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Full Discussion: Creating a printer emulator to capture PDL/PCL data coming in on port 9100.
Special Forums IP Networking Creating a printer emulator to capture PDL/PCL data coming in on port 9100. Post 302389077 by transistor on Friday 22nd of January 2010 02:32:37 PM
Old 01-22-2010
Thanks, Corona.

I tried using Windump - a port of tcpdump - to see if I could catch anything. I set it to listen for incoming on port 9100 but couldn't see anything. (I could see traffic if I listened for other devices on the LAN.) This caused me to think that the stream might be interactive.

Any other ideas? I'll mess around with tcpdump/Windump between to laptops and see if I can understand how it's supposed to work.

---------- Post updated at 07:32 PM ---------- Previous update was at 06:49 PM ----------

Right. Two XP laptops.

Source: 192.168.3.3, with a generic/text printer driver pointing to 192.168.3.4, port 9100.
Dest: 192.168.3.4 (Hohner) running WinDump. WinDump listening to port 9100.

Here's what I got when I try to print "Hallo World!" from Notepad on source machine ...

Code:
E:\windump>windump -i 2 -A -f -q -t -X port 9100
windump: listening on \Device\NPF_{8071A9D5-8999-472A-85C5-B1E55ABFFC9E}
IP 192.168.3.3.1982 > HOHNER.9100: tcp 0
        0x0000:  4500 0030 6b7d 4000 8006 07f3 c0a8 0303  E..0k}@.........
        0x0010:  c0a8 0304 07be 238c 7ebb 2438 0000 0000  ......#.~.$8....
        0x0020:  7002 ffff 2dee 0000 0204 0550 0101 0402  p...-......P....
IP 192.168.3.3.1983 > HOHNER.9100: tcp 0
        0x0000:  4500 0030 6b83 4000 8006 07ed c0a8 0303  E..0k.@.........
        0x0010:  c0a8 0304 07bf 238c 3334 eff4 0000 0000  ......#.34......
        0x0020:  7002 ffff adb7 0000 0204 0550 0101 0402  p..........P....

It keeps repeating this and the print queue on source machine never clears. It looks like the source is expecting a response from dest.

Any ideas how to spoof a response from the "printer"?
Am I mad?
Last edited by transistor; 01-22-2010 at 03:46 PM.. Reason: Improved clarity - I hope!
 

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LEARN ABOUT CENTOS

foomatic-getpjloptions

FOOMATIC-GETPJLOPTIONS(8)				      System Manager's Manual					 FOOMATIC-GETPJLOPTIONS(8)

NAME

       foomatic-getpjloptions - <put a short description here>

SYNOPSIS

       foomatic-getpjloptions device

       foomatic-getpjloptions hostname port

DESCRIPTION

       foomatic-getpjloptions  Sends  a  set of PJL commands and reads back the PJL options and status from a printer over a network connection or
       device bidirectional interface such as parallel, USB, serial.  printers to standard output. The output can be piped into foomatic-addpjlop-
       tions to add options to the database.

   Options
       device	 The interface to which a local printer is connected, e.g. /dev/lp0, /dev/usb/lp0, /dev/tty00, etc.  For a parallel port, you must
		 have bidirectional support enabled at the BIOS level and the parallel port driver must support  the  bidirectional  mode.   Check
		 your parallel port BIOS settings for  EPP/bi-directional mode.

       hostname  Host name or IP address of a network printer (HP JetDirect, DLINK, etc.).

       port	 Port  on  which  your	network printer listens for socket (Appsocket) connections.  Most common ports are 9100 (JetDirect), 10000
		 (DLINK).  Usually you can configure the port via a configuration interface.

EXIT STATUS

       foomatic-getpjloptions returns ???

AUTHOR

       Manfred Wassmann <manolo@NCC-1701.B.Shuttle.de> for the foomatic project using output from the associated binary.  Modified by Patrick Pow-
       ell <papowell at lprng.com> to provide betters support for network printers, error messages, and remove CR and FF from output.

WARNINGS

       Uni-directional	protocols  as remote LPD are not supported as no status is returned.  Some network print servers which attach to a printer
       parallel port do not support bidirectional mode.

Foomatic Project						    2001-05-07						 FOOMATIC-GETPJLOPTIONS(8)
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