/*
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
xrdp: A Remote Desktop Protocol server.
Copyright (C) Jay Sorg 2005-2008
*/
/**
*
* @file sesman.c
* @brief Main program file
* @author Jay Sorg
*
*/
#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 */
tbus g_term_event = 0;
tbus g_sync_event = 0;
extern int g_thread_sck; /* in thread.c */
/******************************************************************************/
/**
*
* @brief Starts sesman main loop
*
*/
static void DEFAULT_CC
sesman_main_loop(void)
{
int in_sck;
int error;
int robjs_count;
int cont;
tbus sck_obj;
tbus robjs[8];
/*main program loop*/
log_message(&(g_cfg->log), LOG_LEVEL_INFO, "listening...");
g_sck = g_tcp_socket();
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)
{
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;
robjs[robjs_count++] = g_sync_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(g_sync_event)) /* sync */
{
g_reset_wait_obj(g_sync_event);
session_sync_start();
}
if (g_is_wait_obj_set(sck_obj)) /* incomming 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(&(g_cfg->log), "new connection");
thread_scp_start(in_sck);
/* todo, do we have to wait here ? */
}
}
}
g_delete_wait_obj_from_socket(sck_obj);
}
else
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "listen error %d (%s)",
g_get_errno(), g_get_strerror());
}
}
else
{
log_message(&(g_cfg->log), LOG_LEVEL_ERROR, "bind error on "
"port '%s': %d (%s)", g_cfg->listen_port,
g_get_errno(), g_get_strerror());
}
g_tcp_close(g_sck);
}
/******************************************************************************/
int DEFAULT_CC
main(int argc, char** argv)
{
int fd;
int error;
int daemon = 1;
int pid;
char pid_s[8];
char text[256];
char pid_file[256];
g_snprintf(pid_file, 255, "%s/xrdp-sesman.pid", XRDP_PID_PATH);
if (1 == argc)
{
/* no options on command line. normal startup */
g_printf("starting sesman...\n");
daemon = 1;
}
else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--nodaemon")) ||
(0 == g_strcasecmp(argv[1], "-n")) ||
(0 == g_strcasecmp(argv[1], "-ns"))))
{
/* starts sesman not daemonized */
g_printf("starting sesman in foregroud...\n");
daemon = 0;
}
else if ((2 == argc) && ((0 == g_strcasecmp(argv[1], "--help")) ||
(0 == g_strcasecmp(argv[1], "-h"))))
{
/* help screen */
g_printf("sesman - xrdp session manager\n\n");
g_printf("usage: sesman [command]\n\n");
g_printf("command can be one of the following:\n");
g_printf("-n, -ns, --nodaemon starts sesman in foreground\n");
g_printf("-k, --kill kills running sesman\n");
g_printf("-h, --help shows this help\n");
g_printf("if no command is specified, sesman is started in background");
g_exit(0);
}
else if ((2 == argc) && ((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_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;
}
error = g_file_read(fd, pid_s, 7);
if (-1 == error)
{
g_printf("error reading pid file: %s\n", g_get_strerror());
g_file_close(fd);
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_exit(error);
}
else
{
/* there's something strange on the command line */
g_printf("sesman - xrdp session manager\n\n");
g_printf("error: invalid command line\n");
g_printf("usage: sesman [ --nodaemon | --kill | --help ]\n");
g_exit(1);
}
if (g_file_exist(pid_file))
{
g_printf("sesman is already running.\n");
g_printf("if it's not running, try removing ");
g_printf(pid_file);
g_printf("\n");
g_exit(1);
}
/* reading config */
g_cfg = g_malloc(sizeof(struct config_sesman), 1);
if (0 == g_cfg)
{
g_printf("error creating config: quitting.\n");
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_exit(1);
}
/* starting logging subsystem */
error = log_start(&(g_cfg->log));
if (error != LOG_STARTUP_OK)
{
switch (error)
{
case LOG_ERROR_MALLOC:
g_printf("error on malloc. cannot start logging. quitting.\n");
break;
case LOG_ERROR_FILE_OPEN:
g_printf("error opening log file [%s]. quitting.\n", g_cfg->log.log_file);
break;
}
g_exit(1);
}
/* libscp initialization */
scp_init(&(g_cfg->log));
if (daemon)
{
/* start of daemonizing code */
g_pid = g_fork();
if (0 != g_pid)
{
g_exit(0);
}
g_file_close(0);
g_file_close(1);
g_file_close(2);
g_file_open("/dev/null");
g_file_open("/dev/null");
g_file_open("/dev/null");
}
/* initializing locks */
lock_init();
/* 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_kill(sig_sesman_shutdown); /* SIGKILL */
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(&(g_cfg->log), LOG_LEVEL_ERROR,
"error opening pid file[%s]: %s",
pid_file, g_get_strerror());
log_end(&(g_cfg->log));
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(&(g_cfg->log), LOG_LEVEL_ALWAYS,
"starting sesman with pid %d", g_pid);
/* make sure the /tmp/.X11-unix directory exist */
if (!g_directory_exist("/tmp/.X11-unix"))
{
g_create_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);
g_snprintf(text, 255, "xrdp_sesman_%8.8x_main_sync", g_pid);
g_sync_event = g_create_wait_obj(text);
sesman_main_loop();
/* clean up PID file on exit */
if (daemon)
{
g_file_delete(pid_file);
}
g_delete_wait_obj(g_term_event);
g_delete_wait_obj(g_sync_event);
if (!daemon)
{
log_end(&(g_cfg->log));
}
return 0;
}