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/**
* @file
*
* This test program processes all ARP requests and claims every IP address it
* notices. Use with care in production networks.
*/
/*
* Copyright (c) 2014 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/types.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <net/ethernet.h>
#include <arpa/inet.h>
#include <netinet/in.h>
#include <assert.h>
#include <ifaddrs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <rtems/bsd/util.h>
#define TEST_NAME "LIBBSD ARP HOLE"
#define TEST_STATE_USER_INPUT 1
typedef struct {
struct ether_header eh;
struct arphdr arh;
uint8_t sha[ETHER_ADDR_LEN];
uint32_t spa;
uint8_t tha[ETHER_ADDR_LEN];
uint32_t tpa;
} __packed arp_request;
static void
arp_processor(void *arg, int fd, const uint8_t eaddr[ETHER_ADDR_LEN],
const struct arphdr *ar, uint32_t spa, uint32_t tpa,
const uint8_t *sha, const uint8_t *tha)
{
if (ar->ar_op == htons(ARPOP_REQUEST) && spa == htonl(INADDR_ANY) &&
tpa != htonl(INADDR_ANY)) {
arp_request arr;
memcpy(&arr.eh.ether_shost[0], &eaddr[0], ETHER_HDR_LEN);
memcpy(&arr.eh.ether_dhost[0], sha, ETHER_HDR_LEN);
arr.eh.ether_type = htons(ETHERTYPE_ARP);
arr.arh.ar_hrd = htons(ARPHRD_ETHER);
arr.arh.ar_pro = htons(ETHERTYPE_IP);
arr.arh.ar_hln = ETHER_ADDR_LEN;
arr.arh.ar_pln = sizeof(spa);
arr.arh.ar_op = htons(ARPOP_REPLY);
memcpy(&arr.sha[0], &eaddr[0], ETHER_ADDR_LEN);
arr.spa = tpa;
memcpy(&arr.tha[0], sha, ETHER_ADDR_LEN);
arr.tpa = htonl(INADDR_ANY);
write(fd, &arr, sizeof(arr));
}
}
static void
test_main(void)
{
char ifnamebuf[IF_NAMESIZE];
char *ifname;
rtems_bsd_arp_processor_context *ctx;
ifname = if_indextoname(1, &ifnamebuf[0]);
assert(ifname != NULL);
ctx = rtems_bsd_arp_processor_create(ifname);
assert(ctx != NULL);
while (1) {
rtems_bsd_arp_processor_process(ctx, arp_processor, NULL);
}
}
#define DEFAULT_NETWORK_NO_STATIC_IFCONFIG
#include <rtems/bsd/test/default-network-init.h>
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