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xrdp/xrdp/xrdp.c
Koichiro IWAO c0c7c3f106
xrdp: unify inconsistent mixed use of 
* configure params
* configure options
* configure string
2018-06-27 09:00:55 +09:00

700 lines
18 KiB
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/**
* xrdp: A Remote Desktop Protocol server.
*
* Copyright (C) Jay Sorg 2004-2014
*
* 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.
*
* main program
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "xrdp.h"
#include "log.h"
#include "xrdp_configure_options.h"
#if !defined(PACKAGE_VERSION)
#define PACKAGE_VERSION "???"
#endif
#define THREAD_WAITING 100
static struct xrdp_listen *g_listen = 0;
static long g_threadid = 0; /* main threadid */
static long g_sync_mutex = 0;
static long g_sync1_mutex = 0;
static tbus g_term_event = 0;
static tbus g_sync_event = 0;
/* synchronize stuff */
static int g_sync_command = 0;
static long g_sync_result = 0;
static long g_sync_param1 = 0;
static long g_sync_param2 = 0;
static long (*g_sync_func)(long param1, long param2);
/*****************************************************************************/
void
print_version(void)
{
g_writeln("xrdp %s", PACKAGE_VERSION);
g_writeln(" A Remote Desktop Protocol Server.");
g_writeln(" Copyright (C) 2004-2018 Jay Sorg, "
"Neutrino Labs, and all contributors.");
g_writeln(" See https://github.com/neutrinolabs/xrdp for more information.");
g_writeln("%s", "");
#if defined(XRDP_CONFIGURE_OPTIONS)
g_writeln(" Configure options:");
g_writeln("%s", XRDP_CONFIGURE_OPTIONS);
#endif
g_writeln(" Compiled with %s", get_openssl_version());
}
/*****************************************************************************/
void
print_help(void)
{
g_writeln("Usage: xrdp [options]");
g_writeln(" -h, --help show help");
g_writeln(" -n, --nodaemon don't fork into background");
g_writeln(" -k, --kill shut down xrdp");
g_writeln(" -p, --port tcp listen port");
g_writeln(" -f, --fork fork on new connection");
}
/*****************************************************************************/
/* This function is used to run a function from the main thread.
Sync_func is the function pointer that will run from main thread
The function can have two long in parameters and must return long */
long
g_xrdp_sync(long (*sync_func)(long param1, long param2), long sync_param1,
long sync_param2)
{
long sync_result;
int sync_command;
/* If the function is called from the main thread, the function can
* be called directly. g_threadid= main thread ID*/
if (tc_threadid_equal(tc_get_threadid(), g_threadid))
{
/* this is the main thread, call the function directly */
/* in fork mode, this always happens too */
sync_result = sync_func(sync_param1, sync_param2);
/*g_writeln("g_xrdp_sync processed IN main thread -> continue");*/
}
else
{
/* All threads have to wait here until the main thread
* process the function. g_process_waiting_function() is called
* from the listening thread. g_process_waiting_function() process the function*/
tc_mutex_lock(g_sync1_mutex);
tc_mutex_lock(g_sync_mutex);
g_sync_param1 = sync_param1;
g_sync_param2 = sync_param2;
g_sync_func = sync_func;
/* set a value THREAD_WAITING so the g_process_waiting_function function
* know if any function must be processed */
g_sync_command = THREAD_WAITING;
tc_mutex_unlock(g_sync_mutex);
/* set this event so that the main thread know if
* g_process_waiting_function() must be called */
g_set_wait_obj(g_sync_event);
do
{
g_sleep(100);
tc_mutex_lock(g_sync_mutex);
/* load new value from global to see if the g_process_waiting_function()
* function has processed the function */
sync_command = g_sync_command;
sync_result = g_sync_result;
tc_mutex_unlock(g_sync_mutex);
}
while (sync_command != 0); /* loop until g_process_waiting_function()
* has processed the request */
tc_mutex_unlock(g_sync1_mutex);
/*g_writeln("g_xrdp_sync processed BY main thread -> continue");*/
}
return sync_result;
}
/*****************************************************************************/
void
xrdp_shutdown(int sig)
{
tbus threadid;
threadid = tc_get_threadid();
g_writeln("shutting down");
g_writeln("signal %d threadid %lld", sig, (long long)threadid);
if (!g_is_wait_obj_set(g_term_event))
{
g_set_wait_obj(g_term_event);
}
}
/*****************************************************************************/
void
xrdp_child(int sig)
{
int safety;
for (safety = 0; (g_waitchild() >= 0) && (safety <= 10); safety++)
{
}
}
/*****************************************************************************/
/* called in child just after fork */
int
xrdp_child_fork(void)
{
int pid;
char text[256];
/* close, don't delete these */
g_close_wait_obj(g_term_event);
g_close_wait_obj(g_sync_event);
pid = g_getpid();
g_snprintf(text, 255, "xrdp_%8.8x_main_term", pid);
g_term_event = g_create_wait_obj(text);
g_snprintf(text, 255, "xrdp_%8.8x_main_sync", pid);
g_sync_event = g_create_wait_obj(text);
return 0;
}
/*****************************************************************************/
int
g_is_term(void)
{
return g_is_wait_obj_set(g_term_event);
}
/*****************************************************************************/
void
g_set_term(int in_val)
{
if (in_val)
{
g_set_wait_obj(g_term_event);
}
else
{
g_reset_wait_obj(g_term_event);
}
}
/*****************************************************************************/
tbus
g_get_term_event(void)
{
return g_term_event;
}
/*****************************************************************************/
tbus
g_get_sync_event(void)
{
return g_sync_event;
}
/*****************************************************************************/
void
pipe_sig(int sig_num)
{
/* do nothing */
g_writeln("got XRDP SIGPIPE(%d)", sig_num);
}
/*****************************************************************************/
/*Some function must be called from the main thread.
if g_sync_command==THREAD_WAITING a function is waiting to be processed*/
void
g_process_waiting_function(void)
{
tc_mutex_lock(g_sync_mutex);
if (g_sync_command != 0)
{
if (g_sync_func != 0)
{
if (g_sync_command == THREAD_WAITING)
{
g_sync_result = g_sync_func(g_sync_param1, g_sync_param2);
}
}
g_sync_command = 0;
}
tc_mutex_unlock(g_sync_mutex);
}
/*****************************************************************************/
/**
*
* @brief Command line argument parser
* @param number of command line arguments
* @param pointer array of commandline arguments
* @return 0 on success, n on nth argument is unknown
*
*/
int
xrdp_process_params(int argc, char **argv,
struct xrdp_startup_params *startup_params)
{
int index;
char option[128];
char value[128];
index = 1;
while (index < argc)
{
g_strncpy(option, argv[index], 127);
if (index + 1 < argc)
{
g_strncpy(value, argv[index + 1], 127);
}
else
{
value[0] = 0;
}
if ((g_strncasecmp(option, "-help", 255)) == 0 ||
(g_strncasecmp(option, "--help", 255)) == 0 ||
(g_strncasecmp(option, "-h", 255)) == 0)
{
startup_params->help = 1;
}
else if ((g_strncasecmp(option, "-kill", 255) == 0) ||
(g_strncasecmp(option, "--kill", 255) == 0) ||
(g_strncasecmp(option, "-k", 255) == 0))
{
startup_params->kill = 1;
}
else if ((g_strncasecmp(option, "-nodaemon", 255) == 0) ||
(g_strncasecmp(option, "--nodaemon", 255) == 0) ||
(g_strncasecmp(option, "-n", 255) == 0) ||
(g_strncasecmp(option, "-nd", 255) == 0) ||
(g_strncasecmp(option, "--nd", 255) == 0) ||
(g_strncasecmp(option, "-ns", 255) == 0) ||
(g_strncasecmp(option, "--ns", 255) == 0))
{
startup_params->no_daemon = 1;
}
else if ((g_strncasecmp(option, "-v", 255) == 0) ||
(g_strncasecmp(option, "--version", 255) == 0))
{
startup_params->version = 1;
}
else if ((g_strncasecmp(option, "-p", 255) == 0) ||
(g_strncasecmp(option, "--port", 255) == 0))
{
index++;
g_strncpy(startup_params->port, value, 127);
if (g_strlen(startup_params->port) < 1)
{
g_writeln("error processing params, port [%s]", startup_params->port);
return 1;
}
else
{
g_writeln("--port parameter found, ini override [%s]",
startup_params->port);
}
}
else if ((g_strncasecmp(option, "-f", 255) == 0) ||
(g_strncasecmp(option, "--fork", 255) == 0))
{
startup_params->fork = 1;
g_writeln("--fork parameter found, ini override");
}
else /* unknown option */
{
return index;
}
index++;
}
return 0;
}
/*****************************************************************************/
/* Basic sanity checks before any forking */
int
xrdp_sanity_check(void)
{
int intval = 1;
int host_be;
char key_file[256];
/* check compiled endian with actual endian */
host_be = !((int)(*(unsigned char *)(&intval)));
#if defined(B_ENDIAN)
if (!host_be)
{
g_writeln("Not a big endian machine, edit arch.h");
return 1;
}
#endif
#if defined(L_ENDIAN)
if (host_be)
{
g_writeln("Not a little endian machine, edit arch.h");
return 1;
}
#endif
/* check long, int and void* sizes */
if (sizeof(int) != 4)
{
g_writeln("unusable int size, must be 4");
return 1;
}
if (sizeof(long) != sizeof(void *))
{
g_writeln("long size must match void* size");
return 1;
}
if (sizeof(long) != 4 && sizeof(long) != 8)
{
g_writeln("unusable long size, must be 4 or 8");
return 1;
}
if (sizeof(tui64) != 8)
{
g_writeln("unusable tui64 size, must be 8");
return 1;
}
g_snprintf(key_file, 255, "%s/rsakeys.ini", XRDP_CFG_PATH);
if (!g_file_exist(key_file))
{
g_writeln("File %s is missing, create it using xrdp-keygen", key_file);
return 1;
}
return 0;
}
/*****************************************************************************/
int
main(int argc, char **argv)
{
int exit_status = 0;
int test;
char cfg_file[256];
enum logReturns error;
struct xrdp_startup_params *startup_params;
int pid;
int fd;
int no_daemon;
char text[256];
char pid_file[256];
int errored_argc;
g_init("xrdp");
ssl_init();
for (test = 0; test < argc; test++)
{
DEBUG(("Argument %i - %s", test, argv[test]));
}
g_snprintf(cfg_file, 255, "%s/xrdp.ini", XRDP_CFG_PATH);
startup_params = (struct xrdp_startup_params *)
g_malloc(sizeof(struct xrdp_startup_params), 1);
errored_argc = xrdp_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);
}
g_snprintf(pid_file, 255, "%s/xrdp.pid", XRDP_PID_PATH);
no_daemon = 0;
if (startup_params->help)
{
print_version();
g_writeln("%s", "");
print_help();
g_deinit();
g_exit(0);
}
if (startup_params->version)
{
print_version();
g_deinit();
g_exit(0);
}
if (xrdp_sanity_check() != 0)
{
g_writeln("Fatal error occurred, exiting");
g_deinit();
g_exit(1);
}
if (startup_params->kill)
{
g_writeln("stopping xrdp");
/* read the xrdp.pid file */
fd = -1;
if (g_file_exist(pid_file)) /* xrdp.pid */
{
fd = g_file_open(pid_file); /* xrdp.pid */
}
if (fd == -1)
{
g_writeln("cannot open %s, maybe xrdp is not running", pid_file);
}
else
{
g_memset(text, 0, 32);
g_file_read(fd, text, 31);
pid = g_atoi(text);
g_writeln("stopping process id %d", pid);
if (pid > 0)
{
g_sigterm(pid);
}
g_file_close(fd);
}
g_deinit();
g_exit(0);
}
/* starting logging subsystem */
error = log_start(cfg_file, "xrdp");
if (error != LOG_STARTUP_OK)
{
switch (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("log_start error");
break;
}
g_deinit();
g_exit(1);
}
if (g_file_exist(pid_file)) /* xrdp.pid */
{
g_writeln("It looks like xrdp is already running.");
g_writeln("If not, delete %s and try again.", pid_file);
g_deinit();
g_exit(0);
}
if (startup_params->no_daemon)
{
no_daemon = 1;
}
if (!no_daemon)
{
/* make sure containing directory exists */
g_create_path(pid_file);
/* make sure we can write to pid file */
fd = g_file_open(pid_file); /* xrdp.pid */
if (fd == -1)
{
g_writeln("running in daemon mode with no access to pid files, quitting");
g_deinit();
g_exit(0);
}
if (g_file_write(fd, "0", 1) == -1)
{
g_writeln("running in daemon mode with no access to pid files, quitting");
g_deinit();
g_exit(0);
}
g_file_close(fd);
g_file_delete(pid_file);
}
if (!no_daemon)
{
/* start of daemonizing code */
pid = g_fork();
if (pid == -1)
{
g_writeln("problem forking");
g_deinit();
g_exit(1);
}
if (0 != pid)
{
/* if can't listen, exit with failure status */
if (xrdp_listen_test() != 0)
{
log_message(LOG_LEVEL_ERROR, "Failed to start xrdp daemon, "
"possibly address already in use.");
g_deinit();
/* must exit with failure status,
or systemd cannot detect xrdp daemon couldn't start properly */
g_exit(1);
}
g_writeln("daemon process %d started ok", pid);
/* exit, this is the main process */
g_deinit();
g_exit(0);
}
g_sleep(1000);
/* write the pid to file */
pid = g_getpid();
fd = g_file_open(pid_file); /* xrdp.pid */
if (fd == -1)
{
g_writeln("trying to write process id to xrdp.pid");
g_writeln("problem opening xrdp.pid");
g_writeln("maybe no rights");
}
else
{
g_sprintf(text, "%d", pid);
g_file_write(fd, text, g_strlen(text));
g_file_close(fd);
}
g_sleep(1000);
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)
{
}
/* end of daemonizing code */
}
g_threadid = tc_get_threadid();
g_listen = xrdp_listen_create();
g_signal_user_interrupt(xrdp_shutdown); /* SIGINT */
g_signal_pipe(pipe_sig); /* SIGPIPE */
g_signal_terminate(xrdp_shutdown); /* SIGTERM */
g_signal_child_stop(xrdp_child); /* SIGCHLD */
g_sync_mutex = tc_mutex_create();
g_sync1_mutex = tc_mutex_create();
pid = g_getpid();
log_message(LOG_LEVEL_INFO, "starting xrdp with pid %d", pid);
g_snprintf(text, 255, "xrdp_%8.8x_main_term", pid);
g_term_event = g_create_wait_obj(text);
if (g_term_event == 0)
{
g_writeln("error creating g_term_event");
}
g_snprintf(text, 255, "xrdp_%8.8x_main_sync", pid);
g_sync_event = g_create_wait_obj(text);
if (g_sync_event == 0)
{
g_writeln("error creating g_sync_event");
}
g_listen->startup_params = startup_params;
exit_status = xrdp_listen_main_loop(g_listen);
xrdp_listen_delete(g_listen);
tc_mutex_delete(g_sync_mutex);
tc_mutex_delete(g_sync1_mutex);
g_delete_wait_obj(g_term_event);
g_delete_wait_obj(g_sync_event);
/* only main process should delete pid file */
if ((!no_daemon) && (pid == g_getpid()))
{
/* delete the xrdp.pid file */
g_file_delete(pid_file);
}
g_free(startup_params);
log_end();
g_deinit();
if (exit_status == 0)
{
g_exit(0);
}
else
{
g_exit(1);
}
return 0;
}
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