tcp_client.c

/*-
 * Copyright (c) 2013 Michael Tuexen
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

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

#define BUFFER_SIZE  (2<<16)
#define MESSAGE_SIZE (9216)

int main(int argc, char **argv)
{
    int fd, in, port;
    fd_set rset;
    struct sockaddr_in server_addr;
    ssize_t len;
    char buf[BUFFER_SIZE];

    if (argc != 3)
    {
        printf("usage: echo_client \"IP-Adress Port\"\n");
        return 0;
    }

    port = atoi(argv[2]);

    /* Adresse ausgeben */
//  printf("Address: %s:%d\n", argv[1], port);

    in = 0;
    fd = Socket(AF_INET, SOCK_STREAM, 0);

    memset(&server_addr, 0, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
#ifdef HAVE_SIN_LEN
    server_addr.sin_len = sizeof(struct sockaddr_in);
#endif
    server_addr.sin_port = htons(port);
    if ((server_addr.sin_addr.s_addr = (in_addr_t)inet_addr(argv[1])) == INADDR_NONE) {
        fprintf(stderr, "Invalid address\n");
    }

    Connect(fd, (const struct sockaddr *) &server_addr, sizeof(server_addr));

    memset((void *) buf, 'A', sizeof(buf));

    /* FD-Set initialisieren */
    FD_ZERO(&rset);
    /* FileDescriptors zum set hinzufügen */
    FD_SET(in, &rset);
    FD_SET(fd, &rset);

    for(;;)
    {
        if (Select(fd + 1, &rset, NULL, NULL, NULL) == 0)
        {
            /* Timeout... call Select again */
            printf("Select call timed out\n");
            continue;
        }

        /* Pending user input */
        if (FD_ISSET(in, &rset))
        {
            /* Buffer "nullen" */
            memset((void *) buf, 0, sizeof(buf));

            len = Read(in, (void *) buf, sizeof(buf));
            if (len < 0)
            {
                perror("read");
            }

            /* Stdin geschlossen */
            if (len == 0)
            {
                /* Verbindungsabbau anstossen */
                Shutdown(fd, SHUT_WR);
                printf("Verbindungsabbau...\n");
            }

            /* Send user input to server */
            Write(fd, (const void *) buf, (size_t) len);

            buf[len] = '\0';
            printf("Send to server: %s\n", buf);
        }

        /* Pending data on port */
        if (FD_ISSET(fd, &rset))
        {
            /* Buffer "nullen" */
            memset((void *) buf, 0, sizeof(buf));

            /* Socket lesen */
            len = Read(fd, (void *) buf, sizeof(buf));

            if (len == 0)
            {
                /* Server closed the connection */
                printf("Server closed the connection.\n");
                break;
            }

            buf[len] = '\0';
            printf("%s", buf);
        }
    }

    /* Client soll sich beenden sobald der Server die Verbindung schließt */
    Close(fd);


    return(0);
}