SSL: fixed segfault on renegotiation (ticket #1646). In e3ba4026c02d (1.15.4) nginx own renegotiation checks were disabled if SSL_OP_NO_RENEGOTIATION is available. But since SSL_OP_NO_RENEGOTIATION is only set on a connection, not in an SSL context, SSL_clear_option() removed it as long as a matching virtual server was found. This resulted in a segmentation fault similar to the one fixed in a6902a941279 (1.9.8), affecting nginx built with OpenSSL 1.1.0h or higher. To fix this, SSL_OP_NO_RENEGOTIATION is now explicitly set in ngx_http_ssl_servername() after adjusting options. Additionally, instead of c->ssl->renegotiation we now check c->ssl->handshaked, which seems to be a more correct flag to test, and will prevent the segmentation fault from happening even if SSL_OP_NO_RENEGOTIATION is not working.

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


#ifndef _NGX_MAIL_POP3_MODULE_H_INCLUDED_
#define _NGX_MAIL_POP3_MODULE_H_INCLUDED_


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


typedef struct {
    ngx_str_t    capability;
    ngx_str_t    starttls_capability;
    ngx_str_t    starttls_only_capability;
    ngx_str_t    auth_capability;

    ngx_uint_t   auth_methods;

    ngx_array_t  capabilities;
} ngx_mail_pop3_srv_conf_t;


void ngx_mail_pop3_init_session(ngx_mail_session_t *s, ngx_connection_t *c);
void ngx_mail_pop3_init_protocol(ngx_event_t *rev);
void ngx_mail_pop3_auth_state(ngx_event_t *rev);
ngx_int_t ngx_mail_pop3_parse_command(ngx_mail_session_t *s);


extern ngx_module_t  ngx_mail_pop3_module;


#endif /* _NGX_MAIL_POP3_MODULE_H_INCLUDED_ */