122 lines
4.9 KiB
Ruby
Executable File
122 lines
4.9 KiB
Ruby
Executable File
#!/usr/bin/env ruby
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# Copyright (C) 2007 Sylvain SARMEJEANNE
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; version 2.
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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module Scruby
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# General help
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def help(command = nil)
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if command.nil?
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print <<EOF
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This is Scruby, a portable, customizable packet creation and sending/sniffing tool written in Ruby. It was tested on NetBSD, GNU/Linux and MacOS X, and should theoretically work on some other platforms such as FreeBSD, OpenBSD and proprietary Unixes.
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See http://sylv1.tuxfamily.org/projects/scruby.html for more information.
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With Scruby, you can:
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- create custom packet: p=IP(:src=>"1.2.3.4", :dst=>"www.google.com")/TCP()/"GET / HTTP 1.0\\r\\n\\r\\n"
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- send custom packets at layer 2: sendp(Ether(:src=>"00:11:22:33:44:55")/p)
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- sniff on an interface: sniff(:iface=>"eth1")
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- read packets from a PCAP file: sniff(:offline=>"mycapture.pcap")
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- dissect a string to a recreate the packet: s=p.to_net;puts "string=\#{s.inspect}\\nresult=\#{IP(s)}"
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Available dissectors (type "ls 'MyDissector'" to have detailed information):
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#{Scruby.dissectors.keys.sort.join(", ")}
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Available functions (type "lsc 'myfunction'" to have detailed information):
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#{(Scruby.methods - Object.methods).sort.join(", ")}
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EOF
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else
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# Executing the specific help function
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eval(command.to_s + '_help')
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end
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end
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# Help on sniff
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def sniff_help
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print <<EOF
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This function captures packets on an interface or reads a PCAP file. The default capture interface is stored in @conf.iface, currently "#{@conf.iface}".
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Without any argument, sniff captures on the default interface:
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example> sniff
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listening on eth0
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1158608918.45960 <Ether dst=00:11:22:33:44:55 src=55:44:33:22:11:00 |><IP len=84 proto=1 chksum=0x7c0f src=1.2.3.4 dst=4.3.2.1 |><ICMP chksum=17905 id=16922 seq=1 |>
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1158608918.124147 <Ether dst=55:44:33:22:11:00 src=00:11:22:33:44:55 |><IP len=84 ttl=244 proto=1 chksum=0xc80e src=4.3.2.1 dst=1.2.3.4 |><ICMP type=0 chksum=19953 id=16922 seq=1 |>
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The following arguments are available (with the default values between brackets):
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- iface: the interface to listen on (@conf.iface, currently "#{@conf.iface}")
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- prn: a function that will be called for each packet received (:sniff_simple)
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- filter: a PCAP filter (undef)
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- count: the number of packets to capture. An argument less than or equal to 0 will read "loop forever" (-1)
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- promisc: capture in promiscuous mode or not (@conf.promisc, currently "#{@conf.promisc}")
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- timeout: capture timeout in milliseconds (#{TIMEOUT}, seems not to work?)
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- offline: PCAP file to read packets from
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- store: not implemented yet
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The prn argument is the most interesting one, it allows you to customize the behaviour of the sniff function:
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example> def my_prn(pcap, packet) puts "GOT ONE: raw=|\#{packet.inspect}|" end
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example> sniff(:iface=>"eth1", :prn=>:my_prn, :filter=>"icmp", :count=>2)
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listening on eth0
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GOT ONE: raw=|"\000\a\313\fg\246\000Pp4\210\264\b\000E\000\000T\000\000@\000@\001\030KR\357\313I\324\e0\n\b\000\336\t4\031\000\001\001\202\252ED\021\v\000\b\t\n\v\f\r\016\017\020\021\022\023\024\025\026\027\030\031\032\e\034\035\036\037 !\"\#$%&'()*+,-./01234567"|
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Note that by default, captured packets are not stored in memory for performance reason. To stop sniffing, press ^C.
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To read from a PCAP file:
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example> sniff(:offline=>"mycapture.pcap")
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EOF
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end
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# Help on send
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def send_help
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print <<EOF
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NOT IMPLEMENTED YET
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This function sends a packet at layer 3 on the default interface (@conf.iface, currently "#{@conf.iface}"). If not specified, the Ethernet destination is @conf.gateway_hwaddr (currently "#{@conf.gateway_hwaddr}".
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If Libdnet is available, source IP address is automatically filled according to this interface.
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example> p=IP(:src=>"1.2.3.4", :dst=>"www.google.com")/TCP()/"GET / HTTP 1.0\\r\\n\\r\\n"
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example> send(p)
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Sent.
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EOF
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end
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# Help on sendp
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def sendp_help
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print <<EOF
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This function sends a packet at layer 2 on the default interface (@conf.iface, currently "#{@conf.iface}"). If not specified, the Ethernet destination will be @conf.gateway_hwaddr (currently "#{@conf.gateway_hwaddr}").
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If Libdnet is available, source Ethernet address and source IP address are automatically filled according to this interface.
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example> p=Ether(:src=>"00:11:22:33:44:55")/IP(:src=>"1.2.3.4", :dst=>"www.google.com")/TCP()/"GET / HTTP 1.0\\r\\n\\r\\n"
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example> sendp(p)
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Sent on eth0.
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EOF
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end
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# Help on ls
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def Scruby.ls_help
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print <<EOF
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This function lists the available dissectors. Type "ls 'MyDissector'" to have detailed information on one of them.
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EOF
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end
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# Help on lsc
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def Scruby.lsc_help
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print <<EOF
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Yeah, you've found an Easter Egg!!
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EOF
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end
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end
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