Hi All,

I am trying to send data from client to server. And getting data back to client. But I am facing following issue.
1. I am unable to display client message in server side.
2. I am unable to get back message from server.

Also I am not getting any error message while compiling the code. I think the issue is with some coding missing in my client-server code. But I am unable to find it. Please help me if you find anything wrong in my code.

Here are my code's

Client Code

/*Code for Client*/

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

//char get_port_val(char din,char dclk);

//char get_port_val(char din,char dclk)

void main()
{

        int sock, bytes_recieved;
    char buf[100];  
        struct hostent *host;
        struct sockaddr_in server_addr;  

    //Default hostname assignment
        host = gethostbyname("127.0.0.1");

        printf("Creating Client Socket\n");
    //Creating socket for client
        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
            perror("Error while creating client Socket\n");
            exit(1);
        }
    printf("Client Socket created successfully\n");

        server_addr.sin_family = AF_INET;     
        server_addr.sin_port = htons(5000);   
        server_addr.sin_addr = *((struct in_addr *)host->h_addr);
        bzero(&(server_addr.sin_zero),8); 

        printf("Connecting to server \n");
    //Conneting to server
        if (connect(sock, (struct sockaddr *)&server_addr,
                    sizeof(struct sockaddr)) == -1) 
        {
            perror("Error while connecting to server");
            exit(1);
        }
    printf("Conneted to server\n");


       //Sending and receiving data to-from server

    strcpy(buf,"Hello");
        printf("Value of buf is %s \n",buf);

    printf("Sending data to server from client \n");
        send(sock,buf,strlen(buf),0);
    printf("Data send to server successfully\n");

    printf("Receiving data from server \n");
        recv(sock,buf,strlen(buf),0);
    printf("Received data from server suceessfully\n");

    close(sock);



    /*
    while(1)
        {

          bytes_recieved=recv(sock,recv_data,1024,0);
          recv_data[bytes_recieved] = '\0';

          if (strcmp(recv_data , "q") == 0 || strcmp(recv_data , "Q") == 0)
          {
           close(sock);
           break;
          }

          else
           printf("\nRecieved data = %s " , recv_data);

           printf("\nSEND (q or Q to quit) : ");
           gets(send_data);

          if (strcmp(send_data , "q") != 0 && strcmp(send_data , "Q") != 0)
           send(sock,send_data,strlen(send_data), 0); 

          else
          {
           send(sock,send_data,strlen(send_data), 0);   
           close(sock);
           break;
          }

        } */  
//return 0;
}

Server Code

/* Code for server */

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


int main()
{
        int sock, connected, bytes_recieved , true = 1;  
        char buf[1024];       

        struct sockaddr_in server_addr,client_addr;    
        int sin_size;

    //Creating socket for server
        if ((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
            perror("Error while creating server Socket\n");
            exit(1);
        }
    printf("Server socket created successfully\n");

      //  if (setsockopt(sock,SOL_SOCKET,SO_REUSEADDR,&true,sizeof(int)) == -1) {
       //     perror("Setsockopt");
        //    exit(1);
       // }

        server_addr.sin_family = AF_INET;         
        server_addr.sin_port = htons(5000);     
        server_addr.sin_addr.s_addr = INADDR_ANY; 
        bzero(&(server_addr.sin_zero),8); 

        //bind socket
        if (bind(sock, (struct sockaddr *)&server_addr, sizeof(struct sockaddr))
                                                                       == -1) {
            perror("Unable to bind inside server socket\n");
            exit(1);
        }
    printf("Bind Socket completed\n");

        //Listning  
        if (listen(sock, 5) == -1) {
            perror("Error while Listening from client\n");
            exit(1);
        }


    while(1)
    {
      sin_size = sizeof(struct sockaddr_in);
      printf("Establishing connection between client and server\n");
      if(connected = accept(sock, ( struct sockaddr *)&client_addr,&sin_size)==-1)
      {
        perror("Error in server while accepting connection from client\n");
            exit(1);    
      }
      printf("Connection established\n");
      printf("Receiving data from client\n");
      recv(connected,buf,strlen(buf),0);
      printf("Received data from client is %s \n",buf);
      printf("Sending back data to client\n");
      send(connected,buf,strlen(buf),0);
      printf("Data send to client is %s \n",buf);

    }

    close(sock);
    return 0;

    //printf("\nTCPServer Waiting for client on port 5000");
        //fflush(stdout);
/*

        while(1)
        {  

            sin_size = sizeof(struct sockaddr_in);

            connected = accept(sock, (struct sockaddr *)&client_addr,&sin_size);

            printf("\n I got a connection from (%s , %d)",
                   inet_ntoa(client_addr.sin_addr),ntohs(client_addr.sin_port));

            while (1)
            {
              printf("\n SEND (q or Q to quit) : ");
              gets(send_data);

              if (strcmp(send_data , "q") == 0 || strcmp(send_data , "Q") == 0)
              {
                send(connected, send_data,strlen(send_data), 0); 
                close(connected);
                break;
              }

              else
                 send(connected, send_data,strlen(send_data), 0);  

              bytes_recieved = recv(connected,recv_data,1024,0);

              recv_data[bytes_recieved] = '\0';

              if (strcmp(recv_data , "q") == 0 || strcmp(recv_data , "Q") == 0)
              {
                close(connected);
                break;
              }

              else 
              printf("\n RECIEVED DATA = %s " , recv_data);
              fflush(stdout);
            }
        }       

      close(sock);
      return 0;
*/
} 
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