609 lines
15 KiB
C
609 lines
15 KiB
C
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2015
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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 sesman.c
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* @brief Main program file
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* @author Jay Sorg
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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 <stdarg.h>
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#include "sesman.h"
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#include "xrdp_configure_options.h"
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#include "string_calls.h"
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struct sesman_startup_params
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{
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const char *sesman_ini;
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int kill;
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int no_daemon;
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int help;
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int version;
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};
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int g_sck;
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int g_pid;
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unsigned char g_fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
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struct config_sesman *g_cfg; /* defined in config.h */
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tintptr g_term_event = 0;
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/*****************************************************************************/
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/**
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* @brief looks for a case-insensitive match of a string in a list
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* @param candidate String to match
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* @param ... NULL-terminated list of strings to compare the candidate with
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* @return !=0 if the candidate is found in the list
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*/
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static int nocase_matches(const char *candidate, ...)
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{
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va_list vl;
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const char *member;
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int result = 0;
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va_start(vl, candidate);
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while ((member = va_arg(vl, const char *)) != NULL)
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{
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if (g_strcasecmp(candidate, member) == 0)
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{
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result = 1;
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break;
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}
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}
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va_end(vl);
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return result;
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}
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/*****************************************************************************/
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/**
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*
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* @brief Command line argument parser
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* @param[in] argc number of command line arguments
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* @param[in] argv pointer array of commandline arguments
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* @param[out] sesman_startup_params Returned startup parameters
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* @return 0 on success, n on nth argument is unknown
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*
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*/
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static int
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sesman_process_params(int argc, char **argv,
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struct sesman_startup_params *startup_params)
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{
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int index;
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const char *option;
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const char *value;
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index = 1;
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while (index < argc)
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{
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option = argv[index];
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if (index + 1 < argc)
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{
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value = argv[index + 1];
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}
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else
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{
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value = "";
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}
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if (nocase_matches(option, "-help", "--help", "-h", NULL))
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{
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startup_params->help = 1;
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}
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else if (nocase_matches(option, "-kill", "--kill", "-k", NULL))
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{
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startup_params->kill = 1;
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}
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else if (nocase_matches(option, "-nodaemon", "--nodaemon", "-n",
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"-nd", "--nd", "-ns", "--ns", NULL))
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{
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startup_params->no_daemon = 1;
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}
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else if (nocase_matches(option, "-v", "--version", NULL))
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{
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startup_params->version = 1;
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}
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else if (nocase_matches(option, "-c", "--config", NULL))
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{
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index++;
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startup_params->sesman_ini = value;
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}
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else /* unknown option */
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{
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return index;
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}
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index++;
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}
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return 0;
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}
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/******************************************************************************/
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static int sesman_listen_test(struct config_sesman *cfg)
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{
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int error;
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int sck;
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int rv = 0;
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sck = g_tcp_socket();
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if (sck < 0)
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{
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return 1;
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}
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LOG(LOG_LEVEL_DEBUG, "Testing if xrdp-sesman can listen on %s port %s.",
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cfg->listen_address, cfg->listen_port);
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g_tcp_set_non_blocking(sck);
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error = scp_tcp_bind(sck, cfg->listen_address, cfg->listen_port);
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if (error == 0)
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{
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/* try to listen */
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error = g_tcp_listen(sck);
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if (error == 0)
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{
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/* if listen succeeded, stop listen immediately */
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g_sck_close(sck);
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}
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else
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{
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rv = 1;
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}
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}
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else
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{
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rv = 1;
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}
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return rv;
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}
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/******************************************************************************/
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/**
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*
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* @brief Starts sesman main loop
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*
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*/
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static int
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sesman_main_loop(void)
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{
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int in_sck;
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int error;
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int robjs_count;
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int cont;
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int rv = 0;
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tbus sck_obj;
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tbus robjs[8];
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g_sck = g_tcp_socket();
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if (g_sck < 0)
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{
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LOG(LOG_LEVEL_ERROR, "error opening socket, g_tcp_socket() failed...");
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return 1;
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}
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g_tcp_set_non_blocking(g_sck);
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error = scp_tcp_bind(g_sck, g_cfg->listen_address, g_cfg->listen_port);
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if (error == 0)
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{
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error = g_tcp_listen(g_sck);
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if (error == 0)
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{
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LOG(LOG_LEVEL_INFO, "listening to port %s on %s",
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g_cfg->listen_port, g_cfg->listen_address);
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sck_obj = g_create_wait_obj_from_socket(g_sck, 0);
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cont = 1;
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while (cont)
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{
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/* build the wait obj list */
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robjs_count = 0;
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robjs[robjs_count++] = sck_obj;
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robjs[robjs_count++] = g_term_event;
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/* wait */
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if (g_obj_wait(robjs, robjs_count, 0, 0, -1) != 0)
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{
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/* error, should not get here */
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g_sleep(100);
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}
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if (g_is_wait_obj_set(g_term_event)) /* term */
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{
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break;
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}
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if (g_is_wait_obj_set(sck_obj)) /* incoming connection */
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{
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in_sck = g_tcp_accept(g_sck);
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if ((in_sck == -1) && g_tcp_last_error_would_block(g_sck))
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{
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/* should not get here */
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g_sleep(100);
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}
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else if (in_sck == -1)
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{
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/* error, should not get here */
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break;
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}
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else
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{
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/* we've got a connection, so we pass it to scp code */
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LOG_DEVEL(LOG_LEVEL_DEBUG, "new connection");
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scp_process_start((void *)(tintptr)in_sck);
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g_sck_close(in_sck);
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}
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}
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}
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g_delete_wait_obj_from_socket(sck_obj);
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}
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else
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{
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LOG(LOG_LEVEL_ERROR, "listen error %d (%s)",
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g_get_errno(), g_get_strerror());
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rv = 1;
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}
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}
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else
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{
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LOG(LOG_LEVEL_ERROR, "bind error on "
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"port '%s': %d (%s)", g_cfg->listen_port,
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g_get_errno(), g_get_strerror());
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rv = 1;
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}
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g_tcp_close(g_sck);
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return rv;
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}
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/*****************************************************************************/
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static void
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print_version(void)
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{
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g_writeln("xrdp-sesman %s", PACKAGE_VERSION);
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g_writeln(" The xrdp session manager");
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g_writeln(" Copyright (C) 2004-2020 Jay Sorg, "
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"Neutrino Labs, and all contributors.");
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g_writeln(" See https://github.com/neutrinolabs/xrdp for more information.");
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g_writeln("%s", "");
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#if defined(XRDP_CONFIGURE_OPTIONS)
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g_writeln(" Configure options:");
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g_writeln("%s", XRDP_CONFIGURE_OPTIONS);
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#endif
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}
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/******************************************************************************/
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static void
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print_help(void)
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{
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g_printf("Usage: xrdp-sesman [options]\n");
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g_printf(" -k, --kill shut down xrdp-sesman\n");
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g_printf(" -h, --help show help\n");
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g_printf(" -v, --version show version\n");
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g_printf(" -n, --nodaemon don't fork into background\n");
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g_printf(" -c, --config specify new path to sesman.ini\n");
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g_deinit();
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}
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/******************************************************************************/
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static int
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kill_running_sesman(const char *pid_file)
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{
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int error;
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int fd;
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int pid;
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char pid_s[32] = {0};
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/* check if sesman is running */
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if (!g_file_exist(pid_file))
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{
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g_printf("sesman is not running (pid file not found - %s)\n", pid_file);
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g_deinit();
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return 1;
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}
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fd = g_file_open(pid_file);
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if (-1 == fd)
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{
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g_printf("error opening pid file[%s]: %s\n", pid_file, g_get_strerror());
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return 1;
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}
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error = g_file_read(fd, pid_s, sizeof(pid_s) - 1);
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if (-1 == error)
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{
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g_printf("error reading pid file: %s\n", g_get_strerror());
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g_file_close(fd);
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g_deinit();
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return 1;
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}
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g_file_close(fd);
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pid = g_atoi(pid_s);
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error = g_sigterm(pid);
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if (0 != error)
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{
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g_printf("error killing sesman: %s\n", g_get_strerror());
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}
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else
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{
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g_file_delete(pid_file);
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}
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g_deinit();
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return error;
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}
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/******************************************************************************/
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int
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main(int argc, char **argv)
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{
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int error;
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enum logReturns log_error;
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char text[256];
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char pid_file[256];
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char default_sesman_ini[256];
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struct sesman_startup_params startup_params = {0};
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int errored_argc;
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int daemon;
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g_init("xrdp-sesman");
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g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
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g_snprintf(default_sesman_ini, 255, "%s/sesman.ini", XRDP_CFG_PATH);
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startup_params.sesman_ini = default_sesman_ini;
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errored_argc = sesman_process_params(argc, argv, &startup_params);
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if (errored_argc > 0)
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{
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print_version();
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g_writeln("%s", "");
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print_help();
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g_writeln("%s", "");
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g_writeln("Unknown option: %s", argv[errored_argc]);
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g_deinit();
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g_exit(1);
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}
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if (startup_params.help)
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{
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print_help();
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g_exit(0);
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}
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if (startup_params.version)
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{
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print_version();
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g_exit(0);
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}
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if (startup_params.kill)
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{
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g_exit(kill_running_sesman(pid_file));
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}
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daemon = !startup_params.no_daemon;
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if (!daemon)
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{
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g_printf("starting sesman in foreground...\n");
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}
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if (g_file_exist(pid_file))
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{
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g_printf("xrdp-sesman is already running.\n");
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g_printf("if it's not running, try removing ");
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g_printf("%s", pid_file);
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g_printf("\n");
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g_deinit();
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g_exit(1);
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}
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/* reading config */
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if ((g_cfg = config_read(startup_params.sesman_ini)) == NULL)
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{
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g_printf("error reading config %s: %s\nquitting.\n",
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startup_params.sesman_ini, g_get_strerror());
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g_deinit();
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g_exit(1);
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}
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/* not to spit on the console, show config summary only when running
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* in foreground */
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if (!daemon)
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{
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config_dump(g_cfg);
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}
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/* starting logging subsystem */
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log_error = log_start(startup_params.sesman_ini, "xrdp-sesman");
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if (log_error != LOG_STARTUP_OK)
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{
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switch (log_error)
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{
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case LOG_ERROR_MALLOC:
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g_writeln("error on malloc. cannot start logging. quitting.");
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break;
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case LOG_ERROR_FILE_OPEN:
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g_writeln("error opening log file [%s]. quitting.",
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getLogFile(text, 255));
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break;
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default:
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g_writeln("error");
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break;
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}
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config_free(g_cfg);
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g_deinit();
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g_exit(1);
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}
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LOG(LOG_LEVEL_TRACE, "config loaded in %s at %s:%d", __func__, __FILE__, __LINE__);
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LOG(LOG_LEVEL_TRACE, " sesman_ini = %s", g_cfg->sesman_ini);
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LOG(LOG_LEVEL_TRACE, " listen_address = %s", g_cfg->listen_address);
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LOG(LOG_LEVEL_TRACE, " listen_port = %s", g_cfg->listen_port);
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LOG(LOG_LEVEL_TRACE, " enable_user_wm = %d", g_cfg->enable_user_wm);
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LOG(LOG_LEVEL_TRACE, " default_wm = %s", g_cfg->default_wm);
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LOG(LOG_LEVEL_TRACE, " user_wm = %s", g_cfg->user_wm);
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LOG(LOG_LEVEL_TRACE, " reconnect_sh = %s", g_cfg->reconnect_sh);
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LOG(LOG_LEVEL_TRACE, " auth_file_path = %s", g_cfg->auth_file_path);
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if (daemon)
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{
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/* not to spit on the console, shut up stdout/stderr before anything's logged */
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g_file_close(0);
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g_file_close(1);
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g_file_close(2);
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if (g_file_open("/dev/null") < 0)
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{
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}
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if (g_file_open("/dev/null") < 0)
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{
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}
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if (g_file_open("/dev/null") < 0)
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{
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}
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}
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/* libscp initialization */
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scp_init();
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if (daemon)
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{
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/* start of daemonizing code */
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if (sesman_listen_test(g_cfg) != 0)
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{
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LOG(LOG_LEVEL_ERROR, "Failed to start xrdp-sesman daemon, "
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"possibly address already in use.");
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config_free(g_cfg);
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g_deinit();
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g_exit(1);
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}
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if (0 != g_fork())
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{
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config_free(g_cfg);
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g_deinit();
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g_exit(0);
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}
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}
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/* signal handling */
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g_pid = g_getpid();
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/* old style signal handling is now managed synchronously by a
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* separate thread. uncomment this block if you need old style
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* signal handling and comment out thread_sighandler_start()
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* going back to old style for the time being
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* problem with the sigaddset functions in sig.c - jts */
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#if 1
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g_signal_hang_up(sig_sesman_reload_cfg); /* SIGHUP */
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g_signal_user_interrupt(sig_sesman_shutdown); /* SIGINT */
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g_signal_terminate(sig_sesman_shutdown); /* SIGTERM */
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g_signal_child_stop(sig_sesman_session_end); /* SIGCHLD */
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#endif
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#if 0
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thread_sighandler_start();
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#endif
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if (daemon)
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{
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/* writing pid file */
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char pid_s[32];
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int fd = g_file_open(pid_file);
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if (-1 == fd)
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{
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LOG(LOG_LEVEL_ERROR,
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"error opening pid file[%s]: %s",
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pid_file, g_get_strerror());
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log_end();
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config_free(g_cfg);
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g_deinit();
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g_exit(1);
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}
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g_sprintf(pid_s, "%d", g_pid);
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g_file_write(fd, pid_s, g_strlen(pid_s));
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g_file_close(fd);
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}
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/* start program main loop */
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LOG(LOG_LEVEL_INFO,
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"starting xrdp-sesman with pid %d", g_pid);
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/* make sure the socket directory exists */
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|
g_mk_socket_path("xrdp-sesman");
|
|
|
|
/* make sure the /tmp/.X11-unix directory exists */
|
|
if (!g_directory_exist("/tmp/.X11-unix"))
|
|
{
|
|
if (!g_create_dir("/tmp/.X11-unix"))
|
|
{
|
|
LOG(LOG_LEVEL_ERROR,
|
|
"sesman.c: error creating dir /tmp/.X11-unix");
|
|
}
|
|
g_chmod_hex("/tmp/.X11-unix", 0x1777);
|
|
}
|
|
|
|
g_snprintf(text, 255, "xrdp_sesman_%8.8x_main_term", g_pid);
|
|
g_term_event = g_create_wait_obj(text);
|
|
|
|
error = sesman_main_loop();
|
|
|
|
/* clean up PID file on exit */
|
|
if (daemon)
|
|
{
|
|
g_file_delete(pid_file);
|
|
}
|
|
|
|
g_delete_wait_obj(g_term_event);
|
|
|
|
if (!daemon)
|
|
{
|
|
log_end();
|
|
}
|
|
|
|
config_free(g_cfg);
|
|
g_deinit();
|
|
g_exit(error);
|
|
return 0;
|
|
}
|