SSL: fixed SSL_clear_options() usage with OpenSSL 1.1.0+. In OpenSSL 1.1.0 the SSL_CTRL_CLEAR_OPTIONS macro was removed, so conditional compilation test on it results in SSL_clear_options() and SSL_CTX_clear_options() not being used. Notably, this caused "ssl_prefer_server_ciphers off" to not work in SNI-based virtual servers if server preference was switched on in the default server. It looks like the only possible fix is to test OPENSSL_VERSION_NUMBER explicitly.

/*
 * Copyright (C) Roman Arutyunyan
 * Copyright (C) Nginx, Inc.
 */


#ifndef _NGX_PROXY_PROTOCOL_H_INCLUDED_
#define _NGX_PROXY_PROTOCOL_H_INCLUDED_


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


#define NGX_PROXY_PROTOCOL_MAX_HEADER  107


u_char *ngx_proxy_protocol_read(ngx_connection_t *c, u_char *buf,
    u_char *last);
u_char *ngx_proxy_protocol_write(ngx_connection_t *c, u_char *buf,
    u_char *last);


#endif /* _NGX_PROXY_PROTOCOL_H_INCLUDED_ */