TCP Client server Communication Program

                                                            Connection oriented Program

                    // TCP SERVER PROGRAM

#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include<netinet/in.h>
#include<sys/types.h>




int main()
{

char buff[2000];
int sd,connfd,len;

struct sockaddr_in servaddr,cliaddr;

sd=socket(AF_INET,SOCK_STREAM,0);

if(sd==-1)
{
    printf(" socket not created in server\n");
    exit(0);
}
else
{
    printf("socket created in  server\n");
}

bzero(&servaddr, sizeof(servaddr));

servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = INADDR_ANY;
servaddr.sin_port = htons(7802);

if ( bind(sd, (struct sockaddr *)&servaddr, sizeof(servaddr)) != 0 )
    printf("Not binded\n");
else
    printf("Binded\n");

if(listen(sd,1)!=0)
    printf("Not listened\n");
else
    printf("Listened\n");

len=sizeof(cliaddr);

connfd=accept(sd,(struct sockaddr *) &cliaddr, &len);

if(connfd!=0) 
    printf("Server accepted client \n");
else
    printf("Server not accepted client\n");


recv(connfd,buff,1024,0);

    printf("Serever received msg from client  %s",buff);

close(sd);
   
return(0);
}




                        // TCP CLIENT PROGRAM

#include <stdio.h>
#include <errno.h>
#include <sys/socket.h>
#include <resolv.h>
#include<netinet/in.h>
#include<sys/types.h>



int main()
{
char buff[2000];
int sockfd,connfd,len;

struct sockaddr_in servaddr,cliaddr;

// create socket in client side
sockfd=socket(AF_INET,SOCK_STREAM,0);

if(sockfd==-1)
{
    printf(" socket not created in client\n");
    exit(0);
}
else
{
    printf("socket created in  client\n");
}


bzero(&servaddr, sizeof(servaddr));

servaddr.sin_family = AF_INET;
servaddr.sin_addr.s_addr = INADDR_ANY; // ANY address or use specific address
servaddr.sin_port = htons(7802);  // Port address

// client connected to server using server address
if(connect(sockfd,(struct sockaddr *)&servaddr, sizeof(servaddr) )!=0)
{
    printf("client not connected to server\n");
    exit(0);
}
else
{
    printf("client connected to server\n");
}


    printf("Type ur client message\n");
    scanf("%s",buff);

// send  msg to server
    send(sockfd,buff,1024,0);

//close client side connection
close(sockfd);

return(0);
}

Steps:
       1) Compile and Run Server Program   cc tcpserver.c   ./a.out
        2) Compile and Run Client Program   cc tcpclient.c     ./a.out
        3) Enter Message in Client