Anyone with DDWRT/sendmail experience?

[Azure]

I'm trying to create a script that lets me plug in a router anywhere in the world and have it send me an email every certain amount of time.

Here is the script I have so far.

#!/bin/sh
# WANIPCheck

# Some settings
INTERVAL=10
## SMTP="smtp.secureserver.net"
## FROM="test@myisp.com"
## FROM_NAME="JohnQ"
## USER="mylogin@mydomain.com"
## PASSWORD="XXXX"
## SUBJECT="TEST 1"
## MESSAGE="Test number 1"
## TO="test@anyemailaddress.com"


MAIL_BINARY=/jffs/sendmail
MAIL_SERVER="mail.myisp.ca"
## USER="user@myisp.ca"
## PASSWORD="xxxxx"
MAIL_TO="mail@anyemailaddress.com"
MAIL_FROM="mail@mydomain.com"
MAIL_SUBJECT="Router IP Address Update"


# Function for sending the log to an email address
##sendemail()

# The "main" loop
while sleep $INTERVAL
do
{
# Create the email message
CURR_WAN_IPADDR=`nvram get wan_ipaddr`
echo "Subject: $MAIL_SUBJECT" > /tmp/mailnotification
echo "WAN IP-Address is:"$CURR_WAN_IPADDR >> /tmp/mailnotification

# Send the email message
## /jffs/sendmail -S"$SMTP" -f$FROM -F"$FROM_NAME" -d"$DOMAIN" -u"$USER" -p"$PASSWORD" -s"$SUBJECT" -m"$MESSAGE" $TO
cat /tmp/mailnotification | $MAIL_BINARY -s$MAIL_SERVER -f$MAIL_FROM -v $MAIL_TO

# Cleanup email message
## echo $MAIL_BINARY
## echo $MAIL_SERVER
## echo $MAIL_TO
## echo $MAIL_FROM
## echo $MAIL_SUBJECT
cat /tmp/mailnotification
## rm /tmp/mailnotification
}
done

Ignore all the lines I commented out. I'm just playing around and don't want to delete stuff I might need.

I have gotten this working through my ISPs SMTP servers, but as soon as I try to use Gmail, Hotmail, or my domain's SMTP server(GoDaddy)....it doesn't go through.

I need to be able to modify the script to login and authorize the username/password, but I'm not completely sure how to do it. At least I think that would fix the problem.

I would prefer to use Gmail, but since they use SSL encryption it might not work. I could just as easily use the Godaddy smtp server, if it would work.

I'd really appreciate some help. Thanks.

[Azure]

I'm using mini sendmail, and my limited understanding says it only works with your ISPs smtp server.

That is what I'm trying to get around.

[Shazam]

Are you saying that you want to send email from any SMTP server, even one you don't have an account on?

[Azure]

No, just from one that I have an account with.

[sclitheroe]

Lots of ISP's don't allow port 25 connections outbound from their networks (they only allow SMTP on 25 to one of their own SMTP servers) - Telus is one such ISP, for example. Can you configure your sendmail instance to connect on an alternate MSA, which is typically port 587?

[sclitheroe]

Personally I would also rethink the email approach too - why not load a util on there that would allow your routers to make secure DNS A record updates on a DNS server that you run yourself (and probably run on a non-standard port to avoid any other ISP interactions)...in effect becoming your own personal DynDNS service. Then, you have a name server that can always resolve the names of your routers to IP addresses.

[Azure]

Originally Posted by sclitheroe

Lots of ISP's don't allow port 25 connections outbound from their networks (they only allow SMTP on 25 to one of their own SMTP servers) - Telus is one such ISP, for example. Can you configure your sendmail instance to connect on an alternate MSA, which is typically port 587?

There is actually an option to change the port, IIRC. I'll try that.

Thanks.

[Azure]

Originally Posted by sclitheroe

Personally I would also rethink the email approach too - why not load a util on there that would allow your routers to make secure DNS A record updates on a DNS server that you run yourself (and probably run on a non-standard port to avoid any other ISP interactions)...in effect becoming your own personal DynDNS service. Then, you have a name server that can always resolve the names of your routers to IP addresses.

What kind of utility would do that?

I'm trying to get away from assigning IP addresses until the routers are plugged in somewhere.

So I need a quick way to get that IP address.

[Shazam]

Originally Posted by sclitheroe

Lots of ISP's don't allow port 25 connections outbound from their networks (they only allow SMTP on 25 to one of their own SMTP servers) - Telus is one such ISP, for example. Can you configure your sendmail instance to connect on an alternate MSA, which is typically port 587?

Yeah, this essentially. Otherwise your SMTP server becomes a massive relaying opportunity.

[Azure]

Even if I use ssmtp I don't think its possible to actually have it connect properly.

My best bet would probably be setting up some kind of DynDNS server.

Ever heard of MintDNS?

[sclitheroe]

Here's another approach that would be even easier - set up a web server somewhere that you have access to the logs for. Have a scheduled task on each router that fetches a page such as http://mywebserver/name_of_router.html, on an hourly basis

Then, you can grep the webserver logs for the router name, and the last line found is the most recent IP address for that router.

Easy Peasy Lemon Squeezy

[Azure]

Yeah, you're pretty smart for a geek.



Thanks, I'll look into that.

[Azure]

Alright, I have the script put together.

Problem is I don't know if a command exists in Linux where you can browse to a router in the command line.

At least I haven't been able to find it.

[ericschand]

Originally Posted by Azure

Alright, I have the script put together.

Problem is I don't know if a command exists in Linux where you can browse to a router in the command line.

At least I haven't been able to find it.

Text-based web browser?

Try "lynx"

ers

[sclitheroe]

You mean browser from a router command line, non-interactively, right? In that case, wget is what you want.

Hell, you could even pipe a text file with an HTTP GET command into telnet over port 80, assuming the router's OS has a telnet function.

[Azure]

It does have a telnet function.

Anyways, the following script...

#!/bin/sh
# NSlookup, script to browse to a webserver to drop the routers IP addres for future configuration.
# Created by Azure

# Some settings
INTERVAL=10

# The "main" loop
while sleep $INTERVAL
do
wget http://mywebserver.org
done

Works perfectly. When I check the log files on my webserver they all show up.

Being able to send a text file could let me use '`nvram get wan_ipaddr`' and send it on through. I'll try to figure out how to send it with HTTP GET.

The other thing I was thinking would be to create a subdomain, like mywebserver.com/subdomain. Would it be possible to do a special search on my web server to only check the log files for that subdomain?

That would eliminate basically all my other problems and I could just run the script above on every router.

[sclitheroe]

Originally Posted by Azure

It does have a telnet function.

Anyways, the following script...



Works perfectly. When I check the log files on my webserver they all show up.

Being able to send a text file could let me use '`nvram get wan_ipaddr`' and send it on through. I'll try to figure out how to send it with HTTP GET.

The other thing I was thinking would be to create a subdomain, like mywebserver.com/subdomain. Would it be possible to do a special search on my web server to only check the log files for that subdomain?

That would eliminate basically all my other problems and I could just run the script above on every router.

Even wget'ing an invalid URL should be logged in your web server logs, so you wget http://mywebserver/$MYIPADDRESS , (assuming you've set $MYIPADDRESS first, of course) and its not going to return anything, but it will get logged, and from there you can parse the logs. Or something like that

[Azure]

Or I could use the grep command.

assuming the log files are at the following directory.../var/log/apache2/access.log

I should be able to go

grep subdomain access.log

and find all results in the access.log folder that have subdomain included. Which could be a lot, but I would change the 'subdomain' to something I know wouldn't be in there as a rule.

or better yet, go

grep -i subdomain access.log

and it should search everything while being case insensitive.

[Azure]

Yep.

If I put in the script to go to

http://mywebserver.org/routerconfig

and run the script, then when I go to the webserver to check the logs and go

grep -i routerconfig access.log

it brings up all requests made to that subdomain despite it not existing.

sweet, now I just have to figure out how to make it work as a script on the router, and not just a script i'm executing in telnet.

thanks!