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627 lines
18 KiB
627 lines
18 KiB
/**
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* xrdp: A Remote Desktop Protocol server.
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*
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* Copyright (C) Jay Sorg 2004-2014
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* listen for incoming connection
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*/
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#if defined(HAVE_CONFIG_H)
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#include <config_ac.h>
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#endif
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#include "xrdp.h"
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#include "log.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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log_message(LOG_LEVEL_ERROR,"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 *
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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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/* setting TCP mode now, may change later */
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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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log_message(LOG_LEVEL_ERROR,"xrdp_listen_create: trans_create failed");
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}
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else
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{
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self->listen_trans->is_term = g_is_term;
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}
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return self;
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}
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/*****************************************************************************/
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void
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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
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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
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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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int *mode,
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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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*mode = TRANS_MODE_TCP;
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*tcp_nodelay = 0 ;
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*tcp_keepalive = 0 ;
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if (fd != -1)
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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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if (val[0] == '/')
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{
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g_strncpy(port, val, port_bytes - 1);
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}
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else
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{
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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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}
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if (g_strcasecmp(val, "use_vsock") == 0)
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{
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val = (char *)list_get_item(values, index);
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if (g_text2bool(val) == 1)
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{
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*mode = TRANS_MODE_VSOCK;
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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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startup_param->fork = g_text2bool(val);
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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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*tcp_nodelay = g_text2bool(val);
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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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*tcp_keepalive = g_text2bool(val);
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}
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if (g_strcasecmp(val, "tcp_send_buffer_bytes") == 0)
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{
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val = (char *)list_get_item(values, index);
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startup_param->send_buffer_bytes = g_atoi(val);
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}
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if (g_strcasecmp(val, "tcp_recv_buffer_bytes") == 0)
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{
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val = (char *)list_get_item(values, index);
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startup_param->recv_buffer_bytes = g_atoi(val);
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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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}
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if (fd != -1)
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g_file_close(fd);
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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
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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_from_child(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
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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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passes through trans_listen_address return value */
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int
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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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int bytes;
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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->listen_trans->mode,
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self->startup_params) != 0)
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{
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log_message(LOG_LEVEL_ERROR,"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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if (port[0] == '/')
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{
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/* set UDS mode */
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self->listen_trans->mode = TRANS_MODE_UNIX;
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/* not valid with UDS */
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tcp_nodelay = 0;
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}
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else if (self->listen_trans->mode == TRANS_MODE_VSOCK)
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{
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/* not valid with VSOCK */
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tcp_nodelay = 0;
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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 (port[0] == '/')
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{
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g_chmod_hex(port, 0x0666);
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}
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if (error == 0)
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{
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log_message(LOG_LEVEL_INFO, "listening to port %s on %s",
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port, address);
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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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log_message(LOG_LEVEL_ERROR,"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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log_message(LOG_LEVEL_ERROR,"Error setting tcp_keepalive");
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}
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}
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if (self->startup_params->send_buffer_bytes > 0)
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{
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bytes = self->startup_params->send_buffer_bytes;
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log_message(LOG_LEVEL_INFO, "setting send buffer to %d bytes",
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bytes);
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if (g_sck_set_send_buffer_bytes(self->listen_trans->sck,
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bytes) != 0)
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{
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log_message(LOG_LEVEL_ERROR, "error setting send buffer");
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}
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else
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{
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if (g_sck_get_send_buffer_bytes(self->listen_trans->sck,
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&bytes) != 0)
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{
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log_message(LOG_LEVEL_ERROR, "error getting send buffer");
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}
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else
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{
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log_message(LOG_LEVEL_INFO, "send buffer set to %d bytes", bytes);
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}
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}
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}
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if (self->startup_params->recv_buffer_bytes > 0)
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{
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bytes = self->startup_params->recv_buffer_bytes;
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log_message(LOG_LEVEL_INFO, "setting recv buffer to %d bytes",
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bytes);
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if (g_sck_set_recv_buffer_bytes(self->listen_trans->sck,
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bytes) != 0)
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{
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log_message(LOG_LEVEL_ERROR, "error setting recv buffer");
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}
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else
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{
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if (g_sck_get_recv_buffer_bytes(self->listen_trans->sck,
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&bytes) != 0)
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{
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log_message(LOG_LEVEL_ERROR, "error getting recv buffer");
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}
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else
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{
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log_message(LOG_LEVEL_INFO, "recv buffer set to %d bytes", bytes);
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}
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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,
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&robjs_count) != 0)
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{
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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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/* some function must be processed by this thread */
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if (g_is_wait_obj_set(sync_obj))
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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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/* some function must be processed by this thread */
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if (g_is_wait_obj_set(sync_obj))
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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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|
}
|
|
else
|
|
{
|
|
log_message(LOG_LEVEL_ERROR,"xrdp_listen_main_loop: listen error, possible port "
|
|
"already in use");
|
|
#if !defined(XRDP_ENABLE_VSOCK)
|
|
if (self->listen_trans->mode == TRANS_MODE_VSOCK)
|
|
{
|
|
log_message(LOG_LEVEL_ERROR,"xrdp_listen_main_loop: listen error, "
|
|
"vsock support not compiled and config requested");
|
|
}
|
|
#endif
|
|
}
|
|
|
|
self->status = -1;
|
|
return error;
|
|
}
|
|
|
|
/*****************************************************************************/
|
|
/* returns 0 if xrdp can listen
|
|
returns 1 if xrdp cannot listen */
|
|
int
|
|
xrdp_listen_test(void)
|
|
{
|
|
int rv = 0;
|
|
char port[128];
|
|
int mode;
|
|
char address[256];
|
|
int tcp_nodelay;
|
|
int tcp_keepalive;
|
|
struct xrdp_listen *xrdp_listen;
|
|
struct xrdp_startup_params *startup_params;
|
|
|
|
|
|
startup_params = (struct xrdp_startup_params *)
|
|
g_malloc(sizeof(struct xrdp_startup_params), 1);
|
|
xrdp_listen = xrdp_listen_create();
|
|
xrdp_listen->startup_params = startup_params;
|
|
|
|
|
|
if (xrdp_listen_get_port_address(port, sizeof(port),
|
|
address, sizeof(address),
|
|
&tcp_nodelay, &tcp_keepalive,
|
|
&mode,
|
|
xrdp_listen->startup_params) != 0)
|
|
{
|
|
log_message(LOG_LEVEL_DEBUG, "xrdp_listen_test: "
|
|
"xrdp_listen_get_port_address failed");
|
|
rv = 1;
|
|
goto done;
|
|
}
|
|
|
|
/* try to listen */
|
|
log_message(LOG_LEVEL_DEBUG, "Testing if xrdp can listen on %s port %s.",
|
|
address, port);
|
|
rv = trans_listen_address(xrdp_listen->listen_trans, port, address);
|
|
if (rv == 0)
|
|
{
|
|
/* if listen succeeded, stop listen immediately */
|
|
trans_delete(xrdp_listen->listen_trans);
|
|
xrdp_listen->listen_trans = 0;
|
|
}
|
|
|
|
goto done;
|
|
|
|
done:
|
|
xrdp_listen_delete(xrdp_listen);
|
|
g_free(startup_params);
|
|
return rv;
|
|
}
|