//*******************************************************************************************
//
// Function : arp_who_is
// Description : send arp request to destination ip, and save destination mac to dest_mac.
// call this function to find the destination mac address before send other packet.
//
//*******************************************************************************************
BYTE arp_who_is ( BYTE *rxtx_buffer, BYTE *dest_mac, BYTE *dest_ip )
{
BYTE i;
WORD dlength;
// send arp request packet to network
arp_send_request ( rxtx_buffer, dest_ip );
for ( i=0; i<10; i++ )
{
// Time out 10x10ms = 100ms
_delay_ms ( 10 );
dlength = enc28j60_packet_receive( rxtx_buffer, MAX_RXTX_BUFFER );
// destination ip address was found on network
if ( dlength )
{
if ( arp_packet_is_arp ( rxtx_buffer, (WORD_BYTES){ARP_OPCODE_REPLY_V} ) )
{
// copy destination mac address from arp reply packet to destination mac address
memcpy ( dest_mac, &rxtx_buffer[ ETH_SRC_MAC_P ], sizeof(MAC_ADDR) );
return 1;
}
}
}
// destination ip was not found on network
return 0;
}
static void ipneigh_send_nd ( const ip_addr_t * a, int unicast, const mac_addr_t * m)
{
// vdisp_prints_xy( 0, 56, VDISP_FONT_6x8, 0, "ND " );
if (memcmp(a, &zero_address, sizeof (zero_address.ipv4.zero) ) == 0) // is IPv4 address
{
arp_send_request (a, unicast, m);
}
}
static int cmd_arp(int argc, const cmd_args *argv)
{
const char *cmd;
if (argc == 1) {
arp_usage();
return -1;
}
cmd = argv[1].str;
if (argc == 2 && strncmp(cmd, "list", sizeof("list")) == 0) {
arp_cache_dump();
} else if (argc == 3 && strncmp(cmd, "query", sizeof("query")) == 0) {
const char *addr_s = argv[2].str;
uint32_t addr = str_ip_to_int(addr_s, strlen(addr_s));
arp_send_request(addr);
} else {
arp_usage();
}
return 0;
}
/**Gets an entry out of the arp table.
*
*/
arp_table_entry* arp_get_entry(ip_addr* ip)
{
return NULL;
printf("arp_get_entry 0\n");
int8_t pos = arp_table_contains(ip);
if(pos == -1)
{
arp_send_request(ip);
while(pos == -1)
{
printf("arp_get_entry 1\n");
pos = arp_table_contains(ip);
}
}
if(pos >= 0 && pos < arp_table_pos)
{
return arp_table+pos;
}
else
{
return NULL;
}
}
