Monitor network interfaces for IP address changes
Requires ip only, optionally systemd.
$ ipaddr
enp1s0 fe80::2/64
enp1s0 2001:db8::1:2/64
enp1s0 192.0.2.102/24
wlp2s0 fe80::2/64
wlp2s0 2001:db8::2:2/64
wlp2s0 192.0.2.202/24
$ ipaddr --help
IP Address Monitor
ipaddr
ipaddr show
If a monitor is running on the same $IPADDR_WORK directory and the
$IPADDR_HOOK/20-list hook is executable, all currently assigned IP addresses
are shown in the format of the event variable $list.
ipaddr monitor
Monitor network interfaces for IP address changes. Hooks in $IPADDR_HOOK are
executable or ignored. They are entered in lexical order and have access to
the environment and event variables listed below. Hooks are advised to wrap
file operations with `flock'. Long hooks delay subsequent events but no event
is ever missed.
ipaddr OPTION
Print and exit.
OPTIONs:
-h, --help Print help.
-v, --version Print version.
Environment variables:
$IPADDR_WORK /run/ipaddr
$IPADDR_HOOK /etc/ipaddr.d
Event variables:
$list <list of all currently assigned addresses
as "$interface\t$address/$prefix\n"
in the order they have been assigned
inclusive the current $action>
$action assign|update (lifetime via RA)|resign
$index <network interface index>
$interface <network interface name>
$family inet|inet6
$address <IP address>
$prefix <number of prefix bits>
$brd <broadcast address (inet only)>
$scope <as of `ip-address'>
$flag_list <as of `ip-address' but separated with "\n">
$valid_lft <as of `ip-address' but without "sec" postfix>
$preferred_lft <as of `ip-address' but without "sec" postfix>
Executable hooks:
/etc/ipaddr.d/10-echo
/etc/ipaddr.d/20-list
$ sudo make install
install -m 644 -Dt /usr/lib/systemd/system/ ipaddr.service
install -m 755 -Dt /usr/bin/ ipaddr
install -m 755 -Dt /etc/ipaddr.d/ ipaddr.d/10-echo ipaddr.d/20-list
systemctl daemon-reload
systemctl enable ipaddr
systemctl restart ipaddr
$ sudo make uninstall
systemctl disable ipaddr
Removed /etc/systemd/system/network.target.wants/ipaddr.service.
systemctl stop ipaddr
rm -f /usr/lib/systemd/system/ipaddr.service
rm -f /usr/bin/ipaddr
rm -f /etc/ipaddr.d/10-echo /etc/ipaddr.d/20-list
rmdir --ignore-fail-on-non-empty /etc/ipaddr.d/
systemctl daemon-reload
Copyright (c) 2017 Rouven Spreckels n3vu0r@qu1x.org
Usage of the works is permitted provided that this instrument is retained with the works, so that any entity that uses the works is notified of this instrument.
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