UDP 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<string.h>

#include<stdlib.h>

#define MAX 80

#define PORT 43454

#define SA struct sockaddr

void func(int sockfd)

{

char buff[MAX];

int n,clen;

struct sockaddr_in cli;

clen=sizeof(cli);

for(;;)

{

bzero(buff,MAX);

recvfrom(sockfd,buff,sizeof(buff),0,(SA *)&cli,&clen);

printf("From client %s To client",buff);

bzero(buff,MAX);

n=0;

while((buff[n++]=getchar())!='\n');

sendto(sockfd,buff,sizeof(buff),0,(SA *)&cli,clen);

if(strncmp("exit",buff,4)==0)

{

printf("Server Exit...\n");

break;

}

}

}

int main()

{

int sockfd;

struct sockaddr_in servaddr;

sockfd=socket(AF_INET,SOCK_DGRAM,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");

func(sockfd);

close(sockfd);

}

CLIENT

#include<sys/socket.h>

#include<netdb.h>

#include<string.h>

#include<stdlib.h>

#include<stdio.h>

#define MAX 80

#define PORT 43454

#define SA struct sockaddr

int main()

{

char buff[MAX];

int sockfd,len,n;

struct sockaddr_in servaddr;

sockfd=socket(AF_INET,SOCK_DGRAM,0);

if(sockfd==-1)

{

printf("socket creation failed...\n");

exit(0);

}

else

printf("Socket successfully created..\n");

bzero(&servaddr,sizeof(len));

servaddr.sin_family=AF_INET;

servaddr.sin_addr.s_addr=inet_addr("127.0.0.1");

servaddr.sin_port=htons(PORT);

len=sizeof(servaddr);

for(;;)

{

printf("\nEnter string : ");

n=0;

while((buff[n++]=getchar())!='\n');

sendto(sockfd,buff,sizeof(buff),0,(SA *)&servaddr,len);

bzero(buff,sizeof(buff));

recvfrom(sockfd,buff,sizeof(buff),0,(SA *)&servaddr,&len);

printf("From Server : %s\n",buff);

if(strncmp("exit",buff,4)==0)

{

printf("Client Exit...\n");

break;

}

}

close(sockfd);

}

OUTPUT

SERVER SIDE

$ cc udpchatserver.c

$ ./a.out

Socket successfully created..

Socket successfully binded..

From client hai

To client hello

From client exit

To client exit

Server Exit...

$

CLIENT SIDE

$ cc udpchatclient.c

$ ./a.out

Socket successfully created..

Enter string : hai

From Server : hello

Enter string : exit

From Server : exit

Client Exit...

$