iOS NetworkExtension let tunFd = self?.packetFlow.value(forKeyPath: “socket.fileDescriptor“) as! Int

Posted 2021-07-04 ZH_CQ_iOS

ios进行VPN链接获取tunfd 

iOS15无法正常创建连接，14正常！

解决代码如下

if #available(iOS 15, *) {
var buf = [CChar](repeating: 0, count: Int(IFNAMSIZ))
let utunPrefix = "utun".utf8CString.dropLast()
return (0...1024).first { (_ fd: Int32) -> Bool in
var len = socklen_t(buf.count)
return getsockopt(fd, 2, 2, &buf, &len) == 0 && buf.starts(with: utunPrefix)
}
} else {
return self.packetFlow.value(forKeyPath: "socket.fileDescriptor") as? Int32
}