--- /dev/null
+// Code generated by golang.org/x/tools/cmd/bundle. DO NOT EDIT.
+//go:generate bundle -o x_net_proxy.go golang.org/x/net/proxy
+
+// Package proxy provides support for a variety of protocols to proxy network
+// data.
+//
+
+package websocket
+
+import (
+ "errors"
+ "io"
+ "net"
+ "net/url"
+ "os"
+ "strconv"
+ "strings"
+ "sync"
+)
+
+type proxy_direct struct{}
+
+// Direct is a direct proxy: one that makes network connections directly.
+var proxy_Direct = proxy_direct{}
+
+func (proxy_direct) Dial(network, addr string) (net.Conn, error) {
+ return net.Dial(network, addr)
+}
+
+// A PerHost directs connections to a default Dialer unless the host name
+// requested matches one of a number of exceptions.
+type proxy_PerHost struct {
+ def, bypass proxy_Dialer
+
+ bypassNetworks []*net.IPNet
+ bypassIPs []net.IP
+ bypassZones []string
+ bypassHosts []string
+}
+
+// NewPerHost returns a PerHost Dialer that directs connections to either
+// defaultDialer or bypass, depending on whether the connection matches one of
+// the configured rules.
+func proxy_NewPerHost(defaultDialer, bypass proxy_Dialer) *proxy_PerHost {
+ return &proxy_PerHost{
+ def: defaultDialer,
+ bypass: bypass,
+ }
+}
+
+// Dial connects to the address addr on the given network through either
+// defaultDialer or bypass.
+func (p *proxy_PerHost) Dial(network, addr string) (c net.Conn, err error) {
+ host, _, err := net.SplitHostPort(addr)
+ if err != nil {
+ return nil, err
+ }
+
+ return p.dialerForRequest(host).Dial(network, addr)
+}
+
+func (p *proxy_PerHost) dialerForRequest(host string) proxy_Dialer {
+ if ip := net.ParseIP(host); ip != nil {
+ for _, net := range p.bypassNetworks {
+ if net.Contains(ip) {
+ return p.bypass
+ }
+ }
+ for _, bypassIP := range p.bypassIPs {
+ if bypassIP.Equal(ip) {
+ return p.bypass
+ }
+ }
+ return p.def
+ }
+
+ for _, zone := range p.bypassZones {
+ if strings.HasSuffix(host, zone) {
+ return p.bypass
+ }
+ if host == zone[1:] {
+ // For a zone ".example.com", we match "example.com"
+ // too.
+ return p.bypass
+ }
+ }
+ for _, bypassHost := range p.bypassHosts {
+ if bypassHost == host {
+ return p.bypass
+ }
+ }
+ return p.def
+}
+
+// AddFromString parses a string that contains comma-separated values
+// specifying hosts that should use the bypass proxy. Each value is either an
+// IP address, a CIDR range, a zone (*.example.com) or a host name
+// (localhost). A best effort is made to parse the string and errors are
+// ignored.
+func (p *proxy_PerHost) AddFromString(s string) {
+ hosts := strings.Split(s, ",")
+ for _, host := range hosts {
+ host = strings.TrimSpace(host)
+ if len(host) == 0 {
+ continue
+ }
+ if strings.Contains(host, "/") {
+ // We assume that it's a CIDR address like 127.0.0.0/8
+ if _, net, err := net.ParseCIDR(host); err == nil {
+ p.AddNetwork(net)
+ }
+ continue
+ }
+ if ip := net.ParseIP(host); ip != nil {
+ p.AddIP(ip)
+ continue
+ }
+ if strings.HasPrefix(host, "*.") {
+ p.AddZone(host[1:])
+ continue
+ }
+ p.AddHost(host)
+ }
+}
+
+// AddIP specifies an IP address that will use the bypass proxy. Note that
+// this will only take effect if a literal IP address is dialed. A connection
+// to a named host will never match an IP.
+func (p *proxy_PerHost) AddIP(ip net.IP) {
+ p.bypassIPs = append(p.bypassIPs, ip)
+}
+
+// AddNetwork specifies an IP range that will use the bypass proxy. Note that
+// this will only take effect if a literal IP address is dialed. A connection
+// to a named host will never match.
+func (p *proxy_PerHost) AddNetwork(net *net.IPNet) {
+ p.bypassNetworks = append(p.bypassNetworks, net)
+}
+
+// AddZone specifies a DNS suffix that will use the bypass proxy. A zone of
+// "example.com" matches "example.com" and all of its subdomains.
+func (p *proxy_PerHost) AddZone(zone string) {
+ if strings.HasSuffix(zone, ".") {
+ zone = zone[:len(zone)-1]
+ }
+ if !strings.HasPrefix(zone, ".") {
+ zone = "." + zone
+ }
+ p.bypassZones = append(p.bypassZones, zone)
+}
+
+// AddHost specifies a host name that will use the bypass proxy.
+func (p *proxy_PerHost) AddHost(host string) {
+ if strings.HasSuffix(host, ".") {
+ host = host[:len(host)-1]
+ }
+ p.bypassHosts = append(p.bypassHosts, host)
+}
+
+// A Dialer is a means to establish a connection.
+type proxy_Dialer interface {
+ // Dial connects to the given address via the proxy.
+ Dial(network, addr string) (c net.Conn, err error)
+}
+
+// Auth contains authentication parameters that specific Dialers may require.
+type proxy_Auth struct {
+ User, Password string
+}
+
+// FromEnvironment returns the dialer specified by the proxy related variables in
+// the environment.
+func proxy_FromEnvironment() proxy_Dialer {
+ allProxy := proxy_allProxyEnv.Get()
+ if len(allProxy) == 0 {
+ return proxy_Direct
+ }
+
+ proxyURL, err := url.Parse(allProxy)
+ if err != nil {
+ return proxy_Direct
+ }
+ proxy, err := proxy_FromURL(proxyURL, proxy_Direct)
+ if err != nil {
+ return proxy_Direct
+ }
+
+ noProxy := proxy_noProxyEnv.Get()
+ if len(noProxy) == 0 {
+ return proxy
+ }
+
+ perHost := proxy_NewPerHost(proxy, proxy_Direct)
+ perHost.AddFromString(noProxy)
+ return perHost
+}
+
+// proxySchemes is a map from URL schemes to a function that creates a Dialer
+// from a URL with such a scheme.
+var proxy_proxySchemes map[string]func(*url.URL, proxy_Dialer) (proxy_Dialer, error)
+
+// RegisterDialerType takes a URL scheme and a function to generate Dialers from
+// a URL with that scheme and a forwarding Dialer. Registered schemes are used
+// by FromURL.
+func proxy_RegisterDialerType(scheme string, f func(*url.URL, proxy_Dialer) (proxy_Dialer, error)) {
+ if proxy_proxySchemes == nil {
+ proxy_proxySchemes = make(map[string]func(*url.URL, proxy_Dialer) (proxy_Dialer, error))
+ }
+ proxy_proxySchemes[scheme] = f
+}
+
+// FromURL returns a Dialer given a URL specification and an underlying
+// Dialer for it to make network requests.
+func proxy_FromURL(u *url.URL, forward proxy_Dialer) (proxy_Dialer, error) {
+ var auth *proxy_Auth
+ if u.User != nil {
+ auth = new(proxy_Auth)
+ auth.User = u.User.Username()
+ if p, ok := u.User.Password(); ok {
+ auth.Password = p
+ }
+ }
+
+ switch u.Scheme {
+ case "socks5":
+ return proxy_SOCKS5("tcp", u.Host, auth, forward)
+ }
+
+ // If the scheme doesn't match any of the built-in schemes, see if it
+ // was registered by another package.
+ if proxy_proxySchemes != nil {
+ if f, ok := proxy_proxySchemes[u.Scheme]; ok {
+ return f(u, forward)
+ }
+ }
+
+ return nil, errors.New("proxy: unknown scheme: " + u.Scheme)
+}
+
+var (
+ proxy_allProxyEnv = &proxy_envOnce{
+ names: []string{"ALL_PROXY", "all_proxy"},
+ }
+ proxy_noProxyEnv = &proxy_envOnce{
+ names: []string{"NO_PROXY", "no_proxy"},
+ }
+)
+
+// envOnce looks up an environment variable (optionally by multiple
+// names) once. It mitigates expensive lookups on some platforms
+// (e.g. Windows).
+// (Borrowed from net/http/transport.go)
+type proxy_envOnce struct {
+ names []string
+ once sync.Once
+ val string
+}
+
+func (e *proxy_envOnce) Get() string {
+ e.once.Do(e.init)
+ return e.val
+}
+
+func (e *proxy_envOnce) init() {
+ for _, n := range e.names {
+ e.val = os.Getenv(n)
+ if e.val != "" {
+ return
+ }
+ }
+}
+
+// SOCKS5 returns a Dialer that makes SOCKSv5 connections to the given address
+// with an optional username and password. See RFC 1928 and RFC 1929.
+func proxy_SOCKS5(network, addr string, auth *proxy_Auth, forward proxy_Dialer) (proxy_Dialer, error) {
+ s := &proxy_socks5{
+ network: network,
+ addr: addr,
+ forward: forward,
+ }
+ if auth != nil {
+ s.user = auth.User
+ s.password = auth.Password
+ }
+
+ return s, nil
+}
+
+type proxy_socks5 struct {
+ user, password string
+ network, addr string
+ forward proxy_Dialer
+}
+
+const proxy_socks5Version = 5
+
+const (
+ proxy_socks5AuthNone = 0
+ proxy_socks5AuthPassword = 2
+)
+
+const proxy_socks5Connect = 1
+
+const (
+ proxy_socks5IP4 = 1
+ proxy_socks5Domain = 3
+ proxy_socks5IP6 = 4
+)
+
+var proxy_socks5Errors = []string{
+ "",
+ "general failure",
+ "connection forbidden",
+ "network unreachable",
+ "host unreachable",
+ "connection refused",
+ "TTL expired",
+ "command not supported",
+ "address type not supported",
+}
+
+// Dial connects to the address addr on the given network via the SOCKS5 proxy.
+func (s *proxy_socks5) Dial(network, addr string) (net.Conn, error) {
+ switch network {
+ case "tcp", "tcp6", "tcp4":
+ default:
+ return nil, errors.New("proxy: no support for SOCKS5 proxy connections of type " + network)
+ }
+
+ conn, err := s.forward.Dial(s.network, s.addr)
+ if err != nil {
+ return nil, err
+ }
+ if err := s.connect(conn, addr); err != nil {
+ conn.Close()
+ return nil, err
+ }
+ return conn, nil
+}
+
+// connect takes an existing connection to a socks5 proxy server,
+// and commands the server to extend that connection to target,
+// which must be a canonical address with a host and port.
+func (s *proxy_socks5) connect(conn net.Conn, target string) error {
+ host, portStr, err := net.SplitHostPort(target)
+ if err != nil {
+ return err
+ }
+
+ port, err := strconv.Atoi(portStr)
+ if err != nil {
+ return errors.New("proxy: failed to parse port number: " + portStr)
+ }
+ if port < 1 || port > 0xffff {
+ return errors.New("proxy: port number out of range: " + portStr)
+ }
+
+ // the size here is just an estimate
+ buf := make([]byte, 0, 6+len(host))
+
+ buf = append(buf, proxy_socks5Version)
+ if len(s.user) > 0 && len(s.user) < 256 && len(s.password) < 256 {
+ buf = append(buf, 2 /* num auth methods */, proxy_socks5AuthNone, proxy_socks5AuthPassword)
+ } else {
+ buf = append(buf, 1 /* num auth methods */, proxy_socks5AuthNone)
+ }
+
+ if _, err := conn.Write(buf); err != nil {
+ return errors.New("proxy: failed to write greeting to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+
+ if _, err := io.ReadFull(conn, buf[:2]); err != nil {
+ return errors.New("proxy: failed to read greeting from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+ if buf[0] != 5 {
+ return errors.New("proxy: SOCKS5 proxy at " + s.addr + " has unexpected version " + strconv.Itoa(int(buf[0])))
+ }
+ if buf[1] == 0xff {
+ return errors.New("proxy: SOCKS5 proxy at " + s.addr + " requires authentication")
+ }
+
+ // See RFC 1929
+ if buf[1] == proxy_socks5AuthPassword {
+ buf = buf[:0]
+ buf = append(buf, 1 /* password protocol version */)
+ buf = append(buf, uint8(len(s.user)))
+ buf = append(buf, s.user...)
+ buf = append(buf, uint8(len(s.password)))
+ buf = append(buf, s.password...)
+
+ if _, err := conn.Write(buf); err != nil {
+ return errors.New("proxy: failed to write authentication request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+
+ if _, err := io.ReadFull(conn, buf[:2]); err != nil {
+ return errors.New("proxy: failed to read authentication reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+
+ if buf[1] != 0 {
+ return errors.New("proxy: SOCKS5 proxy at " + s.addr + " rejected username/password")
+ }
+ }
+
+ buf = buf[:0]
+ buf = append(buf, proxy_socks5Version, proxy_socks5Connect, 0 /* reserved */)
+
+ if ip := net.ParseIP(host); ip != nil {
+ if ip4 := ip.To4(); ip4 != nil {
+ buf = append(buf, proxy_socks5IP4)
+ ip = ip4
+ } else {
+ buf = append(buf, proxy_socks5IP6)
+ }
+ buf = append(buf, ip...)
+ } else {
+ if len(host) > 255 {
+ return errors.New("proxy: destination host name too long: " + host)
+ }
+ buf = append(buf, proxy_socks5Domain)
+ buf = append(buf, byte(len(host)))
+ buf = append(buf, host...)
+ }
+ buf = append(buf, byte(port>>8), byte(port))
+
+ if _, err := conn.Write(buf); err != nil {
+ return errors.New("proxy: failed to write connect request to SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+
+ if _, err := io.ReadFull(conn, buf[:4]); err != nil {
+ return errors.New("proxy: failed to read connect reply from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+
+ failure := "unknown error"
+ if int(buf[1]) < len(proxy_socks5Errors) {
+ failure = proxy_socks5Errors[buf[1]]
+ }
+
+ if len(failure) > 0 {
+ return errors.New("proxy: SOCKS5 proxy at " + s.addr + " failed to connect: " + failure)
+ }
+
+ bytesToDiscard := 0
+ switch buf[3] {
+ case proxy_socks5IP4:
+ bytesToDiscard = net.IPv4len
+ case proxy_socks5IP6:
+ bytesToDiscard = net.IPv6len
+ case proxy_socks5Domain:
+ _, err := io.ReadFull(conn, buf[:1])
+ if err != nil {
+ return errors.New("proxy: failed to read domain length from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+ bytesToDiscard = int(buf[0])
+ default:
+ return errors.New("proxy: got unknown address type " + strconv.Itoa(int(buf[3])) + " from SOCKS5 proxy at " + s.addr)
+ }
+
+ if cap(buf) < bytesToDiscard {
+ buf = make([]byte, bytesToDiscard)
+ } else {
+ buf = buf[:bytesToDiscard]
+ }
+ if _, err := io.ReadFull(conn, buf); err != nil {
+ return errors.New("proxy: failed to read address from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+
+ // Also need to discard the port number
+ if _, err := io.ReadFull(conn, buf[:2]); err != nil {
+ return errors.New("proxy: failed to read port from SOCKS5 proxy at " + s.addr + ": " + err.Error())
+ }
+
+ return nil
+}
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