Michael Ryleev | abebb89 | 2016-03-23 16:25:05 -0700 | [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 | |
| 17 | #include <errno.h> |
| 18 | #include <stdarg.h> |
| 19 | #include <stdbool.h> |
| 20 | #include <stdint.h> |
| 21 | #include <string.h> |
| 22 | #include <sys/uio.h> |
| 23 | |
| 24 | #include <trusty/tipc.h> |
| 25 | #include <trusty/lib/storage.h> |
| 26 | |
| 27 | #define LOG_TAG "trusty_storage_client" |
| 28 | #include <cutils/log.h> |
| 29 | |
| 30 | #define MAX_CHUNK_SIZE 4040 |
| 31 | |
| 32 | static inline file_handle_t make_file_handle(storage_session_t s, uint32_t fid) |
| 33 | { |
| 34 | return ((uint64_t)s << 32) | fid; |
| 35 | } |
| 36 | |
| 37 | static inline storage_session_t _to_session(file_handle_t fh) |
| 38 | { |
| 39 | return (storage_session_t)(fh >> 32); |
| 40 | } |
| 41 | |
| 42 | static inline uint32_t _to_handle(file_handle_t fh) |
| 43 | { |
| 44 | return (uint32_t) fh; |
| 45 | } |
| 46 | |
| 47 | static inline uint32_t _to_msg_flags(uint32_t opflags) |
| 48 | { |
| 49 | uint32_t msg_flags = 0; |
| 50 | |
| 51 | if (opflags & STORAGE_OP_COMPLETE) |
| 52 | msg_flags |= STORAGE_MSG_FLAG_TRANSACT_COMPLETE; |
| 53 | |
| 54 | return msg_flags; |
| 55 | } |
| 56 | |
| 57 | static ssize_t check_response(struct storage_msg *msg, ssize_t res) |
| 58 | { |
| 59 | if (res < 0) |
| 60 | return res; |
| 61 | |
| 62 | if ((size_t)res < sizeof(*msg)) { |
| 63 | ALOGE("invalid msg length (%zd < %zd)\n", res, sizeof(*msg)); |
| 64 | return -EIO; |
| 65 | } |
| 66 | |
| 67 | ALOGV("cmd 0x%x: server returned %u\n", msg->cmd, msg->result); |
| 68 | |
| 69 | switch(msg->result) { |
| 70 | case STORAGE_NO_ERROR: |
| 71 | return res - sizeof(*msg); |
| 72 | |
| 73 | case STORAGE_ERR_NOT_FOUND: |
| 74 | return -ENOENT; |
| 75 | |
| 76 | case STORAGE_ERR_EXIST: |
| 77 | return -EEXIST; |
| 78 | |
| 79 | case STORAGE_ERR_NOT_VALID: |
| 80 | return -EINVAL; |
| 81 | |
| 82 | case STORAGE_ERR_UNIMPLEMENTED: |
| 83 | ALOGE("cmd 0x%x: is unhandles command\n", msg->cmd); |
| 84 | return -EINVAL; |
| 85 | |
| 86 | case STORAGE_ERR_ACCESS: |
| 87 | return -EACCES; |
| 88 | |
| 89 | case STORAGE_ERR_TRANSACT: |
| 90 | return -EBUSY; |
| 91 | |
| 92 | case STORAGE_ERR_GENERIC: |
| 93 | ALOGE("cmd 0x%x: internal server error\n", msg->cmd); |
| 94 | return -EIO; |
| 95 | |
| 96 | default: |
| 97 | ALOGE("cmd 0x%x: unhandled server response %u\n", |
| 98 | msg->cmd, msg->result); |
| 99 | } |
| 100 | |
| 101 | return -EIO; |
| 102 | } |
| 103 | |
| 104 | static ssize_t send_reqv(storage_session_t session, |
| 105 | const struct iovec *tx_iovs, uint tx_iovcnt, |
| 106 | const struct iovec *rx_iovs, uint rx_iovcnt) |
| 107 | { |
| 108 | ssize_t rc; |
| 109 | |
| 110 | rc = writev(session, tx_iovs, tx_iovcnt); |
| 111 | if (rc < 0) { |
| 112 | rc = -errno; |
| 113 | ALOGE("failed to send request: %s\n", strerror(errno)); |
| 114 | return rc; |
| 115 | } |
| 116 | |
| 117 | rc = readv(session, rx_iovs, rx_iovcnt); |
| 118 | if (rc < 0) { |
| 119 | rc = -errno; |
| 120 | ALOGE("failed to recv response: %s\n", strerror(errno)); |
| 121 | return rc; |
| 122 | } |
| 123 | |
| 124 | return rc; |
| 125 | } |
| 126 | |
| 127 | int storage_open_session(const char *device, storage_session_t *session_p, |
| 128 | const char *port) |
| 129 | { |
| 130 | int rc = tipc_connect(device, port); |
| 131 | if (rc < 0) |
| 132 | return rc; |
| 133 | *session_p = (storage_session_t) rc; |
| 134 | return 0; |
| 135 | } |
| 136 | |
| 137 | void storage_close_session(storage_session_t session) |
| 138 | { |
| 139 | tipc_close(session); |
| 140 | } |
| 141 | |
| 142 | |
| 143 | int storage_open_file(storage_session_t session, file_handle_t *handle_p, const char *name, |
| 144 | uint32_t flags, uint32_t opflags) |
| 145 | { |
| 146 | struct storage_msg msg = { .cmd = STORAGE_FILE_OPEN, .flags = _to_msg_flags(opflags)}; |
| 147 | struct storage_file_open_req req = { .flags = flags }; |
| 148 | struct iovec tx[3] = {{&msg, sizeof(msg)}, {&req, sizeof(req)}, {(void *)name, strlen(name)}}; |
| 149 | struct storage_file_open_resp rsp = { 0 }; |
| 150 | struct iovec rx[2] = {{&msg, sizeof(msg)}, {&rsp, sizeof(rsp)}}; |
| 151 | |
| 152 | ssize_t rc = send_reqv(session, tx, 3, rx, 2); |
| 153 | rc = check_response(&msg, rc); |
| 154 | if (rc < 0) |
| 155 | return rc; |
| 156 | |
| 157 | if ((size_t)rc != sizeof(rsp)) { |
| 158 | ALOGE("%s: invalid response length (%zd != %zd)\n", __func__, rc, sizeof(rsp)); |
| 159 | return -EIO; |
| 160 | } |
| 161 | |
| 162 | *handle_p = make_file_handle(session, rsp.handle); |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | void storage_close_file(file_handle_t fh) |
| 167 | { |
| 168 | struct storage_msg msg = { .cmd = STORAGE_FILE_CLOSE }; |
| 169 | struct storage_file_close_req req = { .handle = _to_handle(fh)}; |
| 170 | struct iovec tx[2] = {{&msg, sizeof(msg)}, {&req, sizeof(req)}}; |
| 171 | struct iovec rx[1] = {{&msg, sizeof(msg)}}; |
| 172 | |
| 173 | ssize_t rc = send_reqv(_to_session(fh), tx, 2, rx, 1); |
| 174 | rc = check_response(&msg, rc); |
| 175 | if (rc < 0) { |
| 176 | ALOGE("close file failed (%d)\n", (int)rc); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | int storage_delete_file(storage_session_t session, const char *name, uint32_t opflags) |
| 181 | { |
| 182 | struct storage_msg msg = { .cmd = STORAGE_FILE_DELETE, .flags = _to_msg_flags(opflags)}; |
| 183 | struct storage_file_delete_req req = { .flags = 0, }; |
| 184 | struct iovec tx[3] = {{&msg, sizeof(msg)}, {&req, sizeof(req)}, {(void *)name, strlen(name)}}; |
| 185 | struct iovec rx[1] = {{&msg, sizeof(msg)}}; |
| 186 | |
| 187 | ssize_t rc = send_reqv(session, tx, 3, rx, 1); |
| 188 | return check_response(&msg, rc); |
| 189 | } |
| 190 | |
| 191 | static int _read_chunk(file_handle_t fh, storage_off_t off, void *buf, size_t size) |
| 192 | { |
| 193 | struct storage_msg msg = { .cmd = STORAGE_FILE_READ }; |
| 194 | struct storage_file_read_req req = { .handle = _to_handle(fh), .size = size, .offset = off }; |
| 195 | struct iovec tx[2] = {{&msg, sizeof(msg)}, {&req, sizeof(req)}}; |
| 196 | struct iovec rx[2] = {{&msg, sizeof(msg)}, {buf, size}}; |
| 197 | |
| 198 | ssize_t rc = send_reqv(_to_session(fh), tx, 2, rx, 2); |
| 199 | return check_response(&msg, rc); |
| 200 | } |
| 201 | |
| 202 | ssize_t storage_read(file_handle_t fh, storage_off_t off, void *buf, size_t size) |
| 203 | { |
| 204 | int rc; |
| 205 | size_t bytes_read = 0; |
| 206 | size_t chunk = MAX_CHUNK_SIZE; |
| 207 | uint8_t *ptr = buf; |
| 208 | |
| 209 | while (size) { |
| 210 | if (chunk > size) |
| 211 | chunk = size; |
| 212 | rc = _read_chunk(fh, off, ptr, chunk); |
| 213 | if (rc < 0) |
| 214 | return rc; |
| 215 | if (rc == 0) |
| 216 | break; |
| 217 | off += rc; |
| 218 | ptr += rc; |
| 219 | bytes_read += rc; |
| 220 | size -= rc; |
| 221 | } |
| 222 | return bytes_read; |
| 223 | } |
| 224 | |
| 225 | static int _write_req(file_handle_t fh, storage_off_t off, |
| 226 | const void *buf, size_t size, uint32_t msg_flags) |
| 227 | { |
| 228 | struct storage_msg msg = { .cmd = STORAGE_FILE_WRITE, .flags = msg_flags, }; |
| 229 | struct storage_file_write_req req = { .handle = _to_handle(fh), .offset = off, }; |
| 230 | struct iovec tx[3] = {{&msg, sizeof(msg)}, {&req, sizeof(req)}, {(void *)buf, size}}; |
| 231 | struct iovec rx[1] = {{&msg, sizeof(msg)}}; |
| 232 | |
| 233 | ssize_t rc = send_reqv(_to_session(fh), tx, 3, rx, 1); |
| 234 | rc = check_response(&msg, rc); |
| 235 | return rc < 0 ? rc : size; |
| 236 | } |
| 237 | |
| 238 | ssize_t storage_write(file_handle_t fh, storage_off_t off, |
| 239 | const void *buf, size_t size, uint32_t opflags) |
| 240 | { |
| 241 | int rc; |
| 242 | size_t bytes_written = 0; |
| 243 | size_t chunk = MAX_CHUNK_SIZE; |
| 244 | const uint8_t *ptr = buf; |
| 245 | uint32_t msg_flags = _to_msg_flags(opflags & ~STORAGE_OP_COMPLETE); |
| 246 | |
| 247 | while (size) { |
| 248 | if (chunk >= size) { |
| 249 | /* last chunk in sequence */ |
| 250 | chunk = size; |
| 251 | msg_flags = _to_msg_flags(opflags); |
| 252 | } |
| 253 | rc = _write_req(fh, off, ptr, chunk, msg_flags); |
| 254 | if (rc < 0) |
| 255 | return rc; |
| 256 | if ((size_t)rc != chunk) { |
| 257 | ALOGE("got partial write (%d)\n", (int)rc); |
| 258 | return -EIO; |
| 259 | } |
| 260 | off += chunk; |
| 261 | ptr += chunk; |
| 262 | bytes_written += chunk; |
| 263 | size -= chunk; |
| 264 | } |
| 265 | return bytes_written; |
| 266 | } |
| 267 | |
| 268 | int storage_set_file_size(file_handle_t fh, storage_off_t file_size, uint32_t opflags) |
| 269 | { |
| 270 | struct storage_msg msg = { .cmd = STORAGE_FILE_SET_SIZE, .flags = _to_msg_flags(opflags)}; |
| 271 | struct storage_file_set_size_req req = { .handle = _to_handle(fh), .size = file_size, }; |
| 272 | struct iovec tx[2] = {{&msg, sizeof(msg)}, {&req, sizeof(req)}}; |
| 273 | struct iovec rx[1] = {{&msg, sizeof(msg)}}; |
| 274 | |
| 275 | ssize_t rc = send_reqv(_to_session(fh), tx, 2, rx, 1); |
| 276 | return check_response(&msg, rc); |
| 277 | } |
| 278 | |
| 279 | int storage_get_file_size(file_handle_t fh, storage_off_t *size_p) |
| 280 | { |
| 281 | struct storage_msg msg = { .cmd = STORAGE_FILE_GET_SIZE }; |
| 282 | struct storage_file_get_size_req req = { .handle = _to_handle(fh), }; |
| 283 | struct iovec tx[2] = {{&msg, sizeof(msg)}, {&req, sizeof(req)}}; |
| 284 | struct storage_file_get_size_resp rsp; |
| 285 | struct iovec rx[2] = {{&msg, sizeof(msg)}, {&rsp, sizeof(rsp)}}; |
| 286 | |
| 287 | ssize_t rc = send_reqv(_to_session(fh), tx, 2, rx, 2); |
| 288 | rc = check_response(&msg, rc); |
| 289 | if (rc < 0) |
| 290 | return rc; |
| 291 | |
| 292 | if ((size_t)rc != sizeof(rsp)) { |
| 293 | ALOGE("%s: invalid response length (%zd != %zd)\n", __func__, rc, sizeof(rsp)); |
| 294 | return -EIO; |
| 295 | } |
| 296 | |
| 297 | *size_p = rsp.size; |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | int storage_end_transaction(storage_session_t session, bool complete) |
| 302 | { |
| 303 | struct storage_msg msg = { |
| 304 | .cmd = STORAGE_END_TRANSACTION, |
| 305 | .flags = complete ? STORAGE_MSG_FLAG_TRANSACT_COMPLETE : 0, |
| 306 | }; |
| 307 | struct iovec iov = {&msg, sizeof(msg)}; |
| 308 | |
| 309 | ssize_t rc = send_reqv(session, &iov, 1, &iov, 1); |
| 310 | return check_response(&msg, rc); |
| 311 | } |