#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<netinet/ip_icmp.h>
#include<netinet/tcp.h>
#include<netinet/udp.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#include<sys/types.h>
#define BUFFSIZE 1024
int main(){
int rawsock;
char buff[BUFFSIZE];
int n;
int count = 0;
rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_TCP);
// rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_UDP);
// rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
// rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_RAW);
if(rawsock < 0){
printf("raw socket error!\n");
exit(1);
}
while(1){
n = recvfrom(rawsock,buff,BUFFSIZE,0,NULL,NULL);
if(n<0){
printf("receive error!\n");
exit(1);
}
count++;
struct ip *ip = (struct ip*)buff;
printf("%5d %20s",count,inet_ntoa(ip->ip_src));
printf("%20s %5d %5d\n",inet_ntoa(ip->ip_dst),ip->ip_p,ntohs(ip->ip_len));
printf("\n");
}
}
所有IP的所有port都能接收
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<netinet/ip_icmp.h>
#include<netinet/tcp.h>
#include<netinet/udp.h>
#include<arpa/inet.h>
#include<sys/socket.h>
#include<sys/types.h>
#define BUFFSIZE 1024
int main(){
int rawsock;
char buff[BUFFSIZE];
int n;
int count = 0;
rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_TCP);
// rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_UDP);
// rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_ICMP);
// rawsock = socket(AF_INET,SOCK_RAW,IPPROTO_RAW);
if(rawsock < 0){
printf("raw socket error!\n");
exit(1);
}
while(1){
n = recvfrom(rawsock,buff,BUFFSIZE,0,NULL,NULL);
if(n<0){
printf("receive error!\n");
exit(1);
}
count++;
struct ip *ip = (struct ip*)buff;
unsigned short dst_port;
memcpy(&dst_port, buff + 22, sizeof(dst_port));
dst_port = ntohs(dst_port);
if (5000 == dst_port || 6000 == dst_port)
{
printf("%5d %20s",count,inet_ntoa(ip->ip_src));
printf("%20s %5d %5d and port %d \n",inet_ntoa(ip->ip_dst),ip->ip_p,ntohs(ip->ip_len), dst_port);
printf("\n");
}
}
}
[root@bogon raw-sockets-example]# ./sniffer 730 10.10.16.82 10.10.16.81 6 60 and port 6000 838 10.10.16.82 10.10.16.81 6 60 and port 6000 991 10.10.16.82 10.10.16.81 6 60 and port 6000 1359 10.10.16.82 10.10.16.81 6 60 and port 5000 1360 10.10.16.82 10.10.16.81 6 52 and port 5000 1473 10.10.16.82 10.10.16.81 6 57 and port 5000 1610 10.10.16.82 10.10.16.81 6 57 and port 5000 1956 10.10.16.82 10.10.16.81 6 57 and port 5000 4035 10.10.16.82 10.10.16.81 6 52 and port 5000 4414 10.10.16.1 10.10.16.81 6 60 and port 6000 4480 10.10.16.1 10.10.16.81 6 60 and port 6000 5938 10.10.16.1 10.10.16.81 6 60 and port 5000 5939 10.10.16.1 10.10.16.81 6 52 and port 5000 6167 10.10.16.1 10.10.16.81 6 57 and port 5000 6229 10.10.16.1 10.10.16.81 6 57 and port 5000 6271 10.10.16.1 10.10.16.81 6 57 and port 5000 6309 10.10.16.1 10.10.16.81 6 57 and port 5000 6343 10.10.16.1 10.10.16.81 6 57 and port 5000 6401 10.10.16.1 10.10.16.81 6 54 and port 5000 6403 10.10.16.1 10.10.16.81 6 52 and port 5000 6404 10.10.16.1 10.10.16.81 6 52 and port 5000