connect to SMTP port on remote name/ip, return 1 or 0

shaunb · 26th May 2006, 09:50

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, 10:29

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

-Stu

shaunb · 26th May 2006, 10:33

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, 12:25

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

Afrow UK · 28th May 2006, 17:10

Good idea lol

-Stu

nandhp · 28th May 2006, 19:56

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, 20:35

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, 08:03

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, 09:15

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

26th May 2006, 09:50	#1
shaunb Member Join Date: May 2006 Location: Devon, UK Posts: 65	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

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26th May 2006, 10:29	#2
Afrow UK Moderator Join Date: Nov 2002 Location: Surrey, England Posts: 8,434	This might help you: http://faq.siteground.com/faq/email_port25.htm -Stu

26th May 2006, 10:33	#3
shaunb Member Join Date: May 2006 Location: Devon, UK Posts: 65	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

28th May 2006, 12:25	#4
OldGrumpy Member Join Date: Feb 2006 Location: Germany Posts: 53	You don't have to check for the server reply, just for "connect failed" from telnet...

28th May 2006, 17:10	#5
Afrow UK Moderator Join Date: Nov 2002 Location: Surrey, England Posts: 8,434	Good idea lol -Stu

28th May 2006, 19:56	#6
nandhp Junior Member Join Date: Feb 2004 Location: Mars Posts: 20	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.

29th May 2006, 20:35	#7
OldGrumpy Member Join Date: Feb 2006 Location: Germany Posts: 53	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

30th May 2006, 08:03	#8
shaunb Member Join Date: May 2006 Location: Devon, UK Posts: 65	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

30th May 2006, 09:15	#9
shaunb Member Join Date: May 2006 Location: Devon, UK Posts: 65	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