Dhammer is a stress-tester for DHCP servers. It currently only supports DHCPv4, but it was created with the strong intention of including DHCPv6 in the very near future.
Please, read the full disclaimer at the bottom of this document.
This tool is meant for testing YOUR OWN networks and servers. I wrote this with the intention of using it to stress-test a DHCP framework I have in development and to aid in the addition of DHCPv6 features to the framework. Thus, Dhammer is meant to be used as a diagnostic tool, and it should not be used for malicious activity.
Dhammer can act as a "local" DHCP client broadcasting packets, or it can simulate a DHCP relay, allowing you to test DHCP servers outside of your local network and also to avoid any potential broadcast-storm safeguards your router might have.
It's also possible to have dhammer bind any assigned IPs to the loopback and handle ARP requests, including responding to ARPs with a generated MAC address instead of the actual MAC of the interface sending the original DHCP requests.
Just download, compile, and run.
go get -u github.com/nsone/dhammer
go build .
sudo ./dhammer dhcpv4 --interface wlan1 --mac-count 10000 --rps 100 --maxlife 0
Use the flag --hostname to send the client's host name (option 12). The format's host name is: host-<mac> e.g. host-0242b4bd98ae
sudo ./dhammer dhcpv4 --interface wlan1 --mac-count 10000 --rps 100 --maxlife 0 --hostname
Use the flag --fqdn to send the client's FQDN (Fully Qualified Domain Name) (option 81). The format's FQDN is: host-<mac>.mydomain.com e.g. host-0242b4bd98ae.mydomain.com
sudo ./dhammer dhcpv4 --interface wlan1 --mac-count 10000 --rps 100 --maxlife 0 --fqdn mydomain.com
sudo ./dhammer dhcpv4 --interface wlan1 --mac-count 10000 --gateway-mac "48:f8:b6:f7:30:28" --rps 1000 --maxlife 0 --relay-target-server-ip 192.168.1.1 --relay-source-ip 192.168.1.143
To use the relay, particularly if you'll be attempting to test a server across the WAN, you'll need the MAC of your gateway. However, if you omit the --gateway-mac option, dhammer will attempt to find your default route and ARP for the MAC address.
Dhammer uses very raw sockets to do its job, so CAP_NET_ADMIN (for binding) and CAP_NET_RAW are needed at the very least. I.e., just sudo and get moving.
Stats are now accessible via API calls with JSON responses. An example python script to interact with them is included in the repo.
Example response from http://localhost:8080/stats:
[
{
"stat_name": "DiscoverSent",
"stat_value": 1066,
"stat_previous_ticker_value": 975,
"stat_rate_per_second": 65
},
{
"stat_name": "InfoSent",
"stat_value": 0,
"stat_previous_ticker_value": 0,
"stat_rate_per_second": 0
},
{
"stat_name": "RequestSent",
"stat_value": 933,
"stat_previous_ticker_value": 846,
"stat_rate_per_second": 63.333333333333336
},
{
"stat_name": "DeclineSent",
"stat_value": 0,
"stat_previous_ticker_value": 0,
"stat_rate_per_second": 0
},
{
"stat_name": "ReleaseSent",
"stat_value": 0,
"stat_previous_ticker_value": 0,
"stat_rate_per_second": 0
},
{
"stat_name": "OfferReceived",
"stat_value": 933,
"stat_previous_ticker_value": 846,
"stat_rate_per_second": 63.333333333333336
},
{
"stat_name": "AckReceived",
"stat_value": 882,
"stat_previous_ticker_value": 802,
"stat_rate_per_second": 61
},
{
"stat_name": "NakReceived",
"stat_value": 0,
"stat_previous_ticker_value": 0,
"stat_rate_per_second": 0
}
]
Contributions are welcome. In particular, help me make the stats better! :D
This project is licensed under the Apache v2.0 License - see the LICENSE file for details
BY USING AND/OR UTILIZING THE CODE FROM THIS REPOSITORY IN ANY FORM, COMPILED BINARY FORM OR OTHERWISE, YOU HEREBY ASSUME ALL OF THE RISK IN ANY AND ALL ACTIVITIES ASSOCIATED WITH ANY USE, including by way of example and not limitation, any risks that may arise from negligence or carelessness on the part of any persons or entities making use of the content of this repository for any purpose.
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( A ) YOU WILL NOT use the content of this repository in any form, compiled or otherwise, for malicious activity.
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