/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="reply">DNS server reply data.</param>
/// <param name="offset">Current offset in reply data.</param>
/// <param name="rdLength">Resource record data length.</param>
/// <param name="ttl">Time to live in seconds.</param>
public static DNS_rr_CNAME Parse(byte[] reply, ref int offset, int rdLength, int ttl)
{
string name = "";
if (Dns_Client.GetQName(reply, ref offset, ref name))
{
return(new DNS_rr_CNAME(name, ttl));
}
else
{
throw new ArgumentException("Invalid CNAME resource record data !");
}
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="reply">DNS server reply data.</param>
/// <param name="offset">Current offset in reply data.</param>
/// <param name="rdLength">Resource record data length.</param>
/// <param name="ttl">Time to live in seconds.</param>
public static DNS_rr_SRV Parse(byte[] reply, ref int offset, int rdLength, int ttl)
{
// Priority Weight Port Target
// Priority
int priority = reply[offset++] << 8 | reply[offset++];
// Weight
int weight = reply[offset++] << 8 | reply[offset++];
// Port
int port = reply[offset++] << 8 | reply[offset++];
// Target
string target = "";
Dns_Client.GetQName(reply, ref offset, ref target);
return new DNS_rr_SRV(priority, weight, port, target, ttl);
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="reply">DNS server reply data.</param>
/// <param name="offset">Current offset in reply data.</param>
/// <param name="rdLength">Resource record data length.</param>
/// <param name="ttl">Time to live in seconds.</param>
public static DNS_rr_NAPTR Parse(byte[] reply, ref int offset, int rdLength, int ttl)
{
/* RFC 3403.
* The packet format for the NAPTR record is as follows
* 1 1 1 1 1 1
* 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| ORDER |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| PREFERENCE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| / FLAGS /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| / SERVICES /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| / REGEXP /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| / REPLACEMENT /
| / /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
*/
int order = reply[offset++] << 8 | reply[offset++];
int preference = reply[offset++] << 8 | reply[offset++];
string flags = Dns_Client.ReadCharacterString(reply, ref offset);
string services = Dns_Client.ReadCharacterString(reply, ref offset);
string regexp = Dns_Client.ReadCharacterString(reply, ref offset);
string replacement = "";
Dns_Client.GetQName(reply, ref offset, ref replacement);
return(new DNS_rr_NAPTR(order, preference, flags, services, regexp, replacement, ttl));
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="reply">DNS server reply data.</param>
/// <param name="offset">Current offset in reply data.</param>
/// <param name="rdLength">Resource record data length.</param>
/// <param name="ttl">Time to live in seconds.</param>
public static DNS_rr_MX Parse(byte[] reply, ref int offset, int rdLength, int ttl)
{
/* RFC 1035 3.3.9. MX RDATA format
*
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| PREFERENCE |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| / EXCHANGE /
| / /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
| where:
|
| PREFERENCE
| A 16 bit integer which specifies the preference given to
| this RR among others at the same owner. Lower values
| are preferred.
|
| EXCHANGE
| A <domain-name> which specifies a host willing to act as
| a mail exchange for the owner name.
*/
int pref = reply[offset++] << 8 | reply[offset++];
string name = "";
if (Dns_Client.GetQName(reply, ref offset, ref name))
{
return(new DNS_rr_MX(pref, name, ttl));
}
else
{
throw new ArgumentException("Invalid MX resource record data !");
}
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="reply">DNS server reply data.</param>
/// <param name="offset">Current offset in reply data.</param>
/// <param name="rdLength">Resource record data length.</param>
/// <param name="ttl">Time to live in seconds.</param>
public static DNS_rr_SOA Parse(byte[] reply, ref int offset, int rdLength, int ttl)
{
/* RFC 1035 3.3.13. SOA RDATA format
*
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
* / MNAME /
* / /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
* / RNAME /
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| SERIAL |
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| REFRESH |
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| RETRY |
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| EXPIRE |
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
| MINIMUM |
| |
+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+
|
| where:
|
| MNAME The <domain-name> of the name server that was the
| original or primary source of data for this zone.
|
| RNAME A <domain-name> which specifies the mailbox of the
| person responsible for this zone.
|
| SERIAL The unsigned 32 bit version number of the original copy
| of the zone. Zone transfers preserve this value. This
| value wraps and should be compared using sequence space
| arithmetic.
|
| REFRESH A 32 bit time interval before the zone should be
| refreshed.
|
| RETRY A 32 bit time interval that should elapse before a
| failed refresh should be retried.
|
| EXPIRE A 32 bit time value that specifies the upper limit on
| the time interval that can elapse before the zone is no
| longer authoritative.
|
| MINIMUM The unsigned 32 bit minimum TTL field that should be
| exported with any RR from this zone.
*/
//---- Parse record -------------------------------------------------------------//
// MNAME
string nameserver = "";
Dns_Client.GetQName(reply, ref offset, ref nameserver);
// RNAME
string adminMailBox = "";
Dns_Client.GetQName(reply, ref offset, ref adminMailBox);
char[] adminMailBoxAr = adminMailBox.ToCharArray();
for (int i = 0; i < adminMailBoxAr.Length; i++)
{
if (adminMailBoxAr[i] == '.')
{
adminMailBoxAr[i] = '@';
break;
}
}
adminMailBox = new string(adminMailBoxAr);
// SERIAL
long serial = reply[offset++] << 24 | reply[offset++] << 16 | reply[offset++] << 8 |
reply[offset++];
// REFRESH
long refresh = reply[offset++] << 24 | reply[offset++] << 16 | reply[offset++] << 8 |
reply[offset++];
// RETRY
long retry = reply[offset++] << 24 | reply[offset++] << 16 | reply[offset++] << 8 |
reply[offset++];
// EXPIRE
long expire = reply[offset++] << 24 | reply[offset++] << 16 | reply[offset++] << 8 |
reply[offset++];
// MINIMUM
long minimum = reply[offset++] << 24 | reply[offset++] << 16 | reply[offset++] << 8 |
reply[offset++];
//--------------------------------------------------------------------------------//
return(new DNS_rr_SOA(nameserver, adminMailBox, serial, refresh, retry, expire, minimum, ttl));
}