| /* |
| * Copyright (C) 2017 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 "host/libs/ivserver/hald_client.h" |
| |
| #include <string> |
| |
| #include <glog/logging.h> |
| |
| namespace ivserver { |
| namespace { |
| // The protocol between host-clients and the ivserver could change. |
| // Clients should verify what version they are talking to during the handshake. |
| const uint32_t kHaldClientProtocolVersion = 0; |
| } // anonymous namespace |
| |
| std::unique_ptr<HaldClient> HaldClient::New(const VSoCSharedMemory& shmem, |
| const cvd::SharedFD& clientfd) { |
| std::unique_ptr<HaldClient> res; |
| |
| if (!clientfd->IsOpen()) { |
| LOG(WARNING) << "Invalid socket passed to HaldClient: " |
| << clientfd->StrError(); |
| return res; |
| } |
| |
| res.reset(new HaldClient(clientfd)); |
| if (!res->PerformHandshake(shmem)) { |
| LOG(ERROR) << "HalD handshake failed. Dropping connection."; |
| res.reset(); |
| } |
| |
| return res; |
| } |
| |
| HaldClient::HaldClient(const cvd::SharedFD& client_socket) |
| : client_socket_(client_socket) {} |
| |
| bool HaldClient::PerformHandshake(const VSoCSharedMemory& shared_mem) { |
| int rval = |
| client_socket_->Send(&kHaldClientProtocolVersion, |
| sizeof(kHaldClientProtocolVersion), MSG_NOSIGNAL); |
| if (rval != sizeof(kHaldClientProtocolVersion)) { |
| LOG(ERROR) << "failed to send protocol version: " |
| << client_socket_->StrError(); |
| return false; |
| } |
| |
| int16_t region_name_len; |
| if (client_socket_->Recv(®ion_name_len, sizeof(region_name_len), |
| MSG_NOSIGNAL) != sizeof(region_name_len)) { |
| LOG(ERROR) << "Error receiving region name length: " |
| << client_socket_->StrError(); |
| return false; |
| } |
| |
| if (region_name_len <= 0 || |
| region_name_len > VSoCSharedMemory::kMaxRegionNameLength) { |
| LOG(ERROR) << "Invalid region length received: " << region_name_len; |
| return false; |
| } |
| |
| std::vector<char> region_name_data(region_name_len); |
| rval = client_socket_->Recv(region_name_data.data(), region_name_len, |
| MSG_NOSIGNAL); |
| if (rval != region_name_len) { |
| LOG(ERROR) << "Incomplete region name length received. Want: " |
| << region_name_len << ", got: " << rval; |
| return false; |
| } |
| |
| std::string region_name(region_name_data.begin(), region_name_data.end()); |
| LOG(INFO) << "New HALD requesting region: " << region_name; |
| |
| // Send Host, Guest and SharedMemory FDs associated with this region. |
| cvd::SharedFD guest_to_host_efd; |
| cvd::SharedFD host_to_guest_efd; |
| |
| if (!shared_mem.GetEventFdPairForRegion(region_name, &guest_to_host_efd, |
| &host_to_guest_efd)) { |
| LOG(ERROR) << "Region " << region_name << " was not found."; |
| return false; |
| } |
| |
| if (!guest_to_host_efd->IsOpen()) { |
| LOG(ERROR) << "Host channel is not open; last known error: " |
| << guest_to_host_efd->StrError(); |
| return false; |
| } |
| |
| if (!host_to_guest_efd->IsOpen()) { |
| LOG(ERROR) << "Guest channel is not open; last known error: " |
| << host_to_guest_efd->StrError(); |
| return false; |
| } |
| |
| // TODO(ender): delete this once no longer necessary. Currently, absence of |
| // payload makes RecvMsgAndFDs hang forever. |
| uint64_t control_data = 0; |
| struct iovec vec { |
| &control_data, sizeof(control_data) |
| }; |
| cvd::InbandMessageHeader hdr{nullptr, 0, &vec, 1, 0}; |
| cvd::SharedFD fds[3] = {guest_to_host_efd, host_to_guest_efd, |
| shared_mem.SharedMemFD()}; |
| rval = client_socket_->SendMsgAndFDs<3>(hdr, MSG_NOSIGNAL, fds); |
| if (rval == -1) { |
| LOG(ERROR) << "failed to send Host FD: " << client_socket_->StrError(); |
| return false; |
| } |
| |
| LOG(INFO) << "HALD managing region: " << region_name << " connected."; |
| return true; |
| } |
| |
| } // namespace ivserver |