wrong solution behavior in unrelialbe handshake

[junhyeok-yoon]

Hello. I am trying to implement reliable data transfer regarding handshake(not yet for data trasfer).
I am pass most of the test(open, bind, handshake, close - unreliable).
But with the seed 9344135, the solution behavior is strange(especially handshake-unreliable, TestAccept_MultipleInterface1) as below.
Not only this seed, some other seeds has these behavior(such as 7628041...) But still "pass" the test
(It keeps retransmit the FINACK)

And my solution acts like the solution(which keep transmit the FINACK).
I cannot detect FINACK at packetArrived() fuction which means that the ACK should be sent from the solution.
How should I handle this problem?

[Pusnow]

It looks very strange behavior. Would you send your source code to TAs? [email protected]

Until I investigate this issue, you can ignore packets after packet No. 60. It seems all connections are closed well, and you passed all test cases.

[Pusnow]

It turns out your TCP implementation keeps retransmitting the packets in line 1623.
Please check your timerCallback implementation.

[junhyeok-yoon]

FINACK을 Retransmit하고 다시 ACK을 받아야하기 때문에, 다시 타이머를 설정해줍니다. 그래서 해당 ACK이 오면 line 1401에서 그 timer를 cancel해주는데, 그 ACK이 다시 안오는 것 같습니다

[Pusnow]

I've figured out it is a bug in KENS's TCP. I'm fixing it now, and let you know when it is fixed.

[Pusnow]

I've fixed and uploaded new solution files. Please rebuild and test your project from scratch (remove build/).

If you encounter a new problem due to the changes, you can revert to old files by changing version to 3.3.3 at below.

KENSv3/CMakeLists.txt

Line 3 in 5bf97d4

project(e VERSION 3.3.4)

[junhyeok-yoon]

Thank you very much! By updating the version, it works well!
I tested 10000 random seeds and pass all of unreliable handshake, close.

BTW, I wonder why only fixing the version to 3.3.4 can fixed the bug.(without any git pull) How is it possible?

[Pusnow]

It was bug in the solution binary, which is distributed separately via web.

[junhyeok-yoon]

I appreciate your kind help!