defs.h

Linux系统下的简单sniffer程序代码

#include <netinet/ip.h>
#include <netinet/tcp.h>
#include <netinet/udp.h>
#include <netinet/ip_icmp.h>

#define PLS 4096		/* payload size */

struct ip_tcp_pkt
{
 struct ip iph;
 struct tcphdr icmph;
 char   payload[PLS];
} tcp_packet;

struct ip_udp_pkt
{
 struct ip iph;
 struct udphdr udph;
 char   payload[PLS];
} udp_packet;

struct ip_icmp_pkt 
{
 struct ip iph;
 struct icmp icmph;
 char   payload[PLS];
} icmp_packet;