sec = secday % 60; + tm->tm_min = (secday % 3600) / 60; + tm->tm_hour = secday / 3600; + + /* + * Refuse to calculate time ~ 2000 years into the future, this is + * not possible for systems where time_t is a int32_t, however, + * when time_t is a int64_t, that can happen, and this becomes a + * denial of sevice. + */ + if (days > (ASN1_MAX_YEAR * 365)) + return NULL; + + tm->tm_year = 70; + while(1) { + unsigned dayinyear = (is_leap(tm->tm_year) ? 366 : 365); + if (days < dayinyear) + break; + tm->tm_year += 1; + days -= dayinyear; + } + tm->tm_mon = 0; + + while (1) { + unsigned daysinmonth = ndays[is_leap(tm->tm_year)][tm->tm_mon]; + if (days < daysinmonth) + break; + days -= daysinmonth; + tm->tm_mon++; + } + tm->tm_mday = days + 1; + + return tm; +} |