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430 lines
12 KiB
430 lines
12 KiB
/*
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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xrdp: A Remote Desktop Protocol server.
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Copyright (C) Jay Sorg 2004-2010
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listen for incoming connection
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*/
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#include "xrdp.h"
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/* 'g_process' is protected by the semaphore 'g_process_sem'. One thread sets
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g_process and waits for the other to process it */
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static tbus g_process_sem = 0;
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static struct xrdp_process* g_process = 0;
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/*****************************************************************************/
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static int
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xrdp_listen_create_pro_done(struct xrdp_listen* self)
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{
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int pid;
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char text[256];
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pid = g_getpid();
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g_snprintf(text, 255, "xrdp_%8.8x_listen_pro_done_event", pid);
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self->pro_done_event = g_create_wait_obj(text);
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if(self->pro_done_event == 0)
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{
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g_writeln("Failure creating pro_done_event");
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}
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return 0;
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}
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/*****************************************************************************/
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struct xrdp_listen* APP_CC
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xrdp_listen_create(void)
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{
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struct xrdp_listen* self;
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self = (struct xrdp_listen*)g_malloc(sizeof(struct xrdp_listen), 1);
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xrdp_listen_create_pro_done(self);
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self->process_list = list_create();
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if (g_process_sem == 0)
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{
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g_process_sem = tc_sem_create(0);
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}
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self->listen_trans = trans_create(TRANS_MODE_TCP, 16, 16);
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if (self->listen_trans == 0)
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{
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g_writeln("xrdp_listen_create: trans_create failed");
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}
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return self;
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}
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/*****************************************************************************/
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void APP_CC
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xrdp_listen_delete(struct xrdp_listen* self)
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{
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if (self->listen_trans != 0)
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{
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trans_delete(self->listen_trans);
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}
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if (g_process_sem != 0)
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{
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tc_sem_delete(g_process_sem);
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g_process_sem = 0;
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}
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g_delete_wait_obj(self->pro_done_event);
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list_delete(self->process_list);
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g_free(self);
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}
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/*****************************************************************************/
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/* returns error */
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static int APP_CC
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xrdp_listen_add_pro(struct xrdp_listen* self, struct xrdp_process* process)
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{
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list_add_item(self->process_list, (tbus)process);
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return 0;
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}
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/*****************************************************************************/
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static int APP_CC
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xrdp_listen_delete_done_pro(struct xrdp_listen* self)
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{
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int i;
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struct xrdp_process* pro;
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for (i = self->process_list->count - 1; i >= 0; i--)
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{
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pro = (struct xrdp_process*)list_get_item(self->process_list, i);
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if (pro != 0)
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{
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if (pro->status < 0)
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{
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xrdp_process_delete(pro);
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list_remove_item(self->process_list, i);
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}
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}
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}
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return 0;
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}
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/*****************************************************************************/
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/* i can't get stupid in_val to work, hum using global var for now */
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THREAD_RV THREAD_CC
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xrdp_process_run(void* in_val)
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{
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struct xrdp_process* process;
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DEBUG(("process started"));
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process = g_process;
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g_process = 0;
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tc_sem_inc(g_process_sem);
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xrdp_process_main_loop(process);
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DEBUG(("process done"));
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return 0;
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}
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/*****************************************************************************/
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static int
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xrdp_listen_get_port_address(char* port, int port_bytes,
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char* address, int address_bytes,
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int *tcp_nodelay, int *tcp_keepalive,
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struct xrdp_startup_params* startup_param)
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{
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int fd;
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int error;
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int index;
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char* val;
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struct list* names;
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struct list* values;
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char cfg_file[256];
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/* default to port 3389 */
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g_strncpy(port, "3389", port_bytes - 1);
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/* Default to all */
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g_strncpy(address, "0.0.0.0", address_bytes - 1);
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/* see if port or address is in xrdp.ini file */
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g_snprintf(cfg_file, 255, "%s/xrdp.ini", XRDP_CFG_PATH);
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fd = g_file_open(cfg_file);
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*tcp_nodelay = 0 ;
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*tcp_keepalive = 0 ;
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if (fd > 0)
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{
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names = list_create();
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names->auto_free = 1;
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values = list_create();
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values->auto_free = 1;
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if (file_read_section(fd, "globals", names, values) == 0)
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{
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for (index = 0; index < names->count; index++)
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{
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val = (char*)list_get_item(names, index);
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if (val != 0)
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{
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if (g_strcasecmp(val, "port") == 0)
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{
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val = (char*)list_get_item(values, index);
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error = g_atoi(val);
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if ((error > 0) && (error < 65000))
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{
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g_strncpy(port, val, port_bytes - 1);
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}
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}
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if (g_strcasecmp(val, "address") == 0)
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{
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val = (char*)list_get_item(values, index);
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g_strncpy(address, val, address_bytes - 1);
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}
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if (g_strcasecmp(val, "fork") == 0)
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{
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val = (char*)list_get_item(values, index);
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if ((g_strcasecmp(val, "yes") == 0) ||
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(g_strcasecmp(val, "on") == 0) ||
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(g_strcasecmp(val, "true") == 0) ||
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(g_atoi(val) != 0))
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{
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startup_param->fork = 1;
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}
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}
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if (g_strcasecmp(val, "tcp_nodelay") == 0)
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{
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val = (char*)list_get_item(values, index);
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if ((g_strcasecmp(val, "yes") == 0) ||
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(g_strcasecmp(val, "on") == 0) ||
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(g_strcasecmp(val, "true") == 0) ||
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(g_atoi(val) != 0))
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{
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*tcp_nodelay = 1 ;
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}
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}
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if (g_strcasecmp(val, "tcp_keepalive") == 0)
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{
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val = (char*)list_get_item(values, index);
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if ((g_strcasecmp(val, "yes") == 0) ||
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(g_strcasecmp(val, "on") == 0) ||
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(g_strcasecmp(val, "true") == 0) ||
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(g_atoi(val) != 0))
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{
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*tcp_keepalive = 1 ;
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}
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}
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}
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}
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}
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list_delete(names);
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list_delete(values);
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g_file_close(fd);
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}
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/* startup_param overrides */
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if (startup_param->port[0] != 0)
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{
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g_strncpy(port, startup_param->port, port_bytes - 1);
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}
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return 0;
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}
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/*****************************************************************************/
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static int APP_CC
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xrdp_listen_fork(struct xrdp_listen* self, struct trans* server_trans)
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{
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int pid;
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struct xrdp_process* process;
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pid = g_fork();
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if (pid == 0)
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{
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/* child */
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/* recreate some main globals */
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xrdp_child_fork();
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/* recreate the process done wait object, not used in fork mode */
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/* close, don't delete this */
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g_close_wait_obj(self->pro_done_event);
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xrdp_listen_create_pro_done(self);
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/* delete listener, child need not listen */
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trans_delete(self->listen_trans);
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self->listen_trans = 0;
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/* new connect instance */
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process = xrdp_process_create(self, 0);
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process->server_trans = server_trans;
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g_process = process;
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xrdp_process_run(0);
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xrdp_process_delete(process);
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/* mark this process to exit */
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g_set_term(1);
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return 0;
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}
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/* parent */
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trans_delete(server_trans);
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return 0;
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}
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/*****************************************************************************/
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/* a new connection is coming in */
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int DEFAULT_CC
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xrdp_listen_conn_in(struct trans* self, struct trans* new_self)
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{
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struct xrdp_process* process;
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struct xrdp_listen* lis;
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lis = (struct xrdp_listen*)(self->callback_data);
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if (lis->startup_params->fork)
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{
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return xrdp_listen_fork(lis, new_self);
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}
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process = xrdp_process_create(lis, lis->pro_done_event);
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if (xrdp_listen_add_pro(lis, process) == 0)
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{
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/* start thread */
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process->server_trans = new_self;
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g_process = process;
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tc_thread_create(xrdp_process_run, 0);
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tc_sem_dec(g_process_sem); /* this will wait */
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}
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else
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{
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xrdp_process_delete(process);
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}
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return 0;
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}
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/*****************************************************************************/
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/* wait for incoming connections */
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int APP_CC
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xrdp_listen_main_loop(struct xrdp_listen* self)
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{
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int error;
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int robjs_count;
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int cont;
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int timeout = 0;
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char port[128];
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char address[256];
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tbus robjs[8];
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tbus term_obj;
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tbus sync_obj;
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tbus done_obj;
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int tcp_nodelay;
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int tcp_keepalive;
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self->status = 1;
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if (xrdp_listen_get_port_address(port, sizeof(port),
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address, sizeof(address),
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&tcp_nodelay, &tcp_keepalive,
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self->startup_params) != 0)
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{
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g_writeln("xrdp_listen_main_loop: xrdp_listen_get_port failed");
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self->status = -1;
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return 1;
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}
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/*Create socket*/
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error = trans_listen_address(self->listen_trans, port, address);
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if (error == 0)
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{
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if(tcp_nodelay)
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{
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if(g_tcp_set_no_delay(self->listen_trans->sck))
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{
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g_writeln("Error setting tcp_nodelay");
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}
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}
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if(tcp_keepalive)
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{
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if(g_tcp_set_keepalive(self->listen_trans->sck))
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{
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g_writeln("Error setting tcp_keepalive");
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}
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}
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self->listen_trans->trans_conn_in = xrdp_listen_conn_in;
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self->listen_trans->callback_data = self;
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term_obj = g_get_term_event(); /*Global termination event */
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sync_obj = g_get_sync_event();
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done_obj = self->pro_done_event;
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cont = 1;
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while (cont)
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{
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/* build the wait obj list */
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robjs_count = 0;
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robjs[robjs_count++] = term_obj;
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robjs[robjs_count++] = sync_obj;
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robjs[robjs_count++] = done_obj;
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timeout = -1;
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if (trans_get_wait_objs(self->listen_trans, robjs, &robjs_count) != 0)
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{
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g_writeln("Listening socket is in wrong state we terminate listener") ;
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break;
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}
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/* wait - timeout -1 means wait indefinitely*/
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if (g_obj_wait(robjs, robjs_count, 0, 0, timeout) != 0)
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{
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/* error, should not get here */
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g_sleep(100);
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}
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if (g_is_wait_obj_set(term_obj)) /* termination called */
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{
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break;
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}
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if (g_is_wait_obj_set(sync_obj)) /* some function must be processed by this thread */
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{
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g_reset_wait_obj(sync_obj);
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g_process_waiting_function(); /* run the function */
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}
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if (g_is_wait_obj_set(done_obj)) /* pro_done_event */
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{
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g_reset_wait_obj(done_obj);
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/* a process has died remove it from lists*/
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xrdp_listen_delete_done_pro(self);
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}
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/* Run the callback when accept() returns a new socket*/
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if (trans_check_wait_objs(self->listen_trans) != 0)
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{
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break;
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}
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}
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/* stop listening */
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trans_delete(self->listen_trans);
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self->listen_trans = 0;
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/* second loop to wait for all process threads to close */
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cont = 1;
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while (cont)
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{
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if (self->process_list->count == 0)
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{
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break;
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}
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timeout = -1;
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/* build the wait obj list */
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robjs_count = 0;
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robjs[robjs_count++] = sync_obj;
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robjs[robjs_count++] = done_obj;
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/* wait - timeout -1 means wait indefinitely*/
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if (g_obj_wait(robjs, robjs_count, 0, 0, timeout) != 0)
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{
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/* error, should not get here */
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g_sleep(100);
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}
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if (g_is_wait_obj_set(sync_obj)) /* some function must be processed by this thread */
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{
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g_reset_wait_obj(sync_obj);
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g_process_waiting_function(); /* run the function that is waiting*/
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}
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if (g_is_wait_obj_set(done_obj)) /* pro_done_event */
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{
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g_reset_wait_obj(done_obj);
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xrdp_listen_delete_done_pro(self);
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}
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}
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}
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else
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{
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g_writeln("xrdp_listen_main_loop: listen error, possible port "
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"already in use");
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}
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self->status = -1;
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return 0;
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}
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