socket.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <sys/socket.h>
#include <net/if.h>
#include <linux/if_ether.h>
#include <linux/if_packet.h>
#include <arpa/inet.h>

static int s = -1;
static int s1 = -1;

void onexit(int signum)
{
    (void)signum;
    printf("Exiting");
    close(s);
    close(s1);
}

int main()
{
    char buf[1600];
    ssize_t recv_size = -1;
    ssize_t send_size = 42;

    int i = 0;

    struct sockaddr_ll socket_address;

    s = socket(AF_PACKET, SOCK_RAW, htons(ETH_P_ALL));

    if ((s == -1))
    {
        perror("Socket creation failed");
        exit (0);
    }

    signal(SIGINT, onexit);

    memset(&socket_address, 0, sizeof (socket_address));
    socket_address.sll_family = PF_PACKET;
    socket_address.sll_ifindex = if_nametoindex("veth0");
    socket_address.sll_protocol = htons(ETH_P_ALL);

    i = bind(s, (struct sockaddr*)&socket_address,
    sizeof(socket_address));
    if (i == -1)
    {
        perror("Bind");
        exit (0);
    }


 
        memset(&buf, 0, sizeof(buf));
        buf[0] = 1; 
	buf[1] = 1;
	buf[2] = 1;
	buf[3] = 1;
	buf[4] = 1;
	buf[5] = 1;
	buf[6] = 4;
	buf[7] = 1;
	buf[8] = 3;
	buf[9] = 2;
	buf[10] = 18;
	buf[11] = 93;
	buf[12] = 8;
	buf[13] = 6;
	buf[14] = 0;
	buf[15] = 1;
	buf[16] = 8;
	buf[17] = 0;
	buf[18] = 6;
	buf[19] = 4;
	buf[20] = 0;
	buf[21] = 1;
	buf[22] = 54;
	buf[23] = 21;
	buf[24] = -3;
	buf[25] = 42;
	buf[26] = -18;
	buf[27] = -93;
	buf[28] = -64;
	buf[29] = -88;
	buf[30] = 8;
	buf[31] = 100; 
	buf[32] = 0;
	buf[33] = 0;
	buf[34] = 0;
	buf[35] = 0;
	buf[36] = 0;
	buf[37] = 0;
	buf[38] = -40;
	buf[39] = 58;
	buf[40] = -44;
	buf[41] = 100;
        
        send_size = send(s, &buf, send_size, 0);
        printf("send size = %ld\n", send_size);
        if (send_size == -1)
        {
            perror("Socket send");
            exit (0);
        }

        recv_size = recv(s, &buf, sizeof(buf), 0);
        printf("recv size %ld\n", recv_size);
        if (recv_size == -1)
        {
            perror("Socket receive");
            exit (0);
        }

        printf("\n");
        for(i=0; i < recv_size; i++)
        {
            printf("%02x ", buf[i]);
        }
        printf("\n");

    

    return 0;
}