text: /****************************************************************************
   *
   * Copyright 2016 Samsung Electronics All Rights Reserved.
   *
   * 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.
   *
   ****************************************************************************/
  
  /*
   * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without modification,
   * are permitted provided that the following conditions are met:
   *
   * 1. Redistributions of source code must retain the above copyright notice,
   *    this list of conditions and the following disclaimer.
   * 2. Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 3. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
   * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
   * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
   * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
   * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
   * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
   * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
   * OF SUCH DAMAGE.
   *
   * This file is part of the lwIP TCP/IP stack.
   *
   * Author: Adam Dunkels <adam@sics.se>
   *
   */
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <tinyara/config.h>
  
  #ifdef CONFIG_NETUTILS_DHCPD
  
  #include <stdio.h>
  #include <stdint.h>
  #include <unistd.h>
  #include <string.h>
  #include <errno.h>
  
  #include <net/if.h>
  
  #include <protocols/dhcpd.h>
  #include <netutils/netlib.h>
  
  /****************************************************************************
   * Preprocessor Definitions
   ****************************************************************************/
  #define DHCPD_STACK_SIZE		20480
  #define DHCPD_SCHED_PRI			100
  #define DHCPD_SCHED_POLICY		SCHED_RR
  
  #define OK       0
  #define ERR     -1
  
  /****************************************************************************
  * Private Data
  ****************************************************************************/
  /****************************************************************************
  * Global Data
  ****************************************************************************/
  /****************************************************************************
  * Private Functions
  ****************************************************************************/
  /****************************************************************************
  * Name: show_usage
  ****************************************************************************/
  
  static void show_usage(void)
  {
  	printf("\n");
  	printf("Usage: dhcpd <command> [interface name]\n");
  	printf("\nWhere:\n");
  	printf("	<command>		command string (start | stop | status ) \n");
  	printf("					 - start  : start dhcpd daemon \n");
  	printf("					 - stop   : terminate dhcpd daemon \n");
  	printf("					 - status : show dhcpd's status \n");
  	printf("	[interface name] name of network interface used for running dhcpd  \n");
  	printf("\n");
  
  }
  
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  /****************************************************************************
   * Name: cmd_dhcpd
   ****************************************************************************/
  
  int cmd_dhcpd(int argc, char *argv[])
  {
  	int result = OK;
  	uint8_t flags;
  
  	if (argc < 2) {
  		show_usage();
  		goto done;
  	}
  
  	if (!strcmp(argv[1], "start")) {
  		if (argc < 3) {
  			printf("ERROR : %s insert [interface name]\n", __FUNCTION__);
  			show_usage();
  			goto done;
  		}
  
  		if (dhcp_server_status(argv[2])) {
  			printf("ERROR : %s, dhcpd is already running\n", __FUNCTION__);
  			result = ERR;
  			goto done;
  		}
  
  		if (netlib_getifstatus(argv[2], &flags) == ERROR) {
  			printf("ERROR : %s, failed to get interface status\n", __FUNCTION__);
  			result = ERR;
  			goto done;
  		} else {
  			if (flags & IFF_UP) {
  				printf("%s : dhcp server start on %s\n", __FUNCTION__, argv[2]);
  			} else {
  				printf("%s : interface %s is down, unable to run dhcpd\n", __FUNCTION__, argv[2]);
  				result = ERR;
  				goto done;
  			}
  		}
  
  		if (dhcp_server_start(argv[2], NULL) != 0) {
  			printf("%s : failed to start dhcp server\n", __FUNCTION__);
  			goto done;
  		}
  	} else if (!strcmp(argv[1], "stop")) {
  		printf("%s : dhcp server stop\n", __FUNCTION__);
  		dhcp_server_stop(argv[2]);
  	} else if (!strcmp(argv[1], "status")) {
  		printf("\ndhcpd status : ");
  		if (dhcp_server_status(argv[2])) {
  			printf("running\n");
  		} else {
  			printf("stopped\n");
  		}
  	} else {
  		printf("ERROR : %s invalid <command> : %s\n", __FUNCTION__, argv[1]);
  		show_usage();
  		goto done;
  	}
  
  done:
  	return result;
  }
  #endif
  