TCP ECHO CLIENT SERVER

AIM:
           To write a program for TCP echo client server.

ALGORITHM:
SERVER:

    STEP 1: Start
    STEP 2: Declare the variables for the socket
    STEP 3: Specify the family, protocol, IP address and port number
    STEP 4: Create a socket using socket() function
    STEP 5: Bind the IP address and Port number
    STEP 6: Listen and accept the client’s request for the connection
    STEP 7: Read the client’s message
    STEP 8: Display the client’s message
    STEP 9: Close the socket
    STEP 10: Stop
CLIENT:
    STEP 1: Start
    STEP 2: Declare the variables for the socket
    STEP 3:  Specify the family, protocol, IP address and port number
    STEP 4: Create a socket using socket() function
    STEP 5: Call the connect() function
    STEP 6: Read the input message
    STEP 7: Send the input message to the server
    STEP 8: Display the server’s echo
    STEP 9: Close the socket
    STEP 10: Stop

SOURCE CODE:
SERVER:

#include<stdio.h>
#include<netinet/in.h>
#include<netdb.h>
#define SERV_TCP_PORT 5035
int main(int argc,char**argv)
{
       int sockfd,newsockfd,clength;
       struct sockaddr_in serv_addr,cli_addr;
       char buffer[4096];
       sockfd=socket(AF_INET,SOCK_STREAM,0);
       serv_addr.sin_family=AF_INET;
       serv_addr.sin_addr.s_addr=INADDR_ANY;
       serv_addr.sin_port=htons(SERV_TCP_PORT);
       printf("\nStart");
       bind(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr));
       printf("\nListening...");
       printf("\n");
       listen(sockfd,5);
       clength=sizeof(cli_addr);
       newsockfd=accept(sockfd,(struct sockaddr*)&cli_addr,&clength);
       printf("\nAccepted");
       printf("\n");
       read(newsockfd,buffer,4096);
       printf("\nClient message:%s",buffer);
       write(newsockfd,buffer,4096);
       printf("\n");
       close(sockfd);
       return 0;
}
CLIENT:
#include<stdio.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netinet/in.h>
#include<netdb.h>
#define SERV_TCP_PORT 5035
int main(int argc,char*argv[])
{
       int sockfd;
       struct sockaddr_in serv_addr;
       struct hostent *server;
       char buffer[4096];
       sockfd=socket(AF_INET,SOCK_STREAM,0);
       serv_addr.sin_family=AF_INET;
       serv_addr.sin_addr.s_addr=inet_addr("127.0.0.1");
       serv_addr.sin_port=htons(SERV_TCP_PORT);
       printf("\nReady for sending...");
       connect(sockfd,(struct sockaddr*)&serv_addr,sizeof(serv_addr));
       printf("\nEnter the message to send\n");
       printf("\nClient: ");
       fgets(buffer,4096,stdin);
       write(sockfd,buffer,4096);
       printf("Serverecho:%s",buffer);
       printf("\n");
       close(sockfd);
       return 0;
}

OUTPUT:
SERVER:




CLIENT:















RESULT:
    Thus the program for TCP echo client server was executed and the output was
verified.
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