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Fix syn (#102)

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* Add unit test for TCP SYN replies
* Add functional test for TCP SYN+flag packets
* Fix bug: prevent anwsers to SYN+flag first packets
* Fix TCP behaviour to match Linux network stack
* Update the documentation according to the new behaviour for TCP SYN packets
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_Frky 2023-07-05 22:20:06 +02:00 • committed by GitHub
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README.md
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@ -217,7 +217,11 @@ code `0` and the same payload as the incoming packet, as specified by [RFC 792](
a supported protocol (Layer 5/6/7) has been detected,
* if the received packet has flag `ACK`, it is ignored,
* if the received packet has flag `RST` or `FIN-ACK`, it is ignored,
* if the received packet has flag `SYN`, then `masscanned` answers with a `SYN-ACK` packet, setting a **SYNACK-cookie** in the sequence number.
* if the received packet has flag `SYN`, then `masscanned` tries to imitate the behaviour
of a standard Linux stack - which is:
* if there are additional flags that are not among `PSH`, `URG`, `CWR`, `ECE`, then the `SYN` is ignored,
* if the flags `CWR` and`ECE` are simultaneously set, then the `SYN` is ignored,
* in any other case, `masscanned` answers with a `SYN-ACK` packet, setting a **SYNACK-cookie** in the sequence number.
#### UDP