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TCP SOCKETS CHAT APPLICATION(SERVER & CLIENT) USING C


SERVER
#include<stdio.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netdb.h>
#include<stdlib.h>
#include<string.h>
#define MAX 80
#define PORT 43454
#define SA struct sockaddr
void func(int sockfd)
{
char buff[MAX];
int n;
for(;;)
{
bzero(buff,MAX);
read(sockfd,buff,sizeof(buff));
printf("From client: %s\t To client : ",buff);
bzero(buff,MAX);
n=0;
while((buff[n++]=getchar())!='\n');
write(sockfd,buff,sizeof(buff));
if(strncmp("exit",buff,4)==0)
{
printf("Server Exit...\n");
break;
}
}
}
int main()
{
int sockfd,connfd,len;
struct sockaddr_in servaddr,cli;
sockfd=socket(AF_INET,SOCK_STREAM,0);
if(sockfd==-1)
{
printf("socket creation failed...\n");
exit(0);
}
else
printf("Socket successfully created..\n");
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_addr.s_addr=htonl(INADDR_ANY);
servaddr.sin_port=htons(PORT);
if((bind(sockfd,(SA*)&servaddr, sizeof(servaddr)))!=0)
{
printf("socket bind failed...\n");
exit(0);
}
else
printf("Socket successfully binded..\n");
if((listen(sockfd,5))!=0)
{
printf("Listen failed...\n");
exit(0);
}
else
printf("Server listening..\n");
len=sizeof(cli);
connfd=accept(sockfd,(SA *)&cli,&len);
if(connfd<0)
{
printf("server acccept failed...\n");
exit(0);
}
else
printf("server acccept the client...\n");
func(connfd);
close(sockfd);
}

CLIENT
#include<stdio.h>
#include<netinet/in.h>
#include<sys/types.h>
#include<sys/socket.h>
#include<netdb.h>
#include<string.h>
#include<stdlib.h>
#define MAX 80
#define PORT 43454
#define SA struct sockaddr
void func(int sockfd)
{
char buff[MAX];
int n;
for(;;)
{
bzero(buff,sizeof(buff));
printf("Enter the string : ");
n=0;
while((buff[n++]=getchar())!='\n');
write(sockfd,buff,sizeof(buff));
bzero(buff,sizeof(buff));
read(sockfd,buff,sizeof(buff));
printf("From Server : %s",buff);
if((strncmp(buff,"exit",4))==0)
{
printf("Client Exit...\n");
break;
}
}
}

int main()
{
int sockfd,connfd;
struct sockaddr_in servaddr,cli;
sockfd=socket(AF_INET,SOCK_STREAM,0);
if(sockfd==-1)
{
printf("socket creation failed...\n");
exit(0);
}
else
printf("Socket successfully created..\n");
bzero(&servaddr,sizeof(servaddr));
servaddr.sin_family=AF_INET;
servaddr.sin_addr.s_addr=inet_addr("127.0.0.1");
servaddr.sin_port=htons(PORT);
if(connect(sockfd,(SA *)&servaddr,sizeof(servaddr))!=0)
{
printf("connection with the server failed...\n");
exit(0);
}
else
printf("connected to the server..\n");
func(sockfd);
close(sockfd);
}


OUTPUT
SERVER SIDE
$ cc tcpchatserver.c
$ ./a.out
Socket successfully created..
Socket successfully binded..
Server listening..
server acccept the client...
From client: hai
To client : hello
From client: exit
To client : exit
Server Exit...
$

CLIENT SIDE
$ cc tcpchatclient.c
$ ./a.out
Socket successfully created..
connected to the server..
Enter the string : hai
From Server : hello
Enter the string : exit
From Server : exit
Client Exit...
$ 
Labels:

Comments

  1. Swapnil22 July 2015 at 03:19

    nice ....

    ReplyDelete
  2. Unknown4 November 2015 at 05:36

    say no more

    ReplyDelete
  3. Unknown2 March 2016 at 10:39

    what are the changes required in order to send simultanous messages

    ReplyDelete
  4. Kavin Sharma25 November 2016 at 08:22

    How to make encrypted chat between client and server

    ReplyDelete
  5. Satyapal Singh18 April 2017 at 06:37

    can anyone tell me why is this code not running in code blocks?

    ReplyDelete
    Replies
    1. Unknown18 July 2017 at 07:05

      you can try it in linux terminal (Putty) . Code blocks is just an IDE . If you have windows OS you must have virtual machine (VMWare) so that you can enable putty

      Delete
  6. MyDiary Book5 May 2017 at 09:37

    how to run this in client terminal? ./client 127.0.0.1 is this correct? can any one please tell me?

    ReplyDelete
  7. Unknown23 May 2017 at 11:57

    How do i exit the connection for both ends?

    ReplyDelete
  8. DGF9 January 2018 at 01:40

    how to send multiples messages in this code?please

    ReplyDelete
  9. Unknown2 May 2018 at 11:00

    anyone online?

    ReplyDelete
  10. Crispus22 June 2018 at 05:11

    cool stuff

    ReplyDelete
  11. Unknown30 October 2018 at 02:44

    connection with the server failed

    ReplyDelete
    Replies
    1. Andru31 October 2018 at 08:06

      because u haven't open the server yet maybe(?)

      Delete
  12. Couple Monitor18 May 2019 at 05:39

    Nice Article. I loved the way you describe everything about chat application. Looking forward to your blog.

    ReplyDelete
  13. slr10 July 2019 at 23:14

    Thanks.
    How can I add multiple clients to this chat system

    ReplyDelete
  14. extension lead23 August 2023 at 05:27

    extension-lead-10m-power-strip-1-socket-extension-cord-10-meter-1-way-single-socket-mains-electric-power-black-extension-cable-uk">10m black extension lead

    ReplyDelete
  15. extension lead3 September 2023 at 23:54

    8 gang surge protected extension lead<

    ReplyDelete
  16. extension lead25 October 2023 at 23:56

     5m extension lead with usb

    ReplyDelete

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