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Merge pull request #14 from libp2p/example
add an example (mainly for development)
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# TLS handshake example | ||
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Run | ||
```bash | ||
go run cmd/tlsdiag.go server | ||
``` |
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package main | ||
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import ( | ||
"fmt" | ||
"os" | ||
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"github.com/libp2p/go-libp2p-tls/cmd/cmdimpl" | ||
) | ||
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func main() { | ||
if len(os.Args) <= 1 { | ||
fmt.Println("missing argument: client / server") | ||
return | ||
} | ||
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role := os.Args[1] | ||
// remove the role argument from os.Args | ||
os.Args = append([]string{os.Args[0]}, os.Args[2:]...) | ||
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var err error | ||
switch role { | ||
case "client": | ||
err = cmdimpl.StartClient() | ||
case "server": | ||
err = cmdimpl.StartServer() | ||
default: | ||
fmt.Println("invalid argument. Expected client / server") | ||
return | ||
} | ||
if err != nil { | ||
panic(err) | ||
} | ||
} |
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package cmdimpl | ||
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import ( | ||
"context" | ||
"flag" | ||
"fmt" | ||
"io/ioutil" | ||
"net" | ||
"time" | ||
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peer "github.com/libp2p/go-libp2p-peer" | ||
libp2ptls "github.com/libp2p/go-libp2p-tls" | ||
) | ||
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func StartClient() error { | ||
port := flag.Int("p", 5533, "port") | ||
peerIDString := flag.String("id", "", "peer ID") | ||
keyType := flag.String("key", "ecdsa", "rsa, ecdsa, ed25519 or secp256k1") | ||
flag.Parse() | ||
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priv, err := generateKey(*keyType) | ||
if err != nil { | ||
return err | ||
} | ||
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peerID, err := peer.IDB58Decode(*peerIDString) | ||
if err != nil { | ||
return err | ||
} | ||
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id, err := peer.IDFromPrivateKey(priv) | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf(" Peer ID: %s\n", id.Pretty()) | ||
tp, err := libp2ptls.New(priv) | ||
if err != nil { | ||
return err | ||
} | ||
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remoteAddr := fmt.Sprintf("localhost:%d", *port) | ||
fmt.Printf("Dialing %s\n", remoteAddr) | ||
conn, err := net.Dial("tcp", remoteAddr) | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf("Dialed raw connection to %s\n", conn.RemoteAddr()) | ||
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) | ||
defer cancel() | ||
sconn, err := tp.SecureOutbound(ctx, conn, peerID) | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf("Authenticated server: %s\n", sconn.RemotePeer().Pretty()) | ||
data, err := ioutil.ReadAll(sconn) | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf("Received message from server: %s\n", string(data)) | ||
return nil | ||
} |
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package cmdimpl | ||
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import ( | ||
"crypto/rand" | ||
"fmt" | ||
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ic "github.com/libp2p/go-libp2p-crypto" | ||
) | ||
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func generateKey(keyType string) (priv ic.PrivKey, err error) { | ||
switch keyType { | ||
case "rsa": | ||
fmt.Printf("Generated new peer with an RSA key.") | ||
priv, _, err = ic.GenerateRSAKeyPair(2048, rand.Reader) | ||
case "ecdsa": | ||
fmt.Printf("Generated new peer with an ECDSA key.") | ||
priv, _, err = ic.GenerateECDSAKeyPair(rand.Reader) | ||
case "ed25519": | ||
fmt.Printf("Generated new peer with an Ed25519 key.") | ||
priv, _, err = ic.GenerateEd25519Key(rand.Reader) | ||
case "secp256k1": | ||
fmt.Printf("Generated new peer with an Secp256k1 key.") | ||
priv, _, err = ic.GenerateSecp256k1Key(rand.Reader) | ||
default: | ||
return nil, fmt.Errorf("unknown key type: %s", keyType) | ||
} | ||
return | ||
} |
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package cmdimpl | ||
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import ( | ||
"context" | ||
"flag" | ||
"fmt" | ||
"net" | ||
"time" | ||
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peer "github.com/libp2p/go-libp2p-peer" | ||
libp2ptls "github.com/libp2p/go-libp2p-tls" | ||
) | ||
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func StartServer() error { | ||
port := flag.Int("p", 5533, "port") | ||
keyType := flag.String("key", "ecdsa", "rsa, ecdsa, ed25519 or secp256k1") | ||
flag.Parse() | ||
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priv, err := generateKey(*keyType) | ||
if err != nil { | ||
return err | ||
} | ||
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id, err := peer.IDFromPrivateKey(priv) | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf(" Peer ID: %s\n", id.Pretty()) | ||
tp, err := libp2ptls.New(priv) | ||
if err != nil { | ||
return err | ||
} | ||
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ln, err := net.Listen("tcp", fmt.Sprintf("localhost:%d", *port)) | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf("Listening for new connections on %s\n", ln.Addr()) | ||
fmt.Printf("Now run the following command in a separate terminal:\n") | ||
fmt.Printf("\tgo run cmd/tlsdiag.go client -p %d -id %s\n", *port, id.Pretty()) | ||
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for { | ||
conn, err := ln.Accept() | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf("Accepted raw connection from %s\n", conn.RemoteAddr()) | ||
go func() { | ||
if err := handleConn(tp, conn); err != nil { | ||
fmt.Printf("Error handling connection from %s: %s\n", conn.RemoteAddr(), err) | ||
} | ||
}() | ||
} | ||
} | ||
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func handleConn(tp *libp2ptls.Transport, conn net.Conn) error { | ||
ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second) | ||
defer cancel() | ||
sconn, err := tp.SecureInbound(ctx, conn) | ||
if err != nil { | ||
return err | ||
} | ||
fmt.Printf("Authenticated client: %s\n", sconn.RemotePeer().Pretty()) | ||
fmt.Fprintf(sconn, "Hello client!") | ||
fmt.Printf("Closing connection to %s\n", conn.RemoteAddr()) | ||
return sconn.Close() | ||
} |