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
