#!/bin/bash
source ~/.bashrc
+
+
main() {
fqdn=$(hostname -f)
up4=false
- if ! read -r _ _ gateway _ < <(ip -4 route get 85.119.83.50 2>/dev/null); then
+ if ! read -r _ _ gateway _ ifdev _ < <(ip -4 route get 85.119.83.50 2>/dev/null); then
# if our internet is down, just give up, no need to have an error
if [[ ! $INVOCATION_ID ]]; then
echo $0: failed to get route, giving up
;;
esac
- if timeout -s 9 5 ssh-keyscan -p 2220 -t rsa $gateway 2>/dev/null | grep -qFx "[$gateway]:2220 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCH+/h1dGEfKEusBblndU2e6QT4wLCm5+yqr/sqh/0X9YfjR7BfWWm8nNmuP55cYc+Wuf5ljB1H1acXEcsl1y8e0j3agHfF0V74FE1N1zz5nn2Ep8NHnmqgEhza38ZxMPh+4p3X7zklEKU7+3SzybKBi8sg0wLzlS2LM0JaUN80zR2sK11Kye3dURUXPk78u5wodOkgcEYRwSYaDMJlUzWP+poRXIDJwFaMQnwmxbl/c84yOyaU0x/d6hFwoRscWecihX+vvBNeSyxR4xr2HDOyUWwJkctyAgt2p7w3tfkXOKcCRzTAjGVIMQLTvo0sG/yJbcyHoEFdFybCsgDvfyYn"; then
- # we are on a home network
+ athome=false
+ if [[ -s /dev/shm/dynamic-ip-update-state ]]; then
+ oldbytes=$(cat /dev/shm/dynamic-ip-update-state)
+ newbytes=$(awk '$1 == "'$ifdev':" {print $2 + $10}' /proc/net/dev)
+ if [[ $oldbytes == [1-9]* ]] && (( newbytes >= oldbytes )); then
+ athome=true
+ printf "%s\n" "$newbytes" >/dev/shm/dynamic-ip-update-state
+ fi
+ fi
+ if ! $athome && timeout -s 9 5 ssh-keyscan -p 2220 -t rsa $gateway 2>/dev/null | grep -qFx "[$gateway]:2220 ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCH+/h1dGEfKEusBblndU2e6QT4wLCm5+yqr/sqh/0X9YfjR7BfWWm8nNmuP55cYc+Wuf5ljB1H1acXEcsl1y8e0j3agHfF0V74FE1N1zz5nn2Ep8NHnmqgEhza38ZxMPh+4p3X7zklEKU7+3SzybKBi8sg0wLzlS2LM0JaUN80zR2sK11Kye3dURUXPk78u5wodOkgcEYRwSYaDMJlUzWP+poRXIDJwFaMQnwmxbl/c84yOyaU0x/d6hFwoRscWecihX+vvBNeSyxR4xr2HDOyUWwJkctyAgt2p7w3tfkXOKcCRzTAjGVIMQLTvo0sG/yJbcyHoEFdFybCsgDvfyYn"; then
+ athome=true
+ awk '$1 == "'$ifdev':" {print $2 + $10}' /proc/net/dev > /dev/shm/dynamic-ip-update-state
+ fi
+
+
+ if $athome; then
cur4="$(dig +short $dynhost @iankelling.org | tail -1)"
if ip4=$(curl -s4 https://iankelling.org/cgi/pubip); then
if [[ $cur4 && $ip4 && $cur4 != $ip4 ]]; then