I’m trying to get a value from a netcat connection started at a php file, but it dies with:
localhost [127.0.0.1] 2000 (?) : Connection refused
I don’t know why but it works well if I ssh it as apache user (www-data), this is what I’ve done:
1) Start an endless loop serving a date with a little delay:
$ (while true; do nc -l -p 2000 -c "sleep 5; date"; done)&
2) Check if is working:
$ su www-data $ nc localhost 2000 Fri Oct 16 21:33:20 COT 2009
3) Create /var/www/test.php as follows:
<pre><?php exec('nc localhost 2000>>/var/www/dates.txt 2>>/var/www/errors.txt &'); ?></pre>
4) Run it on a browser:
http://myserver.com/test.php
5) Finally take a look at both txt’s, dates is empty (nothing like the response in #2) and errors has the “Connection refused” error.
The server is a LAMP cluster running Ubuntu Server 9.04 with DRBD and Heartbeat.
What is driving me crazy is that this test.php works well in my laptop (LAMP on Ubuntu Desktop 9.04) and the server seems to have the ports already open and listening:
$ netstat -ntpl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 0.0.0.0:4743 0.0.0.0:* LISTEN 2326/openhpid tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 3364/mysqld tcp 0 0 0.0.0.0:2000 0.0.0.0:* LISTEN 9510/nc tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 3470/apache2 tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 2320/sshd tcp 0 0 127.0.0.1:3551 0.0.0.0:* LISTEN 2354/apcupsd tcp6 0 0 :::22 :::* LISTEN 2320/sshd
I think that this is a programming related question right?, if not just close it without any comments please.
Thank in advanced!!!
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Answer
Well, it was a permission problem after all… fixed editing /etc/sudoers with visudo to add:
www-data ALL = NOPASSWD: /bin/nc