ME NETWORKS LAB-->UDP SOCKETS

UDP SOCKETS

#include<stdio.h>

#include<sys/types.h>

#include<sys/socket.h>

#include<netinet/in.h>

main()

{

char buf[50];

int fd,sin_size,p1,p2,i;

struct sockaddr_in client;

struct sockaddr_in server;

printf("\n Enter source and destination portno\n");

scanf("%d%d",&p1,&p2);

if((fd=socket(AF_INET,SOCK_DGRAM,0))==-1)

{

printf("Socket() error");

exit(-1);

}

bzero(&server,sizeof(server));

bzero(&client,sizeof(client));

server.sin_family=AF_INET;

client.sin_family=AF_INET;

server.sin_port=htons(p1);

client.sin_port=htons(p2);

server.sin_addr.s_addr=htonl(INADDR_ANY);

client.sin_addr.s_addr=htonl(INADDR_ANY);

if(bind(fd,(struct sockaddr*)&server,sizeof(server))==-1)

{

printf("bind error\n");

exit(-1);

}

sin_size=sizeof(client);

while(1)

{

            if(fork())

            while(1)

            {

recvfrom(fd,buf,100,0,(struct sockaddr*)&client,&sin_size);

printf("%s\n",buf);

break;

}

 

else

while(1)

{

scanf("%s",buf);

sendto(fd,buf,100,0,(struct sockaddr*)&client,sin_size);

break;

}

if(strcmp(buf,"EXIT")==0)

break;

    }

    close(fd);

    return 0;

}

 

 

 

OUTPUT:

 

Server side:

 

Enter source and destination

5000

7000

 

Hai

Hello

Good

Evening

 

 

Client side:

 

Enter source and destination

7000

5000

 

Hai

Hello

Good

Evening