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// Copyright 2022 The Chromium Authors.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <ios>
#include <iostream>
#include <sstream>
#include <utility>
#include "event_win.h"
#include "common/utils_win.h"
#include "agent_utils_win.h"
#include "scoped_print_handle_win.h"
namespace content_analysis {
namespace sdk {
// Writes a string to the pipe. Returns ERROR_SUCCESS if successful, else
// returns GetLastError() of the write. This function does not return until
// the entire message has been sent (or an error occurs).
static DWORD WriteMessageToPipe(HANDLE pipe, const std::string& message) {
if (message.empty()) {
return ERROR_SUCCESS;
}
internal::ScopedOverlapped overlapped;
if (!overlapped.is_valid()) {
return GetLastError();
}
DWORD err = ERROR_SUCCESS;
const char* cursor = message.data();
for (DWORD size = message.length(); size > 0;) {
if (WriteFile(pipe, cursor, size, /*written=*/nullptr, overlapped)) {
err = ERROR_SUCCESS;
break;
}
// If an I/O is not pending, return the error.
err = GetLastError();
if (err != ERROR_IO_PENDING) {
break;
}
DWORD written;
if (!GetOverlappedResult(pipe, overlapped, &written, /*wait=*/TRUE)) {
err = GetLastError();
break;
}
cursor += written;
size -= written;
}
return err;
}
ContentAnalysisEventWin::ContentAnalysisEventWin(
HANDLE handle,
const BrowserInfo& browser_info,
ContentAnalysisRequest req)
: ContentAnalysisEventBase(browser_info),
hPipe_(handle) {
*request() = std::move(req);
}
ContentAnalysisEventWin::~ContentAnalysisEventWin() {
Shutdown();
}
ResultCode ContentAnalysisEventWin::Init() {
// TODO(rogerta): do some extra validation of the request?
if (request()->request_token().empty()) {
return ResultCode::ERR_MISSING_REQUEST_TOKEN;
}
response()->set_request_token(request()->request_token());
// Prepare the response so that ALLOW verdicts are the default().
return UpdateResponse(*response(),
request()->tags_size() > 0 ? request()->tags(0) : std::string(),
ContentAnalysisResponse::Result::SUCCESS);
}
ResultCode ContentAnalysisEventWin::Close() {
Shutdown();
return ContentAnalysisEventBase::Close();
}
ResultCode ContentAnalysisEventWin::Send() {
if (response_sent_) {
return ResultCode::ERR_RESPONSE_ALREADY_SENT;
}
response_sent_ = true;
DWORD err = WriteMessageToPipe(hPipe_,
agent_to_chrome()->SerializeAsString());
return ErrorToResultCode(err);
}
std::string ContentAnalysisEventWin::DebugString() const {
std::stringstream state;
state.setf(std::ios::boolalpha);
state << "ContentAnalysisEventWin{handle=" << hPipe_;
state << " pid=" << GetBrowserInfo().pid;
state << " rtoken=" << GetRequest().request_token();
state << " sent=" << response_sent_;
state << "}" << std::ends;
return state.str();
}
void ContentAnalysisEventWin::Shutdown() {
if (hPipe_ != INVALID_HANDLE_VALUE) {
// If no response has been sent yet, attempt to send it now. Otherwise
// the client may be stuck waiting. After shutdown the agent will not
// have any other chance to respond.
if (!response_sent_) {
Send();
}
// This event does not own the pipe, so don't close it.
FlushFileBuffers(hPipe_);
hPipe_ = INVALID_HANDLE_VALUE;
}
}
} // namespace sdk
} // namespace content_analysis
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