mask.c

linux 下用libcap包写的抓包程序 很好的参考学习资料

#include<stdio.h>
#include<pcap.h>
typedef u_int32_t in_addr_t;
struct in_addr
{
	in_addr_t s_addr;
};
int main()
{
	char error_content[PCAP_ERRBUF_SIZE];
	struct in_addr net_ip_address;
	struct in_addr net_mask_address;
	char *net_interface;
	char *net_ip_string;
	char *net_mask_string;
	u_int32_t net_ip;
	u_int32_t net_mask;
	net_interface=pcap_lookupdev(error_content);
	pcap_lookupnet(net_interface,
		       &net_ip,
		       &net_mask,
		       error_content);

	printf("Network Interface is:%s\n",net_interface);
	net_ip_address.s_addr=net_ip;
	net_ip_string=(char*)inet_ntoa(net_ip_address);
	printf("Network IP Address is:%s\n",net_ip_string);
	net_mask_address.s_addr=net_mask;
	net_mask_string=(char*)inet_ntoa(net_mask_address);
	printf("Network Mask Address is:%s\n",net_mask_string);
}