sharpshooter

Sharpshooter

Sharpshooter is a reliability network protocol using UDP.

It is a connection-oriented protocol just like TCP.

It doesn't have packet characteristics,You can try it to bypassing some protocol characteristics detection,and base for P2P application transport protocol.

About instructions , you can see example dir, I provided tow simple example.

If want TCP to sharpshooter convert , can try https://github.com/soyum2222/sharpshooter-tunel .

Specification

| SIZE(4byte) | SQE(4byte) | CMD(2byte) | CONTENT(.......) |

SIZE:
    contain SQE CMD CONTENT byte size . but not contain itself byte size .
    
SQE
    sequence number, continuous data package, SQE is continuous.
    
CMD
    0:ack
    1:NORMAL
    2:first handshack
    3:second handshack(response first handshack)
    4:third handshack
    5:close connction(FIN)
    6:response close
    7:health check
    8:response health 
       
ACK package
    
| SIZE(4byte) | SQE(4byte) | CMD(2byte) | ackSQE1(4byte)| ackSQE2(4byte) | ackSQE3(4byte) | ... |
    
The package max length can't over DEFAULT_INIT_PACKSIZE or Sniper.packageSize      

When receive ack like :

    | SIZE(4byte) | SQE(4byte) | CMD(2byte) | ackSQE1(4byte)| ackSQE2(4byte) | ackSQE3(4byte) |
    
if ackSQE1 == ackSQE2 and ackSQE1 < ackSQE3 this situation means ackSQE1 to ackSQE3 is continuous number .

eg:  receive data : |0|0|0|1|1|10| , this means other party sent ack 1 to 10.

Use

Ping pong

ping.go

pong.go

File transfer

send_file.go

receive_file.go

Network utilization

try transfer 100M file

utilization depends on network status and send window size