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Fixup lameness handling in server selection.

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git-svn-id: file:///svn/unbound/trunk@1735 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards 2009-07-21 13:52:39 +00:00
parent 72aa0bad92
commit 894ba681f0
5 changed files with 477 additions and 6 deletions
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4
doc/Changelog
View file

@ -1,3 +1,7 @@
21 July 2009: Wouter
- Fix server selection, so that it waits for open target queries when
faced with lameness.
20 July 2009: Wouter
- Ignore transient sendto errors, no route to host, and host, net down.
- contrib/update-anchor.sh has -r option for root-hints.

8
iterator/iter_utils.c
View file

@ -233,7 +233,7 @@ iter_fill_rtt(struct iter_env* iter_env, struct module_env* env,
static int
iter_filter_order(struct iter_env* iter_env, struct module_env* env,
uint8_t* name, size_t namelen, uint16_t qtype, uint32_t now,
struct delegpt* dp, int* selected_rtt)
struct delegpt* dp, int* selected_rtt, int open_target)
{
int got_num = 0, low_rtt = 0, swap_to_front;
struct delegpt_addr* a, *n, *prev=NULL;
@ -244,7 +244,7 @@ iter_filter_order(struct iter_env* iter_env, struct module_env* env,
if(got_num == 0)
return 0;
if(low_rtt >= USEFUL_SERVER_TOP_TIMEOUT &&
delegpt_count_missing_targets(dp) > 0)
(delegpt_count_missing_targets(dp) > 0 || open_target > 0))
return 0; /* we want more choice. The best choice is a bad one.
return 0 to force the caller to fetch more */
@ -286,13 +286,13 @@ struct delegpt_addr*
iter_server_selection(struct iter_env* iter_env,
struct module_env* env, struct delegpt* dp,
uint8_t* name, size_t namelen, uint16_t qtype, int* dnssec_expected,
int* chase_to_rd)
int* chase_to_rd, int open_target)
{
int sel;
int selrtt;
struct delegpt_addr* a, *prev;
int num = iter_filter_order(iter_env, env, name, namelen, qtype,
*env->now, dp, &selrtt);
*env->now, dp, &selrtt, open_target);
if(num == 0)
return NULL;

4
iterator/iter_utils.h
View file

@ -79,13 +79,15 @@ int iter_apply_cfg(struct iter_env* iter_env, struct config_file* cfg);
* these are not preferred, but are used as a last resort.
* @param chase_to_rd: set to 1 if a known recursion lame server is selected
* these are not preferred, but are used as a last resort.
* @param open_target: number of currently outstanding target queries.
* If we wait for these, perhaps more server addresses become available.
* @return best target or NULL if no target.
* if not null, that target is removed from the result list in the dp.
*/
struct delegpt_addr* iter_server_selection(struct iter_env* iter_env,
struct module_env* env, struct delegpt* dp, uint8_t* name,
size_t namelen, uint16_t qtype, int* dnssec_expected,
int* chase_to_rd);
int* chase_to_rd, int open_target);
/**
* Allocate dns_msg from parsed msg, in regional.

2
iterator/iterator.c
View file

@ -1326,7 +1326,7 @@ processQueryTargets(struct module_qstate* qstate, struct iter_qstate* iq,
/* Select the next usable target, filtering out unsuitable targets. */
target = iter_server_selection(ie, qstate->env, iq->dp,
iq->dp->name, iq->dp->namelen, iq->qchase.qtype,
&iq->dnssec_expected, &iq->chase_to_rd);
&iq->dnssec_expected, &iq->chase_to_rd, iq->num_target_queries);
/* If no usable target was selected... */
if(!target) {

465
testdata/iter_dnsseclame_bug.rpl vendored Normal file
View file

@ -0,0 +1,465 @@
; config options
server:
trust-anchor: "example.com. 3600 IN DS 2854 3 1 46e4ffc6e9a4793b488954bd3f0cc6af0dfb201b"
val-override-date: "20070916134226"
stub-zone:
name: "."
stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
CONFIG_END
SCENARIO_BEGIN Bug test dnssec-lame detection at ds point with target queries.
; K.ROOT-SERVERS.NET.
RANGE_BEGIN 0 100
ADDRESS 193.0.14.129
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
. IN NS
SECTION ANSWER
. IN NS K.ROOT-SERVERS.NET.
SECTION ADDITIONAL
K.ROOT-SERVERS.NET. 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 A
SECTION AUTHORITY
com. IN NS a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net. IN A 192.5.6.30
ENTRY_END
ENTRY_BEGIN
MATCH opcode subdomain
ADJUST copy_id copy_query
REPLY QR NOERROR
SECTION QUESTION
net. IN A
SECTION AUTHORITY
net. IN NS e.gtld-servers.net.
SECTION ADDITIONAL
e.gtld-servers.net. IN A 192.12.94.30
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
ns.example.net. IN AAAA
SECTION AUTHORITY
net. IN NS e.gtld-servers.net.
SECTION ADDITIONAL
e.gtld-servers.net. IN A 192.12.94.30
ENTRY_END
RANGE_END
; a.gtld-servers.net.
RANGE_BEGIN 0 100
ADDRESS 192.5.6.30
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
com. IN NS
SECTION ANSWER
com. IN NS a.gtld-servers.net.
SECTION ADDITIONAL
a.gtld-servers.net. 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 A
SECTION AUTHORITY
example.com. IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.55
ENTRY_END
RANGE_END
; e.gtld-servers.net.
; Note this timing is so it will provide answers at the beginning.
RANGE_BEGIN 0 30
ADDRESS 192.12.94.30
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
net. IN NS
SECTION ANSWER
net. IN NS e.gtld-servers.net.
SECTION ADDITIONAL
e.gtld-servers.net. IN A 192.12.94.30
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
e.gtld-servers.net. IN AAAA
SECTION ANSWER
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
a.gtld-servers.net. IN AAAA
SECTION ANSWER
ENTRY_END
; no example.net delegation answers yet.
RANGE_END
; e.gtld-servers.net.
; Note this timing is so it will not provide answers at the beginning,
; but only later on.
RANGE_BEGIN 30 100
ADDRESS 192.12.94.30
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
net. IN NS
SECTION ANSWER
net. IN NS e.gtld-servers.net.
SECTION ADDITIONAL
e.gtld-servers.net. IN A 192.12.94.30
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
e.gtld-servers.net. IN AAAA
SECTION ANSWER
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
a.gtld-servers.net. IN AAAA
SECTION ANSWER
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
ns.example.net. IN A
SECTION AUTHORITY
example.net. IN NS ns.example.net.
SECTION ADDITIONAL
ns.example.net. IN A 1.2.3.44
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
ns.example.net. IN AAAA
SECTION AUTHORITY
example.net. IN NS ns.example.net.
SECTION ADDITIONAL
ns.example.net. IN A 1.2.3.44
ENTRY_END
RANGE_END
; ns.example.net.
; Note this timing is so it will not provide answers at the beginning,
; but only later on.
RANGE_BEGIN 30 100
ADDRESS 1.2.3.44
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.net. IN NS
SECTION ANSWER
example.net. IN NS ns.example.net.
SECTION ADDITIONAL
ns.example.net. IN A 1.2.3.44
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example.net. IN A
SECTION ANSWER
ns.example.net. IN A 1.2.3.44
SECTION AUTHORITY
example.net. IN NS ns.example.net.
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example.net. IN AAAA
SECTION AUTHORITY
example.net. IN NS ns.example.net.
SECTION ADDITIONAL
ns.example.net. IN A 1.2.3.44
ENTRY_END
; response to DNSKEY priming query
; sub.example.com. 3600 IN DS 30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
sub.example.com. IN DNSKEY
SECTION ANSWER
sub.example.com. 3600 IN DNSKEY 256 3 5 AQPQ41chR9DEHt/aIzIFAqanbDlRflJoRs5yz1jFsoRIT7dWf0r+PeDuewdxkszNH6wnU4QL8pfKFRh5PIYVBLK3 ;{id = 30899 (zsk), size = 512b}
sub.example.com. 3600 IN RRSIG DNSKEY 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. uNGp99iznjD7oOX02XnQbDnbg75UwBHRvZSKYUorTKvPUnCWMHKdRsQ+mf+Fx3GZ+Fz9BVjoCmQqpnfgXLEYqw== ;{id = 30899}
SECTION AUTHORITY
; no NS set. not needed for this test.
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ns.sub.example.com. 3600 IN RRSIG A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. UF7shD/gt1FOp2UHgLTNbPzVykklSXFMEtJ1xD+Hholwf/PIzd7zoaIttIYibNa4fUXCqMg22H9P7MRhfmFe6g== ;{id = 30899}
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
sub.example.com. IN NS
SECTION ANSWER
sub.example.com. IN NS ns.sub.example.com.
sub.example.com. IN NS ns.example.net.
sub.example.com. 3600 IN RRSIG NS 5 3 3600 20070926134150 20070829134150 30899 sub.example.com. C/0b+sqlsdSTkhd+aDXb6ELyuQreosIGBzLCtWxYGD+Q9QGB5rN8uB+4+48yhw36pd3MfeAn06AgAnJ6eu8tJg== ;{id = 30899}
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ns.sub.example.com. 3600 IN RRSIG A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. UF7shD/gt1FOp2UHgLTNbPzVykklSXFMEtJ1xD+Hholwf/PIzd7zoaIttIYibNa4fUXCqMg22H9P7MRhfmFe6g== ;{id = 30899}
ENTRY_END
; response to query of interest
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION ANSWER
www.sub.example.com. IN A 11.11.11.11
www.sub.example.com. 3600 IN RRSIG A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. 0DqqRfRtm7VSEQ4mmBbzrKRqQAay3JAE8DPDGmjtokrrjN9F1G/HxozDV7bjdIh2EChlQea8FPwf/GepJMUVxg== ;{id = 30899}
SECTION AUTHORITY
SECTION ADDITIONAL
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.sub.example.com. IN AAAA
SECTION ANSWER
ENTRY_END
RANGE_END
; ns.example.com.
RANGE_BEGIN 0 100
ADDRESS 1.2.3.55
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.55
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 1.2.3.55
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.example.com. IN AAAA
ENTRY_END
; fine DNSKEY response.
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
example.com. IN DNSKEY
SECTION ANSWER
example.com. 3600 IN DNSKEY 256 3 3 ALXLUsWqUrY3JYER3T4TBJII s70j+sDS/UT2QRp61SE7S3E EXopNXoFE73JLRmvpi/UrOO/Vz4Se 6wXv/CYCKjGw06U4WRgR YXcpEhJROyNapmdIKSx hOzfLVE1gqA0PweZR8d tY3aNQSRn3sPpwJr6Mi /PqQKAMMrZ9ckJpf1+b QMOOvxgzz2U1GS18b3y ZKcgTMEaJzd/GZYzi/B N2DzQ0MsrSwYXfsNLFO Bbs8PJMW4LYIxeeOe6rUgkWOF 7CC9Dh/dduQ1QrsJhmZAEFfd6ByYV+ ;{id = 2854 (zsk), size = 1688b}
example.com. 3600 IN RRSIG DNSKEY DSA 2 3600 20070926134150 20070829134150 2854 example.com. MCwCFBQRtlR4BEv9ohi+PGFjp+AHsJuHAhRCvz0shggvnvI88DFnBDCczHUcVA== ;{id = 2854}
SECTION AUTHORITY
example.com. IN NS ns.example.com.
example.com. 3600 IN RRSIG NS 3 2 3600 20070926134150 20070829134150 2854 example.com. MC0CFQCN+qHdJxoI/2tNKwsb08pra/G7aAIUAWA5sDdJTbrXA1/3OaesGBAO3sI= ;{id = 2854}
ENTRY_END
; correct delegation with DS
ENTRY_BEGIN
MATCH opcode subdomain
ADJUST copy_id copy_query
REPLY QR AA NOERROR
SECTION QUESTION
sub.example.com. IN A
SECTION ANSWER
SECTION AUTHORITY
sub.example.com. IN NS ns.sub.example.com.
sub.example.com. IN NS ns.example.net.
sub.example.com. 3600 IN DS 30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
sub.example.com. 3600 IN RRSIG DS 3 3 3600 20070926134150 20070829134150 2854 example.com. MCwCFCW3ix0GD4BSvNLWIbROCJt5DAW9AhRt/kg9kBKJ20UBUdumrBUHqnskdA== ;{id = 2854}
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ENTRY_END
; response for delegation to sub.example.com.
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
sub.example.com. IN DNSKEY
SECTION ANSWER
SECTION AUTHORITY
sub.example.com. IN NS ns.sub.example.com.
sub.example.com. IN NS ns.example.net.
sub.example.com. 3600 IN DS 30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
sub.example.com. 3600 IN RRSIG DS 3 3 3600 20070926134150 20070829134150 2854 example.com. MCwCFCW3ix0GD4BSvNLWIbROCJt5DAW9AhRt/kg9kBKJ20UBUdumrBUHqnskdA== ;{id = 2854}
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ENTRY_END
RANGE_END
; This server is DNSSEC LAME!
; ns.sub.example.com.
RANGE_BEGIN 0 100
ADDRESS 1.2.3.6
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
sub.example.com. IN NS
SECTION ANSWER
sub.example.com. IN NS ns.sub.example.com.
sub.example.com. IN NS ns.example.net.
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ENTRY_END
; response to DNSKEY priming query
; sub.example.com. 3600 IN DS 30899 RSASHA1 1 f7ed618f24d5e5202927e1d27bc2e84a141cb4b3
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
sub.example.com. IN DNSKEY
SECTION ANSWER
sub.example.com. 3600 IN DNSKEY 256 3 5 AQPQ41chR9DEHt/aIzIFAqanbDlRflJoRs5yz1jFsoRIT7dWf0r+PeDuewdxkszNH6wnU4QL8pfKFRh5PIYVBLK3 ;{id = 30899 (zsk), size = 512b}
SECTION AUTHORITY
sub.example.com. IN NS ns.sub.example.com.
sub.example.com. IN NS ns.example.net.
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
ns.sub.example.com. IN AAAA
SECTION ANSWER
ENTRY_END
; response to query of interest
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR AA NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION ANSWER
www.sub.example.com. IN A 11.11.11.11
SECTION AUTHORITY
; dnssec-lameness detection depends on this information
sub.example.com. IN NS ns.sub.example.com.
sub.example.com. IN NS ns.example.net.
SECTION ADDITIONAL
ns.sub.example.com. IN A 1.2.3.6
ENTRY_END
RANGE_END
STEP 1 QUERY
ENTRY_BEGIN
REPLY RD DO
SECTION QUESTION
www.sub.example.com. IN A
ENTRY_END
STEP 10 NOTHING
; recursion at time 10.
; first recursion with answers in 0-30 time
; with bug it now resolves to the bad version
; fixed, it stops waiting for more target queries.
STEP 40 NOTHING
; next recursion with more answers at time 40.
; recursion happens here.
STEP 50 CHECK_ANSWER
ENTRY_BEGIN
MATCH all
REPLY QR RD RA AD DO NOERROR
SECTION QUESTION
www.sub.example.com. IN A
SECTION ANSWER
www.sub.example.com. IN A 11.11.11.11
www.sub.example.com. 3600 IN RRSIG A 5 4 3600 20070926134150 20070829134150 30899 sub.example.com. 0DqqRfRtm7VSEQ4mmBbzrKRqQAay3JAE8DPDGmjtokrrjN9F1G/HxozDV7bjdIh2EChlQea8FPwf/GepJMUVxg== ;{id = 30899}
ENTRY_END
SCENARIO_END