/* * Copyright (C) 2016 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include #include #include #include #include #include #include #include #include #include "ipc.h" #include "log.h" #define MAX_RECONNECT_RETRY_COUNT 5 #define TRUSTY_RECONNECT_TIMEOUT_SEC 5 static int tipc_fd = -1; int ipc_connect(const char *device, const char *port) { int rc; uint retry_cnt = 0; assert(tipc_fd == -1); while(true) { rc = tipc_connect(device, port); if (rc >= 0) break; ALOGE("failed (%d) to connect to storage server\n", rc); if (++retry_cnt > MAX_RECONNECT_RETRY_COUNT) { ALOGE("max number of reconnect retries (%d) has been reached\n", retry_cnt); return -1; } sleep(TRUSTY_RECONNECT_TIMEOUT_SEC); } tipc_fd = rc; return 0; } void ipc_disconnect(void) { assert(tipc_fd >= 0); tipc_close(tipc_fd); tipc_fd = -1; } ssize_t ipc_get_msg(struct storage_msg *msg, void *req_buf, size_t req_buf_len) { ssize_t rc; struct iovec iovs[2] = {{msg, sizeof(*msg)}, {req_buf, req_buf_len}}; assert(tipc_fd >= 0); rc = readv(tipc_fd, iovs, 2); if (rc < 0) { ALOGE("failed to read request: %s\n", strerror(errno)); return rc; } /* check for minimum size */ if ((size_t)rc < sizeof(*msg)) { ALOGE("message is too short (%zu bytes received)\n", rc); return -1; } /* check for message completeness */ if (msg->size != (uint32_t)rc) { ALOGE("inconsistent message size [cmd=%d] (%u != %u)\n", msg->cmd, msg->size, (uint32_t)rc); return -1; } return rc - sizeof(*msg); } int ipc_respond(struct storage_msg *msg, void *out, size_t out_size) { ssize_t rc; struct iovec iovs[2] = {{msg, sizeof(*msg)}, {out, out_size}}; assert(tipc_fd >= 0); msg->cmd |= STORAGE_RESP_BIT; rc = writev(tipc_fd, iovs, out ? 2 : 1); if (rc < 0) { ALOGE("error sending response 0x%x: %s\n", msg->cmd, strerror(errno)); return -1; } return 0; }