view src/core/ngx_parse_time.c @ 8532:b87b7092cedb

Improved logging of invalid headers. In 71edd9192f24 logging of invalid headers which were rejected with the NGX_HTTP_PARSE_INVALID_HEADER error was restricted to just the "client sent invalid header line" message, without any attempts to log the header itself. This patch returns logging of the header up to the invalid character and the character itself. The r->header_end pointer is now properly set in all cases to make logging possible. The same logging is also introduced when parsing headers from upstream servers.
author Maxim Dounin <mdounin@mdounin.ru>
date Mon, 28 Jun 2021 18:01:20 +0300
parents b38a8f0ca4a2
children
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#include <ngx_config.h>
#include <ngx_core.h>


static ngx_uint_t  mday[] = { 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 };

time_t
ngx_parse_http_time(u_char *value, size_t len)
{
    u_char      *p, *end;
    ngx_int_t    month;
    ngx_uint_t   day, year, hour, min, sec;
    uint64_t     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;
    end = value + len;

#if (NGX_SUPPRESS_WARN)
    day = 32;
    year = 2038;
#endif

    for (p = value; p < end; p++) {
        if (*p == ',') {
            break;
        }

        if (*p == ' ') {
            fmt = isoc;
            break;
        }
    }

    for (p++; p < end; p++) {
        if (*p != ' ') {
            break;
        }
    }

    if (end - p < 18) {
        return NGX_ERROR;
    }

    if (fmt != isoc) {
        if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
            return NGX_ERROR;
        }

        day = (*p - '0') * 10 + (*(p + 1) - '0');
        p += 2;

        if (*p == ' ') {
            if (end - p < 18) {
                return NGX_ERROR;
            }
            fmt = rfc822;

        } else if (*p == '-') {
            fmt = rfc850;

        } else {
            return NGX_ERROR;
        }

        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 NGX_ERROR;
    }

    p += 3;

    if ((fmt == rfc822 && *p != ' ') || (fmt == rfc850 && *p != '-')) {
        return NGX_ERROR;
    }

    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 NGX_ERROR;
        }

        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 NGX_ERROR;
        }

        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 NGX_ERROR;
        }

        day = *p++ - '0';

        if (*p != ' ') {
            if (*p < '0' || *p > '9') {
                return NGX_ERROR;
            }

            day = day * 10 + (*p++ - '0');
        }

        if (end - p < 14) {
            return NGX_ERROR;
        }
    }

    if (*p++ != ' ') {
        return NGX_ERROR;
    }

    if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
        return NGX_ERROR;
    }

    hour = (*p - '0') * 10 + (*(p + 1) - '0');
    p += 2;

    if (*p++ != ':') {
        return NGX_ERROR;
    }

    if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
        return NGX_ERROR;
    }

    min = (*p - '0') * 10 + (*(p + 1) - '0');
    p += 2;

    if (*p++ != ':') {
        return NGX_ERROR;
    }

    if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9') {
        return NGX_ERROR;
    }

    sec = (*p - '0') * 10 + (*(p + 1) - '0');

    if (fmt == isoc) {
        p += 2;

        if (*p++ != ' ') {
            return NGX_ERROR;
        }

        if (*p < '0' || *p > '9' || *(p + 1) < '0' || *(p + 1) > '9'
            || *(p + 2) < '0' || *(p + 2) > '9'
            || *(p + 3) < '0' || *(p + 3) > '9')
        {
            return NGX_ERROR;
        }

        year = (*p - '0') * 1000 + (*(p + 1) - '0') * 100
               + (*(p + 2) - '0') * 10 + (*(p + 3) - '0');
    }

    if (hour > 23 || min > 59 || sec > 59) {
        return NGX_ERROR;
    }

    if (day == 29 && month == 1) {
        if ((year & 3) || ((year % 100 == 0) && (year % 400) != 0)) {
            return NGX_ERROR;
        }

    } else if (day > mday[month]) {
        return NGX_ERROR;
    }

    /*
     * 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 = (uint64_t) (
            /* 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;

#if (NGX_TIME_T_SIZE <= 4)

    if (time > 0x7fffffff) {
        return NGX_ERROR;
    }

#endif

    return (time_t) time;
}