Split "proxies" into "proxy_dialers" and "modes"

Half of the packages in there registered dialer types with golang.org/x/net/proxy,
and half of them were proxying modes for the program as a whole.  These are separate
things, so move them into separate directories.

1 files changed, 0 insertions, 164 deletions

diff --git a/proxies/proxy_socks4/proxy_socks4.go b/proxies/proxy_socks4/proxy_socks4.go
deleted file mode 100644
index 4e67f46..0000000
--- a/proxies/proxy_socks4/proxy_socks4.go
+++ /dev/null
@@ -1,164 +0,0 @@
-/*
- * Copyright (c) 2014, Yawning Angel <yawning at torproject dot org>
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- *  * Redistributions of source code must retain the above copyright notice,
- *    this list of conditions and the following disclaimer.
- *
- *  * Redistributions in binary form must reproduce the above copyright notice,
- *    this list of conditions and the following disclaimer in the documentation
- *    and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
- * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
- * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
- * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
- * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
- * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
- * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
- * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- * This is inspired by go.net/proxy/socks5.go:
- *
- * Copyright 2011 The Go Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style
- * license that can be found in the LICENSE file.
- */
-
-package proxy_socks4
-
-import (
-	"errors"
-	"fmt"
-	"io"
-	"net"
-	"net/url"
-	"strconv"
-
-	"golang.org/x/net/proxy"
-)
-
-// socks4Proxy is a SOCKS4 proxy.
-type socks4Proxy struct {
-	hostPort string
-	username string
-	forward  proxy.Dialer
-}
-
-const (
-	socks4Version        = 0x04
-	socks4CommandConnect = 0x01
-	socks4Null           = 0x00
-	socks4ReplyVersion   = 0x00
-
-	socks4Granted                = 0x5a
-	socks4Rejected               = 0x5b
-	socks4RejectedIdentdFailed   = 0x5c
-	socks4RejectedIdentdMismatch = 0x5d
-)
-
-func newSOCKS4(uri *url.URL, forward proxy.Dialer) (proxy.Dialer, error) {
-	s := new(socks4Proxy)
-	s.hostPort = uri.Host
-	s.forward = forward
-	if uri.User != nil {
-		s.username = uri.User.Username()
-	}
-	return s, nil
-}
-
-func (s *socks4Proxy) Dial(network, addr string) (net.Conn, error) {
-	if network != "tcp" && network != "tcp4" {
-		return nil, errors.New("invalid network type")
-	}
-
-	// Deal with the destination address/string.
-	ipStr, portStr, err := net.SplitHostPort(addr)
-	if err != nil {
-		return nil, err
-	}
-	ip := net.ParseIP(ipStr)
-	if ip == nil {
-		return nil, errors.New("failed to parse destination IP")
-	}
-	ip4 := ip.To4()
-	if ip4 == nil {
-		return nil, errors.New("destination address is not IPv4")
-	}
-	port, err := strconv.ParseUint(portStr, 10, 16)
-	if err != nil {
-		return nil, err
-	}
-
-	// Connect to the proxy.
-	c, err := s.forward.Dial("tcp", s.hostPort)
-	if err != nil {
-		return nil, err
-	}
-
-	// Make/write the request:
-	//  +----+----+----+----+----+----+----+----+----+----+....+----+
-	//  | VN | CD | DSTPORT |      DSTIP        | USERID       |NULL|
-	//  +----+----+----+----+----+----+----+----+----+----+....+----+
-
-	req := make([]byte, 0, 9+len(s.username))
-	req = append(req, socks4Version)
-	req = append(req, socks4CommandConnect)
-	req = append(req, byte(port>>8), byte(port))
-	req = append(req, ip4...)
-	if s.username != "" {
-		req = append(req, s.username...)
-	}
-	req = append(req, socks4Null)
-	_, err = c.Write(req)
-	if err != nil {
-		c.Close()
-		return nil, err
-	}
-
-	// Read the response:
-	// +----+----+----+----+----+----+----+----+
-	// | VN | CD | DSTPORT |      DSTIP        |
-	// +----+----+----+----+----+----+----+----+
-
-	var resp [8]byte
-	_, err = io.ReadFull(c, resp[:])
-	if err != nil {
-		c.Close()
-		return nil, err
-	}
-	if resp[0] != socks4ReplyVersion {
-		c.Close()
-		return nil, errors.New("proxy returned invalid SOCKS4 version")
-	}
-	if resp[1] != socks4Granted {
-		c.Close()
-		return nil, fmt.Errorf("proxy error: %s", socks4ErrorToString(resp[1]))
-	}
-
-	return c, nil
-}
-
-func socks4ErrorToString(code byte) string {
-	switch code {
-	case socks4Rejected:
-		return "request rejected or failed"
-	case socks4RejectedIdentdFailed:
-		return "request rejected becasue SOCKS server cannot connect to identd on the client"
-	case socks4RejectedIdentdMismatch:
-		return "request rejected because the client program and identd report different user-ids"
-	default:
-		return fmt.Sprintf("unknown failure code %x", code)
-	}
-}
-
-func init() {
-	// Despite the scheme name, this really is SOCKS4.
-	proxy.RegisterDialerType("socks4a", newSOCKS4)
-}