#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <string.h>
#include <netdb.h>
#include <stdio.h>

#define PORTNUMBER  12345

int
main(void)
{
    int n, s, len;
    char buf[1024];
    char hostname[64];
    struct hostent *hp;
    struct sockaddr_in name;

    /*
     * Get our local host name.
     */
    if (gethostname(hostname, sizeof(hostname)) < 0) {
        perror("gethostname");
        exit(1);
    }

    /*
     * Look up our host's network address.
     */
    if ((hp = gethostbyname(hostname)) == NULL) {
        fprintf(stderr, "unknown host: %s.\n", hostname);
        exit(1);
    }

    /*
     * Create a socket in the INET
     * domain.
     */
    if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket");
        exit(1);
    }

    /*
     * Create the address of the server.
     */
    memset(&name, 0, sizeof(struct sockaddr_in));

    name.sin_family = AF_INET;
    name.sin_port = htons(PORTNUMBER);
    memcpy(&name.sin_addr, hp->h_addr_list[0], hp->h_length);
    len = sizeof(struct sockaddr_in);

    /*
     * Connect to the server.
     */
    if (connect(s, (struct sockaddr *) &name, len) < 0) {
        perror("connect");
        exit(1);
    }

    /*
     * Read from standard input, and copy the
     * data to the socket.
     */
    while ((n = read(0, buf, sizeof(buf))) > 0) {
        if (send(s, buf, n, 0) < 0) {
            perror("send");
            exit(1);
        }
    }

    close(s);
    exit(0);
}