Add some files

This commit is contained in:
Sambo Chea 2017-01-10 00:56:20 +07:00
parent 48924bb708
commit c5fea1d496
2 changed files with 100 additions and 0 deletions

89
portscanner.c Normal file
View File

@ -0,0 +1,89 @@
/*
Port scanner code in c
*/
#include "stdio.h"
#include "sys/socket.h"
#include "errno.h"
#include "netdb.h"
#include "string.h"
#include "stdlib.h"
int main(int argc , char **argv)
{
struct hostent *host;
int err, i , sock ,start , end;
char hostname[100];
struct sockaddr_in sa;
//Get the hostname to scan
printf("Enter hostname or IP : ");
gets(hostname);
//Get start port number
printf("\nEnter start port number : ");
scanf("%d" , &start);
//Get end port number
printf("Enter end port number : ");
scanf("%d" , &end);
//Initialise the sockaddr_in structure
strncpy((char*)&sa , "" , sizeof sa);
sa.sin_family = AF_INET;
//direct ip address, use it
if(isdigit(hostname[0]))
{
printf("Doing inet_addr...");
sa.sin_addr.s_addr = inet_addr(hostname);
printf("Done\n");
}
//Resolve hostname to ip address
else if( (host = gethostbyname(hostname)) != 0)
{
printf("Doing gethostbyname...");
strncpy((char*)&sa.sin_addr , (char*)host->h_addr , sizeof sa.sin_addr);
printf("Done\n");
}
else
{
herror(hostname);
exit(2);
}
//Start the port scan loop
printf("Starting the portscan loop : \n");
for( i = start ; i <= end ; i++)
{
//Fill in the port number
sa.sin_port = htons(i);
//Create a socket of type internet
sock = socket(AF_INET , SOCK_STREAM , 0);
//Check whether socket created fine or not
if(sock < 0)
{
perror("\nSocket");
exit(1);
}
//Connect using that socket and sockaddr structure
err = connect(sock , (struct sockaddr*)&sa , sizeof sa);
//not connected
if( err < 0 )
{
//printf("%s %-5d %s\r" , hostname , i, strerror(errno));
fflush(stdout);
}
//connected
else
{
printf("%-5d open\n", i);
}
close(sock);
}
printf("\r");
fflush(stdout);
return(0);
}

11
test.c Normal file
View File

@ -0,0 +1,11 @@
#include "stdio.h"
void main(){
int a;
printf("Enter a: ");
scanf("%d",a);
printf(a);
}