int
recv_address (int code, void *closure,
struct sockaddr_in *dest, struct sockaddr_in *from,
struct ip *ip, icmphdr_t * icmp, int datalen)
{
switch (code)
{
case PEV_RESPONSE:
case PEV_DUPLICATE:
print_address (code == PEV_DUPLICATE,
closure, dest, from, ip, icmp, datalen);
break;
case PEV_NOECHO:;
print_icmp_header (from, ip, icmp, datalen);
}
return 0;
}
/*
* Process a packet on the transport layer.
*
* @param recvsize: size of the captured data
* @param packet: packet capture data target structure
* @param raw: packet data at layer 4 entry
*/
bool process_transport_layer(size_t recvsize, struct packet* packet, byte* raw)
{
// switch over layer 4 protocol
switch( packet->transport_layer_code )
{
break;case PRO_ICMP:
if( recvsize < sizeof(struct icmphdr) )
{
printf("ERROR Received data indicates an ICMP header but it is incomplete\n");
return false;
}
extract_icmp_header( packet, raw );
print_icmp_header( packet );
break;case PRO_TCP:
if( recvsize < sizeof(struct tcphdr) )
{
printf("ERROR Received data indicates a TCP header but it is incomplete\n");
return false;
}
extract_tcp_header( packet, raw );
print_tcp_header( packet );
break;case PRO_UDP:
if( recvsize < sizeof(struct udphdr) )
{
printf("ERROR Received data indicates an UDP header but it is incomplete\n");
return false;
}
extract_udp_header( packet, raw );
print_udp_header( packet );
break;case UNKNOWN_TRANSPORT_PROTOCOL:
printf("Unknown transport layer protocol.\n");
return false;
}
return true;
}
