• Jan Kalenda (xkalen07)
• 17.11.2023

The dhcp-stats is a monitor that monitors a DHCP server and observer specified subnets and their usage rate. When 50% is reached a system log is created warning the user about the situation.

./dhcp-stats [-h] [-i INTERFACE] [-r FILE] [ SUBNETS [SUBNETS ...]]

where:

• -h show this help message and exit
• -i INTERFACE interface to listen on
• -r FILE file to read from
• SUBNETS subnets to observe, format: IP/MASK

Only one of -i and -r can be used.

./dhcp-stats -i lo 192.168.0.0/22 192.168.1.0/24 172.16.32.0/24 192.168.1.0/26 192.168.1.0/27
IP-Prefix       Max-hosts       Allocated addresses     Utilization
192.168.0.0/22  1022            50                      4.89%
192.168.1.0/24  254             50                      19.69%
172.16.32.0/24  254             0                       0.00%
192.168.1.0/26  62              50                      80.65%
192.168.1.0/27  30              30                      100.00%

prefix 192.168.1.0/27 exceeded 50% of allocations
prefix 192.168.1.0/26 exceeded 50% of allocations

• -h argument is added
• support for Option Overload
• support for single layer of VLAN
• support for counting of allocated addresses of DNS servers, DHCP server, routers and other (options 3-11, and option 54)

• only one of -i and -r can be used
• only one layer of VLAN is supported
• supports only IPv4
• does not support tunneling
• does not support lease time

• README.md - this file
• Makefile - makefile for building the project
• main.cpp - main file of the project
• dhcp-stats.cpp - source code of the project
• dhcp-stats.h - header file of the project
• subnet.cpp - source code of the subnet class
• subnet.h - header file of the subnet class
• argparse.cpp - source code of the argument parser
• argparse.h - header file of the argument parser
• dhcp-stats.1 - man page of the project
• manual.pdf - documentation of the project