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Fix VPN detection and client IP address on iOS #174

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Merged
enahum merged 1 commit into from
Sep 30, 2026
Merged

Fix VPN detection and client IP address on iOS #174

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30 changes: 25 additions & 5 deletions ios/SessionAttributes/SessionAttributesCollector.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -195,13 +195,31 @@ public class SessionAttributesCollector: NSObject {
}
defer { freeifaddrs(interfaces) }

let activeFlags = UInt32(IFF_UP | IFF_RUNNING)
var ptr = first
while true {
let name = String(cString: ptr.pointee.ifa_name)
if name.hasPrefix("utun") || name.hasPrefix("ipsec") || name.hasPrefix("ppp") {
return true
let interface = ptr.pointee
let name = String(cString: interface.ifa_name)
if name.hasPrefix("utun") || name.hasPrefix("ipsec") || name.hasPrefix("ppp"),
interface.ifa_flags & activeFlags == activeFlags,
let ifaAddr = interface.ifa_addr {
switch Int32(ifaAddr.pointee.sa_family) {
case AF_INET:
return true
case AF_INET6:
let bytes = ifaAddr.withMemoryRebound(to: sockaddr_in6.self, capacity: 1) {
$0.pointee.sin6_addr.__u6_addr.__u6_addr8
}
// iOS keeps its own system tunnels up with only a link-local (fe80::/10) address
let isLinkLocal = bytes.0 == 0xfe && bytes.1 & 0xc0 == 0x80
if !isLinkLocal {
return true
}
default:
break
}
}
guard let next = ptr.pointee.ifa_next else {
guard let next = interface.ifa_next else {
break
}
ptr = next
Expand All @@ -223,7 +241,9 @@ public class SessionAttributesCollector: NSObject {
if let ifaAddr = interface.ifa_addr, ifaAddr.pointee.sa_family == UInt8(AF_INET) {
let name = String(cString: interface.ifa_name)
if name == "en0" || name == "en1" {
var addr = ifaAddr.pointee
var addr = ifaAddr.withMemoryRebound(to: sockaddr_in.self, capacity: 1) {
$0.pointee.sin_addr
}
var buffer = [CChar](repeating: 0, count: Int(INET_ADDRSTRLEN))
inet_ntop(AF_INET, &addr, &buffer, socklen_t(INET_ADDRSTRLEN))
let ip = String(cString: buffer)
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