/*
********************************************************************************
* MAKE DNS QUERY AND PARSE THE REPLY
*
* Description : This function makes DNS query message and parses the reply from DNS server.
* Arguments : name - is a pointer to the domain name.
* Returns : if succeeds : 1, fails : -1
* Note :
********************************************************************************
*/
uint8 dns_query(uint8 s, uint8 * name)
{
static uint32 dns_wait_time = 0;
struct dhdr dhp;
uint8 ip[4];
uint16 len, port;
switch(getSn_SR(s))
{
case SOCK_UDP:
if ((len = getSn_RX_RSR(s)) > 0)
{
if (len > MAX_DNS_BUF_SIZE) len = MAX_DNS_BUF_SIZE;
len = recvfrom(s, BUFPUB, len, ip, &port);
if(parseMSG(&dhp, BUFPUB))
{
close(s);
return DNS_RET_SUCCESS;
}
else
dns_wait_time = DNS_RESPONSE_TIMEOUT;
}
else
{
Delay_ms(1000);
dns_wait_time++;
//if(ConfigMsg.debug) printf("dns wait time=%d\r\n", dns_wait_time);
}
if(dns_wait_time >= DNS_RESPONSE_TIMEOUT) // 3ÃÊ
{
close(s);
return DNS_RET_FAIL;
}
break;
case SOCK_CLOSED:
dns_wait_time = 0;
socket(s, Sn_MR_UDP, 3000, 0);
//if(ConfigMsg.debug) printf("dns socket init over\r\n");
len = dns_makequery(0, name, BUFPUB, MAX_DNS_BUF_SIZE);
//if(ConfigMsg.debug) printf("dns make query\r\n");
sendto(s, BUFPUB, len, EXTERN_DNS_SERVERIP, IPPORT_DOMAIN);
break;
}
return DNS_RET_PROGRESS;
}
/*
********************************************************************************
* MAKE DNS QUERY AND PARSE THE REPLY
*
* Description : This function makes DNS query message and parses the reply from DNS server.
* Arguments : name - is a pointer to the domain name.
* Returns : if succeeds : 1, fails : -1
* Note :
********************************************************************************
*/
int DNS::query(char *name)
{
int state;
static uint32_t dns_wait_time = 0;
struct dhdr dhp;
uint8_t ip[4];
uint16_t len, port;
uint8_t dns_server_ip[4];
uint8_t BUFPUB[100];
get_local_dns(dns_server_ip);
len = makequery(0, (uint8_t *)name, BUFPUB, MAX_DNS_BUF_SIZE);
DNS_DBG("ÓòÃû:[%s]\r\n", name);
DNS_DBG("ÓòÃû½âÎöÖÐ...\r\n");
while(1)
{
state = socket_status(s);
if(state == SOCK_CLOSED)
{
DNS_DBG("dns's socket closed!,socket: %d\r\n", s);
DNS_DBG("openning dns's socket... !\r\n");
if(_socket(s, Sn_MR_UDP, port, 0) == 1)
DNS_DBG("open dns's socket seccusse!\r\n");
}
if(state == SOCK_UDP)
{
DNS_DBG("sending query cmd...\r\n");
if(_sendto(s, BUFPUB, len, dns_server_ip, IPPORT_DOMAIN) > 0)
DNS_DBG("send dns cmd ok!\r\n");
if ((len = recv_available(s)) > 0)
{
if (len > MAX_DNS_BUF_SIZE)
{
len = MAX_DNS_BUF_SIZE;
}
len = _recvfrom(s, BUFPUB, len, ip, &port);
DNS_DBG("receiv dns's date ok!datelen:%d\r\n", len);
if(parseMSG(&dhp, BUFPUB))
{
_close(s);
DNS_DBG("query is ok!\r\n");
return 1;
}
else
{
DNS_DBG("dns's date is bad!\r\n");
return -1;
}
}
else
{
DNS_DBG("wait dns's date...!\r\n");
delay_ms(1000);
dns_wait_time++;
}
if(dns_wait_time >= 3)
{
_close(s);
return -2;
}
}
};
}