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ifinfo.sh
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ifinfo.sh
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#!/usr/bin/env bash
##
## ifinfo - list IP addresses registered for a network interface
## Copyright (C) 2020-2023 Daniel Haase
##
## This program is free software: you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation, either version 3 of the License, or
## (at your option) any later version.
##
## This program is distributed in the hope that it will be useful,
## but WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
## GNU General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this program. If not, see <http://www.gnu.org/licenses/gpl.txt>.
##
# shellcheck disable=SC2310
set -o errexit
set -o nounset
set -o pipefail
set -o noclobber
NAME="ifinfo"
VERSION="0.3.3"
function check_command {
if ! command -v "${1}" &>/dev/null; then
echo >&2 "no such command \"${1}\""
exit 1
fi
}
function print_version {
cat <<-EOF
${NAME} ${VERSION}
copyright (c) 2020-2023 Daniel Haase
EOF
}
function print_usage {
print_version
cat <<-EOF
usage: ${NAME} [<interface>]
${NAME} [--version | --help]
<interface>
network interface to print information about
-V | --version
print version information and exit
-h | --help
print this usage description and exit
EOF
}
function is_interface_up {
local -r interface="${1}"
if [[ -z "${interface}" ]]; then
return 1
fi
ip link show dev "${interface}" |
grep --max-count=1 --fixed-strings "state UP"
} &>/dev/null
function has_interface_carrier {
local -r interface="${1}"
if [[ -z "${interface}" ]]; then
return 1
fi
ip link show dev "${interface}" |
head --lines=1 |
grep --max-count=1 --fixed-strings --invert-match "NO-CARRIER"
} &>/dev/null
function is_wireless_interface {
local -r interface="${1}"
if [[ -z "${interface}" ]]; then
return 1
fi
iw dev "${interface}" info
} &>/dev/null
check_command "awk"
check_command "cat"
check_command "grep"
check_command "head"
check_command "ip"
check_command "iw"
check_command "wc"
declare interface=""
if [[ $# -eq 1 ]]; then
case "${1}" in
-V | --version)
print_version
exit 0
;;
-h | --help)
print_usage
exit 0
;;
-*)
print_usage
exit 2
;;
*)
interface="${1}"
;;
esac
elif [[ $# -gt 1 ]]; then
print_usage
exit 2
fi
declare default_interface
default_interface="$(ip route 2>/dev/null |
awk '/^default/ { print $5 }' |
head --lines=1)" || {
echo >&2 "default network interface not found"
exit 3
}
interface="${interface:-"${default_interface}"}"
declare address_info
address_info="$(ip address show dev "${interface}" 2>/dev/null)" || {
echo >&2 "no such interface \"${interface}\""
exit 4
}
if ! has_interface_carrier "${interface}"; then
echo >&2 "interface \"${interface}\" has no carrier"
exit 3
fi
if ! is_interface_up "${interface}"; then
echo >&2 "interface \"${interface}\" is down"
exit 3
fi
declare interface_type
if is_wireless_interface "${interface}"; then
interface_type="wireless"
else
interface_type="wired"
fi
declare mac_address
declare -i ip4_count
declare -i ip6_count
mac_address="$(echo "${address_info}" | awk '/link\/ether/ { print $2 }')"
ip4_count="$(echo "${address_info}" | grep --count 'inet[^6]')"
ip6_count="$(echo "${address_info}" | grep --count --fixed-strings 'inet6')"
cat <<-EOF
interface ${interface} (${interface_type})
mac:
${mac_address}
EOF
if [[ ${ip4_count} -gt 0 ]]; then
cat <<-EOF
ip4 (${ip4_count}):
EOF
echo "${address_info}" |
awk '/inet[^6]/ { print " "$2 }'
fi
if [[ ${ip6_count} -gt 0 ]]; then
cat <<-EOF
ip6 (${ip6_count}):
EOF
echo "${address_info}" |
awk '/inet6/ { print " "$2 }'
fi
echo ""
exit 0