Cody Schuffelen | 134ff03 | 2019-11-22 00:25:32 -0800 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright (C) 2017 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 "host/commands/ivserver/hald_client.h" |
| 17 | |
| 18 | #include <string> |
| 19 | |
| 20 | #include <glog/logging.h> |
| 21 | |
| 22 | namespace ivserver { |
| 23 | namespace { |
| 24 | // The protocol between host-clients and the ivserver could change. |
| 25 | // Clients should verify what version they are talking to during the handshake. |
| 26 | const uint32_t kHaldClientProtocolVersion = 0; |
| 27 | } // anonymous namespace |
| 28 | |
| 29 | std::unique_ptr<HaldClient> HaldClient::New(const VSoCSharedMemory& shmem, |
| 30 | const cvd::SharedFD& clientfd) { |
| 31 | std::unique_ptr<HaldClient> res; |
| 32 | |
| 33 | if (!clientfd->IsOpen()) { |
| 34 | LOG(WARNING) << "Invalid socket passed to HaldClient: " |
| 35 | << clientfd->StrError(); |
| 36 | return res; |
| 37 | } |
| 38 | |
| 39 | res.reset(new HaldClient(clientfd)); |
| 40 | if (!res->PerformHandshake(shmem)) { |
| 41 | LOG(ERROR) << "HalD handshake failed. Dropping connection."; |
| 42 | res.reset(); |
| 43 | } |
| 44 | |
| 45 | return res; |
| 46 | } |
| 47 | |
| 48 | HaldClient::HaldClient(const cvd::SharedFD& client_socket) |
| 49 | : client_socket_(client_socket) {} |
| 50 | |
| 51 | bool HaldClient::PerformHandshake(const VSoCSharedMemory& shared_mem) { |
| 52 | int rval = |
| 53 | client_socket_->Send(&kHaldClientProtocolVersion, |
| 54 | sizeof(kHaldClientProtocolVersion), MSG_NOSIGNAL); |
| 55 | if (rval != sizeof(kHaldClientProtocolVersion)) { |
| 56 | LOG(ERROR) << "failed to send protocol version: " |
| 57 | << client_socket_->StrError(); |
| 58 | return false; |
| 59 | } |
| 60 | |
| 61 | int16_t region_name_len; |
| 62 | if (client_socket_->Recv(®ion_name_len, sizeof(region_name_len), |
| 63 | MSG_NOSIGNAL) != sizeof(region_name_len)) { |
| 64 | LOG(ERROR) << "Error receiving region name length: " |
| 65 | << client_socket_->StrError(); |
| 66 | return false; |
| 67 | } |
| 68 | |
| 69 | if (region_name_len <= 0 || |
| 70 | region_name_len > VSOC_DEVICE_NAME_SZ) { |
| 71 | LOG(ERROR) << "Invalid region length received: " << region_name_len; |
| 72 | return false; |
| 73 | } |
| 74 | |
| 75 | std::vector<char> region_name_data(region_name_len); |
| 76 | rval = client_socket_->Recv(region_name_data.data(), region_name_len, |
| 77 | MSG_NOSIGNAL); |
| 78 | if (rval != region_name_len) { |
| 79 | LOG(ERROR) << "Incomplete region name length received. Want: " |
| 80 | << region_name_len << ", got: " << rval; |
| 81 | return false; |
| 82 | } |
| 83 | |
| 84 | std::string region_name(region_name_data.begin(), region_name_data.end()); |
| 85 | LOG(INFO) << "New HALD requesting region: " << region_name; |
| 86 | |
| 87 | // Send Host, Guest and SharedMemory FDs associated with this region. |
| 88 | cvd::SharedFD guest_to_host_efd; |
| 89 | cvd::SharedFD host_to_guest_efd; |
| 90 | |
| 91 | if (!shared_mem.GetEventFdPairForRegion(region_name, &guest_to_host_efd, |
| 92 | &host_to_guest_efd)) { |
| 93 | LOG(ERROR) << "Region " << region_name << " was not found."; |
| 94 | return false; |
| 95 | } |
| 96 | |
| 97 | if (!guest_to_host_efd->IsOpen()) { |
| 98 | LOG(ERROR) << "Host channel is not open; last known error: " |
| 99 | << guest_to_host_efd->StrError(); |
| 100 | return false; |
| 101 | } |
| 102 | |
| 103 | if (!host_to_guest_efd->IsOpen()) { |
| 104 | LOG(ERROR) << "Guest channel is not open; last known error: " |
| 105 | << host_to_guest_efd->StrError(); |
| 106 | return false; |
| 107 | } |
| 108 | |
| 109 | // TODO(ender): delete this once no longer necessary. Currently, absence of |
| 110 | // payload makes RecvMsgAndFDs hang forever. |
| 111 | uint64_t control_data = 0; |
| 112 | struct iovec vec { |
| 113 | &control_data, sizeof(control_data) |
| 114 | }; |
| 115 | cvd::InbandMessageHeader hdr{nullptr, 0, &vec, 1, 0}; |
| 116 | cvd::SharedFD fds[3] = {guest_to_host_efd, host_to_guest_efd, |
| 117 | shared_mem.SharedMemFD()}; |
| 118 | rval = client_socket_->SendMsgAndFDs<3>(hdr, MSG_NOSIGNAL, fds); |
| 119 | if (rval == -1) { |
| 120 | LOG(ERROR) << "failed to send Host FD: " << client_socket_->StrError(); |
| 121 | return false; |
| 122 | } |
| 123 | |
| 124 | LOG(INFO) << "HALD managing region: " << region_name << " connected."; |
| 125 | return true; |
| 126 | } |
| 127 | |
| 128 | } // namespace ivserver |