数组方式封包
#include <iostream>
#include <sys/socket.h>
#include <netinet/ether.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <net/if.h>
#include <netpacket/packet.h>
#include <cstring>
#include <sys/ioctl.h>
#include <pthread.h>
using namespace std;
void *recv_from(void* arg)
{
int sockfd = *(int*)arg;
while(1)
{
unsigned char buf[1500] = "";
recvfrom(sockfd,buf,sizeof(buf),0,NULL,NULL);
if(ntohs(*((unsigned short*)(buf+12))) == 0x0806)
{
if(ntohs(*(unsigned short*)(buf+20)) == 0x02)
{
unsigned char temp_ip[] = {192,168,243,1};
if(memcmp((buf+28),temp_ip,4) == 0){
char dest_MAC[18] = "";
sprintf(dest_MAC,"%02x:%02x:%02x:%02x:%02x:%02x",buf[6],buf[7],buf[8],buf[9],buf[10],buf[11]);
char dest_IP[16] = "";
sprintf(dest_IP,"%d.%d.%d.%d",buf[28],buf[29],buf[30],buf[31]);
cout << dest_MAC << endl;
cout << dest_IP << endl;
break;
}
}
}
}
return NULL;
}
int main()
{
int sockFd = socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL));
if(sockFd < 0)
{
perror("socket error");
return -1;
}
unsigned char msg[] = {
0xff,0xff,0xff,0xff,0xff,0xff,
0x00,0x0c,0x29,0xee,0x18,0x53,
0x08,0x06,
0x00,0x01,
0x08,0x00,
0x06,
0x04,
0x00,0x01,
0x00,0x0c,0x29,0xee,0x18,0x53,
192,168,243,128,
0x00,0x00,0x00,0x00,0x00,0x00,
192,168,243,1
};
struct ifreq ethreq;
strncpy(ethreq.ifr_ifrn.ifrn_name,"ens33",IFNAMSIZ);
if(-1 == ioctl(sockFd,SIOCGIFINDEX,ðreq))
{
perror("ioctl error");
return -2;
}
struct sockaddr_ll sll;
bzero(&sll,sizeof(sll));
sll.sll_ifindex = ethreq.ifr_ifru.ifru_ivalue;
pthread_t tid;
pthread_create(&tid,NULL,recv_from,(void*)&sockFd);
sendto(sockFd,msg,sizeof(msg),0,(struct sockaddr*)&sll,sizeof(sll));
pthread_join(tid,NULL);
close(sockFd);
return 0;
}
结构体方式封包
struct arphdr
所在位置: /usr/include/net/if_arp.h #include <net/if_arp.h>
#include <iostream>
#include <net/if_arp.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <cstring>
#include <sys/ioctl.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netpacket/packet.h>
#include <unistd.h>
#include <pthread.h>
using namespace std;
void * recvThread(void * arg)
{
int sockfd = *(int*)arg;
while(true)
{
unsigned char buf[1500] = "";
recvfrom(sockfd,buf,sizeof(buf),0,NULL,NULL);
if(ntohs(*((unsigned short*)(buf+12))) == 0x0806)
{
if(ntohs(*(unsigned short*)(buf+20)) == 0x02)
{
unsigned char temp_ip[] = {192,168,243,1};
if(memcmp((buf+28),temp_ip,4) == 0)
{
char dest_MAC[18] = "";
sprintf(dest_MAC,"%02x:%02x:%02x:%02x:%02x:%02x",buf[6],buf[7],buf[8],buf[9],buf[10],buf[11]);
char dest_IP[16] = "";
sprintf(dest_IP,"%d.%d.%d.%d",buf[28],buf[29],buf[30],buf[31]);
cout << dest_MAC << endl;
cout << dest_IP << endl;
break;
}
}
}
}
return NULL;
}
int main(int argc, char *argv[])
{
int sockfd = socket(PF_PACKET,SOCK_RAW,htons(ETH_P_ALL));
if(sockfd < 0)
{
perror("sockfd error");
return -1;
}
struct ifreq ethreq;
strncpy(ethreq.ifr_name,"ens33",IFNAMSIZ);
if(ioctl(sockfd,SIOCGIFINDEX,ðreq) == -1)
{
perror("ioctl error");
close(sockfd);
return -2;
}
struct sockaddr_ll sll;
bzero(&sll,sizeof(sll));
sll.sll_ifindex = ethreq.ifr_ifindex;
unsigned char destMac[6] = {0xff,0xff,0xff,0xff,0xff,0xff};
unsigned char srcMac[6] = {0x00,0x0c,0x29,0xee,0x18,0x53};
unsigned char destIp[4] = {192,168,243,1};
unsigned char srcIp[4] = {192,168,243,128};
unsigned char msg[1024] = "";
struct ether_header *macHeader = (struct ether_header*)msg;
memcpy(macHeader->ether_dhost,destMac,sizeof(destMac));
memcpy(macHeader->ether_shost,srcMac,sizeof(srcMac));
macHeader->ether_type = htons(0x0806);
struct arphdr *arpHeader = (struct arphdr*)(msg+14);
arpHeader->ar_hrd = htons(1);
arpHeader->ar_pro = htons(0x0800);
arpHeader->ar_hln = 6;
arpHeader->ar_pln = 4;
arpHeader->ar_op = htons(1);
memcpy(arpHeader->__ar_sha,srcMac,6);
memcpy(arpHeader->__ar_sip,srcIp,4);
memcpy(arpHeader->__ar_tha,destMac,6);
memcpy(arpHeader->__ar_tip,destIp,4);
pthread_t tid;
pthread_create(&tid,NULL,recvThread,(void*)&sockfd);
sendto(sockfd,msg,sizeof(msg),0,(struct sockaddr*)&sll,sizeof(sll));
pthread_join(tid,NULL);
close(sockfd);
return 0;
}
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