| #!/bin/sh |
| # |
| # sample script for detecting local IP |
| # 2014-2015 Christian Schoenebeck <christian dot schoenebeck at gmail dot com> |
| # |
| # activated inside /etc/config/ddns by setting |
| # |
| # option ip_source 'script' |
| # option ip_script '/usr/lib/ddns/getlocalip_sample.sh -6' !!! parameters ALLOWED |
| # |
| # the script is executed (not parsed) inside get_local_ip() function |
| # of /usr/lib/ddns/dynamic_dns_functions.sh |
| # |
| # useful when this box is the only DDNS client in the network |
| # IP adresses of "internal" boxes could be detected with this script |
| # so no need to install ddns client on every "internal" box |
| # On IPv6 every internal box normally has it's own external IP |
| # |
| # This script should |
| # - return the IP address via stdout echo -n "...." !!! without line feed |
| # - report errors via stderr echo "...." >&2 |
| # - return an error code ('0' for success) exit 123 |
| |
| case $1 in |
| -4) echo -n "8.8.8.8" # never append linefeed or simular |
| exit 0 |
| ;; # IP's of Googles public DNS |
| -6) echo -n "2001:4860:4860::8888" |
| exit 0 |
| ;; |
| *) echo "$0 - Invalid or missing parameter" >&2 |
| exit 1 |
| esac |
| echo "Should never come here" >&2 |
| exit 2 |