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/*
nast
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "include/nast.h"
/* if ip_dst is 0 scan for all network NIC */
int psearch (char *dev, u_long ip_dst, u_short lg)
{
u_char enet_dst[6] =
{
0xff, 0xff, 0, 0, 0, 0
};
u_char enet_src[6];
u_long ip_src;
char errbuf[256];
int sd,ln;
fd_set rfsd;
struct timeval tv;
libnet_t *l;
struct libnet_ether_addr *e;
struct nast_arp_hdr *arp;
u_char *pkt;
struct host *uphost=NULL;
u_short pcount, i, k;
u_char ip[16];
k = i = 0;
ln = 3;
if (lg)
{
openfile();
n_print (NULL,0,0,lg,"Logging to file... \n");
fflush (stdout);
n_print (NULL,0,0,lg,"NAST SNIFFER SCAN REPORT\n");
n_print (NULL,0,0,lg,"Made on %s\n\n", timed);
}
#ifdef HAVE_LIBNCURSES
if (graph)
init_scr();
#endif
/* demonize */
if (demonize)
{
w_error(0,"Is very useless demonize me in checking sniffers! Omit");
demonize=0;
}
n_print("pop",7,2,lg,"This check can have false response, pay attention!\n");
if ((l = libnet_init (LIBNET_LINK, dev, errbuf))==NULL)
{
w_error(1, "libnet_init: %s\n\n", errbuf);
}
if ((e = libnet_get_hwaddr(l))==NULL)
{
w_error(1, "Can't get hardware address: %s\n\n", libnet_geterror(l));
}
memcpy (enet_src, e->ether_addr_octet, 6);
if ((pcap_lookupnet(dev, &netp, &maskp, errbuf))==-1)
{
w_error(1, "pcap_lookupnet error: %s\n", errbuf);
}
if ((ip_src = libnet_get_ipaddr4(l))==-1)
{
w_error(1, "Can't get local ip address : %s\n\n", libnet_geterror(l));
}
/* log all packets */
if (ip_dst==0)
{
n_print ("princ",1,1,lg,"Probe for hosts...");
fflush (logd);
if ((uphost = map_lan(dev, 0, &k))==NULL)
{
if(w_error(0, "\nCan't build truly host list! mmhhh!\nReport bug to author please\n\n")==-1)
return(0);
}
if (k==0)
{
if(w_error(0, "\nWhat are you doing? You are alone in this network!\n\n")==-1)
return(0);
}
n_print ("princ",1,20,lg,"done\n\n");
}
/* only 1 host */
if (ip_dst!=0)
{
k=1;
n_print("princ",1,1,lg,"Scanning for sniffer the following host:\n");
}
while (i < k)
{
/* single host */
if (ip_dst!=0)
{
if (libnet_build_arp(ARPHRD_ETHER, ETHERTYPE_IP, 6, 4, ARPOP_REQUEST,
enet_src, (u_char *)&ip_src, enet_dst, (u_char *)&ip_dst,
NULL, 0, l, 0)==-1)
{
w_error(1, "Can't build arp header : %s\n\n", libnet_geterror(l));
}
}
/* all network */
else
{
if (libnet_build_arp(ARPHRD_ETHER, ETHERTYPE_IP, 6, 4, ARPOP_REQUEST,
enet_src, (u_char *)&ip_src, enet_dst, uphost[i].ip,
NULL, 0, l, 0)==-1)
{
w_error(1, "Can't build arp header : %s\n\n", libnet_geterror(l));
}
}
if (libnet_build_ethernet(enet_dst, enet_src, ETHERTYPE_ARP, NULL, 0, l, 0)==-1)
{
w_error(1, "Can't build arp header : %s\n\n", libnet_geterror(l));
}
/* inizializzo e recupero il file descriptor per la select */
if ((descr = pcap_open_live(dev, BUFSIZ, NOT_PROMISC, 10, errbuf))==NULL)
{
libnet_destroy(l);
w_error(1, "pcap_open_liver() error : %s\n\n", errbuf);
}
if ((pcap_compile(descr,&fp,"arp",0,netp))==-1)
{
libnet_destroy(l);
w_error(1, "error: %s\n", pcap_geterr (descr));
}
if ((pcap_setfilter(descr,&fp))==-1)
{
libnet_destroy(l);
w_error(1, "error: %s\n", pcap_geterr (descr));
}
sd = pcap_fileno(descr);
if (ip_dst!=0) n_print ("princ",ln,1,lg,"%s (%s) --------->", libnet_addr2name4(ip_dst, LIBNET_DONT_RESOLVE), libnet_addr2name4(ip_dst, LIBNET_RESOLVE));
else
{
sprintf (ip, "%d.%d.%d.%d", uphost[i].ip[0], uphost[i].ip[1], uphost[i].ip[2], uphost[i].ip[3]);
n_print ("princ",ln,1,lg,"%s (%s) --------->", ip, libnet_addr2name4(inet_addr(ip), LIBNET_RESOLVE));
}
fflush (logd);
/* mando il pacchetto */
if (libnet_write(l)==-1)
{
w_error(1, "Error sending arp request : %s\n\n", libnet_geterror(l));
}
if ((offset=(device(dev,descr)))==-1) return -1;
pcount=1;
for (;;)
{
/* inizializzo la select() */
FD_ZERO (&rfsd);
FD_SET (sd ,&rfsd);
tv.tv_sec = 3;
tv.tv_usec = 0;
if (!select(sd+1, &rfsd, NULL, NULL, &tv) || (pcount==10))
{
n_print ("princ",ln,45,lg," Not found\n");
break;
}
if ((pkt = (u_char *) pcap_next(descr, &hdr))!=NULL)
{
arp = (struct nast_arp_hdr *) (pkt+offset);
if (ntohs(arp->ar_op)==2)
{
n_print ("princ",ln,45,lg," Found!\n");
break;
}
}
pcount++;
}
/* next host */
if (descr) pcap_close(descr);
i++;
++ln;
}
if (l) libnet_destroy(l);
if (lg)
{
n_print (NULL,0,0,lg,"\nFinished\n\n");
fclose (logd);
}
else
{
n_print("winfo",1,1,lg," ");
n_print ("winfo",1,1,lg,"\nFinished\n\n");
}
return 0;
}
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