103 lines
2.8 KiB
C
103 lines
2.8 KiB
C
/*
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* Copyright (C) 2007 Michael Brown <mbrown@fensystems.co.uk>.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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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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*/
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#include <string.h>
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#include <stdio.h>
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#include <byteswap.h>
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#include <gpxe/in.h>
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#include <gpxe/ip.h>
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#include <gpxe/dhcp.h>
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#include <gpxe/async.h>
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#include <gpxe/netdevice.h>
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#include <gpxe/dns.h>
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#include <usr/ifmgmt.h>
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#include <usr/dhcpmgmt.h>
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/** @file
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*
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* DHCP management
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*
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*/
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/* Avoid dragging in dns.o */
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struct in_addr nameserver;
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/**
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* Configure network device via DHCP
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*
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* @v netdev Network device
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* @ret rc Return status code
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*/
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int dhcp ( struct net_device *netdev ) {
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static struct dhcp_option_block *dhcp_options = NULL;
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struct dhcp_session dhcp;
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struct in_addr address = { 0 };
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struct in_addr netmask = { 0 };
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struct in_addr gateway = { INADDR_NONE };
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struct async async;
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int rc;
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/* Check we can open the interface first */
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if ( ( rc = ifopen ( netdev ) ) != 0 )
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return rc;
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/* Free up any previously-acquired options */
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if ( dhcp_options ) {
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unregister_dhcp_options ( dhcp_options );
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free_dhcp_options ( dhcp_options );
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dhcp_options = NULL;
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}
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/* Clear any existing routing table entry */
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del_ipv4_address ( netdev );
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/* Issue DHCP request */
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printf ( "DHCP (%s %s)...", netdev->name, netdev_hwaddr ( netdev ) );
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memset ( &dhcp, 0, sizeof ( dhcp ) );
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dhcp.netdev = netdev;
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if ( ( rc = async_block ( &async,
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start_dhcp ( &dhcp, &async ) ) ) != 0 ) {
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printf ( "failed (%s)\n", strerror ( rc ) );
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return rc;
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}
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printf ( "done\n" );
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/* Store and register options */
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dhcp_options = dhcp.options;
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register_dhcp_options ( dhcp_options );
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/* Retrieve IP address configuration */
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find_dhcp_ipv4_option ( dhcp_options, DHCP_EB_YIADDR, &address );
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find_dhcp_ipv4_option ( dhcp_options, DHCP_SUBNET_MASK, &netmask );
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find_dhcp_ipv4_option ( dhcp_options, DHCP_ROUTERS, &gateway );
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/* Set up new IP address configuration */
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if ( ( rc = add_ipv4_address ( netdev, address, netmask,
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gateway ) ) != 0 ) {
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printf ( "Could not configure %s with DHCP results: %s\n",
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netdev->name, strerror ( rc ) );
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return rc;
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}
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/* Retrieve other DHCP options that we care about */
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find_dhcp_ipv4_option ( dhcp_options, DHCP_DNS_SERVERS,
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&nameserver );
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return 0;
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}
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