How to validate hostname (may be IP) and port number (CString)

Question

I have an dialog for HTTP proxy configuration with hostname and port edit boxes.

My question is how can I validate user input for correct hostname and port?

May be I have to use some regular expression for hostname validation or there is some helpful MFC or WinAPI function? What is the maximum correct number for port?

This question is in serious need of more information in order to give helpful answers. — Eran Rehavi, Jun 23 '09 at 15:36

Shay Erlichmen · Accepted Answer · 2009-06-23T21:18:39.047

11

Port number is an unsigned short from 1-65535, ports under 1024 are reserved for system services http, ftp, etc.
I don't believe that you can validate host name (or should) especially when you have locallized host names.

edited Jun 23 '09 at 21:18

answered Jun 23 '09 at 20:49

Shay Erlichmen

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Privileged ports are those below 1024, not 256. – mseery Jun 23 '09 at 20:56

score 2 · Answer 2 · answered Jan 11 '14 at 16:02

You can use Apache Commons Validator's InetAddressValidator. Check out http://commons.apache.org/proper/commons-validator/apidocs/org/apache/commons/validator/routines/InetAddressValidator.html.

That project has many validator utilities you can reuse. Hope it helps.

How to validate hostname (may be IP) and port number (CString)

2 Answers2