host_name
in a Server Name
Indication (SNI) extension.
As described in section 3, "Server Name Indication", of TLS Extensions (RFC 6066), "HostName" contains the fully qualified DNS hostname of the server, as understood by the client. The encoded server name value of a hostname is represented as a byte string using ASCII encoding without a trailing dot. This allows the support of Internationalized Domain Names (IDN) through the use of A-labels (the ASCII-Compatible Encoding (ACE) form of a valid string of Internationalized Domain Names for Applications (IDNA)) defined in RFC 5890.
Note that SNIHostName
objects are immutable.
- Since:
- 1.8
- See Also:
-
Constructor Summary
ConstructorDescriptionSNIHostName
(byte[] encoded) Creates anSNIHostName
using the specified encoded value.SNIHostName
(String hostname) Creates anSNIHostName
using the specified hostname. -
Method Summary
Modifier and TypeMethodDescriptionstatic SNIMatcher
createSNIMatcher
(String regex) Creates anSNIMatcher
object forSNIHostName
s.boolean
Compares this server name to the specified object.Returns theStandardCharsets.US_ASCII
-compliant hostname of thisSNIHostName
object.int
hashCode()
Returns a hash code value for thisSNIHostName
.toString()
Returns a string representation of the object, including the DNS hostname in thisSNIHostName
object.Methods declared in class javax.net.ssl.SNIServerName
getEncoded, getType
-
Constructor Details
-
SNIHostName
Creates anSNIHostName
using the specified hostname.Note that per RFC 6066, the encoded server name value of a hostname is
StandardCharsets.US_ASCII
-compliant. In this method,hostname
can be a user-friendly Internationalized Domain Name (IDN).IDN.toASCII(String, int)
is used to enforce the restrictions on ASCII characters in hostnames (see RFC 3490, RFC 1122, RFC 1123) and translate thehostname
into ASCII Compatible Encoding (ACE), as:IDN.toASCII(hostname, IDN.USE_STD3_ASCII_RULES);
The
hostname
argument is illegal if it:-
hostname
is empty, -
hostname
ends with a trailing dot, -
hostname
is not a valid Internationalized Domain Name (IDN) compliant with the RFC 3490 specification.
- Parameters:
hostname
- the hostname of this server name- Throws:
NullPointerException
- ifhostname
isnull
IllegalArgumentException
- ifhostname
is illegal
-
-
SNIHostName
public SNIHostName(byte[] encoded) Creates anSNIHostName
using the specified encoded value.This method is normally used to parse the encoded name value in a requested SNI extension.
Per RFC 6066, the encoded name value of a hostname is
StandardCharsets.US_ASCII
-compliant. However, in the previous version of the SNI extension ( RFC 4366), the encoded hostname is represented as a byte string using UTF-8 encoding. For the purpose of version tolerance, this method allows that the charset ofencoded
argument can beStandardCharsets.UTF_8
, as well asStandardCharsets.US_ASCII
.IDN.toASCII(String)
is used to translate theencoded
argument into ASCII Compatible Encoding (ACE) hostname.It is strongly recommended that this constructor is only used to parse the encoded name value in a requested SNI extension. Otherwise, to comply with RFC 6066, please always use
StandardCharsets.US_ASCII
-compliant charset and enforce the restrictions on ASCII characters in hostnames (see RFC 3490, RFC 1122, RFC 1123) forencoded
argument, or useSNIHostName(String)
instead.The
encoded
argument is illegal if it:-
encoded
is empty, -
encoded
ends with a trailing dot, -
encoded
is not encoded inStandardCharsets.US_ASCII
orStandardCharsets.UTF_8
-compliant charset, -
encoded
is not a valid Internationalized Domain Name (IDN) compliant with the RFC 3490 specification.
Note that the
encoded
byte array is cloned to protect against subsequent modification.- Parameters:
encoded
- the encoded hostname of this server name- Throws:
NullPointerException
- ifencoded
isnull
IllegalArgumentException
- ifencoded
is illegal
-
-
-
Method Details
-
getAsciiName
Returns theStandardCharsets.US_ASCII
-compliant hostname of thisSNIHostName
object.Note that, per RFC 6066, the returned hostname may be an internationalized domain name that contains A-labels. See RFC 5890 for more information about the detailed A-label specification.
- Returns:
- the
StandardCharsets.US_ASCII
-compliant hostname of thisSNIHostName
object
-
equals
Compares this server name to the specified object.Per RFC 6066, DNS hostnames are case-insensitive. Two server hostnames are equal if, and only if, they have the same name type, and the hostnames are equal in a case-independent comparison.
- Overrides:
equals
in classSNIServerName
- Parameters:
other
- the other server name object to compare with.- Returns:
- true if, and only if, the
other
is considered equal to this instance - See Also:
-
hashCode
public int hashCode()Returns a hash code value for thisSNIHostName
.The hash code value is generated using the case-insensitive hostname of this
SNIHostName
.- Overrides:
hashCode
in classSNIServerName
- Returns:
- a hash code value for this
SNIHostName
. - See Also:
-
toString
Returns a string representation of the object, including the DNS hostname in thisSNIHostName
object.The exact details of the representation are unspecified and subject to change, but the following may be regarded as typical:
"type=host_name (0), value=<hostname>"
The "<hostname>" is an ASCII representation of the hostname, which may contain A-labels. For example, a returned value of a pseudo hostname may look like:"type=host_name (0), value=www.example.com"
or"type=host_name (0), value=xn--fsqu00a.xn--0zwm56d"
Please NOTE that the exact details of the representation are unspecified and subject to change.
- Overrides:
toString
in classSNIServerName
- Returns:
- a string representation of the object.
-
createSNIMatcher
Creates anSNIMatcher
object forSNIHostName
s.This method can be used by a server to verify the acceptable
SNIHostName
s. For example,SNIMatcher matcher = SNIHostName.createSNIMatcher("www\\.example\\.com");
will accept the hostname "www.example.com".SNIMatcher matcher = SNIHostName.createSNIMatcher("www\\.example\\.(com|org)");
will accept hostnames "www.example.com" and "www.example.org".- Parameters:
regex
- the regular expression pattern representing the hostname(s) to match- Returns:
- a
SNIMatcher
object forSNIHostName
s - Throws:
NullPointerException
- ifregex
isnull
PatternSyntaxException
- if the regular expression's syntax is invalid
-