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90 lines
3.2 KiB
Go
90 lines
3.2 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 meeklite provides an implementation of the Meek circumvention
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// protocol. Only a client implementation is provided, and no effort is
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// made to normalize the TLS fingerprint.
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//
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// It borrows quite liberally from the real meek-client code.
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package meeklite // import "gitlab.com/yawning/obfs4.git/transports/meeklite"
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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 = "meek_lite"
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// Transport is the Meek implementation of the base.Transport interface.
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type Transport struct{}
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// Name returns the name of the Meek 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 meekClientFactory instance.
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func (t *Transport) ClientFactory(stateDir string) (base.ClientFactory, error) {
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cf := &meekClientFactory{transport: t}
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return cf, nil
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}
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// ServerFactory will one day return a new meekServerFactory 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 for servers people should
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// just use the real thing.
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return nil, fmt.Errorf("server not supported")
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}
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type meekClientFactory struct {
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transport base.Transport
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}
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func (cf *meekClientFactory) Transport() base.Transport {
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return cf.transport
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}
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func (cf *meekClientFactory) ParseArgs(args *pt.Args) (interface{}, error) {
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return newClientArgs(args)
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}
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func (cf *meekClientFactory) 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.(*meekClientArgs)
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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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return newMeekConn(network, addr, dialFn, ca)
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}
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var _ base.ClientFactory = (*meekClientFactory)(nil)
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var _ base.Transport = (*Transport)(nil)
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