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java.lang.Objectorg.xbill.DNS.EDNSOption
org.xbill.DNS.ClientSubnetOption
public class ClientSubnetOption
The Client Subnet EDNS Option, defined in http://tools.ietf.org/html/draft-vandergaast-edns-client-subnet-00 ("Client subnet in DNS requests"). The option is used to convey information about the IP address of the originating client, so that an authoritative server can make decisions based on this address, rather than the address of the intermediate caching name server. The option is transmitted as part of an OPTRecord in the additional section of a DNS message, as defined by RFC 2671 (EDNS0). An option code has not been assigned by IANA; the value 20730 (used here) is also used by several other implementations. The wire format of the option contains a 2-byte length field (1 for IPv4, 2 for IPv6), a 1-byte source netmask, a 1-byte scope netmask, and an address truncated to the source netmask length (where the final octet is padded with bits set to 0)
OPTRecord
Nested Class Summary |
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Nested classes/interfaces inherited from class org.xbill.DNS.EDNSOption |
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EDNSOption.Code |
Constructor Summary | |
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ClientSubnetOption(int sourceNetmask,
InetAddress address)
Construct a Client Subnet option with scope netmask set to 0. |
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ClientSubnetOption(int sourceNetmask,
int scopeNetmask,
InetAddress address)
Construct a Client Subnet option. |
Method Summary | |
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InetAddress |
getAddress()
Returns the IP address of the client. |
int |
getFamily()
Returns the family of the network address. |
int |
getScopeNetmask()
Returns the scope netmask. |
int |
getSourceNetmask()
Returns the source netmask. |
Methods inherited from class org.xbill.DNS.EDNSOption |
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equals, fromWire, getCode, hashCode, toString, toWire |
Methods inherited from class java.lang.Object |
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clone, finalize, getClass, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public ClientSubnetOption(int sourceNetmask, int scopeNetmask, InetAddress address)
sourceNetmask
- The length of the netmask pertaining to the query.
In replies, it mirrors the same value as in the requests.scopeNetmask
- The length of the netmask pertaining to the reply.
In requests, it MUST be set to 0. In responses, this may or may not match
the source netmask.address
- The address of the client.public ClientSubnetOption(int sourceNetmask, InetAddress address)
sourceNetmask
- The length of the netmask pertaining to the query.
In replies, it mirrors the same value as in the requests.address
- The address of the client.ClientSubnetOption
Method Detail |
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public int getFamily()
public int getSourceNetmask()
public int getScopeNetmask()
public InetAddress getAddress()
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