/*
 * This file is part of the SSH Library
 *
 * Copyright (c) 2003-2008 by Aris Adamantiadis
 *
 * The SSH Library is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation; either version 2.1 of the License, or (at your
 * option) any later version.
 *
 * The SSH Library is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
 * License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with the SSH Library; see the file COPYING.  If not, write to
 * the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
 * MA 02111-1307, USA.
 */

/**
 * @defgroup ssh_server SSH Server
 * @addtogroup ssh_server
 * @{
 */

#ifndef SERVER_H
#define SERVER_H

#include "libssh/libssh.h"
#define SERVERBANNER CLIENTBANNER

#ifdef __cplusplus
extern "C" {
#endif

typedef struct ssh_bind_struct SSH_BIND;

/**
 * @brief Creates a new SSH server bind.
 *
 * @return A newly allocated ssh_bind session pointer.
 */
SSH_BIND *ssh_bind_new(void);

/**
 * @brief Set the opitons for the current SSH server bind.
 *
 * @param  ssh_bind     The ssh server bind to use.
 *
 * @param  options      The option structure to set.
 */
void ssh_bind_set_options(SSH_BIND *ssh_bind, SSH_OPTIONS *options);

/**
 * @brief Start listening to the socket.
 *
 * @param  ssh_bind     The ssh server bind to use.
 *
 * @return 0 on success, < 0 on error.
 */
int ssh_bind_listen(SSH_BIND *ssh_bind);

/**
 * @brief  Set the session to blocking/nonblocking mode.
 *
 * @param  ssh_bind     The ssh server bind to use.
 *
 * @param  blocking     Zero for nonblocking mode.
 */
void ssh_bind_set_blocking(SSH_BIND *ssh_bind, int blocking);

/**
 * @brief Recover the file descriptor from the session.
 *
 * @param  ssh_bind     The ssh server bind to get the fd from.
 *
 * @return The file descriptor.
 */
socket_t ssh_bind_get_fd(SSH_BIND *ssh_bind);

/**
 * @brief Set the file descriptor for a session.
 *
 * @param  ssh_bind     The ssh server bind to set the fd.
 *
 * @param  fd           The file descriptor.
 */
void ssh_bind_set_fd(SSH_BIND *ssh_bind, socket_t fd);

/**
 * @brief Allow the file descriptor to accept new sessions.
 *
 * @param  ssh_bind     The ssh server bind to use.
 */
void ssh_bind_fd_toaccept(SSH_BIND *ssh_bind);

/**
 * @brief Accept an incoming ssh connection and initialize the session.
 *
 * @param  ssh_bind     The ssh server bind to accept a connection.
 *
 * @return A newly allocated ssh session, NULL on error.
 */
SSH_SESSION *ssh_bind_accept(SSH_BIND *ssh_bind);

/**
 * @brief Free a ssh servers bind.
 *
 * @param  ssh_bind     The ssh server bind to free.
 */
void ssh_bind_free(SSH_BIND *ssh_bind);

/**
 * @brief Exchange the banner and cryptographic keys.
 *
 * @param  session      The ssh session to accept a connection.
 *
 * @return 0 on success, < 0 on error.
 */
int ssh_accept(SSH_SESSION *session);

/* messages.c */

#define SSH_AUTH_REQUEST 1
#define SSH_CHANNEL_REQUEST_OPEN 2
#define SSH_CHANNEL_REQUEST 3
#define SSH_SERVICE_REQUEST 4

#define SSH_AUTH_NONE (1<<0)
#define SSH_AUTH_PASSWORD (1<<1)
#define SSH_AUTH_HOSTBASED (1<<2)
#define SSH_AUTH_PUBLICKEY (1<<3)
#define SSH_AUTH_KEYBINT (1<<4)
#define SSH_AUTH_UNKNOWN 0

#define SSH_CHANNEL_SESSION 1
#define SSH_CHANNEL_TCPIP 2
#define SSH_CHANNEL_X11 3
#define SSH_CHANNEL_UNKNOWN 4

#define SSH_CHANNEL_REQUEST_PTY 1
#define SSH_CHANNEL_REQUEST_EXEC 2
#define SSH_CHANNEL_REQUEST_SHELL 3
#define SSH_CHANNEL_REQUEST_ENV 4
#define SSH_CHANNEL_REQUEST_SUBSYSTEM 5
#define SSH_CHANNEL_REQUEST_WINDOW_CHANGE 6
#define SSH_CHANNEL_REQUEST_UNKNOWN 7

typedef struct ssh_message SSH_MESSAGE;

SSH_MESSAGE *ssh_message_retrieve(SSH_SESSION *session, uint32_t packettype);
SSH_MESSAGE *ssh_message_get(SSH_SESSION *session);
int ssh_message_type(SSH_MESSAGE *msg);
int ssh_message_subtype(SSH_MESSAGE *msg);
int ssh_message_reply_default(SSH_MESSAGE *msg);
void ssh_message_free(SSH_MESSAGE *msg);

char *ssh_message_auth_user(SSH_MESSAGE *msg);
char *ssh_message_auth_password(SSH_MESSAGE *msg);
int ssh_message_auth_reply_success(SSH_MESSAGE *msg,int partial);
int ssh_message_auth_set_methods(SSH_MESSAGE *msg, int methods);

ssh_channel ssh_message_channel_request_open_reply_accept(SSH_MESSAGE *msg);

ssh_channel ssh_message_channel_request_channel(SSH_MESSAGE *msg);
// returns the TERM env variable
char *ssh_message_channel_request_pty_term(SSH_MESSAGE *msg);
char *ssh_message_channel_request_subsystem(SSH_MESSAGE *msg);
int ssh_message_channel_request_reply_success(SSH_MESSAGE *msg);

int ssh_message_service_reply_success(SSH_MESSAGE *msg);
char *ssh_message_service_service(SSH_MESSAGE *msg);

void ssh_set_message_callback(SSH_SESSION *session,
    int(*ssh_message_callback)(ssh_session session, struct ssh_message *msg));
#ifdef __cplusplus
}
#endif /* __cplusplus */

#endif /* SERVER_H */

/**
 * @}
 */
/* vim: set ts=2 sw=2 et cindent: */