Topic: custom DynDNS not working? [SOLVED]

[purzel]

Hi all!

After hours of "goggle-ing" without success: This is my first post in this forum - hope I'm right here....

While installing SME Server 9 I selected "custom" for DynDNS because my provider (SPDNS.DE) wasn't listed. I entered correct data and proceeded with installation. When the installation was finished, I noticed that it's not working, there was an error message in /var/log/messages:
Can't exec "/sbin/e-smith/dynamic-dns/custom": No such file or directory at /etc/e-smith/events/ipchange/S85update-dns line 52.

OK, I created an own script based on dyndns.org in the same directory, made it executable and tried to run:
/etc/e-smith/events/ipchange/S85update-dns
It worked, my dynamic DNS entry was successful updated. Hooray!

But I was pleased too early. It only works when I run S85update-dns manually. It's neither be run automatically when getting a new IP from my ISP nor when rebooting (!). In /var/log/messages I can read:
Running event handler: /etc/e-smith/events/ipchange/S85update-dns
S85update-dns=action|Event|ip-change|Action|S85update-dns|Start| 14379949 282796|End|14379949 563611|Elapsed|0.280815

Is this an error? It looks for me that the event is triggered and the Perl-Script is executed - but not correctly.

Please help!

Thanks in advance,
Matthias

[guest22]

Hi and welcome,

obviously you are encouraged to learn the basics of SME Server and its db and templating system. The manual would be a good start. That would learn you that you can not consider any template fragment (e.g. 10thispart) as a script by itself, but that it is a part of a templating system.

Having said that, the issue you have with 'can't exec "/sbin/e-smith/dynamic-dns/custom" is the one to concentrate on. Maybe you have hit a bug, and if so, it should be reported to the bug tracker.

Thanks,
guest

[CharlieBrady]

Is this an error? It looks for me that the event is triggered and the Perl-Script is executed - but not correctly.

See what happens if you type:

env - /etc/e-smith/events/ipchange/S85update-dns

Perhaps if you post your custom script somewhere people can spot an error or test it out.

[purzel]

Hi!

See what happens if you type:

env - /etc/e-smith/events/ip-change/S85update-dns

Nothing (viewable) happend, but my script worked: I got a nochg reply from the server.

I've UNinstalled ddclient - and it SEEMS to work now, at least when rebooting.
Now I have to wait for a pppoe-"redial" because of forced disconnection from my ISP. This usually happens after 24 hours of connection time.
Maybe ddclient "blocked" the execution of  /etc/e-smith/events/ip-change/S85update-dns in some way?

Here's my custom script (/sbin/e-smith/dynamic-dns/custom) if needed by somebody:

Code: [Select]

#!/bin/sh
# Description: www.spdns.de (free service, german)

#------------------------------------------------------
# spdns.de dynamic DNS update handler / client
#------------------------------------------------------

IPADDR=$1
USERID=$2
PASSWD=$3
DOMAIN=$4

wget -q -O /tmp/dyndns.log \
--user-agent="SPDNS update client for Linux" \
http://$USERID:$PASSWD@update.spdns.de/nic/update?\
hostname=$USERID\&myip=$IPADDR

RESULT=`cat /tmp/dyndns.log`
case "$RESULT" in
        good*)
            logger -t spdns.de "Update at $IPADDR succeeded." ;;
        nochg*)
            logger -t spdns.de "IP Address $IPADDR already in database." ;;
        notfqdn*)
            logger -t spdns.de \
                "$DOMAIN is not a Fully-Qualified Domain Name." ;;
        !yours*)
            logger -t spdns.de "$DOMAIN does not belong to you." ;;
        badauth*)
            logger -t spdns.de "Bad username or password $USERID:$PASSWD." ;;
        abuse*)
            logger -t spdns.de \
            "$DOMAIN is blocked for abuse; contact support@securepoint.de" \
            "to unblock." ;;
        numhost*)
            logger -t spdns.de "Too many or too few hosts found." ;;
        invalidip*)
            logger -t spdns.de "Invalid IP Adress submitted.";;
        *)
            logger -t spdns.de "Unknown response $RESULT. Status was $?";;
esac

exit 0

I will keep you informed...

[CharlieBrady]

Use of the temporary file is not secure. I'd suggest that you use:

RESULT=$(wget -q -O - ...)

You will also have problems if your username or password contains spaces or metacharacters. Use double quotes around your http://... command argument.

[purzel]

Use of the temporary file is not secure. I'd suggest that you use:

RESULT=$(wget -q -O - ...)

A good hint, thanks - I will do so.

But then I suggest to do the same in /sbin/e-smith/dynamic-dns/dyndns.org originally supplied by the installation
... even though ... dyndns.org isn't free of charge anymore

You will also have problems if your username or password contains spaces or metacharacters. Use double quotes around your http://... command argument.

It's not enough to put "$USERID:$PASSWD" into double quotes like done in /sbin/e-smith/dynamic-dns/dyndns.org?

[CharlieBrady]

It's not enough to put "$USERID:$PASSWD" into double quotes like done in /sbin/e-smith/dynamic-dns/dyndns.org?

That would be equivalent.

[purzel]

Now I have to wait for a pppoe-"redial" because of forced disconnection from my ISP. This usually happens after 24 hours of connection time.

It worked yesterday evening.
Now I have double quotes around my variables and no temporary file anymore. Let's see if it remains working...

[purzel]

It works. The devil may know what was wrong.

The updated version of my script:

Code: [Select]

#!/bin/sh
# Description: www.spdns.de (free service)

#------------------------------------------------------------
# spdns.de dynamic DNS update handler.
#------------------------------------------------------------

IPADDR=$1
USERID=$2
PASSWD=$3
DOMAIN=$4

RESULT=$(wget -q -O /tmp/dyndns.log \
--user-agent="SPDNS update client for Linux" \
http://"$USERID:$PASSWD"@update.spdns.de/nic/update?\
hostname="$USERID"\&myip="$IPADDR")

case "$RESULT" in
        good*)
            logger -t spdns.de "Update at $IPADDR succeeded." ;;
        nochg*)
            logger -t spdns.de "IP Address $IPADDR already in database." ;;
        notfqdn*)
            logger -t spdns.de \
                "$DOMAIN is not a Fully-Qualified Domain Name." ;;
        !yours*)
            logger -t spdns.de "$DOMAIN does not belong to you." ;;
        badauth*)
            logger -t spdns.de "Bad username or password $USERID:$PASSWD." ;;
        abuse*)
            logger -t spdns.de \
            "$DOMAIN is blocked for abuse; contact support@securepoint.de" \
            "to unblock." ;;
        numhost*)
            logger -t spdns.de "Too many or too few hosts found." ;;
        invalidip*)
            logger -t spdns.de "Invalid IP Adress submitted.";;
        *)
            logger -t spdns.de "Unknown response $RESULT. Status was $?";;
esac

exit 0


[Stefano]

please, create an account in bugzilla and post there your code and as much details as you can give about this provider, creating a NFR.. in this way maybe we can add this provider to the available list

thank you in advance