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xrdp-proprietary/sesman/sesman.c

465 lines
12 KiB

/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2015
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
*
* @file sesman.c
* @brief Main program file
* @author Jay Sorg
*
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "sesman.h"
int g_sck;
int g_pid;
unsigned char g_fixedkey[8] = { 23, 82, 107, 6, 35, 78, 88, 7 };
struct config_sesman *g_cfg; /* defined in config.h */
tintptr g_term_event = 0;
/******************************************************************************/
int sesman_listen_test(struct config_sesman *cfg)
{
int error;
int sck;
int rv = 0;
sck = g_tcp_socket();
if (sck < 0)
{
return 1;
}
log_message(LOG_LEVEL_DEBUG, "Testing if xrdp-sesman can listen on %s port %s.",
cfg->listen_address, cfg->listen_port);
g_tcp_set_non_blocking(sck);
error = scp_tcp_bind(sck, cfg->listen_address, cfg->listen_port);
if (error == 0)
{
/* try to listen */
error = g_tcp_listen(sck);
if (error == 0)
{
/* if listen succeeded, stop listen immediately */
g_sck_close(sck);
}
else
{
rv = 1;
}
}
else
{
rv = 1;
}
return rv;
}
/******************************************************************************/
/**
*
* @brief Starts sesman main loop
*
*/
int
sesman_main_loop(void)
{
int in_sck;
int error;
int robjs_count;
int cont;
int rv = 0;
tbus sck_obj;
tbus robjs[8];
g_sck = g_tcp_socket();
if (g_sck < 0)
{
log_message(LOG_LEVEL_ERROR, "error opening socket, g_tcp_socket() failed...");
return 1;
}
g_tcp_set_non_blocking(g_sck);
error = scp_tcp_bind(g_sck, g_cfg->listen_address, g_cfg->listen_port);
if (error == 0)
{
error = g_tcp_listen(g_sck);
if (error == 0)
{
log_message(LOG_LEVEL_INFO, "listening to port %s on %s",
g_cfg->listen_port, g_cfg->listen_address);
sck_obj = g_create_wait_obj_from_socket(g_sck, 0);
cont = 1;
while (cont)
{
/* build the wait obj list */
robjs_count = 0;
robjs[robjs_count++] = sck_obj;
robjs[robjs_count++] = g_term_event;
/* wait */
if (g_obj_wait(robjs, robjs_count, 0, 0, -1) != 0)
{
/* error, should not get here */
g_sleep(100);
}
if (g_is_wait_obj_set(g_term_event)) /* term */
{
break;
}
if (g_is_wait_obj_set(sck_obj)) /* incoming connection */
{
in_sck = g_tcp_accept(g_sck);
if ((in_sck == -1) && g_tcp_last_error_would_block(g_sck))
{
/* should not get here */
g_sleep(100);
}
else if (in_sck == -1)
{
/* error, should not get here */
break;
}
else
{
/* we've got a connection, so we pass it to scp code */
LOG_DBG("new connection");
scp_process_start((void*)(tintptr)in_sck);
g_sck_close(in_sck);
}
}
}
g_delete_wait_obj_from_socket(sck_obj);
}
else
{
log_message(LOG_LEVEL_ERROR, "listen error %d (%s)",
g_get_errno(), g_get_strerror());
rv = 1;
}
}
else
{
log_message(LOG_LEVEL_ERROR, "bind error on "
"port '%s': %d (%s)", g_cfg->listen_port,
g_get_errno(), g_get_strerror());
rv = 1;
}
g_tcp_close(g_sck);
return rv;
}
/******************************************************************************/
void
print_usage(int retcode)
{
g_printf("xrdp-sesman - xrdp session manager\n\n");
g_printf("Usage: xrdp-sesman [options]\n");
g_printf(" -n, --nodaemon run as foreground process\n");
g_printf(" -k, --kill kill running xrdp-sesman\n");
g_printf(" -h, --help show this help\n");
g_deinit();
g_exit(retcode);
}
/******************************************************************************/
int
main(int argc, char **argv)
{
int fd;
enum logReturns log_error;
int error;
int daemon = 1;
int pid;
char pid_s[32];
char text[256];
char pid_file[256];
char cfg_file[256];
g_init("xrdp-sesman");
g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
if (1 == argc)
{
/* start in daemon mode if no cli options */
daemon = 1;
}
else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--nodaemon")) ||
(0 == g_strcasecmp(argv[1], "-nodaemon")) ||
(0 == g_strcasecmp(argv[1], "-n")) ||
(0 == g_strcasecmp(argv[1], "-ns"))))
{
/* starts sesman not daemonized */
9 years ago
g_printf("starting sesman in foreground...\n");
daemon = 0;
}
else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--help")) ||
(0 == g_strcasecmp(argv[1], "-help")) ||
(0 == g_strcasecmp(argv[1], "-h"))))
{
print_usage(0);
}
else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--kill")) ||
(0 == g_strcasecmp(argv[1], "-kill")) ||
(0 == g_strcasecmp(argv[1], "-k"))))
{
/* killing running sesman */
/* 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();
g_exit(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;
}
g_memset(pid_s, 0, sizeof(pid_s));
error = g_file_read(fd, pid_s, 31);
if (-1 == error)
{
g_printf("error reading pid file: %s\n", g_get_strerror());
g_file_close(fd);
g_deinit();
g_exit(error);
}
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();
g_exit(error);
}
else
{
/* there's something strange on the command line */
g_printf("Error: invalid command line arguments\n\n");
print_usage(1);
}
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);
}
/* reading config */
g_cfg = g_new0(struct config_sesman, 1);
if (0 == g_cfg)
{
g_printf("error creating config: quitting.\n");
g_deinit();
g_exit(1);
}
//g_cfg->log.fd = -1; /* don't use logging before reading its config */
if (0 != config_read(g_cfg))
{
g_printf("error reading config: %s\nquitting.\n", g_get_strerror());
g_deinit();
g_exit(1);
}
/* not to spit on the console, show config summary only when running in foreground */
if (!daemon)
{
config_dump(g_cfg);
}
g_snprintf(cfg_file, 255, "%s/sesman.ini", XRDP_CFG_PATH);
/* starting logging subsystem */
log_error = log_start(cfg_file, "xrdp-sesman");
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:
g_writeln("error");
break;
}
g_deinit();
g_exit(1);
}
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);
}
/* libscp initialization */
scp_init();
if (daemon)
{
/* start of daemonizing code */
if (sesman_listen_test(g_cfg) != 0)
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{
log_message(LOG_LEVEL_ERROR, "Failed to start xrdp-sesman daemon, "
"possibly address already in use.");
g_deinit();
g_exit(1);
}
if (0 != g_fork())
{
g_deinit();
g_exit(0);
}
if (g_file_open("/dev/null") < 0)
{
}
if (g_file_open("/dev/null") < 0)
{
}
if (g_file_open("/dev/null") < 0)
{
}
}
/* signal handling */
g_pid = g_getpid();
/* old style signal handling is now managed synchronously by a
* separate thread. uncomment this block if you need old style
* signal handling and comment out thread_sighandler_start()
* going back to old style for the time being
* problem with the sigaddset functions in sig.c - jts */
#if 1
g_signal_hang_up(sig_sesman_reload_cfg); /* SIGHUP */
g_signal_user_interrupt(sig_sesman_shutdown); /* SIGINT */
g_signal_terminate(sig_sesman_shutdown); /* SIGTERM */
g_signal_child_stop(sig_sesman_session_end); /* SIGCHLD */
#endif
#if 0
thread_sighandler_start();
#endif
if (daemon)
{
/* writing pid file */
fd = g_file_open(pid_file);
if (-1 == fd)
{
log_message(LOG_LEVEL_ERROR,
"error opening pid file[%s]: %s",
pid_file, g_get_strerror());
log_end();
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_message(LOG_LEVEL_INFO,
"starting xrdp-sesman with pid %d", g_pid);
/* make sure the socket directory exists */
g_mk_socket_path("xrdp-sesman");
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/* make sure the /tmp/.X11-unix directory exists */
if (!g_directory_exist("/tmp/.X11-unix"))
{
if (!g_create_dir("/tmp/.X11-unix"))
{
log_message(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();
}
g_deinit();
g_exit(error);
return 0;
}