Naive implementation that always return min value
This commit is contained in:
168
vendor/golang.org/x/net/internal/socks/client.go
generated
vendored
Normal file
168
vendor/golang.org/x/net/internal/socks/client.go
generated
vendored
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@@ -0,0 +1,168 @@
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package socks
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import (
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"context"
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"errors"
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"io"
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"net"
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"strconv"
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"time"
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)
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var (
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noDeadline = time.Time{}
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aLongTimeAgo = time.Unix(1, 0)
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)
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func (d *Dialer) connect(ctx context.Context, c net.Conn, address string) (_ net.Addr, ctxErr error) {
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host, port, err := splitHostPort(address)
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if err != nil {
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return nil, err
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}
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if deadline, ok := ctx.Deadline(); ok && !deadline.IsZero() {
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c.SetDeadline(deadline)
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defer c.SetDeadline(noDeadline)
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}
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if ctx != context.Background() {
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errCh := make(chan error, 1)
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done := make(chan struct{})
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defer func() {
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close(done)
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if ctxErr == nil {
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ctxErr = <-errCh
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}
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}()
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go func() {
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select {
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case <-ctx.Done():
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c.SetDeadline(aLongTimeAgo)
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errCh <- ctx.Err()
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case <-done:
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errCh <- nil
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}
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}()
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}
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b := make([]byte, 0, 6+len(host)) // the size here is just an estimate
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b = append(b, Version5)
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if len(d.AuthMethods) == 0 || d.Authenticate == nil {
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b = append(b, 1, byte(AuthMethodNotRequired))
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} else {
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ams := d.AuthMethods
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if len(ams) > 255 {
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return nil, errors.New("too many authentication methods")
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}
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b = append(b, byte(len(ams)))
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for _, am := range ams {
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b = append(b, byte(am))
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}
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}
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if _, ctxErr = c.Write(b); ctxErr != nil {
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return
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}
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if _, ctxErr = io.ReadFull(c, b[:2]); ctxErr != nil {
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return
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}
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if b[0] != Version5 {
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return nil, errors.New("unexpected protocol version " + strconv.Itoa(int(b[0])))
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}
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am := AuthMethod(b[1])
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if am == AuthMethodNoAcceptableMethods {
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return nil, errors.New("no acceptable authentication methods")
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}
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if d.Authenticate != nil {
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if ctxErr = d.Authenticate(ctx, c, am); ctxErr != nil {
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return
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}
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}
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b = b[:0]
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b = append(b, Version5, byte(d.cmd), 0)
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if ip := net.ParseIP(host); ip != nil {
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if ip4 := ip.To4(); ip4 != nil {
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b = append(b, AddrTypeIPv4)
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b = append(b, ip4...)
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} else if ip6 := ip.To16(); ip6 != nil {
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b = append(b, AddrTypeIPv6)
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b = append(b, ip6...)
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} else {
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return nil, errors.New("unknown address type")
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}
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} else {
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if len(host) > 255 {
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return nil, errors.New("FQDN too long")
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}
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b = append(b, AddrTypeFQDN)
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b = append(b, byte(len(host)))
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b = append(b, host...)
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}
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b = append(b, byte(port>>8), byte(port))
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if _, ctxErr = c.Write(b); ctxErr != nil {
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return
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}
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if _, ctxErr = io.ReadFull(c, b[:4]); ctxErr != nil {
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return
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}
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if b[0] != Version5 {
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return nil, errors.New("unexpected protocol version " + strconv.Itoa(int(b[0])))
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}
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if cmdErr := Reply(b[1]); cmdErr != StatusSucceeded {
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return nil, errors.New("unknown error " + cmdErr.String())
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}
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if b[2] != 0 {
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return nil, errors.New("non-zero reserved field")
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}
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l := 2
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var a Addr
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switch b[3] {
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case AddrTypeIPv4:
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l += net.IPv4len
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a.IP = make(net.IP, net.IPv4len)
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case AddrTypeIPv6:
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l += net.IPv6len
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a.IP = make(net.IP, net.IPv6len)
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case AddrTypeFQDN:
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if _, err := io.ReadFull(c, b[:1]); err != nil {
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return nil, err
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}
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l += int(b[0])
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default:
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return nil, errors.New("unknown address type " + strconv.Itoa(int(b[3])))
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}
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if cap(b) < l {
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b = make([]byte, l)
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} else {
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b = b[:l]
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}
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if _, ctxErr = io.ReadFull(c, b); ctxErr != nil {
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return
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}
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if a.IP != nil {
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copy(a.IP, b)
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} else {
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a.Name = string(b[:len(b)-2])
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}
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a.Port = int(b[len(b)-2])<<8 | int(b[len(b)-1])
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return &a, nil
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}
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func splitHostPort(address string) (string, int, error) {
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host, port, err := net.SplitHostPort(address)
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if err != nil {
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return "", 0, err
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}
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portnum, err := strconv.Atoi(port)
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if err != nil {
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return "", 0, err
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}
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if 1 > portnum || portnum > 0xffff {
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return "", 0, errors.New("port number out of range " + port)
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}
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return host, portnum, nil
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}
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317
vendor/golang.org/x/net/internal/socks/socks.go
generated
vendored
Normal file
317
vendor/golang.org/x/net/internal/socks/socks.go
generated
vendored
Normal file
@@ -0,0 +1,317 @@
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// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package socks provides a SOCKS version 5 client implementation.
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//
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// SOCKS protocol version 5 is defined in RFC 1928.
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// Username/Password authentication for SOCKS version 5 is defined in
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// RFC 1929.
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package socks
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import (
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"context"
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"errors"
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"io"
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"net"
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"strconv"
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)
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// A Command represents a SOCKS command.
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type Command int
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func (cmd Command) String() string {
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switch cmd {
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case CmdConnect:
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return "socks connect"
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case cmdBind:
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return "socks bind"
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default:
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return "socks " + strconv.Itoa(int(cmd))
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}
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}
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// An AuthMethod represents a SOCKS authentication method.
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type AuthMethod int
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// A Reply represents a SOCKS command reply code.
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type Reply int
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func (code Reply) String() string {
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switch code {
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case StatusSucceeded:
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return "succeeded"
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case 0x01:
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return "general SOCKS server failure"
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case 0x02:
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return "connection not allowed by ruleset"
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case 0x03:
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return "network unreachable"
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case 0x04:
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return "host unreachable"
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case 0x05:
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return "connection refused"
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case 0x06:
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return "TTL expired"
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case 0x07:
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return "command not supported"
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case 0x08:
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return "address type not supported"
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default:
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return "unknown code: " + strconv.Itoa(int(code))
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}
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}
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// Wire protocol constants.
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const (
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Version5 = 0x05
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AddrTypeIPv4 = 0x01
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AddrTypeFQDN = 0x03
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AddrTypeIPv6 = 0x04
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CmdConnect Command = 0x01 // establishes an active-open forward proxy connection
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cmdBind Command = 0x02 // establishes a passive-open forward proxy connection
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AuthMethodNotRequired AuthMethod = 0x00 // no authentication required
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AuthMethodUsernamePassword AuthMethod = 0x02 // use username/password
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AuthMethodNoAcceptableMethods AuthMethod = 0xff // no acceptable authentication methods
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StatusSucceeded Reply = 0x00
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)
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// An Addr represents a SOCKS-specific address.
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// Either Name or IP is used exclusively.
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type Addr struct {
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Name string // fully-qualified domain name
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IP net.IP
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Port int
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}
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func (a *Addr) Network() string { return "socks" }
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func (a *Addr) String() string {
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if a == nil {
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return "<nil>"
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}
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port := strconv.Itoa(a.Port)
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if a.IP == nil {
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return net.JoinHostPort(a.Name, port)
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}
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return net.JoinHostPort(a.IP.String(), port)
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}
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// A Conn represents a forward proxy connection.
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type Conn struct {
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net.Conn
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boundAddr net.Addr
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}
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// BoundAddr returns the address assigned by the proxy server for
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// connecting to the command target address from the proxy server.
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func (c *Conn) BoundAddr() net.Addr {
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if c == nil {
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return nil
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}
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return c.boundAddr
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}
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// A Dialer holds SOCKS-specific options.
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type Dialer struct {
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cmd Command // either CmdConnect or cmdBind
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proxyNetwork string // network between a proxy server and a client
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proxyAddress string // proxy server address
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// ProxyDial specifies the optional dial function for
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// establishing the transport connection.
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ProxyDial func(context.Context, string, string) (net.Conn, error)
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// AuthMethods specifies the list of request authentication
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// methods.
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// If empty, SOCKS client requests only AuthMethodNotRequired.
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AuthMethods []AuthMethod
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// Authenticate specifies the optional authentication
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// function. It must be non-nil when AuthMethods is not empty.
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// It must return an error when the authentication is failed.
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Authenticate func(context.Context, io.ReadWriter, AuthMethod) error
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}
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// DialContext connects to the provided address on the provided
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// network.
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//
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// The returned error value may be a net.OpError. When the Op field of
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// net.OpError contains "socks", the Source field contains a proxy
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// server address and the Addr field contains a command target
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// address.
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//
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// See func Dial of the net package of standard library for a
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// description of the network and address parameters.
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func (d *Dialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
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if err := d.validateTarget(network, address); err != nil {
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proxy, dst, _ := d.pathAddrs(address)
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return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
|
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}
|
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if ctx == nil {
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proxy, dst, _ := d.pathAddrs(address)
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return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: errors.New("nil context")}
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}
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var err error
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var c net.Conn
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if d.ProxyDial != nil {
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c, err = d.ProxyDial(ctx, d.proxyNetwork, d.proxyAddress)
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} else {
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var dd net.Dialer
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c, err = dd.DialContext(ctx, d.proxyNetwork, d.proxyAddress)
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}
|
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if err != nil {
|
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proxy, dst, _ := d.pathAddrs(address)
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return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
|
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}
|
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a, err := d.connect(ctx, c, address)
|
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if err != nil {
|
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c.Close()
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proxy, dst, _ := d.pathAddrs(address)
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return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
|
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}
|
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return &Conn{Conn: c, boundAddr: a}, nil
|
||||
}
|
||||
|
||||
// DialWithConn initiates a connection from SOCKS server to the target
|
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// network and address using the connection c that is already
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// connected to the SOCKS server.
|
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//
|
||||
// It returns the connection's local address assigned by the SOCKS
|
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// server.
|
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func (d *Dialer) DialWithConn(ctx context.Context, c net.Conn, network, address string) (net.Addr, error) {
|
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if err := d.validateTarget(network, address); err != nil {
|
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proxy, dst, _ := d.pathAddrs(address)
|
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return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
|
||||
}
|
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if ctx == nil {
|
||||
proxy, dst, _ := d.pathAddrs(address)
|
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return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: errors.New("nil context")}
|
||||
}
|
||||
a, err := d.connect(ctx, c, address)
|
||||
if err != nil {
|
||||
proxy, dst, _ := d.pathAddrs(address)
|
||||
return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
|
||||
}
|
||||
return a, nil
|
||||
}
|
||||
|
||||
// Dial connects to the provided address on the provided network.
|
||||
//
|
||||
// Unlike DialContext, it returns a raw transport connection instead
|
||||
// of a forward proxy connection.
|
||||
//
|
||||
// Deprecated: Use DialContext or DialWithConn instead.
|
||||
func (d *Dialer) Dial(network, address string) (net.Conn, error) {
|
||||
if err := d.validateTarget(network, address); err != nil {
|
||||
proxy, dst, _ := d.pathAddrs(address)
|
||||
return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
|
||||
}
|
||||
var err error
|
||||
var c net.Conn
|
||||
if d.ProxyDial != nil {
|
||||
c, err = d.ProxyDial(context.Background(), d.proxyNetwork, d.proxyAddress)
|
||||
} else {
|
||||
c, err = net.Dial(d.proxyNetwork, d.proxyAddress)
|
||||
}
|
||||
if err != nil {
|
||||
proxy, dst, _ := d.pathAddrs(address)
|
||||
return nil, &net.OpError{Op: d.cmd.String(), Net: network, Source: proxy, Addr: dst, Err: err}
|
||||
}
|
||||
if _, err := d.DialWithConn(context.Background(), c, network, address); err != nil {
|
||||
c.Close()
|
||||
return nil, err
|
||||
}
|
||||
return c, nil
|
||||
}
|
||||
|
||||
func (d *Dialer) validateTarget(network, address string) error {
|
||||
switch network {
|
||||
case "tcp", "tcp6", "tcp4":
|
||||
default:
|
||||
return errors.New("network not implemented")
|
||||
}
|
||||
switch d.cmd {
|
||||
case CmdConnect, cmdBind:
|
||||
default:
|
||||
return errors.New("command not implemented")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
|
||||
func (d *Dialer) pathAddrs(address string) (proxy, dst net.Addr, err error) {
|
||||
for i, s := range []string{d.proxyAddress, address} {
|
||||
host, port, err := splitHostPort(s)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
a := &Addr{Port: port}
|
||||
a.IP = net.ParseIP(host)
|
||||
if a.IP == nil {
|
||||
a.Name = host
|
||||
}
|
||||
if i == 0 {
|
||||
proxy = a
|
||||
} else {
|
||||
dst = a
|
||||
}
|
||||
}
|
||||
return
|
||||
}
|
||||
|
||||
// NewDialer returns a new Dialer that dials through the provided
|
||||
// proxy server's network and address.
|
||||
func NewDialer(network, address string) *Dialer {
|
||||
return &Dialer{proxyNetwork: network, proxyAddress: address, cmd: CmdConnect}
|
||||
}
|
||||
|
||||
const (
|
||||
authUsernamePasswordVersion = 0x01
|
||||
authStatusSucceeded = 0x00
|
||||
)
|
||||
|
||||
// UsernamePassword are the credentials for the username/password
|
||||
// authentication method.
|
||||
type UsernamePassword struct {
|
||||
Username string
|
||||
Password string
|
||||
}
|
||||
|
||||
// Authenticate authenticates a pair of username and password with the
|
||||
// proxy server.
|
||||
func (up *UsernamePassword) Authenticate(ctx context.Context, rw io.ReadWriter, auth AuthMethod) error {
|
||||
switch auth {
|
||||
case AuthMethodNotRequired:
|
||||
return nil
|
||||
case AuthMethodUsernamePassword:
|
||||
if len(up.Username) == 0 || len(up.Username) > 255 || len(up.Password) == 0 || len(up.Password) > 255 {
|
||||
return errors.New("invalid username/password")
|
||||
}
|
||||
b := []byte{authUsernamePasswordVersion}
|
||||
b = append(b, byte(len(up.Username)))
|
||||
b = append(b, up.Username...)
|
||||
b = append(b, byte(len(up.Password)))
|
||||
b = append(b, up.Password...)
|
||||
// TODO(mikio): handle IO deadlines and cancelation if
|
||||
// necessary
|
||||
if _, err := rw.Write(b); err != nil {
|
||||
return err
|
||||
}
|
||||
if _, err := io.ReadFull(rw, b[:2]); err != nil {
|
||||
return err
|
||||
}
|
||||
if b[0] != authUsernamePasswordVersion {
|
||||
return errors.New("invalid username/password version")
|
||||
}
|
||||
if b[1] != authStatusSucceeded {
|
||||
return errors.New("username/password authentication failed")
|
||||
}
|
||||
return nil
|
||||
}
|
||||
return errors.New("unsupported authentication method " + strconv.Itoa(int(auth)))
|
||||
}
|
||||
Reference in New Issue
Block a user