path: root/trusty/trusty_gatekeeper_ipc.c (plain)
blob: f67944b35de65838a42736dd6e22cd1537349cb2

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
33	static int handle_ = 0;
34
35	int 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
45	int 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
89	void trusty_gatekeeper_disconnect() {
90	if (handle_ != 0) {
91	tipc_close(handle_);
92	}
93	}
94
95