2022-02-14 12:13:30 +03:00
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/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2022, all xrdp contributors
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/**
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*
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* @file libipm/scp.h
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* @brief scp declarations
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* @author Simone Fedele/ Matt Burt
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*
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* Functions in this file use the following naming conventions:-
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*
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* E_SCP_<msg>_REQUEST is sent by scp_send_<msg>_request()
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* E_SCP_<msg>_REQUEST is parsed by scp_get_<msg>_request()
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* E_SCP_<msg>_RESPONSE is sent by scp_send_<msg>_response()
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* E_SCP_<msg>_RESPONSE is parsed by scp_get_<msg>_response()
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*/
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#ifndef SCP_H
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#define SCP_H
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#include "arch.h"
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struct guid;
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struct trans;
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#include "scp_application_types.h"
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/* Message codes */
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enum scp_msg_code
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{
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E_SCP_GATEWAY_REQUEST = 1,
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E_SCP_GATEWAY_RESPONSE,
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E_SCP_CREATE_SESSION_REQUEST,
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E_SCP_CREATE_SESSION_RESPONSE,
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E_SCP_LIST_SESSIONS_REQUEST,
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E_SCP_LIST_SESSIONS_RESPONSE
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};
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/* Common facilities */
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/**
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* Convert a message code to a string for output
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* @param n Message code
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* @param buff to contain string
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* @param buff_size length of buff
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* @return buff is returned for convenience.
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*/
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const char *
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scp_msgno_to_str(enum scp_msg_code n, char *buff, unsigned int buff_size);
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/* Connection management facilities */
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2022-03-19 14:29:28 +03:00
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/**
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* Maps a port definition to a UNIX domain socket path
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* @param port Port definition (e.g. from sesman.ini). Can be "" or NULL
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* @param buff Buffer for result
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* @param bufflen Length of buff
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*
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* @return Number of chars needed for result, excluding the '\0'
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*/
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int
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scp_port_to_unix_domain_path(const char *port, char *buff,
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unsigned int bufflen);
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/**
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* Maps a port definition to a displayable string
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* @param port Port definition (e.g. from sesman.ini). Can be "" or NULL
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* @param buff Buffer for result
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* @param bufflen Length of buff
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*
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* @return Number of chars needed for result, excluding the '\0'
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*
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* This differs from scp_port_to_unix_domain_path() in that the result is
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* for displaying to the user (i.e. in a status message), rather than for
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* connecting to. For log messages, use the result of
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* scp_port_to_unix_domain_path()
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*/
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int
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scp_port_to_display_string(const char *port, char *buff, unsigned int bufflen);
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2022-02-14 12:13:30 +03:00
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/**
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* Connect to an SCP server
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*
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2022-03-19 14:29:28 +03:00
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* @param port Port definition (e.g. from sesman.ini)
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2022-02-14 12:13:30 +03:00
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* @param term_func Function to poll during connection for program
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* termination, or NULL for none.
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* @return Initialised SCP transport
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*
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2022-09-03 02:48:01 +03:00
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* The returned transport has the is_term member set to term_func.
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2022-02-14 12:13:30 +03:00
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*/
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struct trans *
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2022-03-19 14:29:28 +03:00
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scp_connect(const char *port,
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2022-02-14 12:13:30 +03:00
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int (*term_func)(void));
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/**
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* Converts a standard trans connected to an SCP endpoint to an SCP transport
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*
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* @param trans connected endpoint
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* @return != 0 for error
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*
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2022-09-03 02:48:01 +03:00
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* The returned transport has the is_term member set to term_func.
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2022-02-14 12:13:30 +03:00
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*/
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int
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scp_init_trans(struct trans *trans);
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/**
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* Checks an SCP transport to see if a complete message is
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* available for parsing
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*
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* @param trans SCP transport
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* @param[out] available != 0 if a complete message is available
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* @return != 0 for error
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*/
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int
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scp_msg_in_check_available(struct trans *trans, int *available);
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/**
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* Waits on a single transport for an SCP message to be available for
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* parsing
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*
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* @param trans libipm transport
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* @return != 0 for error
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*
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* While the call is active, data-in callbacks for the transport are
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* disabled.
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*
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* Only use this call if you have nothing to do until a message
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* arrives on the transport. If you have other transports to service, use
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* scp_msg_in_check_available()
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*/
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int
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scp_msg_in_wait_available(struct trans *trans);
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/**
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* Start parsing an SCP message
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*
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* @param trans SCP transport
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* @return message in the buffer
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*
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* The results of calling this routine before scp_msg_in_check_available()
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* states a message is available are undefined.
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*
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* Calling this function rests the message parsing pointer to the start
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* of the message
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*/
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enum scp_msg_code
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scp_msg_in_start(struct trans *trans);
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/**
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* Resets an SCP message buffer ready to receive the next message
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*
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* @param trans libipm transport
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*/
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void
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scp_msg_in_reset(struct trans *trans);
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/**
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* Send an E_SCP_GATEWAY_REQUEST (SCP client)
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*
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* @param trans SCP transport
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* @param username Username
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* @param password Password
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2022-04-22 13:56:23 +03:00
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* @param ip_addr IP address for the client (or "" if not known)
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2022-02-14 12:13:30 +03:00
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* @return != 0 for error
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*
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* Server replies with E_SCP_GATEWAY_RESPONSE
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*/
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int
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scp_send_gateway_request(struct trans *trans,
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const char *username,
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2022-03-01 19:02:37 +03:00
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const char *password,
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2022-04-22 13:56:23 +03:00
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const char *ip_addr);
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2022-02-14 12:13:30 +03:00
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/**
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* Parse an incoming E_SCP_GATEWAY_REQUEST message (SCP server)
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*
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* @param trans SCP transport
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* @param[out] username Username
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* @param[out] password Password
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2022-04-22 13:56:23 +03:00
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* @param[out] ip_addr IP address for the client. May be ""
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2022-02-14 12:13:30 +03:00
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* @return != 0 for error
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*/
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int
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scp_get_gateway_request(struct trans *trans,
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const char **username,
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2022-03-01 19:02:37 +03:00
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const char **password,
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2022-04-22 13:56:23 +03:00
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const char **ip_addr);
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2022-02-14 12:13:30 +03:00
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/**
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* Send an E_SCP_GATEWAY_RESPONSE (SCP server)
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*
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* @param trans SCP transport
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* @param auth_result 0 for success, PAM error code otherwise
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* @return != 0 for error
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*/
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int
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scp_send_gateway_response(struct trans *trans,
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int auth_result);
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/**
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* Parses an incoming E_SCP_GATEWAY_RESPONSE (SCP client)
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*
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* @param trans SCP transport
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* @param[out] auth_result 0 for success, PAM error code otherwise
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* @return != 0 for error
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*/
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int
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scp_get_gateway_response(struct trans *trans,
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int *auth_result);
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/* Session messages */
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/**
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* Send an E_SCP_CREATE_SESSION_REQUEST (SCP client)
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*
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* @param trans SCP transport
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* @param username Username of session to create or re-connect to
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* @param password Password for user
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* @param type Session type
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* @param width Initial session width
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* @param height Initial session height
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* @param bpp Session bits-per-pixel (ignored for Xorg sessions)
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* @param shell User program to run. May be ""
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* @param directory Directory to run the program in. May be ""
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2022-04-22 13:56:23 +03:00
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* @param ip_addr IP address for the client (or "" if not known)
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2022-02-14 12:13:30 +03:00
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* @return != 0 for error
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*
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* Server replies with E_SCP_CREATE_SESSION_RESPONSE
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*/
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int
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scp_send_create_session_request(struct trans *trans,
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const char *username,
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const char *password,
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enum scp_session_type type,
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unsigned short width,
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unsigned short height,
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unsigned char bpp,
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const char *shell,
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const char *directory,
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2022-04-22 13:56:23 +03:00
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const char *ip_addr);
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2022-02-14 12:13:30 +03:00
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/**
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* Parse an incoming E_SCP_CREATE_SESSION_REQUEST (SCP server)
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*
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* @param trans SCP transport
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* @param[out] username Username of session to create or re-connect to
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* @param[out] password Password for user
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* @param[out] type Session type
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* @param[out] width Initial session width
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* @param[out] height Initial session height
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* @param[out] bpp Session bits-per-pixel (ignored for Xorg sessions)
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* @param[out] shell User program to run. May be ""
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* @param[out] directory Directory to run the program in. May be ""
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2022-04-22 13:56:23 +03:00
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* @param[out] ip_addr IP address for the client. May be ""
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2022-02-14 12:13:30 +03:00
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* @return != 0 for error
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*
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* Returned string pointers are valid until scp_msg_in_reset() is
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* called for the transport
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*/
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int
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scp_get_create_session_request(struct trans *trans,
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const char **username,
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const char **password,
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enum scp_session_type *type,
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unsigned short *width,
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unsigned short *height,
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unsigned char *bpp,
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const char **shell,
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const char **directory,
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2022-04-22 13:56:23 +03:00
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const char **ip_addr);
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2022-02-14 12:13:30 +03:00
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/**
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* Send an E_SCP_CREATE_SESSION_RESPONSE (SCP server)
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*
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* @param trans SCP transport
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* @param auth_result 0 for success, PAM error code otherwise
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* @param display Should be zero if authentication failed.
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* @param guid Guid for session. Should be all zeros if authentication failed
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*
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* @return != 0 for error
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*/
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int
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scp_send_create_session_response(struct trans *trans,
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int auth_result,
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int display,
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const struct guid *guid);
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/**
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* Parse an incoming E_SCP_CREATE_SESSION_RESPONSE (SCP client)
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*
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* @param trans SCP transport
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* @param[out] auth_result 0 for success, PAM error code otherwise
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* @param[out] display Should be zero if authentication failed.
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* @param[out] guid Guid for session. Should be all zeros if authentication
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* failed
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*
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* @return != 0 for error
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*/
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int
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scp_get_create_session_response(struct trans *trans,
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int *auth_result,
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int *display,
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struct guid *guid);
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/**
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* Status of an E_SCP_LIST_SESSIONS_RESPONSE message
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*/
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enum scp_list_sessions_status
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{
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/**
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* This message contains a valid session, and other messages
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* will be sent
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*/
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E_SCP_LS_SESSION_INFO = 0,
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/**
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* This message indicates the end of a list of sessions. No session
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* is contained in the message */
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E_SCP_LS_END_OF_LIST,
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/**
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* Authentication failed for the user
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*/
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E_SCP_LS_AUTHENTICATION_FAIL = 100,
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/**
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* A client-side error occurred allocating memory for the session
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*/
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E_SCP_LS_NO_MEMORY
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};
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/**
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* Send an E_LIST_SESSIONS_REQUEST (SCP client)
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*
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* @param trans SCP transport
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* @param username Username
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* @param password Password
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* @return != 0 for error
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*
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* Server replies with one or more E_SCP_LIST_SESSIONS_RESPONSE
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*/
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int
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scp_send_list_sessions_request(struct trans *trans,
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const char *username,
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const char *password);
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/**
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* Parse an incoming E_LIST_SESSIONS_REQUEST (SCP server)
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*
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* @param trans SCP transport
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* @param[out] username Username
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* @param[out] password Password
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* @return != 0 for error
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*/
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int
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scp_get_list_sessions_request(struct trans *trans,
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const char **username,
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const char **password);
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/**
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* Send an E_LIST_SESSIONS_RESPONSE (SCP server)
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*
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* @param trans SCP transport
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* @param status Status of request
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* @param info Session to send if status == E_SCL_LS_SESSION_INFO
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* @return != 0 for error
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*/
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int
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scp_send_list_sessions_response(
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struct trans *trans,
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enum scp_list_sessions_status status,
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const struct scp_session_info *info);
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/**
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* Parse an incoming E_LIST_SESSIONS_RESPONSE (SCP client)
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*
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* @param trans SCP transport
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|
* @param[out] status Status of request
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* @param[out] info Session if status == E_SCL_LS_SESSION_INFO
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* @return != 0 for error
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*
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* The session info is returned as a dynamically allocated structure.
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* After use the structure (and its members) can be de-allocated with
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* a single call to g_free()
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*
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* The info structures can be added to a 'struct list' with auto_free set.
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* When the list is de-allocated, all the structures will be de-allocated too.
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|
|
|
*/
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|
int
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|
|
|
scp_get_list_sessions_response(
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|
|
|
struct trans *trans,
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|
|
|
enum scp_list_sessions_status *status,
|
|
|
|
struct scp_session_info **info);
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|
|
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|
#endif /* SCP_H */
|