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// Copyright (C) 2019-2024 Algorand, Inc.
// This file is part of go-algorand
//
// go-algorand is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as
// published by the Free Software Foundation, either version 3 of the
// License, or (at your option) any later version.
//
// go-algorand 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 Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with go-algorand. If not, see <https://www.gnu.org/licenses/>.
package dnsaddr
import (
"context"
"fmt"
"net"
"testing"
"github.com/multiformats/go-multiaddr"
madns "github.com/multiformats/go-multiaddr-dns"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/algorand/go-algorand/test/partitiontest"
"github.com/algorand/go-algorand/tools/network"
)
func TestIsDnsaddr(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
testcases := []struct {
name string
addr string
expected bool
}{
{name: "DnsAddr", addr: "/dnsaddr/foobar.com", expected: true},
{name: "DnsAddrWithPeerId", addr: "/dnsaddr/foobar.com/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN", expected: true},
{name: "DnsAddrWithIPPeerId", addr: "/dnsaddr/foobar.com/ip4/127.0.0.1/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN", expected: true},
{name: "Dns4Addr", addr: "/dns4/foobar.com/", expected: false},
{name: "Dns6Addr", addr: "/dns6/foobar.com/", expected: false},
{name: "Dns4AddrWithPeerId", addr: "/dns4/foobar.com/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN", expected: false},
}
for _, testcase := range testcases {
t.Run(testcase.name, func(t *testing.T) {
maddr, err := multiaddr.NewMultiaddr(testcase.addr)
require.NoError(t, err)
require.Equal(t, testcase.expected, isDnsaddr(maddr))
})
}
}
func TestMultiaddrsFromResolver(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
dnsaddrCont := NewMultiaddrDNSResolveController(false, "")
// Fail on bad dnsaddr domain
maddrs, err := MultiaddrsFromResolver("/bogus/foobar", dnsaddrCont)
assert.Empty(t, maddrs)
assert.ErrorContains(t, err, fmt.Sprintf("unable to construct multiaddr for %s", "/bogus/foobar"))
// Success on a dnsaddr that needs to resolve recursively
maddrs, err = MultiaddrsFromResolver("bootstrap.libp2p.io", dnsaddrCont)
assert.NoError(t, err)
assert.NotEmpty(t, maddrs)
// bootstrap.libp2p.io's dnsaddr record contains 4 more dnsaddrs to resolve
assert.Greater(t, len(maddrs), 4)
}
type failureResolver struct{}
func (f *failureResolver) LookupIPAddr(context.Context, string) ([]net.IPAddr, error) {
return nil, fmt.Errorf("always errors")
}
func (f *failureResolver) LookupTXT(context.Context, string) ([]string, error) {
return nil, fmt.Errorf("always errors")
}
func TestMultiaddrsFromResolverDnsFailure(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
dnsaddrCont := &MultiaddrDNSResolveController{
resolver: nil,
nextResolvers: nil,
}
// Fail on no resolver
maddrs, err := MultiaddrsFromResolver("0.0.0.1", dnsaddrCont)
assert.Empty(t, maddrs)
assert.ErrorContains(t, err, fmt.Sprintf("passed controller has no resolvers Iterate"))
resolver, _ := madns.NewResolver(madns.WithDefaultResolver(&failureResolver{}))
dnsaddrCont = &MultiaddrDNSResolveController{
resolver: resolver,
nextResolvers: nil,
controller: network.ResolveController{},
}
// Fail on resolver error
maddrs, err = MultiaddrsFromResolver("bootstrap.libp2p.io", dnsaddrCont)
assert.Empty(t, maddrs)
assert.ErrorContains(t, err, "always errors")
}
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