#include <stdlib.h>
    #include <string.h>
#include <stdio.h>
#include <errno.h>  
#include <unistd.h>
#include <sys/socket.h>
#include <sys/types.h>  
#include <netinet/in.h>
#include <netinet/if_ether.h>
  #include <netdb.h>
 
int _get_MAC(char *addr,char *dport) {
  int sock,sockfd, n;
  char buffer[2048];
    unsigned char *iphead, *ethhead;
    struct hostent *he;
           struct sockaddr_in their_addr; // connector's address information 
// struct ifreq iface;
 // struct sockaddr_in *addr;
  struct ether_addr ether;
  

  if ( (sock=socket(PF_PACKET, SOCK_RAW,htons(ETH_P_IP)))<0) {//
    perror("socket");
    exit(1);
  }
    
      
    if ((he=gethostbyname(addr)) == NULL) {  // get the host info 
            perror("gethostbyname");
            exit(1);
    }
      if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
            perror("socket");
            exit(1);
        }

        their_addr.sin_family = AF_INET;    // host byte order 
        their_addr.sin_port = htons(atoi(dport));  // short, network byte order 
        their_addr.sin_addr = *((struct in_addr *)he->h_addr);
        memset(&(their_addr.sin_zero), '\0', 8);  // zero the rest of the struct 

        if (connect(sockfd, (struct sockaddr *)&their_addr,
                                              sizeof(struct sockaddr)) == -1) {
            perror("connect");
            exit(1);
}  
while (1) {
if (n = recvfrom(sock,buffer,2048,0,NULL,NULL)== -1) {
    perror("recvfrom");
     close(sock);
            exit(1);
} 
 
// n = recv(sock,buffer,2048,0);
    ethhead = buffer;
    if (ethhead != NULL)
              {
     
    printf("Source MAC address: "
           "%02x:%02x:%02x:%02x:%02x:%02x\n",
           ethhead[0],ethhead[1],ethhead[2],
           ethhead[3],ethhead[4],ethhead[5]);
    printf("Destination MAC address: "
           "%02x:%02x:%02x:%02x:%02x:%02x\n",
           ethhead[6],ethhead[7],ethhead[8],
           ethhead[9],ethhead[10],ethhead[11]);  
              }
       iphead = buffer+14; /* Skip Ethernet header */
    if (*iphead==0x45) { /* Double check for IPv4 
                          * and no options present */
      printf("Source host %d.%d.%d.%d\n",
             iphead[12],iphead[13],
             iphead[14],iphead[15]);
      printf("Dest host %d.%d.%d.%d\n",
             iphead[16],iphead[17],
             iphead[18],iphead[19]);
      printf("Source,Dest ports %d,%d\n",
             (iphead[20]<<8)+iphead[21],
             (iphead[22]<<8)+iphead[23]);
      printf("Layer-4 protocol %d\n",iphead[9]);
    }
 }    
 return 0;
}


int main(int argc, char **argv) 
{
    // cc=argv[1];
    _get_MAC(argv[1],argv[2]);
      return 0;
}

#include <iostream>
#include <stdio.h>
#include <netdb.h>
#include <netinet/if_ether.h>

int _get_MAC(void) {
	int sock,sockfd, n, cnt;
	char buffer[2048];
	unsigned char *iphead, *ethhead;
	struct ether_addr ether;
  
	if ( (sock=socket(PF_PACKET, SOCK_RAW,htons(ETH_P_IP)))<0){
		perror("socket");
		exit(1);
	}

	while (1) {
		if (n = recvfrom(sock,buffer,2048,0,NULL,NULL)== -1) {
			perror("recvfrom");
			close(sock);
			exit(1);
		} 
	
		ethhead = (unsigned char *)buffer;
		
		if (ethhead != NULL){
			iphead = (unsigned char *)(buffer+14); // Skip Ethernet header
			printf("\n--------------------------------------"
				"\nMAC destino (server): "
				"%02x:%02x:%02x:%02x:%02x:%02x\n",
				ethhead[0],ethhead[1],ethhead[2],
				ethhead[3],ethhead[4],ethhead[5]);
			printf("MAC origen  (CAL30x): "
				"%02x:%02x:%02x:%02x:%02x:%02x\n",
				ethhead[6],ethhead[7],ethhead[8],
				ethhead[9],ethhead[10],ethhead[11]);  

			if (*iphead==0x45) { // Double check for IPv4 and no options present
				printf("IP destino  (server): %d.%d.%d.%d\n",
					iphead[12],iphead[13],
					iphead[14],iphead[15]);
				printf("IP origen   (CAL30x): %d.%d.%d.%d\n",
					iphead[16],iphead[17],
					iphead[18],iphead[19]);
				printf("Protocolo   (UDP=11): %02x Hex\n",iphead[9]);
			}
		}    
	}
	return 0;
}


int main(int argc, char **argv) 
{
    _get_MAC();
      return 0;
}