nim-eth/eth/net/utils.nim

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# nim-eth
# Copyright (c) 2020-2021 Status Research & Development GmbH
# Licensed and distributed under either of
# * MIT license (license terms in the root directory or at https://opensource.org/licenses/MIT).
# * Apache v2 license (license terms in the root directory or at https://www.apache.org/licenses/LICENSE-2.0).
# at your option. This file may not be copied, modified, or distributed except according to those terms.
{.push raises: [Defect].}
import
std/[tables, hashes],
stew/results, stew/shims/net as stewNet, chronos, chronicles
type
IpLimits* = object
limit*: uint
ips: Table[ValidIpAddress, uint]
func hash(ip: ValidIpAddress): Hash =
case ip.family
of IpAddressFamily.IPv6: hash(ip.address_v6)
of IpAddressFamily.IPv4: hash(ip.address_v4)
func inc*(ipLimits: var IpLimits, ip: ValidIpAddress): bool =
let val = ipLimits.ips.getOrDefault(ip, 0)
if val < ipLimits.limit:
ipLimits.ips[ip] = val + 1
true
else:
false
func dec*(ipLimits: var IpLimits, ip: ValidIpAddress) =
let val = ipLimits.ips.getOrDefault(ip, 0)
if val == 1:
ipLimits.ips.del(ip)
elif val > 1:
ipLimits.ips[ip] = val - 1
func isPublic*(address: TransportAddress): bool =
# TODO: Some are still missing, for special reserved addresses see:
# https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml
# https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml
if address.isLoopback() or address.isSiteLocal() or
address.isMulticast() or address.isLinkLocal():
false
else:
true
func isPublic*(address: IpAddress): bool =
let a = initTAddress(address, Port(0))
a.isPublic
proc getRouteIpv4*(): Result[ValidIpAddress, cstring] =
# Avoiding Exception with initTAddress and can't make it work with static.
# Note: `publicAddress` is only used an "example" IP to find the best route,
# no data is send over the network to this IP!
let
publicAddress = TransportAddress(family: AddressFamily.IPv4,
address_v4: [1'u8, 1, 1, 1], port: Port(0))
route = getBestRoute(publicAddress)
if route.source.isUnspecified():
err("No best ipv4 route found")
else:
let ip = try: route.source.address()
except ValueError as e:
# This should not occur really.
error "Address convertion error", exception = e.name, msg = e.msg
return err("Invalid IP address")
ok(ValidIpAddress.init(ip))