server.c

// OpsecInfosec Server
// Copyright (C) 2022  Dale Furneaux (opinfosec)
// Released under GNU GPL v2

#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#define PORT 1337

// Buffer Copy Code
int buff_copy(char *str) {
	char copy[1024];

    strcpy(copy, str);
}

int main(void)
{
    int server_fd, new_socket, valread;
    struct sockaddr_in address;
    int opt = 1;
    int addrlen = sizeof(address);
    char buffer[4096] = { 0 };

	printf("Copyright 2022 - opsec-infosec Cheep Sofwarz Cumpany\n");
    // Creating socket file descriptor
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }

    // Forcefully attaching socket to the port 1337
    if (setsockopt(server_fd, SOL_SOCKET, SO_REUSEADDR | SO_REUSEPORT, &opt, sizeof(opt))) {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

    // Forcefully attaching socket to the port 1337
    if (bind(server_fd, (struct sockaddr*)&address, sizeof(address)) < 0) {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
	// Start Listening on the socket
    if (listen(server_fd, 3) < 0) {
        perror("listen");
        exit(EXIT_FAILURE);
    }
	// Setup socket accept to receive data
    if ((new_socket = accept(server_fd, (struct sockaddr*)&address, (socklen_t*)&addrlen)) < 0) {
        perror("accept");
        exit(EXIT_FAILURE);
    }
	// Our While Loop that reads 4096 Bytes, copies into our buffer and sends it back to the client
    while (valread = read(new_socket, buffer, 4096)) {
		buff_copy(buffer);
    	printf("buffer: %s bytes: %d\n", buffer, valread);
    	send(new_socket, buffer, strlen(buffer), 0);
	}
    // closing the connected socket
    close(new_socket);
    // closing the listening socket
    shutdown(server_fd, SHUT_RDWR);
    return 0;
}