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Reading the packet information through libipq

Posted on 2003-12-03
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Last Modified: 2011-09-20


  Hi !

I was running the sample code given in the manpage of libipq
Except for the inclusion os stdlib.h for exit() and the removal of formal parameters from main i have made no modifications..............the program worked well............

   But then when i wanted it to print the hardware address,
             printf("%s", m->hw_addr) ; it prints a nothing.........

 similarly with other packet information members of the structure :
ipq_packet_msg-t  i.e.,
 printf("%l", m->timestamp_sec);

except :
     m->packet_id and m->data_len was being printed with some values.............

i believe it is because the kernel had entered these information on its own...the rest of the members have to have values from the packet itself...................
   Is my printf format wrong......what may be the reason that these structure member values are null for me............






 
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Question by:Anu_Suthakaran
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scn earned 100 total points
ID: 9868887
hw_addr and hw_addrlen apply to the incoming network interface. So, it will be set only if your packet comes from another host.
hw_addr isn't a string but an array of bytes: loop for hw_addrlen iterations and print a byte at each iter.
timestamp_sec is of type int64_t, being 'long long' so printf with format "%lld"
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