0X0SCAN_PORT V1

#include "stdio.h"
#include "unistd.h"
#include "stdlib.h"
#include "netdb.h"
#include "sys/types.h"
#include "sys/socket.h"
#include "netinet/in.h"

#define MAX_PORT 65535


char syntax()
{
        printf("\n=>Scan port by 0x0syscall\n");
	printf("-------------------------\n");
	printf("=>Syntax : <file> <host> <port_start_scan> <port_end_scan>\n\n");
	return 0;
}

char port()
{
	printf("\nERREUR\n");
	printf("------\n");
	printf("Le port doit être inferieur à 65535\n");
	printf("et le port de debut doit être inférieur au port de fin.\n\n");
	return 0;
}

int main(int argc, char **argv[])
{
	if (argc < 4)
		{
		syntax();
	  	return 0;
		}
	
	int start;
	int end;
	start = atoi(argv[2]);
	end   = atoi(argv[3]);
		
	if(end > MAX_PORT)
		{
		port();
		return 0;
		}

	if(start > end)
		{
		port();
		return 0;
		}
			
			int prt;
			int mysocket;
			int mysocket2;
			int srv_connect;
			int sockaddr_long;
	
			struct sockaddr_in sockaddr_mysocket;
        		sockaddr_long = sizeof(sockaddr_mysocket);

				sockaddr_mysocket.sin_family = PF_INET;
				sockaddr_mysocket.sin_addr.s_addr = inet_addr(argv[1]);
				
				FILE *fp;
				fp=fopen(argv[1], "a");

                                printf("\nPORT    STATUS \n");
                                printf("-----------------\n");
				
                                               
				for(prt=start;prt<=end;prt++)
					{
						sockaddr_mysocket.sin_port = htons(prt);

						mysocket2 = socket(PF_INET, SOCK_STREAM, 0);
						if(mysocket2 == -1)
						perror("");
				
						srv_connect = connect(mysocket2, (struct sockaddr*)&sockaddr_mysocket, sockaddr_long);
						
						if (srv_connect != -1)
							{
							printf("%d	Ouvert	\n", prt);
			    	   		    	fprintf(fp, "Port %d ouvert\n", prt);
						   	}
						close(fp);
						close(mysocket2);
					}
		
	printf("\n"); // pour faire plus propre ;)
	close(mysocket);
	return 0;

}