text: 
  /*
   * Copyright (C) Igor Sysoev
   * Copyright (C) Nginx, Inc.
   */
  
  
  #ifndef _NGX_EVENT_OPENSSL_H_INCLUDED_
  #define _NGX_EVENT_OPENSSL_H_INCLUDED_
  
  
  #include <ngx_config.h>
  #include <ngx_core.h>
  
  #include <openssl/ssl.h>
  #include <openssl/err.h>
  #include <openssl/conf.h>
  #include <openssl/engine.h>
  #include <openssl/evp.h>
  #include <openssl/ocsp.h>
  
  #define NGX_SSL_NAME     "OpenSSL"
  
  
  #define ngx_ssl_session_t       SSL_SESSION
  #define ngx_ssl_conn_t          SSL
  
  
  typedef struct {
      SSL_CTX                    *ctx;
      ngx_log_t                  *log;
      size_t                      buffer_size;
  } ngx_ssl_t;
  
  
  typedef struct {
      ngx_ssl_conn_t             *connection;
  
      ngx_int_t                   last;
      ngx_buf_t                  *buf;
      size_t                      buffer_size;
  
      ngx_connection_handler_pt   handler;
  
      ngx_event_handler_pt        saved_read_handler;
      ngx_event_handler_pt        saved_write_handler;
  
      unsigned                    handshaked:1;
      unsigned                    renegotiation:1;
      unsigned                    buffer:1;
      unsigned                    no_wait_shutdown:1;
      unsigned                    no_send_shutdown:1;
      unsigned                    handshake_buffer_set:1;
  } ngx_ssl_connection_t;
  
  
  #define NGX_SSL_NO_SCACHE            -2
  #define NGX_SSL_NONE_SCACHE          -3
  #define NGX_SSL_NO_BUILTIN_SCACHE    -4
  #define NGX_SSL_DFLT_BUILTIN_SCACHE  -5
  
  
  #define NGX_SSL_MAX_SESSION_SIZE  4096
  
  typedef struct ngx_ssl_sess_id_s  ngx_ssl_sess_id_t;
  
  struct ngx_ssl_sess_id_s {
      ngx_rbtree_node_t           node;
      u_char                     *id;
      size_t                      len;
      u_char                     *session;
      ngx_queue_t                 queue;
      time_t                      expire;
  #if (NGX_PTR_SIZE == 8)
      void                       *stub;
      u_char                      sess_id[32];
  #endif
  };
  
  
  typedef struct {
      ngx_rbtree_t                session_rbtree;
      ngx_rbtree_node_t           sentinel;
      ngx_queue_t                 expire_queue;
  } ngx_ssl_session_cache_t;
  
  
  #ifdef SSL_CTRL_SET_TLSEXT_TICKET_KEY_CB
  
  typedef struct {
      u_char                      name[16];
      u_char                      aes_key[16];
      u_char                      hmac_key[16];
  } ngx_ssl_session_ticket_key_t;
  
  #endif
  
  
  #define NGX_SSL_SSLv2    0x0002
  #define NGX_SSL_SSLv3    0x0004
  #define NGX_SSL_TLSv1    0x0008
  #define NGX_SSL_TLSv1_1  0x0010
  #define NGX_SSL_TLSv1_2  0x0020
  
  
  #define NGX_SSL_BUFFER   1
  #define NGX_SSL_CLIENT   2
  
  #define NGX_SSL_BUFSIZE  16384
  
  
  ngx_int_t ngx_ssl_init(ngx_log_t *log);
  ngx_int_t ngx_ssl_create(ngx_ssl_t *ssl, ngx_uint_t protocols, void *data);
  ngx_int_t ngx_ssl_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
      ngx_str_t *cert, ngx_str_t *key);
  ngx_int_t ngx_ssl_client_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
      ngx_str_t *cert, ngx_int_t depth);
  ngx_int_t ngx_ssl_trusted_certificate(ngx_conf_t *cf, ngx_ssl_t *ssl,
      ngx_str_t *cert, ngx_int_t depth);
  ngx_int_t ngx_ssl_crl(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *crl);
  ngx_int_t ngx_ssl_stapling(ngx_conf_t *cf, ngx_ssl_t *ssl,
      ngx_str_t *file, ngx_str_t *responder, ngx_uint_t verify);
  ngx_int_t ngx_ssl_stapling_resolver(ngx_conf_t *cf, ngx_ssl_t *ssl,
      ngx_resolver_t *resolver, ngx_msec_t resolver_timeout);
  RSA *ngx_ssl_rsa512_key_callback(ngx_ssl_conn_t *ssl_conn, int is_export,
      int key_length);
  ngx_int_t ngx_ssl_dhparam(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *file);
  ngx_int_t ngx_ssl_ecdh_curve(ngx_conf_t *cf, ngx_ssl_t *ssl, ngx_str_t *name);
  ngx_int_t ngx_ssl_session_cache(ngx_ssl_t *ssl, ngx_str_t *sess_ctx,
      ssize_t builtin_session_cache, ngx_shm_zone_t *shm_zone, time_t timeout);
  ngx_int_t ngx_ssl_session_ticket_keys(ngx_conf_t *cf, ngx_ssl_t *ssl,
      ngx_array_t *paths);
  ngx_int_t ngx_ssl_session_cache_init(ngx_shm_zone_t *shm_zone, void *data);
  ngx_int_t ngx_ssl_create_connection(ngx_ssl_t *ssl, ngx_connection_t *c,
      ngx_uint_t flags);
  
  void ngx_ssl_remove_cached_session(SSL_CTX *ssl, ngx_ssl_session_t *sess);
  ngx_int_t ngx_ssl_set_session(ngx_connection_t *c, ngx_ssl_session_t *session);
  #define ngx_ssl_get_session(c)      SSL_get1_session(c->ssl->connection)
  #define ngx_ssl_free_session        SSL_SESSION_free
  #define ngx_ssl_get_connection(ssl_conn)                                      \
      SSL_get_ex_data(ssl_conn, ngx_ssl_connection_index)
  #define ngx_ssl_get_server_conf(ssl_ctx)                                      \
      SSL_CTX_get_ex_data(ssl_ctx, ngx_ssl_server_conf_index)
  
  #define ngx_ssl_verify_error_optional(n)                                      \
      (n == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT                              \
       || n == X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN                             \
       || n == X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY                     \
       || n == X509_V_ERR_CERT_UNTRUSTED                                        \
       || n == X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE)
  
  
  ngx_int_t ngx_ssl_get_protocol(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_cipher_name(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_session_id(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_session_reused(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_raw_certificate(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_certificate(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_subject_dn(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_issuer_dn(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_serial_number(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  ngx_int_t ngx_ssl_get_client_verify(ngx_connection_t *c, ngx_pool_t *pool,
      ngx_str_t *s);
  
  
  ngx_int_t ngx_ssl_handshake(ngx_connection_t *c);
  ssize_t ngx_ssl_recv(ngx_connection_t *c, u_char *buf, size_t size);
  ssize_t ngx_ssl_write(ngx_connection_t *c, u_char *data, size_t size);
  ssize_t ngx_ssl_recv_chain(ngx_connection_t *c, ngx_chain_t *cl);
  ngx_chain_t *ngx_ssl_send_chain(ngx_connection_t *c, ngx_chain_t *in,
      off_t limit);
  void ngx_ssl_free_buffer(ngx_connection_t *c);
  ngx_int_t ngx_ssl_shutdown(ngx_connection_t *c);
  void ngx_cdecl ngx_ssl_error(ngx_uint_t level, ngx_log_t *log, ngx_err_t err,
      char *fmt, ...);
  void ngx_ssl_cleanup_ctx(void *data);
  
  
  extern int  ngx_ssl_connection_index;
  extern int  ngx_ssl_server_conf_index;
  extern int  ngx_ssl_session_cache_index;
  extern int  ngx_ssl_session_ticket_keys_index;
  extern int  ngx_ssl_certificate_index;
  extern int  ngx_ssl_stapling_index;
  
  
  #endif /* _NGX_EVENT_OPENSSL_H_INCLUDED_ */
  