NAME

        CL_RFC3403_4_NAPTR_flagA - Flag "A" to control rewriting and interpretation

VERIFICATION POINTS

        Verify a NUT process when NUT received message that includes multiple 
        Naming Authority Pointer (NAPTR) Resource Records (RR) containing 
        different flags.

FLAGS

A containing flags to control aspects of the

rewriting and interpretation of the fields in the record. Flags

are single characters from the set A-Z and 0-9. The case of the

alphabetic characters is not significant. The field can be empty.

It is up to the Application specifying how it is using this

Database to define the Flags in this field. It must define which

ones are terminal and which ones are not.

If this flag is not present then this rule is non-terminal. If a

Rule is non-terminal then clients MUST use the Key produced by this

Rewrite Rule as the new Key in the DDDS loop (i.e., causing the

client to query for new NAPTR records at the domain-name that is the

result of this Rule).

The "A" flags are for a terminal lookup. This means that the Rule

is the last one and that the flag determines what the next stage

should be. "A" means that the output of the Rule is a domain-name

and should be used to lookup either A, AAAA, or A6 records for that

domain.

TARGET

        Client (ADVANCED)

SYNOPSIS

	CL_RFC3403_4_NAPTR_flagA.seq [-tooloption ...]: KOI tool option
	See also DNSConfig.pm

INITIALIZATION

Network Topology

        AP Server1(TN):A.example.com     DNS Server1(TN)
          |3ffe:501:ffff:101::10           |3ffe:501:ffff:101::20
          |192.168.1.10                    |192.168.1.20
          |                                |
Net-y   --+--------+-----------------------+-------- 3ffe:501:ffff:101::/64 
                   |                                 192.168.1/24
                   |
                   |
                 ROUTER1(TN)
                   |3ffe:501:ffff:100::1
                   |192.168.0.1
                   |
Net-z   --+--------+-------------------------------- 3ffe:501:ffff:100::/64 
          |                                          192.168.0/24
        DNS Client1(NUT)
           3ffe:501:ffff:100:XXXX
           192.168.0.10
	

	XXXX: EUI64 address

Setup

	Set the DNS Server1 (TN)'s address on DNS Client1 (NUT) as above mentioned Network Topology.
	DNS Client1 (NUT) needs a HTTP program as DDDS application.
	

	Application Unique String (AUS): http://www.example.com/dns/test.pdf
	Key: http
	Used domain-name to retrieve Rewrite Rules as NAPTR records: http.uri.arpa.

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (NUT)                               DNS Server1 (TN)
        |                                               |
        | Invoke some application                       |
        |    on NUT (Ex. HTTP)                          |
        |                                               |
        |---------------------------------------------->|
        | 1. Send standard query                        |
        |    QNAME="http.uri.arpa."                     |
        |    QTYPE=NAPTR                                |  
        |                                               |
        |<----------------------------------------------|
        | 2. Send standard query response               |
        |                                               |
        |---------------------------------------------->|
        | 3. Send standard query                        |
        |    QNAME="www.example.com"                    |
        |    QTYPE=NAPTR                                |  
        |                                               |
        |<----------------------------------------------|
        | 4. Send standard query response               |
        |                                               |
        |---------------------------------------------->|
        | 5. Send standard query                        |
        |    QNAME="http.example.com"                   |
        |    QTYPE=A or AAAA                            |  
        |                                               |
        v                                               v

        1. DNS Client1 (NUT) sends a standard query with QNAME = "http.uri.arpa." type = NAPTR 
        2. DNS Server1 (NUT) transmits a response to DNS Client1 (NUT) with:

           $ORIGIN http.uri.arpa. 
           ;;       order pref flags service  regexp                       replacement
           IN NAPTR 100   90   ""    ""       "!^http://([^/:]+)!1!i"      .

        3. DNS Client1 (NUT) sends a standard query with QNAME = "www.example.com." type = NAPTR. Judgment (Check *3)
        4. DNS Server1 (NUT) transmits a response to DNS Client1 (NUT) with:

           $ORIGIN www.example.com.
           ;;       order pref flags   service  regexp     replacement
            IN NAPTR 100  100  "a"   "http+N2C"   ""    http.example.com.

        5. DNS Client1 (NUT) sends a standard query with QNAME = "http.example.com." type = A or AAAA. Judgment (Check *5)

Packet Description

1st packet.

Standard query from DNS Client1 (NUT) to Server1 (TN)
IP Header	Source Address	NUT_NETZ
IP Header	Destination Address	SV1_NETY
UDP Header	Src Port	ANY
UDP Header	Dst Port	53
DNS Header	ID	ANY
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	http.uri.arpa.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)

2nd packet.

Standard query response from DNS Server1 (TN) to Client1 (NUT)
IP Header	Source Address	SV1_NETY
IP Header	Destination Address	NUT_NETZ
UDP Header	Src Port	53
UDP Header	Dst Port	Value that NUT uses
DNS Header	ID	Value that NUT uses
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	2
DNS Question section	QNAME	http.uri.arpa.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	http.uri.arpa. (Pointer 0xC00C)
	TYPE	NAPTR (0x0023)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	29
	ORDER	100
	PREFERENCE	90
	FLAGS	(not present)
	SERVICES	(not present)
	REGEXP	!^http://([^/:]+)!1!i
	REPLACEMENT	.
DNS Authority section	NAME	uri.arpa. (Pointer 0xC011)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	17
	NSDNAME	NS1.example.com
DNS Additional section	NAME	NS1.example.com (Pointer 0xC054)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	4
	ADDRESS	192.168.1.20
DNS Additional section	NAME	NS1.example.com (Pointer 0xC054)
	TYPE	AAAA (0x001C)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	16
	ADDRESS	3ffe:501:ffff:101::20

3rd packet.

Standard query from DNS Client1 (NUT) to Server1 (TN)
IP Header	Source Address	NUT_NETZ
IP Header	Destination Address	SV1_NETY
UDP Header	Src Port	ANY
UDP Header	Dst Port	53
DNS Header	ID	ANY
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	www.example.com.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)

4th packet.

Standard query response from DNS Server1 (TN) to Client1 (NUT)
IP Header	Source Address	SV1_NETY
IP Header	Destination Address	NUT_NETZ
UDP Header	Src Port	53
UDP Header	Dst Port	Value that NUT uses
DNS Header	ID	Value that NUT uses
	QR	1
	OPCODE	0
	AA	1
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	1
	NSCOUNT	1
	ARCOUNT	2
DNS Question section	QNAME	www.example.com.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	www.example.com. (Pointer 0xC00C)
	TYPE	NAPTR (0x0023)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	34
	ORDER	100
	PREFERENCE	100
	FLAGS	a
	SERVICES	http+N2C
	REGEXP	(not present)
	REPLACEMENT	http.example.com
DNS Authority section	NAME	example.com. (Pointer 0xC042)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	17
	NSDNAME	NS1.example.com
DNS Additional section	NAME	NS1.example.com (Pointer 0xC05B)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	4
	ADDRESS	192.168.1.20
DNS Additional section	NAME	NS1.example.com (Pointer 0xC05B)
	TYPE	AAAA (0x001C)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	16
	ADDRESS	3ffe:501:ffff:101::20

5th packet.

Standard query from DNS Client1 (NUT) to Server1 (TN)
IP Header	Source Address	NUT_NETZ
IP Header	Destination Address	SV1_NETY
UDP Header	Src Port	ANY
UDP Header	Dst Port	53
DNS Header	ID	ANY
	QR	0
	OPCODE	0
	AA	0
	TC	0
	RD	0
	RA	0
	Z	0
	RCODE	0
	QDCOUNT	1
	ANCOUNT	0
	NSCOUNT	0
	ARCOUNT	0
DNS Question section	QNAME	*http.example.com.*
	QTYPE	*A (0x0001) or AAAA (0x001C)*
	QCLASS	IN (0x0001)

Exp.

NUT_NETZ	DNS Client1's (NUT) Net-z address
SV1_NETY	DNS Server1's (TN) Net-y address

JUDGMENT

        3. Received a query message that it includes QNAME=www.example.com, TYPE=NAPTR.
        5. Received a query message that it includes QNAME=http.example.com, TYPE=A or AAAA.

TERMINATION

        If NUT has cache function, clear the cache.

REFERENCE

	RFC3403 Dynamic Delegation Discovery System (DDDS)
                Part Three: The Domain Name System (DNS) Database
	        4. NAPTR RR Format 
	RFC3404 Dynamic Delegation Discovery System (DDDS)
	        Part Four: The Uniform Resource Identifiers (URI)
	                      Resolution Application
	        5.3 Resolving an HTTP URI Scheme