Michael Ryleev | 7a2bc37 | 2016-03-08 15:16:11 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2016 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 | #include <assert.h> |
| 17 | #include <errno.h> |
| 18 | #include <stdbool.h> |
| 19 | #include <stdint.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <sys/uio.h> |
| 23 | |
| 24 | #include <trusty/tipc.h> |
| 25 | |
| 26 | #include "ipc.h" |
| 27 | #include "log.h" |
| 28 | |
| 29 | #define MAX_RECONNECT_RETRY_COUNT 5 |
| 30 | #define TRUSTY_RECONNECT_TIMEOUT_SEC 5 |
| 31 | |
| 32 | static int tipc_fd = -1; |
| 33 | |
| 34 | int ipc_connect(const char *device, const char *port) |
| 35 | { |
| 36 | int rc; |
| 37 | uint retry_cnt = 0; |
| 38 | |
| 39 | assert(tipc_fd == -1); |
| 40 | |
| 41 | while(true) { |
| 42 | rc = tipc_connect(device, port); |
| 43 | if (rc >= 0) |
| 44 | break; |
| 45 | |
| 46 | ALOGE("failed (%d) to connect to storage server\n", rc); |
| 47 | if (++retry_cnt > MAX_RECONNECT_RETRY_COUNT) { |
| 48 | ALOGE("max number of reconnect retries (%d) has been reached\n", |
| 49 | retry_cnt); |
| 50 | return -1; |
| 51 | } |
| 52 | sleep(TRUSTY_RECONNECT_TIMEOUT_SEC); |
| 53 | } |
| 54 | tipc_fd = rc; |
| 55 | return 0; |
| 56 | } |
| 57 | |
| 58 | void ipc_disconnect(void) |
| 59 | { |
| 60 | assert(tipc_fd >= 0); |
| 61 | |
| 62 | tipc_close(tipc_fd); |
| 63 | tipc_fd = -1; |
| 64 | } |
| 65 | |
| 66 | ssize_t ipc_get_msg(struct storage_msg *msg, void *req_buf, size_t req_buf_len) |
| 67 | { |
| 68 | ssize_t rc; |
| 69 | struct iovec iovs[2] = {{msg, sizeof(*msg)}, {req_buf, req_buf_len}}; |
| 70 | |
| 71 | assert(tipc_fd >= 0); |
| 72 | |
| 73 | rc = readv(tipc_fd, iovs, 2); |
| 74 | if (rc < 0) { |
| 75 | ALOGE("failed to read request: %s\n", strerror(errno)); |
| 76 | return rc; |
| 77 | } |
| 78 | |
| 79 | /* check for minimum size */ |
| 80 | if ((size_t)rc < sizeof(*msg)) { |
| 81 | ALOGE("message is too short (%zu bytes received)\n", rc); |
| 82 | return -1; |
| 83 | } |
| 84 | |
| 85 | /* check for message completeness */ |
| 86 | if (msg->size != (uint32_t)rc) { |
| 87 | ALOGE("inconsistent message size [cmd=%d] (%u != %u)\n", |
| 88 | msg->cmd, msg->size, (uint32_t)rc); |
| 89 | return -1; |
| 90 | } |
| 91 | |
| 92 | return rc - sizeof(*msg); |
| 93 | } |
| 94 | |
| 95 | int ipc_respond(struct storage_msg *msg, void *out, size_t out_size) |
| 96 | { |
| 97 | ssize_t rc; |
| 98 | struct iovec iovs[2] = {{msg, sizeof(*msg)}, {out, out_size}}; |
| 99 | |
| 100 | assert(tipc_fd >= 0); |
| 101 | |
| 102 | msg->cmd |= STORAGE_RESP_BIT; |
| 103 | |
| 104 | rc = writev(tipc_fd, iovs, out ? 2 : 1); |
| 105 | if (rc < 0) { |
| 106 | ALOGE("error sending response 0x%x: %s\n", |
| 107 | msg->cmd, strerror(errno)); |
| 108 | return -1; |
| 109 | } |
| 110 | |
| 111 | return 0; |
| 112 | } |
| 113 | |
| 114 | |