How can I do a tcp syn portscan with golang

[Billy Shea]

I'm trying to write a tcp syn portscanner with golang, I found a solution in C version here: http://www.binarytides.com/tcp-syn-portscan-in-c-with-linux-sockets/

I'd like to implement it in go, how can I send a tcp header like this:

//TCP Header

    tcph->source = htons ( source_port );

    tcph->dest = htons (80);

    tcph->seq = htonl(1105024978);

    tcph->ack_seq = 0;

    tcph->doff = sizeof(struct tcphdr) / 4;      //Size of tcp header

    tcph->fin=0;

    tcph->syn=1;

    tcph->rst=0;

    tcph->psh=0;

    tcph->ack=0;

    tcph->urg=0;

    tcph->window = htons ( 14600 );  // maximum allowed window size

    tcph->check = 0; //if you set a checksum to zero, your kernel's IP stack should fill in the correct checksum during transmission

    tcph->urg_ptr = 0;

Do I have to use syscall or cgo? I'm really appreciated if someone could help me out.

[Alexandre Fiori]

I believe you have to use raw sockets:

http://godoc.org/code.google.com/p/go.net/ipv4#NewRawConn

[Billy Shea]

Thank you! I'll look into that package.

[Kevin D]

I decided to try to tackle this myself, and I was able to accomplish it. Here is my example I put up. Hope it helps!

https://github.com/kdar/gorawtcpsyn

[Billy Shea]

Wow, brilliant! I happened to find this gopacket, and was trying to do it myself, and you did it! Many many thanks!