#ifndef IOSTREAM_SSL_H
#define IOSTREAM_SSL_H

struct ssl_iostream;
struct ssl_iostream_context;

struct ssl_iostream_settings {
	const char *protocols;
	const char *cipher_list;
	const char *ca, *ca_file, *ca_dir; /* context-only */
	const char *cert;
	const char *key;
	const char *key_password;
	const char *cert_username_field;
	const char *crypto_device; /* context-only */

	bool verbose, verbose_invalid_cert; /* stream-only */
	bool verify_remote_cert; /* neither/both */
	bool require_valid_cert; /* stream-only */
	bool prefer_server_ciphers;
	bool compression;
	bool tickets;
};

/* Returns 0 if ok, -1 and sets error_r if failed. The returned error string
   becomes available via ssl_iostream_get_last_error(). The callback most
   likely should be calling ssl_iostream_check_cert_validity(). */
typedef int
ssl_iostream_handshake_callback_t(const char **error_r, void *context);

int io_stream_create_ssl_client(struct ssl_iostream_context *ctx, const char *host,
				const struct ssl_iostream_settings *set,
				struct istream **input, struct ostream **output,
				struct ssl_iostream **iostream_r,
				const char **error_r);
int io_stream_create_ssl_server(struct ssl_iostream_context *ctx,
				const struct ssl_iostream_settings *set,
				struct istream **input, struct ostream **output,
				struct ssl_iostream **iostream_r,
				const char **error_r);
/* returned input and output streams must also be unreferenced */
void ssl_iostream_unref(struct ssl_iostream **ssl_io);
/* shutdown SSL connection and unreference ssl iostream */
void ssl_iostream_destroy(struct ssl_iostream **ssl_io);

/* If verbose logging is enabled, use the specified log prefix */
void ssl_iostream_set_log_prefix(struct ssl_iostream *ssl_io,
				 const char *prefix);

int ssl_iostream_handshake(struct ssl_iostream *ssl_io);
/* Call the given callback when SSL handshake finishes. The callback must
   verify whether the certificate and its hostname is valid. If there is no
   callback, the default is to use ssl_iostream_check_cert_validity() with the
   same host as given to io_stream_create_ssl_client() */
void ssl_iostream_set_handshake_callback(struct ssl_iostream *ssl_io,
					 ssl_iostream_handshake_callback_t *callback,
					 void *context);

bool ssl_iostream_is_handshaked(const struct ssl_iostream *ssl_io);
/* Returns TRUE if the remote cert is invalid, or handshake callback returned
   failure. */
bool ssl_iostream_has_handshake_failed(const struct ssl_iostream *ssl_io);
bool ssl_iostream_has_valid_client_cert(const struct ssl_iostream *ssl_io);
bool ssl_iostream_has_broken_client_cert(struct ssl_iostream *ssl_io);
int ssl_iostream_check_cert_validity(struct ssl_iostream *ssl_io,
				     const char *host, const char **error_r);
int ssl_iostream_cert_match_name(struct ssl_iostream *ssl_io, const char *name);
const char *ssl_iostream_get_peer_name(struct ssl_iostream *ssl_io);
const char *ssl_iostream_get_server_name(struct ssl_iostream *ssl_io);
const char *ssl_iostream_get_security_string(struct ssl_iostream *ssl_io);
const char *ssl_iostream_get_last_error(struct ssl_iostream *ssl_io);

int ssl_iostream_generate_params(buffer_t *output, unsigned int dh_length,
				 const char **error_r);
int ssl_iostream_context_import_params(struct ssl_iostream_context *ctx,
				       const buffer_t *input);

int ssl_iostream_context_init_client(const struct ssl_iostream_settings *set,
				     struct ssl_iostream_context **ctx_r,
				     const char **error_r);
int ssl_iostream_context_init_server(const struct ssl_iostream_settings *set,
				     struct ssl_iostream_context **ctx_r,
				     const char **error_r);
void ssl_iostream_context_deinit(struct ssl_iostream_context **ctx);

#endif
