view src/core/ngx_parse.c @ 9225:1c9264603adc

Syslog: introduced ngx_syslog_send() error logging moderation. Errors when logging to syslog are now logged at most once per second. This ensures that persistent errors won't flood other logs, and spontaneous errors, such as ENOBUFS as observed on BSD systems when syslogd cannot cope with load, or EAGAIN as seen in similar situation on Linux, won't further overload logging subsystem, leading to more errors. Further, errors now can only trigger reconnects at most once per second. This ensures that persistent errors, which cannot be fixed with reconnects, don't trigger too much unneeded work. Additionally, in case of connection errors, such as when syslogd is not running, connection attempts are only made once per second.
author Maxim Dounin <mdounin@mdounin.ru>
date Fri, 01 Mar 2024 05:42:12 +0300
parents 87cf6ddb41c2
children
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


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


ssize_t
ngx_parse_size(ngx_str_t *line)
{
    u_char   unit;
    size_t   len;
    ssize_t  size, scale, max;

    len = line->len;

    if (len == 0) {
        return NGX_ERROR;
    }

    unit = line->data[len - 1];

    switch (unit) {
    case 'K':
    case 'k':
        len--;
        max = NGX_MAX_SIZE_T_VALUE / 1024;
        scale = 1024;
        break;

    case 'M':
    case 'm':
        len--;
        max = NGX_MAX_SIZE_T_VALUE / (1024 * 1024);
        scale = 1024 * 1024;
        break;

    default:
        max = NGX_MAX_SIZE_T_VALUE;
        scale = 1;
    }

    size = ngx_atosz(line->data, len);
    if (size == NGX_ERROR || size > max) {
        return NGX_ERROR;
    }

    size *= scale;

    return size;
}


off_t
ngx_parse_offset(ngx_str_t *line)
{
    u_char  unit;
    off_t   offset, scale, max;
    size_t  len;

    len = line->len;

    if (len == 0) {
        return NGX_ERROR;
    }

    unit = line->data[len - 1];

    switch (unit) {
    case 'K':
    case 'k':
        len--;
        max = NGX_MAX_OFF_T_VALUE / 1024;
        scale = 1024;
        break;

    case 'M':
    case 'm':
        len--;
        max = NGX_MAX_OFF_T_VALUE / (1024 * 1024);
        scale = 1024 * 1024;
        break;

    case 'G':
    case 'g':
        len--;
        max = NGX_MAX_OFF_T_VALUE / (1024 * 1024 * 1024);
        scale = 1024 * 1024 * 1024;
        break;

    default:
        max = NGX_MAX_OFF_T_VALUE;
        scale = 1;
    }

    offset = ngx_atoof(line->data, len);
    if (offset == NGX_ERROR || offset > max) {
        return NGX_ERROR;
    }

    offset *= scale;

    return offset;
}


ngx_int_t
ngx_parse_time(ngx_str_t *line, ngx_uint_t is_sec)
{
    u_char      *p, *last;
    ngx_int_t    value, total, scale;
    ngx_int_t    max, cutoff, cutlim;
    ngx_uint_t   valid;
    enum {
        st_start = 0,
        st_year,
        st_month,
        st_week,
        st_day,
        st_hour,
        st_min,
        st_sec,
        st_msec,
        st_last
    } step;

    valid = 0;
    value = 0;
    total = 0;
    cutoff = NGX_MAX_INT_T_VALUE / 10;
    cutlim = NGX_MAX_INT_T_VALUE % 10;
    step = is_sec ? st_start : st_month;

    p = line->data;
    last = p + line->len;

    while (p < last) {

        if (*p >= '0' && *p <= '9') {
            if (value >= cutoff && (value > cutoff || *p - '0' > cutlim)) {
                return NGX_ERROR;
            }

            value = value * 10 + (*p++ - '0');
            valid = 1;
            continue;
        }

        switch (*p++) {

        case 'y':
            if (step > st_start) {
                return NGX_ERROR;
            }
            step = st_year;
            max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24 * 365);
            scale = 60 * 60 * 24 * 365;
            break;

        case 'M':
            if (step >= st_month) {
                return NGX_ERROR;
            }
            step = st_month;
            max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24 * 30);
            scale = 60 * 60 * 24 * 30;
            break;

        case 'w':
            if (step >= st_week) {
                return NGX_ERROR;
            }
            step = st_week;
            max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24 * 7);
            scale = 60 * 60 * 24 * 7;
            break;

        case 'd':
            if (step >= st_day) {
                return NGX_ERROR;
            }
            step = st_day;
            max = NGX_MAX_INT_T_VALUE / (60 * 60 * 24);
            scale = 60 * 60 * 24;
            break;

        case 'h':
            if (step >= st_hour) {
                return NGX_ERROR;
            }
            step = st_hour;
            max = NGX_MAX_INT_T_VALUE / (60 * 60);
            scale = 60 * 60;
            break;

        case 'm':
            if (p < last && *p == 's') {
                if (is_sec || step >= st_msec) {
                    return NGX_ERROR;
                }
                p++;
                step = st_msec;
                max = NGX_MAX_INT_T_VALUE;
                scale = 1;
                break;
            }

            if (step >= st_min) {
                return NGX_ERROR;
            }
            step = st_min;
            max = NGX_MAX_INT_T_VALUE / 60;
            scale = 60;
            break;

        case 's':
            if (step >= st_sec) {
                return NGX_ERROR;
            }
            step = st_sec;
            max = NGX_MAX_INT_T_VALUE;
            scale = 1;
            break;

        case ' ':
            if (step >= st_sec) {
                return NGX_ERROR;
            }
            step = st_last;
            max = NGX_MAX_INT_T_VALUE;
            scale = 1;
            break;

        default:
            return NGX_ERROR;
        }

        if (step != st_msec && !is_sec) {
            scale *= 1000;
            max /= 1000;
        }

        if (value > max) {
            return NGX_ERROR;
        }

        value *= scale;

        if (total > NGX_MAX_INT_T_VALUE - value) {
            return NGX_ERROR;
        }

        total += value;

        value = 0;

        while (p < last && *p == ' ') {
            p++;
        }
    }

    if (!valid) {
        return NGX_ERROR;
    }

    if (!is_sec) {
        if (value > NGX_MAX_INT_T_VALUE / 1000) {
            return NGX_ERROR;
        }

        value *= 1000;
    }

    if (total > NGX_MAX_INT_T_VALUE - value) {
        return NGX_ERROR;
    }

    return total + value;
}