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HTTP/2: fixed possible alert about left open socket on shutdown. This could happen when graceful shutdown configured by worker_shutdown_timeout times out and is then followed by another timeout such as proxy_read_timeout. In this case, the HEADERS frame is added to the output queue, but attempt to send it fails (due to c->error forcibly set during graceful shutdown timeout). This triggers request finalization which attempts to close the stream. But the stream cannot be closed because there is a frame in the output queue, and the connection cannot be finalized. This leaves the connection open without any timer events leading to alert. The fix is to post write event when sending output queue fails on c->error. That will finalize the connection.
author Ruslan Ermilov <ru@nginx.com>
date Mon, 23 Sep 2019 15:45:32 +0300
parents e970de27966a
children 3bff3f397c05
line wrap: on
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/*
 * Copyright (C) Igor Sysoev
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_STREAM_SSL_H_INCLUDED_
#define _NGX_STREAM_SSL_H_INCLUDED_


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


typedef struct {
    ngx_msec_t       handshake_timeout;

    ngx_flag_t       prefer_server_ciphers;

    ngx_ssl_t        ssl;

    ngx_uint_t       listen;
    ngx_uint_t       protocols;

    ngx_uint_t       verify;
    ngx_uint_t       verify_depth;

    ssize_t          builtin_session_cache;

    time_t           session_timeout;

    ngx_array_t     *certificates;
    ngx_array_t     *certificate_keys;

    ngx_array_t     *certificate_values;
    ngx_array_t     *certificate_key_values;

    ngx_str_t        dhparam;
    ngx_str_t        ecdh_curve;
    ngx_str_t        client_certificate;
    ngx_str_t        trusted_certificate;
    ngx_str_t        crl;

    ngx_str_t        ciphers;

    ngx_array_t     *passwords;

    ngx_shm_zone_t  *shm_zone;

    ngx_flag_t       session_tickets;
    ngx_array_t     *session_ticket_keys;

    u_char          *file;
    ngx_uint_t       line;
} ngx_stream_ssl_conf_t;


extern ngx_module_t  ngx_stream_ssl_module;


#endif /* _NGX_STREAM_SSL_H_INCLUDED_ */