#include <stdio.h>

#include <arpa/inet.h>

#include "packet.h"

namespace packet {

  void parse(uint8_t const * buf, int length, packet * p)
  {
    //////////////////////////////////////////////////////////////////////
    // eth
    //////////////////////////////////////////////////////////////////////

    eth::header const * eth_header = reinterpret_cast<eth::header const *>(&buf[eth_offset]);

    //printf("eth source address ");
    //print_eth_address(eth_header->source_address);
    //printf("eth destination address ");
    //print_eth_address(eth_header->destination_address);

    //////////////////////////////////////////////////////////////////////
    // ip4
    //////////////////////////////////////////////////////////////////////

    ip4::header const * ip4_header = reinterpret_cast<ip4::header const *>(&buf[ip4_offset]);
    //printf("ip4 total length: %d\n", ntohs(ip4_header->total_length));
    assert(ip4_offset + ntohs(ip4_header->total_length) == length);

    printf("ip4 source address: %s\n", ip4::tostr(ip4_header->source_address));
    printf("ip4 destination address: %s\n", ip4::tostr(ip4_header->destination_address));

    //////////////////////////////////////////////////////////////////////
    // udp4
    //////////////////////////////////////////////////////////////////////

    udp4::header const * udp4_header = reinterpret_cast<udp4::header const *>(&buf[udp4_offset]);
    //printf("udp4 length: %d\n", ntohs(udp4_header->length));
    assert(udp4_offset + ntohs(udp4_header->length) == length);

    //////////////////////////////////////////////////////////////////////
    // dhcp4
    //////////////////////////////////////////////////////////////////////

    dhcp4::message const * dhcp4_message = reinterpret_cast<dhcp4::message const *>(&buf[dhcp4_offset]);
    uint8_t const * dhcp4_options = dhcp4_message->options;
    //printf("dhcp4 cookie %02x %02x %02x %02x\n", dhcp4_options[0], dhcp4_options[1], dhcp4_options[2], dhcp4_options[3]);
    assert(dhcp4_options[0] == 0x63 &&
           dhcp4_options[1] == 0x82 &&
           dhcp4_options[2] == 0x53 &&
           dhcp4_options[3] == 0x63);

    //////////////////////////////////////////////////////////////////////
    // packet
    //////////////////////////////////////////////////////////////////////

    p->eth = eth_header;
    p->ip4 = ip4_header;
    p->udp4 = udp4_header;
    p->dhcp4 = dhcp4_message;
  }
}