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AsyncWebSocket.cpp
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AsyncWebSocket.cpp
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/*
Asynchronous WebServer library for Espressif MCUs
Copyright (c) 2016 Hristo Gochkov. All rights reserved.
This file is part of the esp8266 core for Arduino environment.
This library 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 2.1 of the License, or (at your option) any later version.
This library 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 this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "Arduino.h"
#include "AsyncWebSocket.h"
#include <libb64/cencode.h>
#ifndef ESP8266
extern "C" {
typedef struct
{
uint32_t state[5];
uint32_t count[2];
unsigned char buffer[64];
} SHA1_CTX;
void SHA1Transform(uint32_t state[5], const unsigned char buffer[64]);
void SHA1Init(SHA1_CTX* context);
void SHA1Update(SHA1_CTX* context, const unsigned char* data, uint32_t len);
void SHA1Final(unsigned char digest[20], SHA1_CTX* context);
}
#else
#include <Hash.h>
#endif
#define MAX_PRINTF_LEN 64
size_t webSocketSendFrameWindow(AsyncClient *client)
{
if (!client->canSend())
return 0;
size_t space = client->space();
if (space < 9)
return 0;
return space - 8;
}
size_t webSocketSendFrame(AsyncClient *client, bool final, uint8_t opcode, bool mask, uint8_t *data, size_t len)
{
if (!client->canSend())
return 0;
size_t space = client->space();
if (space < 2)
return 0;
uint8_t mbuf[4] = {0, 0, 0, 0};
uint8_t headLen = 2;
if (len && mask)
{
headLen += 4;
mbuf[0] = rand() % 0xFF;
mbuf[1] = rand() % 0xFF;
mbuf[2] = rand() % 0xFF;
mbuf[3] = rand() % 0xFF;
}
if (len > 125)
headLen += 2;
if (space < headLen)
return 0;
space -= headLen;
if (len > space)
len = space;
uint8_t *buf = (uint8_t*)malloc(headLen);
if (buf == NULL)
{
//os_printf("could not malloc %u bytes for frame header\n", headLen);
return 0;
}
buf[0] = opcode & 0x0F;
if (final)
buf[0] |= 0x80;
if (len < 126)
buf[1] = len & 0x7F;
else
{
buf[1] = 126;
buf[2] = (uint8_t)((len >> 8) & 0xFF);
buf[3] = (uint8_t)(len & 0xFF);
}
if (len && mask)
{
buf[1] |= 0x80;
memcpy(buf + (headLen - 4), mbuf, 4);
}
if (client->add((const char *)buf, headLen) != headLen)
{
//os_printf("error adding %lu header bytes\n", headLen);
free(buf);
return 0;
}
free(buf);
if (len)
{
if (len && mask)
{
size_t i;
for (i = 0; i < len; i++)
data[i] = data[i] ^ mbuf[i % 4];
}
if (client->add((const char *)data, len) != len)
{
//os_printf("error adding %lu data bytes\n", len);
return 0;
}
}
if (!client->send())
{
//os_printf("error sending frame: %lu\n", headLen+len);
return 0;
}
return len;
}
/*
AsyncWebSocketMessageBuffer
*/
AsyncWebSocketMessageBuffer::AsyncWebSocketMessageBuffer()
: _data(nullptr)
, _len(0)
, _lock(false)
, _count(0)
{
}
AsyncWebSocketMessageBuffer::AsyncWebSocketMessageBuffer(uint8_t * data, size_t size)
: _data(nullptr)
, _len(size)
, _lock(false)
, _count(0)
{
if (!data)
{
return;
}
_data = new uint8_t[_len + 1];
if (_data)
{
memcpy(_data, data, _len);
_data[_len] = 0;
}
}
AsyncWebSocketMessageBuffer::AsyncWebSocketMessageBuffer(size_t size)
: _data(nullptr)
, _len(size)
, _lock(false)
, _count(0)
{
_data = new uint8_t[_len + 1];
if (_data)
{
_data[_len] = 0;
}
}
AsyncWebSocketMessageBuffer::AsyncWebSocketMessageBuffer(const AsyncWebSocketMessageBuffer & copy)
: _data(nullptr)
, _len(0)
, _lock(false)
, _count(0)
{
_len = copy._len;
_lock = copy._lock;
_count = 0;
if (_len)
{
_data = new uint8_t[_len + 1];
_data[_len] = 0;
}
if (_data)
{
memcpy(_data, copy._data, _len);
_data[_len] = 0;
}
}
AsyncWebSocketMessageBuffer::AsyncWebSocketMessageBuffer(AsyncWebSocketMessageBuffer && copy)
: _data(nullptr)
, _len(0)
, _lock(false)
, _count(0)
{
_len = copy._len;
_lock = copy._lock;
_count = 0;
if (copy._data)
{
_data = copy._data;
copy._data = nullptr;
}
}
AsyncWebSocketMessageBuffer::~AsyncWebSocketMessageBuffer()
{
if (_data)
{
delete[] _data;
}
}
bool AsyncWebSocketMessageBuffer::reserve(size_t size)
{
_len = size;
if (_data)
{
delete[] _data;
_data = nullptr;
}
_data = new uint8_t[_len + 1];
if (_data)
{
_data[_len] = 0;
return true;
}
else
{
return false;
}
}
/*
Control Frame
*/
class AsyncWebSocketControl
{
private:
uint8_t _opcode;
uint8_t *_data;
size_t _len;
bool _mask;
bool _finished;
public:
AsyncWebSocketControl(uint8_t opcode, uint8_t *data = NULL, size_t len = 0, bool mask = false)
: _opcode(opcode)
, _len(len)
, _mask(len && mask)
, _finished(false)
{
if (data == NULL)
_len = 0;
if (_len)
{
if (_len > 125)
_len = 125;
_data = (uint8_t*)malloc(_len);
if (_data == NULL)
_len = 0;
else
memcpy(_data, data, len);
}
else
_data = NULL;
}
virtual ~AsyncWebSocketControl()
{
if (_data != NULL)
free(_data);
}
virtual bool finished() const
{
return _finished;
}
uint8_t opcode()
{
return _opcode;
}
uint8_t len()
{
return _len + 2;
}
size_t send(AsyncClient *client)
{
_finished = true;
return webSocketSendFrame(client, true, _opcode & 0x0F, _mask, _data, _len);
}
};
/*
Basic Buffered Message
*/
AsyncWebSocketBasicMessage::AsyncWebSocketBasicMessage(const char * data, size_t len, uint8_t opcode, bool mask)
: _len(len)
, _sent(0)
, _ack(0)
, _acked(0)
{
_opcode = opcode & 0x07;
_mask = mask;
_data = (uint8_t*)malloc(_len + 1);
if (_data == NULL)
{
_len = 0;
_status = WS_MSG_ERROR;
}
else
{
_status = WS_MSG_SENDING;
memcpy(_data, data, _len);
_data[_len] = 0;
}
}
AsyncWebSocketBasicMessage::AsyncWebSocketBasicMessage(uint8_t opcode, bool mask)
: _len(0)
, _sent(0)
, _ack(0)
, _acked(0)
, _data(NULL)
{
_opcode = opcode & 0x07;
_mask = mask;
}
AsyncWebSocketBasicMessage::~AsyncWebSocketBasicMessage()
{
if (_data != NULL)
free(_data);
}
void AsyncWebSocketBasicMessage::ack(size_t len, uint32_t time)
{
(void)time;
_acked += len;
if (_sent == _len && _acked == _ack)
{
_status = WS_MSG_SENT;
}
}
size_t AsyncWebSocketBasicMessage::send(AsyncClient *client)
{
if (_status != WS_MSG_SENDING)
return 0;
if (_acked < _ack)
{
return 0;
}
if (_sent == _len)
{
if (_acked == _ack)
_status = WS_MSG_SENT;
return 0;
}
if (_sent > _len)
{
_status = WS_MSG_ERROR;
return 0;
}
size_t toSend = _len - _sent;
size_t window = webSocketSendFrameWindow(client);
if (window < toSend)
{
toSend = window;
}
_sent += toSend;
_ack += toSend + ((toSend < 126) ? 2 : 4) + (_mask * 4);
bool final = (_sent == _len);
uint8_t* dPtr = (uint8_t*)(_data + (_sent - toSend));
uint8_t opCode = (toSend && _sent == toSend) ? _opcode : (uint8_t)WS_CONTINUATION;
size_t sent = webSocketSendFrame(client, final, opCode, _mask, dPtr, toSend);
_status = WS_MSG_SENDING;
if (toSend && sent != toSend)
{
_sent -= (toSend - sent);
_ack -= (toSend - sent);
}
return sent;
}
// bool AsyncWebSocketBasicMessage::reserve(size_t size) {
// if (size) {
// _data = (uint8_t*)malloc(size +1);
// if (_data) {
// memset(_data, 0, size);
// _len = size;
// _status = WS_MSG_SENDING;
// return true;
// }
// }
// return false;
// }
/*
AsyncWebSocketMultiMessage Message
*/
AsyncWebSocketMultiMessage::AsyncWebSocketMultiMessage(AsyncWebSocketMessageBuffer * buffer, uint8_t opcode, bool mask)
: _len(0)
, _sent(0)
, _ack(0)
, _acked(0)
, _WSbuffer(nullptr)
{
_opcode = opcode & 0x07;
_mask = mask;
if (buffer)
{
_WSbuffer = buffer;
(*_WSbuffer)++;
_data = buffer->get();
_len = buffer->length();
_status = WS_MSG_SENDING;
//ets_printf("M: %u\n", _len);
}
else
{
_status = WS_MSG_ERROR;
}
}
AsyncWebSocketMultiMessage::~AsyncWebSocketMultiMessage()
{
if (_WSbuffer)
{
(*_WSbuffer)--; // decreases the counter.
}
}
void AsyncWebSocketMultiMessage::ack(size_t len, uint32_t time)
{
(void)time;
_acked += len;
if (_sent >= _len && _acked >= _ack)
{
_status = WS_MSG_SENT;
}
//ets_printf("A: %u\n", len);
}
size_t AsyncWebSocketMultiMessage::send(AsyncClient *client)
{
if (_status != WS_MSG_SENDING)
return 0;
if (_acked < _ack)
{
return 0;
}
if (_sent == _len)
{
_status = WS_MSG_SENT;
return 0;
}
if (_sent > _len)
{
_status = WS_MSG_ERROR;
//ets_printf("E: %u > %u\n", _sent, _len);
return 0;
}
size_t toSend = _len - _sent;
size_t window = webSocketSendFrameWindow(client);
if (window < toSend)
{
toSend = window;
}
_sent += toSend;
_ack += toSend + ((toSend < 126) ? 2 : 4) + (_mask * 4);
//ets_printf("W: %u %u\n", _sent - toSend, toSend);
bool final = (_sent == _len);
uint8_t* dPtr = (uint8_t*)(_data + (_sent - toSend));
uint8_t opCode = (toSend && _sent == toSend) ? _opcode : (uint8_t)WS_CONTINUATION;
size_t sent = webSocketSendFrame(client, final, opCode, _mask, dPtr, toSend);
_status = WS_MSG_SENDING;
if (toSend && sent != toSend)
{
//ets_printf("E: %u != %u\n", toSend, sent);
_sent -= (toSend - sent);
_ack -= (toSend - sent);
}
//ets_printf("S: %u %u\n", _sent, sent);
return sent;
}
/*
Async WebSocket Client
*/
const char * AWSC_PING_PAYLOAD = "ESPAsyncWebServer-PING";
const size_t AWSC_PING_PAYLOAD_LEN = 22;
AsyncWebSocketClient::AsyncWebSocketClient(AsyncWebServerRequest *request, AsyncWebSocket *server)
: _controlQueue(LinkedList<AsyncWebSocketControl *>([](AsyncWebSocketControl * c)
{
delete c;
}))
, _messageQueue(LinkedList<AsyncWebSocketMessage *>([](AsyncWebSocketMessage *m)
{
delete m;
}))
, _tempObject(NULL)
{
_client = request->client();
_server = server;
_clientId = _server->_getNextId();
_status = WS_CONNECTED;
_pstate = 0;
_lastMessageTime = millis();
_keepAlivePeriod = 0;
_client->setRxTimeout(0);
_client->onError([](void *r, AsyncClient * c, int8_t error)
{
(void)c;
((AsyncWebSocketClient*)(r))->_onError(error);
}, this);
_client->onAck([](void *r, AsyncClient * c, size_t len, uint32_t time)
{
(void)c;
((AsyncWebSocketClient*)(r))->_onAck(len, time);
}, this);
_client->onDisconnect([](void *r, AsyncClient * c)
{
((AsyncWebSocketClient*)(r))->_onDisconnect();
delete c;
}, this);
_client->onTimeout([](void *r, AsyncClient * c, uint32_t time)
{
(void)c;
((AsyncWebSocketClient*)(r))->_onTimeout(time);
}, this);
_client->onData([](void *r, AsyncClient * c, void *buf, size_t len)
{
(void)c;
((AsyncWebSocketClient*)(r))->_onData(buf, len);
}, this);
_client->onPoll([](void *r, AsyncClient * c)
{
(void)c;
((AsyncWebSocketClient*)(r))->_onPoll();
}, this);
_server->_addClient(this);
_server->_handleEvent(this, WS_EVT_CONNECT, request, NULL, 0);
delete request;
}
AsyncWebSocketClient::~AsyncWebSocketClient()
{
_messageQueue.free();
_controlQueue.free();
_server->_handleEvent(this, WS_EVT_DISCONNECT, NULL, NULL, 0);
}
void AsyncWebSocketClient::_onAck(size_t len, uint32_t time)
{
_lastMessageTime = millis();
if (!_controlQueue.isEmpty())
{
auto head = _controlQueue.front();
if (head->finished())
{
len -= head->len();
if (_status == WS_DISCONNECTING && head->opcode() == WS_DISCONNECT)
{
_controlQueue.remove(head);
_status = WS_DISCONNECTED;
_client->close(true);
return;
}
_controlQueue.remove(head);
}
}
if (len && !_messageQueue.isEmpty())
{
_messageQueue.front()->ack(len, time);
}
_server->_cleanBuffers();
_runQueue();
}
void AsyncWebSocketClient::_onPoll()
{
if (_client->canSend() && (!_controlQueue.isEmpty() || !_messageQueue.isEmpty()))
{
_runQueue();
}
else if (_keepAlivePeriod > 0 && _controlQueue.isEmpty() && _messageQueue.isEmpty()
&& (millis() - _lastMessageTime) >= _keepAlivePeriod)
{
ping((uint8_t *)AWSC_PING_PAYLOAD, AWSC_PING_PAYLOAD_LEN);
}
}
void AsyncWebSocketClient::_runQueue()
{
while (!_messageQueue.isEmpty() && _messageQueue.front()->finished())
{
_messageQueue.remove(_messageQueue.front());
}
if (!_controlQueue.isEmpty() && (_messageQueue.isEmpty() || _messageQueue.front()->betweenFrames())
&& webSocketSendFrameWindow(_client) > (size_t)(_controlQueue.front()->len() - 1))
{
_controlQueue.front()->send(_client);
}
else if (!_messageQueue.isEmpty() && _messageQueue.front()->betweenFrames() && webSocketSendFrameWindow(_client))
{
_messageQueue.front()->send(_client);
}
}
bool AsyncWebSocketClient::queueIsFull()
{
if ((_messageQueue.length() >= WS_MAX_QUEUED_MESSAGES) || (_status != WS_CONNECTED) )
return true;
return false;
}
void AsyncWebSocketClient::_queueMessage(AsyncWebSocketMessage *dataMessage)
{
if (dataMessage == NULL)
return;
if (_status != WS_CONNECTED)
{
delete dataMessage;
return;
}
if (_messageQueue.length() >= WS_MAX_QUEUED_MESSAGES)
{
ets_printf("ERROR: Too many messages queued\n");
delete dataMessage;
}
else
{
_messageQueue.add(dataMessage);
}
if (_client->canSend())
_runQueue();
}
void AsyncWebSocketClient::_queueControl(AsyncWebSocketControl *controlMessage)
{
if (controlMessage == NULL)
return;
_controlQueue.add(controlMessage);
if (_client->canSend())
_runQueue();
}
void AsyncWebSocketClient::close(uint16_t code, const char * message)
{
if (_status != WS_CONNECTED)
return;
if (code)
{
uint8_t packetLen = 2;
if (message != NULL)
{
size_t mlen = strlen(message);
if (mlen > 123)
mlen = 123;
packetLen += mlen;
}
char * buf = (char*)malloc(packetLen);
if (buf != NULL)
{
buf[0] = (uint8_t)(code >> 8);
buf[1] = (uint8_t)(code & 0xFF);
if (message != NULL)
{
memcpy(buf + 2, message, packetLen - 2);
}
_queueControl(new AsyncWebSocketControl(WS_DISCONNECT, (uint8_t*)buf, packetLen));
free(buf);
return;
}
}
_queueControl(new AsyncWebSocketControl(WS_DISCONNECT));
}
void AsyncWebSocketClient::ping(uint8_t *data, size_t len)
{
if (_status == WS_CONNECTED)
_queueControl(new AsyncWebSocketControl(WS_PING, data, len));
}
void AsyncWebSocketClient::_onError(int8_t) {}
void AsyncWebSocketClient::_onTimeout(uint32_t time)
{
(void)time;
_client->close(true);
}
void AsyncWebSocketClient::_onDisconnect()
{
_client = NULL;
_server->_handleDisconnect(this);
}
void AsyncWebSocketClient::_onData(void *pbuf, size_t plen)
{
_lastMessageTime = millis();
uint8_t *data = (uint8_t*)pbuf;
while (plen > 0)
{
if (!_pstate)
{
const uint8_t *fdata = data;
_pinfo.index = 0;
_pinfo.final = (fdata[0] & 0x80) != 0;
_pinfo.opcode = fdata[0] & 0x0F;
_pinfo.masked = (fdata[1] & 0x80) != 0;
_pinfo.len = fdata[1] & 0x7F;
data += 2;
plen -= 2;
if (_pinfo.len == 126)
{
_pinfo.len = fdata[3] | (uint16_t)(fdata[2]) << 8;
data += 2;
plen -= 2;
}
else if (_pinfo.len == 127)
{
_pinfo.len = fdata[9] | (uint16_t)(fdata[8]) << 8 | (uint32_t)(fdata[7]) << 16 | (uint32_t)(fdata[6]) << 24 |
(uint64_t)(fdata[5]) << 32 | (uint64_t)(fdata[4]) << 40 | (uint64_t)(fdata[3]) << 48 | (uint64_t)(fdata[2]) << 56;
data += 8;
plen -= 8;
}
if (_pinfo.masked)
{
memcpy(_pinfo.mask, data, 4);
data += 4;
plen -= 4;
}
}
const size_t datalen = std::min((size_t)(_pinfo.len - _pinfo.index), plen);
const auto datalast = data[datalen];
if (_pinfo.masked)
{
for (size_t i = 0; i < datalen; i++)
data[i] ^= _pinfo.mask[(_pinfo.index + i) % 4];
}
if ((datalen + _pinfo.index) < _pinfo.len)
{
_pstate = 1;
if (_pinfo.index == 0)
{
if (_pinfo.opcode)
{
_pinfo.message_opcode = _pinfo.opcode;
_pinfo.num = 0;
}
else
_pinfo.num += 1;
}
_server->_handleEvent(this, WS_EVT_DATA, (void *)&_pinfo, (uint8_t*)data, datalen);
_pinfo.index += datalen;
}
else if ((datalen + _pinfo.index) == _pinfo.len)
{
_pstate = 0;
if (_pinfo.opcode == WS_DISCONNECT)
{
if (datalen)
{
uint16_t reasonCode = (uint16_t)(data[0] << 8) + data[1];
char * reasonString = (char*)(data + 2);
if (reasonCode > 1001)
{
_server->_handleEvent(this, WS_EVT_ERROR, (void *)&reasonCode, (uint8_t*)reasonString, strlen(reasonString));
}
}
if (_status == WS_DISCONNECTING)
{
_status = WS_DISCONNECTED;
_client->close(true);
}
else
{
_status = WS_DISCONNECTING;
_client->ackLater();
_queueControl(new AsyncWebSocketControl(WS_DISCONNECT, data, datalen));
}
}
else if (_pinfo.opcode == WS_PING)
{
_queueControl(new AsyncWebSocketControl(WS_PONG, data, datalen));
}
else if (_pinfo.opcode == WS_PONG)
{
if (datalen != AWSC_PING_PAYLOAD_LEN || memcmp(AWSC_PING_PAYLOAD, data, AWSC_PING_PAYLOAD_LEN) != 0)
_server->_handleEvent(this, WS_EVT_PONG, NULL, data, datalen);
}
else if (_pinfo.opcode < 8) //continuation or text/binary frame
{
_server->_handleEvent(this, WS_EVT_DATA, (void *)&_pinfo, data, datalen);
}
}
else
{
//os_printf("frame error: len: %u, index: %llu, total: %llu\n", datalen, _pinfo.index, _pinfo.len);
//what should we do?
break;
}
// restore byte as _handleEvent may have added a null terminator i.e., data[len] = 0;
if (datalen > 0)
data[datalen] = datalast;
data += datalen;
plen -= datalen;
}
}
size_t AsyncWebSocketClient::printf(const char *format, ...)
{
va_list arg;
va_start(arg, format);
char* temp = new char[MAX_PRINTF_LEN];
if (!temp)
{
va_end(arg);
return 0;
}
char* buffer = temp;
size_t len = vsnprintf(temp, MAX_PRINTF_LEN, format, arg);
va_end(arg);
if (len > (MAX_PRINTF_LEN - 1))
{
buffer = new char[len + 1];
if (!buffer)
{
delete[] temp;
return 0;
}
va_start(arg, format);
vsnprintf(buffer, len + 1, format, arg);
va_end(arg);
}
text(buffer, len);
if (buffer != temp)
{
delete[] buffer;
}
delete[] temp;
return len;
}
#ifndef ESP32
size_t AsyncWebSocketClient::printf_P(PGM_P formatP, ...)
{
va_list arg;
va_start(arg, formatP);
char* temp = new char[MAX_PRINTF_LEN];
if (!temp)
{
va_end(arg);
return 0;
}
char* buffer = temp;
size_t len = vsnprintf_P(temp, MAX_PRINTF_LEN, formatP, arg);
va_end(arg);
if (len > (MAX_PRINTF_LEN - 1))
{
buffer = new char[len + 1];
if (!buffer)
{