mirror of
https://github.com/boostorg/mqtt5.git
synced 2025-11-04 01:41:37 +01:00
33c8eea890
Summary: related to T13566 - mqtt_client has a new keep_alive(seconds) function - keep_alive(0) disables ping - if keep_alive() is not called, the client assumes keep_alive=10 - the client respects server_keep_alive if sent by the broker Reviewers: ivica Reviewed By: ivica Subscribers: miljen, iljazovic Differential Revision: https://repo.mireo.local/D27557
407 lines
11 KiB
C++
407 lines
11 KiB
C++
#ifndef ASYNC_MQTT5_CONNECT_OP_HPP
|
|
#define ASYNC_MQTT5_CONNECT_OP_HPP
|
|
|
|
#include <boost/asio/append.hpp>
|
|
#include <boost/asio/consign.hpp>
|
|
#include <boost/asio/dispatch.hpp>
|
|
#include <boost/asio/prepend.hpp>
|
|
#include <boost/asio/read.hpp>
|
|
#include <boost/asio/write.hpp>
|
|
#include <boost/asio/ip/tcp.hpp>
|
|
#include <boost/asio/any_completion_handler.hpp>
|
|
|
|
#include <boost/beast/http/field.hpp>
|
|
#include <boost/beast/websocket/rfc6455.hpp>
|
|
#include <boost/beast/websocket/stream_base.hpp>
|
|
|
|
#include <async_mqtt5/error.hpp>
|
|
|
|
#include <async_mqtt5/detail/async_traits.hpp>
|
|
#include <async_mqtt5/detail/control_packet.hpp>
|
|
#include <async_mqtt5/detail/internal_types.hpp>
|
|
|
|
#include <async_mqtt5/impl/codecs/message_decoders.hpp>
|
|
#include <async_mqtt5/impl/codecs/message_encoders.hpp>
|
|
|
|
namespace async_mqtt5::detail {
|
|
|
|
template <typename Stream>
|
|
class connect_op {
|
|
static constexpr size_t min_packet_sz = 5;
|
|
|
|
struct on_connect {};
|
|
struct on_tls_handshake {};
|
|
struct on_ws_handshake {};
|
|
struct on_send_connect {};
|
|
struct on_fixed_header {};
|
|
struct on_read_packet {};
|
|
struct on_init_auth_data {};
|
|
struct on_auth_data {};
|
|
struct on_send_auth {};
|
|
struct on_complete_auth {};
|
|
|
|
Stream& _stream;
|
|
mqtt_ctx& _ctx;
|
|
|
|
using handler_type = asio::any_completion_handler<void (error_code)>;
|
|
handler_type _handler;
|
|
|
|
std::unique_ptr<std::string> _buffer_ptr;
|
|
|
|
using endpoint = asio::ip::tcp::endpoint;
|
|
using epoints = asio::ip::tcp::resolver::results_type;
|
|
|
|
public:
|
|
template <typename Handler>
|
|
connect_op(
|
|
Stream& stream, Handler&& handler, mqtt_ctx& ctx
|
|
) :
|
|
_stream(stream), _ctx(ctx),
|
|
_handler(std::forward<Handler>(handler))
|
|
{}
|
|
|
|
connect_op(connect_op&&) noexcept = default;
|
|
connect_op(const connect_op&) = delete;
|
|
|
|
using executor_type = asio::associated_executor_t<handler_type>;
|
|
executor_type get_executor() const noexcept {
|
|
return asio::get_associated_executor(_handler);
|
|
}
|
|
|
|
using allocator_type = asio::associated_allocator_t<handler_type>;
|
|
allocator_type get_allocator() const noexcept {
|
|
return asio::get_associated_allocator(_handler);
|
|
}
|
|
|
|
using cancellation_slot_type =
|
|
asio::associated_cancellation_slot_t<handler_type>;
|
|
cancellation_slot_type get_cancellation_slot() const noexcept {
|
|
return asio::get_associated_cancellation_slot(_handler);
|
|
}
|
|
|
|
void perform(
|
|
const epoints& eps, authority_path ap
|
|
) {
|
|
lowest_layer(_stream).async_connect(
|
|
*std::begin(eps),
|
|
asio::append(
|
|
asio::prepend(std::move(*this), on_connect {}),
|
|
*std::begin(eps), std::move(ap)
|
|
)
|
|
);
|
|
}
|
|
|
|
void operator()(
|
|
on_connect, error_code ec, endpoint ep, authority_path ap
|
|
) {
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
do_tls_handshake(std::move(ep), std::move(ap));
|
|
}
|
|
|
|
void do_tls_handshake(endpoint ep, authority_path ap) {
|
|
if constexpr (has_tls_handshake<Stream>) {
|
|
_stream.async_handshake(
|
|
tls_handshake_type<Stream>::client,
|
|
asio::append(
|
|
asio::prepend(std::move(*this), on_tls_handshake {}),
|
|
std::move(ep), std::move(ap)
|
|
)
|
|
);
|
|
}
|
|
else if constexpr (
|
|
has_tls_handshake<typename next_layer_type<Stream>::type>
|
|
) {
|
|
_stream.next_layer().async_handshake(
|
|
tls_handshake_type<typename next_layer_type<Stream>::type>::client,
|
|
asio::append(
|
|
asio::prepend(std::move(*this), on_tls_handshake {}),
|
|
std::move(ep), std::move(ap)
|
|
)
|
|
);
|
|
}
|
|
else
|
|
do_ws_handshake(std::move(ep), std::move(ap));
|
|
}
|
|
|
|
void operator()(
|
|
on_tls_handshake, error_code ec,
|
|
endpoint ep, authority_path ap
|
|
) {
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
do_ws_handshake(std::move(ep), std::move(ap));
|
|
}
|
|
|
|
void do_ws_handshake(endpoint, authority_path ap) {
|
|
if constexpr (has_ws_handshake<Stream>) {
|
|
using namespace boost::beast;
|
|
|
|
// We'll need to turn off read timeouts on the underlying stream
|
|
// because the websocket stream has its own timeout system.
|
|
|
|
// Set suggested timeout settings for the websocket
|
|
_stream.set_option(
|
|
websocket::stream_base::timeout::suggested(role_type::client)
|
|
);
|
|
|
|
_stream.binary(true);
|
|
|
|
// Set a decorator to change the User-Agent of the handshake
|
|
_stream.set_option(websocket::stream_base::decorator(
|
|
[](websocket::request_type& req) {
|
|
req.set(http::field::sec_websocket_protocol, "mqtt");
|
|
req.set(http::field::user_agent, "boost.mqtt");
|
|
})
|
|
);
|
|
|
|
_stream.async_handshake(
|
|
ap.host + ':' + ap.port, ap.path,
|
|
asio::prepend(std::move(*this), on_ws_handshake {})
|
|
);
|
|
}
|
|
else
|
|
(*this)(on_ws_handshake {}, error_code {});
|
|
}
|
|
|
|
void operator()(on_ws_handshake, error_code ec) {
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
auto auth_method = _ctx.authenticator.method();
|
|
if (!auth_method.empty()) {
|
|
_ctx.co_props[prop::authentication_method] = auth_method;
|
|
return _ctx.authenticator.async_auth(
|
|
auth_step_e::client_initial, "",
|
|
asio::prepend(std::move(*this), on_init_auth_data {})
|
|
);
|
|
}
|
|
|
|
send_connect();
|
|
}
|
|
|
|
void operator()(on_init_auth_data, error_code ec, std::string data) {
|
|
if (ec)
|
|
return complete(asio::error::try_again);
|
|
|
|
_ctx.co_props[prop::authentication_data] = std::move(data);
|
|
send_connect();
|
|
}
|
|
|
|
void send_connect() {
|
|
auto packet = control_packet<allocator_type>::of(
|
|
no_pid, get_allocator(),
|
|
encoders::encode_connect,
|
|
_ctx.creds.client_id,
|
|
_ctx.creds.username, _ctx.creds.password,
|
|
_ctx.keep_alive, false, _ctx.co_props, _ctx.will_msg
|
|
);
|
|
|
|
auto wire_data = packet.wire_data();
|
|
|
|
detail::async_write(
|
|
_stream, asio::buffer(wire_data),
|
|
asio::consign(
|
|
asio::prepend(std::move(*this), on_send_connect {}),
|
|
std::move(packet)
|
|
)
|
|
);
|
|
}
|
|
|
|
void operator()(on_send_connect, error_code ec, size_t) {
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
_buffer_ptr = std::make_unique<std::string>(min_packet_sz, char(0));
|
|
|
|
auto buff = asio::buffer(_buffer_ptr->data(), min_packet_sz);
|
|
asio::async_read(
|
|
_stream, buff,
|
|
asio::prepend(std::move(*this), on_fixed_header {})
|
|
);
|
|
}
|
|
|
|
void operator()(
|
|
on_fixed_header, error_code ec, size_t num_read
|
|
) {
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
auto code = control_code_e((*_buffer_ptr)[0] & 0b11110000);
|
|
|
|
if (code != control_code_e::auth && code != control_code_e::connack)
|
|
return complete(asio::error::try_again);
|
|
|
|
auto varlen_ptr = _buffer_ptr->cbegin() + 1;
|
|
auto varlen = decoders::type_parse(
|
|
varlen_ptr, _buffer_ptr->cend(), decoders::basic::varint_
|
|
);
|
|
|
|
if (!varlen)
|
|
return complete(asio::error::try_again);
|
|
|
|
auto varlen_sz = std::distance(_buffer_ptr->cbegin() + 1, varlen_ptr);
|
|
auto remain_len = *varlen -
|
|
std::distance(varlen_ptr, _buffer_ptr->cbegin() + num_read);
|
|
|
|
if (num_read + remain_len > _buffer_ptr->size())
|
|
_buffer_ptr->resize(num_read + remain_len);
|
|
|
|
auto buff = asio::buffer(_buffer_ptr->data() + num_read, remain_len);
|
|
auto first = _buffer_ptr->cbegin() + varlen_sz + 1;
|
|
auto last = first + *varlen;
|
|
|
|
asio::async_read(
|
|
_stream, buff,
|
|
asio::prepend(
|
|
asio::append(std::move(*this), code, first, last),
|
|
on_read_packet {}
|
|
)
|
|
);
|
|
}
|
|
|
|
void operator()(
|
|
on_read_packet, error_code ec, size_t, control_code_e code,
|
|
byte_citer first, byte_citer last
|
|
) {
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
if (code == control_code_e::connack)
|
|
return on_connack(first, last);
|
|
|
|
if (!_ctx.co_props[prop::authentication_method].has_value())
|
|
return complete(client::error::malformed_packet);
|
|
|
|
on_auth(first, last);
|
|
}
|
|
|
|
void on_connack(byte_citer first, byte_citer last) {
|
|
auto packet_length = static_cast<uint32_t>(std::distance(first, last));
|
|
auto rv = decoders::decode_connack(packet_length, first);
|
|
if (!rv.has_value())
|
|
return complete(client::error::malformed_packet);
|
|
const auto& [session_present, reason_code, ca_props] = *rv;
|
|
|
|
_ctx.ca_props = ca_props;
|
|
_ctx.state.session_present(session_present);
|
|
|
|
// Unexpected result handling:
|
|
// - If we don't have a Session State, and we get session_present = true,
|
|
// we must close the network connection (and restart with a clean start)
|
|
// - If we have a Session State, and we get session_present = false,
|
|
// we must discard our Session State
|
|
|
|
auto rc = to_reason_code<reason_codes::category::connack>(reason_code);
|
|
if (!rc.has_value()) // reason code not allowed in CONNACK
|
|
return complete(client::error::malformed_packet);
|
|
|
|
auto ec = to_asio_error(*rc);
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
if (_ctx.co_props[prop::authentication_method].has_value())
|
|
return _ctx.authenticator.async_auth(
|
|
auth_step_e::server_final,
|
|
ca_props[prop::authentication_data].value_or(""),
|
|
asio::prepend(std::move(*this), on_complete_auth {})
|
|
);
|
|
|
|
complete(error_code {});
|
|
}
|
|
|
|
void on_auth(byte_citer first, byte_citer last) {
|
|
auto packet_length = static_cast<uint32_t>(std::distance(first, last));
|
|
auto rv = decoders::decode_auth(packet_length, first);
|
|
if (!rv.has_value())
|
|
return complete(client::error::malformed_packet);
|
|
const auto& [reason_code, auth_props] = *rv;
|
|
|
|
auto rc = to_reason_code<reason_codes::category::auth>(reason_code);
|
|
if (
|
|
!rc.has_value() ||
|
|
auth_props[prop::authentication_method]
|
|
!= _ctx.co_props[prop::authentication_method]
|
|
)
|
|
return complete(client::error::malformed_packet);
|
|
|
|
_ctx.authenticator.async_auth(
|
|
auth_step_e::server_challenge,
|
|
auth_props[prop::authentication_data].value_or(""),
|
|
asio::prepend(std::move(*this), on_auth_data {})
|
|
);
|
|
}
|
|
|
|
void operator()(on_auth_data, error_code ec, std::string data) {
|
|
if (ec)
|
|
return complete(asio::error::try_again);
|
|
|
|
auth_props props;
|
|
props[prop::authentication_method] =
|
|
_ctx.co_props[prop::authentication_method];
|
|
props[prop::authentication_data] = std::move(data);
|
|
|
|
auto packet = control_packet<allocator_type>::of(
|
|
no_pid, get_allocator(),
|
|
encoders::encode_auth,
|
|
reason_codes::continue_authentication.value(), props
|
|
);
|
|
|
|
auto wire_data = packet.wire_data();
|
|
|
|
detail::async_write(
|
|
_stream, asio::buffer(wire_data),
|
|
asio::consign(
|
|
asio::prepend(std::move(*this), on_send_auth{}),
|
|
std::move(packet)
|
|
)
|
|
);
|
|
}
|
|
|
|
void operator()(on_send_auth, error_code ec, size_t) {
|
|
if (ec)
|
|
return complete(ec);
|
|
|
|
auto buff = asio::buffer(_buffer_ptr->data(), min_packet_sz);
|
|
asio::async_read(
|
|
_stream, buff,
|
|
asio::prepend(std::move(*this), on_fixed_header {})
|
|
);
|
|
}
|
|
|
|
void operator()(on_complete_auth, error_code ec, std::string) {
|
|
if (ec)
|
|
return complete(asio::error::try_again);
|
|
|
|
complete(error_code {});
|
|
}
|
|
|
|
private:
|
|
void complete(error_code ec) {
|
|
get_cancellation_slot().clear();
|
|
|
|
std::move(_handler)(ec);
|
|
}
|
|
|
|
static error_code to_asio_error(reason_code rc) {
|
|
using namespace boost::asio::error;
|
|
using namespace reason_codes;
|
|
|
|
if (rc == success)
|
|
return {};
|
|
|
|
if (rc == unspecified_error || rc == server_unavailable ||
|
|
rc == server_busy || rc == connection_rate_exceeded)
|
|
return connection_refused;
|
|
|
|
return access_denied;
|
|
}
|
|
};
|
|
|
|
|
|
} // end namespace async_mqtt5::detail
|
|
|
|
#endif // !ASYNC_MQTT5_CONNECT_OP_HPP
|