Do any of the APIs available in PHP allow me to read from a TCP socket the TCP state machine’s current sequence number?
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Do any of the APIs available in PHP allow me to read from a TCP socket the TCP state machine’s current sequence number?
(AFAIK) No.
This would require access to the TCP header, which none of the sockets-based extensions (sockets or streams) will provide access to.
SOCK_STREAMonly provides the data payload, it does not (again, AFAIK) allow you get any information about the low level internal workings of the stream – because, in theory, you shouldn’t need to worry about it.It may (?) be possible to implement a TCP stream using
SOCK_RAW, in which case you could probably get access to this information, but I’m not even 100% confident about that, and you can be certain that even if it is, it would not be worth the bother.Having said all of that – depending on how good your lower level coding skills are, you may be able to build a PHP extension to interface with libpcap. You also might be able to do something by
exec()ing tcpdump, as long as it is available on the host system – although equally, I sort of doubt it, I suspect this would be very difficult if even possible to implement in a language that does not support multi-threading. Either of these options would require examining the payloads of packets and comparing them with what you had sent from PHP to sync up the data with the SEQ numbers.