godot/modules/websocket/wsl_peer.cpp

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/*************************************************************************/
/* wsl_peer.cpp */
/*************************************************************************/
/* This file is part of: */
/* GODOT ENGINE */
/* https://godotengine.org */
/*************************************************************************/
/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur. */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md). */
/* */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the */
/* "Software"), to deal in the Software without restriction, including */
/* without limitation the rights to use, copy, modify, merge, publish, */
/* distribute, sublicense, and/or sell copies of the Software, and to */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
/*************************************************************************/
#ifndef JAVASCRIPT_ENABLED
#include "wsl_peer.h"
#include "wsl_client.h"
#include "wsl_server.h"
#include "core/crypto/crypto_core.h"
#include "core/math/random_number_generator.h"
#include "core/os/os.h"
String WSLPeer::generate_key() {
// Random key
RandomNumberGenerator rng;
rng.set_seed(OS::get_singleton()->get_unix_time());
Vector<uint8_t> bkey;
int len = 16; // 16 bytes, as per RFC
bkey.resize(len);
uint8_t *w = bkey.ptrw();
for (int i = 0; i < len; i++) {
w[i] = (uint8_t)rng.randi_range(0, 255);
}
return CryptoCore::b64_encode_str(&w[0], len);
}
String WSLPeer::compute_key_response(String p_key) {
String key = p_key + "258EAFA5-E914-47DA-95CA-C5AB0DC85B11"; // Magic UUID as per RFC
Vector<uint8_t> sha = key.sha1_buffer();
return CryptoCore::b64_encode_str(sha.ptr(), sha.size());
}
void WSLPeer::_wsl_destroy(struct PeerData **p_data) {
if (!p_data || !(*p_data)) {
return;
}
struct PeerData *data = *p_data;
if (data->polling) {
data->destroy = true;
return;
}
wslay_event_context_free(data->ctx);
memdelete(data);
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*p_data = nullptr;
}
bool WSLPeer::_wsl_poll(struct PeerData *p_data) {
p_data->polling = true;
int err = 0;
if ((err = wslay_event_recv(p_data->ctx)) != 0 || (err = wslay_event_send(p_data->ctx)) != 0) {
print_verbose("Websocket (wslay) poll error: " + itos(err));
p_data->destroy = true;
}
p_data->polling = false;
if (p_data->destroy || (wslay_event_get_close_sent(p_data->ctx) && wslay_event_get_close_received(p_data->ctx))) {
bool valid = p_data->valid;
_wsl_destroy(&p_data);
return valid;
}
return false;
}
ssize_t wsl_recv_callback(wslay_event_context_ptr ctx, uint8_t *data, size_t len, int flags, void *user_data) {
struct WSLPeer::PeerData *peer_data = (struct WSLPeer::PeerData *)user_data;
if (!peer_data->valid) {
wslay_event_set_error(ctx, WSLAY_ERR_CALLBACK_FAILURE);
return -1;
}
Ref<StreamPeer> conn = peer_data->conn;
int read = 0;
Error err = conn->get_partial_data(data, len, read);
if (err != OK) {
print_verbose("Websocket get data error: " + itos(err) + ", read (should be 0!): " + itos(read));
wslay_event_set_error(ctx, WSLAY_ERR_CALLBACK_FAILURE);
return -1;
}
if (read == 0) {
wslay_event_set_error(ctx, WSLAY_ERR_WOULDBLOCK);
return -1;
}
return read;
}
ssize_t wsl_send_callback(wslay_event_context_ptr ctx, const uint8_t *data, size_t len, int flags, void *user_data) {
struct WSLPeer::PeerData *peer_data = (struct WSLPeer::PeerData *)user_data;
if (!peer_data->valid) {
wslay_event_set_error(ctx, WSLAY_ERR_CALLBACK_FAILURE);
return -1;
}
Ref<StreamPeer> conn = peer_data->conn;
int sent = 0;
Error err = conn->put_partial_data(data, len, sent);
if (err != OK) {
wslay_event_set_error(ctx, WSLAY_ERR_CALLBACK_FAILURE);
return -1;
}
if (sent == 0) {
wslay_event_set_error(ctx, WSLAY_ERR_WOULDBLOCK);
return -1;
}
return sent;
}
int wsl_genmask_callback(wslay_event_context_ptr ctx, uint8_t *buf, size_t len, void *user_data) {
RandomNumberGenerator rng;
// TODO maybe use crypto in the future?
rng.set_seed(OS::get_singleton()->get_unix_time());
for (unsigned int i = 0; i < len; i++) {
buf[i] = (uint8_t)rng.randi_range(0, 255);
}
return 0;
}
void wsl_msg_recv_callback(wslay_event_context_ptr ctx, const struct wslay_event_on_msg_recv_arg *arg, void *user_data) {
struct WSLPeer::PeerData *peer_data = (struct WSLPeer::PeerData *)user_data;
if (!peer_data->valid || peer_data->closing) {
return;
}
WSLPeer *peer = (WSLPeer *)peer_data->peer;
if (peer->parse_message(arg) != OK) {
return;
}
if (peer_data->is_server) {
WSLServer *helper = (WSLServer *)peer_data->obj;
helper->_on_peer_packet(peer_data->id);
} else {
WSLClient *helper = (WSLClient *)peer_data->obj;
helper->_on_peer_packet();
}
}
wslay_event_callbacks wsl_callbacks = {
wsl_recv_callback,
wsl_send_callback,
wsl_genmask_callback,
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nullptr, /* on_frame_recv_start_callback */
nullptr, /* on_frame_recv_callback */
nullptr, /* on_frame_recv_end_callback */
wsl_msg_recv_callback
};
Error WSLPeer::parse_message(const wslay_event_on_msg_recv_arg *arg) {
uint8_t is_string = 0;
if (arg->opcode == WSLAY_TEXT_FRAME) {
is_string = 1;
} else if (arg->opcode == WSLAY_CONNECTION_CLOSE) {
close_code = arg->status_code;
size_t len = arg->msg_length;
close_reason = "";
if (len > 2 /* first 2 bytes = close code */) {
close_reason.parse_utf8((char *)arg->msg + 2, len - 2);
}
if (!wslay_event_get_close_sent(_data->ctx)) {
if (_data->is_server) {
WSLServer *helper = (WSLServer *)_data->obj;
helper->_on_close_request(_data->id, close_code, close_reason);
} else {
WSLClient *helper = (WSLClient *)_data->obj;
helper->_on_close_request(close_code, close_reason);
}
}
return ERR_FILE_EOF;
} else if (arg->opcode != WSLAY_BINARY_FRAME) {
// Ping or pong
return ERR_SKIP;
}
_in_buffer.write_packet(arg->msg, arg->msg_length, &is_string);
return OK;
}
void WSLPeer::make_context(PeerData *p_data, unsigned int p_in_buf_size, unsigned int p_in_pkt_size, unsigned int p_out_buf_size, unsigned int p_out_pkt_size) {
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ERR_FAIL_COND(_data != nullptr);
ERR_FAIL_COND(p_data == nullptr);
_in_buffer.resize(p_in_pkt_size, p_in_buf_size);
_packet_buffer.resize((1 << MAX(p_in_buf_size, p_out_buf_size)));
_data = p_data;
_data->peer = this;
_data->valid = true;
if (_data->is_server) {
wslay_event_context_server_init(&(_data->ctx), &wsl_callbacks, _data);
} else {
wslay_event_context_client_init(&(_data->ctx), &wsl_callbacks, _data);
}
wslay_event_config_set_max_recv_msg_length(_data->ctx, (1ULL << p_in_buf_size));
}
void WSLPeer::set_write_mode(WriteMode p_mode) {
write_mode = p_mode;
}
WSLPeer::WriteMode WSLPeer::get_write_mode() const {
return write_mode;
}
void WSLPeer::poll() {
if (!_data) {
return;
}
if (_wsl_poll(_data)) {
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_data = nullptr;
}
}
Error WSLPeer::put_packet(const uint8_t *p_buffer, int p_buffer_size) {
ERR_FAIL_COND_V(!is_connected_to_host(), FAILED);
struct wslay_event_msg msg; // Should I use fragmented?
msg.opcode = write_mode == WRITE_MODE_TEXT ? WSLAY_TEXT_FRAME : WSLAY_BINARY_FRAME;
msg.msg = p_buffer;
msg.msg_length = p_buffer_size;
wslay_event_queue_msg(_data->ctx, &msg);
if (wslay_event_send(_data->ctx) < 0) {
close_now();
return FAILED;
}
return OK;
}
Error WSLPeer::get_packet(const uint8_t **r_buffer, int &r_buffer_size) {
r_buffer_size = 0;
ERR_FAIL_COND_V(!is_connected_to_host(), FAILED);
if (_in_buffer.packets_left() == 0) {
return ERR_UNAVAILABLE;
}
int read = 0;
uint8_t *rw = _packet_buffer.ptrw();
_in_buffer.read_packet(rw, _packet_buffer.size(), &_is_string, read);
*r_buffer = rw;
r_buffer_size = read;
return OK;
}
int WSLPeer::get_available_packet_count() const {
if (!is_connected_to_host()) {
return 0;
}
return _in_buffer.packets_left();
}
bool WSLPeer::was_string_packet() const {
return _is_string;
}
bool WSLPeer::is_connected_to_host() const {
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return _data != nullptr;
}
void WSLPeer::close_now() {
close(1000, "");
_wsl_destroy(&_data);
}
void WSLPeer::close(int p_code, String p_reason) {
if (_data && !wslay_event_get_close_sent(_data->ctx)) {
CharString cs = p_reason.utf8();
wslay_event_queue_close(_data->ctx, p_code, (uint8_t *)cs.ptr(), cs.size());
wslay_event_send(_data->ctx);
_data->closing = true;
}
_in_buffer.clear();
_packet_buffer.resize(0);
}
IP_Address WSLPeer::get_connected_host() const {
ERR_FAIL_COND_V(!is_connected_to_host() || _data->tcp.is_null(), IP_Address());
return _data->tcp->get_connected_host();
}
uint16_t WSLPeer::get_connected_port() const {
ERR_FAIL_COND_V(!is_connected_to_host() || _data->tcp.is_null(), 0);
return _data->tcp->get_connected_port();
}
void WSLPeer::set_no_delay(bool p_enabled) {
ERR_FAIL_COND(!is_connected_to_host() || _data->tcp.is_null());
_data->tcp->set_no_delay(p_enabled);
}
void WSLPeer::invalidate() {
if (_data) {
_data->valid = false;
}
}
WSLPeer::WSLPeer() {
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_data = nullptr;
_is_string = 0;
close_code = -1;
write_mode = WRITE_MODE_BINARY;
}
WSLPeer::~WSLPeer() {
close();
invalidate();
_wsl_destroy(&_data);
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_data = nullptr;
}
#endif // JAVASCRIPT_ENABLED