Kind of reverse engineering Post: 302773877

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Operating Systems Linux Kind of reverse engineering Post 302773877 by Smiling Dragon on Friday 1st of March 2013 12:43:26 AM

03-01-2013

Registered User

I'd say that you would want to trace the program. On linux, the strace and ptrace commands would be the tools of choice I'd say. I typically use strace with the '-f' flag to instruct it to follow any child processes it starts.

You'll be able to see any raw writes and reads to the serial device.

To get deeper and actually capture the exact data flow, you'd likely need to create a named pipe, connect that to a script that just dumps all data it seems and then passes it on to the serial port, then point the code you are reverse engineering at your new dummy "serial port" device.

You might also be able to do something crafty with a windows PC and two serial ports. Connect one to the linux host, the other to the STB. Then write a short program to capture all serial traffic on either port, and send it to the other - ie a packet sniffer for serial traffic.
(I say windows just because it sounds like you are more comfortable coding on that)

Smiling Dragon

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statserial

STATSERIAL(1)							   User Commands						     STATSERIAL(1)

NAME

       statserial - display serial port modem status lines

SYNOPSIS

       statserial [-n |  -d | -x] <device-name>

DESCRIPTION

       Statserial displays a table of the signals on a standard 9-pin or 25-pin serial port, and indicates the status of the handshaking lines. It
       can be useful for debugging problems with serial ports or modems.

       The optional device-name parameter is the full name of the device file for the serial port in question. If not specified,  the  default	is
       taken from the environment variable MODEM if set, otherwise /dev/cua1.

COMMAND-LINE OPTIONS
       Each of the command line options is mutually exclusive.

       -n   Normally  statserial  will loop continuously, updating the status at one second intervals; you can exit using Control-C. The -n option
	    disables looping.

       -d

	    With this option the status of the modem is printed as a decimal number. The bits are encoded as follows (XXX indicates unused bits):

	    +---+---+---+---+---+---+---+---+---+
	    | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
	    +---+---+---+---+---+---+---+---+---+
	    |DSR|RI |DCD|CTS|XXX|XXX|RTS|DTR|XXX|
	    +---+---+---+---+---+---+---+---+---+

       -x   This option is the same as -d, except that the output is in hexadecimal.

BUGS
/LIMITATIONS
       Statserial only works with devices that support the TIOCMGET ioctl.

       You need permission to read the device file.

       The device file may be locked if other applications are using it.

AUTHOR

       Statserial was written by Jeff Tranter (Jeff_Tranter@Mitel.COM), later updated by Frank Baumgart (godot@uni-paderborn.de) and  is  released
       under the conditions of the GNU General Public License.	See the file COPYING and notes in the source code for details.

SEE ALSO

       setserial(8) stty(1)
       /usr/src/linux/drivers/char/serial.c /usr/include/linux/termios.h

Linux								 17 December 1994						     STATSERIAL(1)