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#!/bin/bash
# SPDX-License-Identifier: GPL-2.0
# This example script retrieves the DHCP state of a given interface.
# In the interest of keeping the KVP daemon code free of distro specific
# information; the kvp daemon code invokes this external script to gather
# DHCP setting for the specific interface.
#
# Input: Name of the interface
#
# Output: The script prints the string "Enabled" to stdout to indicate
# that DHCP is enabled on the interface. If DHCP is not enabled,
# the script prints the string "Disabled" to stdout.
#
# Distributions may need to adapt or replace this script for their
# preferred network configuration system.
# Report status based on result of previous command
report() {
if [ $? -eq 0 ]; then
echo "Enabled"
else
echo "Disabled"
fi
}
check_network_manager() {
local conn_name
# Check that the interface has a configured connection, and get
# its name
if conn_name="$(nmcli -g GENERAL.CONNECTION device show "$1" 2>/dev/null)" &&
[ "$conn_name" ]; then
# Check whether the connection enables DHCPv4
test "$(nmcli -g ipv4.method connection show "$conn_name")" = auto
report
else
return 1
fi
}
check_systemd_networkd() {
local status
# Check that the interface is managed by networkd
if status="$(networkctl status --json=short -- "$1" 2>/dev/null)" &&
! printf '%s' "$status" |
grep -qE '"AdministrativeState":"unmanaged"'; then
# Check for DHCPv4 client state in the interface status
printf '%s' "$status" | grep -q '"DHCPv4Client":'
report
else
return 1
fi
}
check_ifupdown() {
local conf_name
# Check that a configuration has been applied to the interface
if command -v ifquery >/dev/null &&
conf_name="$(ifquery --state -- "$1" | sed 's/[^=]*=//')" &&
[ "$conf_name" ]; then
# Check whether that configuration enables DHCPv4.
# Unfortunately ifquery does not expose the method name, so we
# have to grep through the configuration file(s) and make an
# assumption about which are included.
find /etc/network/interfaces /etc/network/interfaces.d \
-type f -regex '.*/[a-zA-Z0-9_-]+$' -print |
xargs grep -qE '^\s*iface\s+'"$conf_name"'\s+inet\s+dhcp(\s|$)'
report
else
return 1
fi
}
check_network_scripts() {
local if_file="/etc/sysconfig/network-scripts/ifcfg-"$1
if [ -f "$if_file" ]; then
grep -q dhcp "$if_file"
report
else
return 1
fi
}
check_network_manager "$1" ||
check_systemd_networkd "$1" ||
check_ifupdown "$1" ||
check_network_scripts "$1" ||
report
|
