php dynamic ip script

secondhandman · 05-31-2012, 07:50 AM

I want to create a script that will send an email every time the dynamic ip of my site changes. I have followed the following steps to install php mail options:

apt-get install php-pear
pear install mail
pear install Net_SMTP
pear install Auth_SASL
pear install mail_mime
apt-get install postfix

I have a script that reports the ip address when ever it's ran, but I only want it to send a message when the ip address changes. The code for reporting my public ip address is as follows:

<?php
$to = "me@example.com";
$subject = "Routers ip address";
$body = exec("curl -s http://whatsmyip.net/ |grep -i '<title>' | cut -d : -f$
if (mail($to, $subject, $body)) {
echo("Message successfully sent!");
} else {
echo("Message delivery failed...");
}
?>

I have tried a few thing to get this to work, but no luck. I would like this script to only send a message when the ip address changes if possible:

/* DOES NOT WORK */

<?php
$body = exec("curl -s http://whisismyip.net/ |grep -i '<title>' | cut -d : -f 2 | sed 's!</title>!!'");
$ip = "/home/user/Documents/currentip";
/*currenip is a file with the current ip address in it! */

if ($body != $ip) {
$to = "user@example.com"
$subject = "Public ip address";
$body = exec("curl -s http://whisismyip.net/ |grep -i '<title>' | cut -d : -f 2 | sed 's!</title>!!'");
} else {
echo("Message delivery failed...");
}
?>

This last script doesn't work!! I've tried! Please help, you're my only hope!
edit: also it doesn't send mail!

pan64 · 05-31-2012, 08:45 AM

At least the sed script is incorrect: sed 's!</title>!!' would be better.
Do you have any error messages?

secondhandman · 05-31-2012, 12:14 PM

No errors! It hangs for a short time and returns me to the command line.

That was typo! I'll edit the post.

Thanks for the comment.

pan64 · 05-31-2012, 01:25 PM

$ip = "/home/user/Documents/currentip";
this line means the variable ip will be equal to the filename, not the content of the file. So you need to open the file and read the first line. You also need to check the case when this file was not available. Also, if ip changed you need to save it.

Babertje · 05-31-2012, 02:44 PM

Maybe a betterway is to use only php to fetch your IP

Code:

<?php
// Freegeoip.net csv service
// to me this returns: 86.93.xxx.yyy,NL,Netherlands,07,Noord-Holland,Haarlem,,52.3667,4.65,
$url = 'http://freegeoip.net/csv/';
$data = file_get_contents($url);
// only need first part
$ip_adress = split(",", $data);
echo $ip_adress[0];
?>

secondhandman · 05-31-2012, 07:19 PM

Quote:

Originally Posted by pan64

$ip = "/home/user/Documents/currentip";
this line means the variable ip will be equal to the filename, not the content of the file. So you need to open the file and read the first line. You also need to check the case when this file was not available. Also, if ip changed you need to save it.

How would I go about doing this? I think I'm having trouble with the if statements?

I'll try out that code Babertje! Thanks.

Babertje · 06-01-2012, 02:25 AM

To get the content of that file

Code:

$stored_ip file_get_contents('/home/user/Documents/currentip');

also take a look at the php reference http://www.php.net/manual/en/langref.php this is your most usefull place to look for any php related solutions I guess.

secondhandman · 06-08-2012, 12:03 PM

I still can't get this to work

Very new to php and linux. Thanks for your help!

Script still does nothing, just hangs!

secondhandman · 06-08-2012, 12:14 PM

can I call on php in a shell script? That might help me make it work!

pan64 · 06-08-2012, 12:25 PM

yes, you can: http://php.net/manual/en/features.commandline.php

Babertje · 06-08-2012, 01:40 PM

Quote:

Script still does nothing, just hangs!

Open a terminal and type:

Code:

tail -f /var/log/httpd/error_log

Run your script and if your php script doesn't work correctly you can get the concept of what goes wrong.