uint16_t Packet::get_icmp_time_exceed_ipid()
{
if(!is_icmp())
{
return 0;
}
if(icmp_hdr->type != 11 || icmp_hdr->code != 0 || get_icmp_payload_len()==0)
{
return 0;
}
struct ip* ip_hdr = (struct ip*)(payload);
return ntohs(ip_hdr->ip_id);
}
bool Packet::is_icmp_ttl_exceeded()
{
if (!is_icmp())
{
return false;
}
else
{
if (icmp_hdr->type != 11)
{
return false;
}
else
{
return true;
}
}
}
/* for constructing a packet that is captured */
void Packet::build_pkt(const uint8_t *b, uint16_t len)
{
reset();
memcpy(buf_, b, len);
payload = buf_;
ip_hdr = (struct ip*)buf_;
if(is_tcp())
{
tcp_hdr = (struct tcphdr*)((uint8_t *)(ip_hdr) + get_ip_hdr_len());
set_payload((uint8_t *)((uint8_t *)(tcp_hdr) + get_tcp_hdr_len()));
}
else if (is_icmp())
{
icmp_hdr = (struct icmphdr*)((uint8_t *)(ip_hdr) + get_ip_hdr_len());
set_payload((uint8_t *)((uint8_t *)(icmp_hdr) + ICMP_H));
}
else
{
logger->PrintErr("[%s:%d] Only support TCP/ICMP/IP now!\n", __FILE__, __LINE__);
}
}
static bool
pred_is_icmp(arguments_t args, SkBuff b)
{
return is_icmp(b);
}