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// Copyright (C) 2019-2023 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 network
import (
"context"
"net"
"testing"
"time"
"github.com/stretchr/testify/require"
"github.com/algorand/go-algorand/test/partitiontest"
)
func TestResolverWithDefaultDNSResolution(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
// configure a resolver that has no specific DNS address defined.
// we want to make sure that it will go to the default DNS server ( 8.8.8.8 )
resolver := Resolver{}
cname, addrs, err := resolver.LookupSRV(context.Background(), "telemetry", "tls", "devnet.algodev.network")
require.NoError(t, err)
require.Equal(t, "_telemetry._tls.devnet.algodev.network.", cname)
require.True(t, len(addrs) == 1)
require.Equal(t, defaultDNSAddress, resolver.EffectiveResolverDNS())
}
func TestResolverWithCloudflareDNSResolution(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
resolver := Resolver{}
// The test previously specified Cloudflare's primary DNS server (1.1.1.1).
// However, CircleCI began blocking requests to 1.1.1.1. In order to
// preserve the test's spirit, it now uses Cloudflare's secondary DNS
// server (1.0.0.1).
cloudflareIPAddr, _ := net.ResolveIPAddr("ip", "1.0.0.1")
resolver = Resolver{
dnsAddress: *cloudflareIPAddr,
}
cname, addrs, err := resolver.LookupSRV(context.Background(), "telemetry", "tls", "devnet.algodev.network")
require.NoError(t, err)
require.Equal(t, "_telemetry._tls.devnet.algodev.network.", cname)
require.True(t, len(addrs) == 1)
require.Equal(t, "1.0.0.1", resolver.EffectiveResolverDNS())
}
func TestResolverWithInvalidDNSResolution(t *testing.T) {
partitiontest.PartitionTest(t)
t.Parallel()
resolver := Resolver{}
// specify an invalid dns resolver ip address and examine the fail case.
dummyIPAddr, _ := net.ResolveIPAddr("ip", "255.255.128.1")
resolver = Resolver{
dnsAddress: *dummyIPAddr,
}
timingOutContext, timingOutContextFunc := context.WithTimeout(context.Background(), time.Duration(100)*time.Millisecond)
defer timingOutContextFunc()
cname, addrs, err := resolver.LookupSRV(timingOutContext, "telemetry", "tls", "devnet.algodev.network")
require.Error(t, err)
require.Equal(t, "", cname)
require.True(t, len(addrs) == 0)
require.Equal(t, "255.255.128.1", resolver.EffectiveResolverDNS())
}
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