Very Computer

1. Incorrect IP header data in RAW Sockets

Hi,

I am using RAW sockets (Solaris 8) to send out a VRRP protocol packet
out to a multicast group. For some reason, I am not seeing the IP
header information that I am sending out. Instead I see TTL = 1,
Protocol=2 and etc. Can someone help me out in identifying the likely
problem in this code?

int vrrp_send_pkt( vrrp_rt *vsrv, char *buffer, int buflen )
{
        struct sockaddr_in from;
        int     len;
        int     fd = socket(AF_INET, SOCK_RAW, IPPROTO_RAW);

        if( fd < 0 ){
                perror( "socket" );
                return -1;
        }
        int on = 1;
        int geton = 1;
        int retSetSock = setsockopt(fd, IPPROTO_IP, IP_HDRINCL, &on,
sizeof(on));

        char lBuffer[72];
        struct ip ip;
        struct udphdr udphdr;

        ip.ip_hl                = 5;
        ip.ip_v = 4;
        ip.ip_tos               = 0;
        ip.ip_len       = ip.ip_hl*4 + vrrp_hd_len( vsrv );
        ip.ip_len       = htons(ip.ip_len);
        ip.ip_id                = ++ip_id;
        ip.ip_off       = 0;
        ip.ip_ttl               = VRRP_IP_TTL;
        ip.ip_p = IPPROTO_VRRP;
        ip.ip_src.s_addr = htonl(vsrv->vif.ipaddr);
        ip.ip_dst.s_addr        = htonl(INADDR_VRRP_GROUP);
        /* checksum must be done last */
        ip.ip_sum       = in_csum( (u_short*)(&ip), ip.ip_hl*4, 0 );

        memcpy(lBuffer+sizeof(ip), &udphdr, sizeof(udphdr));
        /* build the address */
        memset( &from, 0 , sizeof(from));
        //strcpy( from.sa_data, vsrv->vif.ifname );
        /* send the data */
        from.sin_family = AF_INET;
        from.sin_addr.s_addr=inet_addr("224.0.0.18");
        from.sin_port=htonl(5000);
        len = sendto( fd, &ip, 40, 0, (struct sockaddr *) &from,
sizeof(from) );
printf("len=%d\n",len);
        close( fd );
        return len;

Thanks,
Devender

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