NAME

        CL_RFC3403_4_NAPTR_flagS - Flag "S" 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 "S" flag means that the output of this Rule is a domain-name for

which one or more SRV records exist.

TARGET

        Client (ADVANCED)

SYNOPSIS

	CL_RFC3403_4_NAPTR_flagS.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 SIP user agent as DDDS application. 
	Note that it doesn't use SIP Proxy.
	

	Application Unique String (AUS): +81-90-1111-0003
	Converted to the Key: 819011110003
	Used domain-name to retrieve Rewrite Rules as NAPTR records: 3.0.0.0.1.1.1.1.0.9.1.8.e164.arpa.

TEST PROCEDURE

        This test sequence is following.

    DNS Client1 (NUT)                               DNS Server1 (TN)
        |                                               |
        | Invoke some application                       |
        |    on NUT (Ex. SIP UA)                        |
        |                                               |
        |---------------------------------------------->|
        | 1. Send standard query                        |
        |    QNAME="3.0.0.0.1.1.1.1.0.9.1.8.e164.arpa." |
        |    QTYPE=NAPTR                                |
        |                                               |
        |<----------------------------------------------|
        | 2. Send standard response                     |
        |                                               |
        |---------------------------------------------->|
        | 3. Send standard query                        |
        |    QNAME="sip.example.com"                    |
        |    QTYPE=NAPTR                                |  
        |                                               |
        |<----------------------------------------------|
        | 4. Send standard query response               |
        |                                               |
        |---------------------------------------------->|
        | 5. Send standard query                        |
        |    QNAME="_sip._udp.sip.example.com"          |
        |    QTYPE=SRV                                  |  
        |                                               |
        v                                               v

        1. DNS Client1 (NUT) sends a standard query with QNAME = "3.0.0.0.1.1.1.1.0.9.1.8.e164.arpa." type = NAPTR 
        2. DNS Server1 (NUT) transmits a response to DNS Client1 (NUT) with:

           $ORIGIN 3.0.0.0.1.1.1.1.0.9.1.8.e164.arpa.
            ;;       order pref flags service    regexp                              replacement
            IN NAPTR 0     0    "u"   "E2U+sip"  "!^.*$!sip:info1@sip.example.com!i"     .

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

           $ORIGIN sip.example.com.
            ;;       order pref flags service   regexp  replacement
            IN NAPTR 0     0    "s"   "SIP+D2U" ""      _sip._udp.sip.example.com.

        5. DNS Client1 (NUT) sends a standard query with QNAME = "_sip._udp.sip.example.com." type = SRV. 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	3.0.0.0.1.1.1.1.0.9.1.8.e164.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	3.0.0.0.1.1.1.1.0.9.1.8.e164.arpa.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	3.0.0.0.1.1.1.1.0.9.1.8.e164.arpa. (Pointer 0xC00C)
	TYPE	NAPTR (0x0023)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	45
	ORDER	0
	PREFERENCE	0
	FLAGS	u
	SERVICES	E2U+sip
	REGEXP	!^.*$!sip:info1@sip.example.com!i
	REPLACEMENT	.
DNS Authority section	NAME	1.1.1.1.0.9.1.8.e164.arpa. (Pointer 0xC014)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	17
	NSDNAME	NS1.example.com
DNS Additional section	NAME	NS1.example.com (Pointer 0xC07C)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	4
	ADDRESS	192.168.1.20
DNS Additional section	NAME	NS1.example.com (Pointer 0xC07C)
	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	sip.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	sip.example.com.
	QTYPE	NAPTR (0x0023)
	QCLASS	IN (0x0001)
DNS Answer section	NAME	sip.example.com. (Pointer 0xC00C)
	TYPE	NAPTR (0x0023)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	42
	ORDER	0
	PREFERENCE	0
	FLAGS	s
	SERVICES	SIP+D2U
	REGEXP	(not present)
	REPLACEMENT	_sip._udp.sip.example.com
DNS Authority section	NAME	example.com. (Pointer 0xC04A)
	TYPE	NS (0x0002)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	17
	NSDNAME	NS1.example.com (NS1 + Pointer 0xC04A)
DNS Additional section	NAME	NS1.example.com (Pointer 0xC063)
	TYPE	A (0x0001)
	CLASS	IN (0x0001)
	TTL	86400sec
	RDLENGTH	4
	ADDRESS	192.168.1.20
DNS Additional section	NAME	NS1.example.com (Pointer 0xC063)
	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	*_sip._udp.sip.example.com.*
	QTYPE	*SRV (0x0021)*
	QCLASS	IN (0x0001)

Exp.

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

JUDGMENT

        5. Received a query message that it includes QNAME=_sip._udp.sip.example.com, TYPE=SRV.

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 
	RFC3263 Session Initiation Protocol (SIP): Locating SIP Servers
	RFC2782 A DNS RR for specifying the location of services (DNS SRV)