/*
* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
*
* 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 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.
*/
#include <string.h>
#include <stdio.h>
#include <byteswap.h>
#include <gpxe/in.h>
#include <gpxe/ip.h>
#include <gpxe/dhcp.h>
#include <gpxe/async.h>
#include <gpxe/netdevice.h>
#include <gpxe/dns.h>
#include <usr/ifmgmt.h>
#include <usr/dhcpmgmt.h>
/** @file
*
* DHCP management
*
*/
/* Avoid dragging in dns.o */
struct sockaddr_tcpip nameserver;
/* Avoid dragging in syslog.o */
struct in_addr syslogserver;
/**
* Configure network device via DHCP
*
* @v netdev Network device
* @ret rc Return status code
*/
int dhcp ( struct net_device *netdev ) {
static struct dhcp_option_block *dhcp_options = NULL;
struct dhcp_session dhcp;
struct in_addr address = { 0 };
struct in_addr netmask = { 0 };
struct in_addr gateway = { INADDR_NONE };
struct sockaddr_in *sin_nameserver;
struct async async;
int rc;
/* Check we can open the interface first */
if ( ( rc = ifopen ( netdev ) ) != 0 )
return rc;
/* Free up any previously-acquired options */
if ( dhcp_options ) {
unregister_dhcp_options ( dhcp_options );
free_dhcp_options ( dhcp_options );
dhcp_options = NULL;
}
/* Clear any existing routing table entry */
del_ipv4_address ( netdev );
/* Issue DHCP request */
printf ( "DHCP (%s %s)...", netdev->name, netdev_hwaddr ( netdev ) );
memset ( &dhcp, 0, sizeof ( dhcp ) );
dhcp.netdev = netdev;
if ( ( rc = async_block ( &async,
start_dhcp ( &dhcp, &async ) ) ) != 0 ) {
printf ( "failed (%s)\n", strerror ( rc ) );
return rc;
}
printf ( "done\n" );
/* Store and register options */
dhcp_options = dhcp.options;
register_dhcp_options ( dhcp_options );
/* Retrieve IP address configuration */
find_dhcp_ipv4_option ( dhcp_options, DHCP_EB_YIADDR, &address );
find_dhcp_ipv4_option ( dhcp_options, DHCP_SUBNET_MASK, &netmask );
find_dhcp_ipv4_option ( dhcp_options, DHCP_ROUTERS, &gateway );
/* Set up new IP address configuration */
if ( ( rc = add_ipv4_address ( netdev, address, netmask,
gateway ) ) != 0 ) {
printf ( "Could not configure %s with DHCP results: %s\n",
netdev->name, strerror ( rc ) );
return rc;
}
/* Retrieve other DHCP options that we care about */
sin_nameserver = ( struct sockaddr_in * ) &nameserver;
sin_nameserver->sin_family = AF_INET;
find_dhcp_ipv4_option ( dhcp_options, DHCP_DNS_SERVERS,
&sin_nameserver->sin_addr );
find_dhcp_ipv4_option ( dhcp_options, DHCP_LOG_SERVERS,
&syslogserver );
return 0;
}
