Advanced Socket Sytem Calls in computer networks

Computer Network Lab Manual / Advanced Socket Sytem Calls in computer networks

Program Name

Write a C Program for Advanced Socket Sytem Calls in computer networks.

Theory

cc s.c
./a.out

Program Code


#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>

int main()
{
int s;
structsockaddr_in peer, cli;
intpeer_len,cli_len;

peer.sin_family=AF_INET;
peer.sin_addr.s_addr= inet_addr("10.2.11.14");
peer.sin_port=htons(7); 

s=socket(AF_INET, SOCK_STREAM,0);
/* We must put the length in a variable.              */
connect(s, (structsockaddr*)&peer, sizeof(peer));
send(s, "Hello", 7,0);
peer_len = sizeof(peer);
/* Askgetpeername to fill in peer's socket address.  */
if (getpeername(s, (structsockaddr*)&peer, &peer_len) == -1) 
{
perror("getpeername() failed");
return -1;
}

cli_len= sizeof(cli);
if (getsockname(s, (structsockaddr*)&cli, &cli_len) == -1) 
{
perror("getsockname() failed");
return -1;
}
/* Print it. The IP address is often zero because     */
/* sockets are seldom bound to a specific local       */
/* interface.                                         */
printf("Peer's IP address is: %s\n", inet_ntoa(peer.sin_addr));
printf("Peer's port is: %d\n",   ntohs(peer.sin_port));

printf("Client's IP address is: %s\n", inet_ntoa(cli.sin_addr));
printf("Client's port is: %d\n", ntohs(cli.sin_port));

charmsg[40];
recv(s,msg,7,0);
close(s);
return 0;
}
}

Input and Output:

Output:
Peer's IP address is: 10.2.0.7                                                                 
Peer's port is: 7                                                                                   
Client's IP address is: 10.2.0.7                                                                     
Client's port is: 58929

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