Computer networks Connection less client

Computer Network Lab Manual / Computer networks Connection less client

Program Name

Write a C Program for Computer networks Connection less client.

Theory

1. Connection-Less service transfers packets between are send by source and received
by the destination nodes. In Connection-Less service the packets are not routed using any path.
It can transfer the data packets between senders to the receiver without creating any connection.

2. Standard Port Numbers: 7-ECHO, 13-DAYTIME, 19-CHARACTER GENERATION

3. 10.2.0.7= It is current server IP

Program Code

//Connection-less client for standard ports (7-ECHO)

#include<stdio.h>
#include<netinet/in.h>
#include<sys/socket.h>
int main()
{
struct sockaddr_in serv;
char msg1[50], msg2[50];
int servlen;

int sockfd=socket(AF_INET, SOCK_DGRAM,0);

serv.sin_family=AF_INET;
serv.sin_addr.s_addr=inet_addr("10.2.0.7");
serv.sin_port=htons(7);

printf("Enter a String");
scanf("%s",msg1);
servlen=sizeof(serv);
sendto(sockfd,msg1,sizeof(msg1),0,(struct sockaddr*)&serv,sizeof(serv));
recvfrom(sockfd, msg2,sizeof(msg2),0,(struct sockaddr*)&serv,&servlen);

printf("Msg received from server: %s ",msg2);
close(sockfd);
return 0;
}

Input and Output:

Standard port numbers: 7-ECHO
Input: Enter a String: Hai
Output: Msg received from server: Hai


Standard port numbers: 13-DAYTIME
Input: Enter a String: Hai
Output: Msg received from server is: 23 NOV 2021 13:55:20 IST


Standard port Numbers: 19-CHARACTER GENERATION
Input: Enter a String: Hai
Output: Msg received from server is: !"#$%&'()*+,-./0123456789:;<=>?@ABCDEFGHIJKLMNOPQRhai 
10.2.0.7= It is current server IP.

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