matt335672
c4727ad8f3
As far as possible, use of the X11 display number is kept to X11-specific routines. This is to make it easier to restructure the code to add non-X11 display support.
265 lines
8.1 KiB
C
265 lines
8.1 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2023
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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 eicp_server.c
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* @brief eicp (executive initialisation control protocol) server function
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* @author Matt Burt
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*
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*/
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#if defined(HAVE_CONFIG_H)
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#include <config_ac.h>
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#endif
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#include "trans.h"
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#include "eicp.h"
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#include "eicp_server.h"
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#include "login_info.h"
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#include "os_calls.h"
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#include "ercp.h"
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#include "scp.h"
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#include "sesexec.h"
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#include "sesexec_discover.h"
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#include "session.h"
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/******************************************************************************/
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static int
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handle_sys_login_request(struct trans *self)
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{
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const char *username;
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const char *password;
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const char *ip_addr;
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int scp_fd;
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int rv = eicp_get_sys_login_request(self, &username,
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&password, &ip_addr, &scp_fd);
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if (rv == 0)
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{
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struct trans *scp_trans;
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scp_trans = scp_init_trans_from_fd(scp_fd, TRANS_TYPE_SERVER,
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sesexec_is_term);
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if (scp_trans == NULL)
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{
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LOG(LOG_LEVEL_ERROR, "Can't create SCP trans");
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g_file_close(scp_fd);
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rv = 1;
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}
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else
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{
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if (g_login_info != NULL)
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{
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// Shouldn't get here. Prevent a memory leak.
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LOG(LOG_LEVEL_WARNING,
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"Asked to sys login when a login has already been made");
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login_info_free(g_login_info);
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}
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g_login_info = login_info_sys_login_user(scp_trans, username,
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password, ip_addr);
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if (g_login_info != NULL)
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{
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rv = eicp_send_sys_login_response(self, 1,
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g_login_info->uid, scp_fd);
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}
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else
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{
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rv = eicp_send_sys_login_response(self, 0, (uid_t) -1, 0);
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}
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trans_delete(scp_trans); // Closes scp_fd as well
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}
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}
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return rv;
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}
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/******************************************************************************/
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static int
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handle_uds_login_request(struct trans *self)
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{
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int scp_fd;
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int rv = eicp_get_uds_login_request(self, &scp_fd);
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if (rv == 0)
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{
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struct trans *scp_trans;
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scp_trans = scp_init_trans_from_fd(scp_fd, TRANS_TYPE_SERVER,
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sesexec_is_term);
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if (scp_trans == NULL)
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{
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LOG(LOG_LEVEL_ERROR, "Can't create SCP trans");
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g_file_close(scp_fd);
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rv = 1;
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}
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else
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{
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if (g_login_info != NULL)
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{
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// Shouldn't get here. Prevent a memory leak.
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LOG(LOG_LEVEL_WARNING,
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"Asked to UDS login when a login has already been made");
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login_info_free(g_login_info);
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}
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// The following call logs errors, but these are not
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// returned to the caller, as the call is expected to succeed.
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if ((g_login_info = login_info_uds_login_user(scp_trans)) == NULL)
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{
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rv = 1;
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}
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trans_delete(scp_trans);
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}
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}
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return rv;
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}
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/******************************************************************************/
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static int
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handle_logout_request(struct trans *self)
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{
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LOG(LOG_LEVEL_INFO, "xrdp-sesexec pid %d is now logging out", g_pid);
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sesexec_terminate_main_loop(0);
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return 0;
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}
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/******************************************************************************/
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static int
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handle_create_session_request(struct trans *self)
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{
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struct session_parameters sp = {0};
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int status;
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status = eicp_get_create_session_request(
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self, &sp.x11_display,
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&sp.type, &sp.width, &sp.height,
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&sp.bpp, &sp.shell, &sp.directory,
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&sp.instance_name);
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if (status == 0)
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{
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enum scp_screate_status scp_status = E_SCP_SCREATE_OK;
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const char *display = "";
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// Must be logged in to start a session
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if (g_login_info == NULL)
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{
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scp_status = E_SCP_SCREATE_NOT_LOGGED_IN;
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}
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else
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{
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// Try to create the session
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sp.guid = guid_new();
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scp_status = session_start(g_login_info, &sp, &g_session_data);
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if (scp_status == E_SCP_SCREATE_OK)
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{
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display = session_get_display(g_session_data);
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}
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}
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// Return the creation status to sesman.
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status = eicp_send_create_session_response(self, scp_status, display,
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&sp.guid);
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if (status == 0 && scp_status == E_SCP_SCREATE_OK)
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{
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// Further comms to sesman is sent over the ERCP protocol
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ercp_trans_from_eicp_trans(self, sesexec_ercp_data_in, NULL);
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// Announce the session to sesman
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if ((status = ercp_send_session_announce_event(
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self,
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display,
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g_login_info->uid,
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sp.type,
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sp.width,
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sp.height,
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sp.bpp,
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&sp.guid,
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g_login_info->ip_addr,
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session_get_start_time(g_session_data),
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sp.instance_name)) != 0)
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{
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// We failed to tell sesman about the new session. This
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// probably means sesman has exited in the time between
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// asking us to start a session, and our reply. This
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// could be many seconds, and a new sesman may well
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// have started.
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// If we enable the restart functionality at
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// this point, we have a race condition that could
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// result in a session which sesman doesn't know
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// about. The simplest thing to do in this rare situation
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// is to abort the session - the user can create a
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// new one
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LOG(LOG_LEVEL_ERROR,
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"sesman appears to have failed - stopping session");
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}
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else if ((status = sesexec_discover_enable()) != 0)
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{
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// Equally regrettable - we can't make the session
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// discoverable, so we'll stop it.
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LOG(LOG_LEVEL_ERROR,
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"unable to make session discoverable"
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" - stopping session");
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}
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}
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}
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if (status != 0)
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{
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// Kill sesexec, and any active session
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sesexec_terminate_main_loop(status);
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}
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return 0;
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}
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/******************************************************************************/
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int
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eicp_server(struct trans *self)
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{
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int rv = 0;
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enum eicp_msg_code msgno;
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switch ((msgno = eicp_msg_in_get_msgno(self)))
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{
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case E_EICP_SYS_LOGIN_REQUEST:
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rv = handle_sys_login_request(self);
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break;
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case E_EICP_UDS_LOGIN_REQUEST:
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rv = handle_uds_login_request(self);
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break;
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case E_EICP_LOGOUT_REQUEST:
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rv = handle_logout_request(self);
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break;
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case E_EICP_CREATE_SESSION_REQUEST:
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rv = handle_create_session_request(self);
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break;
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default:
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{
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char buff[64];
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eicp_msgno_to_str(msgno, buff, sizeof(buff));
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LOG(LOG_LEVEL_ERROR, "Ignored EICP message %s", buff);
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}
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}
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return rv;
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}
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