User Profile

i'd like to set up an app proxy server at local to resolve contents in mail protocols with SSL/TLS. using VPN(App Proxy Provider only support HTTP?) to tunnel flows about mail protocols to proxy server seems impracticable system configuration only supports HTTP and FTP? is there a way to set a Mail Protocols Proxy at system Level? or is there a way to route all transport layer flows(not only particular Application layer protocol) to proxy server?

hi,all readBytes: An NSData object containing the data to filter. For non-UDP/TCP flows, since the data may optionally include the IP header, readBytes includes a 4-byte NEFilterDataAttribute field preceding the user data. Your handler must examine the NEFilterDataAttribute field and handle the data accordingly. the param above in method handleInboundDataFromFlow:readBytesStartOffset:readBytes: i assume it contains a 4-byte NEFilterDataAttribute field preceding the user data all the time, is it normal that i get a NEFilterDataAttribute: 1099782776645(and some other very big number) const NEFilterDataAttribute* dataAttr = readBytes.bytes; NSLog(@"NEFilterDataAttribute: %ld",*dataAttr); and after the initial 4 bytes, if the offset param is 0, can i assume that UDP/TCP or IP packet headers can be extracted from the data?

new to Apple, MacOS, SystemExtensions. I don't see anything about my topic in system extensions documentation. should I use XPC? or we have a better way here?