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//
// ShadowsocksObfuscator.swift
// MullvadVPN
//
// Created by Jon Petersson on 2025-09-04.
// Copyright © 2025 Mullvad VPN AB. All rights reserved.
//
import MullvadSettings
import MullvadTypes
struct ShadowsocksObfuscator: RelayObfuscating {
let relays: REST.ServerRelaysResponse
let tunnelSettings: LatestTunnelSettings
let connectionAttemptCount: UInt
func obfuscate() -> RelayObfuscation {
RelayObfuscation(
allRelays: relays,
obfuscatedRelays: filterShadowsocksRelays(
from: relays,
for: tunnelSettings.wireGuardObfuscation.shadowsocksPort
),
port: obfuscateShadowsocksPort(
tunnelSettings: tunnelSettings,
shadowsocksPortRanges: relays.wireguard.shadowsocksPortRanges
),
method: .shadowsocks
)
}
private func filterShadowsocksRelays(
from relays: REST.ServerRelaysResponse,
for port: WireGuardObfuscationShadowsocksPort
) -> REST.ServerRelaysResponse {
let portRanges = RelaySelector.parseRawPortRanges(relays.wireguard.shadowsocksPortRanges)
// If the selected port is within the shadowsocks port ranges we can select from all relays.
guard
case let .custom(port) = port,
!portRanges.contains(where: { $0.contains(port) })
else {
return relays
}
let filteredRelays = relays.wireguard.relays.filter { relay in
relay.shadowsocksExtraAddrIn != nil
}
return REST.ServerRelaysResponse(
locations: relays.locations,
wireguard: REST.ServerWireguardTunnels(
ipv4Gateway: relays.wireguard.ipv4Gateway,
ipv6Gateway: relays.wireguard.ipv6Gateway,
portRanges: relays.wireguard.portRanges,
relays: filteredRelays,
shadowsocksPortRanges: relays.wireguard.shadowsocksPortRanges
),
bridge: relays.bridge
)
}
private func obfuscateShadowsocksPort(
tunnelSettings: LatestTunnelSettings,
shadowsocksPortRanges: [[UInt16]]
) -> RelayConstraint<UInt16> {
let wireGuardObfuscation = tunnelSettings.wireGuardObfuscation
let shadowsockPort: () -> UInt16? = {
switch wireGuardObfuscation.shadowsocksPort {
case let .custom(port):
port
default:
RelaySelector.pickRandomPort(rawPortRanges: shadowsocksPortRanges)
}
}
guard let port = shadowsockPort() else {
return tunnelSettings.relayConstraints.port
}
return .only(port)
}
}
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