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List:       freebsd-hackers
Subject:    Re: how to write a raw socket server using UDP
From:       "H.fazaeli" <fazaeli () sepehrs ! com>
Date:       2007-11-28 13:59:25
Message-ID: 474D716D.3060907 () sepehrs ! com
[Download RAW message or body]


the 2 most common cause for sendto() failure on raw sockets are:

- badly initialized IP header. note that ip_len and ip_off must be in
  host byte order. all other fields must be in net byte order.
- badly initialized destination address.

writing a raw socket server is not much different than other socket
servers:

 s = socket(AF_INET, SOCK_RAW, 0);
 if (bind(s, ...) != 0)
    errx(...)
 while (1)
     recvfrom(s, ...)
     /* recv buffer contains a packet starting with IP header */
 


sourav das wrote:
> hello all,
>
>      i m a new comer. i wrote a raw socket client 
> using setsockopt (sock, IPPROTO_IP. IPHDRINCL, ....)using UDP. ihave followed 
> MS_Press network programming . it is showing 19 bytes sent successfully. when 
> trying to send more than 19 bytes using     sendto(sock, ...) function , it is 
> showing socket error on sending. i want to know how to write a raw socket server 
> program so that to catch and display the data sent by the  client.
>
>  
>
> thanks a lot,
>
> keep fit,
>
>  
>
> regards,
>
> spike.
>
>
>
>
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