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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"
void handle_ARP (FILE *output)
{
struct nast_arp_hdr *arp;
struct libnet_ethernet_hdr *eptr;
u_short ether_type;
eptr = (struct libnet_ethernet_hdr *) packet;
arp = (struct nast_arp_hdr *) (packet+offset);
ether_type = ntohs(eptr->ether_type);
if (ether_type == ETHERTYPE_ARP)
{
n_print("princ",line_s,row_s,lg,"\n---[ ARP ]-----------------------------------------------------------\n");
n_print("princ",line_s=line_s+2,row_s,lg,"%s", nast_hex_ntoa (eptr->ether_shost));
n_print("princ",line_s,28,lg," -> ");
n_print("princ",line_s,33,lg, "%s\n", nast_hex_ntoa (eptr->ether_dhost));
switch (ntohs(arp->ar_op))
{
case 1:
{
n_print("princ",++line_s,row_s,lg,"Type: ARP request: ");
n_print("princ",line_s,20,lg,"Who has %d.%d.%d.%d? ",arp->__ar_tip[0],arp->__ar_tip[1],arp->__ar_tip[2],arp->__ar_tip[3]);
n_print("princ",line_s,46,lg,"Tell %d.%d.%d.%d\n",arp->__ar_sip[0],arp->__ar_sip[1],arp->__ar_sip[2],arp->__ar_sip[3]);
}
break;
case 2:
{
n_print("princ",++line_s,row_s,lg,"Type: ARP reply: ");
n_print("princ",line_s,20,lg,"%d.%d.%d.%d is at %s\n",arp->__ar_sip[0],arp->__ar_sip[1],arp->__ar_sip[2],arp->__ar_sip[3], nast_hex_ntoa (eptr->ether_shost));
}
break;
case 8:
n_print("princ",++line_s,row_s,lg,"Type: InARP request");
break;
case 9:
n_print("princ",++line_s,row_s,lg,"Type: InARP reply");
break;
default:
n_print("princ",++line_s,row_s,lg,"Type: Unknown Opcode");
break;
}
n_print("princ",++line_s,row_s,lg,"Hardware size: %d - ", arp->ar_hln);
n_print("princ",line_s,30,lg,"Protocol size: %d\n", arp->ar_pln);
}
else if (eptr->ether_type == ETHERTYPE_REVARP)
{
n_print("princ",line_s,row_s,lg,"\n---[ RARP ]----------------------------------------------------------\n");
n_print("princ",line_s=line_s+2,row_s,lg,"%s" , nast_hex_ntoa (eptr->ether_shost));
n_print("princ",line_s,28,lg," -> ");
n_print("princ",line_s,33,lg,"%s\n", nast_hex_ntoa (eptr->ether_dhost));
switch (ntohs(arp->ar_op))
{
case 3:
n_print("princ",++line_s,row_s,lg,"Type: RARP request");
break;
case 4:
n_print("princ",++line_s,row_s,lg,"Type: RARP reply");
break;
case 8:
n_print("princ",++line_s,row_s,lg,"Type: InARP request");
break;
case 9:
n_print("princ",++line_s,row_s,lg,"Type: InARP reply");
break;
default:
n_print("princ",++line_s,row_s,lg,"Type: Unknown Opcode");
break;
}
n_print("princ",++line_s,row_s,lg,"Hardware size: %d ",arp->ar_hln);
n_print("princ",++line_s,30,lg,"Protocol size: %d\n",arp->ar_pln);
}
n_print("princ",++line_s,0,lg,"Packet Number: %d",npkt);
if(!graph)
printf("\n");
++line_s;
row_s=0;
}
/* This function is important: control ARP response and verify that no-one is making arp-poisoning in LAN
* NB_ It's important that you run this function when U are sure that no-one is making arp-poisoning, so I can
* retrive a truly ip-mac list to confront the next ARP response with
*
* PS: ARP_RESPONSE have not broadcast destination like REQUEST
*/
/* car : control arp response */
int car (char *dev,int lg)
{
struct host *list;
u_short i,n;
char ebuf[PCAP_ERRBUF_SIZE];
struct nast_arp_hdr *arp;
int line;
line=6;
#ifdef HAVE_LIBNCURSES
if (graph)
init_scr();
#endif
if (lg)
{
openfile();
n_print (NULL,0,0,lg,"Logging to file... \n");
fflush (stdout);
n_print (NULL,0,0,lg,"NAST Control ARP Poisoning Report\n\n");
n_print (NULL,0,0,lg,"Made on %s\n\n", timed);
}
list = malloc (sizeof (struct host) * 255); /* to implement like list */
n_print ("princ",1,1,lg,"I'll build a truly MAC-IP list...\n\n");
n_print ("princ",2,1,lg,"(Press a key)\n");
getchar();
n_print ("princ",3,1,lg,"- Waiting please... \n");
fflush (stdout);
if ((list = map_lan(dev, 0, &n))==NULL)
{
if(w_error(0, "\nCan't build truly host list! mmhhh!\nReport bug to author please\n\n")==-1)
return(1);
}
if (n==0)
{
if(w_error(0, "What are you doing? You are alone in this network!\n")==-1)
return(1);
}
n_print ("princ",4,1,lg,"- Now let me sniff arp-response on the network...\n\n");
/* open pcap sniffer */
if ((pcap_lookupnet(dev, &netp, &maskp, ebuf))==-1)
{
w_error(1, "pcap_lookupnet error: %s\n", ebuf);
}
if ((descr = pcap_open_live(dev, BUFSIZ, PROMISC, 10, ebuf))==NULL)
{
w_error(1, "pcap_open_live error: %s\n", ebuf);
}
if ((pcap_compile (descr, &fp, "arp", 0, netp))==-1)
{
w_error(1, "pcap_compile error\n");
}
if ((pcap_setfilter (descr, &fp))==-1)
{
w_error(1, "pcap_setfilter error\n");
}
/* demonize */
if (demonize)
bkg();
/* now sniff */
while (1)
{
if ((packet = (u_char *) pcap_next (descr, &hdr))==NULL) continue;
if (handle_ethernet(packet)!=ETHERTYPE_ARP) continue; /* this is a paranoic test */
arp = (struct nast_arp_hdr *) (packet+offset);
if (ntohs (arp->ar_op)==2)
{
for (i=0; i<n; i++)
{
/* ricerco nel db l'ip di interesse (i) */
if (!memcmp(arp->__ar_sip, list[i].ip, 4))
{
n_print ("princ",line,1,lg,"Verifing: %d.%d.%d.%d ", arp->__ar_sip[0], arp->__ar_sip[1], arp->__ar_sip[2], arp->__ar_sip[3]);
n_print ("princ",line,27,lg,"Is %s ?\t", nast_hex_ntoa(arp->__ar_sha));
if (memcmp(arp->__ar_sha, list[i].mac, ETHER_ADDR_LEN))
n_print ("princ",line,40,lg,"Warning! Truly is %s, possible ARP-Poisoning!!!\n", nast_hex_ntoa (list[i].mac));
else
n_print ("princ",line,40,lg,"Correct\n");
++line;
break;
}
}
}
}
if (lg) n_print (NULL,0,0,lg,"\ndone\n");
return 0;
}
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