// Scan 1.0 (C)
// Coded by Anonymous
// A simple port scanner in C

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <unistd.h>

int main()
{
        char host[42];
        int start_port, end_port, i;

        printf("[ Scan 1.0 by Anonymous ]\n");
        printf("\n");

        printf("[+] Host: ");
        scanf("%s", &host);

        printf("[+] Start port: ");
        scanf("%d", &start_port);

        printf("[+] End port: ");
        scanf("%d", &end_port);
        printf("\n");

        // The scanning engine
        for (i = start_port; i <= end_port; i++)
        {
                struct sockaddr_in addr;
                struct hostent *ip;

                int sockfd = socket(PF_INET, SOCK_STREAM, 0);
                ip = gethostbyname(host);

                addr.sin_family = AF_INET;
                addr.sin_port = htons(i);
                addr.sin_addr.s_addr = inet_addr(ip);

                if ((connect(sockfd, &addr, sizeof(addr))) >= 0)
                {
                        printf("[*] Port %d is open.\n", i);

                        close(sockfd);
                }
        }

        return 0;
}