.\" Copyright (C) Roy Hills
.\"
.\" Copying and distribution of this file, with or without modification,
.\" are permitted in any medium without royalty provided the copyright
.\" notice and this notice are preserved.
.\"
.TH GET-OUI 1 "October 28, 2022"
.\" Please adjust this date whenever revising the man page.
.SH NAME
get-oui \- Fetch the arp-scan OUI file from the ieee-data package
.SH SYNOPSIS
.B get-oui
.RI [ options ]
.SH DESCRIPTION
.B get-oui
fetches the MAC/Vendor registry data from the ieee-data package
and converts it to the format used by arp-scan. The contents of
the following registries are processed:
.sp
.TS
L L L .
MA-L	24-bit	The original OUI registry
MA-M	28-bit	Medium address block registry
MA-S	36-bit	Small address block registry (OUI-36)
IAB	36-bit	The IAB registry (closed for new applications)
.TE
.PP
This script creates
.I /usr/share/arp-scan/ieee-oui.txt
from the latest data on the ieee-data package.
You can run
.B # update-ieee-data && get-oui
occasionally to keep the OUI file up to date.

.PP
The OUI data is fetched from ieee-data package files defined in the \fBget-oui\fP script
and the output file is saved to the file
.I /usr/share/arp-scan/ieee-oui.txt
The output file name can be changed with the
.B -f
option.
.PP
The
.I /usr/share/arp-scan/ieee-oui.txt
file that is produced and updated by this script is used by
.B arp-scan
to determine the Ethernet card vendor from its hardware address.
.SH OPTIONS
.TP
.B -h
Display a brief usage message and exit.
.TP
\fB-f \fI<fn>\fR
Write the output to the specified file instead of the default
.I /usr/share/arp-scan/ieee-oui.txt.
.TP
.B -v
Display verbose progress messages.
.SH FILES
.TP
.I /usr/share/arp-scan/ieee-oui.txt
The default output file.
.SH EXAMPLES
.nf
$ ./get-oui -v
Renaming ieee-oui.txt to ieee-oui.txt.bak
Opening ieee-oui.txt for output
Processing IEEE IAB registry data from file:///var/lib/ieee-data/iab.csv
        Downloaded 381454 bytes
        4575 IAB entries written to ieee-oui.txt
Processing IEEE MAM registry data from file:///var/lib/ieee-data/mam.csv
        Downloaded 492756 bytes
        4477 MAM entries written to ieee-oui.txt
Processing IEEE OUI registry data from file:///var/lib/ieee-data/oui.csv
        Downloaded 3051812 bytes
        32845 OUI entries written to ieee-oui.txt
Processing IEEE OUI36 registry data from file:///var/lib/ieee-data/oui36.csv
        Downloaded 466151 bytes
        5131 OUI36 entries written to ieee-oui.txt

Total of 47028 MAC/Vendor mappings written to ieee-oui.txt
.fi
.SH NOTES
.B get-oui
is implemented in Perl, so you need to have the Perl interpreter installed on
your system to use it.
.PP
.B get-oui
uses the
.I LWP::UserAgent
and
.I Text::CSV
Perl modules to fetch and process the IEEE registry data. You must have
these modules installed on your system for
it to work. These modules are available on most distributions, often called
.I libwww-perl
and
.IR libtext-csv-perl .
They are also available in source form from CPAN.
.PP
You can use a proxy server by defining the
.I http_proxy
environment variable.
.SH "SEE ALSO"
.TP
.BR arp-scan (1)
.TP
.BR arp-fingerprint (1)