Integrate dns resolving (#615)

* integrate dns

* give hostname to transport dial

* add hostname test

* switched to websock master

* Add dnsaddr dial test w multiple transports

libp2p.nimble

@@ -16,7 +16,7 @@ requires "nim >= 1.2.0",
          "metrics",
          "secp256k1",
          "stew#head",
-         "https://github.com/status-im/nim-websock"
+         "websock"
 
 proc runTest(filename: string, verify: bool = true, sign: bool = true,
              moreoptions: string = "") =

libp2p/dialer.nim

@@ -20,6 +20,7 @@ import dial,
        connmanager,
        stream/connection,
        transports/transport,
+       nameresolving/nameresolver,
        errors
 
 export dial, errors
@@ -41,6 +42,7 @@ type
     connManager: ConnManager
     dialLock: Table[PeerID, AsyncLock]
     transports: seq[Transport]
+    nameResolver: NameResolver
 
 proc dialAndUpgrade(
   self: Dialer,
@@ -49,23 +51,28 @@ proc dialAndUpgrade(
   Future[Connection] {.async.} =
   debug "Dialing peer", peerId
 
-  # Avoid "cannot be captured as it would violate memory safety" errors in Nim-1.4.x.
+  for address in addrs:      # for each address
-  var
+    let
-    transport: Transport
+      hostname = address.getHostname()
-    address: MultiAddress
+      resolvedAddresses =
+        if isNil(self.nameResolver): @[address]
+        else: await self.nameResolver.resolveMAddress(address)
 
-  for t in self.transports: # for each transport
+    for a in resolvedAddresses:      # for each resolved address
-    transport = t
+      for transport in self.transports: # for each transport
-    for a in addrs:      # for each address
+        if transport.handles(a):   # check if it can dial it
-      address = a
+          trace "Dialing address", address = $a, peerId, hostname
-      if t.handles(a):   # check if it can dial it
-        trace "Dialing address", address = $a, peerId
           let dialed = try:
               libp2p_total_dial_attempts.inc()
               # await a connection slot when the total
               # connection count is equal to `maxConns`
+              #
+              # Need to copy to avoid "cannot be captured" errors in Nim-1.4.x.
+              let
+                transportCopy = transport
+                addressCopy = a
               await self.connManager.trackOutgoingConn(
-              () => transport.dial(address)
+                () => transportCopy.dial(hostname, addressCopy)
               )
             except TooManyConnectionsError as exc:
               trace "Connection limit reached!"
@@ -234,9 +241,11 @@ proc new*(
   localPeerId: PeerId,
   connManager: ConnManager,
   transports: seq[Transport],
-  ms: MultistreamSelect): Dialer =
+  ms: MultistreamSelect,
+  nameResolver: NameResolver = nil): Dialer =
 
   T(localPeerId: localPeerId,
     connManager: connManager,
     transports: transports,
-    ms: ms)
+    ms: ms,
+    nameResolver: nameResolver)

libp2p/nameresolving/nameresolver.nim

@@ -40,12 +40,10 @@ method resolveIp*(
 
   doAssert(false, "Not implemented!")
 
-proc getHostname(ma: MultiAddress): string =
+proc getHostname*(ma: MultiAddress): string =
-  var dnsbuf = newSeq[byte](256)
+  let firstPart = ($ma[0].get()).split('/')
-
+  if firstPart.len > 1: firstPart[2]
-  let dnsLen = ma[0].get().protoArgument(dnsbuf).get()
+  else: ""
-  dnsbuf.setLen(dnsLen)
-  return string.fromBytes(dnsbuf)
 
 proc resolveDnsAddress(
   self: NameResolver,
@@ -122,12 +120,11 @@ proc resolveDnsAddr(
   return result
 
 
-proc resolveMAddresses*(
+proc resolveMAddress*(
   self: NameResolver,
-  addrs: seq[MultiAddress]): Future[seq[MultiAddress]] {.async.} =
+  address: MultiAddress): Future[seq[MultiAddress]] {.async.} =
   var res = initOrderedSet[MultiAddress]()
 
-  for address in addrs:
   if not DNS.matchPartial(address):
     res.incl(address)
   else:

libp2p/switch.nim

@@ -273,7 +273,7 @@ proc newSwitch*(peerInfo: PeerInfo,
     transports: transports,
     connManager: connManager,
     peerStore: PeerStore.new(),
-    dialer: Dialer.new(peerInfo.peerId, connManager, transports, ms),
+    dialer: Dialer.new(peerInfo.peerId, connManager, transports, ms, nameResolver),
     nameResolver: nameResolver)
 
   switch.connManager.peerStore = switch.peerStore

libp2p/transports/tcptransport.nim

@@ -199,6 +199,7 @@ method accept*(self: TcpTransport): Future[Connection] {.async, gcsafe.} =
 
 method dial*(
   self: TcpTransport,
+  hostname: string,
   address: MultiAddress): Future[Connection] {.async, gcsafe.} =
   ## dial a peer
   ##

libp2p/transports/transport.nim

@@ -60,12 +60,18 @@ method accept*(self: Transport): Future[Connection]
 
 method dial*(
   self: Transport,
+  hostname: string,
   address: MultiAddress): Future[Connection] {.base, gcsafe.} =
   ## dial a peer
   ##
 
   doAssert(false, "Not implemented!")
 
+proc dial*(
+  self: Transport,
+  address: MultiAddress): Future[Connection] {.gcsafe.} =
+  self.dial("", address)
+
 method upgradeIncoming*(
   self: Transport,
   conn: Connection): Future[void] {.base, gcsafe.} =

libp2p/transports/wstransport.nim

@@ -207,6 +207,7 @@ method accept*(self: WsTransport): Future[Connection] {.async, gcsafe.} =
 
 method dial*(
   self: WsTransport,
+  hostname: string,
   address: MultiAddress): Future[Connection] {.async, gcsafe.} =
   ## dial a peer
   ##
@@ -219,6 +220,7 @@ method dial*(
       address.initTAddress().tryGet(),
       "",
       secure = secure,
+      hostName = hostname,
       flags = self.tlsFlags)
 
   return await self.connHandler(transp, Direction.Out)

tests/testnameresolve.nim

@@ -59,7 +59,7 @@ suite "Name resolving":
     var resolver {.threadvar.}: MockResolver
 
     proc testOne(input: string, output: seq[Multiaddress]): bool =
-      let resolved = waitFor resolver.resolveMAddresses(@[Multiaddress.init(input).tryGet()])
+      let resolved = waitFor resolver.resolveMAddress(Multiaddress.init(input).tryGet())
       if resolved != output:
         echo "Expected ", output
         echo "Got ", resolved
@@ -90,18 +90,6 @@ suite "Name resolving":
 
       check testOne("/ip6/::1/tcp/0", "/ip6/::1/tcp/0")
 
-    asyncTest "test multiple resolve":
-      resolver.ipResponses[("localhost", false)] = @["127.0.0.1"]
-      resolver.ipResponses[("localhost", true)] = @["::1"]
-
-      let resolved = waitFor resolver.resolveMAddresses(@[
-        Multiaddress.init("/dns/localhost/udp/0").tryGet(),
-        Multiaddress.init("/dns4/localhost/udp/0").tryGet(),
-        Multiaddress.init("/dns6/localhost/udp/0").tryGet(),
-        ])
-
-      check resolved == @[Multiaddress.init("/ip4/127.0.0.1/udp/0").tryGet(), Multiaddress.init("/ip6/::1/udp/0").tryGet()]
-
     asyncTest "dnsaddr recursive test":
       resolver.txtResponses["_dnsaddr.bootstrap.libp2p.io"] = @[
         "dnsaddr=/dnsaddr/sjc-1.bootstrap.libp2p.io/tcp/4001/p2p/QmNnooDu7bfjPFoTZYxMNLWUQJyrVwtbZg5gBMjTezGAJN",

tests/testswitch.nim

@@ -21,7 +21,8 @@ import ../libp2p/[errors,
                   nameresolving/nameresolver,
                   nameresolving/mockresolver,
                   stream/chronosstream,
-                  transports/tcptransport]
+                  transports/tcptransport,
+                  transports/wstransport]
 import ./helpers
 
 const
@@ -463,7 +464,7 @@ suite "Switch":
 
     let switch1 = newStandardSwitch()
 
-    let rng = newRng()
+    let rng = crypto.newRng()
     # use same private keys to emulate two connection from same peer
     let privKey = PrivateKey.random(rng[]).tryGet()
     let switch2 = newStandardSwitch(
@@ -530,7 +531,7 @@ suite "Switch":
   asyncTest "e2e should allow dropping peer from connection events":
     var awaiters: seq[Future[void]]
 
-    let rng = newRng()
+    let rng = crypto.newRng()
     # use same private keys to emulate two connection from same peer
     let
       privateKey = PrivateKey.random(rng[]).tryGet()
@@ -573,7 +574,7 @@ suite "Switch":
   asyncTest "e2e should allow dropping multiple connections for peer from connection events":
     var awaiters: seq[Future[void]]
 
-    let rng = newRng()
+    let rng = crypto.newRng()
     # use same private keys to emulate two connection from same peer
     let
       privateKey = PrivateKey.random(rng[]).tryGet()
@@ -901,5 +902,79 @@ suite "Switch":
       switch1.peerStore.addressBook.get(switch2.peerInfo.peerId) == switch2.peerInfo.addrs.toHashSet()
       switch2.peerStore.addressBook.get(switch1.peerInfo.peerId) == switch1.peerInfo.addrs.toHashSet()
 
-      switch1.peerStore.addressBook.get(switch2.peerInfo.peerId) == switch2.peerInfo.addrs.toHashSet()
+      switch1.peerStore.protoBook.get(switch2.peerInfo.peerId) == switch2.peerInfo.protocols.toHashSet()
-      switch2.peerStore.addressBook.get(switch1.peerInfo.peerId) == switch1.peerInfo.addrs.toHashSet()
+      switch2.peerStore.protoBook.get(switch1.peerInfo.peerId) == switch1.peerInfo.protocols.toHashSet()
+
+  asyncTest "e2e dial dns4 address":
+    var awaiters: seq[Future[void]]
+    let resolver = MockResolver.new()
+    resolver.ipResponses[("localhost", false)] = @["127.0.0.1"]
+    resolver.ipResponses[("localhost", true)] = @["::1"]
+
+    let
+      srcSwitch = newStandardSwitch(nameResolver = resolver)
+      destSwitch = newStandardSwitch()
+
+    awaiters.add(await destSwitch.start())
+    awaiters.add(await srcSwitch.start())
+    await allFuturesThrowing(awaiters)
+
+    let testAddr = MultiAddress.init("/dns4/localhost/").tryGet() &
+                    destSwitch.peerInfo.addrs[0][1].tryGet()
+
+    await srcSwitch.connect(destSwitch.peerInfo.peerId, @[testAddr])
+    check srcSwitch.isConnected(destSwitch.peerInfo.peerId)
+
+    await destSwitch.stop()
+    await srcSwitch.stop()
+
+  asyncTest "e2e dial dnsaddr with multiple transports":
+    var awaiters: seq[Future[void]]
+    let resolver = MockResolver.new()
+
+    let
+      wsAddress = MultiAddress.init("/ip4/127.0.0.1/tcp/0/ws").tryGet()
+      tcpAddress = MultiAddress.init("/ip4/127.0.0.1/tcp/0").tryGet()
+
+      srcTcpSwitch = newStandardSwitch(nameResolver = resolver)
+      srcWsSwitch =
+        SwitchBuilder.new()
+        .withAddress(wsAddress)
+        .withRng(crypto.newRng())
+        .withMplex()
+        .withTransport(proc (upgr: Upgrade): Transport = WsTransport.new(upgr))
+        .withNameResolver(resolver)
+        .withNoise()
+        .build()
+
+      destSwitch =
+        SwitchBuilder.new()
+        .withAddresses(@[tcpAddress, wsAddress])
+        .withRng(crypto.newRng())
+        .withMplex()
+        .withTransport(proc (upgr: Upgrade): Transport = WsTransport.new(upgr))
+        .withTcpTransport()
+        .withNoise()
+        .build()
+
+    awaiters.add(await destSwitch.start())
+    awaiters.add(await srcTcpSwitch.start())
+    awaiters.add(await srcWsSwitch.start())
+    await allFuturesThrowing(awaiters)
+
+    resolver.txtResponses["_dnsaddr.test.io"] = @[
+      "dnsaddr=/ip4/127.0.0.1" & $destSwitch.peerInfo.addrs[1][1].tryGet() & "/ws",
+      "dnsaddr=/ip4/127.0.0.1" & $destSwitch.peerInfo.addrs[0][1].tryGet()
+    ]
+
+    let testAddr = MultiAddress.init("/dnsaddr/test.io/").tryGet()
+
+    await srcTcpSwitch.connect(destSwitch.peerInfo.peerId, @[testAddr])
+    check srcTcpSwitch.isConnected(destSwitch.peerInfo.peerId)
+
+    await srcWsSwitch.connect(destSwitch.peerInfo.peerId, @[testAddr])
+    check srcWsSwitch.isConnected(destSwitch.peerInfo.peerId)
+
+    await destSwitch.stop()
+    await srcWsSwitch.stop()
+    await srcTcpSwitch.stop()

tests/testwstransport.nim

@@ -15,56 +15,39 @@ import ./helpers, ./commontransport
 const
   SecureKey* = """
 -----BEGIN PRIVATE KEY-----
-MIIEvgIBADANBgkqhkiG9w0BAQEFAASCBKgwggSkAgEAAoIBAQCdNv0SX02aeZ4/
+MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAP0yH7F7FtGunC91
-Yc+p/Kwd5UVOHlpmK7/TVC/kcjFbdoUuKNn8pnX/fyhgSKpUYut+te7YRiZhqlaL
+IPkU+u8B4gdxiwYW0J3PrixtB1Xz3e4dfjwQqhIJlG6BxQ4myCxmSPjxP/eOOYp+
-EZKjfy8GBZwXZnJCevFkTvGTTebXXExLIsLGfJqKeLAdFCQkX8wV3jV1DT5JLV+D
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-+wD7/PRTAgMBAAECggEBAJuXPEbegxMKog7gYoE9S6oaqchySc0sJyCjBPL2ANsg
+k159ev138J23VfNgRQJBAP768qHOCnplKIe69SVUWlsQ5nnnybDBMq2YVATbombz
-JRZV38cnh0hhNDh2MfxqGd7Bd6wbYQjvZ88iiRm+WW+ARcby4MnimtxHNNYwFvG0
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-a8QJBxCy6UeogUeKvGks8VQ34SZXLimmgrL9Mlljv0v9PloEkVYbztYyX4GVO0ov
+NABr5ec1FxuJa/8=
-3oH+hKO+/MclzNDyeXZx3Vv4K+UCgYEAwnyb7tqp7fRqm/8EymIZV5pa0p6h609p
-EhCBi9ii6d/ewEjsBhs7bPDBO4PO9ylvOvryYZH1hVbQja2anOCBjO8dAHRHWM86
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-/j+y6NXBTgdOfLRl0lzhj2/JrzdWBtie6tR9UloCaXSKmb04PTFY+kvDWsUCgYBR
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-RUUkZ3PzWVZgFlCjPAcadbBUYHEMbt7sw7Z98ToIFmqspo53AIVD8yQzwtKIz1KW
-eXPAx+sdOUV008ivCBIxOVNswPMfzED4S7Bxpw3iQQKBgGJhct2nBsgu0l2/wzh9
-tpKbalW1RllgptNQzjuBEZMTvPF0L+7BE09/exKtt4N9s3yAzi8o6Qo7RHX5djVc
-SNgafV4jj7jt2Ilh6KOy9dshtLoEkS1NmiqfVe2go2auXZdyGm+I2yzKWdKGDO0J
-diTtYf1sA0PgNXdSyDC03TZl
 -----END PRIVATE KEY-----
 """
 
   SecureCert* = """
 -----BEGIN CERTIFICATE-----
-MIIDazCCAlOgAwIBAgIUe9fr78Dz9PedQ5Sq0uluMWQhX9wwDQYJKoZIhvcNAQEL
+MIICjDCCAfWgAwIBAgIURjeiJmkNbBVktqXvnXh44DKx364wDQYJKoZIhvcNAQEL
-BQAwRTELMAkGA1UEBhMCSU4xEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
+BQAwVzELMAkGA1UEBhMCQVUxEzARBgNVBAgMClNvbWUtU3RhdGUxITAfBgNVBAoM
-GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDAeFw0yMTAzMTcwOTMzMzZaFw0zMTAz
+GEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEQMA4GA1UEAwwHd3MudGVzdDAgFw0y
-MTUwOTMzMzZaMEUxCzAJBgNVBAYTAklOMRMwEQYDVQQIDApTb21lLVN0YXRlMSEw
+MTA5MTQxMTU2NTZaGA8yMDgyMDgzMDExNTY1NlowVzELMAkGA1UEBhMCQVUxEzAR
-HwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQwggEiMA0GCSqGSIb3DQEB
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-AQUAA4IBDwAwggEKAoIBAQCdNv0SX02aeZ4/Yc+p/Kwd5UVOHlpmK7/TVC/kcjFb
+IEx0ZDEQMA4GA1UEAwwHd3MudGVzdDCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkC
-doUuKNn8pnX/fyhgSKpUYut+te7YRiZhqlaLEZKjfy8GBZwXZnJCevFkTvGTTebX
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+VR0OBBYEFHaV2ief8/Que1wxcZ8ACfdW7NUNMB8GA1UdIwQYMBaAFHaV2ief8/Qu
-/+dApXiP6hMV04CQJNnas3NyRxTDR9dNel+3+wD7/PRTAgMBAAGjUzBRMB0GA1Ud
+e1wxcZ8ACfdW7NUNMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADgYEA
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+iEaNOKF6OM0n7GLSDIrBeIWAxL9Ra/dFFwCxl+9wxg8yyzEJDBkAhXkrfp2b4Sx6
-D71VH7F8GOQXITFXCrHwEq1Fx3ScuSnL04NJrXw/e9huzLVQOchAYp/EIn4x2utN
+wdK6xU2VOAxI0GUzwzjcyNl7RDFA3ayFaGl+9+oppWM=
-S31dt94wvi/IysOVbR1LatYNF5kKgGj2Wc6DH0PswBMk8R1G8QMeCz+hCjf1VDHe
-AAW1x2q20rJAvUrT6cRBQqeiMzQj0OaJbvfnd2hu0/d0DFkcuGVgBa2zlbG5rbdU
-Jnq7MQfSaZHd0uBgiKkS+Zw6XaYfWfByCAGSnUqRdOChiJ2stFVLvu+9oQ+PJjJt
-Er1u9bKTUyeuYpqXr2BP9dqphwu8R4NFVUg6DIRpMFMsybaL7KAd4hD22RXCvc0m
-uLu7KODi+eW62MHqs4N2
 -----END CERTIFICATE-----
 """
 
@@ -86,3 +69,30 @@ suite "WebSocket transport":
         TLSCertificate.init(SecureCert),
         {TLSFlags.NoVerifyHost, TLSFlags.NoVerifyServerName}),
       "/ip4/0.0.0.0/tcp/0/wss")
+
+  asyncTest "Hostname verification":
+    let ma: MultiAddress = Multiaddress.init("/ip4/0.0.0.0/tcp/0/wss").tryGet()
+    let transport1 = WsTransport.new(Upgrade(), TLSPrivateKey.init(SecureKey), TLSCertificate.init(SecureCert), {TLSFlags.NoVerifyHost})
+
+    await transport1.start(ma)
+    proc acceptHandler() {.async, gcsafe.} =
+      while true:
+        let conn = await transport1.accept()
+        if not isNil(conn):
+          await conn.close()
+
+    let handlerWait = acceptHandler()
+
+    # ws.test is in certificate
+    let conn = await transport1.dial("ws.test", transport1.ma)
+
+    await conn.close()
+
+    try:
+      let conn = await transport1.dial("ws.wronghostname", transport1.ma)
+      check false
+    except CatchableError as exc:
+      check true
+
+    await handlerWait.cancelAndWait()
+    await transport1.stop()