/*

 * This file is part of the SSH Library

 *

 * Copyright (c) 2018 by Red Hat, Inc.

 *

 * Author: Anderson Toshiyuki Sasaki <ansasaki@redhat.com>

 *

 * 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.

 */

#include "config.h"

#include <libssh/libssh.h>

#include <libssh/callbacks.h>

#define SSHD_DEFAULT_USER "libssh"

#define SSHD_DEFAULT_PASSWORD "libssh"

#define SSHD_DEFAULT_PORT 2222

#define SSHD_DEFAULT_ADDRESS "127.0.0.1"

#define SSHD_DEFAULT_PCAP_FILE "debug.server.pcap"

#ifndef KEYS_FOLDER

#ifdef _WIN32

#define KEYS_FOLDER

#else

#define KEYS_FOLDER "/etc/ssh/"

#endif

#endif

#define BUF_SIZE 1048576

#define SESSION_END (SSH_CLOSED | SSH_CLOSED_ERROR)

#define SFTP_SERVER_PATH "/usr/lib/sftp-server"

#ifdef HAVE_PTY_H

#include <pty.h>

#endif

/* A userdata struct for channel. */

struct channel_data_st {

    /* pid of the child process the channel will spawn. */

    pid_t pid;

    /* For PTY allocation */

    socket_t pty_master;

    socket_t pty_slave;

    /* For communication with the child process. */

    socket_t child_stdin;

    socket_t child_stdout;

    /* Only used for subsystem and exec requests. */

    socket_t child_stderr;

    /* Event which is used to poll the above descriptors. */

    ssh_event event;

    /* Terminal size struct. */

    struct winsize *winsize;

    /* This pointer will hold the server state for default callbacks */

    void *server_state;

    /* This pointer is useful to set data for custom callbacks */

    void *extra_data;

};

/* A userdata struct for session. */

struct session_data_st {

    /* Pointer to the channel the session will allocate. */

    ssh_channel channel;

    int auth_attempts;

    int authenticated;

    const char *username;

    const char *password;

#ifdef WITH_PCAP

    ssh_pcap_file pcap;

#endif

    /* This pointer will hold the server state for default callbacks */

    void *server_state;

    /* This pointer is useful to set data for custom callbacks */

    void *extra_data;

};

int auth_password_cb(ssh_session session, const char *user,

        const char *password, void *userdata);

#if WITH_GSSAPI

int auth_gssapi_mic_cb(ssh_session session, const char *user,

        const char *principal, void *userdata);

#endif

int channel_data_cb(ssh_session session, ssh_channel channel,

        void *data, uint32_t len, int is_stderr, void *userdata);

void channel_eof_cb(ssh_session session, ssh_channel channel,

        void *userdata);

void channel_close_cb(ssh_session session, ssh_channel channel,

        void *userdata);

void channel_signal_cb (ssh_session session,

        ssh_channel channel,

        const char *signal,

        void *userdata);

void channel_exit_status_cb (ssh_session session,

        ssh_channel channel,

        int exit_status,

        void *userdata);

void channel_exit_signal_cb(ssh_session session,

        ssh_channel channel,

        const char *signal,

        int core,

        const char *errmsg,

        const char *lang,

        void *userdata);

int channel_pty_request_cb(ssh_session session, ssh_channel channel,

        const char *term, int cols, int rows, int py, int px, void *userdata);

int channel_pty_resize_cb(ssh_session session, ssh_channel channel,

        int cols, int rows, int py, int px, void *userdata);

int channel_shell_request_cb(ssh_session session, ssh_channel channel,

        void *userdata);

void channel_auth_agent_req_callback(ssh_session session,

        ssh_channel channel, void *userdata);

void channel_x11_req_callback(ssh_session session,

        ssh_channel channel,

        int single_connection,

        const char *auth_protocol,

        const char *auth_cookie,

        uint32_t screen_number,

        void *userdata);

int channel_exec_request_cb(ssh_session session,

        ssh_channel channel,

        const char *command,

        void *userdata);

int channel_env_request_cb(ssh_session session,

        ssh_channel channel, const char *env_name, const char *env_value,

        void *userdata);

int channel_subsystem_request_cb(ssh_session session,

        ssh_channel channel, const char *subsystem,

        void *userdata);

int channel_write_wontblock_cb(ssh_session session,

        ssh_channel channel,

        size_t bytes,

        void *userdata);

ssh_channel channel_new_session_cb(ssh_session session, void *userdata);

/* The caller is responsible to set the userdata to be provided to the callback

 * The caller is responsible to free the allocated structure

 * */

struct ssh_server_callbacks_struct *get_default_server_cb(void);

/* The caller is responsible to set the userdata to be provided to the callback

 * The caller is responsible to free the allocated structure

 * */

struct ssh_channel_callbacks_struct *get_default_channel_cb(void);

void default_handle_session_cb(ssh_event event, ssh_session session,

        struct server_state_st *state);