Added dhcp() user-level command.

src/include/usr/dhcpmgmt.h

@@ -0,0 +1,14 @@
+#ifndef _USR_DHCPMGMT_H
+#define _USR_DHCPMGMT_H
+
+/** @file
+ *
+ * DHCP management
+ *
+ */
+
+struct net_device;
+
+int dhcp ( struct net_device *netdev );
+
+#endif /* _USR_DHCPMGMT_H */

src/usr/dhcpmgmt.c

@@ -0,0 +1,83 @@
+/*
+ * 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 <byteswap.h>
+#include <vsprintf.h>
+#include <gpxe/in.h>
+#include <gpxe/dhcp.h>
+#include <gpxe/async.h>
+#include <gpxe/netdevice.h>
+#include <usr/dhcpmgmt.h>
+
+/** @file
+ *
+ * DHCP management
+ *
+ */
+
+/**
+ * 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 = { htonl ( 0 ) };
+	struct in_addr netmask = { htonl ( 0 ) };
+	struct in_addr gateway = { INADDR_NONE };
+	int rc;
+
+	/* Free up any previously-acquired options */
+	if ( dhcp_options ) {
+		unregister_dhcp_options ( dhcp_options );
+		free_dhcp_options ( dhcp_options );
+		dhcp_options = NULL;
+	}
+
+	/* Issue DHCP request */
+	printf ( "DHCP (%s %s)...", netdev->name, netdev_hwaddr ( netdev ) );
+	memset ( &dhcp, 0, sizeof ( dhcp ) );
+	dhcp.netdev = netdev;
+	if ( ( rc = async_wait ( start_dhcp ( &dhcp ) ) ) != 0 ) {
+		printf ( "failed\n" );
+		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;
+	}
+
+	return 0;
+}