brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "ipc/ipc_channel_reader.h" |
| 6 | |
tfarina@chromium.org | b6d8120 | 2012-11-16 07:22:17 +0900 | [diff] [blame] | 7 | #include "ipc/ipc_listener.h" |
jbates@chromium.org | 7cc8033 | 2012-09-18 12:41:29 +0900 | [diff] [blame] | 8 | #include "ipc/ipc_logging.h" |
| 9 | #include "ipc/ipc_message_macros.h" |
| 10 | |
brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 11 | namespace IPC { |
| 12 | namespace internal { |
| 13 | |
brettw@chromium.org | f947ed0 | 2012-06-12 07:35:26 +0900 | [diff] [blame] | 14 | ChannelReader::ChannelReader(Listener* listener) : listener_(listener) { |
jhawkins@chromium.org | 4448a87 | 2012-03-13 05:45:03 +0900 | [diff] [blame] | 15 | memset(input_buf_, 0, sizeof(input_buf_)); |
brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 16 | } |
| 17 | |
| 18 | ChannelReader::~ChannelReader() { |
| 19 | } |
| 20 | |
| 21 | bool ChannelReader::ProcessIncomingMessages() { |
| 22 | while (true) { |
| 23 | int bytes_read = 0; |
| 24 | ReadState read_state = ReadData(input_buf_, Channel::kReadBufferSize, |
| 25 | &bytes_read); |
| 26 | if (read_state == READ_FAILED) |
| 27 | return false; |
| 28 | if (read_state == READ_PENDING) |
| 29 | return true; |
| 30 | |
| 31 | DCHECK(bytes_read > 0); |
| 32 | if (!DispatchInputData(input_buf_, bytes_read)) |
| 33 | return false; |
| 34 | } |
| 35 | } |
| 36 | |
| 37 | bool ChannelReader::AsyncReadComplete(int bytes_read) { |
| 38 | return DispatchInputData(input_buf_, bytes_read); |
| 39 | } |
| 40 | |
morrita@chromium.org | 15996aa | 2014-08-05 08:44:17 +0900 | [diff] [blame] | 41 | bool ChannelReader::IsInternalMessage(const Message& m) { |
hubbe@chromium.org | 683920d | 2013-10-15 09:07:00 +0900 | [diff] [blame] | 42 | return m.routing_id() == MSG_ROUTING_NONE && |
| 43 | m.type() >= Channel::CLOSE_FD_MESSAGE_TYPE && |
| 44 | m.type() <= Channel::HELLO_MESSAGE_TYPE; |
| 45 | } |
| 46 | |
morrita@chromium.org | 15996aa | 2014-08-05 08:44:17 +0900 | [diff] [blame] | 47 | bool ChannelReader::IsHelloMessage(const Message& m) { |
brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 48 | return m.routing_id() == MSG_ROUTING_NONE && |
hubbe@chromium.org | 683920d | 2013-10-15 09:07:00 +0900 | [diff] [blame] | 49 | m.type() == Channel::HELLO_MESSAGE_TYPE; |
brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | bool ChannelReader::DispatchInputData(const char* input_data, |
| 53 | int input_data_len) { |
| 54 | const char* p; |
| 55 | const char* end; |
| 56 | |
| 57 | // Possibly combine with the overflow buffer to make a larger buffer. |
| 58 | if (input_overflow_buf_.empty()) { |
| 59 | p = input_data; |
| 60 | end = input_data + input_data_len; |
| 61 | } else { |
rkc@chromium.org | 3b17d8f | 2012-11-29 07:26:12 +0900 | [diff] [blame] | 62 | if (input_overflow_buf_.size() + input_data_len > |
| 63 | Channel::kMaximumMessageSize) { |
brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 64 | input_overflow_buf_.clear(); |
| 65 | LOG(ERROR) << "IPC message is too big"; |
| 66 | return false; |
| 67 | } |
| 68 | input_overflow_buf_.append(input_data, input_data_len); |
| 69 | p = input_overflow_buf_.data(); |
| 70 | end = p + input_overflow_buf_.size(); |
| 71 | } |
| 72 | |
| 73 | // Dispatch all complete messages in the data buffer. |
| 74 | while (p < end) { |
| 75 | const char* message_tail = Message::FindNext(p, end); |
| 76 | if (message_tail) { |
| 77 | int len = static_cast<int>(message_tail - p); |
| 78 | Message m(p, len); |
| 79 | if (!WillDispatchInputMessage(&m)) |
| 80 | return false; |
| 81 | |
jbates@chromium.org | 7cc8033 | 2012-09-18 12:41:29 +0900 | [diff] [blame] | 82 | #ifdef IPC_MESSAGE_LOG_ENABLED |
| 83 | Logging* logger = Logging::GetInstance(); |
| 84 | std::string name; |
| 85 | logger->GetMessageText(m.type(), &name, &m, NULL); |
epenner@chromium.org | 24f2bea | 2014-05-03 06:29:24 +0900 | [diff] [blame] | 86 | TRACE_EVENT1("ipc,toplevel", "ChannelReader::DispatchInputData", |
fmeawad@chromium.org | 4529a9d | 2014-02-07 03:28:53 +0900 | [diff] [blame] | 87 | "name", name); |
jbates@chromium.org | 7cc8033 | 2012-09-18 12:41:29 +0900 | [diff] [blame] | 88 | #else |
epenner@chromium.org | 24f2bea | 2014-05-03 06:29:24 +0900 | [diff] [blame] | 89 | TRACE_EVENT2("ipc,toplevel", "ChannelReader::DispatchInputData", |
jbates@chromium.org | 7cc8033 | 2012-09-18 12:41:29 +0900 | [diff] [blame] | 90 | "class", IPC_MESSAGE_ID_CLASS(m.type()), |
| 91 | "line", IPC_MESSAGE_ID_LINE(m.type())); |
| 92 | #endif |
| 93 | m.TraceMessageEnd(); |
hubbe@chromium.org | 683920d | 2013-10-15 09:07:00 +0900 | [diff] [blame] | 94 | if (IsInternalMessage(m)) |
| 95 | HandleInternalMessage(m); |
brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 96 | else |
| 97 | listener_->OnMessageReceived(m); |
jam@chromium.org | 822f1fb | 2014-05-16 08:06:07 +0900 | [diff] [blame] | 98 | if (m.dispatch_error()) |
| 99 | listener_->OnBadMessageReceived(m); |
brettw@chromium.org | 0e9d0a1 | 2012-03-08 21:30:28 +0900 | [diff] [blame] | 100 | p = message_tail; |
| 101 | } else { |
| 102 | // Last message is partial. |
| 103 | break; |
| 104 | } |
| 105 | } |
| 106 | |
| 107 | // Save any partial data in the overflow buffer. |
| 108 | input_overflow_buf_.assign(p, end - p); |
| 109 | |
| 110 | if (input_overflow_buf_.empty() && !DidEmptyInputBuffers()) |
| 111 | return false; |
| 112 | return true; |
| 113 | } |
| 114 | |
| 115 | |
| 116 | } // namespace internal |
| 117 | } // namespace IPC |