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