1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#define LOG_TAG "TrustyGateKeeper"
18
19#include <errno.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
24
25#include <log/log.h>
26#include <trusty/tipc.h>
27
28#include "trusty_gatekeeper_ipc.h"
29#include "gatekeeper_ipc.h"
30
31#define TRUSTY_DEVICE_NAME "/dev/trusty-ipc-dev0"
32
33static int handle_ = 0;
34
35int trusty_gatekeeper_connect() {
36    int rc = tipc_connect(TRUSTY_DEVICE_NAME, GATEKEEPER_PORT);
37    if (rc < 0) {
38        return rc;
39    }
40
41    handle_ = rc;
42    return 0;
43}
44
45int trusty_gatekeeper_call(uint32_t cmd, void *in, uint32_t in_size, uint8_t *out,
46                           uint32_t *out_size) {
47    if (handle_ == 0) {
48        ALOGE("not connected\n");
49        return -EINVAL;
50    }
51
52    size_t msg_size = in_size + sizeof(struct gatekeeper_message);
53    struct gatekeeper_message *msg = malloc(msg_size);
54    msg->cmd = cmd;
55    memcpy(msg->payload, in, in_size);
56
57    ssize_t rc = write(handle_, msg, msg_size);
58    free(msg);
59
60    if (rc < 0) {
61        ALOGE("failed to send cmd (%d) to %s: %s\n", cmd,
62                GATEKEEPER_PORT, strerror(errno));
63        return -errno;
64    }
65
66    rc = read(handle_, out, *out_size);
67    if (rc < 0) {
68        ALOGE("failed to retrieve response for cmd (%d) to %s: %s\n",
69                cmd, GATEKEEPER_PORT, strerror(errno));
70        return -errno;
71    }
72
73    if ((size_t) rc < sizeof(struct gatekeeper_message)) {
74        ALOGE("invalid response size (%d)\n", (int) rc);
75        return -EINVAL;
76    }
77
78    msg = (struct gatekeeper_message *) out;
79
80    if ((cmd | GK_RESP_BIT) != msg->cmd) {
81        ALOGE("invalid command (%d)\n", msg->cmd);
82        return -EINVAL;
83    }
84
85    *out_size = ((size_t) rc) - sizeof(struct gatekeeper_message);
86    return rc;
87}
88
89void trusty_gatekeeper_disconnect() {
90    if (handle_ != 0) {
91        tipc_close(handle_);
92    }
93}
94
95