Bash Script for Scapy

clapika · 01-17-2012, 08:10 PM

i'm try to make bash script for scapy.Below is my script

#!/bin/sh
scapy
a=IP(dst="192.168.0.111")/TCP(dport=(1,1024),flags="S")

Output:
Welcome to Scapy(2.2.0-dev)
>>>

it doesn't execute second line script.Please help me

Dark_Helmet · 01-17-2012, 09:08 PM

I don't use scapy, but I think I know what the problem is...

Quote:

Code:

#!/bin/sh
scapy
a=IP(dst="192.168.0.111")/TCP(dport=(1,1024),flags="S")

Scripting doesn't work that way. When your shell script encounters the line with "scapy," the shell runs scapy just as if you typed the command at the terminal. You will get the same interactive command prompt as usual.

If you want to automate entering commands into scapy then you should probably look at expect.

Some links to give you an idea:
LinuxJournal: Automating Tasks with EXPECT
The Geek Stuff: 6 Expect Script Examples to Expect the Unexpected (With Hello World)

clapika · 01-17-2012, 10:11 PM

New Code:

#!usr/bin/expect -f
spawn scapy
expect ">>> ";
send "a=IP(dst="192.168.0.111")/TCP(dport=(1,1024),flags="S")\r";

Output:
spawn: command not found

I ready install expect package.And still cant find "spawn: command not found" solution from google

Dark_Helmet · 01-17-2012, 10:25 PM

#1

Code:

#!usr/bin/expect -f

That statement is missing the leading slash for an absolute path. It should be:

Code:

#!/usr/bin/expect

#2

Code:

spawn scapy

I suggest you (a) put the executable to spawn in double quotes and (b) as shown in most of the examples, give an explicit path to scapy. For instance:

Code:

spawn "/usr/local/bin/scapy"

#3
Expect scripts do not need semicolons at the end of each line

#4

Code:

send "a=IP(dst="192.168.0.111")/TCP(dport=(1,1024),flags="S")\r";

You have a problem here. You are trying to use double quotes within the quotes used for the send command. You need to escape the internal double quotes. If you do not, expect may get confused as to what text should sent. For instance:

Code:

send "a=IP(dst=\"192.168.0.111\")/TCP(dport=(1,1024),flags=\"S\")\r"

EDIT:

#5
Your expect script will also need an 'interact' command or another 'expect "<something here>"' command after your send command. Without one of those, the expect script will terminate immediately after sending the string--which will probably cause the command you sent to have no effect.

clapika · 01-17-2012, 11:57 PM

This is my new script:

#!/usr/bin/expect
spawn "/usr/local/bin/scapy";
expect ">>> ";
send "a=IP(dst=\"192.168.0.111\")/TCP(dport=(1,1024),flags=\"S\");\r";
interact

Output:

ftp.sh: line 2: spawn: command not found
couldn't read file ">>> ": no such file or directory
ftp.sh: line 4: send: command not found
ftp.sh: line 5: interact: command not found

It's seem like the /usr/bin/except doesnt have command spawn,sen,interact

clapika · 01-18-2012, 12:23 AM

I solved already.I need to change the file to .exp not .sh
Thx ^.^