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/*
* magic.c
* Copyright (c) 2012 Canonical LTD.
* Author: Justin L Werner <justin.werner@caononical.com>
* See: RFC 5071
*
* See file CREDITS for list of people who contributed to this
* project.
*
* 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 (at your option) 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <command.h>
#include <net.h>
#include "bootp.h"
#include <linux/compiler.h>
#if defined(CONFIG_BOOTP_VENDOREX) && defined(CONFIG_BOOTP_VENDOREX_PXE_SHARED)
#include "magic.h"
#define OPT_MAGIC 208
#define OPT_CONFIG_FILE 209
#define OPT_PATH_PREFIX 210
#define OPT_REBOOT_TIME 211
#define OPT_MAGIC_LEN 4
#define OPT_REBOOT_TIME_LEN 4
static const u8 opt_magic_string[] = {0xf1, 0x0, 0x74, 0x7e};
static int opt_magic_seen = 0;
static u8 opt_config_file_value[UCHAR_MAX + 1];
static u8 opt_path_prefix_value[UCHAR_MAX + 1];
static size_t opt_reboot_time = 0;
static u8 *parse_magic(u8 *);
static u8 *parse_config_file(u8 *);
static u8 *parse_path_prefix(u8 *);
static u8 *parse_reboot_time(u8 *);
/*
* Init/done processing any vendor extension options that we care
* about here. It is possible (at least in my env) for the PXE options
* processing to occur more than once.
*/
void
dhcp_vendorex_opts_done(void)
{
opt_magic_seen = 0;
memset(opt_config_file_value, 0, sizeof(opt_config_file_value));
memset(opt_path_prefix_value, 0, sizeof(opt_path_prefix_value));
opt_reboot_time = 0;
}
/*
* Add vendor option(s) to the request
* - add own opts and return e as ptr just beyond them
*
* For our common PXE MAGIC implementation, we don't add anything: it's a noop
*/
u8 *
dhcp_vendorex_prep (u8 *e)
{
return e;
}
/*
* Parse vendor options from a response
* - e points into the bp_vend[] array, which is OPT_SIZE
* returns next 'e' if recognized and accepted, NULL otherwise
*/
u8 *
dhcp_vendorex_proc (u8 *e)
{
switch (*e) {
case OPT_MAGIC:
printf("INFO: DHCP PXE vendorex PXE MAGIC option encountered\n");
e = parse_magic(++e);
break;
case OPT_CONFIG_FILE:
printf("INFO: DHCP PXE vendorex PXE ConfigFile option encountered\n");
e = parse_config_file(++e);
break;
case OPT_PATH_PREFIX:
printf("INFO: DHCP PXE vendorex PXE PathPrefix option encountered\n");
e = parse_path_prefix(++e);
break;
case OPT_REBOOT_TIME:
printf("INFO: DHCP PXE vendorex RebootTime option encountered\n");
e = parse_reboot_time(++e);
break;
default:
e = NULL;
break;
}
return e;
}
static u8 *
parse_magic(u8 *e)
{
size_t len = *e++;
if (opt_magic_seen) {
printf("INFO: DHCP PXE vendorex MAGIC option already seen\n");
}
if (len != OPT_MAGIC_LEN) {
e = NULL;
printf("ERROR: DHCP PXE vendorex MAGIC has invalid length [%u]\n", len);
} else if (memcmp(e, opt_magic_string, sizeof(opt_magic_string))) {
e = NULL;
opt_magic_seen = 0;
printf("ERROR: DHCP PXE vendorex MAGIC invalid magic value %02x:%02x:%02x:%02x\n",
(unsigned int) e[0], (unsigned int) e[1], (unsigned int) e[2], (unsigned int) e[3]);
} else {
e += sizeof(opt_magic_string);
opt_magic_seen = 1;
printf("INFO: DHCP PXE vendorex MAGIC confirmed\n");
}
return e;
}
static u8 *
parse_config_file(u8 *e)
{
size_t len = *e++;
if (! opt_magic_seen) {
printf("ERROR: DHCP PXE vendorex ConfigFile without MAGIC\n");
e = NULL;
} else if (len == 0) {
printf("WARNING: DHCP PXE vendorex ConfigFile string has zero length, ignoring\n");
} else {
memset(opt_config_file_value, 0, sizeof(opt_config_file_value));
memcpy(opt_config_file_value, e, len);
e += len;
opt_config_file_value[len] = 0;
setenv(PXE_CONFIG_FILE, (char *)opt_config_file_value);
printf("INFO: DHCP PXE vendorex ConfigFile is [%s]\n", opt_config_file_value);
}
return e;
}
static u8 *
parse_path_prefix(u8 *e)
{
size_t len = *e++;
if (! opt_magic_seen) {
printf("ERROR: DHCP PXE vendorex ConfigFile without MAGIC\n");
e = NULL;
} if (len == 0) {
printf("WARNING: DHCP PXE vendorex PathPrefix string has zero length, ignoring\n");
} else {
memset(opt_path_prefix_value, 0, sizeof(opt_path_prefix_value));
memcpy(opt_path_prefix_value, e, len);
e += len;
opt_path_prefix_value[len] = 0;
setenv(PXE_PATH_PREFIX, (char *)opt_path_prefix_value);
printf("INFO: DHCP PXE vendorex PathPrefix is [%s]\n", opt_path_prefix_value);
}
return e;
}
static u8 *
parse_reboot_time(u8 *e)
{
size_t len = *e++;
char bfr[12];
if (! opt_magic_seen) {
printf("ERROR: DHCP PXE vendorex ConfigFile without MAGIC\n");
e = NULL;
} else if (len != OPT_REBOOT_TIME_LEN) {
e += len;
printf("WARNING: DHCP PXE vendorex RebootTime has invalid length [%u], ignoring\n", len);
} else {
unsigned long value;
memcpy(&value, e, OPT_REBOOT_TIME_LEN);
opt_reboot_time = (size_t) ntohl(value);
e += OPT_REBOOT_TIME_LEN;
sprintf(bfr, "%u", opt_reboot_time);
setenv(PXE_REBOOT_TIME, bfr);
printf("INFO: DHCP PXE vendorex RebootTime is [%u]\n", opt_reboot_time);
#if defined(CONFIG_BOOT_RETRY_TIME)
if (opt_reboot_time < CONFIG_BOOT_RETRY_MIN) {
opt_reboot_time = CONFIG_BOOT_RETRY_MIN;
sprintf(bfr, "%u", opt_reboot_time);
setenv(PXE_REBOOT_TIME, bfr);
printf("INFO: DHCP PXE vendorex RebootTime adjusted up to allowable minimum value [%d]\n",
CONFIG_BOOT_RETRY_MIN);
}
reset_cmd_timeout();
#else
printf("INFO: DHCP PXE vendorex RebootTime is N/A and ignored due to u-boot configs\n");
#endif
}
return e;
}
#else
const int no_arm_vendorex_options = 1;
#endif
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