Check if Port is open

pkonduru · 12th January 2016, 22:57

Hi All,

I am trying to use this in my installer to see if a port is open. I need to show a message box if the port cannot be used or proceed if its ok to use the port.

http://nsis.sourceforge.net/Check_open_ports

I am not able to figure out the example in this page. If I used the condition with {If}, how would this be:

${If} ${TCPPortOpen} $PortNumber
MessageBox MB_OK|MB_ICONSTOP "$PortNumber is already using by another program..."
Abort
${Else}
MessageBox MB_OK"$PortNumber is open to use"

Is this correct?

Anders · 12th January 2016, 23:27

Looks OK to me. What happens when you run your installer?

pkonduru · 13th January 2016, 00:09

The installation proceeds no matter what port I give. Is there any port on my Windows machine I can specify where this check will fail and abort?

JasonFriday13 · 13th January 2016, 03:46

There should be an ${EndIf} at the end of that code. Do you get any warnings when you compile the script?

pkonduru · 13th January 2016, 18:09

Hi Jason,

Yes I do have a ${EndIf}, didnt post the whole snippet, here it is:

${If} ${TCPPortOpen} $PortNumber
MessageBox MB_OK|MB_ICONSTOP "$PortNumber is already using by another program..."
Abort
${Else}
MessageBox MB_OK "$PortNumber is open to use"
${EndIf}

what I don't get is , if the Port is open as per this line below,

${If} ${TCPPortOpen} $PortNumber

Doesn't this mean that the port is OK to use and proceed with the install?

Anders · 13th January 2016, 21:11

Open probably means some application is using it. I don't understand how this can be so hard to test, since you are checking for ports I assume you have some application that opens a port so you can just run it and test your installer. You can also use netstat or download TCPView to find open ports on your machine...

pkonduru · 14th January 2016, 21:32

Thanks Anders. My understanding was "TCPPortOpen" meant an "Open" port which one could use, sorry for the confusion. I did verify that the code is working by entering a port which was in use by the application.

Thank you everyone for the inputs.

12th January 2016, 22:57	#1
pkonduru Member Join Date: Jul 2015 Posts: 62	Check if Port is open Hi All, I am trying to use this in my installer to see if a port is open. I need to show a message box if the port cannot be used or proceed if its ok to use the port. http://nsis.sourceforge.net/Check_open_ports I am not able to figure out the example in this page. If I used the condition with {If}, how would this be: ${If} ${TCPPortOpen} $PortNumber MessageBox MB_OK\|MB_ICONSTOP "$PortNumber is already using by another program..." Abort ${Else} MessageBox MB_OK"$PortNumber is open to use" Is this correct?

12th January 2016, 23:27	#2
Anders Moderator Join Date: Jun 2002 Location: ${NSISDIR} Posts: 5,442	Looks OK to me. What happens when you run your installer? IntOp $PostCount $PostCount + 1

13th January 2016, 03:46	#4
JasonFriday13 Major Dude Join Date: May 2005 Location: New Zealand Posts: 916	There should be an ${EndIf} at the end of that code. Do you get any warnings when you compile the script? "Only a MouseHelmet will save you from a MouseTrap" -Jason Ross (Me) NSIS 3 POSIX Ninja Wiki Profile

13th January 2016, 21:11	#6
Anders Moderator Join Date: Jun 2002 Location: ${NSISDIR} Posts: 5,442	Open probably means some application is using it. I don't understand how this can be so hard to test, since you are checking for ports I assume you have some application that opens a port so you can just run it and test your installer. You can also use netstat or download TCPView to find open ports on your machine... IntOp $PostCount $PostCount + 1

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13th January 2016, 00:09	#3
pkonduru Member Join Date: Jul 2015 Posts: 62	The installation proceeds no matter what port I give. Is there any port on my Windows machine I can specify where this check will fail and abort?

13th January 2016, 18:09	#5
pkonduru Member Join Date: Jul 2015 Posts: 62	Hi Jason, Yes I do have a ${EndIf}, didnt post the whole snippet, here it is: ${If} ${TCPPortOpen} $PortNumber MessageBox MB_OK\|MB_ICONSTOP "$PortNumber is already using by another program..." Abort ${Else} MessageBox MB_OK "$PortNumber is open to use" ${EndIf} what I don't get is , if the Port is open as per this line below, ${If} ${TCPPortOpen} $PortNumber Doesn't this mean that the port is OK to use and proceed with the install?

14th January 2016, 21:32	#7
pkonduru Member Join Date: Jul 2015 Posts: 62	Thanks Anders. My understanding was "TCPPortOpen" meant an "Open" port which one could use, sorry for the confusion. I did verify that the code is working by entering a port which was in use by the application. Thank you everyone for the inputs.