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 static const char* trusty_device_name = "/dev/trusty-ipc-dev0";
32 static int handle_ = 0;
33
trusty_gatekeeper_set_dev_name(const char * device_name)34 void trusty_gatekeeper_set_dev_name(const char* device_name) {
35 trusty_device_name = device_name;
36 }
37
trusty_gatekeeper_connect()38 int trusty_gatekeeper_connect() {
39 int rc = tipc_connect(trusty_device_name, GATEKEEPER_PORT);
40 if (rc < 0) {
41 return rc;
42 }
43
44 handle_ = rc;
45 return 0;
46 }
47
trusty_gatekeeper_call(uint32_t cmd,void * in,uint32_t in_size,uint8_t * out,uint32_t * out_size)48 int trusty_gatekeeper_call(uint32_t cmd, void *in, uint32_t in_size, uint8_t *out,
49 uint32_t *out_size) {
50 if (handle_ == 0) {
51 ALOGE("not connected\n");
52 return -EINVAL;
53 }
54
55 size_t msg_size = in_size + sizeof(struct gatekeeper_message);
56 struct gatekeeper_message *msg = malloc(msg_size);
57 msg->cmd = cmd;
58 memcpy(msg->payload, in, in_size);
59
60 ssize_t rc = write(handle_, msg, msg_size);
61 free(msg);
62
63 if (rc < 0) {
64 ALOGE("failed to send cmd (%d) to %s: %s\n", cmd,
65 GATEKEEPER_PORT, strerror(errno));
66 return -errno;
67 }
68
69 rc = read(handle_, out, *out_size);
70 if (rc < 0) {
71 ALOGE("failed to retrieve response for cmd (%d) to %s: %s\n",
72 cmd, GATEKEEPER_PORT, strerror(errno));
73 return -errno;
74 }
75
76 if ((size_t) rc < sizeof(struct gatekeeper_message)) {
77 ALOGE("invalid response size (%d)\n", (int) rc);
78 return -EINVAL;
79 }
80
81 msg = (struct gatekeeper_message *) out;
82
83 if ((cmd | GK_RESP_BIT) != msg->cmd) {
84 ALOGE("invalid command (%d)\n", msg->cmd);
85 return -EINVAL;
86 }
87
88 *out_size = ((size_t) rc) - sizeof(struct gatekeeper_message);
89 return rc;
90 }
91
trusty_gatekeeper_disconnect()92 void trusty_gatekeeper_disconnect() {
93 if (handle_ != 0) {
94 tipc_close(handle_);
95 }
96 }
97
98