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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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g3tolj(1)						       mgetty+sendfax manual							 g3tolj(1)

NAME
g3tolj - converts a Group 3 fax file into a printable HP-PCL file SYNOPSIS
g3tolj [-kludge] [-reversebits] [-scale N] [-aspect N] [-resolution 75|100|150|300] [-compress 0|1|2] [-pagelength N] [-duplength N] [g3file] DESCRIPTION
Reads a Group 3 fax file (raw or digifax) as input. If no filename is given, stdin is used. Produces a printable HP-PCL file as output. OPTIONS
-kludge Tells g3tolj to skip the first lines for synchronisation. -reversebits Tells g3tolj to interpret bits least-significant first, instead of the default most-significant first. Apparently some fax modems do it one way and others do it the other way. If you get a whole bunch of "invalid code" messages, try using this flag. -scale N Scale the output to match the printer resolution and paper size, the default of 1.40 will do in most cases. -aspect N Scale the output to match the printer resolution and paper size, the default of 1.0 will do for high resolution faxes, 2.0 will do for low resolution faxes. -resolution 75|100|150|300 Selects print resolution. The default is 300. -compress 0|1|2 Selects compression method for the print output. 0 = none, 1 = rll, 2 = tiff. The default is 0. -pagelength N Defines the pagelength in inches, the default is 10.95. After this length a pagebreak is generated and the last part of the previous page is duplicated on the next page -duplength N Defines the length in inches that will be duplicated after a pagebreak, The default is 0.7. REFERENCES
The standard for Group 3 fax is defined in CCITT Recommendation T.4. BUGS
Please report bugs to chel@vangennip.nl SEE ALSO
pbmtog3(1), pbm(5), g3cat(1), sendfax(8), mgetty(1) AUTHOR
g3tolj is Copyright (C) 1994 by Chel van Gennip, <chel@vangennip.nl>. Sources of g3topbm and pbmtolj programs in Jef Poskanzers pbmplus package have been used, but al lot of code has been changed or added to simplify its use for printing faxes. Value added: low use of mem- ory, fast scaling, printing of long faxes with page breaks, print file compression (by John Watson) Chel 22 may 94 g3tolj(1)
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