From: David Crawshaw <crawshaw@tailscale.com>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>
Cc: WireGuard mailing list <wireguard@lists.zx2c4.com>
Subject: Re: WireGuard is broken on iOS 15 beta
Date: Thu, 10 Jun 2021 15:33:53 -0700 [thread overview]
Message-ID: <CANdratux27RGAbVg1QBEKEnff8jb3pdezZ-Ad0=bqYfOw6iUeA@mail.gmail.com> (raw)
In-Reply-To: <CAHmME9rqAH9a28apwB9Rg1k9Lg1gmBWv3KK_8ZmAdb6H9hBaKQ@mail.gmail.com>
I finally managed to get a device running iPadOS 15 and an Xcode 13
beta. This technique works. Some modified code with logging:
func tunnelFD(provider: NEPacketTunnelProvider) -> Int32 {
os_log("tunnelFD searching")
var buf = [CChar](repeating: 0, count: Int(IFNAMSIZ))
for fd: Int32 in 4...64 {
var len = socklen_t(buf.count)
if getsockopt(fd, 2 /* SYSPROTO_CONTROL */, 2, &buf, &len) == 0 {
let str = String(cString: buf)
os_log("%{public}@", "tunnelFD \(fd): \(str)")
if str.starts(with: "utun") {
os_log("tunnelFD found likely fd")
return fd
}
}
}
os_log("tunnelFD found nothing")
return -1
}
produces the logs:
tunnelFD searching
tunnelFD 7: utun3
tunnelFD found likely fd
Note that the current technique of calling
provider.packetFlow.value(forKeyPath: "socket.fileDescriptor") causes
the NetworkExtension to crash under iOS 15. The logs say the kernel
sandbox killed it:
Sandbox: process(525) deny(2) file-test-existence /private/etc/.mdns_debug
On Thu, Jun 10, 2021 at 8:44 AM Jason A. Donenfeld <Jason@zx2c4.com> wrote:
>
> I won't have an updated OS to test this out in until next week at the
> earliest, but perhaps this hack will work?
> https://git.zx2c4.com/wireguard-apple/commit/?h=jd/fd-search-hack
> Let me know if that is successful, or if it blows up.
>
> Jason
next prev parent reply other threads:[~2021-06-10 22:53 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-10 11:44 WireGuard is broken on iOS 15 beta Andrej Mihajlov
2021-06-10 11:51 ` Jason A. Donenfeld
2021-06-10 15:39 ` Jason A. Donenfeld
2021-06-10 22:33 ` David Crawshaw [this message]
2021-06-11 7:16 ` Andrej Mihajlov
2021-06-11 7:53 ` Jason A. Donenfeld
2021-06-11 8:42 ` Andrej Mihajlov
2021-06-11 8:50 ` Jason A. Donenfeld
2021-06-11 9:02 ` Andrej Mihajlov
2021-06-11 9:09 ` Jason A. Donenfeld
2021-06-16 13:25 ` Andrej Mihajlov
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