628 lines
15 KiB
V
628 lines
15 KiB
V
module websocket
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import net
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import net.urllib
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import encoding.base64
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import eventbus
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import sync
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import net.websocket.logger
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const (
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l = logger.new('ws')
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)
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pub struct Client {
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retry int
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eb &eventbus.EventBus
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is_ssl bool
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// subprotocol_len int
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// cwebsocket_subprotocol *subprotocol;
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// cwebsocket_subprotocol *subprotocols[];
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mut:
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lock &sync.Mutex = sync.new_mutex()
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write_lock &sync.Mutex = sync.new_mutex()
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state State
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socket net.Socket
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flags []Flag
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sslctx &C.SSL_CTX
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ssl &C.SSL
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fragments []Fragment
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pub mut:
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uri string
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subscriber &eventbus.Subscriber
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nonce_size int = 18 // you can try 16 too
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}
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struct Fragment {
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data voidptr
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len u64
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code OPCode
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}
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pub struct Message {
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pub:
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opcode OPCode
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payload voidptr
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payload_len int
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}
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pub enum OPCode {
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continuation = 0x00
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text_frame = 0x01
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binary_frame = 0x02
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close = 0x08
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ping = 0x09
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pong = 0x0A
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}
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enum State {
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connecting = 0
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connected
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open
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closing
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closed
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}
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struct Uri {
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mut:
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hostname string
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port string
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resource string
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querystring string
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}
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enum Flag {
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has_accept
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has_connection
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has_upgrade
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}
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struct Frame {
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mut:
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fin bool
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rsv1 bool
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rsv2 bool
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rsv3 bool
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opcode OPCode
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mask bool
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payload_len u64
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masking_key [4]byte
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}
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pub fn new(uri string) &Client {
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eb := eventbus.new()
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ws := &Client{
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uri: uri
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state: .closed
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eb: eb
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subscriber: eb.subscriber
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is_ssl: uri.starts_with('wss')
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ssl: 0
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sslctx: 0
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}
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return ws
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}
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fn (ws &Client) parse_uri() &Uri {
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u := urllib.parse(ws.uri) or {
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panic(err)
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}
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v := u.request_uri().split('?')
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querystring := if v.len > 1 { '?' + v[1] } else { '' }
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return &Uri{
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hostname: u.hostname()
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port: u.port()
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resource: v[0]
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querystring: querystring
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}
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}
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pub fn (mut ws Client) connect() int {
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match ws.state {
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.connected {
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l.f('connect: websocket already connected')
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}
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.connecting {
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l.f('connect: websocket already connecting')
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}
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.open {
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l.f('connect: websocket already open')
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}
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else {
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// do nothing
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}
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}
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ws.lock.lock()
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ws.state = .connecting
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ws.lock.unlock()
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uri := ws.parse_uri()
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nonce := get_nonce(ws.nonce_size)
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seckey := base64.encode(nonce)
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ai_family := C.AF_INET
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ai_socktype := C.SOCK_STREAM
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l.d('handshake header:')
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handshake := 'GET ${uri.resource}${uri.querystring} HTTP/1.1\r\nHost: ${uri.hostname}:${uri.port}\r\nUpgrade: websocket\r\nConnection: Upgrade\r\nSec-WebSocket-Key: ${seckey}\r\nSec-WebSocket-Version: 13\r\n\r\n'
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l.d(handshake)
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socket := net.new_socket(ai_family, ai_socktype, 0) or {
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l.f(err)
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return -1
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}
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ws.socket = socket
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ws.socket.connect(uri.hostname, uri.port.int()) or {
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l.f(err)
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return -1
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}
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optval := 1
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ws.socket.setsockopt(C.SOL_SOCKET, C.SO_KEEPALIVE, &optval) or {
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l.f(err)
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return -1
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}
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if ws.is_ssl {
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ws.connect_ssl()
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}
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ws.lock.lock()
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ws.state = .connected
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ws.lock.unlock()
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res := ws.write_to_server(handshake.str, handshake.len)
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if res <= 0 {
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l.f('Handshake failed.')
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}
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ws.read_handshake(seckey)
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ws.lock.lock()
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ws.state = .open
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ws.lock.unlock()
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ws.send_open_event()
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unsafe {
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handshake.free()
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nonce.free()
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free(uri)
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}
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return 0
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}
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pub fn (mut ws Client) close(code int, message string) {
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if ws.state != .closed && ws.socket.sockfd > 1 {
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ws.lock.lock()
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ws.state = .closing
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ws.lock.unlock()
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mut code32 := 0
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if code > 0 {
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code_ := C.htons(code)
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message_len := message.len + 2
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mut close_frame := [`0`].repeat(message_len)
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close_frame[0] = byte(code_ & 0xFF)
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close_frame[1] = byte(code_ >> 8)
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code32 = (close_frame[0] << 8) + close_frame[1]
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for i in 0 .. message.len {
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close_frame[i + 2] = message[i]
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}
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ws.send_control_frame(.close, 'CLOSE', close_frame)
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} else {
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ws.send_control_frame(.close, 'CLOSE', [])
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}
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if ws.ssl != 0 {
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C.SSL_shutdown(ws.ssl)
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C.SSL_free(ws.ssl)
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if ws.sslctx != 0 {
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C.SSL_CTX_free(ws.sslctx)
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}
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} else {
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if C.shutdown(ws.socket.sockfd, C.SHUT_WR) == -1 {
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l.e('Unabled to shutdown websocket.')
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}
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mut buf := [`0`]
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for ws.read_from_server(buf.data, 1) > 0 {
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buf[0] = `\0`
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}
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unsafe {
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buf.free()
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}
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if C.close(ws.socket.sockfd) == -1 {
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// ws.send_close_event()(websocket, 1011, strerror(C.errno));
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}
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}
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ws.fragments = []
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ws.send_close_event()
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ws.lock.lock()
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ws.state = .closed
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ws.lock.unlock()
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unsafe {
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}
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// TODO impl autoreconnect
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}
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}
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pub fn (mut ws Client) write(payload byteptr, payload_len int, code OPCode) int {
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mut bytes_written := -1
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if ws.state != .open {
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ws.send_error_event('WebSocket closed. Cannot write.')
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unsafe {
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free(payload)
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}
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return -1
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}
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header_len := 6 + if payload_len > 125 { 2 } else { 0 } + if payload_len > 0xffff { 6 } else { 0 }
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frame_len := header_len + payload_len
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mut frame_buf := [`0`].repeat(frame_len)
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fbdata := byteptr( frame_buf.data )
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masking_key := create_masking_key()
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mut header := [`0`].repeat(header_len)
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header[0] = byte(code) | 0x80
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if payload_len <= 125 {
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header[1] = byte(payload_len | 0x80)
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header[2] = masking_key[0]
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header[3] = masking_key[1]
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header[4] = masking_key[2]
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header[5] = masking_key[3]
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} else if payload_len > 125 && payload_len <= 0xffff {
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len16 := C.htons(payload_len)
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header[1] = (126 | 0x80)
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C.memcpy(header.data + 2, &len16, 2)
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header[4] = masking_key[0]
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header[5] = masking_key[1]
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header[6] = masking_key[2]
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header[7] = masking_key[3]
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} else if payload_len > 0xffff && payload_len <= 0xffffffffffffffff { // 65535 && 18446744073709551615
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len64 := htonl64(u64(payload_len))
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header[1] = (127 | 0x80)
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C.memcpy(header.data + 2, len64, 8)
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header[10] = masking_key[0]
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header[11] = masking_key[1]
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header[12] = masking_key[2]
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header[13] = masking_key[3]
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} else {
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l.c('write: frame too large')
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ws.close(1009, 'frame too large')
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goto free_data
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return -1
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}
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C.memcpy(fbdata, header.data, header_len)
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C.memcpy(fbdata + header_len, payload, payload_len)
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for i in 0 .. payload_len {
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frame_buf[header_len + i] ^= masking_key[i % 4] & 0xff
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}
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bytes_written = ws.write_to_server(fbdata, frame_len)
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if bytes_written == -1 {
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err := string(byteptr(C.strerror(C.errno)))
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l.e('write: there was an error writing data: ${err}')
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ws.send_error_event('Error writing data')
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goto free_data
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return -1
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}
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l.d('write: ${bytes_written} bytes written.')
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free_data:
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unsafe {
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free(payload)
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frame_buf.free()
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header.free()
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masking_key.free()
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}
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return bytes_written
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}
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pub fn (mut ws Client) listen() {
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l.i('Starting listener...')
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for ws.state == .open {
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ws.read()
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}
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l.i('Listener stopped as websocket was closed.')
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}
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pub fn (mut ws Client) read() int {
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mut bytes_read := u64(0)
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initial_buffer := u64(256)
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mut header_len := 2
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header_len_offset := 2
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extended_payload16_end_byte := 4
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extended_payload64_end_byte := 10
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mut payload_len := u64(0)
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mut data := C.calloc(initial_buffer, 1) // [`0`].repeat(int(max_buffer))
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mut frame := Frame{}
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mut frame_size := u64(header_len)
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for bytes_read < frame_size && ws.state == .open {
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byt := ws.read_from_server(data + int(bytes_read), 1)
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match byt {
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0 {
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error := 'server closed the connection.'
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l.e('read: ${error}')
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ws.send_error_event(error)
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ws.close(1006, error)
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goto free_data
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return -1
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}
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-1 {
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err := string(byteptr(C.strerror(C.errno)))
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l.e('read: error reading frame. ${err}')
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ws.send_error_event('error reading frame')
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goto free_data
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return -1
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}
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else {
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bytes_read++
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}
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}
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if bytes_read == u64(header_len_offset) {
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frame.fin = (data[0] & 0x80) == 0x80
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frame.rsv1 = (data[0] & 0x40) == 0x40
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frame.rsv2 = (data[0] & 0x20) == 0x20
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frame.rsv3 = (data[0] & 0x10) == 0x10
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frame.opcode = OPCode(int(data[0] & 0x7F))
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frame.mask = (data[1] & 0x80) == 0x80
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frame.payload_len = u64(data[1] & 0x7F)
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// masking key
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if frame.mask {
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frame.masking_key[0] = data[2]
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frame.masking_key[1] = data[3]
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frame.masking_key[2] = data[4]
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frame.masking_key[3] = data[5]
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}
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payload_len = frame.payload_len
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frame_size = u64(header_len) + payload_len
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}
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if frame.payload_len == u64(126) && bytes_read == u64(extended_payload16_end_byte) {
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header_len += 2
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mut extended_payload_len := 0
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extended_payload_len |= data[2] << 8
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extended_payload_len |= data[3] << 0
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// masking key
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if frame.mask {
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frame.masking_key[0] = data[4]
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frame.masking_key[1] = data[5]
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frame.masking_key[2] = data[6]
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frame.masking_key[3] = data[7]
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}
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payload_len = u64(extended_payload_len)
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frame_size = u64(header_len) + payload_len
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if frame_size > initial_buffer {
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l.d('reallocating: ${frame_size}')
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data = C.realloc(data, frame_size)
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}
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} else if frame.payload_len == u64(127) && bytes_read == u64(extended_payload64_end_byte) {
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header_len += 8 // TODO Not sure...
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mut extended_payload_len := u64(0)
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extended_payload_len |= u64(data[2]) << 56
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extended_payload_len |= u64(data[3]) << 48
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extended_payload_len |= u64(data[4]) << 40
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extended_payload_len |= u64(data[5]) << 32
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extended_payload_len |= u64(data[6]) << 24
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extended_payload_len |= u64(data[7]) << 16
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extended_payload_len |= u64(data[8]) << 8
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extended_payload_len |= u64(data[9]) << 0
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// masking key
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if frame.mask {
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frame.masking_key[0] = data[10]
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frame.masking_key[1] = data[11]
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frame.masking_key[2] = data[12]
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frame.masking_key[3] = data[13]
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}
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payload_len = extended_payload_len
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frame_size = u64(header_len) + payload_len
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if frame_size > initial_buffer {
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l.d('reallocating: ${frame_size}')
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data = C.realloc(data, frame_size)
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}
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}
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}
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// unmask the payload
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if frame.mask {
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for i in 0 .. payload_len {
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data[header_len + i] ^= frame.masking_key[i % 4] & 0xff
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}
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}
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if ws.fragments.len > 0 && frame.opcode in [.text_frame, .binary_frame] {
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ws.close(0, '')
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goto free_data
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return -1
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} else if frame.opcode in [.text_frame, .binary_frame] {
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data_node:
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l.d('read: recieved text_frame or binary_frame')
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mut payload := malloc(int(sizeof(byte) * u32(payload_len) + 1))
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if payload == 0 {
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l.f('out of memory')
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}
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C.memcpy(payload, &data[header_len], payload_len)
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if frame.fin {
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if ws.fragments.len > 0 {
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// join fragments
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ws.fragments << Fragment{
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data: payload
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len: payload_len
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}
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mut frags := []Fragment{}
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mut size := u64(0)
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for f in ws.fragments {
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if f.len > 0 {
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frags << f
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size += f.len
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}
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}
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mut pl := malloc(int(sizeof(byte) * u32(size)))
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if pl == 0 {
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l.f('out of memory')
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}
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mut by := 0
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for f in frags {
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C.memcpy(pl + by, f.data, f.len)
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by += int(f.len)
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unsafe {
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free(f.data)
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}
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}
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payload = pl
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frame.opcode = ws.fragments[0].code
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payload_len = size
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// clear the fragments
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unsafe {
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ws.fragments.free()
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}
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ws.fragments = []
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}
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payload[payload_len] = `\0`
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if frame.opcode == .text_frame && payload_len > 0 {
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if !utf8_validate(payload, int(payload_len)) {
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l.e('malformed utf8 payload')
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ws.send_error_event('Recieved malformed utf8.')
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ws.close(1007, 'malformed utf8 payload')
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goto free_data
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return -1
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}
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}
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message := Message{
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opcode: frame.opcode
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payload: payload
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payload_len: int(payload_len)
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}
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ws.send_message_event(message)
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} else {
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// fragment start.
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ws.fragments << Fragment{
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data: payload
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len: payload_len
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code: frame.opcode
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}
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}
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unsafe {
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free(data)
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}
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return int(bytes_read)
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} else if frame.opcode == .continuation {
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l.d('read: continuation')
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if ws.fragments.len <= 0 {
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l.e('Nothing to continue.')
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ws.close(1002, 'nothing to continue')
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goto free_data
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return -1
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}
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goto data_node
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return 0
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} else if frame.opcode == .ping {
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l.d('read: ping')
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if !frame.fin {
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ws.close(1002, 'control message must not be fragmented')
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goto free_data
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return -1
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}
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if frame.payload_len > 125 {
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ws.close(1002, 'control frames must not exceed 125 bytes')
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goto free_data
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return -1
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}
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mut payload := []byte{}
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if payload_len > 0 {
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payload = [`0`].repeat(int(payload_len))
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C.memcpy(payload.data, &data[header_len], payload_len)
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}
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unsafe {
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free(data)
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}
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return ws.send_control_frame(.pong, 'PONG', payload)
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} else if frame.opcode == .pong {
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if !frame.fin {
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ws.close(1002, 'control message must not be fragmented')
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goto free_data
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return -1
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}
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unsafe {
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free(data)
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}
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// got pong
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return 0
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} else if frame.opcode == .close {
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l.d('read: close')
|
|
if frame.payload_len > 125 {
|
|
ws.close(1002, 'control frames must not exceed 125 bytes')
|
|
goto free_data
|
|
return -1
|
|
}
|
|
mut code := 0
|
|
mut reason := ''
|
|
if payload_len > 2 {
|
|
code = (int(data[header_len]) << 8) + int(data[header_len + 1])
|
|
header_len += 2
|
|
payload_len -= 2
|
|
reason = string(&data[header_len])
|
|
l.i('Closing with reason: ${reason} & code: ${code}')
|
|
if reason.len > 1 && !utf8_validate(reason.str, reason.len) {
|
|
l.e('malformed utf8 payload')
|
|
ws.send_error_event('Recieved malformed utf8.')
|
|
ws.close(1007, 'malformed utf8 payload')
|
|
goto free_data
|
|
return -1
|
|
}
|
|
}
|
|
unsafe {
|
|
free(data)
|
|
}
|
|
ws.close(code, reason)
|
|
return 0
|
|
}
|
|
l.e('read: Recieved unsupported opcode: ${frame.opcode} fin: ${frame.fin} uri: ${ws.uri}')
|
|
ws.send_error_event('Recieved unsupported opcode: ${frame.opcode}')
|
|
ws.close(1002, 'Unsupported opcode')
|
|
free_data:
|
|
unsafe {
|
|
free(data)
|
|
}
|
|
return -1
|
|
}
|
|
|
|
fn (mut ws Client) send_control_frame(code OPCode, frame_typ string, payload []byte) int {
|
|
mut bytes_written := -1
|
|
if ws.socket.sockfd <= 0 {
|
|
l.e('No socket opened.')
|
|
unsafe {
|
|
payload.free()
|
|
}
|
|
l.c('send_control_frame: error sending ${frame_typ} control frame.')
|
|
return -1
|
|
}
|
|
header_len := 6
|
|
frame_len := header_len + payload.len
|
|
mut control_frame := [`0`].repeat(frame_len)
|
|
masking_key := create_masking_key()
|
|
control_frame[0] = byte(code | 0x80)
|
|
control_frame[1] = byte(payload.len | 0x80)
|
|
control_frame[2] = masking_key[0]
|
|
control_frame[3] = masking_key[1]
|
|
control_frame[4] = masking_key[2]
|
|
control_frame[5] = masking_key[3]
|
|
if code == .close {
|
|
if payload.len > 2 {
|
|
mut parsed_payload := [`0`].repeat(payload.len + 1)
|
|
C.memcpy(parsed_payload.data, &payload[0], payload.len)
|
|
parsed_payload[payload.len] = `\0`
|
|
for i in 0 .. payload.len {
|
|
control_frame[6 + i] = (parsed_payload[i] ^ masking_key[i % 4]) & 0xff
|
|
}
|
|
unsafe {
|
|
parsed_payload.free()
|
|
}
|
|
}
|
|
} else {
|
|
for i in 0 .. payload.len {
|
|
control_frame[header_len + i] = (payload[i] ^ masking_key[i % 4]) & 0xff
|
|
}
|
|
}
|
|
bytes_written = ws.write_to_server(control_frame.data, frame_len)
|
|
free_data:
|
|
unsafe {
|
|
control_frame.free()
|
|
payload.free()
|
|
masking_key.free()
|
|
}
|
|
match bytes_written {
|
|
0 {
|
|
l.d('send_control_frame: remote host closed the connection.')
|
|
return 0
|
|
}
|
|
-1 {
|
|
l.c('send_control_frame: error sending ${frame_typ} control frame.')
|
|
return -1
|
|
}
|
|
else {
|
|
l.d('send_control_frame: wrote ${bytes_written} byte ${frame_typ} frame.')
|
|
return bytes_written
|
|
}
|
|
}
|
|
}
|