IPC Socket - Simple Client Exaple

/**************************************************************

 * File   :  simple-client.cpp                                                
 * Desc   :
 * simple client socket reader.  It opens a socket, connects

 * to a server, reads the message, and closes.

 ***************************************************************/

#include <iostream>

#include <stdio.h>

#include <string.h>

#include <errno.h>

#include <sys/socket.h>

#include <resolv.h>

#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>

#define PORT_TIME       13  // "time" (not available on RedHat)

#define PORT_FTP        21  // FTP connection port

#define SERVER_ADDR     "127.0.0.1"     // localhost

#define MAXBUF          1024

using namespace std;

int main()

{   int sockfd;

    struct sockaddr_in dest;

    char buffer[MAXBUF];

   /*

    * Open socket for streaming

    */

    if ( (sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0 )

    {

        perror("Socket");

        exit(errno);

    }

   /*

    *Initialize server address/port struct

    */

    bzero(&dest, sizeof(dest));

    dest.sin_family = AF_INET;

    dest.sin_port = htons(PORT_FTP);

    if ( inet_aton(SERVER_ADDR, &dest.sin_addr) == 0 )

    {

        perror(SERVER_ADDR);

        exit(errno);

    }

   /*

    *Connect to server

    */

    if ( connect(sockfd, (struct sockaddr*)&dest, sizeof(dest)) != 0 )

    {

        perror("Connect ");

        exit(errno);

    }

   /*

    * Get "message from socket"

    */

    bzero(buffer, MAXBUF);

    recv(sockfd, buffer, sizeof(buffer), 0);

    printf("%s", buffer);

   /*

    *Clean up

    */

    close(sockfd);
    return 0;

}

//
//Output
//

/**************************************************************

[sgupta@rhel55x86 chap1]$ ./simple-client
220 (vsFTPd 2.0.5)
[sgupta@rhel55x86 chap1]$
***************************************************************/