server

// it is server side code:

#include <netinet/in.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <unistd.h>
#define PORT 2042

int server_fd, new_socket;
ssize_t valread;
struct sockaddr_in address;
int opt = 1;

socklen_t addrlen = sizeof(address);
char buffer[4096];

void req_init();

void hi_request();
void logining_request();
void resource_request();
void variable_request();

int main(){

    printf("Cardinal v1.0A \n");

    // Starting server:
    if ((server_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0){
        perror("socket failed");
            exit(EXIT_FAILURE);
        }

    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);

re:
        system("fuser -k 2042/tcp");

    sleep(5);
    if(bind(server_fd, (struct sockaddr*)&address, sizeof(address))  < 0) {
        printf("bind failed - retrying in 3s.\n");
        sleep(3);
        goto re;
    return 500;
    }

    printf("start susscessfull. \n");
    printf("listening port 2042.. \n \n");

    // Main cycle:
    do{
        listen(server_fd, 3);
        new_socket = accept(server_fd, (struct sockaddr*)&address, &addrlen);

            valread = read(new_socket, buffer, 1024 - 1);
        if(buffer != NULL){req_init();}
        bzero(buffer, 1024);
    }while(1);

    close(server_fd);
    return 0;
}

void req_init(){

    printf("\033[92m => request \033[0m\n");
    printf("      type: ");
    switch(buffer[0]){
        case 'H': printf("connection check.\n"); hi_request(); break;
        case 'L': printf("loginig.\n"); logining_request(); break;
        case 'V': printf("variable(s) request.\n"); variable_request(); break;
        case 'R': printf("resource request.\n"); resource_request(); break;
        default: printf("unknown...\n"); break;
    }


}

void hi_request(){
    char hi[] = "hi";
        //send(new_socket, hi, strlen(hi), 0);
    printf("      responsed: none. \n");
}

//   ***

void resource_request(){

    char resource_path[256];

    int i = 0;
    while(buffer[i] != '"'){
        i++;
    };
    int j = 0; i++;
    while(buffer[i] != '"'){
        resource_path[j] = buffer[i];
        i++; j++;
    }

    while(j != 255){
        resource_path[j] = 0x00;
        j++;
    }

    //printf("\n%s\n", resource_path);
    //printf("\n%s\n", buffer);                   // there's all okay

    FILE *requested = fopen(resource_path, "r");
    if(requested == NULL){
        send(new_socket, "err. 404", 228, 0);
        printf("      responsed: err no. 404.\n");
    }else{
        fseek(requested, 0, SEEK_END);
        long int fsize = ftell(requested);
        fseek(requested, 0, SEEK_SET);
        fsize = 12;

        unsigned char *send_buffer = (unsigned char*)malloc(4 * 1024 * 1024); // 4kb buffer

        fread(send_buffer, 14, 1, requested);
        buffer[fsize + 1] = 0x00;
        send(new_socket, send_buffer, 16, 0); // why only 8 bytes were sent?
        free(send_buffer);
        fclose(requested);
    }

}