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Full Discussion: Help with sed to add delimiter to send HEX with netcat
Top Forums Shell Programming and Scripting Help with sed to add delimiter to send HEX with netcat Post 302584577 by patx on Friday 23rd of December 2011 06:01:32 PM
Old 12-23-2011
Help with sed to add delimiter to send HEX with netcat
Hello,

I want to send tcpflow dump to a TCP port in HEX data, to send with netcat i need to convert to HEX and add \\x before each HEX bytes, to do this i use this line:
Code:
tcpflow -i [interface] -C dst port [port] | xxd -p | sed 's/../&\\\\x/g;s/ $//' | nc [host] [port]

the output on the listening end:
Code:
2e\\x2e\\x2e\\x2e\\x54\\x0d\\x22\\x2e\\x2e\\x24\\x52\\x2e\\x2e\\x21\\x2e\\x2e\\x2e\\x2e\\x2e\\x66\\x

The problem is that the \\x delimiter is not added for the first byte as shown above...

thankx for your help.
 

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LEARN ABOUT DEBIAN

ldns-notify

ldns-notify(1)						      General Commands Manual						    ldns-notify(1)

NAME

       ldns-notify - notify DNS servers that updates are available

SYNOPSIS

       ldns-notify [options] -z zone servers

DESCRIPTION

       ldns-notify  sends a NOTIFY message to DNS servers. This tells them that an updated zone is available at the master servers. It can perform
       TSIG signatures and it can add a SOA serial number of the updated zone.	If a server already has that serial number it will  disregard  the
       message.

OPTIONS

       -z zone
	      The zone that is updated.

       -h     Show usage and exit

       -v     Show the version and exit

       -s serial
	      Append a SOA record indicating the serial number of the updated zone.

       -p port
	      Use port as destination port (default the DNS port 53) for the UDP packets.

       -y key:data
	      Use the given TSIG key and base64-data to sign the NOTIFY. Uses the hmac-md5 algorithm.

       -d     Print verbose debug information. The query that is sent and the query that is received.

       -r num Specify the maximum number of retries before notify gives up trying to send the UDP packet.

EXIT CODE

       The program exits with a 0 exit code if all servers replied an acknowledgement to the notify message, and a failure exit code otherwise.

AUTHOR

       Written by the ldns team as an example for ldns usage.

REPORTING BUGS

       Report bugs to <ldns-team@nlnetlabs.nl>.

COPYRIGHT

       Copyright  (C)  2005 NLnet Labs. This is free software. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR-
       POSE.

								    9 Jan 2007							    ldns-notify(1)
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