Training courses

Kernel and Embedded Linux

Bootlin training courses

Embedded Linux, kernel,
Yocto Project, Buildroot, real-time,
graphics, boot time, debugging...

Bootlin logo

Elixir Cross Referencer

; config options
server:
	target-fetch-policy: "0 0 0 0 0"
	qname-minimisation: "no"
	minimal-responses: no

stub-zone:
	name: "."
	stub-addr: 193.0.14.129 	# K.ROOT-SERVERS.NET.
CONFIG_END

SCENARIO_BEGIN Test ghost subdomain with extension reply in timewindow.

; K.ROOT-SERVERS.NET.
RANGE_BEGIN 0 100
	ADDRESS 193.0.14.129 
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
. 86400 IN NS
SECTION ANSWER
. 86400 IN NS	K.ROOT-SERVERS.NET.
SECTION ADDITIONAL
K.ROOT-SERVERS.NET.	86400 IN	A	193.0.14.129
ENTRY_END

ENTRY_BEGIN
MATCH opcode subdomain
ADJUST copy_id copy_query
REPLY QR NOERROR
SECTION QUESTION
com. IN NS
SECTION AUTHORITY
com.	86400 IN NS	a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net.	86400 IN 	A	192.5.6.30
ENTRY_END

RANGE_END

; a.gtld-servers.net.
; this is the one where example.com is delegated.
RANGE_BEGIN 0 100
	ADDRESS 192.5.6.30
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
com. IN NS
SECTION ANSWER
com.	86400 IN NS	a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net.	86400 IN 	A	192.5.6.30
ENTRY_END

ENTRY_BEGIN
MATCH opcode subdomain
ADJUST copy_id copy_query
REPLY QR NOERROR
SECTION QUESTION
example.com. IN NS
SECTION AUTHORITY
example.com.	IN NS	ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
ENTRY_END

ENTRY_BEGIN
MATCH opcode subdomain
ADJUST copy_id copy_query
REPLY QR NOERROR
SECTION QUESTION
example2.com. IN NS
SECTION AUTHORITY
example2.com.	3610 IN NS	ns.example2.com.
SECTION ADDITIONAL
ns.example2.com. 3610 IN A 1.2.3.5
ENTRY_END
RANGE_END

; a.gtld-servers.net.
; this is the one where example.com is no longer delegated.
RANGE_BEGIN 100 300
	ADDRESS 192.5.6.30
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
com. IN NS
SECTION ANSWER
com.	86400 IN NS	a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net.	86400 IN 	A	192.5.6.30
ENTRY_END

ENTRY_BEGIN
MATCH opcode subdomain
ADJUST copy_id copy_query
REPLY QR NXDOMAIN
SECTION QUESTION
example.com. IN NS
SECTION AUTHORITY
com.	86400 IN SOA a. b. 1 2 3 4 5
ENTRY_END

ENTRY_BEGIN
MATCH opcode subdomain
ADJUST copy_id copy_query
REPLY QR NXDOMAIN
SECTION QUESTION
example2.com. IN NS
SECTION AUTHORITY
com.	86400 IN SOA a. b. 1 2 3 4 5
ENTRY_END
RANGE_END

; ns.example.com.
RANGE_BEGIN 0 100
	ADDRESS 1.2.3.4
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com.	IN NS	ns.example.com.
SECTION ADDITIONAL
ns.example.com.		IN 	A	1.2.3.4
ENTRY_END

ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example.com. IN A
SECTION ANSWER
ns.example.com. IN A	1.2.3.4
SECTION AUTHORITY
example.com.	IN NS	ns.example.com.
ENTRY_END

ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example.com. IN AAAA
SECTION AUTHORITY
example.com.	IN NS	ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A	1.2.3.4
ENTRY_END

ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
www.example.com. IN A
SECTION ANSWER
www.example.com. IN A	10.20.30.40
SECTION AUTHORITY
example.com.	IN NS	ns.example.com.
SECTION ADDITIONAL
ns.example.com 	IN A 	1.2.3.4
ENTRY_END
RANGE_END

; ns.example2.com.
RANGE_BEGIN 0 100
	ADDRESS 1.2.3.5
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
example2.com. IN NS
SECTION ANSWER
example2.com.	3610 IN NS	ns.example2.com.
SECTION ADDITIONAL
ns.example2.com.		3610 IN 	A	1.2.3.5
ENTRY_END

ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example2.com. IN A
SECTION ANSWER
ns.example2.com. 3610 IN A	1.2.3.5
SECTION AUTHORITY
example2.com.	3610 IN NS	ns.example2.com.
ENTRY_END

ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example2.com. IN AAAA
SECTION AUTHORITY
example2.com.	3610 IN NS	ns.example2.com.
SECTION ADDITIONAL
ns.example2.com. 3610 IN A	1.2.3.5
ENTRY_END

ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
www.example2.com. IN A
SECTION ANSWER
www.example2.com. 3610 IN A	10.20.30.40
SECTION AUTHORITY
example2.com.	3610 IN NS	ns.example2.com.
SECTION ADDITIONAL
ns.example2.com 	3610 IN A 	1.2.3.5
ENTRY_END
RANGE_END

STEP 1 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
www.example.com. IN A
ENTRY_END

; get the delegation in cache
STEP 20 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA NOERROR
SECTION QUESTION
www.example.com. IN A
SECTION ANSWER
www.example.com. IN A	10.20.30.40
SECTION AUTHORITY
example.com.	IN NS	ns.example.com.
SECTION ADDITIONAL
ns.example.com 	IN A 	1.2.3.4
ENTRY_END

; get example2 in cache too to check other response type
STEP 30 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
www.example2.com. IN A
ENTRY_END

STEP 40 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA NOERROR
SECTION QUESTION
www.example2.com. IN A
SECTION ANSWER
www.example2.com. IN A	10.20.30.40
SECTION AUTHORITY
example2.com.	IN NS	ns.example2.com.
SECTION ADDITIONAL
ns.example2.com 	IN A 	1.2.3.5
ENTRY_END

; time passes
STEP 95 TIME_PASSES ELAPSE 3595

STEP 100 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
ns.example.com. IN A
ENTRY_END

; ns.example.com RANGE does not answer, only until step 100,
; so we provide an answer, but first, let time pass beyond the TTL.
; it is going to time 3605, just passed the 3600 expire TTL, but the
; query started at 3595 before the TTL expired.
STEP 110 TIME_PASSES ELAPSE 10 

; provide the answer to the query sent.
STEP 120 CHECK_OUT_QUERY
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example.com. IN A
SECTION ANSWER
SECTION AUTHORITY
example.com.	IN NS	ns.example.com.
SECTION ADDITIONAL
ns.example.com 	IN A 	1.2.3.4
ENTRY_END

STEP 130 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA NOERROR
SECTION QUESTION
ns.example.com. IN A
SECTION AUTHORITY
example.com.	IN NS	ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 	1.2.3.4
ENTRY_END

; check if the domain is still live.
STEP 140 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
www2.example.com. IN A
ENTRY_END

STEP 150 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA NXDOMAIN
SECTION QUESTION
www2.example.com. IN A
SECTION AUTHORITY
com.	86400 IN SOA a. b. 1 2 3 4 5
ENTRY_END

; example2 is valid with TTL of 3610, it is time 3605
STEP 160 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
ns.example2.com. IN A
ENTRY_END

; move to time 3615
STEP 170 TIME_PASSES ELAPSE 10 

STEP 180 CHECK_OUT_QUERY
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example2.com. IN A
SECTION ANSWER
ns.example2.com. 	IN A 	1.2.3.5
SECTION AUTHORITY
example2.com.	IN NS	ns.example2.com.
SECTION ADDITIONAL
ns.example2.com. 	IN A 	1.2.3.5
ENTRY_END

STEP 190 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA NOERROR
SECTION QUESTION
ns.example2.com. IN A
SECTION ANSWER
ns.example2.com 	IN A 	1.2.3.5
SECTION AUTHORITY
example2.com.	IN NS	ns.example2.com.
SECTION ADDITIONAL
ENTRY_END

; check if the domain is still live.
STEP 200 QUERY
ENTRY_BEGIN
REPLY RD
SECTION QUESTION
www2.example2.com. IN A
ENTRY_END

STEP 210 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA NXDOMAIN
SECTION QUESTION
www2.example2.com. IN A
SECTION AUTHORITY
com.	86400 IN SOA a. b. 1 2 3 4 5
ENTRY_END

SCENARIO_END