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Diffstat (limited to 'src/wscat.go')
-rw-r--r--src/wscat.go470
1 files changed, 12 insertions, 458 deletions
diff --git a/src/wscat.go b/src/wscat.go
index 6ed0aea..4cf63cb 100644
--- a/src/wscat.go
+++ b/src/wscat.go
@@ -7,7 +7,6 @@ import (
"context"
"crypto/rand"
"crypto/sha1"
- "crypto/tls"
"encoding/base64"
"encoding/binary"
"encoding/json"
@@ -16,7 +15,6 @@ import (
"io"
"net"
"net/http"
- "net/http/httptrace"
"net/url"
"os"
"strconv"
@@ -29,99 +27,12 @@ import (
g "gobang"
)
+
+
// ErrBadHandshake is returned when the server response to opening handshake is
// invalid.
var ErrBadHandshake = errors.New("websocket: bad handshake")
-var errInvalidCompression = errors.New("websocket: invalid compression negotiation")
-
-// NewClient creates a new client connection using the given net connection.
-// The URL u specifies the host and request URI. Use requestHeader to specify
-// the origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies
-// (Cookie). Use the response.Header to get the selected subprotocol
-// (Sec-WebSocket-Protocol) and cookies (Set-Cookie).
-//
-// If the WebSocket handshake fails, ErrBadHandshake is returned along with a
-// non-nil *http.Response so that callers can handle redirects, authentication,
-// etc.
-//
-// Deprecated: Use Dialer instead.
-func NewClient(netConn net.Conn, u *url.URL, requestHeader http.Header, readBufSize, writeBufSize int) (c *Conn, response *http.Response, err error) {
- d := Dialer{
- ReadBufferSize: readBufSize,
- WriteBufferSize: writeBufSize,
- NetDial: func(net, addr string) (net.Conn, error) {
- return netConn, nil
- },
- }
- return d.Dial(u.String(), requestHeader)
-}
-
-// A Dialer contains options for connecting to WebSocket server.
-//
-// It is safe to call Dialer's methods concurrently.
-type Dialer struct {
- // NetDial specifies the dial function for creating TCP connections. If
- // NetDial is nil, net.Dialer DialContext is used.
- NetDial func(network, addr string) (net.Conn, error)
-
- // NetDialContext specifies the dial function for creating TCP connections. If
- // NetDialContext is nil, NetDial is used.
- NetDialContext func(ctx context.Context, network, addr string) (net.Conn, error)
-
- // NetDialTLSContext specifies the dial function for creating TLS/TCP connections. If
- // NetDialTLSContext is nil, NetDialContext is used.
- // If NetDialTLSContext is set, Dial assumes the TLS handshake is done there and
- // TLSClientConfig is ignored.
- NetDialTLSContext func(ctx context.Context, network, addr string) (net.Conn, error)
-
- // TLSClientConfig specifies the TLS configuration to use with tls.Client.
- // If nil, the default configuration is used.
- // If either NetDialTLS or NetDialTLSContext are set, Dial assumes the TLS handshake
- // is done there and TLSClientConfig is ignored.
- TLSClientConfig *tls.Config
-
- // HandshakeTimeout specifies the duration for the handshake to complete.
- HandshakeTimeout time.Duration
-
- // ReadBufferSize and WriteBufferSize specify I/O buffer sizes in bytes. If a buffer
- // size is zero, then a useful default size is used. The I/O buffer sizes
- // do not limit the size of the messages that can be sent or received.
- ReadBufferSize, WriteBufferSize int
-
- // WriteBufferPool is a pool of buffers for write operations. If the value
- // is not set, then write buffers are allocated to the connection for the
- // lifetime of the connection.
- //
- // A pool is most useful when the application has a modest volume of writes
- // across a large number of connections.
- //
- // Applications should use a single pool for each unique value of
- // WriteBufferSize.
- WriteBufferPool BufferPool
-
- // Subprotocols specifies the client's requested subprotocols.
- Subprotocols []string
-
- // EnableCompression specifies if the client should attempt to negotiate
- // per message compression (RFC 7692). Setting this value to true does not
- // guarantee that compression will be supported. Currently only "no context
- // takeover" modes are supported.
- EnableCompression bool
-
- // Jar specifies the cookie jar.
- // If Jar is nil, cookies are not sent in requests and ignored
- // in responses.
- Jar http.CookieJar
-}
-
-// Dial creates a new client connection by calling DialContext with a background context.
-func (d *Dialer) Dial(urlStr string, requestHeader http.Header) (*Conn, *http.Response, error) {
- return d.DialContext(context.Background(), urlStr, requestHeader)
-}
-
-var errMalformedURL = errors.New("malformed ws or wss URL")
-
func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) {
hostPort = u.Host
hostNoPort = u.Host
@@ -140,293 +51,6 @@ func hostPortNoPort(u *url.URL) (hostPort, hostNoPort string) {
return hostPort, hostNoPort
}
-// DefaultDialer is a dialer with all fields set to the default values.
-var DefaultDialer = &Dialer{
- HandshakeTimeout: 45 * time.Second,
-}
-
-// nilDialer is dialer to use when receiver is nil.
-var nilDialer = *DefaultDialer
-
-// DialContext creates a new client connection. Use requestHeader to specify the
-// origin (Origin), subprotocols (Sec-WebSocket-Protocol) and cookies (Cookie).
-// Use the response.Header to get the selected subprotocol
-// (Sec-WebSocket-Protocol) and cookies (Set-Cookie).
-//
-// The context will be used in the request and in the Dialer.
-//
-// If the WebSocket handshake fails, ErrBadHandshake is returned along with a
-// non-nil *http.Response so that callers can handle redirects, authentication,
-// etcetera. The response body may not contain the entire response and does not
-// need to be closed by the application.
-func (d *Dialer) DialContext(ctx context.Context, urlStr string, requestHeader http.Header) (*Conn, *http.Response, error) {
- if d == nil {
- d = &nilDialer
- }
-
- challengeKey, err := generateChallengeKey()
- if err != nil {
- return nil, nil, err
- }
-
- u, err := url.Parse(urlStr)
- if err != nil {
- return nil, nil, err
- }
-
- switch u.Scheme {
- case "ws":
- u.Scheme = "http"
- case "wss":
- u.Scheme = "https"
- default:
- return nil, nil, errMalformedURL
- }
-
- if u.User != nil {
- // User name and password are not allowed in websocket URIs.
- return nil, nil, errMalformedURL
- }
-
- req := &http.Request{
- Method: http.MethodGet,
- URL: u,
- Proto: "HTTP/1.1",
- ProtoMajor: 1,
- ProtoMinor: 1,
- Header: make(http.Header),
- Host: u.Host,
- }
- req = req.WithContext(ctx)
-
- // Set the cookies present in the cookie jar of the dialer
- if d.Jar != nil {
- for _, cookie := range d.Jar.Cookies(u) {
- req.AddCookie(cookie)
- }
- }
-
- // Set the request headers using the capitalization for names and values in
- // RFC examples. Although the capitalization shouldn't matter, there are
- // servers that depend on it. The Header.Set method is not used because the
- // method canonicalizes the header names.
- req.Header["Upgrade"] = []string{"websocket"}
- req.Header["Connection"] = []string{"Upgrade"}
- req.Header["Sec-WebSocket-Key"] = []string{challengeKey}
- req.Header["Sec-WebSocket-Version"] = []string{"13"}
- if len(d.Subprotocols) > 0 {
- req.Header["Sec-WebSocket-Protocol"] = []string{strings.Join(d.Subprotocols, ", ")}
- }
- for k, vs := range requestHeader {
- switch {
- case k == "Host":
- if len(vs) > 0 {
- req.Host = vs[0]
- }
- case k == "Upgrade" ||
- k == "Connection" ||
- k == "Sec-Websocket-Key" ||
- k == "Sec-Websocket-Version" ||
- k == "Sec-Websocket-Extensions" ||
- (k == "Sec-Websocket-Protocol" && len(d.Subprotocols) > 0):
- return nil, nil, errors.New("websocket: duplicate header not allowed: " + k)
- case k == "Sec-Websocket-Protocol":
- req.Header["Sec-WebSocket-Protocol"] = vs
- default:
- req.Header[k] = vs
- }
- }
-
- if d.EnableCompression {
- req.Header["Sec-WebSocket-Extensions"] = []string{"permessage-deflate; server_no_context_takeover; client_no_context_takeover"}
- }
-
- if d.HandshakeTimeout != 0 {
- var cancel func()
- ctx, cancel = context.WithTimeout(ctx, d.HandshakeTimeout)
- defer cancel()
- }
-
- var netDial netDialerFunc
- switch {
- case u.Scheme == "https" && d.NetDialTLSContext != nil:
- netDial = d.NetDialTLSContext
- case d.NetDialContext != nil:
- netDial = d.NetDialContext
- case d.NetDial != nil:
- netDial = func(ctx context.Context, net, addr string) (net.Conn, error) {
- return d.NetDial(net, addr)
- }
- default:
- netDial = (&net.Dialer{}).DialContext
- }
-
- // If needed, wrap the dial function to set the connection deadline.
- if deadline, ok := ctx.Deadline(); ok {
- forwardDial := netDial
- netDial = func(ctx context.Context, network, addr string) (net.Conn, error) {
- c, err := forwardDial(ctx, network, addr)
- if err != nil {
- return nil, err
- }
- err = c.SetDeadline(deadline)
- if err != nil {
- c.Close()
- return nil, err
- }
- return c, nil
- }
- }
-
- hostPort, hostNoPort := hostPortNoPort(u)
- trace := httptrace.ContextClientTrace(ctx)
- if trace != nil && trace.GetConn != nil {
- trace.GetConn(hostPort)
- }
-
- netConn, err := netDial(ctx, "tcp", hostPort)
- if err != nil {
- return nil, nil, err
- }
- if trace != nil && trace.GotConn != nil {
- trace.GotConn(httptrace.GotConnInfo{
- Conn: netConn,
- })
- }
-
- // Close the network connection when returning an error. The variable
- // netConn is set to nil before the success return at the end of the
- // function.
- defer func() {
- if netConn != nil {
- // It's safe to ignore the error from Close() because this code is
- // only executed when returning a more important error to the
- // application.
- _ = netConn.Close()
- }
- }()
-
- if u.Scheme == "https" && d.NetDialTLSContext == nil {
- // If NetDialTLSContext is set, assume that the TLS handshake has already been done
-
- cfg := cloneTLSConfig(d.TLSClientConfig)
- if cfg.ServerName == "" {
- cfg.ServerName = hostNoPort
- }
- tlsConn := tls.Client(netConn, cfg)
- netConn = tlsConn
-
- if trace != nil && trace.TLSHandshakeStart != nil {
- trace.TLSHandshakeStart()
- }
- err := doHandshake(ctx, tlsConn, cfg)
- if trace != nil && trace.TLSHandshakeDone != nil {
- trace.TLSHandshakeDone(tlsConn.ConnectionState(), err)
- }
-
- if err != nil {
- return nil, nil, err
- }
- }
-
- conn := newConn(netConn, false, d.ReadBufferSize, d.WriteBufferSize, d.WriteBufferPool, nil, nil)
-
- if err := req.Write(netConn); err != nil {
- return nil, nil, err
- }
-
- if trace != nil && trace.GotFirstResponseByte != nil {
- if peek, err := conn.br.Peek(1); err == nil && len(peek) == 1 {
- trace.GotFirstResponseByte()
- }
- }
-
- resp, err := http.ReadResponse(conn.br, req)
- if err != nil {
- if d.TLSClientConfig != nil {
- for _, proto := range d.TLSClientConfig.NextProtos {
- if proto != "http/1.1" {
- return nil, nil, fmt.Errorf(
- "websocket: protocol %q was given but is not supported;"+
- "sharing tls.Config with net/http Transport can cause this error: %w",
- proto, err,
- )
- }
- }
- }
- return nil, nil, err
- }
-
- if d.Jar != nil {
- if rc := resp.Cookies(); len(rc) > 0 {
- d.Jar.SetCookies(u, rc)
- }
- }
-
- if resp.StatusCode != 101 ||
- !tokenListContainsValue(resp.Header, "Upgrade", "websocket") ||
- !tokenListContainsValue(resp.Header, "Connection", "upgrade") ||
- resp.Header.Get("Sec-Websocket-Accept") != computeAcceptKey(challengeKey) {
- // Before closing the network connection on return from this
- // function, slurp up some of the response to aid application
- // debugging.
- buf := make([]byte, 1024)
- n, _ := io.ReadFull(resp.Body, buf)
- resp.Body = io.NopCloser(bytes.NewReader(buf[:n]))
- return nil, resp, ErrBadHandshake
- }
-
- for _, ext := range parseExtensions(resp.Header) {
- if ext[""] != "permessage-deflate" {
- continue
- }
- _, snct := ext["server_no_context_takeover"]
- _, cnct := ext["client_no_context_takeover"]
- if !snct || !cnct {
- return nil, resp, errInvalidCompression
- }
- conn.newCompressionWriter = compressNoContextTakeover
- conn.newDecompressionReader = decompressNoContextTakeover
- break
- }
-
- resp.Body = io.NopCloser(bytes.NewReader([]byte{}))
- conn.subprotocol = resp.Header.Get("Sec-Websocket-Protocol")
-
- if err := netConn.SetDeadline(time.Time{}); err != nil {
- return nil, resp, err
- }
-
- // Success! Set netConn to nil to stop the deferred function above from
- // closing the network connection.
- netConn = nil
-
- return conn, resp, nil
-}
-
-func cloneTLSConfig(cfg *tls.Config) *tls.Config {
- if cfg == nil {
- return &tls.Config{}
- }
- return cfg.Clone()
-}
-
-func doHandshake(ctx context.Context, tlsConn *tls.Conn, cfg *tls.Config) error {
- if err := tlsConn.HandshakeContext(ctx); err != nil {
- return err
- }
- if !cfg.InsecureSkipVerify {
- if err := tlsConn.VerifyHostname(cfg.ServerName); err != nil {
- return err
- }
- }
- return nil
-}
-// Copyright 2017 The Gorilla WebSocket Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-
const (
minCompressionLevel = -2 // flate.HuffmanOnly not defined in Go < 1.6
maxCompressionLevel = flate.BestCompression
@@ -565,10 +189,6 @@ func (r *flateReadWrapper) Close() error {
r.fr = nil
return err
}
-// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
const (
// Frame header byte 0 bits from Section 5.2 of RFC 6455
@@ -2287,70 +1907,6 @@ func (fn netDialerFunc) DialContext(ctx context.Context, network, addr string) (
return fn(ctx, network, addr)
}
-type httpProxyDialer struct {
- proxyURL *url.URL
- forwardDial netDialerFunc
-}
-
-func (hpd *httpProxyDialer) DialContext(ctx context.Context, network string, addr string) (net.Conn, error) {
- hostPort, _ := hostPortNoPort(hpd.proxyURL)
- conn, err := hpd.forwardDial(ctx, network, hostPort)
- if err != nil {
- return nil, err
- }
-
- connectHeader := make(http.Header)
- if user := hpd.proxyURL.User; user != nil {
- proxyUser := user.Username()
- if proxyPassword, passwordSet := user.Password(); passwordSet {
- credential := base64.StdEncoding.EncodeToString([]byte(proxyUser + ":" + proxyPassword))
- connectHeader.Set("Proxy-Authorization", "Basic "+credential)
- }
- }
-
- connectReq := &http.Request{
- Method: http.MethodConnect,
- URL: &url.URL{Opaque: addr},
- Host: addr,
- Header: connectHeader,
- }
-
- if err := connectReq.Write(conn); err != nil {
- conn.Close()
- return nil, err
- }
-
- // Read response. It's OK to use and discard buffered reader here because
- // the remote server does not speak until spoken to.
- br := bufio.NewReader(conn)
- resp, err := http.ReadResponse(br, connectReq)
- if err != nil {
- conn.Close()
- return nil, err
- }
-
- // Close the response body to silence false positives from linters. Reset
- // the buffered reader first to ensure that Close() does not read from
- // conn.
- // Note: Applications must call resp.Body.Close() on a response returned
- // http.ReadResponse to inspect trailers or read another response from the
- // buffered reader. The call to resp.Body.Close() does not release
- // resources.
- br.Reset(bytes.NewReader(nil))
- _ = resp.Body.Close()
-
- if resp.StatusCode != http.StatusOK {
- _ = conn.Close()
- f := strings.SplitN(resp.Status, " ", 2)
- return nil, errors.New(f[1])
- }
- return conn, nil
-}
-// Copyright 2013 The Gorilla WebSocket Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-
// HandshakeError describes an error with the handshake from the peer.
type HandshakeError struct {
message string
@@ -3010,7 +2566,7 @@ var EmitActiveConnection = g.MakeGauge("active-connections")
-func ParseArgs(args []string) CLIArgs {
+func parseArgs(args []string) CLIArgs {
if len(args) != 3 {
fmt.Fprintf(
os.Stderr,
@@ -3038,12 +2594,11 @@ func copyData(c chan struct {}, from io.Reader, to io.WriteCloser) {
}
func Start(toAddr string, listener net.Listener) {
- /*
- upgrader := websocket.Upgrader {}
+ upgrader := Upgrader {}
http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
connFrom, err := upgrader.Upgrade(w, r, nil)
if err != nil {
- g.Warning(
+ g.Error(
"Error upgrading connection",
"upgrade-connection-error",
"err", err,
@@ -3057,16 +2612,16 @@ func Start(toAddr string, listener net.Listener) {
if err != nil {
g.Error(
"Error dialing connection",
- "dial-connection",
+ "dial-connection-error",
"err", err,
)
- os.Exit(1)
+ return
}
defer connTo.Close()
messageType, reader, err := connFrom.NextReader()
if err != nil {
- g.Warning(
+ g.Error(
"Failed to get next reader from connection",
"connection-next-reader-error",
"err", err,
@@ -3076,9 +2631,9 @@ func Start(toAddr string, listener net.Listener) {
writer, err := connFrom.NextWriter(messageType)
if err != nil {
- g.Warning(
- "Failed to get next reader from connection",
- "connection-next-reader-error",
+ g.Error(
+ "Failed to get next writer from connection",
+ "connection-next-writer-error",
"err", err,
)
return
@@ -3097,13 +2652,12 @@ func Start(toAddr string, listener net.Listener) {
server := http.Server{}
err := server.Serve(listener)
g.FatalIf(err)
- */
}
func Main() {
g.Init()
- args := ParseArgs(os.Args)
+ args := parseArgs(os.Args)
listener := Listen(args.FromAddr)
Start(args.ToAddr, listener)
}
generated by cgit v1.2.3 (git 2.49.0) at 2025-07-06 14:39:25 +0000