Thread: Server Side program

ok went back to working on my server side TCP/IP program.

so far I am able to create, listen, and connect from a client.

just having probs with what to do next.

my goal is the following:

1server running
2client connects
3server sends "8888" to show that it is connected and waiting to receive
4client sends a number to server
5server ack with sending "8888" for good, or "9999" for bad

then repeating 4-5, until client sends 0000 for exit

the following is the start of my program:

Code:

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <windows.h>

#pragma comment(lib,"ws2_32.lib") //Winsock Library

//----- Defines ---------------------------------------------------------------
#define  PORT_NUM   8888    // Arbitrary port number for the server

int main(void)
{
  WSADATA wsaData;                      // Stuff for WSA functions
  int                  welcome_s;       // Welcome socket descriptor
  struct sockaddr_in   server_addr;     // Server Internet address
  int                  connect_s;       // Connection socket descriptor
  struct sockaddr_in   client_addr;     // Client Internet address
  struct in_addr       client_ip_addr;  // Client IP address
  int                  addr_len;        // Internet address length
  char                 out_buf[8];   // Output buffer for data
  char                 in_buf[8];    // Input buffer for data
  int                  retcode;         // Return code
 int number;

// This stuff initializes winsock
 if (WSAStartup(MAKEWORD(2,0), &wsaData) != 0)
  {
   fprintf(stderr,"Server: WSAStartup failed.\n", WSAGetLastError());
  }
 else
  {
   printf("Server: WSAStartup Success.\n");
  }
  
// >>> Step #1 <<<
// Create a welcome socket
//   - AF_INET is Address Family Internet and SOCK_STREAM is streams

  welcome_s = socket(AF_INET, SOCK_STREAM, 0);
  if (welcome_s < 0)
  {
   fprintf(stderr,"Server: Could not create socket.\n", WSAGetLastError());
  }
 else
  {
   printf("Server: Socket Created.\n");
  }
 

  // >>> Step #2 <<<
  // Fill-in server (my) address information and bind the welcome socket
  
memset((char *)&server_addr,0,sizeof(server_addr)); //Clear server address
 
  server_addr.sin_family = AF_INET;                 // Address family to use
  server_addr.sin_port = htons(PORT_NUM);           // Port number to use
  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);  // Listen on any IP address
   if (bind(welcome_s, (struct sockaddr *)&server_addr,sizeof(server_addr)) < 0)
  {
   fprintf(stderr,"Server: bind() failed with error %d\n", WSAGetLastError());
  }
 else
  {
   printf("Server: Socket bound.\n");
  }
 

  // >>> Step #3 <<<
  // Listen on welcome socket for a connection
  
listen(welcome_s, 1);
 
 // >>> Step #4 <<<
  // Accept a connection.  The accept() will block and then return with
  // connect_s assigned and client_addr filled-in.
  
printf("Waiting for accept() to complete... \n");
  addr_len = sizeof(client_addr);
  connect_s = accept(welcome_s, (struct sockaddr *)&client_addr, &addr_len);
  if (connect_s < 0)
  {
            fprintf(stderr,"Server: listen() failed with error %d\n", WSAGetLastError());
        }
 else
  {
   printf("Server: listen() is OK.\n");
  }
  
// Copy the four-byte client IP address into an IP address structure
  
memcpy(&client_ip_addr, &client_addr.sin_addr.s_addr, 4);
  
// Print an informational message that accept completed
  
printf("Accept completed (IP address of client = %s  port = %d) \n",
    inet_ntoa(client_ip_addr), ntohs(client_addr.sin_port));

where do I go with this now?

thank you

*moved to Windows Programming forum*

A clue that your topic might belong here is if you #include <windows.h> and really need it. Alternatively, you could have posted in the Networking/Device Communication forum, especially if you're open to the use of other networking libraries.