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/*
* Mausezahn - A fast versatile traffic generator
* Copyright (C) 2008-2010 Herbert Haas
*
* 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.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, see http://www.gnu.org/licenses/gpl-2.0.html
*
*/
#include "mz.h"
#include "mops.h"
// Initialization function - specify defaults here!
//
int mops_init_pdesc_arp(struct mops *mp)
{
struct mops_ext_arp * pd;
char tmac[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
if (mp->p_desc == NULL) return 1; // p_desc not properly assigned
pd = mp->p_desc;
pd->hw_type = 0x0001;
pd->pr_type = 0x800;
pd->hw_size = 6;
pd->pr_size = 4;
pd->opcode = 0x0001; // request
memcpy ((void*) pd->sender_mac, (void*) tx.eth_src, 6);
memcpy ((void*) pd->target_mac, (void*) tmac, 6);
memcpy ((void*) pd->sender_ip, (void*) &tx.ip_src, 4);
memcpy ((void*) pd->target_ip, (void*) &tx.ip_src, 4);
pd->trailer = 18; // default is 18 byte trailer to get a 60 byte packet (instead of only 42)
return 0;
}
/////////////////////////////////////////////////////////////////////////////////
/////////////////////////////// Update functions ////////////////////////////////
//
// **** Here is a summary of mops tool functions: ****
//
// Adds single byte to msg
// int mops_msg_add_byte (struct mops *mp, u_int8_t data);
//
// Adds bit field in *previous* msg-byte using optional left-shift
// int mops_msg_add_field (struct mops *mp, u_int8_t data, int shift);
//
// Adds two bytes in network byte order to msg
// int mops_msg_add_2bytes (struct mops *mp, u_int16_t data);
//
// Adds four bytes in network byte order to msg
// int mops_msg_add_4bytes (struct mops *mp, u_int32_t data);
//
// Adds string of bytes with lenght len
// int mops_msg_add_string (struct mops *mp, u_int8_t *str, int len);
//
// Add counter to message
// int mops_msg_add_counter (struct mops *mp,
// int random, // 1=random, 0=use start/stop/step
// u_int32_t start, // HOST BYTE ORDER
// u_int32_t stop, // HOST BYTE ORDER
// u_int32_t step, // HOST BYTE ORDER
// int bytes // number of bytes used (1|2|4) - selects hton2 or hton4
// );
//
//
int mops_update_arp(struct mops * mp)
{
struct mops_ext_arp * pd;
int i;
pd = mp->p_desc;
if (pd==NULL) return 1; // no valid pointer to a p_desc
mp->msg_s = 0; // important! Otherwise the msg would get longer and longer after each call!
mops_msg_add_2bytes (mp, pd->hw_type);
mops_msg_add_2bytes (mp, pd->pr_type);
mops_msg_add_byte (mp, pd->hw_size);
mops_msg_add_byte (mp, pd->pr_size);
mops_msg_add_2bytes (mp, pd->opcode);
mops_msg_add_string (mp, pd->sender_mac, 6);
mops_msg_add_string (mp, pd->sender_ip, 4);
mops_msg_add_string (mp, pd->target_mac, 6);
mops_msg_add_string (mp, pd->target_ip, 4);
// Avoid buffer problems:
if (pd->trailer>2000)
{
pd->trailer=2000;
}
for (i=0; i<pd->trailer; i++)
{
mops_msg_add_byte (mp, 0x00);
}
return 0;
}
// ARP Service: Resolves MAC address of given IP address and interface
// The result is stored in the last argument 'mac'.
//
// EXAMPLE:
//
// u_int8_t mymac[6];
// int ip[4]={192,186,0,1};
//
// service_arp("eth0", ip, mymac);
// /* now mymac should contain the MAC address */
//
// RETURN VALUE: 0 upon success
// 1 upon error
//
int service_arp(char *dev, u_int8_t *ip, u_int8_t *mac)
{
int i, devind=0, dev_found=0;
struct mops * mp;
struct mops_ext_arp * pd;
char tmac[6] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
struct arp_table_struct *cur;
// MOPS framework already available?
if (mp_head==NULL) return 1;
// Get list index for that device:
for (i=0; i<device_list_entries; i++) {
if (strncmp(device_list[i].dev, dev, 16)==0) {
devind=i;
dev_found=1;
break;
}
}
if (dev_found==0) {
fprintf(stderr, " Warning: Unknown device (sysARP_service)\n");
return 1; // ERROR: device name not found !!!!
} else {
if (verbose) {
fprintf(stderr, " sysARP_service triggered through interface %s\n", dev);
}
}
// Look up mops table if already a sysARP packet is available
mp = mops_search_name (mp_head, "sysARP_service");
if (mp!=NULL) { // entry exists...stop if active!
if (mops_state(mp)==MOPS_STATE_ACTIVE) {
if (verbose==2) fprintf(stderr, " Warning: Stop active MOPS (sysARP_service)\n");
mops_destroy_thread(mp);
}
} else {
// Allocate a new packet
if ((mp = mops_alloc_packet(mp_head)) == NULL) {
fprintf(stderr, " sysARP_service: ERROR -- cannot allocate MOPS\n");
return 1; // Problem, memory full?
} else {
strncpy (mp->packet_name, "sysARP_service", 15);
mp->mz_system=1; // indicates MZ private packet
if (mops_ext_add_pdesc (mp, MOPS_ARP)) {
return 1; // error
}
}
}
// Configure ARP request:
mops_clear_layers(mp, MOPS_ALL);
mops_init_pdesc_arp(mp);
mp->verbose = 0;
mp->use_ETHER = 1;
mp->count = 1;
mp->eth_type = 0x806;
mz_strncpy(mp->device, dev, 16);
pd = mp->p_desc;
memcpy ((void*) pd->sender_mac, (void*) device_list[devind].mac_mops, 6);
memcpy ((void*) pd->target_mac, (void*) tmac, 6);
memcpy ((void*) pd->sender_ip, (void*) device_list[devind].ip_mops, 4);
pd->target_ip[0]=ip[0];
pd->target_ip[1]=ip[1];
pd->target_ip[2]=ip[2];
pd->target_ip[3]=ip[3];
mops_update_arp(mp);
mops_set_conf(mp);
// Send ARP request
if (mops_tx_simple (mp)) {
fprintf(stderr, " Warning: sysARP_service failed!\n");
return 1;
}
usleep(100000); // wait 100 ms
// Now hopefully we got an ARP response;
// look up in ARP cache
cur=device_list[devind].arp_table;
while(cur!=NULL) {
if ((cur->sip[0]==ip[0]) &&
(cur->sip[1]==ip[1]) &&
(cur->sip[2]==ip[2]) &&
(cur->sip[3]==ip[3])) { // entry found!
for (i=0; i<6; i++) {
mac[i] = cur->smac[i];
}
}
cur=cur->next;
}
return 0;
}
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