static void dns_send(void)
{
struct header *header;
int n, name_len;
uchar *p, *pkt;
const char *s;
const char *name;
enum dns_query_type qtype = DNS_A_RECORD;
name = net_dns_resolve;
pkt = (uchar *)(net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE);
p = pkt;
/* Prepare DNS packet header */
header = (struct header *)pkt;
header->tid = 1;
header->flags = htons(0x100); /* standard query */
header->nqueries = htons(1); /* Just one query */
header->nanswers = 0;
header->nauth = 0;
header->nother = 0;
/* Encode DNS name */
name_len = strlen(name);
p = (uchar *)&header->data; /* For encoding host name into packet */
do {
s = strchr(name, '.');
if (!s)
s = name + name_len;
n = s - name; /* Chunk length */
*p++ = n; /* Copy length */
memcpy(p, name, n); /* Copy chunk */
p += n;
if (*s == '.')
n++;
name += n;
name_len -= n;
} while (*s != '\0');
*p++ = 0; /* Mark end of host name */
*p++ = 0; /* Some servers require double null */
*p++ = (unsigned char) qtype; /* Query Type */
*p++ = 0;
*p++ = 1; /* Class: inet, 0x0001 */
n = p - pkt; /* Total packet length */
debug("Packet size %d\n", n);
dns_our_port = random_port();
net_send_udp_packet(net_server_ethaddr, net_dns_server,
DNS_SERVICE_PORT, dns_our_port, n);
debug("DNS packet sent\n");
}
static void nc_send_packet(const char *buf, int len)
{
#ifdef CONFIG_DM_ETH
struct udevice *eth;
#else
struct eth_device *eth;
#endif
int inited = 0;
uchar *pkt;
uchar *ether;
struct in_addr ip;
debug_cond(DEBUG_DEV_PKT, "output: \"%*.*s\"\n", len, len, buf);
eth = eth_get_dev();
if (eth == NULL)
return;
if (!memcmp(nc_ether, net_null_ethaddr, 6)) {
if (eth_is_active(eth))
return; /* inside net loop */
output_packet = buf;
output_packet_len = len;
input_recursion = 1;
net_loop(NETCONS); /* wait for arp reply and send packet */
input_recursion = 0;
output_packet_len = 0;
return;
}
if (!eth_is_active(eth)) {
if (eth_is_on_demand_init()) {
if (eth_init() < 0)
return;
eth_set_last_protocol(NETCONS);
} else {
eth_init_state_only();
}
inited = 1;
}
pkt = (uchar *)net_tx_packet + net_eth_hdr_size() + IP_UDP_HDR_SIZE;
memcpy(pkt, buf, len);
ether = nc_ether;
ip = nc_ip;
net_send_udp_packet(ether, ip, nc_out_port, nc_in_port, len);
if (inited) {
if (eth_is_on_demand_init())
eth_halt();
else
eth_halt_state_only();
}
}
/**
* Called from net_loop in net/net.c before each packet
*/
void nc_start(void)
{
refresh_settings_from_env();
if (!output_packet_len || memcmp(nc_ether, net_null_ethaddr, 6)) {
/* going to check for input packet */
net_set_udp_handler(nc_handler);
net_set_timeout_handler(net_timeout, nc_timeout_handler);
} else {
/* send arp request */
uchar *pkt;
net_set_arp_handler(nc_wait_arp_handler);
pkt = (uchar *)net_tx_packet + net_eth_hdr_size() +
IP_UDP_HDR_SIZE;
memcpy(pkt, output_packet, output_packet_len);
net_send_udp_packet(nc_ether, nc_ip, nc_out_port, nc_in_port,
output_packet_len);
}
}