void arp_progress()
{
FLAG_ARPPR0CESS = 1;
arp_request();
while(FLAG_ARPPR0CESS);
}
void arp_timer(int delta)
{
struct arpentry *ae;
arp_cache_lock();
for (ae = arp_cache_head; ae < arp_cache_end; ae++) {
if (ae->ae_state == ARP_FREE)
continue;
ae->ae_ttl -= delta;
if (ae->ae_ttl <= 0) {
if ((ae->ae_state == ARP_WAITING && --ae->ae_retry < 0)
|| ae->ae_state == ARP_RESOLVED) {
if (ae->ae_state == ARP_WAITING)
arp_queue_drop(ae);
ae->ae_state = ARP_FREE;
} else {
/* retry arp request */
ae->ae_ttl = ARP_WAITTIME;
arp_cache_unlock();
arp_request(ae);
arp_cache_lock();
}
}
}
arp_cache_unlock();
}
static void timer(ENTRY *entry)
{
switch (entry->state) {
case as_resolv:
arp_request(entry->itf,entry->ip);
break;
case as_invalid:
if (entry->vccs) inarp_request(entry);
else if (!(entry->flags & ATF_ARPSRV))
diag(COMPONENT,DIAG_INFO,"as_invalid, no VCCs, but not "
"ARP server entry");
/* this is a valid condition if we're the ATMARP server
and the remote disconnected */
else if (!want_arp_srv(entry->itf)) STOP_TIMER(entry);
break;
case as_valid:
if (entry->flags & ATF_ARPSRV) {
if (!want_arp_srv(entry->itf)) STOP_TIMER(entry);
break;
}
/* fall through */
default:
diag(COMPONENT,DIAG_FATAL,"timer in state %d",entry->state);
}
}
int main(int argc, const char *argv[])
{
const char* ethdevide = NULL, * arpsrcip = NULL, * arpdstip = NULL, * arpsrcmac = NULL;
if (argc >= 5)
{
ethdevide = argv[2];
if (!strcmp(argv[1], "spoofMAC"))
arpsrcmac = argv[3];
else if (!strcmp(argv[1], "spoofIP"))
arpsrcip = argv[3];
else
goto error_format;
arpdstip = argv[4];
}
else
{
error_format:
printf("Useage: arp.exe EthDevice srcIP srcMAC, dstIP\n");
printf("Useage:\nfor spoofing ARPMAC: ./arp.exe spoofMAC Ethdevice arpMAC dstIP\n");
printf("for spoofing ARPIP: ./arp.exe spoofIP Ethdevice arpIP dstIP\n");
printf("the default is: h1 ping h2\n");
ethdevide = "h1-eth0";
/*
arpsrcip = "10.0.0.1";
arpsrcmac = "00:00:00:00:01";*/
arpdstip = "10.0.0.2";
}
arp_request(ethdevide, arpsrcip, arpsrcmac, arpdstip);
return 0;
}
MINI2440_STATUS arp_test(int argc, char(*argv)[MAX_COMMAND_LENGTH])
{
MINI2440_STATUS status = MINI2440_SUCCESS;
u32 isr_status = 0;
char recv_char[200] = {'\0'};
int test_times = 10;
dm9000_init();
print_string("arp_test\n");
delay(1000000);
while(test_times--)
{
arp_request();
delay(200000);
}
dm9000_int_clear();
return status;
}
static void revalidate(ENTRY *entry)
{
entry->state = as_resolv;
if (want_arp_srv(entry->itf) <= 0) return;
arp_request(entry->itf,entry->ip);
START_TIMER(entry,REPLY);
}
static int ping_send(void)
{
uchar *pkt;
int eth_hdr_size;
/* XXX always send arp request */
debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &net_ping_ip);
net_arp_wait_packet_ip = net_ping_ip;
eth_hdr_size = net_set_ether(net_tx_packet, net_null_ethaddr, PROT_IP);
pkt = (uchar *)net_tx_packet + eth_hdr_size;
set_icmp_header(pkt, net_ping_ip);
/* size of the waiting packet */
arp_wait_tx_packet_size = eth_hdr_size + IP_ICMP_HDR_SIZE;
/* and do the ARP request */
arp_wait_try = 1;
arp_wait_timer_start = get_timer(0);
arp_request();
return 1; /* waiting */
}
void arp_handle() {
//cprintf("receive arp .............................\n");
int * data = ethernet_rx_data + ETHERNET_HDR_LEN;
if(data[ARP_TYPE] == ARP_TYPE_REPLY) {
if(eth_memcmp(data + ARP_TARGET_IP, IP_ADDR, 4) != 0);
return;
int i=0;
for (i=0; i<4; i++)
cprintf("%d\n", *(data+ARP_SENDER_IP+i));
//tcp_request();
for (i = 0; i < 6; i++)
remote_mac[i] = *(data+ARP_SENDER_MAC+i);
}
else if (data[ARP_TYPE] == ARP_TYPE_REQUEST &&
data[ARP_TARGET_IP] == IP_ADDR[0] &&
data[ARP_TARGET_IP + 1] == IP_ADDR[1] &&
data[ARP_TARGET_IP + 2] == IP_ADDR[2] &&
data[ARP_TARGET_IP + 3] == IP_ADDR[3])
{
ethernet_tx_len = ETHERNET_HDR_LEN + ARP_BODY_LEN;
ethernet_set_tx(ethernet_rx_src, ETHERNET_TYPE_ARP);
int * buf = ethernet_tx_data + ETHERNET_HDR_LEN;
eth_memcpy(buf, ARP_FIX_HDR, 6 + 1);
buf[ARP_TYPE] = ARP_TYPE_REPLY;
eth_memcpy(buf + ARP_SENDER_MAC, MAC_ADDR, 6);
eth_memcpy(buf + ARP_SENDER_IP, IP_ADDR, 4);
eth_memcpy(buf + ARP_TARGET_MAC,
data + ARP_SENDER_MAC, 6);
eth_memcpy(buf + ARP_TARGET_IP,
data + ARP_SENDER_IP, 4);
cprintf("send arp response...\n");
ethernet_send();
}
else if (data[ARP_TYPE] == ARP_TYPE_REQUEST &&
data[ARP_TARGET_IP] == data[ARP_SENDER_IP] &&
data[ARP_TARGET_IP + 1] == data[ARP_SENDER_IP + 1] &&
data[ARP_TARGET_IP + 2] == data[ARP_SENDER_IP + 2] &&
data[ARP_TARGET_IP + 3] == data[ARP_SENDER_IP + 3]) //Is gratuitous = true
{
if (data[ARP_TARGET_IP] == tcp_dst_addr[0] &&
data[ARP_TARGET_IP + 1] == tcp_dst_addr[1] &&
data[ARP_TARGET_IP + 2] == tcp_dst_addr[2] &&
data[ARP_TARGET_IP + 3] == tcp_dst_addr[3])
{
int i;
for (i = 0; i < 6; i++)
remote_mac[i] = *(data+ARP_SENDER_MAC+i);
arp_request();
tcp_request();
}
}
}
void cache_add_packet(struct sr_instance * sr, uint8_t * packet, unsigned int length, char * interface, struct in_addr ip) {
struct in_addr dest_ip = next_hop_ip(sr, ip);
struct sr_arp_record *record = cache_lookup(sr, dest_ip);
if(record == NULL) {
// Check to see if there is an outstanding ARP request
struct sr_arp_request *request = cache_lookup_outstanding(sr, dest_ip);
if(request == NULL) {
// Create a new ARP request
if(arp_request(sr, dest_ip, interface) == 0) {
request = cache_add_request(sr, dest_ip);
// Add the recieved message to the outstanding arp request
cache_add_message(request, packet, length, interface, ip);
} /* endif: arp request sent succesfully */
else {
printf("ARP request failed for address %s - dropping packet.\n", inet_ntoa(ip));
} /* endelse: arp request not sent succesfully */
} /* endif: no outstanding ARP request */
else {
cache_add_message(request, packet, length, interface, ip);
} /* endelse: ARP request already outstanding for this ip */
} /* endif: No record */
else {
// Send packet
struct sr_ethernet_hdr *eth_hdr = (struct sr_ethernet_hdr *)packet;
memcpy(eth_hdr->ether_dhost, record->address, ETHER_ADDR_LEN);
sr_send_packet(sr, packet, length, interface);
} /* endelse: ARP record already exists */
}
int arp_resolve(char * ipdest, char * hwaddr) {
int i;
char proaddr[4];
struct arp_entry * entry;
if (differ_subnet(ipdest)) {
#if debug_arp
printf("Different SubNet: using Gateway IP address\r\n");
#endif
memcpy(proaddr, Gateway, 4);
}else {
memcpy(proaddr, ipdest, 4);
}
for(i=0;i<ARP_CACHE_SIZE;i++) {
entry = &arp_cache[i];
if (entry->state == ARP_ENTRY_FREE)
continue;
if ( memcmp(entry->proaddr, proaddr, 4)==0) {
memcpy(hwaddr, entry->hwaddr,6);
entry->queries++;
return ARP_ENTRY_FOUND;
}
}
arp_request(proaddr);
#if debug_arp
printf("ARP: Entry not found! Sending an ARP Request (Broadcast)\r\n");
#endif
return ARP_ENTRY_NOT_FOUND;
}
//-----------------------------------------------------------------------------------
// sending msg to syslog server defined in EEPROM
void syslog_send ( char *msg )
{
char *packet = (char *)(eth_buffer+UDP_DATA_START);
char *pp = packet;
int i = 0;
SYSLOG_DEBUG("SYSLOG send %s\r\n", msg);
(*((unsigned long*)&syslog_server_ip[0])) = para_getip(SYSLOG_IP_EEPROM_STORE,SYSLOG_IP);
SYSLOG_DEBUG("Server: %1i.%1i.%1i.%1i\r\n",syslog_server_ip[0],syslog_server_ip[1],syslog_server_ip[2],syslog_server_ip[3]);
//Arp-Request senden
unsigned long tmp_ip = (*(unsigned long*)&syslog_server_ip[0]);
if ( syslog_server_ip[3] != 0xFF ) // quickhack for broadcast address
if ( arp_entry_search(tmp_ip) >= MAX_ARP_ENTRY ) //Arp-Request senden?
for ( i=0; i<SYSLOG_ARPRETRIES && (arp_request(tmp_ip) != 1); i++ );
if (i>=SYSLOG_ARPRETRIES) {
SYSLOG_ERROR("No SYSLOG server!\r\n");
}
// building the packet structure
*pp++ = '<';
*pp++ = '0';
*pp++ = '>';
strcpy ( pp, msg );
create_new_udp_packet(strlen(packet),SYSLOG_CLIENT_PORT,SYSLOG_SERVER_PORT,tmp_ip);
}
static void arp_pack_func(void** state) {
// Nic initialization
void* malloc_pool = malloc(POOL_SIZE);
init_memory_pool(POOL_SIZE, malloc_pool, 0);
__nics[0] = malloc(sizeof(NIC));
__nic_count++;
__nics[0]->mac = 0x10c37b9309d1;
__nics[0]->pool_size = POOL_SIZE;
__nics[0]->pool = malloc_pool;
__nics[0]->output_buffer = fifo_create(8, malloc_pool);
__nics[0]->config = map_create(8, NULL, NULL, __nics[0]->pool);
uint32_t spa = 0xc0a80a6f;
uint32_t dpa = 0xc0a80a90;
arp_request(__nics[0], dpa, spa);
Packet* packet = fifo_pop(__nics[0]->output_buffer);
uint32_t comp_size = packet->end;
packet->end = 0;
arp_pack(packet);
// Checking packet->end
assert_int_equal(comp_size, packet->end);
destroy_memory_pool(malloc_pool);
free(malloc_pool);
malloc_pool = NULL;
}
bool_t
arp_resolve (T_IF_ADDR *ifaddr, T_NET_BUF *output, T_IN4_ADDR gw)
{
T_ARP_ENTRY *ent;
T_ETHER_HDR *eth;
T_IFNET *ifp = IF_GET_IFNET();
eth = GET_ETHER_HDR(output);
/*
* 次の場合は、イーサネットのブロードキャストアドレスを返す。
*
* ・全ビットが 1
* ・ホスト部の全ビットが 1 で、ネットワーク部がローカルアドレス
*/
if (gw == IPV4_ADDR_BROADCAST ||
gw == ((ifp->in_ifaddr.addr & ifp->in_ifaddr.mask) | ~ifp->in_ifaddr.mask)) {
memcpy(eth->dhost, ether_broad_cast_addr, ETHER_ADDR_LEN);
return true;
}
/* 送信先 GW の IP アドレスが ARP キャッシュにあるか調べる。*/
syscall(wai_sem(SEM_ARP_CACHE_LOCK));
ent = arp_lookup(gw, true);
if (ent->expire) {
memcpy(eth->dhost, ent->mac_addr, ETHER_ADDR_LEN);
syscall(sig_sem(SEM_ARP_CACHE_LOCK));
return true;
}
else {
/* 送信がペンデングされているフレームがあれば捨てる。*/
if (ent->hold) {
NET_COUNT_IP4(net_count_ip4[NC_IP4_OUT_ERR_PACKETS], 1);
syscall(rel_net_buf(ent->hold));
}
/*
* 送信をペンディングする。
* IF でネットワークバッファを開放しないフラグが設定されているときは、
* 送信をペンディングしない。
*/
if ((output->flags & NB_FLG_NOREL_IFOUT) == 0)
ent->hold = output;
else {
output->flags &= (uint8_t)~NB_FLG_NOREL_IFOUT;
ent->hold = NULL;
}
syscall(sig_sem(SEM_ARP_CACHE_LOCK));
/* アドレス解決要求を送信する。*/
arp_request(ifaddr, gw);
return false;
}
}
void Node::verify_arp_cache(string address)
{
time_t timestamp = time(0);
//Endereco nao esta na ARP Cache. Comecando o processo do ARP
if(arp_cache.size() < 1 || arp_cache.find(address) == arp_cache.end()) arp_request(this->arp_packet,address);
//Aguardando 15 segundos para o retorno de resposta, caso contrario, Timeout
while(arp_cache.find(address) == arp_cache.end()){
try { if(time(0)-timestamp > 15) throw TimeoutException(); }
catch(exception& e){ cout << e.what() << endl; break; }
}
}
int arp_lookup(struct netdevice* dev, uint32_t ip, mac dest) {
for (int e = 0; e < table.count; e++) {
if (table.ips[e] == ip) {
memcpy(dest, table.macs[e], 6);
return 1;
}
}
arp_request(dev, ip);
return 0;
}
struct arptab *arp_lookup(struct sk_buff *skb, __be32 daddr, unsigned char *mac)
{
struct arptab *entry;
pthread_spin_lock(&arp_lock);
entry = &arp_table[arp_hash(daddr)];
if (entry->status == ARP_STATUS_EMPTY)
{
arp_queue_try_insert(skb);
entry->status = ARP_STATUS_REQUEST;
pthread_spin_unlock(&arp_lock);
arp_request(daddr);
goto wait;
}
else if (entry->status == ARP_STATUS_REQUEST)
{
arp_queue_try_insert(skb);
pthread_spin_unlock(&arp_lock);
arp_request(daddr);
goto wait;
}
else
{
if (get_second() > entry->time + ARP_MAX_LIFE)
{
arp_queue_try_insert(skb);
entry->status = ARP_STATUS_REQUEST;
pthread_spin_unlock(&arp_lock);
arp_request(daddr);
goto wait;
}
else
{
memcpy(mac, entry->mac, ETH_ALEN);
pthread_spin_unlock(&arp_lock);
return entry;
}
}
wait:
return NULL;
}
void arp_poll(void) {
int i;
if (timer_expired(&arptimer)) { // 100 msec has elapsed
for(i=0; i<ARP_CACHE_SIZE; i++) {
if (arp_cache[i].state != ARP_ENTRY_FREE)
arp_cache[i].tout--;
}
timer_start(&arptimer, CLOCK_SECOND/10);// 100ms
}else
return;
for(i=0; i<ARP_CACHE_SIZE; i++) {
if (arp_cache[i].state == ARP_ENTRY_FREE)
continue;
if (arp_cache[i].tout == ARP_ENTRY_TIMED_OUT) {
switch(arp_cache[i].state) {
case ARP_ENTRY_OK:
arp_request(arp_cache[i].proaddr);
arp_cache[i].tout = ARP_REQUEST_TOUT;
arp_cache[i].state = ARP_ENTRY_RESOLVING;
break;
case ARP_ENTRY_RESOLVING:
if (arp_cache[i].retries > 0) {
arp_cache[i].retries--;
arp_request(arp_cache[i].proaddr);
arp_cache[i].tout = ARP_REQUEST_TOUT;
}else
arp_cache[i].state = ARP_ENTRY_FREE;
break;
default:
#if debug_arp
printf("ARP: Invalid State!\r\n");
#endif
;
}
}
}
}
//----------------------------------------------------------------------------
//HTTP Request an einen Webserver stelle
void http_request (void)
{
unsigned long index = MAX_TCP_ENTRY;
if (http_get_state > 1 && http_get_state < 20) http_get_state++;
if (http_get_state == 0)
{
//offnet eine Verbindung zu meinem Webserver
HTTPC_DEBUG("ARP Request\n\r");
unsigned int my_http_cp = 2354;
add_tcp_app (my_http_cp, (void(*)(unsigned char))test);
//ARP Request senden
if(arp_request (WEATHER_SERVER_IP))
{
for(unsigned long a=0;a<2000000;a++){asm("nop");};
tcp_port_open (WEATHER_SERVER_IP,LBBL_ENDIAN_INT(80),LBBL_ENDIAN_INT(my_http_cp));
unsigned char tmp_counter = 0;
while((index >= MAX_ARP_ENTRY) && (tcp_entry[index].app_status != 1))
{
index = tcp_entry_search (WEATHER_SERVER_IP,LBBL_ENDIAN_INT(80));
if (tmp_counter++ > 30)
{
HTTPC_DEBUG("TCP Eintrag nicht gefunden (HTTP_CLIENT)!\r\n");
return;
}
}
HTTPC_DEBUG("TCP Eintrag gefunden (HTTP_CLIENT)!\r\n");
tcp_entry[index].first_ack = 1;
http_get_state = 2;
}
else
{
http_get_state = 1;
}
}
//if (http_get_state == 10)
if (http_get_state > 10 && http_get_state < 20)
{
HTTPC_DEBUG("\r\n\r\n\r\nDaten Anfordern\r\n");
index = tcp_entry_search (WEATHER_SERVER_IP,LBBL_ENDIAN_INT(80));
memcpy_P(ð_buffer[TCP_DATA_START],WEATHER_GET_STRING,(sizeof(WEATHER_GET_STRING)-1));
tcp_entry[index].status = ACK_FLAG | PSH_FLAG;
create_new_tcp_packet((sizeof(WEATHER_GET_STRING)-1),index);
}
}
int net_send_udp_packet(uchar *ether, struct in_addr dest, int dport, int sport,
int payload_len)
{
uchar *pkt;
int eth_hdr_size;
int pkt_hdr_size;
/* make sure the net_tx_packet is initialized (net_init() was called) */
assert(net_tx_packet != NULL);
if (net_tx_packet == NULL)
return -1;
/* convert to new style broadcast */
if (dest.s_addr == 0)
dest.s_addr = 0xFFFFFFFF;
/* if broadcast, make the ether address a broadcast and don't do ARP */
if (dest.s_addr == 0xFFFFFFFF)
ether = (uchar *)net_bcast_ethaddr;
pkt = (uchar *)net_tx_packet;
eth_hdr_size = net_set_ether(pkt, ether, PROT_IP);
pkt += eth_hdr_size;
net_set_udp_header(pkt, dest, dport, sport, payload_len);
pkt_hdr_size = eth_hdr_size + IP_UDP_HDR_SIZE;
/* if MAC address was not discovered yet, do an ARP request */
if (memcmp(ether, net_null_ethaddr, 6) == 0) {
debug_cond(DEBUG_DEV_PKT, "sending ARP for %pI4\n", &dest);
/* save the ip and eth addr for the packet to send after arp */
net_arp_wait_packet_ip = dest;
arp_wait_packet_ethaddr = ether;
/* size of the waiting packet */
arp_wait_tx_packet_size = pkt_hdr_size + payload_len;
/* and do the ARP request */
arp_wait_try = 1;
arp_wait_timer_start = get_timer(0);
arp_request();
return 1; /* waiting */
} else {
debug_cond(DEBUG_DEV_PKT, "sending UDP to %pI4/%pM\n",
&dest, ether);
net_send_packet(net_tx_packet, pkt_hdr_size + payload_len);
return 0; /* transmitted */
}
}
void arp_send_request(ip_addr* ip)
{
eth_addr brdcast;
brdcast.words[0] = HTONS(0xffff);
brdcast.words[1] = HTONS(0xffff);
brdcast.words[2] = HTONS(0xffff);
buffer_t* buf = NULL;
buffer_create(buf, ARP_PLEN);
ethernet_gen_header(&brdcast, ETHERTYPE_ARP, buf->data);
ethernet_header* eh = (ethernet_header*)buf->data;
arp_request(ip, buf->data+sizeof(ethernet_header));
enc_prepare_ethernet_packet(eh);
enc_add_packet_data(buf->data+sizeof(ethernet_header), sizeof(arp_header));
enc_send_packet();
}
int arp_cache_get_haddr(in_addr_t iface, in_addr_t ip_addr, mac_addr_t haddr)
{
struct arp_cache_entry * entry = arp_cache_get_entry(ip_addr);
struct ip_route route;
if (entry && entry->age >= 0) {
memcpy(haddr, entry->haddr, sizeof(mac_addr_t));
return 0;
}
if (!ip_route_find_by_iface(iface, &route) &&
!arp_request(route.r_iface_handle, route.r_iface, ip_addr)) {
errno = EHOSTUNREACH;
}
return -1;
}
void shell_arp(void)
{
uint8_t tarip[] = {192,168,1,100};
uint8_t mode = atoi(cmd_pointer[1]);
if(ARP_TABLE == mode)
{
arp_show_table();
}
else if(ARP_REQ == mode)
{
arp_request(tarip);
printf("a arp packet to 192.168.1.100 send\n");
}
else
{
tcp_sockets_show();
}
}
void notifications__run(void) {
unsigned long index = MAX_TCP_ENTRY;
if (http_get_state < 1) {
HTTPC_DEBUG("httpc: ARP lookup for notification server\n\r");
unsigned int httpc__source_port = 2354;
add_tcp_app(httpc__source_port, (void(*)(unsigned char))httpc_acknowledge);
// Send ARP request
if (arp_request(NOTIFICATIONS__SERVER_HOST)) {
for(unsigned long a = 0;a < 2000000; a++) { asm("nop"); };
tcp_port_open(NOTIFICATIONS__SERVER_HOST, HTONS(NOTIFICATIONS__SERVER_PORT), htons(httpc__source_port));
unsigned char tmp_counter = 0;
while ((index >= MAX_ARP_ENTRY) && (tcp_entry[index].app_status != 1)) {
index = tcp_entry_search(NOTIFICATIONS__SERVER_HOST, HTONS(NOTIFICATIONS__SERVER_PORT));
if (tmp_counter++ > 30) {
HTTPC_DEBUG("httpc: tcp entry not found!\r\n");
return;
}
}
HTTPC_DEBUG("httpc: tcp entry found!\r\n");
tcp_entry[index].first_ack = 1;
++http_get_state;
}
else {
++http_get_state;
}
}
else if (http_get_state == 20000)
{
HTTPC_DEBUG("httpc: sending HTTP request\r\n");
index = tcp_entry_search(NOTIFICATIONS__SERVER_HOST, HTONS(NOTIFICATIONS__SERVER_PORT));
memcpy_P(ð_buffer[TCP_DATA_START], PUT_REQUEST, (sizeof(PUT_REQUEST)-1));
tcp_entry[index].status = ACK_FLAG | PSH_FLAG;
create_new_tcp_packet((sizeof(PUT_REQUEST)-1), index);
http_get_state = 20001;
}
else if (http_get_state < 20000) http_get_state++; // wait.. ugly
}
void vcc_connected(VCC *vcc)
{
ENTRY *entry;
diag(COMPONENT,DIAG_DEBUG,"connected VCC 0x%p",vcc);
if (!vcc->connecting)
diag(COMPONENT,DIAG_FATAL,"non-connecting VCC connected");
vcc->connecting = 0;
if (vcc->entry->flags & ATF_ARPSRV)
for (entry = vcc->entry->itf->table; entry; entry = entry->next)
if (entry->state == as_resolv) {
START_TIMER(entry,REPLY);
arp_request(entry->itf,entry->ip);
}
inarp_request(vcc->entry);
if (vcc->entry->state == as_valid)
if (set_ip(vcc->fd,vcc->entry->ip) < 0) {
diag(COMPONENT,DIAG_ERROR,"can't set IP (%s)",strerror(errno));
disconnect_vcc(vcc);
}
}
/**
* \ingroup tcpcmd
* \b PING-Befehl Sende "Ping" an angegebene Adresse
*/
int16_t command_ping (char *outbuffer)
{
uint32_t var = 0;
if (getLong(&var))
{
unsigned long dest_ip=0;
for (uint8_t i=0; i<4; ++i) {
dest_ip += (var<<(8*i));
if (!getLong(&var))
break;
}
//ARP Request senden
arp_request (dest_ip);
//ICMP-Nachricht Type=8 Code=0: Echo-Anfrage
//TODO: Sequenznummer, Identifier
icmp_send(dest_ip,0x08,0x00,1,1);
}
return 0;
}
void handle_timer() {
time_t crnt = time(NULL);
struct sr_arp_request *reqs = sr_handle->cache->requests;
struct sr_arp_request *prev = NULL;
while (reqs) {
if (difftime(crnt, reqs->time) > 1) {
if(reqs->repeated > MAX_REPEAT) {
printf("IP Unreachable\n");
ip_unreachable(sr_handle, reqs->messages->packet, reqs->messages->length, reqs->messages->interface);
if (!prev) {
sr_handle->cache->requests = reqs->next;
free(reqs);
reqs = reqs->next;
} else {
prev->next = reqs->next;
free(reqs);
reqs = prev->next;
}
}
else { // resend message
printf("Resending ARP\n");
arp_request(sr_handle, reqs->ip, next_hop(sr_handle, reqs->ip));
reqs->repeated++;
reqs->time = time(NULL);
}
}
else {
prev = reqs;
reqs = reqs->next;
}
}
}
int arp_timeout_check(void)
{
ulong t;
if (!net_arp_wait_packet_ip.s_addr)
return 0;
t = get_timer(0);
/* check for arp timeout */
if ((t - arp_wait_timer_start) > ARP_TIMEOUT) {
arp_wait_try++;
if (arp_wait_try >= ARP_TIMEOUT_COUNT) {
puts("\nARP Retry count exceeded; starting again\n");
arp_wait_try = 0;
net_set_state(NETLOOP_FAIL);
} else {
arp_wait_timer_start = t;
arp_request();
}
}
return 1;
}
//=====================================================================================
//
// * Function : request
// * Description
// target_ip로 ARP request packet을 보내는 스레드의 콜백함수
//
//=====================================================================================
DWORD WINAPI request(LPVOID arg)
{
arp_request(target_ip);
return 0;
}
int main(int argc, char *argv[]) {
char pcap_buff[PCAP_ERRBUF_SIZE]; // Error buffer used by pcap
size_t userin_len = 0;
ssize_t n;
int ret;
struct pcap_pkthdr *packet_hdr = NULL;
const u_char *packet_data = NULL;
char *userin = NULL;
char got_response;
init(argc, argv, pcap_buff);
while (!quit) {
// read user input
printf("Enter next IP address: ");
// getline malloc's userin, so free it each time
if (userin)
free(userin);
userin_len = 0;
n = getline(&userin, &userin_len, stdin);
if (n < 0) {
if (errno == EINTR)
break;
perror("getline failed");
exit(EXIT_FAILURE);
}
// remove new line
userin[n-1] = '\0';
if (0 == strcmp("", userin))
continue;
// send an ARP request
n = arp_request(pcap_handle, userin);
if (n < 0) {
printf("ARP request failed\n");
continue;
}
// wait for a response
got_response = 0;
// look for a response
while (!quit) {
// receive some data
alarm(RESP_TIMEOUT);
ret = pcap_next_ex(pcap_handle, &packet_hdr,
&packet_data);
if (ret < 0)
break; // timeout or error
// if the response is ours,
// display the result and break.
if (check_response(packet_hdr, packet_data)) {
got_response = 1;
break;
}
}
alarm(0); // disable timeout
if (!got_response) {
printf("MAC: Lookup failed\n");
}
}
if (userin)
free(userin);
if (pcap_handle)
pcap_close(pcap_handle);
return 0;
}
//----------------------------------------------------------------------------
//send query to DNS server
void dns_query(char *name)
{
unsigned char *nptr;
unsigned char n;
unsigned int byte_count;
unsigned long tmp_ip;
tmp_ip = (*(unsigned long*)&dns_server_ip[0]);
if (arp_request(tmp_ip) == 1) // if DNS server is answering to ARP
{
nptr = ð_buffer[UDP_DATA_START];
*nptr++ = 0x12; //ID h
*nptr++ = 0x34; //ID l
*nptr++ = 0x01; //Flags h FLAG_RD ->Standard query
*nptr++ = 0x00; //Flags l
*nptr++ = 0x00; //QDCOUNT h
*nptr++ = 0x01; //QDCOUNT l
*nptr++ = 0x00; //ANCOUNT h
*nptr++ = 0x00; //ANCOUNT l
*nptr++ = 0x00; //NSCOUNT h
*nptr++ = 0x00; //NSCOUNT l
*nptr++ = 0x00; //ARCOUNT h
*nptr++ = 0x00; //ARCOUNT l
byte_count = 12;
--name;
/* Convert hostname to query format. */
do
{
++name;
nptr = ð_buffer[UDP_DATA_START+byte_count]; //remember the first byte
byte_count++;
for(n = 0; *name != '.' && *name != 0; ++name) //copy the name
{
eth_buffer[UDP_DATA_START+byte_count] = *name;
byte_count++;
n++;
}
*nptr = n; //store the length in the first byte
}
while(*name != 0); //until name string is finished
//end of query:
eth_buffer[UDP_DATA_START+byte_count] = 0; //zero string
byte_count++;
eth_buffer[UDP_DATA_START+byte_count] = 0; //2 bytes QTYPE 1=a host address
byte_count++;
eth_buffer[UDP_DATA_START+byte_count] = 1; //
byte_count++;
eth_buffer[UDP_DATA_START+byte_count] = 0; //2 bytes QCLASS 1=Internet
byte_count++;
eth_buffer[UDP_DATA_START+byte_count] = 1; //
byte_count++;
create_new_udp_packet(byte_count,DNS_CLIENT_PORT,DNS_SERVER_PORT,tmp_ip);
dns_state = DNS_STATE_REQ_SENT;
return;
}
dns_state = DNS_STATE_REQ_ERR;
DNS_DEBUG("No DNS server!!\r\n");
}
