885 lines
22 KiB
C
885 lines
22 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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/**
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* Maximum number of short-lived connections to sesman
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*
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* At the moment, all connections to sesman are short-lived. This may change
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* in the future
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*/
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#define MAX_SHORT_LIVED_CONNECTIONS 16
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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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int dump_config;
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};
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struct config_sesman *g_cfg;
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unsigned char g_fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
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tintptr g_term_event = 0;
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tintptr g_sigchld_event = 0;
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tintptr g_reload_event = 0;
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/**
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* Items stored on the g_con_list
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*/
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struct sesman_con
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{
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struct trans *t;
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struct SCP_SESSION *s;
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};
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static struct trans *g_list_trans;
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static struct list *g_con_list = NULL;
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static int g_pid;
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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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* Allocates a sesman_con struct
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*
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* @param trans Pointer to newly-allocated transport
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* @return struct sesman_con pointer
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*/
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static struct sesman_con *
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alloc_connection(struct trans *t)
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{
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struct sesman_con *result;
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struct SCP_SESSION *s;
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if ((result = g_new(struct sesman_con, 1)) != NULL)
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{
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if ((s = scp_session_create()) != NULL)
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{
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result->t = t;
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result->s = s;
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/* Ensure we can find the connection easily from a callback */
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t->callback_data = (void *)result;
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}
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else
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{
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g_free(result);
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result = NULL;
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}
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}
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return result;
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}
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/**
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* Deletes a sesman_con struct, freeing resources
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*
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* After this call, the passed-in pointer is invalid and must not be
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* referenced.
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*
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* @param sc struct to de-allocate
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*/
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static void
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delete_connection(struct sesman_con *sc)
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{
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trans_delete(sc->t);
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scp_session_destroy(sc->s);
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g_free(sc);
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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, "--dump-config", NULL))
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{
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startup_params->dump_config = 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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int
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sesman_close_all(void)
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{
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int index;
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struct sesman_con *sc;
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LOG_DEVEL(LOG_LEVEL_TRACE, "sesman_close_all:");
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sesman_delete_listening_transport();
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for (index = 0; index < g_con_list->count; index++)
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{
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sc = (struct sesman_con *) list_get_item(g_con_list, index);
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delete_connection(sc);
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}
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return 0;
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}
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/******************************************************************************/
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static int
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sesman_data_in(struct trans *self)
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{
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#define HEADER_SIZE 8
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int version;
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int size;
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if (self->extra_flags == 0)
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{
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in_uint32_be(self->in_s, version);
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in_uint32_be(self->in_s, size);
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if (size < HEADER_SIZE || size > self->in_s->size)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_data_in: bad message size %d", size);
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return 1;
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}
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self->header_size = size;
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self->extra_flags = 1;
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}
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else
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{
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/* process message */
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struct sesman_con *sc = (struct sesman_con *)self->callback_data;
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self->in_s->p = self->in_s->data;
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if (scp_process(self, sc->s) != SCP_SERVER_STATE_OK)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_data_in: scp_process_msg failed");
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return 1;
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}
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/* reset for next message */
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self->header_size = HEADER_SIZE;
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self->extra_flags = 0;
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init_stream(self->in_s, 0); /* Reset input stream pointers */
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}
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return 0;
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#undef HEADER_SIZE
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}
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/******************************************************************************/
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static int
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sesman_listen_conn_in(struct trans *self, struct trans *new_self)
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{
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struct sesman_con *sc;
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if (g_con_list->count >= MAX_SHORT_LIVED_CONNECTIONS)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_data_in: error, too many "
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"connections, rejecting");
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trans_delete(new_self);
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}
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else if ((sc = alloc_connection(new_self)) == NULL)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_data_in: No memory to allocate "
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"new connection");
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trans_delete(new_self);
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}
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else
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{
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new_self->header_size = 8;
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new_self->trans_data_in = sesman_data_in;
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new_self->no_stream_init_on_data_in = 1;
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new_self->extra_flags = 0;
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list_add_item(g_con_list, (intptr_t) sc);
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}
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return 0;
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}
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/******************************************************************************/
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/**
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* Informs the main loop a termination signal has been received
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*/
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static void
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set_term_event(int sig)
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{
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/* Don't try to use a wait obj in a child process */
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if (g_getpid() == g_pid)
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{
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g_set_wait_obj(g_term_event);
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}
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}
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/******************************************************************************/
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/**
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* Informs the main loop a SIGCHLD has been received
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*/
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static void
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set_sigchld_event(int sig)
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{
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/* Don't try to use a wait obj in a child process */
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if (g_getpid() == g_pid)
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{
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g_set_wait_obj(g_sigchld_event);
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}
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}
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/******************************************************************************/
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/**
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* Informs the main loop a SIGHUP has been received
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*/
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static void
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set_reload_event(int sig)
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{
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/* Don't try to use a wait obj in a child process */
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if (g_getpid() == g_pid)
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{
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g_set_wait_obj(g_reload_event);
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}
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}
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/******************************************************************************/
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void
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sesman_delete_listening_transport(void)
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{
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trans_delete(g_list_trans);
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g_list_trans = NULL;
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}
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/******************************************************************************/
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int
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sesman_create_listening_transport(const struct config_sesman *cfg)
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{
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int rv = 1;
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g_list_trans = trans_create(TRANS_MODE_TCP, 8192, 8192);
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if (g_list_trans == NULL)
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{
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LOG(LOG_LEVEL_ERROR, "%s: trans_create failed", __func__);
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}
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else
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{
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LOG(LOG_LEVEL_DEBUG, "%s: address %s port %s",
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__func__, cfg->listen_address, cfg->listen_port);
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rv = trans_listen_address(g_list_trans, cfg->listen_port,
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cfg->listen_address);
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if (rv != 0)
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{
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LOG(LOG_LEVEL_ERROR, "%s: trans_listen_address failed", __func__);
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sesman_delete_listening_transport();
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}
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else
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{
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g_list_trans->trans_conn_in = sesman_listen_conn_in;
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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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/**
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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 error;
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int robjs_count;
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int wobjs_count;
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int timeout;
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int index;
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intptr_t robjs[32];
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intptr_t wobjs[32];
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struct sesman_con *scon;
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g_con_list = list_create();
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if (g_con_list == NULL)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_main_loop: list_create failed");
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return 1;
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}
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if (sesman_create_listening_transport(g_cfg) != 0)
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{
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LOG(LOG_LEVEL_ERROR,
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"sesman_main_loop: sesman_create_listening_transport failed");
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list_delete(g_con_list);
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return 1;
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}
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error = 0;
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while (!error)
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{
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timeout = -1;
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robjs_count = 0;
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robjs[robjs_count++] = g_term_event;
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robjs[robjs_count++] = g_sigchld_event;
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robjs[robjs_count++] = g_reload_event;
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wobjs_count = 0;
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for (index = 0; index < g_con_list->count; index++)
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{
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scon = (struct sesman_con *)list_get_item(g_con_list, index);
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if (scon != NULL)
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{
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error = trans_get_wait_objs_rw(scon->t,
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robjs, &robjs_count,
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wobjs, &wobjs_count, &timeout);
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if (error != 0)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
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"trans_get_wait_objs_rw failed");
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break;
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}
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}
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}
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if (error != 0)
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{
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break;
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}
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if (g_list_trans != NULL)
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{
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/* g_list_trans might be NULL on a reconfigure if sesman
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* is unable to listen again */
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error = trans_get_wait_objs_rw(g_list_trans, robjs, &robjs_count,
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wobjs, &wobjs_count, &timeout);
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if (error != 0)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
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"trans_get_wait_objs_rw failed");
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break;
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}
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}
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if (g_obj_wait(robjs, robjs_count, wobjs, wobjs_count, timeout) != 0)
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{
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/* should not get here */
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LOG(LOG_LEVEL_WARNING, "sesman_main_loop: "
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"Unexpected error from g_obj_wait()");
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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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LOG(LOG_LEVEL_INFO, "sesman_main_loop: "
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"sesman asked to terminate");
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break;
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}
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if (g_is_wait_obj_set(g_sigchld_event)) /* A child has exited */
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{
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g_reset_wait_obj(g_sigchld_event);
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sig_sesman_session_end();
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}
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if (g_is_wait_obj_set(g_reload_event)) /* We're asked to reload */
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{
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g_reset_wait_obj(g_reload_event);
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sig_sesman_reload_cfg();
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}
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for (index = 0; index < g_con_list->count; index++)
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{
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scon = (struct sesman_con *)list_get_item(g_con_list, index);
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if (scon != NULL)
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{
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if (trans_check_wait_objs(scon->t) != 0)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
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"trans_check_wait_objs failed, removing trans");
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delete_connection(scon);
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list_remove_item(g_con_list, index);
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index--;
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continue;
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}
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}
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}
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if (g_list_trans != NULL)
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{
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error = trans_check_wait_objs(g_list_trans);
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if (error != 0)
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{
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LOG(LOG_LEVEL_ERROR, "sesman_main_loop: "
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"trans_check_wait_objs failed");
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break;
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}
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}
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}
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for (index = 0; index < g_con_list->count; index++)
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{
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scon = (struct sesman_con *) list_get_item(g_con_list, index);
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delete_connection(scon);
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}
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list_delete(g_con_list);
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sesman_delete_listening_transport();
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return 0;
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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:");
|
|
g_writeln("%s", XRDP_CONFIGURE_OPTIONS);
|
|
#endif
|
|
}
|
|
|
|
/******************************************************************************/
|
|
static void
|
|
print_help(void)
|
|
{
|
|
g_printf("Usage: xrdp-sesman [options]\n");
|
|
g_printf(" -k, --kill shut down xrdp-sesman\n");
|
|
g_printf(" -h, --help show help\n");
|
|
g_printf(" -v, --version show version\n");
|
|
g_printf(" -n, --nodaemon don't fork into background\n");
|
|
g_printf(" -c, --config specify new path to sesman.ini\n");
|
|
g_writeln(" --dump-config display config on stdout on startup");
|
|
g_deinit();
|
|
}
|
|
|
|
/******************************************************************************/
|
|
static int
|
|
kill_running_sesman(const char *pid_file)
|
|
{
|
|
int error;
|
|
int fd;
|
|
int pid;
|
|
char pid_s[32] = {0};
|
|
|
|
/* check if sesman is running */
|
|
if (!g_file_exist(pid_file))
|
|
{
|
|
g_printf("sesman is not running (pid file not found - %s)\n", pid_file);
|
|
g_deinit();
|
|
return 1;
|
|
}
|
|
|
|
fd = g_file_open(pid_file);
|
|
|
|
if (-1 == fd)
|
|
{
|
|
g_printf("error opening pid file[%s]: %s\n", pid_file, g_get_strerror());
|
|
return 1;
|
|
}
|
|
|
|
error = g_file_read(fd, pid_s, sizeof(pid_s) - 1);
|
|
|
|
if (-1 == error)
|
|
{
|
|
g_printf("error reading pid file: %s\n", g_get_strerror());
|
|
g_file_close(fd);
|
|
g_deinit();
|
|
return 1;
|
|
}
|
|
|
|
g_file_close(fd);
|
|
pid = g_atoi(pid_s);
|
|
|
|
error = g_sigterm(pid);
|
|
|
|
if (0 != error)
|
|
{
|
|
g_printf("error killing sesman: %s\n", g_get_strerror());
|
|
}
|
|
else
|
|
{
|
|
g_file_delete(pid_file);
|
|
}
|
|
|
|
g_deinit();
|
|
return error;
|
|
}
|
|
/******************************************************************************/
|
|
int
|
|
main(int argc, char **argv)
|
|
{
|
|
int error;
|
|
enum logReturns log_error;
|
|
char text[256];
|
|
char pid_file[256];
|
|
char default_sesman_ini[256];
|
|
struct sesman_startup_params startup_params = {0};
|
|
int errored_argc;
|
|
int daemon;
|
|
|
|
g_init("xrdp-sesman");
|
|
g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
|
|
g_snprintf(default_sesman_ini, 255, "%s/sesman.ini", XRDP_CFG_PATH);
|
|
|
|
startup_params.sesman_ini = default_sesman_ini;
|
|
|
|
errored_argc = sesman_process_params(argc, argv, &startup_params);
|
|
if (errored_argc > 0)
|
|
{
|
|
print_version();
|
|
g_writeln("%s", "");
|
|
print_help();
|
|
g_writeln("%s", "");
|
|
|
|
g_writeln("Unknown option: %s", argv[errored_argc]);
|
|
g_deinit();
|
|
g_exit(1);
|
|
}
|
|
|
|
if (startup_params.help)
|
|
{
|
|
print_help();
|
|
g_exit(0);
|
|
}
|
|
|
|
if (startup_params.version)
|
|
{
|
|
print_version();
|
|
g_exit(0);
|
|
}
|
|
|
|
|
|
if (startup_params.kill)
|
|
{
|
|
g_exit(kill_running_sesman(pid_file));
|
|
}
|
|
|
|
if (g_file_exist(pid_file))
|
|
{
|
|
g_printf("xrdp-sesman is already running.\n");
|
|
g_printf("if it's not running, try removing ");
|
|
g_printf("%s", pid_file);
|
|
g_printf("\n");
|
|
g_deinit();
|
|
g_exit(1);
|
|
}
|
|
|
|
/* starting logging subsystem */
|
|
if (!g_file_exist(startup_params.sesman_ini))
|
|
{
|
|
g_printf("Config file %s does not exist\n", startup_params.sesman_ini);
|
|
g_deinit();
|
|
g_exit(1);
|
|
}
|
|
log_error = log_start(
|
|
startup_params.sesman_ini, "xrdp-sesman",
|
|
(startup_params.dump_config) ? LOG_START_DUMP_CONFIG : 0);
|
|
|
|
if (log_error != LOG_STARTUP_OK)
|
|
{
|
|
switch (log_error)
|
|
{
|
|
case LOG_ERROR_MALLOC:
|
|
g_writeln("error on malloc. cannot start logging. quitting.");
|
|
break;
|
|
case LOG_ERROR_FILE_OPEN:
|
|
g_writeln("error opening log file [%s]. quitting.",
|
|
getLogFile(text, 255));
|
|
break;
|
|
default:
|
|
// Assume sufficient messages have already been generated
|
|
break;
|
|
}
|
|
|
|
g_deinit();
|
|
g_exit(1);
|
|
}
|
|
|
|
/* reading config */
|
|
if ((g_cfg = config_read(startup_params.sesman_ini)) == NULL)
|
|
{
|
|
LOG(LOG_LEVEL_ALWAYS, "error reading config %s: %s",
|
|
startup_params.sesman_ini, g_get_strerror());
|
|
log_end();
|
|
g_deinit();
|
|
g_exit(1);
|
|
}
|
|
|
|
if (startup_params.dump_config)
|
|
{
|
|
config_dump(g_cfg);
|
|
}
|
|
|
|
LOG(LOG_LEVEL_TRACE, "config loaded in %s at %s:%d", __func__, __FILE__, __LINE__);
|
|
LOG(LOG_LEVEL_TRACE, " sesman_ini = %s", g_cfg->sesman_ini);
|
|
LOG(LOG_LEVEL_TRACE, " listen_address = %s", g_cfg->listen_address);
|
|
LOG(LOG_LEVEL_TRACE, " listen_port = %s", g_cfg->listen_port);
|
|
LOG(LOG_LEVEL_TRACE, " enable_user_wm = %d", g_cfg->enable_user_wm);
|
|
LOG(LOG_LEVEL_TRACE, " default_wm = %s", g_cfg->default_wm);
|
|
LOG(LOG_LEVEL_TRACE, " user_wm = %s", g_cfg->user_wm);
|
|
LOG(LOG_LEVEL_TRACE, " reconnect_sh = %s", g_cfg->reconnect_sh);
|
|
LOG(LOG_LEVEL_TRACE, " auth_file_path = %s", g_cfg->auth_file_path);
|
|
|
|
daemon = !startup_params.no_daemon;
|
|
if (daemon)
|
|
{
|
|
/* not to spit on the console, shut up stdout/stderr before anything's logged */
|
|
g_file_close(0);
|
|
g_file_close(1);
|
|
g_file_close(2);
|
|
|
|
if (g_file_open("/dev/null") < 0)
|
|
{
|
|
}
|
|
|
|
if (g_file_open("/dev/null") < 0)
|
|
{
|
|
}
|
|
|
|
if (g_file_open("/dev/null") < 0)
|
|
{
|
|
}
|
|
}
|
|
|
|
/* libscp initialization */
|
|
scp_init();
|
|
|
|
|
|
if (daemon)
|
|
{
|
|
/* start of daemonizing code */
|
|
if (sesman_listen_test(g_cfg) != 0)
|
|
{
|
|
LOG(LOG_LEVEL_ERROR, "Failed to start xrdp-sesman daemon, "
|
|
"possibly address already in use.");
|
|
config_free(g_cfg);
|
|
g_deinit();
|
|
g_exit(1);
|
|
}
|
|
|
|
if (0 != g_fork())
|
|
{
|
|
config_free(g_cfg);
|
|
g_deinit();
|
|
g_exit(0);
|
|
}
|
|
|
|
}
|
|
|
|
/* signal handling */
|
|
g_pid = g_getpid();
|
|
g_snprintf(text, 255, "xrdp_sesman_%8.8x_main_term", g_pid);
|
|
g_term_event = g_create_wait_obj(text);
|
|
g_snprintf(text, 255, "xrdp_sesman_%8.8x_sigchld", g_pid);
|
|
g_sigchld_event = g_create_wait_obj(text);
|
|
g_snprintf(text, 255, "xrdp_sesman_%8.8x_reload", g_pid);
|
|
g_reload_event = g_create_wait_obj(text);
|
|
|
|
g_signal_hang_up(set_reload_event); /* SIGHUP */
|
|
g_signal_user_interrupt(set_term_event); /* SIGINT */
|
|
g_signal_terminate(set_term_event); /* SIGTERM */
|
|
g_signal_child_stop(set_sigchld_event); /* SIGCHLD */
|
|
|
|
if (daemon)
|
|
{
|
|
/* writing pid file */
|
|
char pid_s[32];
|
|
int fd = g_file_open(pid_file);
|
|
|
|
if (-1 == fd)
|
|
{
|
|
LOG(LOG_LEVEL_ERROR,
|
|
"error opening pid file[%s]: %s",
|
|
pid_file, g_get_strerror());
|
|
log_end();
|
|
config_free(g_cfg);
|
|
g_deinit();
|
|
g_exit(1);
|
|
}
|
|
|
|
g_sprintf(pid_s, "%d", g_pid);
|
|
g_file_write(fd, pid_s, g_strlen(pid_s));
|
|
g_file_close(fd);
|
|
}
|
|
|
|
/* start program main loop */
|
|
LOG(LOG_LEVEL_INFO,
|
|
"starting xrdp-sesman with pid %d", g_pid);
|
|
|
|
/* make sure the socket directory exists */
|
|
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);
|
|
}
|
|
|
|
error = sesman_main_loop();
|
|
|
|
/* clean up PID file on exit */
|
|
if (daemon)
|
|
{
|
|
g_file_delete(pid_file);
|
|
}
|
|
|
|
g_delete_wait_obj(g_reload_event);
|
|
g_delete_wait_obj(g_sigchld_event);
|
|
g_delete_wait_obj(g_term_event);
|
|
|
|
if (!daemon)
|
|
{
|
|
log_end();
|
|
}
|
|
|
|
config_free(g_cfg);
|
|
g_deinit();
|
|
g_exit(error);
|
|
return 0;
|
|
}
|