| #!/bin/sh -e | |
| # based on https://gist.github.com/corny/7a07f5ac901844bd20c9 | |
| hostname=$1 | |
| device=$2 | |
| v4_file=$HOME/.${hostname}.dynv6.addr4 | |
| [ -e $v4_file ] && old=`cat $v4_file` | |
| if [ -z "$hostname" -o -z "$token" ]; then | |
| echo "Usage: token=<your-authentication-token> $0 your-name.dynv6.net [device]" | |
| exit 1 | |
| fi | |
| if [ -n "$device" ]; then | |
| device="dev $device" | |
| fi | |
| v4_address=$(ip -4 addr list $device | grep "global" | sed -n 's/.*inet \([0-9.]\+\).*/\1/p' | head -n 1); | |
| if [ -e /usr/bin/curl ]; then | |
| bin="curl -fsS" | |
| elif [ -e /usr/bin/wget ]; then | |
| bin="wget -O-" | |
| else | |
| echo "neither curl nor wget found" | |
| exit 1 | |
| fi | |
| if [ -z "$v4_address" ]; then | |
| echo "no IPv4 address found" | |
| exit 1 | |
| fi | |
| current=$v4_address | |
| if [ "$old" = "$current" ]; then | |
| # when running via cron we do not need that kind of verbosity. | |
| # echo "IPv4 address unchanged" | |
| exit | |
| fi | |
| echo "new ipv4 address detected ${v4_address}, updating" | |
| # send addresses to dynv6 | |
| $bin "http://ipv4.dynv6.com/api/update?hostname=$hostname&ipv4=$v4_address&token=$token" | |
| # save current address | |
| echo $current > $v4_file |
Hello,
I get the error promt "/bin/sh: 0: Illegal option -" executing the script on my Raspberry Pi.
How can I fix this?
Hej hej,
when I used this script my internal IP was submitted to dynv6. So I updated line 20:
v4_address=$(curl http://my.ip.fi);Once I did it this way, my external IPv4 was sent properly. Indeed, curl needs to be installed on server for that reason and network needs to be fully established.
Kind regards
//neph
author considered manual change from "global" to "ppp0" on line 20 in linked article https://odnkz.blogspot.com/2018/09/ddns-xiaomi-mi-3g-router-padavan.html
Using curl is not correct because primary IP source is local device. When you use "curl http://my.ip.fi" you get the last registered IP address on the DynDNS service. This contradicts the purpose of the script - to inform the DynDNS service of the new local IP address.
I want to thank you (@pulsar256, @nephilim75). Thanks to your efforts, I have created a docker image that can be used to update multiple zones of Dynv6. Alternatively, the included scripts can be used separately or in a combined version of the script. However, I have taken the approach to leave the script unchanged as described here (to be updateable).
Hej hej,
when I used this script my internal IP was submitted to dynv6. So I updated line 20:
Once I did it this way, my external IPv4 was sent properly. Indeed, curl needs to be installed on server for that reason and network needs to be fully established.
Kind regards
//neph