C++ Socket Connection on Linux - c++

Question

I'm new to C++ and am trying to setup a connection to a remote server but having problems getting it to work. Spec: Ubuntu 16.04, pre-installed g++ compiler and when I run the following code it returns "pre-standard C++":
if( __cplusplus == 201103L ) std::cout << "C++11\n" ;
else if( __cplusplus == 19971L ) std::cout << "C++98\n" ;
else std::cout << "pre-standard C++\n" ;
My code is as follows:
#include <iostream>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdlib.h>
#include <unistd.h>
#include <netdb.h>
using namespace std;
int main() {
int client;
int portNum = 80;
bool isExit = false;
int bufsize = 1024;
char buffer[bufsize];
const char ip[] = "216.58.210.36"; //google ip for test connection
const char req[] = "GET / HTTP/1.1\nHost: www.google.com"; //test
char res[bufsize];
struct sockaddr_in server_addr;
client = socket(AF_INET, SOCK_STREAM, 0);
if (client < 0) {
cout << "\nError establishing socket..." << endl;
exit(1);
}
cout << "\n=> Socket client has been created..." << endl;
server_addr.sin_family = AF_INET;
server_addr.sin_port = htons(portNum);
inet_aton(ip, &server_addr.sin_addr);
if (connect(client,(struct sockaddr *)&server_addr, sizeof(server_addr)) == 0){
cout << "=> Connection to the server port number: " << portNum << endl;
}
send(client, req, bufsize, 0);
cout << "=> Awaiting confirmation from the server..." << endl;
recv(client, buffer, bufsize, 0);
cout << "=> Connection confirmed, response:" << buffer << endl;
cout << res << endl;
close(client);
return 0;
}
The client is created and the socket connects but the code hangs on the call to recv() and no response is received. I'm assuming that's because the request I'm sending is in the wrong format/data type/etc. Can anyone advise where I'm going wrong? Cheers!

Answer 1

You haven't sent a complete HTTP request so the server is waiting for more data.
You need to use \r\n as your line separator and your request has to end in a blank line:
const char req[] = "GET / HTTP/1.1\r\nHost: www.google.com\r\n\r\n";
Plus as others have commented you need to check for errors.
You are also sending 1024 bytes of data from a buffer which is much smaller.