/*
 * Send udp packets from two various interfaces,
 *
 * This tool used to check correctly work option
 * setsockopt(SO_BINDTODEVICE)
 * Use together with b2d_recv.c
 * Detailed description in file b2d_recv.c
 *
 * usage    ./b2d_send ip1 ip2 port
 * example: ./b2d_send 192.168.44.2 192.168.45.2 23777
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <errno.h>

#define RX_BUFF_SIZE 1024

/* create sender socket, if error occured exit(EXIT_FAILURE) */
int create_sender_sock(const char * str_ip, const char * str_port,
                       struct sockaddr_in * sock_addr);

int
main(int argc, char *argv[])
{
    struct sockaddr_in sa_sender1, sa_sender2;

    if (argc != 4)
    {
        printf("usage: %s ip1 ip2 port\n", argv[0]);
        exit(EXIT_FAILURE);
    }

    int sfd_sender1 = create_sender_sock(argv[1], argv[3], &sa_sender1);
    int sfd_sender2 = create_sender_sock(argv[2], argv[3], &sa_sender2);

    char tx_buff1[] = "Data from first socket";
    char tx_buff2[] = "Data from second socket";

    ssize_t res = send(sfd_sender1, tx_buff1, strlen(tx_buff1) + 1, 0);
    if (res < 0)
    {
        perror("sender1");
        exit(EXIT_FAILURE);
    }
    printf("success send %ld bytes to %s:%s \"%s\"\n",
            res, argv[1], argv[3], tx_buff1);

    res = send(sfd_sender2, tx_buff2, strlen(tx_buff2) + 1, 0);
    if (res < 0)
    {
        perror("sender2");
        exit(EXIT_FAILURE);
    }
    printf("success send %ld bytes to %s:%s \"%s\"\n",
            res, argv[2], argv[3], tx_buff2);

    exit(EXIT_SUCCESS);

}/* main() */


int
create_sender_sock(const char * str_ip, const char * str_port,
                   struct sockaddr_in * sock_addr)
{
    int res;
    int sockfd = socket(AF_INET, SOCK_DGRAM, 0);
    if (sockfd < 0)
    {
        perror("socket");
        exit(EXIT_FAILURE);
    }

    memset(sock_addr, 0, sizeof(struct sockaddr_in));
    sock_addr->sin_family = AF_INET;
    if (inet_pton(AF_INET, str_ip, &(sock_addr->sin_addr)) != 1)
    {
        perror("Bad ip_add");
        exit(EXIT_FAILURE);
    }
    sock_addr->sin_port = htons((uint16_t)atoi(str_port));

    res = connect(sockfd, (struct sockaddr*)sock_addr,
                  sizeof(struct sockaddr_in));
    if (res < 0)
    {
        perror("connect");
        exit(EXIT_FAILURE);
    }

    return sockfd;

}/* create_sender_socket() */