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naiveproxy/net/http/http_stream_parser.cc
klzgrad 46caed9b9c Import chromium-70.0.3538.110
2018-12-09 21:59:24 -05:00

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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "net/http/http_stream_parser.h"
#include <algorithm>
#include <utility>
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/compiler_specific.h"
#include "base/logging.h"
#include "base/metrics/histogram_macros.h"
#include "base/strings/string_util.h"
#include "base/values.h"
#include "net/base/io_buffer.h"
#include "net/base/ip_endpoint.h"
#include "net/base/upload_data_stream.h"
#include "net/http/http_chunked_decoder.h"
#include "net/http/http_request_headers.h"
#include "net/http/http_request_info.h"
#include "net/http/http_response_headers.h"
#include "net/http/http_util.h"
#include "net/log/net_log_event_type.h"
#include "net/socket/client_socket_handle.h"
#include "net/socket/ssl_client_socket.h"
#include "net/ssl/token_binding.h"
#include "url/url_canon.h"
namespace net {
namespace {
const uint64_t kMaxMergedHeaderAndBodySize = 1400;
const size_t kRequestBodyBufferSize = 1 << 14; // 16KB
std::string GetResponseHeaderLines(const HttpResponseHeaders& headers) {
std::string raw_headers = headers.raw_headers();
const char* null_separated_headers = raw_headers.c_str();
const char* header_line = null_separated_headers;
std::string cr_separated_headers;
while (header_line[0] != 0) {
cr_separated_headers += header_line;
cr_separated_headers += "\n";
header_line += strlen(header_line) + 1;
}
return cr_separated_headers;
}
// Return true if |headers| contain multiple |field_name| fields with different
// values.
bool HeadersContainMultipleCopiesOfField(const HttpResponseHeaders& headers,
const std::string& field_name) {
size_t it = 0;
std::string field_value;
if (!headers.EnumerateHeader(&it, field_name, &field_value))
return false;
// There's at least one |field_name| header. Check if there are any more
// such headers, and if so, return true if they have different values.
std::string field_value2;
while (headers.EnumerateHeader(&it, field_name, &field_value2)) {
if (field_value != field_value2)
return true;
}
return false;
}
std::unique_ptr<base::Value> NetLogSendRequestBodyCallback(
uint64_t length,
bool is_chunked,
bool did_merge,
NetLogCaptureMode /* capture_mode */) {
std::unique_ptr<base::DictionaryValue> dict(new base::DictionaryValue());
dict->SetInteger("length", static_cast<int>(length));
dict->SetBoolean("is_chunked", is_chunked);
dict->SetBoolean("did_merge", did_merge);
return std::move(dict);
}
// Returns true if |error_code| is an error for which we give the server a
// chance to send a body containing error information, if the error was received
// while trying to upload a request body.
bool ShouldTryReadingOnUploadError(int error_code) {
return (error_code == ERR_CONNECTION_RESET);
}
} // namespace
// Similar to DrainableIOBuffer(), but this version comes with its own
// storage. The motivation is to avoid repeated allocations of
// DrainableIOBuffer.
//
// Example:
//
// scoped_refptr<SeekableIOBuffer> buf =
// base::MakeRefCounted<SeekableIOBuffer>(1024);
// // capacity() == 1024. size() == BytesRemaining() == BytesConsumed() == 0.
// // data() points to the beginning of the buffer.
//
// // Read() takes an IOBuffer.
// int bytes_read = some_reader->Read(buf, buf->capacity());
// buf->DidAppend(bytes_read);
// // size() == BytesRemaining() == bytes_read. data() is unaffected.
//
// while (buf->BytesRemaining() > 0) {
// // Write() takes an IOBuffer. If it takes const char*, we could
/// // simply use the regular IOBuffer like buf->data() + offset.
// int bytes_written = Write(buf, buf->BytesRemaining());
// buf->DidConsume(bytes_written);
// }
// // BytesRemaining() == 0. BytesConsumed() == size().
// // data() points to the end of the consumed bytes (exclusive).
//
// // If you want to reuse the buffer, be sure to clear the buffer.
// buf->Clear();
// // size() == BytesRemaining() == BytesConsumed() == 0.
// // data() points to the beginning of the buffer.
//
class HttpStreamParser::SeekableIOBuffer : public IOBuffer {
public:
explicit SeekableIOBuffer(int capacity)
: IOBuffer(capacity),
real_data_(data_),
capacity_(capacity),
size_(0),
used_(0) {
}
// DidConsume() changes the |data_| pointer so that |data_| always points
// to the first unconsumed byte.
void DidConsume(int bytes) {
SetOffset(used_ + bytes);
}
// Returns the number of unconsumed bytes.
int BytesRemaining() const {
return size_ - used_;
}
// Seeks to an arbitrary point in the buffer. The notion of bytes consumed
// and remaining are updated appropriately.
void SetOffset(int bytes) {
DCHECK_GE(bytes, 0);
DCHECK_LE(bytes, size_);
used_ = bytes;
data_ = real_data_ + used_;
}
// Called after data is added to the buffer. Adds |bytes| added to
// |size_|. data() is unaffected.
void DidAppend(int bytes) {
DCHECK_GE(bytes, 0);
DCHECK_GE(size_ + bytes, 0);
DCHECK_LE(size_ + bytes, capacity_);
size_ += bytes;
}
// Changes the logical size to 0, and the offset to 0.
void Clear() {
size_ = 0;
SetOffset(0);
}
// Returns the logical size of the buffer (i.e the number of bytes of data
// in the buffer).
int size() const { return size_; }
// Returns the capacity of the buffer. The capacity is the size used when
// the object is created.
int capacity() const { return capacity_; }
private:
~SeekableIOBuffer() override {
// data_ will be deleted in IOBuffer::~IOBuffer().
data_ = real_data_;
}
char* real_data_;
const int capacity_;
int size_;
int used_;
};
// 2 CRLFs + max of 8 hex chars.
const size_t HttpStreamParser::kChunkHeaderFooterSize = 12;
HttpStreamParser::HttpStreamParser(ClientSocketHandle* connection,
const HttpRequestInfo* request,
GrowableIOBuffer* read_buffer,
const NetLogWithSource& net_log)
: io_state_(STATE_NONE),
request_(request),
request_headers_(nullptr),
request_headers_length_(0),
http_09_on_non_default_ports_enabled_(false),
read_buf_(read_buffer),
read_buf_unused_offset_(0),
response_header_start_offset_(-1),
received_bytes_(0),
sent_bytes_(0),
response_(nullptr),
response_body_length_(-1),
response_is_keep_alive_(false),
response_body_read_(0),
user_read_buf_(nullptr),
user_read_buf_len_(0),
connection_(connection),
net_log_(net_log),
sent_last_chunk_(false),
upload_error_(OK),
weak_ptr_factory_(this) {
CHECK(connection_) << "ClientSocketHandle passed to HttpStreamParser must "
"not be NULL. See crbug.com/790776";
io_callback_ = base::BindRepeating(&HttpStreamParser::OnIOComplete,
weak_ptr_factory_.GetWeakPtr());
}
HttpStreamParser::~HttpStreamParser() = default;
int HttpStreamParser::SendRequest(
const std::string& request_line,
const HttpRequestHeaders& headers,
const NetworkTrafficAnnotationTag& traffic_annotation,
HttpResponseInfo* response,
CompletionOnceCallback callback) {
DCHECK_EQ(STATE_NONE, io_state_);
DCHECK(callback_.is_null());
DCHECK(!callback.is_null());
DCHECK(response);
net_log_.AddEvent(NetLogEventType::HTTP_TRANSACTION_SEND_REQUEST_HEADERS,
base::Bind(&HttpRequestHeaders::NetLogCallback,
base::Unretained(&headers), &request_line));
DVLOG(1) << __func__ << "() request_line = \"" << request_line << "\""
<< " headers = \"" << headers.ToString() << "\"";
traffic_annotation_ = MutableNetworkTrafficAnnotationTag(traffic_annotation);
response_ = response;
// Put the peer's IP address and port into the response.
IPEndPoint ip_endpoint;
int result = connection_->socket()->GetPeerAddress(&ip_endpoint);
if (result != OK)
return result;
response_->socket_address = HostPortPair::FromIPEndPoint(ip_endpoint);
std::string request = request_line + headers.ToString();
request_headers_length_ = request.size();
if (request_->upload_data_stream != NULL) {
request_body_send_buf_ =
base::MakeRefCounted<SeekableIOBuffer>(kRequestBodyBufferSize);
if (request_->upload_data_stream->is_chunked()) {
// Read buffer is adjusted to guarantee that |request_body_send_buf_| is
// large enough to hold the encoded chunk.
request_body_read_buf_ = base::MakeRefCounted<SeekableIOBuffer>(
kRequestBodyBufferSize - kChunkHeaderFooterSize);
} else {
// No need to encode request body, just send the raw data.
request_body_read_buf_ = request_body_send_buf_;
}
}
io_state_ = STATE_SEND_HEADERS;
// If we have a small request body, then we'll merge with the headers into a
// single write.
bool did_merge = false;
if (ShouldMergeRequestHeadersAndBody(request, request_->upload_data_stream)) {
int merged_size = static_cast<int>(
request_headers_length_ + request_->upload_data_stream->size());
scoped_refptr<IOBuffer> merged_request_headers_and_body =
base::MakeRefCounted<IOBuffer>(merged_size);
// We'll repurpose |request_headers_| to store the merged headers and
// body.
request_headers_ = base::MakeRefCounted<DrainableIOBuffer>(
merged_request_headers_and_body, merged_size);
memcpy(request_headers_->data(), request.data(), request_headers_length_);
request_headers_->DidConsume(request_headers_length_);
uint64_t todo = request_->upload_data_stream->size();
while (todo) {
int consumed = request_->upload_data_stream->Read(
request_headers_.get(), static_cast<int>(todo),
CompletionOnceCallback());
// Read() must succeed synchronously if not chunked and in memory.
DCHECK_GT(consumed, 0);
request_headers_->DidConsume(consumed);
todo -= consumed;
}
DCHECK(request_->upload_data_stream->IsEOF());
// Reset the offset, so the buffer can be read from the beginning.
request_headers_->SetOffset(0);
did_merge = true;
net_log_.AddEvent(NetLogEventType::HTTP_TRANSACTION_SEND_REQUEST_BODY,
base::Bind(&NetLogSendRequestBodyCallback,
request_->upload_data_stream->size(),
false, /* not chunked */
true /* merged */));
}
if (!did_merge) {
// If we didn't merge the body with the headers, then |request_headers_|
// contains just the HTTP headers.
scoped_refptr<StringIOBuffer> headers_io_buf =
base::MakeRefCounted<StringIOBuffer>(request);
request_headers_ = base::MakeRefCounted<DrainableIOBuffer>(
std::move(headers_io_buf), request.size());
}
result = DoLoop(OK);
if (result == ERR_IO_PENDING)
callback_ = std::move(callback);
return result > 0 ? OK : result;
}
int HttpStreamParser::ReadResponseHeaders(CompletionOnceCallback callback) {
DCHECK(io_state_ == STATE_NONE || io_state_ == STATE_DONE);
DCHECK(callback_.is_null());
DCHECK(!callback.is_null());
DCHECK_EQ(0, read_buf_unused_offset_);
DCHECK(SendRequestBuffersEmpty());
// This function can be called with io_state_ == STATE_DONE if the
// connection is closed after seeing just a 1xx response code.
if (io_state_ == STATE_DONE)
return ERR_CONNECTION_CLOSED;
int result = OK;
io_state_ = STATE_READ_HEADERS;
if (read_buf_->offset() > 0) {
// Simulate the state where the data was just read from the socket.
result = read_buf_->offset();
read_buf_->set_offset(0);
}
if (result > 0)
io_state_ = STATE_READ_HEADERS_COMPLETE;
result = DoLoop(result);
if (result == ERR_IO_PENDING)
callback_ = std::move(callback);
return result > 0 ? OK : result;
}
void HttpStreamParser::Close(bool not_reusable) {
if (not_reusable && connection_->socket())
connection_->socket()->Disconnect();
connection_->Reset();
}
int HttpStreamParser::ReadResponseBody(IOBuffer* buf,
int buf_len,
CompletionOnceCallback callback) {
DCHECK(io_state_ == STATE_NONE || io_state_ == STATE_DONE);
DCHECK(callback_.is_null());
DCHECK(!callback.is_null());
DCHECK_LE(buf_len, kMaxBufSize);
DCHECK(SendRequestBuffersEmpty());
// Added to investigate crbug.com/499663.
CHECK(buf);
if (io_state_ == STATE_DONE)
return OK;
user_read_buf_ = buf;
user_read_buf_len_ = buf_len;
io_state_ = STATE_READ_BODY;
// Invalidate HttpRequestInfo pointer. This is to allow the stream to be
// shared across multiple consumers.
// It is safe to reset it at this point since request_->upload_data_stream
// is also not needed anymore.
request_ = nullptr;
int result = DoLoop(OK);
if (result == ERR_IO_PENDING)
callback_ = std::move(callback);
return result;
}
void HttpStreamParser::OnIOComplete(int result) {
result = DoLoop(result);
// The client callback can do anything, including destroying this class,
// so any pending callback must be issued after everything else is done.
if (result != ERR_IO_PENDING && !callback_.is_null()) {
base::ResetAndReturn(&callback_).Run(result);
}
}
int HttpStreamParser::DoLoop(int result) {
do {
DCHECK_NE(ERR_IO_PENDING, result);
DCHECK_NE(STATE_DONE, io_state_);
DCHECK_NE(STATE_NONE, io_state_);
State state = io_state_;
io_state_ = STATE_NONE;
switch (state) {
case STATE_SEND_HEADERS:
DCHECK_EQ(OK, result);
result = DoSendHeaders();
DCHECK_NE(STATE_NONE, io_state_);
break;
case STATE_SEND_HEADERS_COMPLETE:
result = DoSendHeadersComplete(result);
DCHECK_NE(STATE_NONE, io_state_);
break;
case STATE_SEND_BODY:
DCHECK_EQ(OK, result);
result = DoSendBody();
DCHECK_NE(STATE_NONE, io_state_);
break;
case STATE_SEND_BODY_COMPLETE:
result = DoSendBodyComplete(result);
DCHECK_NE(STATE_NONE, io_state_);
break;
case STATE_SEND_REQUEST_READ_BODY_COMPLETE:
result = DoSendRequestReadBodyComplete(result);
DCHECK_NE(STATE_NONE, io_state_);
break;
case STATE_SEND_REQUEST_COMPLETE:
result = DoSendRequestComplete(result);
break;
case STATE_READ_HEADERS:
net_log_.BeginEvent(NetLogEventType::HTTP_STREAM_PARSER_READ_HEADERS);
DCHECK_GE(result, 0);
result = DoReadHeaders();
break;
case STATE_READ_HEADERS_COMPLETE:
result = DoReadHeadersComplete(result);
net_log_.EndEventWithNetErrorCode(
NetLogEventType::HTTP_STREAM_PARSER_READ_HEADERS, result);
break;
case STATE_READ_BODY:
DCHECK_GE(result, 0);
result = DoReadBody();
break;
case STATE_READ_BODY_COMPLETE:
result = DoReadBodyComplete(result);
break;
default:
NOTREACHED();
break;
}
} while (result != ERR_IO_PENDING &&
(io_state_ != STATE_DONE && io_state_ != STATE_NONE));
return result;
}
int HttpStreamParser::DoSendHeaders() {
int bytes_remaining = request_headers_->BytesRemaining();
DCHECK_GT(bytes_remaining, 0);
// Record our best estimate of the 'request time' as the time when we send
// out the first bytes of the request headers.
if (bytes_remaining == request_headers_->size())
response_->request_time = base::Time::Now();
io_state_ = STATE_SEND_HEADERS_COMPLETE;
return connection_->socket()->Write(
request_headers_.get(), bytes_remaining, io_callback_,
NetworkTrafficAnnotationTag(traffic_annotation_));
}
int HttpStreamParser::DoSendHeadersComplete(int result) {
if (result < 0) {
// In the unlikely case that the headers and body were merged, all the
// the headers were sent, but not all of the body way, and |result| is
// an error that this should try reading after, stash the error for now and
// act like the request was successfully sent.
io_state_ = STATE_SEND_REQUEST_COMPLETE;
if (request_headers_->BytesConsumed() >= request_headers_length_ &&
ShouldTryReadingOnUploadError(result)) {
upload_error_ = result;
return OK;
}
return result;
}
sent_bytes_ += result;
request_headers_->DidConsume(result);
if (request_headers_->BytesRemaining() > 0) {
io_state_ = STATE_SEND_HEADERS;
return OK;
}
if (request_->upload_data_stream != NULL &&
(request_->upload_data_stream->is_chunked() ||
// !IsEOF() indicates that the body wasn't merged.
(request_->upload_data_stream->size() > 0 &&
!request_->upload_data_stream->IsEOF()))) {
net_log_.AddEvent(NetLogEventType::HTTP_TRANSACTION_SEND_REQUEST_BODY,
base::Bind(&NetLogSendRequestBodyCallback,
request_->upload_data_stream->size(),
request_->upload_data_stream->is_chunked(),
false /* not merged */));
io_state_ = STATE_SEND_BODY;
return OK;
}
// Finished sending the request.
io_state_ = STATE_SEND_REQUEST_COMPLETE;
return OK;
}
int HttpStreamParser::DoSendBody() {
if (request_body_send_buf_->BytesRemaining() > 0) {
io_state_ = STATE_SEND_BODY_COMPLETE;
return connection_->socket()->Write(
request_body_send_buf_.get(), request_body_send_buf_->BytesRemaining(),
io_callback_, NetworkTrafficAnnotationTag(traffic_annotation_));
}
if (request_->upload_data_stream->is_chunked() && sent_last_chunk_) {
// Finished sending the request.
io_state_ = STATE_SEND_REQUEST_COMPLETE;
return OK;
}
request_body_read_buf_->Clear();
io_state_ = STATE_SEND_REQUEST_READ_BODY_COMPLETE;
return request_->upload_data_stream->Read(
request_body_read_buf_.get(), request_body_read_buf_->capacity(),
base::BindOnce(&HttpStreamParser::OnIOComplete,
weak_ptr_factory_.GetWeakPtr()));
}
int HttpStreamParser::DoSendBodyComplete(int result) {
if (result < 0) {
// If |result| is an error that this should try reading after, stash the
// error for now and act like the request was successfully sent.
io_state_ = STATE_SEND_REQUEST_COMPLETE;
if (ShouldTryReadingOnUploadError(result)) {
upload_error_ = result;
return OK;
}
return result;
}
sent_bytes_ += result;
request_body_send_buf_->DidConsume(result);
io_state_ = STATE_SEND_BODY;
return OK;
}
int HttpStreamParser::DoSendRequestReadBodyComplete(int result) {
// |result| is the result of read from the request body from the last call to
// DoSendBody().
if (result < 0) {
io_state_ = STATE_SEND_REQUEST_COMPLETE;
return result;
}
// Chunked data needs to be encoded.
if (request_->upload_data_stream->is_chunked()) {
if (result == 0) { // Reached the end.
DCHECK(request_->upload_data_stream->IsEOF());
sent_last_chunk_ = true;
}
// Encode the buffer as 1 chunk.
const base::StringPiece payload(request_body_read_buf_->data(), result);
request_body_send_buf_->Clear();
result = EncodeChunk(payload,
request_body_send_buf_->data(),
request_body_send_buf_->capacity());
}
if (result == 0) { // Reached the end.
// Reaching EOF means we can finish sending request body unless the data is
// chunked. (i.e. No need to send the terminal chunk.)
DCHECK(request_->upload_data_stream->IsEOF());
DCHECK(!request_->upload_data_stream->is_chunked());
// Finished sending the request.
io_state_ = STATE_SEND_REQUEST_COMPLETE;
} else if (result > 0) {
request_body_send_buf_->DidAppend(result);
result = 0;
io_state_ = STATE_SEND_BODY;
}
return result;
}
int HttpStreamParser::DoSendRequestComplete(int result) {
DCHECK_NE(result, ERR_IO_PENDING);
request_headers_ = nullptr;
request_body_send_buf_ = nullptr;
request_body_read_buf_ = nullptr;
return result;
}
int HttpStreamParser::DoReadHeaders() {
io_state_ = STATE_READ_HEADERS_COMPLETE;
// Grow the read buffer if necessary.
if (read_buf_->RemainingCapacity() == 0)
read_buf_->SetCapacity(read_buf_->capacity() + kHeaderBufInitialSize);
// http://crbug.com/16371: We're seeing |user_buf_->data()| return NULL.
// See if the user is passing in an IOBuffer with a NULL |data_|.
CHECK(read_buf_->data());
return connection_->socket()
->Read(read_buf_.get(), read_buf_->RemainingCapacity(), io_callback_);
}
int HttpStreamParser::DoReadHeadersComplete(int result) {
// DoReadHeadersComplete is called with the result of Socket::Read, which is a
// (byte_count | error), and returns (error | OK).
result = HandleReadHeaderResult(result);
// TODO(mmenke): The code below is ugly and hacky. A much better and more
// flexible long term solution would be to separate out the read and write
// loops, though this would involve significant changes, both here and
// elsewhere (WebSockets, for instance).
// If still reading the headers, or there was no error uploading the request
// body, just return the result.
if (io_state_ == STATE_READ_HEADERS || upload_error_ == OK)
return result;
// If the result is ERR_IO_PENDING, |io_state_| should be STATE_READ_HEADERS.
DCHECK_NE(ERR_IO_PENDING, result);
// On errors, use the original error received when sending the request.
// The main cases where these are different is when there's a header-related
// error code, or when there's an ERR_CONNECTION_CLOSED, which can result in
// special handling of partial responses and HTTP/0.9 responses.
if (result < 0) {
// Nothing else to do. In the HTTP/0.9 or only partial headers received
// cases, can normally go to other states after an error reading headers.
io_state_ = STATE_DONE;
// Don't let caller see the headers.
response_->headers = nullptr;
return upload_error_;
}
// Skip over 1xx responses as usual, and allow 4xx/5xx error responses to
// override the error received while uploading the body.
int response_code_class = response_->headers->response_code() / 100;
if (response_code_class == 1 || response_code_class == 4 ||
response_code_class == 5) {
return result;
}
// All other status codes are not allowed after an error during upload, to
// make sure the consumer has some indication there was an error.
// Nothing else to do.
io_state_ = STATE_DONE;
// Don't let caller see the headers.
response_->headers = nullptr;
return upload_error_;
}
int HttpStreamParser::DoReadBody() {
io_state_ = STATE_READ_BODY_COMPLETE;
// Added to investigate crbug.com/499663.
CHECK(user_read_buf_.get());
// There may be some data left over from reading the response headers.
if (read_buf_->offset()) {
int available = read_buf_->offset() - read_buf_unused_offset_;
if (available) {
CHECK_GT(available, 0);
int bytes_from_buffer = std::min(available, user_read_buf_len_);
memcpy(user_read_buf_->data(),
read_buf_->StartOfBuffer() + read_buf_unused_offset_,
bytes_from_buffer);
read_buf_unused_offset_ += bytes_from_buffer;
if (bytes_from_buffer == available) {
read_buf_->SetCapacity(0);
read_buf_unused_offset_ = 0;
}
return bytes_from_buffer;
} else {
read_buf_->SetCapacity(0);
read_buf_unused_offset_ = 0;
}
}
// Check to see if we're done reading.
if (IsResponseBodyComplete())
return 0;
DCHECK_EQ(0, read_buf_->offset());
return connection_->socket()
->Read(user_read_buf_.get(), user_read_buf_len_, io_callback_);
}
int HttpStreamParser::DoReadBodyComplete(int result) {
// When the connection is closed, there are numerous ways to interpret it.
//
// - If a Content-Length header is present and the body contains exactly that
// number of bytes at connection close, the response is successful.
//
// - If a Content-Length header is present and the body contains fewer bytes
// than promised by the header at connection close, it may indicate that
// the connection was closed prematurely, or it may indicate that the
// server sent an invalid Content-Length header. Unfortunately, the invalid
// Content-Length header case does occur in practice and other browsers are
// tolerant of it. We choose to treat it as an error for now, but the
// download system treats it as a non-error, and URLRequestHttpJob also
// treats it as OK if the Content-Length is the post-decoded body content
// length.
//
// - If chunked encoding is used and the terminating chunk has been processed
// when the connection is closed, the response is successful.
//
// - If chunked encoding is used and the terminating chunk has not been
// processed when the connection is closed, it may indicate that the
// connection was closed prematurely or it may indicate that the server
// sent an invalid chunked encoding. We choose to treat it as
// an invalid chunked encoding.
//
// - If a Content-Length is not present and chunked encoding is not used,
// connection close is the only way to signal that the response is
// complete. Unfortunately, this also means that there is no way to detect
// early close of a connection. No error is returned.
if (result == 0 && !IsResponseBodyComplete() && CanFindEndOfResponse()) {
if (chunked_decoder_.get())
result = ERR_INCOMPLETE_CHUNKED_ENCODING;
else
result = ERR_CONTENT_LENGTH_MISMATCH;
}
if (result > 0)
received_bytes_ += result;
// Filter incoming data if appropriate. FilterBuf may return an error.
if (result > 0 && chunked_decoder_.get()) {
result = chunked_decoder_->FilterBuf(user_read_buf_->data(), result);
if (result == 0 && !chunked_decoder_->reached_eof()) {
// Don't signal completion of the Read call yet or else it'll look like
// we received end-of-file. Wait for more data.
io_state_ = STATE_READ_BODY;
return OK;
}
}
if (result > 0)
response_body_read_ += result;
if (result <= 0 || IsResponseBodyComplete()) {
io_state_ = STATE_DONE;
// Save the overflow data, which can be in two places. There may be
// some left over in |user_read_buf_|, plus there may be more
// in |read_buf_|. But the part left over in |user_read_buf_| must have
// come from the |read_buf_|, so there's room to put it back at the
// start first.
int additional_save_amount = read_buf_->offset() - read_buf_unused_offset_;
int save_amount = 0;
if (chunked_decoder_.get()) {
save_amount = chunked_decoder_->bytes_after_eof();
} else if (response_body_length_ >= 0) {
int64_t extra_data_read = response_body_read_ - response_body_length_;
if (extra_data_read > 0) {
save_amount = static_cast<int>(extra_data_read);
if (result > 0)
result -= save_amount;
}
}
CHECK_LE(save_amount + additional_save_amount, kMaxBufSize);
if (read_buf_->capacity() < save_amount + additional_save_amount) {
read_buf_->SetCapacity(save_amount + additional_save_amount);
}
if (save_amount) {
received_bytes_ -= save_amount;
memcpy(read_buf_->StartOfBuffer(), user_read_buf_->data() + result,
save_amount);
}
read_buf_->set_offset(save_amount);
if (additional_save_amount) {
memmove(read_buf_->data(),
read_buf_->StartOfBuffer() + read_buf_unused_offset_,
additional_save_amount);
read_buf_->set_offset(save_amount + additional_save_amount);
}
read_buf_unused_offset_ = 0;
} else {
// Now waiting for more of the body to be read.
user_read_buf_ = NULL;
user_read_buf_len_ = 0;
}
return result;
}
int HttpStreamParser::HandleReadHeaderResult(int result) {
DCHECK_EQ(0, read_buf_unused_offset_);
if (result == 0)
result = ERR_CONNECTION_CLOSED;
if (result == ERR_CONNECTION_CLOSED) {
// The connection closed without getting any more data.
if (read_buf_->offset() == 0) {
io_state_ = STATE_DONE;
// If the connection has not been reused, it may have been a 0-length
// HTTP/0.9 responses, but it was most likely an error, so just return
// ERR_EMPTY_RESPONSE instead. If the connection was reused, just pass
// on the original connection close error, as rather than being an
// empty HTTP/0.9 response it's much more likely the server closed the
// socket before it received the request.
if (!connection_->is_reused())
return ERR_EMPTY_RESPONSE;
return result;
}
// Accepting truncated headers over HTTPS is a potential security
// vulnerability, so just return an error in that case.
//
// If response_header_start_offset_ is -1, this may be a < 8 byte HTTP/0.9
// response. However, accepting such a response over HTTPS would allow a
// MITM to truncate an HTTP/1.x status line to look like a short HTTP/0.9
// response if the peer put a record boundary at the first 8 bytes. To
// ensure that all response headers received over HTTPS are pristine, treat
// such responses as errors.
//
// TODO(mmenke): Returning ERR_RESPONSE_HEADERS_TRUNCATED when a response
// looks like an HTTP/0.9 response is weird. Should either come up with
// another error code, or, better, disable HTTP/0.9 over HTTPS (and give
// that a new error code).
if (request_->url.SchemeIsCryptographic()) {
io_state_ = STATE_DONE;
return ERR_RESPONSE_HEADERS_TRUNCATED;
}
// Parse things as well as we can and let the caller decide what to do.
int end_offset;
if (response_header_start_offset_ >= 0) {
// The response looks to be a truncated set of HTTP headers.
io_state_ = STATE_READ_BODY_COMPLETE;
end_offset = read_buf_->offset();
} else {
// The response is apparently using HTTP/0.9. Treat the entire response
// as the body.
end_offset = 0;
}
int rv = ParseResponseHeaders(end_offset);
if (rv < 0)
return rv;
return result;
}
if (result < 0) {
io_state_ = STATE_DONE;
return result;
}
// Record our best estimate of the 'response time' as the time when we read
// the first bytes of the response headers.
if (read_buf_->offset() == 0)
response_->response_time = base::Time::Now();
read_buf_->set_offset(read_buf_->offset() + result);
DCHECK_LE(read_buf_->offset(), read_buf_->capacity());
DCHECK_GT(result, 0);
int end_of_header_offset = FindAndParseResponseHeaders(result);
// Note: -1 is special, it indicates we haven't found the end of headers.
// Anything less than -1 is a net::Error, so we bail out.
if (end_of_header_offset < -1)
return end_of_header_offset;
if (end_of_header_offset == -1) {
io_state_ = STATE_READ_HEADERS;
// Prevent growing the headers buffer indefinitely.
if (read_buf_->offset() >= kMaxHeaderBufSize) {
io_state_ = STATE_DONE;
return ERR_RESPONSE_HEADERS_TOO_BIG;
}
} else {
CalculateResponseBodySize();
// If the body is zero length, the caller may not call ReadResponseBody,
// which is where any extra data is copied to read_buf_, so we move the
// data here.
if (response_body_length_ == 0) {
int extra_bytes = read_buf_->offset() - end_of_header_offset;
if (extra_bytes) {
CHECK_GT(extra_bytes, 0);
memmove(read_buf_->StartOfBuffer(),
read_buf_->StartOfBuffer() + end_of_header_offset,
extra_bytes);
}
read_buf_->SetCapacity(extra_bytes);
if (response_->headers->response_code() / 100 == 1) {
// After processing a 1xx response, the caller will ask for the next
// header, so reset state to support that. We don't completely ignore a
// 1xx response because it cannot be returned in reply to a CONNECT
// request so we return OK here, which lets the caller inspect the
// response and reject it in the event that we're setting up a CONNECT
// tunnel.
response_header_start_offset_ = -1;
response_body_length_ = -1;
// Now waiting for the second set of headers to be read.
} else {
// Only set keep-alive based on final set of headers.
response_is_keep_alive_ = response_->headers->IsKeepAlive();
io_state_ = STATE_DONE;
}
return OK;
}
// Only set keep-alive based on final set of headers.
response_is_keep_alive_ = response_->headers->IsKeepAlive();
// Note where the headers stop.
read_buf_unused_offset_ = end_of_header_offset;
// Now waiting for the body to be read.
}
return OK;
}
int HttpStreamParser::FindAndParseResponseHeaders(int new_bytes) {
DCHECK_GT(new_bytes, 0);
DCHECK_EQ(0, read_buf_unused_offset_);
int end_offset = -1;
// Look for the start of the status line, if it hasn't been found yet.
if (response_header_start_offset_ < 0) {
response_header_start_offset_ = HttpUtil::LocateStartOfStatusLine(
read_buf_->StartOfBuffer(), read_buf_->offset());
}
if (response_header_start_offset_ >= 0) {
// LocateEndOfHeaders looks for two line breaks in a row (With or without
// carriage returns). So the end of the headers includes at most the last 3
// bytes of the buffer from the past read. This optimization avoids O(n^2)
// performance in the case each read only returns a couple bytes. It's not
// too important in production, but for fuzzers with memory instrumentation,
// it's needed to avoid timing out.
int search_start = std::max(response_header_start_offset_,
read_buf_->offset() - new_bytes - 3);
end_offset = HttpUtil::LocateEndOfHeaders(
read_buf_->StartOfBuffer(), read_buf_->offset(), search_start);
} else if (read_buf_->offset() >= 8) {
// Enough data to decide that this is an HTTP/0.9 response.
// 8 bytes = (4 bytes of junk) + "http".length()
end_offset = 0;
}
if (end_offset == -1)
return -1;
int rv = ParseResponseHeaders(end_offset);
if (rv < 0)
return rv;
return end_offset;
}
int HttpStreamParser::ParseResponseHeaders(int end_offset) {
scoped_refptr<HttpResponseHeaders> headers;
DCHECK_EQ(0, read_buf_unused_offset_);
if (response_header_start_offset_ >= 0) {
received_bytes_ += end_offset;
headers = new HttpResponseHeaders(
HttpUtil::AssembleRawHeaders(read_buf_->StartOfBuffer(), end_offset));
} else {
// Enough data was read -- there is no status line, so this is HTTP/0.9, or
// the server is broken / doesn't speak HTTP.
// If the port is not the default for the scheme, assume it's not a real
// HTTP/0.9 response, and fail the request.
base::StringPiece scheme = request_->url.scheme_piece();
if (!http_09_on_non_default_ports_enabled_ &&
url::DefaultPortForScheme(scheme.data(), scheme.length()) !=
request_->url.EffectiveIntPort()) {
// Allow Shoutcast responses over HTTP, as it's somewhat common and relies
// on HTTP/0.9 on weird ports to work.
// See
// https://groups.google.com/a/chromium.org/forum/#!topic/blink-dev/qS63pYso4P0
if (read_buf_->offset() < 3 || scheme != "http" ||
!base::LowerCaseEqualsASCII(
base::StringPiece(read_buf_->StartOfBuffer(), 3), "icy")) {
return ERR_INVALID_HTTP_RESPONSE;
}
}
headers = new HttpResponseHeaders(std::string("HTTP/0.9 200 OK"));
}
// Check for multiple Content-Length headers when the response is not
// chunked-encoded. If they exist, and have distinct values, it's a potential
// response smuggling attack.
if (!headers->IsChunkEncoded()) {
if (HeadersContainMultipleCopiesOfField(*headers, "Content-Length"))
return ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_LENGTH;
}
// Check for multiple Content-Disposition or Location headers. If they exist,
// it's also a potential response smuggling attack.
if (HeadersContainMultipleCopiesOfField(*headers, "Content-Disposition"))
return ERR_RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION;
if (HeadersContainMultipleCopiesOfField(*headers, "Location"))
return ERR_RESPONSE_HEADERS_MULTIPLE_LOCATION;
response_->headers = headers;
if (headers->GetHttpVersion() == HttpVersion(0, 9)) {
response_->connection_info = HttpResponseInfo::CONNECTION_INFO_HTTP0_9;
} else if (headers->GetHttpVersion() == HttpVersion(1, 0)) {
response_->connection_info = HttpResponseInfo::CONNECTION_INFO_HTTP1_0;
} else if (headers->GetHttpVersion() == HttpVersion(1, 1)) {
response_->connection_info = HttpResponseInfo::CONNECTION_INFO_HTTP1_1;
}
response_->vary_data.Init(*request_, *response_->headers);
DVLOG(1) << __func__ << "() content_length = \""
<< response_->headers->GetContentLength() << "\n\""
<< " headers = \"" << GetResponseHeaderLines(*response_->headers)
<< "\"";
return OK;
}
void HttpStreamParser::CalculateResponseBodySize() {
// Figure how to determine EOF:
// For certain responses, we know the content length is always 0. From
// RFC 7230 Section 3.3 Message Body:
//
// The presence of a message body in a response depends on both the
// request method to which it is responding and the response status code
// (Section 3.1.2). Responses to the HEAD request method (Section 4.3.2
// of [RFC7231]) never include a message body because the associated
// response header fields (e.g., Transfer-Encoding, Content-Length,
// etc.), if present, indicate only what their values would have been if
// the request method had been GET (Section 4.3.1 of [RFC7231]). 2xx
// (Successful) responses to a CONNECT request method (Section 4.3.6 of
// [RFC7231]) switch to tunnel mode instead of having a message body.
// All 1xx (Informational), 204 (No Content), and 304 (Not Modified)
// responses do not include a message body. All other responses do
// include a message body, although the body might be of zero length.
//
// From RFC 7231 Section 6.3.6 205 Reset Content:
//
// Since the 205 status code implies that no additional content will be
// provided, a server MUST NOT generate a payload in a 205 response.
if (response_->headers->response_code() / 100 == 1) {
response_body_length_ = 0;
} else {
switch (response_->headers->response_code()) {
case 204: // No Content
case 205: // Reset Content
case 304: // Not Modified
response_body_length_ = 0;
break;
}
}
if (request_->method == "HEAD")
response_body_length_ = 0;
if (response_body_length_ == -1) {
// "Transfer-Encoding: chunked" trumps "Content-Length: N"
if (response_->headers->IsChunkEncoded()) {
chunked_decoder_.reset(new HttpChunkedDecoder());
} else {
response_body_length_ = response_->headers->GetContentLength();
// If response_body_length_ is still -1, then we have to wait
// for the server to close the connection.
}
}
}
bool HttpStreamParser::IsResponseBodyComplete() const {
if (chunked_decoder_.get())
return chunked_decoder_->reached_eof();
if (response_body_length_ != -1)
return response_body_read_ >= response_body_length_;
return false; // Must read to EOF.
}
bool HttpStreamParser::CanFindEndOfResponse() const {
return chunked_decoder_.get() || response_body_length_ >= 0;
}
bool HttpStreamParser::IsMoreDataBuffered() const {
return read_buf_->offset() > read_buf_unused_offset_;
}
bool HttpStreamParser::IsConnectionReused() const {
ClientSocketHandle::SocketReuseType reuse_type = connection_->reuse_type();
return connection_->is_reused() ||
reuse_type == ClientSocketHandle::UNUSED_IDLE;
}
void HttpStreamParser::SetConnectionReused() {
connection_->set_reuse_type(ClientSocketHandle::REUSED_IDLE);
}
bool HttpStreamParser::CanReuseConnection() const {
if (!CanFindEndOfResponse())
return false;
if (!response_is_keep_alive_)
return false;
// Check if extra data was received after reading the entire response body. If
// extra data was received, reusing the socket is not a great idea. This does
// have the down side of papering over certain server bugs, but seems to be
// the best option here.
//
// TODO(mmenke): Consider logging this - hard to decipher socket reuse
// behavior makes NetLogs harder to read.
if (IsResponseBodyComplete() && IsMoreDataBuffered())
return false;
return connection_->socket() && connection_->socket()->IsConnected();
}
void HttpStreamParser::GetSSLInfo(SSLInfo* ssl_info) {
if (request_->url.SchemeIsCryptographic() && connection_->socket()) {
connection_->socket()->GetSSLInfo(ssl_info);
}
}
void HttpStreamParser::GetSSLCertRequestInfo(
SSLCertRequestInfo* cert_request_info) {
if (request_->url.SchemeIsCryptographic() && connection_->socket()) {
connection_->socket()->GetSSLCertRequestInfo(cert_request_info);
}
}
Error HttpStreamParser::GetTokenBindingSignature(crypto::ECPrivateKey* key,
TokenBindingType tb_type,
std::vector<uint8_t>* out) {
if (!request_->url.SchemeIsCryptographic() || !connection_->socket()) {
NOTREACHED();
return ERR_FAILED;
}
return connection_->socket()->GetTokenBindingSignature(key, tb_type, out);
}
int HttpStreamParser::EncodeChunk(const base::StringPiece& payload,
char* output,
size_t output_size) {
if (output_size < payload.size() + kChunkHeaderFooterSize)
return ERR_INVALID_ARGUMENT;
char* cursor = output;
// Add the header.
const int num_chars = base::snprintf(output, output_size,
"%X\r\n",
static_cast<int>(payload.size()));
cursor += num_chars;
// Add the payload if any.
if (payload.size() > 0) {
memcpy(cursor, payload.data(), payload.size());
cursor += payload.size();
}
// Add the trailing CRLF.
memcpy(cursor, "\r\n", 2);
cursor += 2;
return cursor - output;
}
// static
bool HttpStreamParser::ShouldMergeRequestHeadersAndBody(
const std::string& request_headers,
const UploadDataStream* request_body) {
if (request_body != NULL &&
// IsInMemory() ensures that the request body is not chunked.
request_body->IsInMemory() &&
request_body->size() > 0) {
uint64_t merged_size = request_headers.size() + request_body->size();
if (merged_size <= kMaxMergedHeaderAndBodySize)
return true;
}
return false;
}
bool HttpStreamParser::SendRequestBuffersEmpty() {
return request_headers_ == nullptr && request_body_send_buf_ == nullptr &&
request_body_read_buf_ == nullptr;
}
} // namespace net
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