68 lines
1.6 KiB
Plaintext
68 lines
1.6 KiB
Plaintext
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#!/bin/bash
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# List system's WAN and LAN ip addresses
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# Depends on ifconfig and awk
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if [[ $1 =~ '-h' ]]; then
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cat <<EOF
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List the system's WAN and LAN addresses
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USAGE:
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$(basename "$0")
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EOF
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exit 0
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fi
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awk_lan () {
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awk '
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BEGIN { print "Local:" }
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/UP/ {
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split($0, info, /:/)
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device_name = '"$1"'
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is_up = 1
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}
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match($0, /inet ([0-9]{1,3}\.){3}[0-9]{1,3}(\/[0-9]{1,3})? /) {
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if (is_up) {
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ip_addr = substr($0, RSTART + 5, RLENGTH - 5)
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printf(" %s: %s\n", device_name, ip_addr)
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is_up = 0
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}
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}' -
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}
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# List all possible inet addresses
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if command -v ip address &> /dev/null; then
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ip address | awk_lan 'substr(info[2], 2)'
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elif command -v ifconfig &> /dev/null; then
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ifconfig | awk_lan 'info[1]'
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else
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echo '`ifconfig` not found'
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fi
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# Print network's public IP address
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if command -v dig &> /dev/null; then
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public_ip=$(dig +short myip.opendns.com @resolver2.opendns.com)
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elif command -v host &> /dev/null; then
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public_ip=$(host myip.opendns.com resolver1.opendns.com)
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fi
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# Backup address fetching. Slower though more reliable
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if [[ -z $public_ip ]]; then
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if command -v curl &> /dev/null; then
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public_ip=$(curl --silent https://ifconfig.me/ip)
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elif command -v wget &> /dev/null; then
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public_ip=$(wget --quiet -O - https://ifconfig.me/ip)
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fi
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fi
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if [[ -n $public_ip ]]; then
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echo "$public_ip" | awk ' match($0, /([0-9]{1,3}\.){3}[0-9]{1,3}$/) {
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printf("Public (WAN): %s\n", substr($0, RSTART, RLENGTH))
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}'
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else
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echo 'Public IP not found'
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fi
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