/* This example code is placed in the public domain. */

#ifdef HAVE_CONFIG_H

#include <config.h>

#endif

#include <stdio.h>

#include <stdlib.h>

#include <string.h>

#include <sys/types.h>

#include <sys/socket.h>

#include <arpa/inet.h>

#include <netinet/in.h>

#include <unistd.h>

/* udp.c */

int udp_connect(void);

void udp_close(int sd);

/* Connects to the peer and returns a socket

 * descriptor.

 */

extern int udp_connect(void)

{

        const char *PORT = "5557";

        const char *SERVER = "127.0.0.1";

        int err, sd;

#if defined(IP_DONTFRAG) || defined(IP_MTU_DISCOVER)

        int optval;

#endif

        struct sockaddr_in sa;

        /* connects to server

         */

        sd = socket(AF_INET, SOCK_DGRAM, 0);

        memset(&sa, '\0', sizeof(sa));

        sa.sin_family = AF_INET;

        sa.sin_port = htons(atoi(PORT));

        inet_pton(AF_INET, SERVER, &sa.sin_addr);

#if defined(IP_DONTFRAG)

        optval = 1;

        setsockopt(sd, IPPROTO_IP, IP_DONTFRAG,

                   (const void *) &optval, sizeof(optval));

#elif defined(IP_MTU_DISCOVER)

        optval = IP_PMTUDISC_DO;

        setsockopt(sd, IPPROTO_IP, IP_MTU_DISCOVER,

                   (const void *) &optval, sizeof(optval));

#endif

        err = connect(sd, (struct sockaddr *) &sa, sizeof(sa));

        if (err < 0) {

                fprintf(stderr, "Connect error\n");

                exit(1);

        }

        return sd;

}

/* closes the given socket descriptor.

 */

extern void udp_close(int sd)

{

        close(sd);

}