server.cpp

#include <iostream>
#include <cstring>

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

char buffer[1024];
const char *hello = "Hello from server";

#define PORT 8080
int main(int argc, char const *argv[])
{
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int addrlen = sizeof(address);
       
    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) == 0)
    {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    // Set address
    address.sin_family = AF_INET;
    if(inet_pton(AF_INET, "127.0.0.1", &address.sin_addr) <= 0)
    {
        perror("Failed to convert address");
        exit(EXIT_FAILURE);
    }
    // address.sin_addr.s_addr = INADDR_ANY; // 0.0.0.0
    address.sin_port = htons( PORT );
       
    // Forcefully attaching socket to the port 8080
    if (bind(server_fd, (struct sockaddr *)&address,
                                 sizeof(address))<0)
    {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }

    if (listen(server_fd, 3) < 0)
    {
        perror("listen");
        exit(EXIT_FAILURE);
    }

    if ((new_socket = accept(server_fd, (struct sockaddr *)&address,
                       (socklen_t*)&addrlen))<0)
    {
        perror("accept");
        exit(EXIT_FAILURE);
    }
    while(true)
    {
        valread = read( new_socket , buffer, 1024);
        printf("%s\n", buffer);
        send(new_socket, hello, strlen(hello), 0);
    }
    return 0;
}