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/*
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 2004-2010
listen for incoming connection
*/
#include "xrdp.h"
/* 'g_process' is protected by the semaphore 'g_process_sem'. One thread sets
g_process and waits for the other to process it */
static tbus g_process_sem = 0;
static struct xrdp_process* g_process = 0;
/*****************************************************************************/
static int
xrdp_listen_create_pro_done(struct xrdp_listen* self)
{
int pid;
char text[256];
pid = g_getpid();
g_snprintf(text, 255, "xrdp_%8.8x_listen_pro_done_event", pid);
self->pro_done_event = g_create_wait_obj(text);
return 0;
}
/*****************************************************************************/
struct xrdp_listen* APP_CC
xrdp_listen_create(void)
{
struct xrdp_listen* self;
self = (struct xrdp_listen*)g_malloc(sizeof(struct xrdp_listen), 1);
xrdp_listen_create_pro_done(self);
self->process_list = list_create();
if (g_process_sem == 0)
{
g_process_sem = tc_sem_create(0);
}
self->listen_trans = trans_create(TRANS_MODE_TCP, 16, 16);
if (self->listen_trans == 0)
{
g_writeln("xrdp_listen_create: trans_create failed");
}
return self;
}
/*****************************************************************************/
void APP_CC
xrdp_listen_delete(struct xrdp_listen* self)
{
if (self->listen_trans != 0)
{
trans_delete(self->listen_trans);
}
if (g_process_sem != 0)
{
tc_sem_delete(g_process_sem);
g_process_sem = 0;
}
g_delete_wait_obj(self->pro_done_event);
list_delete(self->process_list);
g_free(self);
}
/*****************************************************************************/
/* returns error */
static int APP_CC
xrdp_listen_add_pro(struct xrdp_listen* self, struct xrdp_process* process)
{
list_add_item(self->process_list, (tbus)process);
return 0;
}
/*****************************************************************************/
static int APP_CC
xrdp_listen_delete_done_pro(struct xrdp_listen* self)
{
int i;
struct xrdp_process* pro;
for (i = self->process_list->count - 1; i >= 0; i--)
{
pro = (struct xrdp_process*)list_get_item(self->process_list, i);
if (pro != 0)
{
if (pro->status < 0)
{
xrdp_process_delete(pro);
list_remove_item(self->process_list, i);
}
}
}
return 0;
}
/*****************************************************************************/
/* i can't get stupid in_val to work, hum using global var for now */
THREAD_RV THREAD_CC
xrdp_process_run(void* in_val)
{
struct xrdp_process* process;
DEBUG(("process started"));
process = g_process;
g_process = 0;
tc_sem_inc(g_process_sem);
xrdp_process_main_loop(process);
DEBUG(("process done"));
return 0;
}
/*****************************************************************************/
static int
xrdp_listen_get_port_address(char* port, int port_bytes,
char* address, int address_bytes,
struct xrdp_startup_params* startup_param)
{
int fd;
int error;
int index;
char* val;
struct list* names;
struct list* values;
char cfg_file[256];
/* default to port 3389 */
g_strncpy(port, "3389", port_bytes - 1);
/* Default to all */
g_strncpy(address, "0.0.0.0", address_bytes - 1);
/* see if port or address is in xrdp.ini file */
g_snprintf(cfg_file, 255, "%s/xrdp.ini", XRDP_CFG_PATH);
fd = g_file_open(cfg_file);
if (fd > 0)
{
names = list_create();
names->auto_free = 1;
values = list_create();
values->auto_free = 1;
if (file_read_section(fd, "globals", names, values) == 0)
{
for (index = 0; index < names->count; index++)
{
val = (char*)list_get_item(names, index);
if (val != 0)
{
if (g_strcasecmp(val, "port") == 0)
{
val = (char*)list_get_item(values, index);
error = g_atoi(val);
if ((error > 0) && (error < 65000))
{
g_strncpy(port, val, port_bytes - 1);
}
}
if (g_strcasecmp(val, "address") == 0)
{
val = (char*)list_get_item(values, index);
g_strncpy(address, val, address_bytes - 1);
}
if (g_strcasecmp(val, "fork") == 0)
{
val = (char*)list_get_item(values, index);
if ((g_strcasecmp(val, "yes") == 0) ||
(g_strcasecmp(val, "on") == 0) ||
(g_strcasecmp(val, "true") == 0) ||
(g_atoi(val) != 0))
{
startup_param->fork = 1;
}
}
}
}
}
list_delete(names);
list_delete(values);
g_file_close(fd);
}
/* startup_param overrides */
if (startup_param->port[0] != 0)
{
g_strncpy(port, startup_param->port, port_bytes - 1);
}
return 0;
}
/*****************************************************************************/
static int APP_CC
xrdp_listen_fork(struct xrdp_listen* self, struct trans* server_trans)
{
int pid;
struct xrdp_process* process;
pid = g_fork();
if (pid == 0)
{
/* child */
/* recreate some main globals */
xrdp_child_fork();
/* recreate the process done wait object, not used in fork mode */
/* close, don't delete this */
g_close_wait_obj(self->pro_done_event);
xrdp_listen_create_pro_done(self);
/* delete listener, child need not listen */
trans_delete(self->listen_trans);
self->listen_trans = 0;
/* new connect instance */
process = xrdp_process_create(self, 0);
process->server_trans = server_trans;
g_process = process;
xrdp_process_run(0);
xrdp_process_delete(process);
/* mark this process to exit */
g_set_term(1);
return 0;
}
/* parent */
trans_delete(server_trans);
return 0;
}
/*****************************************************************************/
/* a new connection is coming in */
int DEFAULT_CC
xrdp_listen_conn_in(struct trans* self, struct trans* new_self)
{
struct xrdp_process* process;
struct xrdp_listen* lis;
lis = (struct xrdp_listen*)(self->callback_data);
if (lis->startup_params->fork)
{
return xrdp_listen_fork(lis, new_self);
}
process = xrdp_process_create(lis, lis->pro_done_event);
if (xrdp_listen_add_pro(lis, process) == 0)
{
/* start thread */
process->server_trans = new_self;
g_process = process;
tc_thread_create(xrdp_process_run, 0);
tc_sem_dec(g_process_sem); /* this will wait */
}
else
{
xrdp_process_delete(process);
}
return 0;
}
/*****************************************************************************/
/* wait for incoming connections */
int APP_CC
xrdp_listen_main_loop(struct xrdp_listen* self)
{
int error;
int robjs_count;
int cont;
int timeout = 0;
char port[128];
char address[256];
tbus robjs[8];
tbus term_obj;
tbus sync_obj;
tbus done_obj;
self->status = 1;
if (xrdp_listen_get_port_address(port, sizeof(port),
address, sizeof(address),
self->startup_params) != 0)
{
g_writeln("xrdp_listen_main_loop: xrdp_listen_get_port failed");
self->status = -1;
return 1;
}
error = trans_listen_address(self->listen_trans, port, address);
if (error == 0)
{
self->listen_trans->trans_conn_in = xrdp_listen_conn_in;
self->listen_trans->callback_data = self;
term_obj = g_get_term_event();
sync_obj = g_get_sync_event();
done_obj = self->pro_done_event;
cont = 1;
while (cont)
{
/* build the wait obj list */
robjs_count = 0;
robjs[robjs_count++] = term_obj;
robjs[robjs_count++] = sync_obj;
robjs[robjs_count++] = done_obj;
timeout = -1;
if (trans_get_wait_objs(self->listen_trans, robjs, &robjs_count,
&timeout) != 0)
{
break;
}
/* wait */
if (g_obj_wait(robjs, robjs_count, 0, 0, timeout) != 0)
{
/* error, should not get here */
g_sleep(100);
}
if (g_is_wait_obj_set(term_obj)) /* term */
{
break;
}
if (g_is_wait_obj_set(sync_obj)) /* sync */
{
g_reset_wait_obj(sync_obj);
g_loop();
}
if (g_is_wait_obj_set(done_obj)) /* pro_done_event */
{
g_reset_wait_obj(done_obj);
xrdp_listen_delete_done_pro(self);
}
if (trans_check_wait_objs(self->listen_trans) != 0)
{
break;
}
}
/* stop listening */
trans_delete(self->listen_trans);
self->listen_trans = 0;
/* second loop to wait for all process threads to close */
cont = 1;
while (cont)
{
if (self->process_list->count == 0)
{
break;
}
/* build the wait obj list */
robjs_count = 0;
robjs[robjs_count++] = sync_obj;
robjs[robjs_count++] = done_obj;
/* 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(sync_obj)) /* sync */
{
g_reset_wait_obj(sync_obj);
g_loop();
}
if (g_is_wait_obj_set(done_obj)) /* pro_done_event */
{
g_reset_wait_obj(done_obj);
xrdp_listen_delete_done_pro(self);
}
}
}
else
{
g_writeln("xrdp_listen_main_loop: listen error, possible port "
"already in use");
}
self->status = -1;
return 0;
}
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