EntertainmentMode.cpp
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/**
\file EntertainmentMode.cpp
Copyright Notice\n
Copyright (C) 2020 Adam Honse - developer\n
Copyright (C) 2021 Moritz Wirger - developer\n
This file is part of hueplusplus.
hueplusplus is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
hueplusplus is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with hueplusplus. If not, see <http://www.gnu.org/licenses/>.
**/
#include "hueplusplus/EntertainmentMode.h"
#include "mbedtls/certs.h"
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/debug.h"
#include "mbedtls/entropy.h"
#include "mbedtls/error.h"
#include "mbedtls/net_sockets.h"
#include "mbedtls/ssl.h"
#include "mbedtls/timing.h"
namespace hueplusplus
{
constexpr uint8_t HUE_ENTERTAINMENT_HEADER_SIZE = 16;
constexpr uint8_t HUE_ENTERTAINMENT_LIGHT_SIZE = 9;
struct TLSContext
{
mbedtls_ssl_context ssl;
mbedtls_net_context server_fd;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
mbedtls_ssl_config conf;
mbedtls_x509_crt cacert;
mbedtls_timing_delay_context timer;
};
std::vector<char> hexToBytes(const std::string& hex)
{
std::vector<char> bytes;
for (unsigned int i = 0; i < hex.length(); i += 2)
{
std::string byteString = hex.substr(i, 2);
char byte = (char)strtol(byteString.c_str(), NULL, 16);
bytes.push_back(byte);
}
return bytes;
}
EntertainmentMode::EntertainmentMode(Bridge& b, Group& g)
: bridge(&b), group(&g), tls_context(std::make_unique<TLSContext>(TLSContext {}))
{
/*-------------------------------------------------*\
| Signal the bridge to start streaming |
\*-------------------------------------------------*/
bridge->startStreaming(std::to_string(group->getId()));
/*-------------------------------------------------*\
| Get the number of lights from the group |
\*-------------------------------------------------*/
entertainment_num_lights = group->getLightIds().size();
/*-------------------------------------------------*\
| Resize Entertainment Mode message buffer |
\*-------------------------------------------------*/
entertainment_msg.resize(HUE_ENTERTAINMENT_HEADER_SIZE + (entertainment_num_lights * HUE_ENTERTAINMENT_LIGHT_SIZE));
/*-------------------------------------------------*\
| Fill in Entertainment Mode message header |
\*-------------------------------------------------*/
memcpy(&entertainment_msg[0], "HueStream", 9);
entertainment_msg[9] = 0x01; // Version Major (1)
entertainment_msg[10] = 0x00; // Version Minor (0)
entertainment_msg[11] = 0x00; // Sequence ID
entertainment_msg[12] = 0x00; // Reserved
entertainment_msg[13] = 0x00; // Reserved
entertainment_msg[14] = 0x00; // Color Space (RGB)
entertainment_msg[15] = 0x00; // Reserved
/*-------------------------------------------------*\
| Fill in Entertainment Mode light data |
\*-------------------------------------------------*/
for (unsigned int light_idx = 0; light_idx < entertainment_num_lights; light_idx++)
{
unsigned int msg_idx = HUE_ENTERTAINMENT_HEADER_SIZE + (light_idx * HUE_ENTERTAINMENT_LIGHT_SIZE);
entertainment_msg[msg_idx + 0] = 0x00; // Type (Light)
entertainment_msg[msg_idx + 1] = group->getLightIds()[light_idx] >> 8; // ID MSB
entertainment_msg[msg_idx + 2] = group->getLightIds()[light_idx] & 0xFF; // ID LSB
entertainment_msg[msg_idx + 3] = 0x00; // Red MSB
entertainment_msg[msg_idx + 4] = 0x00; // Red LSB;
entertainment_msg[msg_idx + 5] = 0x00; // Green MSB;
entertainment_msg[msg_idx + 6] = 0x00; // Green LSB;
entertainment_msg[msg_idx + 7] = 0x00; // Blue MSB;
entertainment_msg[msg_idx + 8] = 0x00; // Blue LSB;
}
/*-------------------------------------------------*\
| Initialize mbedtls contexts |
\*-------------------------------------------------*/
mbedtls_net_init(&tls_context->server_fd);
mbedtls_ssl_init(&tls_context->ssl);
mbedtls_ssl_config_init(&tls_context->conf);
mbedtls_x509_crt_init(&tls_context->cacert);
mbedtls_ctr_drbg_init(&tls_context->ctr_drbg);
mbedtls_entropy_init(&tls_context->entropy);
/*-------------------------------------------------*\
| Seed the Deterministic Random Bit Generator (RNG) |
\*-------------------------------------------------*/
int ret = mbedtls_ctr_drbg_seed(&tls_context->ctr_drbg, mbedtls_entropy_func, &tls_context->entropy, NULL, 0);
/*-------------------------------------------------*\
| Parse certificate |
\*-------------------------------------------------*/
ret = mbedtls_x509_crt_parse(
&tls_context->cacert, (const unsigned char*)mbedtls_test_cas_pem, mbedtls_test_cas_pem_len);
}
EntertainmentMode::~EntertainmentMode()
{
mbedtls_entropy_free(&tls_context->entropy);
mbedtls_ctr_drbg_free(&tls_context->ctr_drbg);
mbedtls_x509_crt_free(&tls_context->cacert);
mbedtls_ssl_config_free(&tls_context->conf);
mbedtls_ssl_free(&tls_context->ssl);
mbedtls_net_free(&tls_context->server_fd);
}
bool EntertainmentMode::connect()
{
/*-------------------------------------------------*\
| Signal the bridge to start streaming |
| If successful, connect to the UDP port |
\*-------------------------------------------------*/
if (bridge->startStreaming(std::to_string(group->getId())))
{
/*-------------------------------------------------*\
| Connect to the Hue bridge UDP server |
\*-------------------------------------------------*/
int ret = mbedtls_net_connect(
&tls_context->server_fd, bridge->getBridgeIP().c_str(), "2100", MBEDTLS_NET_PROTO_UDP);
/*-------------------------------------------------*\
| If connecting failed, close and return false |
\*-------------------------------------------------*/
if (ret != 0)
{
mbedtls_ssl_close_notify(&tls_context->ssl);
bridge->stopStreaming(std::to_string(group->getId()));
return false;
}
/*-------------------------------------------------*\
| Configure defaults |
\*-------------------------------------------------*/
ret = mbedtls_ssl_config_defaults(
&tls_context->conf, MBEDTLS_SSL_IS_CLIENT, MBEDTLS_SSL_TRANSPORT_DATAGRAM, MBEDTLS_SSL_PRESET_DEFAULT);
/*-------------------------------------------------*\
| If configuring failed, close and return false |
\*-------------------------------------------------*/
if (ret != 0)
{
mbedtls_ssl_close_notify(&tls_context->ssl);
bridge->stopStreaming(std::to_string(group->getId()));
return false;
}
mbedtls_ssl_conf_authmode(&tls_context->conf, MBEDTLS_SSL_VERIFY_OPTIONAL);
mbedtls_ssl_conf_ca_chain(&tls_context->conf, &tls_context->cacert, NULL);
mbedtls_ssl_conf_rng(&tls_context->conf, mbedtls_ctr_drbg_random, &tls_context->ctr_drbg);
/*-------------------------------------------------*\
| Convert client key to binary array |
\*-------------------------------------------------*/
std::vector<char> psk_binary = hexToBytes(bridge->getClientKey());
/*-------------------------------------------------*\
| Configure SSL pre-shared key and identity |
| PSK - binary array from client key |
| Identity - username (ASCII) |
\*-------------------------------------------------*/
ret = mbedtls_ssl_conf_psk(&tls_context->conf, (const unsigned char*)&psk_binary[0], psk_binary.size(),
(const unsigned char*)bridge->getUsername().c_str(), bridge->getUsername().length());
/*-------------------------------------------------*\
| If configuring failed, close and return false |
\*-------------------------------------------------*/
if (ret != 0)
{
mbedtls_ssl_close_notify(&tls_context->ssl);
bridge->stopStreaming(std::to_string(group->getId()));
return false;
}
/*-------------------------------------------------*\
| Set up the SSL |
\*-------------------------------------------------*/
ret = mbedtls_ssl_setup(&tls_context->ssl, &tls_context->conf);
/*-------------------------------------------------*\
| If setup failed, close and return false |
\*-------------------------------------------------*/
if (ret != 0)
{
mbedtls_ssl_close_notify(&tls_context->ssl);
bridge->stopStreaming(std::to_string(group->getId()));
return false;
}
ret = mbedtls_ssl_set_hostname(&tls_context->ssl, "localhost");
/*-------------------------------------------------*\
| If set hostname failed, close and return false |
\*-------------------------------------------------*/
if (ret != 0)
{
mbedtls_ssl_close_notify(&tls_context->ssl);
bridge->stopStreaming(std::to_string(group->getId()));
return false;
}
mbedtls_ssl_set_bio(
&tls_context->ssl, &tls_context->server_fd, mbedtls_net_send, mbedtls_net_recv, mbedtls_net_recv_timeout);
mbedtls_ssl_set_timer_cb(
&tls_context->ssl, &tls_context->timer, mbedtls_timing_set_delay, mbedtls_timing_get_delay);
/*-------------------------------------------------*\
| Handshake |
\*-------------------------------------------------*/
do
{
ret = mbedtls_ssl_handshake(&tls_context->ssl);
} while (ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE);
/*-------------------------------------------------*\
| If set hostname failed, close and return false |
\*-------------------------------------------------*/
if (ret != 0)
{
mbedtls_ssl_close_notify(&tls_context->ssl);
bridge->stopStreaming(std::to_string(group->getId()));
return false;
}
return true;
}
else
{
return false;
}
}
bool EntertainmentMode::disconnect()
{
mbedtls_ssl_close_notify(&tls_context->ssl);
return bridge->stopStreaming(std::to_string(group->getId()));
}
bool EntertainmentMode::setColorRGB(uint8_t light_index, uint8_t red, uint8_t green, uint8_t blue)
{
if (light_index < entertainment_num_lights)
{
unsigned int msg_idx = HUE_ENTERTAINMENT_HEADER_SIZE + (light_index * HUE_ENTERTAINMENT_LIGHT_SIZE);
entertainment_msg[msg_idx + 3] = red; // Red MSB
entertainment_msg[msg_idx + 4] = red; // Red LSB;
entertainment_msg[msg_idx + 5] = green; // Green MSB;
entertainment_msg[msg_idx + 6] = green; // Green LSB;
entertainment_msg[msg_idx + 7] = blue; // Blue MSB;
entertainment_msg[msg_idx + 8] = blue; // Blue LSB;
return true;
}
else
{
return false;
}
}
bool EntertainmentMode::update()
{
int ret;
unsigned int total = 0;
while (total < entertainment_msg.size())
{
ret = mbedtls_ssl_write(
&tls_context->ssl, (const unsigned char*)&entertainment_msg[total], entertainment_msg.size());
if (ret < 0)
{
// Return if mbedtls_ssl_write errors
return false;
}
else
{
total += ret;
}
}
return true;
}
} // namespace hueplusplus