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exdhcp's Introduction

exdhcp

DHCP lease exhausting test tool

Usage

  1. determine the target interface
$ ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
13: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default 
    link/ether 02:42:ac:11:00:02 brd ff:ff:ff:ff:ff:ff link-netnsid 0
    inet 172.17.0.2/16 brd 172.17.255.255 scope global eth0
       valid_lft forever preferred_lft forever
  1. Run

  • 10 times (default)

    $ sudo ./exdhcp -if eth0

    CSV result file will be saved.

  • n times

    $ sudo ./exdhcp -if eth0 -num 100

  • run until lease exhausts

    $ sudo ./exdhcp -if eth0 -num 0

Options

$ ./exdhcp -help
Usage of ./exdhcp:
  -csv
        Export leases to CSV file (default true)
  -if string
        Interface name
  -num int
        Number of tries. Set 0 to do exhaustion attack. (default 10)
  -release
        Release DHCP lease (default true)
  -server string
        DHCP server IP
  -timeout int
        Timeout seconds to wait DHCP offer (default 10)
  -verbose
        Print debug logs

Build

$ go build ./cmd/dhcpcd/dhcpcd.go

v1 milestone

  • support Windows (use pcap)

Reference

https://support.huawei.com/enterprise/en/doc/EDOC1100055047/c8e6549d/dhcp-dos-attack-by-changing-chaddr

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