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Description of problem:
ncat does not write the session data to output file when the protocol is UDP

Version-Release number of selected component (if applicable):
nmap-5.51-1.el6.x86_64

How reproducible:
always

Steps to Reproduce:
# ncat --udp --output ncatudp.log --listen 6666
TEST
^C
# ls -l ncatudp.log
-rw-r--r--. 1 root root 0 May 30 18:06 ncatudp.log

In this test the following command was used to send data to the server:
# echo TEST | ncat --udp localhost 6666
 
Actual results:
the output file is empty

Expected results:
# ncat --output ncattcp.log --listen 6666
TEST
^C
# cat ncattcp.log 
TEST

reproducible in both rhel and latest fedora

Created attachment 592879 [details]
patch to fix this

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

http://rhn.redhat.com/errata/RHBA-2013-0881.html