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mhsw-espurna/code/espurna/telnet.cpp

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/*
TELNET MODULE
Copyright (C) 2017-2019 by Xose Pérez <xose dot perez at gmail dot com>
Parts of the code have been borrowed from Thomas Sarlandie's NetServer
(https://github.com/sarfata/kbox-firmware/tree/master/src/esp)
AsyncBufferedClient based on ESPAsyncTCPbuffer, distributed with the ESPAsyncTCP
(https://github.com/me-no-dev/ESPAsyncTCP/blob/master/src/ESPAsyncTCPbuffer.cpp)
Copyright (C) 2019-2020 by Maxim Prokhorov <prokhorov dot max at outlook dot com>
Updated to use WiFiServer and support reverse connections by Niek van der Maas < mail at niekvandermaas dot nl>
*/
#include "telnet.h"
#if TELNET_SUPPORT
#include <memory>
#include <vector>
#include "board.h"
#include "ws.h"
TTelnetServer _telnetServer(TELNET_PORT);
std::unique_ptr<TTelnetClient> _telnetClients[TELNET_MAX_CLIENTS];
bool _telnetAuth = TELNET_AUTHENTICATION;
bool _telnetClientsAuth[TELNET_MAX_CLIENTS];
// -----------------------------------------------------------------------------
// Private methods
// -----------------------------------------------------------------------------
#if WEB_SUPPORT
bool _telnetWebSocketOnKeyCheck(const char * key, JsonVariant& value) {
return (strncmp(key, "telnet", 6) == 0);
}
void _telnetWebSocketOnConnected(JsonObject& root) {
root["telnetSTA"] = getSetting("telnetSTA", 1 == TELNET_STA);
root["telnetAuth"] = getSetting("telnetAuth", 1 == TELNET_AUTHENTICATION);
}
#endif
#if TELNET_REVERSE_SUPPORT
void _telnetReverse(const char * host, uint16_t port) {
DEBUG_MSG_P(PSTR("[TELNET] Connecting to reverse telnet on %s:%d\n"), host, port);
unsigned char i;
for (i = 0; i < TELNET_MAX_CLIENTS; i++) {
if (!_telnetClients[i] || !_telnetClients[i]->connected()) {
#if TELNET_SERVER == TELNET_SERVER_WIFISERVER
_telnetClients[i] = std::make_unique<TTelnetClient>();
#else // TELNET_SERVER == TELNET_SERVER_ASYNC
_telnetSetupClient(i, new AsyncClient());
#endif
if (_telnetClients[i]->connect(host, port)) {
_telnetNotifyConnected(i);
return;
} else {
DEBUG_MSG_P(PSTR("[TELNET] Error connecting reverse telnet\n"));
_telnetDisconnect(i);
return;
}
}
}
//no free/disconnected spot so reject
if (i == TELNET_MAX_CLIENTS) {
DEBUG_MSG_P(PSTR("[TELNET] Failed too connect - too many clients connected\n"));
}
}
#if MQTT_SUPPORT
void _telnetReverseMQTTCallback(unsigned int type, const char * topic, const char * payload) {
if (type == MQTT_CONNECT_EVENT) {
mqttSubscribe(MQTT_TOPIC_TELNET_REVERSE);
} else if (type == MQTT_MESSAGE_EVENT) {
String t = mqttMagnitude((char *) topic);
if (t.equals(MQTT_TOPIC_TELNET_REVERSE)) {
String pl = String(payload);
int col = pl.indexOf(':');
if (col != -1) {
String host = pl.substring(0, col);
uint16_t port = pl.substring(col + 1).toInt();
_telnetReverse(host.c_str(), port);
} else {
DEBUG_MSG_P(PSTR("[TELNET] Incorrect reverse telnet value given, use the form \"host:ip\""));
}
}
}
}
#endif // MQTT_SUPPORT
#endif // TELNET_REVERSE_SUPPORT
#if TELNET_SERVER == TELNET_SERVER_WIFISERVER
static std::vector<char> _telnet_data_buffer;
void _telnetDisconnect(unsigned char clientId) {
_telnetClients[clientId]->stop();
_telnetClients[clientId] = nullptr;
wifiReconnectCheck();
DEBUG_MSG_P(PSTR("[TELNET] Client #%d disconnected\n"), clientId);
}
#elif TELNET_SERVER == TELNET_SERVER_ASYNC
void _telnetCleanUp() {
schedule_function([] () {
for (unsigned char clientId=0; clientId < TELNET_MAX_CLIENTS; ++clientId) {
if (!_telnetClients[clientId]->connected()) {
_telnetClients[clientId] = nullptr;
wifiReconnectCheck();
DEBUG_MSG_P(PSTR("[TELNET] Client #%d disconnected\n"), clientId);
}
}
});
}
// just close, clean-up method above will destroy the object later
void _telnetDisconnect(unsigned char clientId) {
_telnetClients[clientId]->close(true);
}
#if TELNET_SERVER_ASYNC_BUFFERED
AsyncBufferedClient::AsyncBufferedClient(AsyncClient* client) : _client(client) {
_client->onAck(_s_onAck, this);
_client->onPoll(_s_onPoll, this);
}
void AsyncBufferedClient::_trySend(AsyncBufferedClient* client) {
while (!client->_buffers.empty()) {
auto& chunk = client->_buffers.front();
if (client->_client->space() >= chunk.size()) {
client->_client->write((const char*)chunk.data(), chunk.size());
client->_buffers.pop_front();
continue;
}
return;
}
}
void AsyncBufferedClient::_s_onAck(void* client_ptr, AsyncClient*, size_t, uint32_t) {
_trySend(reinterpret_cast<AsyncBufferedClient*>(client_ptr));
}
void AsyncBufferedClient::_s_onPoll(void* client_ptr, AsyncClient* client) {
_trySend(reinterpret_cast<AsyncBufferedClient*>(client_ptr));
}
void AsyncBufferedClient::_addBuffer() {
// Note: c++17 emplace returns created object reference
_buffers.emplace_back();
_buffers.back().reserve(TCP_MSS);
}
size_t AsyncBufferedClient::write(const char* data, size_t size) {
if (_buffers.size() > AsyncBufferedClient::BUFFERS_MAX) return 0;
size_t written = 0;
if (_buffers.empty()) {
written = _client->add(data, size);
if (written == size) return size;
}
const size_t full_size = size;
char* data_ptr = const_cast<char*>(data + written);
size -= written;
while (size) {
if (_buffers.empty()) _addBuffer();
auto& current = _buffers.back();
const auto have = current.capacity() - current.size();
if (have >= size) {
current.insert(current.end(), data_ptr, data_ptr + size);
size = 0;
} else {
current.insert(current.end(), data_ptr, data_ptr + have);
_addBuffer();
data_ptr += have;
size -= have;
}
}
return full_size;
}
size_t AsyncBufferedClient::write(char c) {
char _c[1] {c};
return write(_c, 1);
}
void AsyncBufferedClient::flush() {
_client->send();
}
size_t AsyncBufferedClient::available() {
return _client->space();
}
bool AsyncBufferedClient::connect(const char *host, uint16_t port) {
return _client->connect(host, port);
}
void AsyncBufferedClient::close(bool now) {
_client->close(now);
}
bool AsyncBufferedClient::connected() {
return _client->connected();
}
#endif // TELNET_SERVER_ASYNC_BUFFERED
#endif // TELNET_SERVER == TELNET_SERVER_WIFISERVER
size_t _telnetWrite(unsigned char clientId, const char *data, size_t len) {
if (_telnetClients[clientId] && _telnetClients[clientId]->connected()) {
return _telnetClients[clientId]->write(data, len);
}
return 0;
}
size_t _telnetWrite(const char *data, size_t len) {
unsigned char count = 0;
for (unsigned char i = 0; i < TELNET_MAX_CLIENTS; i++) {
// Do not send broadcast messages to unauthenticated clients
if (_telnetAuth && !_telnetClientsAuth[i]) {
continue;
}
if (_telnetWrite(i, data, len)) ++count;
}
return count;
}
size_t _telnetWrite(const char *data) {
return _telnetWrite(data, strlen(data));
}
size_t _telnetWrite(unsigned char clientId, const char * message) {
return _telnetWrite(clientId, message, strlen(message));
}
void _telnetData(unsigned char clientId, char * data, size_t len) {
if ((len >= 2) && (data[0] == TELNET_IAC)) {
// C-d is sent as two bytes (sometimes repeating)
if (data[1] == TELNET_XEOF) {
_telnetDisconnect(clientId);
}
return; // Ignore telnet negotiation
}
if ((strncmp(data, "close", 5) == 0) || (strncmp(data, "quit", 4) == 0)) {
#if TELNET_SERVER == TELNET_SERVER_WIFISERVER
_telnetDisconnect(clientId);
#else
_telnetClients[clientId]->close();
#endif
return;
}
// Password prompt (disable on CORE variant)
const bool authenticated = isEspurnaCore() ? true : _telnetClientsAuth[clientId];
if (_telnetAuth && !authenticated) {
String password = getAdminPass();
if (strncmp(data, password.c_str(), password.length()) == 0) {
DEBUG_MSG_P(PSTR("[TELNET] Client #%d authenticated\n"), clientId);
_telnetWrite(clientId, "Password correct, welcome!\n");
_telnetClientsAuth[clientId] = true;
} else {
_telnetWrite(clientId, "Password (try again): ");
}
return;
}
// Inject command
#if TERMINAL_SUPPORT
terminalInject((void*)data, len);
#endif
}
void _telnetNotifyConnected(unsigned char i) {
DEBUG_MSG_P(PSTR("[TELNET] Client #%u connected\n"), i);
// If there is no terminal support automatically dump info and crash data
#if DEBUG_SUPPORT
#if not TERMINAL_SUPPORT
info();
wifiDebug();
crashDump();
crashClear();
#endif
#endif
if (!isEspurnaCore()) {
_telnetClientsAuth[i] = !_telnetAuth;
if (_telnetAuth) {
if (getAdminPass().length()) {
_telnetWrite(i, "Password: ");
} else {
_telnetClientsAuth[i] = true;
}
}
} else {
_telnetClientsAuth[i] = true;
}
wifiReconnectCheck();
}
#if TELNET_SERVER == TELNET_SERVER_WIFISERVER
void _telnetLoop() {
if (_telnetServer.hasClient()) {
int i;
for (i = 0; i < TELNET_MAX_CLIENTS; i++) {
if (!_telnetClients[i] || !_telnetClients[i]->connected()) {
_telnetClients[i] = std::make_unique<TTelnetClient>(_telnetServer.available());
if (_telnetClients[i]->localIP() != WiFi.softAPIP()) {
// Telnet is always available for the ESPurna Core image
const bool can_connect = isEspurnaCore() ? true : getSetting("telnetSTA", 1 == TELNET_STA);
if (!can_connect) {
DEBUG_MSG_P(PSTR("[TELNET] Rejecting - Only local connections\n"));
_telnetDisconnect(i);
return;
}
}
_telnetNotifyConnected(i);
break;
}
}
//no free/disconnected spot so reject
if (i == TELNET_MAX_CLIENTS) {
DEBUG_MSG_P(PSTR("[TELNET] Rejecting - Too many connections\n"));
_telnetServer.available().stop();
return;
}
}
for (int i = 0; i < TELNET_MAX_CLIENTS; i++) {
if (_telnetClients[i]) {
// Handle client timeouts
if (!_telnetClients[i]->connected()) {
_telnetDisconnect(i);
} else {
// Read data from clients
while (_telnetClients[i] && _telnetClients[i]->available()) {
size_t len = _telnetClients[i]->available();
unsigned int r = _telnetClients[i]->readBytes(_telnet_data_buffer.data(), min(_telnet_data_buffer.capacity(), len));
_telnetData(i, _telnet_data_buffer.data(), r);
}
}
}
}
}
#elif TELNET_SERVER == TELNET_SERVER_ASYNC
void _telnetSetupClient(unsigned char i, AsyncClient *client) {
client->onError([i](void *s, AsyncClient *client, int8_t error) {
DEBUG_MSG_P(PSTR("[TELNET] Error %s (%d) on client #%u\n"), client->errorToString(error), error, i);
});
client->onData([i](void*, AsyncClient*, void *data, size_t len){
_telnetData(i, reinterpret_cast<char*>(data), len);
});
client->onDisconnect([i](void*, AsyncClient*) {
_telnetCleanUp();
});
// XXX: AsyncClient does not have copy ctor
#if TELNET_SERVER_ASYNC_BUFFERED
_telnetClients[i] = std::make_unique<TTelnetClient>(client);
#else
_telnetClients[i] = std::unique_ptr<TTelnetClient>(client);
#endif // TELNET_SERVER_ASYNC_BUFFERED
}
void _telnetNewClient(AsyncClient* client) {
if (client->localIP() != WiFi.softAPIP()) {
// Telnet is always available for the ESPurna Core image
const bool can_connect = isEspurnaCore() ? true : getSetting("telnetSTA", 1 == TELNET_STA);
if (!can_connect) {
DEBUG_MSG_P(PSTR("[TELNET] Rejecting - Only local connections\n"));
client->onDisconnect([](void *s, AsyncClient *c) {
delete c;
});
client->close(true);
return;
}
}
for (unsigned char i = 0; i < TELNET_MAX_CLIENTS; i++) {
if (!_telnetClients[i] || !_telnetClients[i]->connected()) {
_telnetSetupClient(i, client);
_telnetNotifyConnected(i);
return;
}
}
DEBUG_MSG_P(PSTR("[TELNET] Rejecting - Too many connections\n"));
client->onDisconnect([](void *s, AsyncClient *c) {
delete c;
});
client->close(true);
}
#endif // TELNET_SERVER == TELNET_SERVER_WIFISERVER
// -----------------------------------------------------------------------------
// Public API
// -----------------------------------------------------------------------------
bool telnetConnected() {
for (auto& client : _telnetClients) {
if (client && client->connected()) return true;
}
return false;
}
#if DEBUG_TELNET_SUPPORT
bool telnetDebugSend(const char* prefix, const char* data) {
if (!telnetConnected()) return false;
bool result = false;
if (prefix && (prefix[0] != '\0')) {
result = _telnetWrite(prefix) > 0;
}
return (_telnetWrite(data) > 0) || result;
}
#endif // DEBUG_TELNET_SUPPORT
unsigned char telnetWrite(unsigned char ch) {
char data[1] = {ch};
return _telnetWrite(data, 1);
}
void _telnetConfigure() {
_telnetAuth = getSetting("telnetAuth", 1 == TELNET_AUTHENTICATION);
}
void telnetSetup() {
#if TELNET_SERVER == TELNET_SERVER_WIFISERVER
_telnet_data_buffer.reserve(terminalCapacity());
_telnetServer.setNoDelay(true);
_telnetServer.begin();
espurnaRegisterLoop(_telnetLoop);
#else
_telnetServer.onClient([](void *s, AsyncClient* c) {
_telnetNewClient(c);
}, nullptr);
_telnetServer.begin();
#endif
#if WEB_SUPPORT
wsRegister()
.onVisible([](JsonObject& root) { root["telnetVisible"] = 1; })
.onConnected(_telnetWebSocketOnConnected)
.onKeyCheck(_telnetWebSocketOnKeyCheck);
#endif
#if TELNET_REVERSE_SUPPORT
#if MQTT_SUPPORT
mqttRegister(_telnetReverseMQTTCallback);
#endif
#if TERMINAL_SUPPORT
terminalRegisterCommand(F("TELNET.REVERSE"), [](const terminal::CommandContext& ctx) {
if (ctx.argc < 3) {
terminalError(F("Wrong arguments. Usage: TELNET.REVERSE <host> <port>"));
return;
}
terminalOK();
_telnetReverse(ctx.argv[1].c_str(), ctx.argv[2].toInt());
});
#endif
#endif
espurnaRegisterReload(_telnetConfigure);
_telnetConfigure();
DEBUG_MSG_P(PSTR("[TELNET] Listening on port %d\n"), TELNET_PORT);
}
#endif // TELNET_SUPPORT