/******************************************************************************
* Intel Management Engine Interface (Intel MEI) Linux driver
* Intel MEI Interface Header
*
* This file is provided under a dual BSD/GPLv2 license. When using or
* redistributing this file, you may do so under either license.
*
* GPL LICENSE SUMMARY
*
* Copyright(c) 2012 Intel Corporation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110,
* USA
*
* The full GNU General Public License is included in this distribution
* in the file called LICENSE.GPL.
*
* Contact Information:
* Intel Corporation.
* [email protected]
* http://www.intel.com
*
* BSD LICENSE
*
* Copyright(c) 2003 - 2012 Intel Corporation. All rights reserved.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <errno.h>
#include <stdint.h>
#include <stdbool.h>
#include <bits/wordsize.h>
#include <linux/mei.h>
/*****************************************************************************
* Intel Management Engine Interface
*****************************************************************************/
#define mei_msg(_me, fmt, ARGS...) do { \
if (_me->verbose) \
fprintf(stderr, fmt, ##ARGS); \
} while (0)
#define mei_err(_me, fmt, ARGS...) do { \
fprintf(stderr, "Error: " fmt, ##ARGS); \
} while (0)
struct mei {
uuid_le guid;
bool initialized;
bool verbose;
unsigned int buf_size;
unsigned char prot_ver;
int fd;
};
static void mei_deinit(struct mei *cl)
{
if (cl->fd != -1)
close(cl->fd);
cl->fd = -1;
cl->buf_size = 0;
cl->prot_ver = 0;
cl->initialized = false;
}
static bool mei_init(struct mei *me, const uuid_le *guid,
unsigned char req_protocol_version, bool verbose)
{
int result;
struct mei_client *cl;
struct mei_connect_client_data data;
me->verbose = verbose;
me->fd = open("/dev/mei0", O_RDWR);
if (me->fd == -1) {
mei_err(me, "Cannot establish a handle to the Intel MEI driver\n");
goto err;
}
memcpy(&me->guid, guid, sizeof(*guid));
memset(&data, 0, sizeof(data));
me->initialized = true;
memcpy(&data.in_client_uuid, &me->guid, sizeof(me->guid));
result = ioctl(me->fd, IOCTL_MEI_CONNECT_CLIENT, &data);
if (result) {
mei_err(me, "IOCTL_MEI_CONNECT_CLIENT receive message. err=%d\n", result);
goto err;
}
cl = &data.out_client_properties;
mei_msg(me, "max_message_length %d\n", cl->max_msg_length);
mei_msg(me, "protocol_version %d\n", cl->protocol_version);
if ((req_protocol_version > 0) &&
(cl->protocol_version != req_protocol_version)) {
mei_err(me, "Intel MEI protocol version not supported\n");
goto err;
}
me->buf_size = cl->max_msg_length;
me->prot_ver = cl->protocol_version;
return true;
err:
mei_deinit(me);
return false;
}
static ssize_t mei_recv_msg(struct mei *me, unsigned char *buffer,
ssize_t len, unsigned long timeout)
{
struct timeval tv;
fd_set set;
ssize_t rc;
tv.tv_sec = timeout / 1000;
tv.tv_usec = (timeout % 1000) * 1000000;
mei_msg(me, "call read length = %zd\n", len);
FD_ZERO(&set);
FD_SET(me->fd, &set);
rc = select(me->fd + 1, &set, NULL, NULL, &tv);
if (rc > 0 && FD_ISSET(me->fd, &set)) {
mei_msg(me, "have reply\n");
} else if (rc == 0) {
rc = -1;
mei_err(me, "read failed on timeout\n");
goto out;
} else { /* rc < 0 */
rc = errno;
mei_err(me, "read failed on select with status %zd %s\n",
rc, strerror(errno));
goto out;
}
rc = read(me->fd, buffer, len);
if (rc < 0) {
mei_err(me, "read failed with status %zd %s\n",
rc, strerror(errno));
goto out;
}
mei_msg(me, "read succeeded with result %zd\n", rc);
out:
if (rc < 0)
mei_deinit(me);
return rc;
}
static ssize_t mei_send_msg(struct mei *me, const unsigned char *buffer,
ssize_t len, unsigned long timeout)
{
ssize_t written;
ssize_t rc;
mei_msg(me, "call write length = %zd\n", len);
written = write(me->fd, buffer, len);
if (written < 0) {
rc = -errno;
mei_err(me, "write failed with status %zd %s\n",
written, strerror(errno));
goto out;
}
mei_msg(me, "write success\n");
rc = written;
out:
if (rc < 0)
mei_deinit(me);
return rc;
}
/***************************************************************************
* Intel Advanced Management Technology ME Client
***************************************************************************/
#define AMT_MAJOR_VERSION 1
#define AMT_MINOR_VERSION 1
#define AMT_STATUS_SUCCESS 0x0
#define AMT_STATUS_INTERNAL_ERROR 0x1
#define AMT_STATUS_NOT_READY 0x2
#define AMT_STATUS_INVALID_AMT_MODE 0x3
#define AMT_STATUS_INVALID_MESSAGE_LENGTH 0x4
#define AMT_STATUS_HOST_IF_EMPTY_RESPONSE 0x4000
#define AMT_STATUS_SDK_RESOURCES 0x1004
#define AMT_BIOS_VERSION_LEN 65
#define AMT_VERSIONS_NUMBER 50
#define AMT_UNICODE_STRING_LEN 20
struct amt_unicode_string {
uint16_t length;
char string[AMT_UNICODE_STRING_LEN];
} __attribute__((packed));
struct amt_version_type {
struct amt_unicode_string description;
struct amt_unicode_string version;
} __attribute__((packed));
struct amt_version {
uint8_t major;
uint8_t minor;
} __attribute__((packed));
struct amt_code_versions {
uint8_t bios[AMT_BIOS_VERSION_LEN];
uint32_t count;
struct amt_version_type versions[AMT_VERSIONS_NUMBER];
} __attribute__((packed));
/***************************************************************************
* Intel Advanced Management Technology Host Interface
***************************************************************************/
struct amt_host_if_msg_header {
struct amt_version version;
uint16_t _reserved;
uint32_t command;
uint32_t length;
} __attribute__((packed));
struct amt_host_if_resp_header {
struct amt_host_if_msg_header header;
uint32_t status;
unsigned char data[];
} __attribute__((packed));
const uuid_le MEI_IAMTHIF = UUID_LE(0x12f80028, 0xb4b7, 0x4b2d, \
0xac, 0xa8, 0x46, 0xe0, 0xff, 0x65, 0x81, 0x4c);
#define AMT_HOST_IF_CODE_VERSIONS_REQUEST 0x0400001A
#define AMT_HOST_IF_CODE_VERSIONS_RESPONSE 0x0480001A
const struct amt_host_if_msg_header CODE_VERSION_REQ = {
.version = {AMT_MAJOR_VERSION, AMT_MINOR_VERSION},
._reserved = 0,
.command = AMT_HOST_IF_CODE_VERSIONS_REQUEST,
.length = 0
};
struct amt_host_if {
struct mei mei_cl;
unsigned long send_timeout;
bool initialized;
};
static bool amt_host_if_init(struct amt_host_if *acmd,
unsigned long send_timeout, bool verbose)
{
acmd->send_timeout = (send_timeout) ? send_timeout : 20000;
acmd->initialized = mei_init(&acmd->mei_cl, &MEI_IAMTHIF, 0, verbose);
return acmd->initialized;
}
static void amt_host_if_deinit(struct amt_host_if *acmd)
{
mei_deinit(&acmd->mei_cl);
acmd->initialized = false;
}
static uint32_t amt_verify_code_versions(const struct amt_host_if_resp_header *resp)
{
uint32_t status = AMT_STATUS_SUCCESS;
struct amt_code_versions *code_ver;
size_t code_ver_len;
uint32_t ver_type_cnt;
uint32_t len;
uint32_t i;
code_ver = (struct amt_code_versions *)resp->data;
/* length - sizeof(status) */
code_ver_len = resp->header.length - sizeof(uint32_t);
ver_type_cnt = code_ver_len -
sizeof(code_ver->bios) -
sizeof(code_ver->count);
if (code_ver->count != ver_type_cnt / sizeof(struct amt_version_type)) {
status = AMT_STATUS_INTERNAL_ERROR;
goto out;
}
for (i = 0; i < code_ver->count; i++) {
len = code_ver->versions[i].description.length;
if (len > AMT_UNICODE_STRING_LEN) {
status = AMT_STATUS_INTERNAL_ERROR;
goto out;
}
len = code_ver->versions[i].version.length;
if (code_ver->versions[i].version.string[len] != '\0' ||
len != strlen(code_ver->versions[i].version.string)) {
status = AMT_STATUS_INTERNAL_ERROR;
goto out;
}
}
out:
return status;
}
static uint32_t amt_verify_response_header(uint32_t command,
const struct amt_host_if_msg_header *resp_hdr,
uint32_t response_size)
{
if (response_size < sizeof(struct amt_host_if_resp_header)) {
return AMT_STATUS_INTERNAL_ERROR;
} else if (response_size != (resp_hdr->length +
sizeof(struct amt_host_if_msg_header))) {
return AMT_STATUS_INTERNAL_ERROR;
} else if (resp_hdr->command != command) {
return AMT_STATUS_INTERNAL_ERROR;
} else if (resp_hdr->_reserved != 0) {
return AMT_STATUS_INTERNAL_ERROR;
} else if (resp_hdr->version.major != AMT_MAJOR_VERSION ||
resp_hdr->version.minor < AMT_MINOR_VERSION) {
return AMT_STATUS_INTERNAL_ERROR;
}
return AMT_STATUS_SUCCESS;
}
static uint32_t amt_host_if_call(struct amt_host_if *acmd,
const unsigned char *command, ssize_t command_sz,
uint8_t **read_buf, uint32_t rcmd,
unsigned int expected_sz)
{
uint32_t in_buf_sz;
ssize_t out_buf_sz;
ssize_t written;
uint32_t status;
struct amt_host_if_resp_header *msg_hdr;
in_buf_sz = acmd->mei_cl.buf_size;
*read_buf = (uint8_t *)malloc(sizeof(uint8_t) * in_buf_sz);
if (*read_buf == NULL)
return AMT_STATUS_SDK_RESOURCES;
memset(*read_buf, 0, in_buf_sz);
msg_hdr = (struct amt_host_if_resp_header *)*read_buf;
written = mei_send_msg(&acmd->mei_cl,
command, command_sz, acmd->send_timeout);
if (written != command_sz)
return AMT_STATUS_INTERNAL_ERROR;
out_buf_sz = mei_recv_msg(&acmd->mei_cl, *read_buf, in_buf_sz, 2000);
if (out_buf_sz <= 0)
return AMT_STATUS_HOST_IF_EMPTY_RESPONSE;
status = msg_hdr->status;
if (status != AMT_STATUS_SUCCESS)
return status;
status = amt_verify_response_header(rcmd,
&msg_hdr->header, out_buf_sz);
if (status != AMT_STATUS_SUCCESS)
return status;
if (expected_sz && expected_sz != out_buf_sz)
return AMT_STATUS_INTERNAL_ERROR;
return AMT_STATUS_SUCCESS;
}
static uint32_t amt_get_code_versions(struct amt_host_if *cmd,
struct amt_code_versions *versions)
{
struct amt_host_if_resp_header *response = NULL;
uint32_t status;
status = amt_host_if_call(cmd,
(const unsigned char *)&CODE_VERSION_REQ,
sizeof(CODE_VERSION_REQ),
(uint8_t **)&response,
AMT_HOST_IF_CODE_VERSIONS_RESPONSE, 0);
if (status != AMT_STATUS_SUCCESS)
goto out;
status = amt_verify_code_versions(response);
if (status != AMT_STATUS_SUCCESS)
goto out;
memcpy(versions, response->data, sizeof(struct amt_code_versions));
out:
if (response != NULL)
free(response);
return status;
}
/************************** end of amt_host_if_command ***********************/
int main(int argc, char **argv)
{
struct amt_code_versions ver;
struct amt_host_if acmd;
unsigned int i;
uint32_t status;
int ret;
bool verbose;
verbose = (argc > 1 && strcmp(argv[1], "-v") == 0);
if (!amt_host_if_init(&acmd, 5000, verbose)) {
ret = 1;
goto out;
}
status = amt_get_code_versions(&acmd, &ver);
amt_host_if_deinit(&acmd);
switch (status) {
case AMT_STATUS_HOST_IF_EMPTY_RESPONSE:
printf("Intel AMT: DISABLED\n");
ret = 0;
break;
case AMT_STATUS_SUCCESS:
printf("Intel AMT: ENABLED\n");
for (i = 0; i < ver.count; i++) {
printf("%s:\t%s\n", ver.versions[i].description.string,
ver.versions[i].version.string);
}
ret = 0;
break;
default:
printf("An error has occurred\n");
ret = 1;
break;
}
out:
return ret;
}
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