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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "spiproxyd"
#include <assert.h>
#include <fcntl.h>
#include <getopt.h>
#include <log/log.h>
#include <stdlib.h>
#include <string.h>
#include <trusty/tipc.h>
#include <unistd.h>
int handle_msg(int trusty_dev_fd, int spi_dev_fd) {
int rc;
uint8_t msg_buf[4096];
size_t msg_len;
/* read request from SPI Trusty app */
rc = read(trusty_dev_fd, &msg_buf, sizeof(msg_buf));
if (rc < 0) {
ALOGE("failed (%d) to read request from TA\n", rc);
return rc;
}
msg_len = rc;
/* forward request to SPI host device */
rc = write(spi_dev_fd, &msg_buf, msg_len);
if (rc < 0 || (size_t)rc != msg_len) {
ALOGE("failed (%d) to forward request to host\n", rc);
return rc < 0 ? rc : -1;
}
/* read response from SPI host device */
rc = read(spi_dev_fd, &msg_buf, sizeof(msg_buf));
if (rc < 0) {
ALOGE("failed (%d) to read response from host\n", rc);
return rc;
}
msg_len = rc;
/* forward response to SPI Trusty app */
rc = write(trusty_dev_fd, &msg_buf, msg_len);
if (rc < 0 || (size_t)rc != msg_len) {
ALOGE("failed (%d) to forward response to TA\n", rc);
return rc < 0 ? rc : -1;
}
return 0;
}
int event_loop(int trusty_dev_fd, int spi_dev_fd) {
while (true) {
int rc = handle_msg(trusty_dev_fd, spi_dev_fd);
if (rc < 0) {
ALOGE("exiting event loop\n");
return EXIT_FAILURE;
}
}
}
static void show_usage() {
ALOGE("usage: spiproxyd -t TRUSTY_DEVICE -s SPI_DEVICE -p SPI_PROXY_PORT\n");
}
static void parse_args(int argc, char* argv[], const char** trusty_dev_name,
const char** spi_dev_name, const char** spi_proxy_port) {
int opt;
while ((opt = getopt(argc, argv, "ht:s:p:")) != -1) {
switch (opt) {
case 'h':
show_usage();
exit(EXIT_SUCCESS);
break;
case 't':
*trusty_dev_name = strdup(optarg);
break;
case 's':
*spi_dev_name = strdup(optarg);
break;
case 'p':
*spi_proxy_port = strdup(optarg);
break;
default:
show_usage();
exit(EXIT_FAILURE);
break;
}
}
if (!*trusty_dev_name || !*spi_dev_name || !*spi_proxy_port) {
show_usage();
exit(EXIT_FAILURE);
}
}
int main(int argc, char* argv[]) {
int rc;
const char* trusty_dev_name = NULL;
const char* spi_dev_name = NULL;
const char* spi_proxy_port = NULL;
int trusty_dev_fd;
int spi_dev_fd;
parse_args(argc, argv, &trusty_dev_name, &spi_dev_name, &spi_proxy_port);
rc = tipc_connect(trusty_dev_name, spi_proxy_port);
if (rc < 0) {
ALOGE("failed (%d) to connect to SPI proxy port\n", rc);
return rc;
}
trusty_dev_fd = rc;
rc = open(spi_dev_name, O_RDWR, 0);
if (rc < 0) {
ALOGE("failed (%d) to open SPI device\n", rc);
return rc;
}
spi_dev_fd = rc;
return event_loop(trusty_dev_fd, spi_dev_fd);
}
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