shaunb
26th May 2006 10:50 UTC

connect to SMTP port on remote name/ip, return 1 or 0
I've read and searched the forums, and online, I can't seem to find a simple enough win32 command line port scanning tool, that I could nsexec and get the output to see if port 25 is open on the remote mailserver (I need to verify a user entered SMTP mailserver ip/name)

I've tried the following function to no avail, it just returns -1

http://forums.winamp.com/showthread....highlight=smtp

any help would be useful, thanks

Afrow UK
26th May 2006 11:29 UTC

This might help you:
http://faq.siteground.com/faq/email_port25.htm

-Stu

shaunb
26th May 2006 11:33 UTC

hm, I was just playing about with windows telnet just now hehe, I guess I could exec to stack and then check the result, but hmm, each mailserver responds with a slightly different welcome string.

pinging it wouldnt suffice as it might be firewalled or whatever. blarg

OldGrumpy
28th May 2006 13:25 UTC

You don't have to check for the server reply, just for "connect failed" from telnet... :)

Afrow UK
28th May 2006 18:10 UTC

Good idea lol

-Stu

nandhp
28th May 2006 20:56 UTC

Telnet is a Win32 GUI application in 95/98/ME/NT so this approach won't work on those versions. If you need something more reliable, you might want to look for a better solution.

OldGrumpy
29th May 2006 21:35 UTC

nandhp, I wasn't exactly serious, I was just pointing out a slightly faulty logical chain ;) Of course it would be better to just write a plugin that uses the winsock interface ot connect to a specified server and port :)

shaunb
30th May 2006 09:03 UTC

hmm, not really time to write my own plugin, if I had to write anything it'd be a custom console application that did the socket task. hmm

shaunb
30th May 2006 10:15 UTC

Looks like I've come up with a workable solution

using portqry.exe (version 2, available from MS's site)

firstly I nsexec a batch file that wraps the portquery.exe and provides one parameter %1 , to pass in the $CFMAILSERVER (I require to verify a coldfusion server default mailserver), anyway , using the errorlevel function of dos I can then check the exit code of portqry, and output either success or failed to my 'results file' on c:\, which I then use NSIS to read, chop a couple of bytes off the end, and use to check if the mail server verified ok!

my code is attached as its too long

edit: actually I can't find where to attach it so if anyone wants the code just send me a private message! doh!

:) I hope it'll help anyone else trying to do the same task.

The end results work quite well

(for reference)
http://www.petri.co.il/quickly_find_...open_ports.htm