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100 lines
3.4 KiB
Go
100 lines
3.4 KiB
Go
/*
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* Copyright (c) 2015, Yawning Angel <yawning at schwanenlied dot me>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* * Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* * Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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// Package scramblesuit provides an implementation of the ScrambleSuit
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// obfuscation protocol. The implementation is client only.
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package scramblesuit // import "gitlab.com/yawning/obfs4.git/transports/scramblesuit"
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import (
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"fmt"
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"net"
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"git.torproject.org/pluggable-transports/goptlib.git"
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"gitlab.com/yawning/obfs4.git/transports/base"
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)
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const transportName = "scramblesuit"
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// Transport is the ScrambleSuit implementation of the base.Transport interface.
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type Transport struct{}
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// Name returns the name of the ScrambleSuit transport protocol.
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func (t *Transport) Name() string {
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return transportName
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}
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// ClientFactory returns a new ssClientFactory instance.
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func (t *Transport) ClientFactory(stateDir string) (base.ClientFactory, error) {
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tStore, err := loadTicketStore(stateDir)
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if err != nil {
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return nil, err
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}
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cf := &ssClientFactory{transport: t, ticketStore: tStore}
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return cf, nil
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}
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// ServerFactory will one day return a new ssServerFactory instance.
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func (t *Transport) ServerFactory(stateDir string, args *pt.Args) (base.ServerFactory, error) {
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// TODO: Fill this in eventually, though obfs4 is better.
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return nil, fmt.Errorf("server not supported")
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}
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type ssClientFactory struct {
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transport base.Transport
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ticketStore *ssTicketStore
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}
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func (cf *ssClientFactory) Transport() base.Transport {
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return cf.transport
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}
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func (cf *ssClientFactory) ParseArgs(args *pt.Args) (interface{}, error) {
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return newClientArgs(args)
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}
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func (cf *ssClientFactory) Dial(network, addr string, dialFn base.DialFunc, args interface{}) (net.Conn, error) {
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// Validate args before opening outgoing connection.
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ca, ok := args.(*ssClientArgs)
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if !ok {
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return nil, fmt.Errorf("invalid argument type for args")
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}
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conn, err := dialFn(network, addr)
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if err != nil {
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return nil, err
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}
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dialConn := conn
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if conn, err = newScrambleSuitClientConn(conn, cf.ticketStore, ca); err != nil {
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dialConn.Close()
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return nil, err
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}
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return conn, nil
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}
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var _ base.ClientFactory = (*ssClientFactory)(nil)
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var _ base.Transport = (*Transport)(nil)
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