mirror of https://github.com/waku-org/nwaku.git
60 lines
1.8 KiB
Nim
60 lines
1.8 KiB
Nim
when (NimMajor, NimMinor) < (1, 4):
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{.push raises: [Defect].}
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else:
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{.push raises: [].}
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import std/[options, strutils, net]
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import chronicles, eth/net/nat, stew/results, nativesockets
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logScope:
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topics = "nat"
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proc setupNat*(
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natConf, clientId: string, tcpPort, udpPort: Port
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): Result[
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tuple[ip: Option[IpAddress], tcpPort: Option[Port], udpPort: Option[Port]], string
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] {.gcsafe.} =
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let strategy =
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case natConf.toLowerAscii()
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of "any": NatAny
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of "none": NatNone
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of "upnp": NatUpnp
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of "pmp": NatPmp
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else: NatNone
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var endpoint:
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tuple[ip: Option[IpAddress], tcpPort: Option[Port], udpPort: Option[Port]]
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if strategy != NatNone:
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let extIp = getExternalIP(strategy)
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if extIP.isSome():
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endpoint.ip = some(extIp.get())
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# RedirectPorts in considered a gcsafety violation
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# because it obtains the address of a non-gcsafe proc?
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var extPorts: Option[(Port, Port)]
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try:
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extPorts = (
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{.gcsafe.}:
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redirectPorts(tcpPort = tcpPort, udpPort = udpPort, description = clientId)
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)
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except CatchableError:
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# TODO: nat.nim Error: can raise an unlisted exception: Exception. Isolate here for now.
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error "unable to determine external ports"
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extPorts = none((Port, Port))
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if extPorts.isSome():
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let (extTcpPort, extUdpPort) = extPorts.get()
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endpoint.tcpPort = some(extTcpPort)
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endpoint.udpPort = some(extUdpPort)
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else: # NatNone
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if not natConf.startsWith("extip:"):
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return err("not a valid NAT mechanism: " & $natConf)
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try:
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# any required port redirection is assumed to be done by hand
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endpoint.ip = some(parseIpAddress(natConf[6 ..^ 1]))
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except ValueError:
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return err("not a valid IP address: " & $natConf[6 ..^ 1])
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return ok(endpoint)
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