Replaying a TCP connection

[neha agrawal]

hello!

        i want to implement smtp protocol on the same
machine.i have a libpcap trace file..in which i have
captured mail traffic..(single session).and i want to
develop a program which can read this trace file..and
communicate with the smtp server...
    first packet is Sync packet in trace file..so i
want to send it to smtp server...and then i want my
progrem to handle the reply sent by server..(say it
sent Syn-Ack) anf then my prgm should reply
accordingly..
       for doing this i am using PF_PACKET , SOCK_RAW
and using sendto function...i am sending the
packet..im able to see it through tcpdump...but
theserver is not replying...why??i am wrking with
linux Redhat 9 kernel 2.4.20-8
     
       (...if u r familiar with flowreplay tool..i
want to do something similar ...but mine is single
session..so less complicated...)

    attching source code...

 do let me know..if i am on correct track...
                                          thnks
                                           Neha


		
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