Could not resolve ENS domains

[caunt]

Checklist

• This is a bug report, not a question. Ask questions on discuss.ipfs.io.
• I have searched on the issue tracker for my bug.
• I am running the latest go-ipfs version or have an issue updating.

Installation method

ipfs-update or dist.ipfs.io

Version

% ipfs version --all
go-ipfs version: 0.12.1-da2b9bd71
Repo version: 12
System version: arm64/darwin
Golang version: go1.17.8

Config

% ipfs config show
{
  "API": {
    "HTTPHeaders": {}
  },
  "Addresses": {
    "API": "/ip4/127.0.0.1/tcp/5001",
    "Announce": [],
    "Gateway": "/ip4/127.0.0.1/tcp/8080",
    "NoAnnounce": [],
    "Swarm": [
      "/ip4/0.0.0.0/tcp/4001",
      "/ip6/::/tcp/4001",
      "/ip4/0.0.0.0/udp/4001/quic",
      "/ip6/::/udp/4001/quic"
    ]
  },
  "AutoNAT": {},
  "Bootstrap": [
    "/ip4/104.131.131.82/tcp/4001/p2p/QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ",
    "/ip4/104.131.131.82/udp/4001/quic/p2p/QmaCpDMGvV2BGHeYERUEnRQAwe3N8SzbUtfsmvsqQLuvuJ",
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmQCU2EcMqAqQPR2i9bChDtGNJchTbq5TbXJJ16u19uLTa",
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmbLHAnMoJPWSCR5Zhtx6BHJX9KiKNN6tpvbUcqanj75Nb",
    "/dnsaddr/bootstrap.libp2p.io/p2p/QmcZf59bWwK5XFi76CZX8cbJ4BhTzzA3gU1ZjYZcYW3dwt"
  ],
  "DNS": {
    "Resolvers": {}
  },
  "Datastore": {
    "BloomFilterSize": 0,
    "GCPeriod": "1h",
    "HashOnRead": false,
    "Spec": {
      "mounts": [
        {
          "child": {
            "path": "blocks",
            "shardFunc": "/repo/flatfs/shard/v1/next-to-last/2",
            "sync": true,
            "type": "flatfs"
          },
          "mountpoint": "/blocks",
          "prefix": "flatfs.datastore",
          "type": "measure"
        },
        {
          "child": {
            "compression": "none",
            "path": "datastore",
            "type": "levelds"
          },
          "mountpoint": "/",
          "prefix": "leveldb.datastore",
          "type": "measure"
        }
      ],
      "type": "mount"
    },
    "StorageGCWatermark": 90,
    "StorageMax": "10GB"
  },
  "Discovery": {
    "MDNS": {
      "Enabled": true,
      "Interval": 10
    }
  },
  "Experimental": {
    "AcceleratedDHTClient": false,
    "FilestoreEnabled": false,
    "GraphsyncEnabled": false,
    "Libp2pStreamMounting": false,
    "P2pHttpProxy": false,
    "ShardingEnabled": false,
    "StrategicProviding": false,
    "UrlstoreEnabled": false
  },
  "Gateway": {
    "APICommands": [],
    "HTTPHeaders": {
      "Access-Control-Allow-Headers": [
        "X-Requested-With",
        "Range",
        "User-Agent"
      ],
      "Access-Control-Allow-Methods": [
        "GET"
      ],
      "Access-Control-Allow-Origin": [
        "*"
      ]
    },
    "NoDNSLink": false,
    "NoFetch": false,
    "PathPrefixes": [],
    "PublicGateways": null,
    "RootRedirect": "",
    "Writable": false
  },
  "Identity": {
    "PeerID": "12D3KooWSWdDigvvPvHaEp65UuMd2MbxQDedzKH2pR4sXXPU4ukr"
  },
  "Internal": {},
  "Ipns": {
    "RecordLifetime": "",
    "RepublishPeriod": "",
    "ResolveCacheSize": 128
  },
  "Migration": {
    "DownloadSources": [],
    "Keep": ""
  },
  "Mounts": {
    "FuseAllowOther": false,
    "IPFS": "/ipfs",
    "IPNS": "/ipns"
  },
  "Peering": {
    "Peers": null
  },
  "Pinning": {
    "RemoteServices": {}
  },
  "Plugins": {
    "Plugins": null
  },
  "Provider": {
    "Strategy": ""
  },
  "Pubsub": {
    "DisableSigning": false,
    "Router": ""
  },
  "Reprovider": {
    "Interval": "12h",
    "Strategy": "all"
  },
  "Routing": {
    "Type": "dht"
  },
  "Swarm": {
    "AddrFilters": null,
    "ConnMgr": {
      "GracePeriod": "20s",
      "HighWater": 900,
      "LowWater": 600,
      "Type": "basic"
    },
    "DisableBandwidthMetrics": false,
    "DisableNatPortMap": false,
    "EnableAutoRelay": false,
    "EnableRelayHop": false,
    "Transports": {
      "Multiplexers": {},
      "Network": {},
      "Security": {}
    }
  }
}

Description

DNSLink (eth.link) does not work anymore for unknown reason. I can not resolve any .eth ENS domain through dweb.link gateway:
https://vitalik-eth.ipns.dweb.link/
https://vitalik.eth.ipns.dweb.link/

ipfs resolve -r /ipns/vitalik.eth/: could not resolve name: "vitalik.eth" is missing a DNSLink record (https://docs.ipfs.io/concepts/dnslink/)

[caunt]

The problem is in cloudflare EthDNS resolver:

% curl -H 'content-type: application/dns-json' 'https://resolver.cloudflare-eth.com/dns-query?type=TXT&name=vitalik.eth'
{"AD":true,"CD":false,"RA":true,"RD":true,"TC":false,"Status":2,"Question":[{"name":"vitalik.eth.","type":16}],"Answer":[]}

Status 2 means SERVFAIL error. Should be 0.
I think we should add fallback possibility for *.eth resolvers. If field "Status" not equals 0, then try next one resolver.

Also I see there is no alternative *.eth resolvers on internet. I can run my one for longterm if you agree.

[lidel]

Notes from triage:

• When the implicit default resolver for .eth fails, user can choose a different one by setting DNS.Resolvers in their config.
  • The errror at resolver.cloudflare-eth.com should be raised with Cloudflare or ENS projects (this is a third-party service), and not the go-ipfs repo. Since there is no bug in go-ipfs, I'm closing this issue.
• Fallback DNS resolvers are already tracked in Add DNS Fallback Resolvers #8173 – feel free to provide feedback there 🙏

[livid]

This problem is happening right now.

Many IPFS gateways, including ipfs.io and cloudflare-ipfs.com are unable to resolve ENS domains.

Even kubo CLI and Brave's support for IPFS + ENS websites are impacted:

[Stebalien]

May have been a glitch in eth.link? It appears to be working now.

[livid]

May have been a glitch in eth.link? It appears to be working now.

It is working now. I have confirmed with someone from Cloudflare.

Currently, resolver for .eth is defined in the 16th line here:

https://github.com/ipfs/kubo/blob/master/core/node/dns.go#L16

But I cannot find alternative resolvers for it.

[livid]

If you googled and found this page for alternative ENS resolver, here is one provided by eth.limo:

https://eth-limo.gitbook.io/documentation/ipfs/config