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/*
Perl ARP Extension
Create and send an arp packets, lookup mac addresses
Programmed by Bastian Ballmann
Last update: 31.01.2007
This program is free software; you can redistribute
it and/or modify it under the terms of the
GNU General Public License version 2 as published
by the Free Software Foundation.
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.
*/
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
#include "ppport.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <net/ethernet.h>
#include <netinet/ether.h>
#include <net/if.h>
#include <arpa/inet.h>
#include "arp.h"
MODULE = Net::ARP PACKAGE = Net::ARP
int
send_packet(dev, sip, dip, smac, dmac, type)
unsigned char *dev;
unsigned char *sip;
unsigned char *dip;
unsigned char *smac;
unsigned char *dmac;
unsigned char *type;
CODE:
int uid;
unsigned int packetsize = sizeof(struct my_arphdr) + sizeof(struct ether_header);
unsigned char packet[packetsize];
struct ether_header *ethhdr = (struct ether_header *)packet;
struct my_arphdr *arp = (struct my_arphdr *)(packet + sizeof(struct ether_header));
u_short op;
in_addr_t ipaddr;
RETVAL = 1;
// Are you root?
uid = getuid();
if(uid != 0)
{
printf("You must have UID 0 instead of %d.\n",uid);
exit(0);
}
// Initialize packet buffer
memset(packet,0,packetsize);
// What's the ARP operation type?
if(!strcmp(type,"request"))
{
op = ARPOP_REQUEST;
}
else if(!strcmp(type,"reply"))
{
op = ARPOP_REPLY;
}
else if(!strcmp(type,"revrequest"))
{
op = ARPOP_REVREQUEST;
}
else if(!strcmp(type,"revreply"))
{
op = ARPOP_REVREPLY;
}
else if(!strcmp(type,"invrequest"))
{
op = ARPOP_INVREQUEST;
}
else if(!strcmp(type,"invreply"))
{
op = ARPOP_INVREPLY;
}
else
{
op = ARPOP_REPLY;
}
if(smac == NULL)
{
printf("Parameter smac is NULL! Terminating.\n");
RETVAL = 0;
}
if(dmac == NULL)
{
printf("Parameter dmac is NULL! Terminating.\n");
RETVAL = 0;
}
// Found a dollar sign?
if(strchr(smac,36))
{
printf("Found a $ char in smac! Terminating.\n");
RETVAL = 0;
}
if(strchr(dmac,36))
{
printf("Found a $ char in dmac! Terminating.\n");
RETVAL = 0;
}
if(ether_aton(smac) == NULL)
{
printf("Invalid source mac address! Terminating.\n");
RETVAL = 0;
}
if(ether_aton(dmac) == NULL)
{
printf("Invalid destination mac address! Terminating.\n");
RETVAL = 0;
}
// Check ips
if(inet_addr(sip) == INADDR_NONE)
{
printf("Invalid source ip address! Terminating.\n");
RETVAL = 0;
}
if(inet_addr(dip) == INADDR_NONE)
{
printf("Invalid destination ip address! Terminating.\n");
RETVAL = 0;
}
// Construct and send packet
if(RETVAL != 0)
{
// Ethernet header
memcpy(ethhdr->ether_dhost,(u_char *)ether_aton(dmac),ETHER_ADDR_LEN); // Destination MAC
memcpy(ethhdr->ether_shost,(u_char *)ether_aton(smac),ETHER_ADDR_LEN); // Source MAC
ethhdr->ether_type = htons(ETHERTYPE_ARP); // ARP protocol
// ARP header
arp->hw_type = htons(ARPHDR_ETHER); // Hardware address type
arp->proto_type = htons(ETH_P_IP); // Protocol address type
arp->ha_len = ETH_ALEN; // Hardware address length
arp->pa_len = IP_ALEN; // Protocol address length
arp->opcode = htons(op); // ARP operation
memcpy(arp->source_add,(u_char *)ether_aton(smac),ETH_ALEN); // Source MAC
ipaddr = inet_addr(sip);
memcpy(arp->source_ip, (u_char *)&ipaddr, IP_ALEN); // Source IP
if(strcmp(dmac,"ff:ff:ff:ff:ff:ff"))
memcpy(arp->dest_add,(u_char *)ether_aton(dmac),ETH_ALEN); // Destination MAC
ipaddr = inet_addr(dip);
memcpy(arp->dest_ip, (u_char *)&ipaddr, IP_ALEN); // Destination IP
// Run packet!! Run!
// FreeBSD code
if(SOCK_TYPE == SOCK_RAW)
{
RETVAL = send_packet_bsd(dev,packet,packetsize);
}
// Linux code
else
{
RETVAL = send_packet_linux(dev,packet,packetsize);
}
}
OUTPUT:
RETVAL
char *
get_mac(dev)
unsigned char *dev;
CODE:
char tmp[20] = "unknown";
if(SOCK_TYPE == SOCK_RAW)
{
get_mac_bsd(dev,tmp);
}
else
{
get_mac_linux(dev,tmp);
}
RETVAL = tmp;
OUTPUT:
RETVAL
char *
arp_lookup(dev, ip)
unsigned char *dev;
unsigned char *ip;
CODE:
char tmp[20] = "unknown";
if(SOCK_TYPE == SOCK_RAW)
{
arp_lookup_bsd(dev,ip,tmp);
}
else
{
arp_lookup_linux(dev,ip,tmp);
}
RETVAL = tmp;
OUTPUT:
RETVAL
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