Skaty

Introducing Skaty, the Kotlin port for Scapy. Skaty is a POC therefore it lacks many important features. Do not use on production!

import com.yoavst.skaty.protocols.*
import com.yoavst.skaty.network.Network.*

fun showcase() {
    val packet = Ether() / IP(dst = ip("192.168.1.1"), options = optionsOf(IPOption.MTUProb(22.us))) / 
        UDP(sport = 7000.us, dport = 7000.us) / "Hello world"
    
    // work with properties
    packet.dst = mac("AA-BB-CC-DD-EE-FF")
    del(packet::dst)
    println(packet)
        
    // get a layer
    val tcp = packet[UDP]
    println(tcp.dport)
    println(TCP in packet)
    
    // send packet
    sendp(packet)
    
    // sniff packets
    val packets = sniff(timeout = 2000).filter { TCP in it && it[TCP].dport == 1200.us }.take(10).map { item -> item[TCP].ack }.toList()
    packets.forEach(::println)
}

Features

• Create Ether, IP, TCP, UDP or Raw packets programmatically.
• Create new protocols and integrate them with the existing framework
• Serialize data to byte array
• Deserialize raw data to protocols using extensible deserializer.
• Read pcap files
• Send packets and sniff incoming packets
• Sending and sniffing uses pcap4j and not self implementation
• More protocols are needed
• Serialization model need to be changed

Initialization

Currently, in order to initialize the library, you have to call Network.init(String) with the IP address of the network interface.

init("192.168.1.5")

This call will make a daemon process. In order to close it, use Network.close().

Create packet

Just do the same as you would have done in scapy.

Note: The library use kotlin-unsigned, so you need to postfix your numbers with .ub, .us, .ui or .ul.

 TCP(dport = 80.us, sport = 1200.us, flags = flagsOf(SYN, ACK), options = optionsOf(TCPOption.NOP, TCPOption.Timestamp(1489416311.ui, 1.ui)))

Use flagsOf(varargs Flag) for flags and optionsOf(vararg Option) for options. mac(String) and ip(String) provide easy way to use MAC & IP addresses.

Send packet

Same as scapy. Note: sr1 and srp1 are not available yet

sendp(etherPacket)
send(ipPacket)

Read pcap file

val sniff = pcapOf("sample.pcap")
sniff.filter { it.time > 50 && UDP in it && it[UDP].dport == 53 }.forEach(::println)

Sniffing

val packets = sniff(timeout = 2000).filter { TCP in it && it[TCP].dport == 1200.us }.take(10).toList()

License

Copyright 2017 Yoav Sternberg

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.