path: root/p2p/discover/node_test.go

// Copyright 2015 The go-ethereum Authors
// This file is part of the go-ethereum library.
//
// The go-ethereum library is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// The go-ethereum library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.

package discover

import (
    "fmt"
    "math/big"
    "math/rand"
    "net"
    "reflect"
    "strings"
    "testing"
    "testing/quick"
    "time"

    "github.com/ethereum/go-ethereum/common"
    "github.com/ethereum/go-ethereum/crypto"
)

func ExampleNewNode() {
    id := MustHexID("1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439")

    // Complete nodes contain UDP and TCP endpoints:
    n1 := NewNode(id, net.ParseIP("2001:db8:3c4d:15::abcd:ef12"), 52150, 30303)
    fmt.Println("n1:", n1)
    fmt.Println("n1.Incomplete() ->", n1.Incomplete())

    // An incomplete node can be created by passing zero values
    // for all parameters except id.
    n2 := NewNode(id, nil, 0, 0)
    fmt.Println("n2:", n2)
    fmt.Println("n2.Incomplete() ->", n2.Incomplete())

    // Output:
    // n1: enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[2001:db8:3c4d:15::abcd:ef12]:30303?discport=52150
    // n1.Incomplete() -> false
    // n2: enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439
    // n2.Incomplete() -> true
}

var parseNodeTests = []struct {
    rawurl     string
    wantError  string
    wantResult *Node
}{
    {
        rawurl:    "http://foobar",
        wantError: `invalid URL scheme, want "enode"`,
    },
    {
        rawurl:    "enode://01010101@123.124.125.126:3",
        wantError: `invalid node ID (wrong length, want 128 hex chars)`,
    },
    // Complete nodes with IP address.
    {
        rawurl:    "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@hostname:3",
        wantError: `invalid IP address`,
    },
    {
        rawurl:    "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:foo",
        wantError: `invalid port`,
    },
    {
        rawurl:    "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:3?discport=foo",
        wantError: `invalid discport in query`,
    },
    {
        rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150",
        wantResult: NewNode(
            MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
            net.IP{0x7f, 0x0, 0x0, 0x1},
            52150,
            52150,
        ),
    },
    {
        rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[::]:52150",
        wantResult: NewNode(
            MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
            net.ParseIP("::"),
            52150,
            52150,
        ),
    },
    {
        rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@[2001:db8:3c4d:15::abcd:ef12]:52150",
        wantResult: NewNode(
            MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
            net.ParseIP("2001:db8:3c4d:15::abcd:ef12"),
            52150,
            52150,
        ),
    },
    {
        rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439@127.0.0.1:52150?discport=22334",
        wantResult: NewNode(
            MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
            net.IP{0x7f, 0x0, 0x0, 0x1},
            22334,
            52150,
        ),
    },
    // Incomplete nodes with no address.
    {
        rawurl: "1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439",
        wantResult: NewNode(
            MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
            nil, 0, 0,
        ),
    },
    {
        rawurl: "enode://1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439",
        wantResult: NewNode(
            MustHexID("0x1dd9d65c4552b5eb43d5ad55a2ee3f56c6cbc1c64a5c8d659f51fcd51bace24351232b8d7821617d2b29b54b81cdefb9b3e9c37d7fd5f63270bcc9e1a6f6a439"),
            nil, 0, 0,
        ),
    },
    // Invalid URLs
    {
        rawurl:    "01010101",
        wantError: `invalid node ID (wrong length, want 128 hex chars)`,
    },
    {
        rawurl:    "enode://01010101",
        wantError: `invalid node ID (wrong length, want 128 hex chars)`,
    },
    {
        // This test checks that errors from url.Parse are handled.
        rawurl:    "://foo",
        wantError: `parse ://foo: missing protocol scheme`,
    },
}

func TestParseNode(t *testing.T) {
    for _, test := range parseNodeTests {
        n, err := ParseNode(test.rawurl)
        if test.wantError != "" {
            if err == nil {
                t.Errorf("test %q:\n  got nil error, expected %#q", test.rawurl, test.wantError)
                continue
            } else if err.Error() != test.wantError {
                t.Errorf("test %q:\n  got error %#q, expected %#q", test.rawurl, err.Error(), test.wantError)
                continue
            }
        } else {
            if err != nil {
                t.Errorf("test %q:\n  unexpected error: %v", test.rawurl, err)
                continue
            }
            if !reflect.DeepEqual(n, test.wantResult) {
                t.Errorf("test %q:\n  result mismatch:\ngot:  %#v, want: %#v", test.rawurl, n, test.wantResult)
            }
        }
    }
}

func TestNodeString(t *testing.T) {
    for i, test := range parseNodeTests {
        if test.wantError == "" && strings.HasPrefix(test.rawurl, "enode://") {
            str := test.wantResult.String()
            if str != test.rawurl {
                t.Errorf("test %d: Node.String() mismatch:\ngot:  %s\nwant: %s", i, str, test.rawurl)
            }
        }
    }
}

func TestHexID(t *testing.T) {
    ref := NodeID{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 128, 106, 217, 182, 31, 165, 174, 1, 67, 7, 235, 220, 150, 66, 83, 173, 205, 159, 44, 10, 57, 42, 161, 26, 188}
    id1 := MustHexID("0x000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")
    id2 := MustHexID("000000000000000000000000000000000000000000000000000000000000000000000000000000806ad9b61fa5ae014307ebdc964253adcd9f2c0a392aa11abc")

    if id1 != ref {
        t.Errorf("wrong id1\ngot  %v\nwant %v", id1[:], ref[:])
    }
    if id2 != ref {
        t.Errorf("wrong id2\ngot  %v\nwant %v", id2[:], ref[:])
    }
}

func TestNodeID_recover(t *testing.T) {
    prv := newkey()
    hash := make([]byte, 32)
    sig, err := crypto.Sign(hash, prv)
    if err != nil {
        t.Fatalf("signing error: %v", err)
    }

    pub := PubkeyID(&prv.PublicKey)
    recpub, err := recoverNodeID(hash, sig)
    if err != nil {
        t.Fatalf("recovery error: %v", err)
    }
    if pub != recpub {
        t.Errorf("recovered wrong pubkey:\ngot:  %v\nwant: %v", recpub, pub)
    }

    ecdsa, err := pub.Pubkey()
    if err != nil {
        t.Errorf("Pubkey error: %v", err)
    }
    if !reflect.DeepEqual(ecdsa, &prv.PublicKey) {
        t.Errorf("Pubkey mismatch:\n  got:  %#v\n  want: %#v", ecdsa, &prv.PublicKey)
    }
}

func TestNodeID_pubkeyBad(t *testing.T) {
    ecdsa, err := NodeID{}.Pubkey()
    if err == nil {
        t.Error("expected error for zero ID")
    }
    if ecdsa != nil {
        t.Error("expected nil result")
    }
}

func TestNodeID_distcmp(t *testing.T) {
    distcmpBig := func(target, a, b common.Hash) int {
        tbig := new(big.Int).SetBytes(target[:])
        abig := new(big.Int).SetBytes(a[:])
        bbig := new(big.Int).SetBytes(b[:])
        return new(big.Int).Xor(tbig, abig).Cmp(new(big.Int).Xor(tbig, bbig))
    }
    if err := quick.CheckEqual(distcmp, distcmpBig, quickcfg()); err != nil {
        t.Error(err)
    }
}

// the random tests is likely to miss the case where they're equal.
func TestNodeID_distcmpEqual(t *testing.T) {
    base := common.Hash{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
    x := common.Hash{15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0}
    if distcmp(base, x, x) != 0 {
        t.Errorf("distcmp(base, x, x) != 0")
    }
}

func TestNodeID_logdist(t *testing.T) {
    logdistBig := func(a, b common.Hash) int {
        abig, bbig := new(big.Int).SetBytes(a[:]), new(big.Int).SetBytes(b[:])
        return new(big.Int).Xor(abig, bbig).BitLen()
    }
    if err := quick.CheckEqual(logdist, logdistBig, quickcfg()); err != nil {
        t.Error(err)
    }
}

// the random tests is likely to miss the case where they're equal.
func TestNodeID_logdistEqual(t *testing.T) {
    x := common.Hash{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
    if logdist(x, x) != 0 {
        t.Errorf("logdist(x, x) != 0")
    }
}

func TestNodeID_hashAtDistance(t *testing.T) {
    // we don't use quick.Check here because its output isn't
    // very helpful when the test fails.
    cfg := quickcfg()
    for i := 0; i < cfg.MaxCount; i++ {
        a := gen(common.Hash{}, cfg.Rand).(common.Hash)
        dist := cfg.Rand.Intn(len(common.Hash{}) * 8)
        result := hashAtDistance(a, dist)
        actualdist := logdist(result, a)

        if dist != actualdist {
            t.Log("a:     ", a)
            t.Log("result:", result)
            t.Fatalf("#%d: distance of result is %d, want %d", i, actualdist, dist)
        }
    }
}

func quickcfg() *quick.Config {
    return &quick.Config{
        MaxCount: 5000,
        Rand:     rand.New(rand.NewSource(time.Now().Unix())),
    }
}

// TODO: The Generate method can be dropped when we require Go >= 1.5
// because testing/quick learned to generate arrays in 1.5.

func (NodeID) Generate(rand *rand.Rand, size int) reflect.Value {
    var id NodeID
    m := rand.Intn(len(id))
    for i := len(id) - 1; i > m; i-- {
        id[i] = byte(rand.Uint32())
    }
    return reflect.ValueOf(id)
}