C++ (Cpp) arp_send_reply Examples

Example #1

File: arp.c Project: Fanfwe/tinytcpip

void arp_handle(unsigned char *src_mac, unsigned char *data, unsigned short len)
{
  struct arp_hdr *pkt = (struct arp_hdr *)data;

  switch (ntohs(pkt->oper))
    {
    case ARP_OPER_REQUEST:
#ifdef DEBUG_ARP
      printf("ARP Request for %d.%d.%d.%d\n",
	     pkt->tpa[0], pkt->tpa[1],
	     pkt->tpa[2], pkt->tpa[3]);
#endif /* DEBUG_ARP */
      arp_table_add(pkt->spa, pkt->sha);
      if (memcmp(pkt->tpa, ip_address, 4) == 0)
	arp_send_reply(src_mac, pkt->sha, pkt->spa, pkt->tpa);
      break;
    case ARP_OPER_REPLY:
#ifdef DEBUG_ARP
      printf("ARP Reply\n");
#endif /* DEBUG_ARP */
      arp_table_add(pkt->spa, pkt->sha);
      break;
    default:
      break;
    }
}

Example #2

File: sr_router.c Project: ingrid-chan92/cs144_lab5

void processArp(struct sr_instance *sr , uint8_t *packet, unsigned int len, char *interface) {

	struct sr_arp_hdr *arpHeader = (struct sr_arp_hdr *) (packet + sizeof(struct sr_ethernet_hdr));

	/* Put ARP header into cache */
	struct sr_arpreq *req = sr_arpcache_insert(&(sr->cache), arpHeader->ar_sha, ntohl(arpHeader->ar_sip));
	if (req != NULL) {

		/* Found requests in queue waiting for this reply. Send all waiting packets */ 
		struct sr_packet *waiting = req->packets;
		struct sr_rt *rt = findLongestMatchPrefix(sr->routing_table, htonl(req->ip));

		while (waiting != NULL) {
			send_packet_to_dest(sr, waiting->buf, waiting->len, rt->interface, arpHeader->ar_sha, arpHeader->ar_sip);
			waiting = waiting->next;
		}

		/* Destroy arp request when complete */
		sr_arpreq_destroy(&(sr->cache), req);
	}

	if (ntohs(arpHeader->ar_op) == arp_op_request) {
		/* Reply to sender with our information */
		arp_send_reply(sr, packet, len, interface);
	}

}

Example #3

File: main.c Project: TanND/Electronic

//*****************************************************************************************
//
// Function : server_process
// Description : Run web server and listen on port 80
//
//*****************************************************************************************
void server_process ( void )
{
	MAC_ADDR client_mac;
	IP_ADDR client_ip;
	// you can change rx,tx buffer size in includes.h
	BYTE rxtx_buffer[MAX_RXTX_BUFFER];
	WORD plen;
	
	if ( flag1.bits.syn_is_sent )
		return;
	// get new packet
	plen = enc28j60_packet_receive( (BYTE*)&rxtx_buffer, MAX_RXTX_BUFFER );
	
	//plen will ne unequal to zero if there is a valid packet (without crc error)
	if(plen==0)
		return;

	// copy client mac address from buffer to client mac variable
	memcpy ( (BYTE*)&client_mac, &rxtx_buffer[ ETH_SRC_MAC_P ], sizeof(MAC_ADDR) );
	
	// check arp packet if match with avr ip let's send reply
	if ( arp_packet_is_arp( rxtx_buffer, (WORD_BYTES){ARP_OPCODE_REQUEST_V} ) )
	{
		arp_send_reply ( (BYTE*)&rxtx_buffer, (BYTE*)&client_mac );
		return;
	}

	// get client ip address
	memcpy ( (BYTE*)&client_ip, &rxtx_buffer[ IP_SRC_IP_P ], sizeof(IP_ADDR) );
	// check ip packet send to avr or not?
	if ( ip_packet_is_ip ( (BYTE*)&rxtx_buffer ) == 0 )
	{
		return;
	}

	// check packet if packet is icmp packet let's send icmp echo reply
	if ( icmp_send_reply ( (BYTE*)&rxtx_buffer, (BYTE*)&client_mac, (BYTE*)&client_ip ) )
	{
		return;
	}
	
	// start web server at port 80, see http.c
	http_webserver_process ( (BYTE*)rxtx_buffer, (BYTE*)&client_mac, (BYTE*)&client_ip );
}