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//
// RelaySelectorPicker.swift
// MullvadREST
//
// Created by Jon Petersson on 2024-06-05.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import MullvadSettings
import MullvadTypes
import Network
protocol RelayPicking {
var obfuscation: RelayObfuscation { get }
var tunnelSettings: LatestTunnelSettings { get }
var connectionAttemptCount: UInt { get }
func pick() throws -> SelectedRelays
}
extension RelayPicking {
func findBestMatch(
from candidates: [RelayWithLocation<REST.ServerRelay>],
closeTo location: Location? = nil,
applyObfuscatedIps: Bool
) throws -> SelectedRelay {
let match = try RelaySelector.WireGuard.pickCandidate(
from: candidates,
wireguard: obfuscation.allRelays.wireguard,
portConstraint: applyObfuscatedIps
? obfuscation.port
: tunnelSettings.relayConstraints.port,
numberOfFailedAttempts: connectionAttemptCount,
closeTo: location
)
return SelectedRelay(
endpoint: match.endpoint.override(
ipv4Relay: IPv4Endpoint(
ip: applyObfuscatedIps
? applyObfuscatedIpAddresses(match: match)
: match.endpoint.ipv4Relay.ip,
port: match.endpoint.ipv4Relay.port
)),
hostname: match.relay.hostname,
location: match.location,
features: match.relay.features
)
}
private func applyObfuscatedIpAddresses(match: RelaySelectorMatch) -> IPv4Address {
switch obfuscation.method {
case .shadowsocks:
applyShadowsocksIpAddress(in: match)
case .quic:
applyQuicIpAddress(in: match)
case .off, .automatic, .on, .udpOverTcp:
match.endpoint.ipv4Relay.ip
}
}
private func applyQuicIpAddress(in match: RelaySelectorMatch) -> IPv4Address {
let defaultIpv4Address = match.endpoint.ipv4Relay.ip
return match.relay.features?.quic?.addrIn.compactMap({ IPv4Address($0) }).randomElement() ?? defaultIpv4Address
}
private func applyShadowsocksIpAddress(in match: RelaySelectorMatch) -> IPv4Address {
let defaultIpv4Address = match.endpoint.ipv4Relay.ip
let extraAddresses = match.relay.shadowsocksExtraAddrIn?.compactMap({ IPv4Address($0) }) ?? []
// If the currently selected obfuscation port is not within the allowed range (as specified
// in the relay list), we should use only one of the extra Shadowsocks IPs instead of the
// default one.
return if !shadowsocksPortIsWithinRange(match.endpoint.ipv4Relay.port) {
extraAddresses.randomElement() ?? defaultIpv4Address
} else {
// If the currently selected obfuscation port is within the allowed range we select from
// a mix of extra addresses and the default IP.
// Safe to unwrap since array is never empty.
(extraAddresses + [defaultIpv4Address]).randomElement().unsafelyUnwrapped
}
}
private func shadowsocksPortIsWithinRange(_ port: UInt16) -> Bool {
let portRanges = RelaySelector.parseRawPortRanges(obfuscation.allRelays.wireguard.shadowsocksPortRanges)
return portRanges.contains(where: { $0.contains(port) })
}
}
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