view src/os/win32/ngx_event_log.c @ 7690:8253424d1aff

Added size check to ngx_http_alloc_large_header_buffer(). This ensures that copying won't write more than the buffer size even if the buffer comes from hc->free and it is smaller than the large client header buffer size in the virtual host configuration. This might happen if size of large client header buffers is different in name-based virtual hosts, similarly to the problem with number of buffers fixed in 6926:e662cbf1b932.
author Maxim Dounin <mdounin@mdounin.ru>
date Thu, 06 Aug 2020 05:02:22 +0300
parents d620f497c50f
children
line wrap: on
line source

/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


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


#define NGX_MAX_ERROR_STR   2048


void ngx_cdecl
ngx_event_log(ngx_err_t err, const char *fmt, ...)
{
    u_char         *p, *last;
    long            types;
    HKEY            key;
    HANDLE          ev;
    va_list         args;
    u_char          text[NGX_MAX_ERROR_STR];
    const char     *msgarg[9];
    static u_char   netmsg[] = "%SystemRoot%\\System32\\netmsg.dll";

    last = text + NGX_MAX_ERROR_STR;
    p = text + GetModuleFileName(NULL, (char *) text, NGX_MAX_ERROR_STR - 50);

    *p++ = ':';
    ngx_linefeed(p);

    va_start(args, fmt);
    p = ngx_vslprintf(p, last, fmt, args);
    va_end(args);

    if (err) {
        p = ngx_log_errno(p, last, err);
    }

    if (p > last - NGX_LINEFEED_SIZE - 1) {
        p = last - NGX_LINEFEED_SIZE - 1;
    }

    ngx_linefeed(p);

    *p = '\0';

    /*
     * we do not log errors here since we use
     * Event Log only to log our own logs open errors
     */

    if (RegCreateKeyEx(HKEY_LOCAL_MACHINE,
           "SYSTEM\\CurrentControlSet\\Services\\EventLog\\Application\\nginx",
           0, NULL, REG_OPTION_NON_VOLATILE, KEY_SET_VALUE, NULL, &key, NULL)
        != 0)
    {
        return;
    }

    if (RegSetValueEx(key, "EventMessageFile", 0, REG_EXPAND_SZ,
                      netmsg, sizeof(netmsg) - 1)
        != 0)
    {
        return;
    }

    types = EVENTLOG_ERROR_TYPE;

    if (RegSetValueEx(key, "TypesSupported", 0, REG_DWORD,
                      (u_char *) &types, sizeof(long))
        != 0)
    {
        return;
    }

    RegCloseKey(key);

    ev = RegisterEventSource(NULL, "nginx");

    msgarg[0] = (char *) text;
    msgarg[1] = NULL;
    msgarg[2] = NULL;
    msgarg[3] = NULL;
    msgarg[4] = NULL;
    msgarg[5] = NULL;
    msgarg[6] = NULL;
    msgarg[7] = NULL;
    msgarg[8] = NULL;

    /*
     * the 3299 event id in netmsg.dll has the generic message format:
     *     "%1 %2 %3 %4 %5 %6 %7 %8 %9"
     */

    ReportEvent(ev, EVENTLOG_ERROR_TYPE, 0, 3299, NULL, 9, 0, msgarg, NULL);

    DeregisterEventSource(ev);
}