![Michael Brown](/assets/img/avatar_default.png)
Access to the gpxe.org and etherboot.org domains and associated resources has been revoked by the registrant of the domain. Work around this problem by renaming project from gPXE to iPXE, and updating URLs to match. Also update README, LOG and COPYRIGHTS to remove obsolete information. Signed-off-by: Michael Brown <mcb30@ipxe.org>
218 lines
5.5 KiB
C
218 lines
5.5 KiB
C
/*
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* Copyright (C) 2008 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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FILE_LICENCE ( GPL2_OR_LATER );
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#include <stdint.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <ipxe/settings.h>
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#include <ipxe/netdevice.h>
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#include <ipxe/dhcppkt.h>
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#include <ipxe/fakedhcp.h>
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/** @file
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*
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* Fake DHCP packets
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*
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*/
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/**
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* Copy settings to DHCP packet
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*
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* @v dest Destination DHCP packet
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* @v source Source settings block
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* @v encapsulator Encapsulating setting tag number, or zero
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* @ret rc Return status code
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*/
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static int copy_encap_settings ( struct dhcp_packet *dest,
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struct settings *source,
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unsigned int encapsulator ) {
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struct setting setting = { .name = "" };
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unsigned int subtag;
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unsigned int tag;
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int len;
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int check_len;
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int rc;
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for ( subtag = DHCP_MIN_OPTION; subtag <= DHCP_MAX_OPTION; subtag++ ) {
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tag = DHCP_ENCAP_OPT ( encapsulator, subtag );
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switch ( tag ) {
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case DHCP_EB_ENCAP:
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case DHCP_VENDOR_ENCAP:
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/* Process encapsulated settings */
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if ( ( rc = copy_encap_settings ( dest, source,
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tag ) ) != 0 )
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return rc;
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break;
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default:
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/* Copy setting, if present */
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setting.tag = tag;
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len = fetch_setting_len ( source, &setting );
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if ( len < 0 )
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break;
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{
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char buf[len];
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check_len = fetch_setting ( source, &setting,
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buf, sizeof (buf));
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assert ( check_len == len );
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if ( ( rc = dhcppkt_store ( dest, tag, buf,
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sizeof(buf) )) !=0)
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return rc;
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}
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break;
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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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* Copy settings to DHCP packet
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*
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* @v dest Destination DHCP packet
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* @v source Source settings block
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* @ret rc Return status code
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*/
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static int copy_settings ( struct dhcp_packet *dest,
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struct settings *source ) {
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return copy_encap_settings ( dest, source, 0 );
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}
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/**
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* Create fake DHCPDISCOVER packet
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*
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* @v netdev Network device
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* @v data Buffer for DHCP packet
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* @v max_len Size of DHCP packet buffer
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* @ret rc Return status code
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*
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* Used by external code.
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*/
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int create_fakedhcpdiscover ( struct net_device *netdev,
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void *data, size_t max_len ) {
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struct dhcp_packet dhcppkt;
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struct in_addr ciaddr = { 0 };
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int rc;
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if ( ( rc = dhcp_create_request ( &dhcppkt, netdev, DHCPDISCOVER,
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ciaddr, data, max_len ) ) != 0 ) {
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DBG ( "Could not create DHCPDISCOVER: %s\n",
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strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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/**
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* Create fake DHCPACK packet
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*
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* @v netdev Network device
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* @v data Buffer for DHCP packet
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* @v max_len Size of DHCP packet buffer
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* @ret rc Return status code
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*
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* Used by external code.
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*/
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int create_fakedhcpack ( struct net_device *netdev,
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void *data, size_t max_len ) {
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struct dhcp_packet dhcppkt;
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int rc;
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/* Create base DHCPACK packet */
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if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK, NULL, 0,
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data, max_len ) ) != 0 ) {
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DBG ( "Could not create DHCPACK: %s\n", strerror ( rc ) );
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return rc;
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}
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/* Merge in globally-scoped settings, then netdev-specific
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* settings. Do it in this order so that netdev-specific
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* settings take precedence regardless of stated priorities.
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*/
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if ( ( rc = copy_settings ( &dhcppkt, NULL ) ) != 0 ) {
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DBG ( "Could not set DHCPACK global settings: %s\n",
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strerror ( rc ) );
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return rc;
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}
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if ( ( rc = copy_settings ( &dhcppkt,
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netdev_settings ( netdev ) ) ) != 0 ) {
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DBG ( "Could not set DHCPACK netdev settings: %s\n",
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strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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/**
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* Create fake PXE Boot Server ACK packet
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*
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* @v netdev Network device
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* @v data Buffer for DHCP packet
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* @v max_len Size of DHCP packet buffer
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* @ret rc Return status code
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*
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* Used by external code.
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*/
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int create_fakepxebsack ( struct net_device *netdev,
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void *data, size_t max_len ) {
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struct dhcp_packet dhcppkt;
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struct settings *proxy_settings;
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struct settings *pxebs_settings;
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int rc;
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/* Identify available settings */
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proxy_settings = find_settings ( PROXYDHCP_SETTINGS_NAME );
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pxebs_settings = find_settings ( PXEBS_SETTINGS_NAME );
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if ( ( ! proxy_settings ) && ( ! pxebs_settings ) ) {
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/* No PXE boot server; return the regular DHCPACK */
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return create_fakedhcpack ( netdev, data, max_len );
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}
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/* Create base DHCPACK packet */
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if ( ( rc = dhcp_create_packet ( &dhcppkt, netdev, DHCPACK, NULL, 0,
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data, max_len ) ) != 0 ) {
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DBG ( "Could not create PXE BS ACK: %s\n",
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strerror ( rc ) );
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return rc;
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}
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/* Merge in ProxyDHCP options */
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if ( proxy_settings &&
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( ( rc = copy_settings ( &dhcppkt, proxy_settings ) ) != 0 ) ) {
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DBG ( "Could not copy ProxyDHCP settings: %s\n",
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strerror ( rc ) );
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return rc;
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}
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/* Merge in BootServerDHCP options, if present */
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if ( pxebs_settings &&
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( ( rc = copy_settings ( &dhcppkt, pxebs_settings ) ) != 0 ) ) {
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DBG ( "Could not copy PXE BS settings: %s\n",
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strerror ( rc ) );
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return rc;
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}
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return 0;
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}
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