I need to link without IP only mac address over linux system. I found this code in the web
Example 1.4. Create a RAW ethernet socket
#include <sys/socket.h>
#include <linux/if_packet.h>
#include <linux/if_ether.h>
#include <linux/if_arp.h>
...
int s; /*socketdescriptor*/
s = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (s == -1) { errorhandling ... }
Example 1.5. Send a RAW ethernet frame
#define ETH_FRAME_LEN 1518
...
/*target address*/
struct sockaddr_ll socket_address;
/*buffer for ethernet frame*/
void* buffer = (void*)malloc(ETH_FRAME_LEN);
/*pointer to ethenet header*/
unsigned char* etherhead = buffer;
/*userdata in ethernet frame*/
unsigned char* data = buffer + 14;
/*another pointer to ethernet header*/
struct ethhdr *eh = (struct ethhdr *)etherhead;
int send_result = 0;
/*our MAC address*/
unsigned char src_mac[6] = {0x00, 0x01, 0x02, 0xFA, 0x70, 0xAA};
/*other host MAC address*/
unsigned char dest_mac[6] = {0x00, 0x04, 0x75, 0xC8, 0x28, 0xE5};
/*prepare sockaddr_ll*/
/*RAW communication*/
socket_address.sll_family = PF_PACKET;
/*we don't use a protocoll above ethernet layer
->just use anything here*/
socket_address.sll_protocol = htons(ETH_P_IP);
/*index of the network device
see full code later how to retrieve it*/
socket_address.sll_ifindex = 2;
/*ARP hardware identifier is ethernet*/
socket_address.sll_hatype = ARPHRD_ETHER;
/*target is another host*/
socket_address.sll_pkttype = PACKET_OTHERHOST;
/*address length*/
socket_address.sll_halen = ETH_ALEN;
/*MAC - begin*/
socket_address.sll_addr[0] = 0x00;
socket_address.sll_addr[1] = 0x04;
socket_address.sll_addr[2] = 0x75;
socket_address.sll_addr[3] = 0xC8;
socket_address.sll_addr[4] = 0x28;
socket_address.sll_addr[5] = 0xE5;
/*MAC - end*/
socket_address.sll_addr[6] = 0x00;/*not used*/
socket_address.sll_addr[7] = 0x00;/*not used*/
/*set the frame header*/
memcpy((void*)buffer, (void*)dest_mac, ETH_ALEN);
memcpy((void*)(buffer+ETH_ALEN), (void*)src_mac, ETH_ALEN);
eh->h_proto = 0x00;
/*fill the frame with some data*/
for (j = 0; j < 1500; j++) {
data[j] = (unsigned char)((int) (255.0*rand()/(RAND_MAX+1.0)));
}
/*send the packet*/
send_result = sendto(s, buffer, ETH_FRAME_LEN, 0,
(struct sockaddr*)&socket_address, sizeof(socket_address));
if (send_result == -1) { errorhandling... }
Example 1.6. Receive a RAW ethernet frame
void* buffer = (void*)malloc(ETH_FRAME_LEN); /*Buffer for ethernet frame*/
int length = 0; /*length of the received frame*/
...
length = recvfrom(s, buffer, ETH_FRAME_LEN, 0, NULL, NULL);
if (length == -1) { errorhandling .... }
is posible do than in FPC
thanks!!!
