reference basis

.travis.yml

+os:
+  - linux
+
+language: go
+
+go:
+  - 1.13.x
+
+env:
+  global:
+    - GOTFLAGS="-race"
+  matrix:
+    - BUILD_DEPTYPE=gomod
+
+
+# disable travis install
+install:
+  - true
+
+script:
+  - bash <(curl -s https://raw.githubusercontent.com/ipfs/ci-helpers/master/travis-ci/run-standard-tests.sh)
+
+
+cache:
+  directories:
+    - $GOPATH/pkg/mod
+    - $HOME/.cache/go-build
+
+notifications:
+  email: false

LICENSE

+The MIT License (MIT)
+
+Copyright (c) 2018 Protocol Labs
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

README.md

 # go-conn-security-multistream
 
-dms3 p2p go-conn-security-multistream
\ No newline at end of file
+[![](https://img.shields.io/badge/made%20by-Protocol%20Labs-blue.svg?style=flat-square)](https://protocol.ai)
+[![](https://img.shields.io/badge/project-libp2p-yellow.svg?style=flat-square)](https://libp2p.io/)
+[![](https://img.shields.io/badge/freenode-%23libp2p-yellow.svg?style=flat-square)](http://webchat.freenode.net/?channels=%23libp2p)
+[![Discourse posts](https://img.shields.io/discourse/https/discuss.libp2p.io/posts.svg)](https://discuss.libp2p.io)
+[![GoDoc](https://godoc.org/github.com/libp2p/go-conn-security-multistream?status.svg)](https://godoc.org/github.com/libp2p/go-conn-security-multistream)
+
+> Connection security multistream multiplexer
+
+This package provides a multistream multiplexed [security transport](https://github.com/libp2p/go-conn-security). It:
+
+1. Selects a security transport using multistream-select.
+2. Secures the stream using the selected transport.
+
+Known libp2p security transports include:
+
+* [go-libp2p-secio](https://github.com/libp2p/go-libp2p-secio)
+* [go-libp2p-tls](https://github.com/libp2p/go-libp2p-tls)
+
+## Install
+
+`go-conn-security-multistream` is a standard Go module which can be installed with:
+
+```sh
+go get github.com/libp2p/go-conn-security-multistream
+```
+
+This repo is [gomod](https://github.com/golang/go/wiki/Modules)-compatible, and users of
+go 1.11 and later with modules enabled will automatically pull the latest tagged release
+by referencing this package. Upgrades to future releases can be managed using `go get`,
+or by editing your `go.mod` file as [described by the gomod documentation](https://github.com/golang/go/wiki/Modules#how-to-upgrade-and-downgrade-dependencies).
+
+## Usage
+
+For more information about how `go-conn-security-multistream` is used in the libp2p context, you can see the [go-libp2p-conn](https://github.com/libp2p/go-libp2p-conn) module.
+
+## Contribute
+
+Feel free to join in. All welcome. Open an [issue](https://github.com/libp2p/go-conn-security-multistream/issues)!
+
+This repository falls under the libp2p [Code of Conduct](https://github.com/libp2p/community/blob/master/code-of-conduct.md).
+
+### Want to hack on libp2p?
+
+[![](https://cdn.rawgit.com/libp2p/community/master/img/contribute.gif)](https://github.com/libp2p/community/blob/master/CONTRIBUTE.md)
+
+## License
+
+MIT
+
+---
+
+The last gx published version of this module was: 0.1.26: QmZWmFkMm28sWeDr5Xh1LexdKBGYGp946MNCfgtLqfX73z

go.mod

+module github.com/libp2p/go-conn-security-multistream
+
+go 1.12
+
+require (
+	github.com/libp2p/go-libp2p-core v0.8.1
+	github.com/libp2p/go-libp2p-testing v0.3.0
+	github.com/multiformats/go-multistream v0.2.1
+)

go.sum

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ssms.go

+package csms
+
+import (
+	"context"
+	"fmt"
+	"net"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+	"github.com/libp2p/go-libp2p-core/sec"
+	mss "github.com/multiformats/go-multistream"
+)
+
+// SSMuxer is a multistream stream security transport multiplexer.
+//
+// SSMuxer is safe to use without initialization. However, it's not safe to move
+// after use.
+type SSMuxer struct {
+	mux             mss.MultistreamMuxer
+	tpts            map[string]sec.SecureTransport
+	OrderPreference []string
+}
+
+var _ sec.SecureMuxer = (*SSMuxer)(nil)
+
+// AddTransport adds a stream security transport to this multistream muxer.
+//
+// This method is *not* thread-safe. It should be called only when initializing
+// the SSMuxer.
+func (sm *SSMuxer) AddTransport(path string, transport sec.SecureTransport) {
+	if sm.tpts == nil {
+		sm.tpts = make(map[string]sec.SecureTransport, 1)
+	}
+
+	sm.mux.AddHandler(path, nil)
+	sm.tpts[path] = transport
+	sm.OrderPreference = append(sm.OrderPreference, path)
+}
+
+// SecureInbound secures an inbound connection using this multistream
+// multiplexed stream security transport.
+func (sm *SSMuxer) SecureInbound(ctx context.Context, insecure net.Conn) (sec.SecureConn, bool, error) {
+	tpt, _, err := sm.selectProto(ctx, insecure, true)
+	if err != nil {
+		return nil, false, err
+	}
+	sconn, err := tpt.SecureInbound(ctx, insecure)
+	return sconn, true, err
+}
+
+// SecureOutbound secures an outbound connection using this multistream
+// multiplexed stream security transport.
+func (sm *SSMuxer) SecureOutbound(ctx context.Context, insecure net.Conn, p peer.ID) (sec.SecureConn, bool, error) {
+	tpt, server, err := sm.selectProto(ctx, insecure, false)
+	if err != nil {
+		return nil, false, err
+	}
+
+	var sconn sec.SecureConn
+	if server {
+		sconn, err = tpt.SecureInbound(ctx, insecure)
+		if err != nil {
+			return nil, false, fmt.Errorf("failed to secure inbound connection: %s", err)
+		}
+		// ensure the correct peer connected to us
+		if sconn.RemotePeer() != p {
+			sconn.Close()
+			return nil, false, fmt.Errorf("Unexpected peer")
+		}
+	} else {
+		sconn, err = tpt.SecureOutbound(ctx, insecure, p)
+	}
+
+	return sconn, server, err
+}
+
+func (sm *SSMuxer) selectProto(ctx context.Context, insecure net.Conn, server bool) (sec.SecureTransport, bool, error) {
+	var proto string
+	var err error
+	var iamserver bool
+	done := make(chan struct{})
+	go func() {
+		defer close(done)
+		if server {
+			iamserver = true
+			proto, _, err = sm.mux.Negotiate(insecure)
+		} else {
+			proto, iamserver, err = mss.SelectWithSimopenOrFail(sm.OrderPreference, insecure)
+		}
+	}()
+
+	select {
+	case <-done:
+		if err != nil {
+			return nil, false, err
+		}
+		if tpt, ok := sm.tpts[proto]; ok {
+			return tpt, iamserver, nil
+		}
+		return nil, false, fmt.Errorf("selected unknown security transport")
+	case <-ctx.Done():
+		// We *must* do this. We have outstanding work on the connection
+		// and it's no longer safe to use.
+		insecure.Close()
+		<-done // wait to stop using the connection.
+		return nil, false, ctx.Err()
+	}
+}

ssms_test.go

+package csms
+
+import (
+	"context"
+	"net"
+	"sync"
+	"testing"
+
+	"github.com/libp2p/go-libp2p-core/peer"
+	"github.com/libp2p/go-libp2p-core/sec"
+	"github.com/libp2p/go-libp2p-core/sec/insecure"
+	tnet "github.com/libp2p/go-libp2p-testing/net"
+	sst "github.com/libp2p/go-libp2p-testing/suites/sec"
+)
+
+type TransportAdapter struct {
+	mux *SSMuxer
+}
+
+func (sm *TransportAdapter) SecureInbound(ctx context.Context, insecure net.Conn) (sec.SecureConn, error) {
+	sconn, _, err := sm.mux.SecureInbound(ctx, insecure)
+	return sconn, err
+}
+
+func (sm *TransportAdapter) SecureOutbound(ctx context.Context, insecure net.Conn, p peer.ID) (sec.SecureConn, error) {
+	sconn, _, err := sm.mux.SecureOutbound(ctx, insecure, p)
+	return sconn, err
+}
+
+func TestCommonProto(t *testing.T) {
+	idA := tnet.RandIdentityOrFatal(t)
+	idB := tnet.RandIdentityOrFatal(t)
+
+	var at, bt SSMuxer
+
+	atInsecure := insecure.NewWithIdentity(idA.ID(), idA.PrivateKey())
+	btInsecure := insecure.NewWithIdentity(idB.ID(), idB.PrivateKey())
+	at.AddTransport("/plaintext/1.0.0", atInsecure)
+	bt.AddTransport("/plaintext/1.1.0", btInsecure)
+	bt.AddTransport("/plaintext/1.0.0", btInsecure)
+	sst.SubtestRW(t, &TransportAdapter{mux: &at}, &TransportAdapter{mux: &bt}, idA.ID(), idB.ID())
+}
+
+func TestNoCommonProto(t *testing.T) {
+	idA := tnet.RandIdentityOrFatal(t)
+	idB := tnet.RandIdentityOrFatal(t)
+
+	var at, bt SSMuxer
+	atInsecure := insecure.NewWithIdentity(idA.ID(), idA.PrivateKey())
+	btInsecure := insecure.NewWithIdentity(idB.ID(), idB.PrivateKey())
+
+	at.AddTransport("/plaintext/1.0.0", atInsecure)
+	bt.AddTransport("/plaintext/1.1.0", btInsecure)
+
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	a, b := net.Pipe()
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go func() {
+		defer wg.Done()
+		defer a.Close()
+		_, _, err := at.SecureInbound(ctx, a)
+		if err == nil {
+			t.Fatal("conection should have failed")
+		}
+	}()
+
+	go func() {
+		defer wg.Done()
+		defer b.Close()
+		_, _, err := bt.SecureOutbound(ctx, b, "peerA")
+		if err == nil {
+			t.Fatal("connection should have failed")
+		}
+	}()
+	wg.Wait()
+}