ncat usage

[Dave Henderson <dhenderson () digital-pipe com>]

Good afternoon gang!  I'm working on a project that currently uses 
Berkley's netcat (nc), however, during some research I stumbled on 
ncat.  I can see that it's much more comprehensive so I'd like to make 
the switch to using it instead, but I can't seem to get it working 
right.  The project is basically a bash version of a web server.  I'll 
post the working code below.  Any help would greatly be appreciated!

Thanks,
Dave



while (( 1 == 1 )); do                # causes an infinite loop for 
processing requests
    #nc -Cl $sOPTS "$iPORT" < "$SI" > "$SO" 2>>/tmp/debug.txt &   # 
netcat-openbsd - DEBUGGING ERRORS/MESSAGES
    nc -Cl $sOPTS "$iPORT" < "$SI" > "$SO" &                            
         # netcat-openbsd
    #ncat $sOPTS -vvv -C -l 127.0.0.1 $iPORT < "$SI" > "$SO" &        # 
ncat

    trap exitGraceful SIGINT                                    # traps 
ctrl-C to exit this script
    head -n 1 "$SO" | procRequest > "$SI"
    trap - SIGINT
done



Basically the above 'while' loop cycles for every request submitted 
causing netcat to process the request and then restart.  Currently the 
webpages are being served using nc, but when I switch to ncat, I get the 
following (verbose) output at the command prompt, but no webpage ever 
comes up in the browser:

Ncat: Version 5.21 ( http://nmap.org/ncat )
Ncat: Listening on 127.0.0.1:80
NCAT DEBUG: Initialized fdlist with 102 maxfds
NCAT DEBUG: Added fd 3 to list, nfds 1, maxfd 3
NCAT DEBUG: Added fd 0 to list, nfds 2, maxfd 3
NCAT DEBUG: Initialized fdlist with 100 maxfds
NCAT DEBUG: selecting, fdmax 3
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 3 is ready
Ncat: Connection from 127.0.0.1.
NCAT DEBUG: Added fd 4 to list, nfds 3, maxfd 4
NCAT DEBUG: Added fd 4 to list, nfds 1, maxfd 4
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 4 is ready
NCAT DEBUG: selecting, fdmax 4
Mon May  7 19:22:41 UTC 2012    INFO    Executing 
./modules/cdb/default.sh script
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: selecting, fdmax 4
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 0 is ready
NCAT DEBUG: EOF on stdin
NCAT DEBUG: selecting, fdmax 4


It looks like the correct script gets called (./modules/cdb/default.sh), 
but again, nothing comes back to the browser.  Any ideas about what 
might be happening? Perhaps something is going wrong in the I/O 
redirection...  Thanks for any help!

Dave

PS.
   Is there a way to have ncat remain running (-k) and simulate EOF so 
that the connection to the script and browser is closed correctly?
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