godot/modules/websocket/lws_peer.cpp

/*************************************************************************/
/*  lws_peer.cpp                                                         */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
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#ifndef JAVASCRIPT_ENABLED

#include "lws_peer.h"

#include "core/io/ip.h"

// Needed for socket_helpers on Android at least. UNIXes has it, just include if not windows
#if !defined(WINDOWS_ENABLED)
#include <netinet/in.h>
#include <sys/socket.h>
#endif

#include "drivers/unix/net_socket_posix.h"

void LWSPeer::set_wsi(struct lws *p_wsi, unsigned int p_in_buf_size, unsigned int p_in_pkt_size, unsigned int p_out_buf_size, unsigned int p_out_pkt_size) {
	ERR_FAIL_COND(wsi != NULL);

	_in_buffer.resize(p_in_pkt_size, p_in_buf_size);
	_out_buffer.resize(p_out_pkt_size, p_out_buf_size);
	_packet_buffer.resize((1 << MAX(p_in_buf_size, p_out_buf_size)) + LWS_PRE);
	wsi = p_wsi;
};

void LWSPeer::set_write_mode(WriteMode p_mode) {
	write_mode = p_mode;
}

LWSPeer::WriteMode LWSPeer::get_write_mode() const {
	return write_mode;
}

Error LWSPeer::read_wsi(void *in, size_t len) {

	ERR_FAIL_COND_V(!is_connected_to_host(), FAILED);

	if (lws_is_first_fragment(wsi))
		_in_size = 0;
	else if (_in_size == -1) // Trash this frame
		return ERR_FILE_CORRUPT;

	Error err = _in_buffer.write_packet((const uint8_t *)in, len, NULL);

	if (err != OK) {
		_in_buffer.discard_payload(_in_size);
		_in_size = -1;
		ERR_FAIL_V(err);
	}

	_in_size += len;

	if (lws_is_final_fragment(wsi)) {
		uint8_t is_string = lws_frame_is_binary(wsi) ? 0 : 1;
		err = _in_buffer.write_packet(NULL, _in_size, &is_string);
		if (err != OK) {
			_in_buffer.discard_payload(_in_size);
			_in_size = -1;
			ERR_FAIL_V(err);
		}
	}

	return OK;
}

Error LWSPeer::write_wsi() {

	ERR_FAIL_COND_V(!is_connected_to_host(), FAILED);

	PoolVector<uint8_t> tmp;
	int count = _out_buffer.packets_left();

	if (count == 0)
		return OK;

	int read = 0;
	uint8_t is_string = 0;
	PoolVector<uint8_t>::Write rw = _packet_buffer.write();
	_out_buffer.read_packet(&(rw[LWS_PRE]), _packet_buffer.size() - LWS_PRE, &is_string, read);

	enum lws_write_protocol mode = is_string ? LWS_WRITE_TEXT : LWS_WRITE_BINARY;
	lws_write(wsi, &(rw[LWS_PRE]), read, mode);

	if (count > 1)
		lws_callback_on_writable(wsi); // we want to write more!

	return OK;
}

Error LWSPeer::put_packet(const uint8_t *p_buffer, int p_buffer_size) {

	ERR_FAIL_COND_V(!is_connected_to_host(), FAILED);

	uint8_t is_string = write_mode == WRITE_MODE_TEXT;
	_out_buffer.write_packet(p_buffer, p_buffer_size, &is_string);
	lws_callback_on_writable(wsi); // notify that we want to write
	return OK;
};

Error LWSPeer::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;
	PoolVector<uint8_t>::Write rw = _packet_buffer.write();
	_in_buffer.read_packet(rw.ptr(), _packet_buffer.size(), &_is_string, read);

	*r_buffer = rw.ptr();
	r_buffer_size = read;

	return OK;
};

int LWSPeer::get_available_packet_count() const {

	if (!is_connected_to_host())
		return 0;

	return _in_buffer.packets_left();
};

bool LWSPeer::was_string_packet() const {

	return _is_string;
};

bool LWSPeer::is_connected_to_host() const {

	return wsi != NULL;
};

String LWSPeer::get_close_reason(void *in, size_t len, int &r_code) {
	String s;
	r_code = 0;
	if (len < 2) // From docs this should not happen
		return s;

	const uint8_t *b = (const uint8_t *)in;
	r_code = b[0] << 8 | b[1];

	if (len > 2) {
		const char *utf8 = (const char *)&b[2];
		s.parse_utf8(utf8, len - 2);
	}
	return s;
}

void LWSPeer::send_close_status(struct lws *p_wsi) {
	if (close_code == -1)
		return;

	int len = close_reason.size();
	ERR_FAIL_COND(len > 123); // Maximum allowed reason size in bytes

	lws_close_status code = (lws_close_status)close_code;
	unsigned char *reason = len > 0 ? (unsigned char *)close_reason.utf8().ptrw() : NULL;

	lws_close_reason(p_wsi, code, reason, len);

	close_code = -1;
	close_reason = "";
}

void LWSPeer::close(int p_code, String p_reason) {
	if (wsi != NULL) {
		close_code = p_code;
		close_reason = p_reason;
		PeerData *data = ((PeerData *)lws_wsi_user(wsi));
		data->force_close = true;
		data->clean_close = true;
		lws_callback_on_writable(wsi); // Notify that we want to disconnect
	} else {
		close_code = -1;
		close_reason = "";
	}
	wsi = NULL;
	_in_buffer.clear();
	_out_buffer.clear();
	_in_size = 0;
	_is_string = 0;
	_packet_buffer.resize(0);
};

IP_Address LWSPeer::get_connected_host() const {

	ERR_FAIL_COND_V(!is_connected_to_host(), IP_Address());

	IP_Address ip;
	uint16_t port = 0;

	struct sockaddr_storage addr;
	socklen_t len = sizeof(addr);

	int fd = lws_get_socket_fd(wsi);
	ERR_FAIL_COND_V(fd == -1, IP_Address());

	int ret = getpeername(fd, (struct sockaddr *)&addr, &len);
	ERR_FAIL_COND_V(ret != 0, IP_Address());

	NetSocketPosix::_set_ip_port(&addr, ip, port);

	return ip;
};

uint16_t LWSPeer::get_connected_port() const {

	ERR_FAIL_COND_V(!is_connected_to_host(), 0);

	IP_Address ip;
	uint16_t port = 0;

	struct sockaddr_storage addr;
	socklen_t len = sizeof(addr);

	int fd = lws_get_socket_fd(wsi);
	ERR_FAIL_COND_V(fd == -1, 0);

	int ret = getpeername(fd, (struct sockaddr *)&addr, &len);
	ERR_FAIL_COND_V(ret != 0, 0);

	NetSocketPosix::_set_ip_port(&addr, ip, port);

	return port;
};

LWSPeer::LWSPeer() {
	wsi = NULL;
	write_mode = WRITE_MODE_BINARY;
	close();
};

LWSPeer::~LWSPeer() {

	close();
};

#endif // JAVASCRIPT_ENABLED