/* sshscan.c - scans port 22 for server type and version  */
/*                                                        */
/* compile: host:~$ gcc sshscan.c -o sshscan              */ 
/* usage: host:~$ ./sshscan infile > outfile              */
/*							  */
/* based on wscan.c					  */
/* CHANGES:						  */
/* -aesthetics 						  */
/* -modified serv function				  */
/*							  */
/* 2.18.01 spaceork@dhp.com                               */        


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

#define ERROR -1

int sock;
char buffer[1024];
void usage(char *s);
void scan(char *i);

int serv(char *host);
unsigned long int res(char *p);

void usage(char *s)
{
	printf("Usage: %s <inputfile>\n", s);
	exit(ERROR);
}

int main(int argc, char **argv)
{ 
	printf("sshscan - a ssh server information grabber, by spaceork@dhp.com\n");

 	if (argc != 2) 
		usage(argv[0]);
	
	printf("\n-Getting version information-\n\n");
	scan(argv[1]);
}

void scan(char *i)
{
	FILE *iff;
	char buf[512];
  
  	if((iff = fopen(i, "r")) == NULL)
    		return;
  	
	while(fgets(buf, 512, iff) != NULL) 
 	{ 
  		buf[strlen(buf) - 1] = 0; 
  		serv(buf);
        }
 
	fclose(iff);
}

int serv(char *host)
{
	struct sockaddr_in target;

	target.sin_addr.s_addr = res(host);
	target.sin_family = AF_INET;
	target.sin_port = htons(22);

	sock=socket(AF_INET, SOCK_STREAM, 0);
	if (sock < 0) 
	{ 
		printf("error in creating socket\n");
 		exit(-1);  
	}

	if (!connect(sock, (struct sockaddr *) &target, sizeof(target))) 
	{
 		recv(sock, buffer, sizeof(buffer), 0);
 		printf("Host %s\n", host);
 		printf("Version:\n%s\n", buffer);
	} 

	else
  		printf("could not connect to %s port 22\n\n", host);
   
  	close(sock);
}   

/* generic DNS resolving function */
unsigned long int res(char *p)
{
	struct hostent *h;
	unsigned long int rv;
    
	h=gethostbyname(p);
   	if(h!=NULL)
     	memcpy(&rv, h->h_addr, h->h_length);
 
	else
     		rv=inet_addr(p);
	
	return rv;
}