mirror of https://github.com/neutrinolabs/xrdp
237 lines
6.7 KiB
C
237 lines
6.7 KiB
C
/**
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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/ercp.h
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* @brief ERCP declarations
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* @author 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_ERCP_{msg}_REQUEST is sent by ercp_send_{msg}_request()
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* E_ERCP_{msg}_REQUEST is parsed by ercp_get_{msg}_request()
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* E_ERCP_{msg}_RESPONSE is sent by ercp_send_{msg}_response()
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* E_ERCP_{msg}_RESPONSE is parsed by ercp_get_{msg}_response()
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* E_ERCP_{msg}_EVENT is sent by ercp_send_{msg}_event()
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* E_ERCP_{msg}_EVENT is parsed by ercp_get_{msg}_event()
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*/
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#ifndef ERCP_H
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#define ERCP_H
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#include "arch.h"
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#include "scp_application_types.h"
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#include "trans.h"
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struct guid;
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/* Message codes */
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enum ercp_msg_code
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{
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E_ERCP_SESSION_ANNOUNCE_EVENT,
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E_ERCP_SESSION_FINISHED_EVENT,
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E_ERCP_SESSION_RECONNECT_EVENT
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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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ercp_msgno_to_str(enum ercp_msg_code n, char *buff, unsigned int buff_size);
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/* Connection management facilities */
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/**
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* Converts a standard trans connected to an ERCP endpoint to an ERCP 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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int
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ercp_init_trans(struct trans *trans);
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/**
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* Converts an EICP transport to an ERCP transport.
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*
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* This is done following successful transmission or receipt of an
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* E_EICP_CREATE_SESSION_REQUEST.
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*
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* @param trans connected endpoint
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* @param callback_func New callback function for ERCP messages.
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* @param callback_data New argument for callback function
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*/
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void
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ercp_trans_from_eicp_trans(struct trans *trans,
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ttrans_data_in callback_func,
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void *callback_data);
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/**
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* Checks an ERCP 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 ERCP 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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ercp_msg_in_check_available(struct trans *trans, int *available);
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/**
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* Waits on a single transport for an ERCP 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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* ercp_msg_in_check_available()
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*/
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int
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ercp_msg_in_wait_available(struct trans *trans);
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/**
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* Gets the ERCP message number of an incoming message
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*
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* @param trans ERCP 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 ercp_msg_in_check_available()
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* states a message is available are undefined.
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*/
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enum ercp_msg_code
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ercp_msg_in_get_msgno(const struct trans *trans);
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/**
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* Resets an ERCP 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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ercp_msg_in_reset(struct trans *trans);
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/* -------------------- Session event messages-------------------- */
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/**
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* Send an E_ERCP_SESSION_ANNOUNCE_EVENT
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*
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* Direction : sesexec -> sesman
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*
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* This event contains all the information known about a session
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*
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* @param trans EICP transport
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* @param display Display used by session
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* @param uid UID of user logged in to session
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* @param type Session type
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* @param start_width Starting width of seenio
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* @param start_height Starting height of session
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* @param bpp Bits-per-pixel for session
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* @param guid Session GUID
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* @param start_ip_addr Starting IP address of client
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* @param start_time Session start time
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* @return != 0 for error
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*/
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int
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ercp_send_session_announce_event(struct trans *trans,
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unsigned int display,
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uid_t uid,
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enum scp_session_type type,
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unsigned short start_width,
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unsigned short start_height,
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unsigned char bpp,
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const struct guid *guid,
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const char *start_ip_addr,
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time_t start_time);
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/**
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* Parse an incoming E_ERCP_SESSION_ANNOUNCE_EVENT
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*
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* This event contains all the information known about a session
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*
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* @param trans EICP transport
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* @param[out] display Display used by session.
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* Pointer can be NULL if this is already known.
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* @param[out] uid UID of user logged in to session
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* @param[out] type Session type
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* @param[out] start_width Starting width of seenio
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* @param[out] start_height Starting height of session
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* @param[out] bpp Bits-per-pixel for session
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* @param[out] guid Session GUID
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* @param[out] start_ip_addr Starting IP address of client
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* @param[out] start_time Session start time
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* @return != 0 for error
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*/
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int
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ercp_get_session_announce_event(struct trans *trans,
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unsigned int *display,
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uid_t *uid,
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enum scp_session_type *type,
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unsigned short *start_width,
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unsigned short *start_height,
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unsigned char *bpp,
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struct guid *guid,
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const char **start_ip_addr,
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time_t *start_time);
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/**
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* Send an E_ERCP_SESSION_FINISHED_EVENT
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*
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* Direction : sesexec -> sesman
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*
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* This event simply states the attached session has finished and can be
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* removed from any data structures held by sesman
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*
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* @param trans EICP transport
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* @return != 0 for error
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*/
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int
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ercp_send_session_finished_event(struct trans *trans);
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/**
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* Send an E_ERCP_SESSION_RECONNECT_EVENT
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*
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* Direction : sesman -> sesexec
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*
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* This event tells sesexec that a reconnection is about to occur, and
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* sesexec should run the reconnect script.
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*
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* @param trans EICP transport
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* @return != 0 for error
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*/
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int
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ercp_send_session_reconnect_event(struct trans *trans);
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#endif /* ERCP_H */
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