path: root/p2p/handshake_test.go

package p2p

import (
    "bytes"
    "crypto/rand"
    "fmt"
    "net"
    "reflect"
    "testing"
    "time"

    "github.com/ethereum/go-ethereum/crypto"
    "github.com/ethereum/go-ethereum/crypto/ecies"
    "github.com/ethereum/go-ethereum/p2p/discover"
)

func TestSharedSecret(t *testing.T) {
    prv0, _ := crypto.GenerateKey() // = ecdsa.GenerateKey(crypto.S256(), rand.Reader)
    pub0 := &prv0.PublicKey
    prv1, _ := crypto.GenerateKey()
    pub1 := &prv1.PublicKey

    ss0, err := ecies.ImportECDSA(prv0).GenerateShared(ecies.ImportECDSAPublic(pub1), sskLen, sskLen)
    if err != nil {
        return
    }
    ss1, err := ecies.ImportECDSA(prv1).GenerateShared(ecies.ImportECDSAPublic(pub0), sskLen, sskLen)
    if err != nil {
        return
    }
    t.Logf("Secret:\n%v %x\n%v %x", len(ss0), ss0, len(ss0), ss1)
    if !bytes.Equal(ss0, ss1) {
        t.Errorf("dont match :(")
    }
}

func TestEncHandshake(t *testing.T) {
    for i := 0; i < 20; i++ {
        start := time.Now()
        if err := testEncHandshake(nil); err != nil {
            t.Fatalf("i=%d %v", i, err)
        }
        t.Logf("(without token) %d %v\n", i+1, time.Since(start))
    }

    for i := 0; i < 20; i++ {
        tok := make([]byte, shaLen)
        rand.Reader.Read(tok)
        start := time.Now()
        if err := testEncHandshake(tok); err != nil {
            t.Fatalf("i=%d %v", i, err)
        }
        t.Logf("(with token) %d %v\n", i+1, time.Since(start))
    }
}

func testEncHandshake(token []byte) error {
    type result struct {
        side string
        s    secrets
        err  error
    }
    var (
        prv0, _  = crypto.GenerateKey()
        prv1, _  = crypto.GenerateKey()
        rw0, rw1 = net.Pipe()
        output   = make(chan result)
    )

    go func() {
        r := result{side: "initiator"}
        defer func() { output <- r }()

        pub1s := discover.PubkeyID(&prv1.PublicKey)
        r.s, r.err = initiatorEncHandshake(rw0, prv0, pub1s, token)
        if r.err != nil {
            return
        }
        id1 := discover.PubkeyID(&prv1.PublicKey)
        if r.s.RemoteID != id1 {
            r.err = fmt.Errorf("remote ID mismatch: got %v, want: %v", r.s.RemoteID, id1)
        }
    }()
    go func() {
        r := result{side: "receiver"}
        defer func() { output <- r }()

        r.s, r.err = receiverEncHandshake(rw1, prv1, token)
        if r.err != nil {
            return
        }
        id0 := discover.PubkeyID(&prv0.PublicKey)
        if r.s.RemoteID != id0 {
            r.err = fmt.Errorf("remote ID mismatch: got %v, want: %v", r.s.RemoteID, id0)
        }
    }()

    // wait for results from both sides
    r1, r2 := <-output, <-output

    if r1.err != nil {
        return fmt.Errorf("%s side error: %v", r1.side, r1.err)
    }
    if r2.err != nil {
        return fmt.Errorf("%s side error: %v", r2.side, r2.err)
    }

    // don't compare remote node IDs
    r1.s.RemoteID, r2.s.RemoteID = discover.NodeID{}, discover.NodeID{}
    // flip MACs on one of them so they compare equal
    r1.s.EgressMAC, r1.s.IngressMAC = r1.s.IngressMAC, r1.s.EgressMAC
    if !reflect.DeepEqual(r1.s, r2.s) {
        return fmt.Errorf("secrets mismatch:\n t1: %#v\n t2: %#v", r1.s, r2.s)
    }
    return nil
}

func TestSetupConn(t *testing.T) {
    prv0, _ := crypto.GenerateKey()
    prv1, _ := crypto.GenerateKey()
    node0 := &discover.Node{
        ID:  discover.PubkeyID(&prv0.PublicKey),
        IP:  net.IP{1, 2, 3, 4},
        TCP: 33,
    }
    node1 := &discover.Node{
        ID:  discover.PubkeyID(&prv1.PublicKey),
        IP:  net.IP{5, 6, 7, 8},
        TCP: 44,
    }
    hs0 := &protoHandshake{
        Version: baseProtocolVersion,
        ID:      node0.ID,
        Caps:    []Cap{{"a", 0}, {"b", 2}},
    }
    hs1 := &protoHandshake{
        Version: baseProtocolVersion,
        ID:      node1.ID,
        Caps:    []Cap{{"c", 1}, {"d", 3}},
    }
    fd0, fd1 := net.Pipe()

    done := make(chan struct{})
    go func() {
        defer close(done)
        conn0, err := setupConn(fd0, prv0, hs0, node1, false)
        if err != nil {
            t.Errorf("outbound side error: %v", err)
            return
        }
        if conn0.ID != node1.ID {
            t.Errorf("outbound conn id mismatch: got %v, want %v", conn0.ID, node1.ID)
        }
        if !reflect.DeepEqual(conn0.Caps, hs1.Caps) {
            t.Errorf("outbound caps mismatch: got %v, want %v", conn0.Caps, hs1.Caps)
        }
    }()

    conn1, err := setupConn(fd1, prv1, hs1, nil, false)
    if err != nil {
        t.Fatalf("inbound side error: %v", err)
    }
    if conn1.ID != node0.ID {
        t.Errorf("inbound conn id mismatch: got %v, want %v", conn1.ID, node0.ID)
    }
    if !reflect.DeepEqual(conn1.Caps, hs0.Caps) {
        t.Errorf("inbound caps mismatch: got %v, want %v", conn1.Caps, hs0.Caps)
    }

    <-done
}