Find open ports in Windows

From http://www.techrepublic.com

http://www.techrepublic.com/blog/security/list-open-ports-and-listening-services/443

Microsoft Windows XP

Microsoft Windows also offers anetstatcommand that can be executed from the command line to get a list of open ports. The standard MS Windows version ofnetstatis slightly more limited than its Unix-like system counterparts, but still suffices to get a listing of listening services:

  netstat -a | find "LISTENING"

The output of this command should look something like this:

TCP    hostname:epmap           hostname:0               LISTENING
TCP    hostname:microsoft-ds    hostname:0               LISTENING
TCP    hostname:10110           hostname:0               LISTENING
TCP    hostname:netbios-ssn     hostname:0               LISTENING

. . . with “hostname” replaced by the system’s hostname, of course.

Path.Combine() - this is just stupid....

In my DRC project, I found a bug specifically caused by incorrect file path.

My approach was the Base folder path in my app.config / Settings and then use relative paths for all the resources  I need to store in a database.  Seems like a solid plan.   Actually, been using this approach for 10+ years now... what went wrong?

Recently, I've been using Resharper tool to tighten up my code.  During my review of the code, I found where I had some manually concatenated paths using string.Format().  With an eye to porting my application to iOS or Android using Mono, I thought building paths from simple strings simply won't do.  Better to use System.IO.Path.Combine() right?

Wrong!  After converting this code to use Path.Combine() errors occurred.  Impossible I thought, the paths are correct.  I found this issue on StackOverflow:


Why Does Path.Combine not properly concatenate filenames that start with Path.DirectorySeparatorChar

In my testing I found this:

Path path + subfolder + file name

System.IO.Path.Combine(@"C:\DRC_Data","USA","48cnty.dbf")
"C:\\DRC_Data\\USA\\48cnty.dbf"   - PASS


System.IO.Path.Combine(@"C:\DRC_Data\","USA","48cnty.dbf")
"C:\\DRC_Data\\USA\\48cnty.dbf" + PASS


System.IO.Path.Combine(@"C:\DRC_Data",@"USA",@"\48cnty.dbf")
"\\48cnty.dbf" - FAIL



System.IO.Path.Combine(@"C:\DRC_Data\",@"\USA","48cnty.dbf")
"\\USA\\48cnty.dbf" - FAIL


System.IO.Path.Combine(@"C:\DRC_Data\",@"USA",@"\48cnty.dbf")
"\\48cnty.dbf" = FAIL


System.IO.Path.Combine(@"C:\DRC_Data\",@"\USA\",@"48cnty.dbf")
"\\USA\\48cnty.dbf" - FAIL

Now, I'm not going to declare Path.Combine() useless for building paths with relative elements but there needs to a an option set for Path.Combine() does not assume every element that starts with a backslash as a start of a root path.

Path.Combine() works as per spec but it's not what I would have expected either.
Bottom line, it is a helper function that should be more helpful!










 

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