#undef _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <string.h>

#define SECRET_PASSWORD "super_secret_password"
#define SECRET_PASSWORD_LEN strlen(SECRET_PASSWORD)

int read_string(char *prompt, char *buf, int n)
{
    puts(prompt);
    n = read(0, buf, n);
    if (n <= 0)
        exit(0xc35a);
    buf[n - 1] = '\0';
    return n;
}

void remote_shell(void) {
    char username[32];
    char password[32];
    int n;

    read_string("login: ", username, sizeof(username));
    read_string("password: ", password, 128);
    if (strncmp(password, SECRET_PASSWORD, SECRET_PASSWORD_LEN) != 0)
        exit(0xc35f);
    printf("Welcome %s!\n", username);
    puts("TO BE IMPLEMENTED\n");

    return;
}

char banner[1024];
int main(void) {
    int fd;
    int n;
    setbuf(stdout, NULL);

    fd = open("./banner.txt", O_RDONLY);
    if (fd == -1)
        exit(-1);

    n = read(fd, banner, sizeof(banner) - 1);
    if (n <= 0)
        exit(0xc35e);
    banner[n] = '\0';
    puts(banner);
    close(fd);

    remote_shell();

    return 0;
}