From 45b311fe9c9cede9d6212cc08d155f4c17f8b5b9 Mon Sep 17 00:00:00 2001 From: kdeme Date: Fri, 11 Oct 2024 17:06:07 +0200 Subject: [PATCH] Add ENR Record.init and update call for dual stack --- eth/p2p/discoveryv5/enr.nim | 116 +++++++++++++++++++++++++++++++++++- 1 file changed, 115 insertions(+), 1 deletion(-) diff --git a/eth/p2p/discoveryv5/enr.nim b/eth/p2p/discoveryv5/enr.nim index 803dc91..6e02d92 100644 --- a/eth/p2p/discoveryv5/enr.nim +++ b/eth/p2p/discoveryv5/enr.nim @@ -243,7 +243,9 @@ func init*( extraFields: openArray[FieldPair] = []): EnrResult[T] = ## Initialize a `Record` with given sequence number, private key, optional - ## ip address, tcp port, udp port, and optional custom k:v pairs. + ## IP address, TCP port, UDP port, and optional custom k:v pairs. + ## + ## The IP address can be an IPv4 or IPv6 address. ## ## Can fail in case the record exceeds the `maxEnrSize`. doAssert(not hasPredefinedKey(extraFields), "Predefined key in custom pairs") @@ -254,6 +256,51 @@ func init*( fields.insert extraFields makeEnrAux(seqNum, "v4", pk, fields) +func init*( + T: type Record, + seqNum: uint64, pk: PrivateKey, + ip4: array[4, byte], + ip6: array[16, byte], + tcp4Port: Opt[Port] = Opt.none(Port), + udp4Port: Opt[Port] = Opt.none(Port), + tcp6Port: Opt[Port] = Opt.none(Port), + udp6Port: Opt[Port] = Opt.none(Port), + extraFields: openArray[FieldPair] = [] +): EnrResult[T] = + ## Initialize a `Record` with given sequence number, private key, IPv4 and IPv6 + ## address, optional TCP port and UDP port for both IPv4 and IPV6, and + ## optional custom k:v pairs. + ## + ## This function is to be used when running in IPv4 and IPv6 dual stack mode. + ## The tcp6 and udp6 fields will only be set if they differ from the tcp and udp + ## fields. + ## + ## Can fail in case the record exceeds the `maxEnrSize`. + doAssert(not hasPredefinedKey(extraFields), "Predefined key in custom pairs") + + var fields = newSeq[FieldPair]() + + fields.insert(("ip", ip4.toField)) + fields.insert(("ip6", ip6.toField)) + + if tcp4Port.isSome(): + fields.insert(("tcp", tcp4Port.value().uint16.toField)) + if udp4Port.isSome(): + fields.insert(("udp", udp4Port.value().uint16.toField)) + + # From the ENR specification: + # "Declaring the same port number in both tcp, tcp6 or udp, udp6 should be avoided + # but doesn't render the record invalid." + if tcp6Port.isSome(): + if tcp6Port != tcp4Port: + fields.insert(("tcp6", tcp6Port.value().uint16.toField)) + if udp6Port.isSome(): + if udp6Port != udp4Port: + fields.insert(("udp6", udp6Port.value().uint16.toField)) + + fields.add extraFields + makeEnrAux(seqNum, "v4", pk, extraFields) + func getField(r: Record, name: string, field: var Field): bool = # It might be more correct to do binary search, # as the fields are sorted, but it's unlikely to @@ -357,6 +404,73 @@ func update*( ok() +func update*( + record: var Record, + pk: PrivateKey, + ip4: array[4, byte], + ip6: array[16, byte], + tcp4Port: Opt[Port] = Opt.none(Port), + udp4Port: Opt[Port] = Opt.none(Port), + tcp6Port: Opt[Port] = Opt.none(Port), + udp6Port: Opt[Port] = Opt.none(Port), + extraFields: openArray[FieldPair] = []): + EnrResult[void] = + ## Update a `Record` with given IPv4 and IPv6 address, optional TCP port and + ## UDP port for both IPv4 and IPV6, and optional custom k:v pairs. + ## + ## This function is to be used when running in IPv4 and IPv6 dual stack mode. + ## The tcp6 and udp6 fields will only be set if they differ from the tcp and udp + ## fields. + ## + ## If none of the k:v pairs are changed, the sequence number of the `Record` + ## will still be incremented and a new signature will be applied. + ## + ## Providing an `Opt.none` for `tcp4Port`/`udp4Port`/`tcp6Port`/`udp6Port`/ + ## will leave the corresponding field untouched. + ## + ## Can fail in case of wrong `PrivateKey`, if the size of the resulting record + ## exceeds `maxEnrSize` or if maximum sequence number is reached. The `Record` + ## will not be altered in these cases. + # TODO: deprecate this call and have individual functions for updating? + doAssert(not hasPredefinedKey(extraFields), "Predefined key in custom pairs") + + var r = record + + let pubkey = r.get(PublicKey) + if pubkey.isNone() or pubkey.get() != pk.toPublicKey(): + return err("Public key does not correspond with given private key") + + var fields = newSeq[FieldPair]() + + fields.insert(("ip", ip4.toField)) + fields.insert(("ip6", ip6.toField)) + + if tcp4Port.isSome(): + fields.insert(("tcp", tcp4Port.value().uint16.toField)) + if udp4Port.isSome(): + fields.insert(("udp", udp4Port.value().uint16.toField)) + + # From the ENR specification: + # "Declaring the same port number in both tcp, tcp6 or udp, udp6 should be avoided + # but doesn't render the record invalid." + if tcp6Port.isSome(): + if tcp6Port != tcp4Port: + fields.insert(("tcp6", tcp6Port.value().uint16.toField)) + if udp6Port.isSome(): + if udp6Port != udp4Port: + fields.insert(("udp6", udp6Port.value().uint16.toField)) + + r.pairs.insert extraFields + + if r.seqNum == high(type r.seqNum): # highly unlikely + return err("Maximum sequence number reached") + r.seqNum.inc() + + r.raw = ? makeEnrRaw(r.seqNum, pk, r.pairs) + record = r + + ok() + func tryGet*(r: Record, key: string, T: type): Opt[T] = ## Get the value from the provided key. ## Return `none` if the key does not exist or if the value is invalid