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Connecting 2 different computers while using socket programming in C

Greenhorn

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posted 7 years ago

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I have created a simple server client code using sockets in C
They run perfectly fine on same device in different terminals.
How can I make them run using two different computers?
Pl explain in detail as I m a newbie to networking.
Thanks!

Ps: I am using ubuntu on both of my computers.

Maneesh Godbole

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posted 7 years ago

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Welcome to the Ranch

I have created a simple server client code using sockets in C

Can you show us your code where you connect to your localhost? Connecting to a remote machine should be a matter of just changing the IP address (and port if required)

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Shivam Saboo

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posted 7 years ago

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This is the code for my server

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

int main()
{
	/*FILE * fp;char ch[5000];
	fp=fopen("lesson1.txt","r");
	fgets(ch,5000,fp);*/

char ch[1024];

int server_socket;
	server_socket=socket(AF_INET, SOCK_STREAM, 0);
	//socket for server created

struct sockaddr_in server_address;
	server_address.sin_family=AF_INET;
	server_address.sin_port=htons(9002);
	server_address.sin_addr.s_addr=INADDR_ANY;
	
	bind(server_socket, (struct sockaddr*)&server_address, sizeof(server_address));
	//binding the server socket to the ports

listen(server_socket,5);
	//listen for client sockets

int client_socket;
	client_socket=accept(server_socket,NULL, NULL);
	//accepting a connection from client socket
	
	while(1){
		printf("Message: ");
		gets(ch);
		send(client_socket,ch,strlen(ch),0);
		recv(client_socket,&ch,sizeof(ch),0);
		printf("Message Received: %s",ch);
		}

//sending data to the connected client socket

close(server_socket);
	return 0;
}

And this is code of the client

Maneesh Godbole

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posted 7 years ago

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Did you try this out?

I wrote:Connecting to a remote machine should be a matter of just changing the IP address (and port if required)

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Shivam Saboo

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posted 7 years ago

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@ Maneesh Godbole, actually I'm completely new to networking,
Can you tell me what modifications must I make in the code to change ip address and port?
Also after doing necessary changes if both of my PCs are connected to same hotspot will it work or do I have to make some additional changes?
Thanks a lot!

Henry Wong

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posted 7 years ago

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Shivam Saboo wrote:
Can you tell me what modifications must I make in the code to change ip address and port?

With the connect() function call on the client, you need to specify the actual address and port of the peer being connected to. With an address of ANY, the only location checked for the peer, would be on the same machine.

Shivam Saboo wrote:
Also after doing necessary changes if both of my PCs are connected to same hotspot will it work or do I have to make some additional changes?

Whether it works or not depends on the network setup. And as long as you have the correct address, any additional changes is likely to be network changes, and not changes to your program.

Henry

Books: Java Threads, 3rd Edition, Jini in a Nutshell, and Java Gems (contributor)

Neha Pagare

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posted 2 months ago

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On client side I have to give client PC 's IP and port no or server's PC IP and port no

Campbell Ritchie

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posted 2 months ago

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NP: welcome to the Ranch

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