Ncat Windows send-only file EOF problem

[Andy Zwirko <andy.zwirko () gmail com>]

Good day - I'm having a similar problem to:

http://seclists.org/nmap-dev/2009/q3/605

There was no resolution last year, just a response that it couldn't be
reproduced.

The issue I'm having is when running ncat 5.21 on Windows XP SP3 it
does not close the connection upon EOF when sending a file using the
--send-only option.   I've reproduced this on several Windows XP SP3
machines under cmd.exe.

Here's my output:

RECEIVER:
H:\>ncat -vvv -l > newfile
Ncat: Version 5.21 ( http://nmap.org/ncat )
Ncat: Listening on 0.0.0.0:31337
NCAT DEBUG: Initialized fdlist with 102 maxfds
NCAT DEBUG: Added fd 1936 to list, nfds 1, maxfd 1936
NCAT DEBUG: Added fd 0 to list, nfds 2, maxfd 1936
NCAT DEBUG: Initialized fdlist with 100 maxfds
NCAT DEBUG: selecting, fdmax 1936
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 1936 is ready
Ncat: Connection from 127.0.0.1.
NCAT DEBUG: Added fd 1900 to list, nfds 3, maxfd 1936
NCAT DEBUG: Added fd 1900 to list, nfds 1, maxfd 1900
NCAT DEBUG: selecting, fdmax 1936
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 1900 is ready
NCAT DEBUG: selecting, fdmax 1936
NCAT DEBUG: select returned 1 fds ready
NCAT DEBUG: fd 1900 is ready
NCAT DEBUG: selecting, fdmax 1936

SENDER
C:\Program Files\Nmap>ncat --send-only localhost -vvv <  ZENMAP_README
Ncat: Version 5.21 ( http://nmap.org/ncat )
NSOCK (0.2030s) TCP connection requested to 127.0.0.1:31337 (IOD #1) EID 8
NSOCK (0.2030s) Callback: CONNECT SUCCESS for EID 8 [127.0.0.1:31337]
Ncat: Connected to 127.0.0.1:31337.
NSOCK (0.2030s) Read request for 0 bytes from IOD #2 (peer unspecified) EID 18
NSOCK (0.2180s) Callback READ SUCCESS for EID 18 (peer unspecified) (2048 bytes)
NSOCK (0.2180s) Write request for 2048 bytes to IOD #1 EID 27 [127.0.0.1:31337]
NSOCK (0.2180s) Callback: WRITE SUCCESS for EID 27 [127.0.0.1:31337]
NSOCK (0.2180s) Read request for 0 bytes from IOD #2 (peer unspecified) EID 34
NSOCK (0.2180s) Callback READ SUCCESS for EID 34 (peer unspecified) (212 bytes)
NSOCK (0.2180s) Write request for 212 bytes to IOD #1 EID 43 [127.0.0.1:31337]
NSOCK (0.2340s) Callback: WRITE SUCCESS for EID 43 [127.0.0.1:31337]
NSOCK (0.2340s) Read request for 0 bytes from IOD #2 (peer unspecified) EID 50

I can Ctrl-C on the sender to end the connection and that closes the
receiver, but otherwise the two will just sit and hang there waiting.
If I Ctrl-C the file did seem to transfer OK and are identical in
size.

SENDER dir
01/26/2010  09:11 PM             2,260 ZENMAP_README

RECEIVER dir
02/26/2010  12:37 PM             2,260 newfile

Thanks for your time.

andyz
_______________________________________________
Sent through the nmap-dev mailing list
http://cgi.insecure.org/mailman/listinfo/nmap-dev
Archived at http://seclists.org/nmap-dev/