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



any help would be useful, thanks

This might help you:


-Stu

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

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

Good idea lol

-Stu

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.

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 🙂

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

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)