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Diffstat (limited to 'src/libserver/http/http_util.c')
| -rw-r--r-- | src/libserver/http/http_util.c | 295 |
1 files changed, 295 insertions, 0 deletions
diff --git a/src/libserver/http/http_util.c b/src/libserver/http/http_util.c new file mode 100644 index 0000000..d5c4a57 --- /dev/null +++ b/src/libserver/http/http_util.c @@ -0,0 +1,295 @@ +/*- + * Copyright 2019 Vsevolod Stakhov + * + * Licensed 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. + */ + +#include "libserver/http/http_util.h" +#include "libutil/printf.h" +#include "libutil/util.h" + +static const gchar *http_week[] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"}; +static const gchar *http_month[] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun", + "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"}; + +/* + * Obtained from nginx + * Copyright (C) Igor Sysoev + */ +static guint mday[] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31}; + +time_t +rspamd_http_parse_date(const gchar *header, gsize len) +{ + const gchar *p, *end; + gint month; + guint day, year, hour, min, sec; + guint64 time; + enum { + no = 0, + rfc822, /* Tue, 10 Nov 2002 23:50:13 */ + rfc850, /* Tuesday, 10-Dec-02 23:50:13 */ + isoc /* Tue Dec 10 23:50:13 2002 */ + } fmt; + + fmt = 0; + if (len > 0) { + end = header + len; + } + else { + end = header + strlen(header); + } + + day = 32; + year = 2038; + + for (p = header; p < end; p++) { + if (*p == ',') { + break; + } + + if (*p == ' ') { + fmt = isoc; + break; + } + } + + for (p++; p < end; p++) + if (*p != ' ') { + break; + } + + if (end - p < 18) { + return (time_t) -1; + } + + if (fmt != isoc) { + if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') { + return (time_t) -1; + } + + day = (*p - '0') * 10 + *(p + 1) - '0'; + p += 2; + + if (*p == ' ') { + if (end - p < 18) { + return (time_t) -1; + } + fmt = rfc822; + } + else if (*p == '-') { + fmt = rfc850; + } + else { + return (time_t) -1; + } + + p++; + } + + switch (*p) { + + case 'J': + month = *(p + 1) == 'a' ? 0 : *(p + 2) == 'n' ? 5 + : 6; + break; + + case 'F': + month = 1; + break; + + case 'M': + month = *(p + 2) == 'r' ? 2 : 4; + break; + + case 'A': + month = *(p + 1) == 'p' ? 3 : 7; + break; + + case 'S': + month = 8; + break; + + case 'O': + month = 9; + break; + + case 'N': + month = 10; + break; + + case 'D': + month = 11; + break; + + default: + return (time_t) -1; + } + + p += 3; + + if ((fmt == rfc822 && *p != ' ') || (fmt == rfc850 && *p != '-')) { + return (time_t) -1; + } + + p++; + + if (fmt == rfc822) { + if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9' || *(p + 2) < '0' || *(p + 2) > '9' || *(p + 3) < '0' || *(p + 3) > '9') { + return (time_t) -1; + } + + year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100 + (*(p + 2) - '0') * 10 + *(p + 3) - '0'; + p += 4; + } + else if (fmt == rfc850) { + if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') { + return (time_t) -1; + } + + year = (*p - '0') * 10 + *(p + 1) - '0'; + year += (year < 70) ? 2000 : 1900; + p += 2; + } + + if (fmt == isoc) { + if (*p == ' ') { + p++; + } + + if (*p < '0' || *p > '9') { + return (time_t) -1; + } + + day = *p++ - '0'; + + if (*p != ' ') { + if (*p < '0' || *p > '9') { + return (time_t) -1; + } + + day = day * 10 + *p++ - '0'; + } + + if (end - p < 14) { + return (time_t) -1; + } + } + + if (*p++ != ' ') { + return (time_t) -1; + } + + if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') { + return (time_t) -1; + } + + hour = (*p - '0') * 10 + *(p + 1) - '0'; + p += 2; + + if (*p++ != ':') { + return (time_t) -1; + } + + if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') { + return (time_t) -1; + } + + min = (*p - '0') * 10 + *(p + 1) - '0'; + p += 2; + + if (*p++ != ':') { + return (time_t) -1; + } + + if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') { + return (time_t) -1; + } + + sec = (*p - '0') * 10 + *(p + 1) - '0'; + + if (fmt == isoc) { + p += 2; + + if (*p++ != ' ') { + return (time_t) -1; + } + + if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9' || *(p + 2) < '0' || *(p + 2) > '9' || *(p + 3) < '0' || *(p + 3) > '9') { + return (time_t) -1; + } + + year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100 + (*(p + 2) - '0') * 10 + *(p + 3) - '0'; + } + + if (hour > 23 || min > 59 || sec > 59) { + return (time_t) -1; + } + + if (day == 29 && month == 1) { + if ((year & 3) || ((year % 100 == 0) && (year % 400) != 0)) { + return (time_t) -1; + } + } + else if (day > mday[month]) { + return (time_t) -1; + } + + /* + * shift new year to March 1 and start months from 1 (not 0), + * it is needed for Gauss' formula + */ + + if (--month <= 0) { + month += 12; + year -= 1; + } + + /* Gauss' formula for Gregorian days since March 1, 1 BC */ + + time = (guint64) ( + /* days in years including leap years since March 1, 1 BC */ + + 365 * year + year / 4 - year / 100 + year / 400 + + /* days before the month */ + + + 367 * month / 12 - 30 + + /* days before the day */ + + + day - 1 + + /* + * 719527 days were between March 1, 1 BC and March 1, 1970, + * 31 and 28 days were in January and February 1970 + */ + + - 719527 + 31 + 28) * + 86400 + + hour * 3600 + min * 60 + sec; + + return (time_t) time; +} + +glong rspamd_http_date_format(gchar *buf, gsize len, time_t time) +{ + struct tm tms; + + rspamd_gmtime(time, &tms); + + return rspamd_snprintf(buf, len, "%s, %02d %s %4d %02d:%02d:%02d GMT", + http_week[tms.tm_wday], tms.tm_mday, + http_month[tms.tm_mon], tms.tm_year + 1900, + tms.tm_hour, tms.tm_min, tms.tm_sec); +}
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