/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="name">DNS domain name that owns a resource record.</param>
/// <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 DnsRecord_CNAME Parse(string name, byte[] reply, ref int offset, int rdLength, int ttl)
{
string alias = "";
if (DnsTool.GetQName(reply, ref offset, ref alias))
{
return(new DnsRecord_CNAME(name, alias, ttl));
}
else
{
throw new ArgumentException("Invalid CNAME resource record data !");
}
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="name">DNS domain name that owns a resource record.</param>
/// <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 DnsRecord_NS Parse(string name, byte[] reply, ref int offset, int rdLength, int ttl)
{
// Name server name
string server = "";
if (DnsTool.GetQName(reply, ref offset, ref server))
{
return(new DnsRecord_NS(name, server, ttl));
}
else
{
throw new ArgumentException("Invalid NS resource record data !");
}
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="name">DNS domain name that owns a resource record.</param>
/// <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 DnsRecord_SRV Parse(string name, 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 = "";
DnsTool.GetQName(reply, ref offset, ref target);
return(new DnsRecord_SRV(name, priority, weight, port, target, ttl));
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="name">DNS domain name that owns a resource record.</param>
/// <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 DnsRecord_NAPTR Parse(string name, 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 = DnsTool.ReadCharacterString(reply, ref offset);
string services = DnsTool.ReadCharacterString(reply, ref offset);
string regexp = DnsTool.ReadCharacterString(reply, ref offset);
string replacement = "";
DnsTool.GetQName(reply, ref offset, ref replacement);
return(new DnsRecord_NAPTR(name, order, preference, flags, services, regexp, replacement, ttl));
}
/// <summary>
/// Parses resource record from reply data.
/// </summary>
/// <param name="name">DNS domain name that owns a resource record.</param>
/// <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 DnsRecord_MX Parse(string name, 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 server = "";
if (DnsTool.GetQName(reply, ref offset, ref server))
{
return(new DnsRecord_MX(name, pref, server, ttl));
}
else
{
throw new ArgumentException("Invalid MX resource record data !");
}
}