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 30 static int handle_ = 0; 31 32 int 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 42 int 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 86 void trusty_gatekeeper_disconnect() { 87 if (handle_ != 0) { 88 tipc_close(handle_); 89 } 90 } 91 92
