Nmap Development mailing list archives
ncat usage
From: Dave Henderson <dhenderson () digital-pipe com>
Date: Mon, 07 May 2012 15:34:06 -0400
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, Davewhile (( 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 doneBasically 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 4Mon 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 4It 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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Current thread:
- ncat usage Dave Henderson (May 07)
- Re: ncat usage David Fifield (May 07)
- Re: ncat usage Dave Henderson (May 07)
- Re: ncat usage Dave Henderson (May 09)
- Re: ncat usage James Rogers (May 09)
- Re: ncat usage Dave Henderson (May 09)
- Re: ncat usage James Rogers (May 09)
- Re: ncat usage Dave Henderson (May 09)
- Re: ncat usage James Rogers (May 09)
- Re: ncat usage Dave Henderson (May 10)
- Re: ncat usage James Rogers (May 10)
- Re: ncat usage Dave Henderson (May 07)
- Re: ncat usage David Fifield (May 07)