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#include <errno.h>
18#include <stdlib.h>
19#include <string.h>
20
21#define LOG_TAG "TrustyGateKeeper"
22#include <cutils/log.h>
23#include <trusty/tipc.h>
24
25#include "trusty_gatekeeper_ipc.h"
26#include "gatekeeper_ipc.h"
27
28#define TRUSTY_DEVICE_NAME "/dev/trusty-ipc-dev0"
29
30static int handle_ = 0;
31
32int trusty_gatekeeper_connect() {
33    int rc = tipc_connect(TRUSTY_DEVICE_NAME, GATEKEEPER_PORT);
34    if (rc < 0) {
35        return rc;
36    }
37
38    handle_ = rc;
39    return 0;
40}
41
42int trusty_gatekeeper_call(uint32_t cmd, void *in, uint32_t in_size, uint8_t *out,
43                           uint32_t *out_size) {
44    if (handle_ == 0) {
45        ALOGE("not connected\n");
46        return -EINVAL;
47    }
48
49    size_t msg_size = in_size + sizeof(struct gatekeeper_message);
50    struct gatekeeper_message *msg = malloc(msg_size);
51    msg->cmd = cmd;
52    memcpy(msg->payload, in, in_size);
53
54    ssize_t rc = write(handle_, msg, msg_size);
55    free(msg);
56
57    if (rc < 0) {
58        ALOGE("failed to send cmd (%d) to %s: %s\n", cmd,
59                GATEKEEPER_PORT, strerror(errno));
60        return -errno;
61    }
62
63    rc = read(handle_, out, *out_size);
64    if (rc < 0) {
65        ALOGE("failed to retrieve response for cmd (%d) to %s: %s\n",
66                cmd, GATEKEEPER_PORT, strerror(errno));
67        return -errno;
68    }
69
70    if ((size_t) rc < sizeof(struct gatekeeper_message)) {
71        ALOGE("invalid response size (%d)\n", (int) rc);
72        return -EINVAL;
73    }
74
75    msg = (struct gatekeeper_message *) out;
76
77    if ((cmd | GK_RESP_BIT) != msg->cmd) {
78        ALOGE("invalid command (%d)\n", msg->cmd);
79        return -EINVAL;
80    }
81
82    *out_size = ((size_t) rc) - sizeof(struct gatekeeper_message);
83    return rc;
84}
85
86void trusty_gatekeeper_disconnect() {
87    if (handle_ != 0) {
88        tipc_close(handle_);
89    }
90}
91
92