The qDHCPv4 server

qDHCPv4 is DHCPv4 server for public places that use unmanaged switches.

Features

Dynamically assigned lease time based on schedule (time points when all users must free or extend their lease). Useful for preventing exhaustion of free leases on public places.
User Classes / Subnets based on Host Name (DHCP Option #12).

< sarcasm /> :-)

Full High Super+ Speed (as USB). Generate 41 Mbps offer / ACK flood by incoming 74 Mbps Discover / Request flood.
Goes beyond the RFC scope. You can see clear logic in one of first commits.
Need only 34 GiB virtual memory to run (on 64bit systems).
Doesn't require permanent data storage.
Code-style: JavaScript <-> Go <-> C.

Usage

For Windows 64bit download, unpack and run:

qDHCPv4.exe -conf=<path to config.json>

For other systems: compile binary go get go build.

Documentation

LeaseEndTime scheduler logic

LeaseEndTime 3 user example

Config file

See example_config.json.

globalOptions

Transmitted options to DHCP client. List of all options and descriptions: dhcpd options, DHCP and BOOTP parameters, dhcpd options RU, DHCP options in JSON. Example:

"globalOptions":{
	"ServerIdentifier": "194.188.64.28",
	"SubnetMask": "255.255.0.0",
	"Router": ["194.188.64.8"],
	"DomainNameServer": ["194.188.64.8"]
	}

leaseEndTime

Time when all clients must renew the lease. Format hh:mm. Example:

"leaseEndTime":[
	"11:35",
    "12:50",
    "17:23"
]

devices

Define user Classes / Subnets based on first two chars from Host Name (DHCP Option #12). Parameters:

name - first two chars from Host Name (android-a70378b9bf61c919 -> an; iPhone-Jon, iPad-Jon -> iP; Windows-Phone -> Wi)
startIP - first client IP in this scope (Class / Subnet)
rangeIP - count of all IP's in this scope (Class / Subnet) Example:

"devices":[
	{"name": "an", "startIP": "194.188.36.1", "rangeIP": 1024},
    {"name": "iP", "startIP": "194.188.40.1", "rangeIP": 1024},
    {"name": "Wi", "startIP": "194.188.44.1", "rangeIP": 1024}
]

defaultDevice

startIP and rangeIP for all other devices.

"defaultDevice":{"startIP": "194.188.32.1", "rangeIP": 1024}

ZiroKyl / qDHCPv4