/* $OpenBSD: ssh_api.h,v 1.2 2018/04/10 00:10:49 djm Exp $ */
/*
* Copyright (c) 2012 Markus Friedl. All rights reserved.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#ifndef API_H
#define API_H
#include <sys/types.h>
#include <signal.h>
#include "openbsd-compat/sys-queue.h"
#include "cipher.h"
#include "sshkey.h"
#include "kex.h"
#include "ssh.h"
#include "ssh2.h"
#include "packet.h"
struct kex_params {
char *proposal[PROPOSAL_MAX];
};
/* public SSH API functions */
/*
* ssh_init() create a ssh connection object with given (optional)
* key exchange parameters.
*/
int ssh_init(struct ssh **, int is_server, struct kex_params *kex_params);
/*
* release ssh connection state.
*/
void ssh_free(struct ssh *);
/*
* attach application specific data to the connection state
*/
void ssh_set_app_data(struct ssh *, void *);
void *ssh_get_app_data(struct ssh *);
/*
* ssh_add_hostkey() registers a private/public hostkey for an ssh
* connection.
* ssh_add_hostkey() needs to be called before a key exchange is
* initiated with ssh_packet_next().
* private hostkeys are required if we need to act as a server.
* public hostkeys are used to verify the servers hostkey.
*/
int ssh_add_hostkey(struct ssh *ssh, struct sshkey *key);
/*
* ssh_set_verify_host_key_callback() registers a callback function
* which should be called instead of the default verification. The
* function given must return 0 if the hostkey is ok, -1 if the
* verification has failed.
*/
int ssh_set_verify_host_key_callback(struct ssh *ssh,
int (*cb)(struct sshkey *, struct ssh *));
/*
* ssh_packet_next() advances to the next input packet and returns
* the packet type in typep.
* ssh_packet_next() works by processing an input byte-stream,
* decrypting the received data and hiding the key-exchange from
* the caller.
* ssh_packet_next() sets typep if there is no new packet available.
* in this case the caller must fill the input byte-stream by passing
* the data received over network to ssh_input_append().
* additionally, the caller needs to send the resulting output
* byte-stream back over the network. otherwise the key exchange
* would not proceed. the output byte-stream is accessed through
* ssh_output_ptr().
*/
int ssh_packet_next(struct ssh *ssh, u_char *typep);
/*
* ssh_packet_payload() returns a pointer to the raw payload data of
* the current input packet and the length of this payload.
* the payload is accessible until ssh_packet_next() is called again.
*/
const u_char *ssh_packet_payload(struct ssh *ssh, size_t *lenp);
/*
* ssh_packet_put() creates an encrypted packet with the given type
* and payload.
* the encrypted packet is appended to the output byte-stream.
*/
int ssh_packet_put(struct ssh *ssh, int type, const u_char *data,
size_t len);
/*
* ssh_input_space() checks if 'len' bytes can be appended to the
* input byte-stream.
*/
int ssh_input_space(struct ssh *ssh, size_t len);
/*
* ssh_input_append() appends data to the input byte-stream.
*/
int ssh_input_append(struct ssh *ssh, const u_char *data, size_t len);
/*
* ssh_output_space() checks if 'len' bytes can be appended to the
* output byte-stream. XXX
*/
int ssh_output_space(struct ssh *ssh, size_t len);
/*
* ssh_output_ptr() retrieves both a pointer and the length of the
* current output byte-stream. the bytes need to be sent over the
* network. the number of bytes that have been successfully sent can
* be removed from the output byte-stream with ssh_output_consume().
*/
const u_char *ssh_output_ptr(struct ssh *ssh, size_t *len);
/*
* ssh_output_consume() removes the given number of bytes from
* the output byte-stream.
*/
int ssh_output_consume(struct ssh *ssh, size_t len);
#endif
