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Recursion lame is detected and last resort is used to resolve.

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git-svn-id: file:///svn/unbound/trunk@1294 be551aaa-1e26-0410-a405-d3ace91eadb9
This commit is contained in:
Wouter Wijngaards 2008-10-13 09:11:42 +00:00
parent 5b7a514119
commit dbaa5194a6
13 changed files with 424 additions and 40 deletions
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5
doc/Changelog
View file

@ -1,3 +1,8 @@
13 October 2008: Wouter
- fixed recursion servers deployed as authoritative detection, so
that as a last resort, a +RD query is sent there to get the
correct answer.
10 October 2008: Wouter
- fixup tests - the negative cache contained the correct NSEC3s for
two tests that are supposed to fail to validate.

10
iterator/iter_resptype.c
View file

@ -116,7 +116,7 @@ response_type_from_server(int rdset,
/* make sure its not recursive when we don't want it to */
if( (msg->rep->flags&BIT_RA) &&
!(msg->rep->flags&BIT_AA) && !rdset)
return RESPONSE_TYPE_LAME;
return RESPONSE_TYPE_REC_LAME;
return RESPONSE_TYPE_ANSWER;
}
@ -200,7 +200,7 @@ response_type_from_server(int rdset,
/* we do our own recursion, thank you */
if( (msg->rep->flags&BIT_RA) &&
!(msg->rep->flags&BIT_AA) && !rdset)
return RESPONSE_TYPE_LAME;
return RESPONSE_TYPE_REC_LAME;
return RESPONSE_TYPE_ANSWER;
}
}
@ -222,13 +222,13 @@ response_type_from_server(int rdset,
* deployed and is responding nonAA */
if( (msg->rep->flags&BIT_RA) &&
!(msg->rep->flags&BIT_AA) && !rdset)
return RESPONSE_TYPE_LAME;
return RESPONSE_TYPE_REC_LAME;
/* Or if a lame server is deployed,
* which gives ns==zone delegation from cache
* without AA bit as well, with nodata nosoa*/
if(msg->rep->an_numrrsets==0 &&
!(msg->rep->flags&BIT_AA) && !rdset)
return RESPONSE_TYPE_LAME;
return RESPONSE_TYPE_REC_LAME;
return RESPONSE_TYPE_ANSWER;
}
/* If we are getting a referral upwards (or to
@ -259,6 +259,6 @@ response_type_from_server(int rdset,
* be an entirely empty message) */
/* check if recursive answer; saying it has empty cache */
if( (msg->rep->flags&BIT_RA) && !(msg->rep->flags&BIT_AA) && !rdset)
return RESPONSE_TYPE_LAME;
return RESPONSE_TYPE_REC_LAME;
return RESPONSE_TYPE_ANSWER;
}

9
iterator/iter_resptype.h
View file

@ -81,7 +81,14 @@ enum response_type {
* 'lame' means that this particular response indicates that
* the nameserver knew nothing about the question.
*/
RESPONSE_TYPE_LAME
RESPONSE_TYPE_LAME,
/**
* Recursion lame means that the nameserver is some sort of
* open recursor, and not authoritative for the question.
* It may know something, but not authoritatively.
*/
RESPONSE_TYPE_REC_LAME
};
/**

18
iterator/iter_utils.c
View file

@ -140,9 +140,7 @@ iter_filter_unsuitable(struct iter_env* iter_env, struct module_env* env,
uint8_t* name, size_t namelen, uint16_t qtype, uint32_t now,
struct delegpt_addr* a)
{
int rtt;
int lame;
int dnsseclame;
int rtt, lame, reclame, dnsseclame;
if(donotq_lookup(iter_env->donotq, &a->addr, a->addrlen)) {
return -1; /* server is on the donotquery list */
}
@ -151,11 +149,14 @@ iter_filter_unsuitable(struct iter_env* iter_env, struct module_env* env,
}
/* check lameness - need zone , class info */
if(infra_get_lame_rtt(env->infra_cache, &a->addr, a->addrlen,
name, namelen, qtype, &lame, &dnsseclame, &rtt, now)) {
name, namelen, qtype, &lame, &dnsseclame, &reclame,
&rtt, now)) {
if(lame)
return -1; /* server is lame */
else if(rtt >= USEFUL_SERVER_TOP_TIMEOUT)
return -1; /* server is unresponsive */
else if(reclame)
return rtt+USEFUL_SERVER_TOP_TIMEOUT*2; /* nonpref */
else if(dnsseclame )
return rtt+USEFUL_SERVER_TOP_TIMEOUT; /* nonpref */
else return rtt;
@ -240,7 +241,8 @@ iter_filter_order(struct iter_env* iter_env, struct module_env* env,
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)
uint8_t* name, size_t namelen, uint16_t qtype, int* dnssec_expected,
int* chase_to_rd)
{
int sel;
int selrtt;
@ -250,8 +252,12 @@ iter_server_selection(struct iter_env* iter_env,
if(num == 0)
return NULL;
if(selrtt >= USEFUL_SERVER_TOP_TIMEOUT)
if(selrtt >= USEFUL_SERVER_TOP_TIMEOUT*2) {
*chase_to_rd = 1;
}
if(selrtt >= USEFUL_SERVER_TOP_TIMEOUT) {
*dnssec_expected = 0;
}
if(num == 1) {
a = dp->result_list;
if(++a->attempts < OUTBOUND_MSG_RETRY)

5
iterator/iter_utils.h
View file

@ -77,12 +77,15 @@ int iter_apply_cfg(struct iter_env* iter_env, struct config_file* cfg);
* @param qtype: query type that we want to send.
* @param dnssec_expected: set to 0, if a known dnssec-lame server is selected
* 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.
* @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);
size_t namelen, uint16_t qtype, int* dnssec_expected,
int* chase_to_rd);
/**
* Allocate dns_msg from parsed msg, in regional.

25
iterator/iterator.c
View file

@ -1211,7 +1211,7 @@ 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->dnssec_expected, &iq->chase_to_rd);
/* If no usable target was selected... */
if(!target) {
@ -1276,7 +1276,7 @@ processQueryTargets(struct module_qstate* qstate, struct iter_qstate* iq,
outq = (*qstate->env->send_query)(
iq->qchase.qname, iq->qchase.qname_len,
iq->qchase.qtype, iq->qchase.qclass,
iq->chase_flags, EDNS_DO|BIT_CD,
iq->chase_flags | (iq->chase_to_rd?BIT_RD:0), EDNS_DO|BIT_CD,
&target->addr, target->addrlen, qstate);
if(!outq) {
verbose(VERB_OPS, "error sending query to auth server; "
@ -1313,11 +1313,14 @@ processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
enum response_type type;
iq->num_current_queries--;
if(iq->response == NULL) {
iq->chase_to_rd = 0;
verbose(VERB_ALGO, "query response was timeout");
return next_state(iq, QUERYTARGETS_STATE);
}
type = response_type_from_server((int)(iq->chase_flags&BIT_RD),
type = response_type_from_server(
(int)((iq->chase_flags&BIT_RD) || iq->chase_to_rd),
iq->response, &iq->qchase, iq->dp);
iq->chase_to_rd = 0;
if(type == RESPONSE_TYPE_REFERRAL && (iq->chase_flags&BIT_RD)) {
/* When forwarding (RD bit is set), we handle referrals
* differently. No queries should be sent elsewhere */
@ -1325,6 +1328,7 @@ processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
}
if(iq->dnssec_expected && !(iq->chase_flags&BIT_RD)
&& type != RESPONSE_TYPE_LAME
&& type != RESPONSE_TYPE_REC_LAME
&& type != RESPONSE_TYPE_THROWAWAY
&& type != RESPONSE_TYPE_UNTYPED) {
/* a possible answer, see if it is missing DNSSEC */
@ -1458,11 +1462,24 @@ processQueryResponse(struct module_qstate* qstate, struct iter_qstate* iq,
if(!infra_set_lame(qstate->env->infra_cache,
&qstate->reply->addr, qstate->reply->addrlen,
iq->dp->name, iq->dp->namelen,
*qstate->env->now, dnsseclame,
*qstate->env->now, dnsseclame, 0,
iq->qchase.qtype))
log_err("mark host lame: out of memory");
} else log_err("%slame response from cache",
dnsseclame?"DNSSEC ":"");
} else if(type == RESPONSE_TYPE_REC_LAME) {
/* Cache the LAMEness. */
verbose(VERB_DETAIL, "query response REC_LAME: "
"recursive but not authoritative server");
if(qstate->reply) {
/* need addr for lameness cache, but we may have
* gotten this from cache, so test to be sure */
if(!infra_set_lame(qstate->env->infra_cache,
&qstate->reply->addr, qstate->reply->addrlen,
iq->dp->name, iq->dp->namelen,
*qstate->env->now, 0, 1, iq->qchase.qtype))
log_err("mark host lame: out of memory");
}
} else if(type == RESPONSE_TYPE_THROWAWAY) {
/* LAME and THROWAWAY responses are handled the same way.
* In this case, the event is just sent directly back to

2
iterator/iterator.h
View file

@ -210,6 +210,8 @@ struct iter_qstate {
struct query_info qchase;
/** query flags to use when chasing the answer (i.e. RD flag) */
uint16_t chase_flags;
/** true if we set RD bit because of last resort recursion lame query*/
int chase_to_rd;
/**
* This is the current delegation point for an in-progress query. This

34
services/cache/infra.c vendored
View file

@ -266,7 +266,7 @@ hash_lameness(uint8_t* name, size_t namelen)
int
infra_lookup_lame(struct infra_host_data* host,
uint8_t* name, size_t namelen, uint32_t timenow,
int* dlame, int* alame, int* olame)
int* dlame, int* rlame, int* alame, int* olame)
{
struct lruhash_entry* e;
struct infra_lame_key k;
@ -287,10 +287,11 @@ infra_lookup_lame(struct infra_host_data* host,
return 0;
}
*dlame = d->isdnsseclame;
*rlame = d->rec_lame;
*alame = d->lame_type_A;
*olame = d->lame_other;
lock_rw_unlock(&e->lock);
return *dlame || *alame || *olame;
return *dlame || *rlame || *alame || *olame;
}
size_t
@ -337,7 +338,7 @@ int
infra_set_lame(struct infra_cache* infra,
struct sockaddr_storage* addr, socklen_t addrlen,
uint8_t* name, size_t namelen, uint32_t timenow, int dnsseclame,
uint16_t qtype)
int reclame, uint16_t qtype)
{
struct infra_host_data* data;
struct lruhash_entry* e;
@ -369,8 +370,9 @@ infra_set_lame(struct infra_cache* infra,
k->entry.data = (void*)d;
d->ttl = timenow + infra->lame_ttl;
d->isdnsseclame = dnsseclame;
d->lame_type_A = (!dnsseclame && qtype == LDNS_RR_TYPE_A);
d->lame_other = (!dnsseclame && qtype != LDNS_RR_TYPE_A);
d->rec_lame = reclame;
d->lame_type_A = (!dnsseclame && !reclame && qtype == LDNS_RR_TYPE_A);
d->lame_other = (!dnsseclame && !reclame && qtype != LDNS_RR_TYPE_A);
k->namelen = namelen;
e = infra_lookup_host_nottl(infra, addr, addrlen, 1);
if(!e) {
@ -404,11 +406,12 @@ infra_set_lame(struct infra_cache* infra,
}
} else {
/* lookup existing lameness entry (if any) and merge data */
int dlame, alame, olame;
int dlame, rlame, alame, olame;
if(infra_lookup_lame(data, name, namelen, timenow,
&dlame, &alame, &olame)) {
&dlame, &rlame, &alame, &olame)) {
/* merge data into new structure */
if(dlame) d->isdnsseclame = 1;
if(rlame) d->rec_lame = 1;
if(alame) d->lame_type_A = 1;
if(olame) d->lame_other = 1;
}
@ -500,38 +503,49 @@ int
infra_get_lame_rtt(struct infra_cache* infra,
struct sockaddr_storage* addr, socklen_t addrlen,
uint8_t* name, size_t namelen, uint16_t qtype,
int* lame, int* dnsseclame, int* rtt, uint32_t timenow)
int* lame, int* dnsseclame, int* reclame, int* rtt, uint32_t timenow)
{
struct infra_host_data* host;
struct lruhash_entry* e = infra_lookup_host_nottl(infra, addr,
addrlen, 0);
int dlm, alm, olm;
int dlm, rlm, alm, olm;
if(!e)
return 0;
host = (struct infra_host_data*)e->data;
*rtt = rtt_unclamped(&host->rtt);
/* check lameness first, if so, ttl on host does not matter anymore */
if(infra_lookup_lame(host, name, namelen, timenow, &dlm, &alm, &olm)) {
if(infra_lookup_lame(host, name, namelen, timenow,
&dlm, &rlm, &alm, &olm)) {
if(alm && qtype == LDNS_RR_TYPE_A) {
lock_rw_unlock(&e->lock);
*lame = 1;
*dnsseclame = 0;
*reclame = 0;
return 1;
} else if(olm && qtype != LDNS_RR_TYPE_A) {
lock_rw_unlock(&e->lock);
*lame = 1;
*dnsseclame = 0;
*reclame = 0;
return 1;
} else if(dlm) {
lock_rw_unlock(&e->lock);
*lame = 0;
*dnsseclame = 1;
*reclame = 0;
return 1;
} else if(rlm) {
lock_rw_unlock(&e->lock);
*lame = 0;
*dnsseclame = 0;
*reclame = 1;
return 1;
}
/* no lameness for this type of query */
}
*lame = 0;
*dnsseclame = 0;
*reclame = 0;
if(timenow > host->ttl) {
lock_rw_unlock(&e->lock);
return 0;

12
services/cache/infra.h vendored
View file

@ -98,6 +98,8 @@ struct infra_lame_data {
/** is the host lame (does not serve the zone authoritatively),
* or is the host dnssec lame (does not serve DNSSEC data) */
int isdnsseclame;
/** is the host recursion lame (not AA, but RA) */
int rec_lame;
/** the host is lame (not authoritative) for A records */
int lame_type_A;
/** the host is lame (not authoritative) for other query types */
@ -187,13 +189,14 @@ int infra_host(struct infra_cache* infra, struct sockaddr_storage* addr,
* @param namelen: length of domain name.
* @param timenow: what time it is now.
* @param dlame: if the function returns true, is set true if dnssec lame.
* @param rlame: if the function returns true, is set true if recursion lame.
* @param alame: if the function returns true, is set true if qtype A lame.
* @param olame: if the function returns true, is set true if qtype other lame.
* @return: 0 if not lame or unknown or timed out, 1 if lame
*/
int infra_lookup_lame(struct infra_host_data* host,
uint8_t* name, size_t namelen, uint32_t timenow,
int* dlame, int* alame, int* olame);
int* dlame, int* rlame, int* alame, int* olame);
/**
* Set a host to be lame for the given zone.
@ -205,13 +208,15 @@ int infra_lookup_lame(struct infra_host_data* host,
* @param timenow: what time it is now.
* @param dnsseclame: if true the host is set dnssec lame.
* if false, the host is marked lame (not serving the zone).
* @param reclame: if true host is a recursor not AA server.
* if false, dnsseclame or marked lame.
* @param qtype: the query type for which it is lame.
* @return: 0 on error.
*/
int infra_set_lame(struct infra_cache* infra,
struct sockaddr_storage* addr, socklen_t addrlen,
uint8_t* name, size_t namelen, uint32_t timenow, int dnsseclame,
uint16_t qtype);
int reclame, uint16_t qtype);
/**
* Update rtt information for the host.
@ -262,6 +267,7 @@ int infra_edns_update(struct infra_cache* infra,
* @param lame: if function returns true, this returns lameness of the zone.
* @param dnsseclame: if function returns true, this returns if the zone
* is dnssec-lame.
* @param reclame: if function returns true, this is if it is recursion lame.
* @param rtt: if function returns true, this returns avg rtt of the server.
* The rtt value is unclamped and reflects recent timeouts.
* @param timenow: what time it is now.
@ -270,7 +276,7 @@ int infra_edns_update(struct infra_cache* infra,
int infra_get_lame_rtt(struct infra_cache* infra,
struct sockaddr_storage* addr, socklen_t addrlen,
uint8_t* name, size_t namelen, uint16_t qtype,
int* lame, int* dnsseclame, int* rtt, uint32_t timenow);
int* lame, int* dnsseclame, int* reclame, int* rtt, uint32_t timenow);
/**
* Get memory used by the infra cache.

1
services/outside_network.c
View file

@ -1688,3 +1688,4 @@ serviced_get_mem(struct serviced_query* sq)
}
return s;
}

18
testcode/unitmain.c
View file

@ -320,7 +320,7 @@ infra_test()
struct infra_host_key* k;
struct infra_host_data* d;
int init = 376;
int dlame, alame, olame;
int dlame, rlame, alame, olame;
slab = infra_create(cfg);
unit_assert( infra_host(slab, (struct sockaddr_storage*)&one,
@ -345,30 +345,30 @@ infra_test()
unit_assert( vs == 0 && to == init && edns_lame == 0 );
unit_assert( infra_set_lame(slab, (struct sockaddr_storage*)&one,
(socklen_t)sizeof(int), zone, zonelen, now, 0,
(socklen_t)sizeof(int), zone, zonelen, now, 0, 0,
LDNS_RR_TYPE_A) );
unit_assert( (d=infra_lookup_host(slab, (struct sockaddr_storage*)&one,
(socklen_t)sizeof(int), 0, now, &k)) );
unit_assert( d->ttl == now+cfg->host_ttl );
unit_assert( d->edns_version == 0 );
unit_assert( infra_lookup_lame(d, zone, zonelen, now,
&dlame, &alame, &olame) );
unit_assert(!dlame && alame && !olame);
&dlame, &rlame, &alame, &olame) );
unit_assert(!dlame && !rlame && alame && !olame);
unit_assert( !infra_lookup_lame(d, zone, zonelen,
now+cfg->lame_ttl+10, &dlame, &alame, &olame) );
now+cfg->lame_ttl+10, &dlame, &rlame, &alame, &olame) );
unit_assert( !infra_lookup_lame(d, (uint8_t*)"\000", 1, now,
&dlame, &alame, &olame) );
&dlame, &rlame, &alame, &olame) );
lock_rw_unlock(&k->entry.lock);
/* test merge of data */
unit_assert( infra_set_lame(slab, (struct sockaddr_storage*)&one,
(socklen_t)sizeof(int), zone, zonelen, now, 0,
(socklen_t)sizeof(int), zone, zonelen, now, 0, 0,
LDNS_RR_TYPE_AAAA) );
unit_assert( (d=infra_lookup_host(slab, (struct sockaddr_storage*)&one,
(socklen_t)sizeof(int), 0, now, &k)) );
unit_assert( infra_lookup_lame(d, zone, zonelen, now,
&dlame, &alame, &olame) );
unit_assert(!dlame && alame && olame);
&dlame, &rlame, &alame, &olame) );
unit_assert(!dlame && !rlame && alame && olame);
lock_rw_unlock(&k->entry.lock);
infra_delete(slab);

162
testdata/iter_reclame_one.rpl vendored Normal file
View file

@ -0,0 +1,162 @@
; config options
stub-zone:
name: "."
stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
CONFIG_END
SCENARIO_BEGIN Test iterative resolve with a recursion lame server.
; The scenario has a domain with two servers, one is lame the other doesn't
; so depending on the randomly chosen server that goes first, it may
; select the nonlame or the lame server first.
; 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 qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.example.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
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 qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.example.com. IN A
SECTION AUTHORITY
example.com. IN NS ns.example.com.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
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.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
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.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
ENTRY_END
RANGE_END
; lame.example.com.
RANGE_BEGIN 0 100
ADDRESS 1.2.3.5
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR RA NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR 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.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. 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
; recursion happens here.
STEP 10 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.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
ENTRY_END
SCENARIO_END

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; config options
stub-zone:
name: "."
stub-addr: 193.0.14.129 # K.ROOT-SERVERS.NET.
CONFIG_END
SCENARIO_BEGIN Test iterative resolve with two recursion lame servers.
; both servers are recursion lame. The iterator tries both servers,
; but they are both lame. Then it concludes that it only has reclame.
; 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 qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.example.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
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 qtype qname
ADJUST copy_id
REPLY QR NOERROR
SECTION QUESTION
www.example.com. IN A
SECTION AUTHORITY
example.com. IN NS ns.example.com.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
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 RA NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR 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.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
ENTRY_END
RANGE_END
; lame.example.com.
RANGE_BEGIN 0 100
ADDRESS 1.2.3.5
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR RA NOERROR
SECTION QUESTION
example.com. IN NS
SECTION ANSWER
example.com. IN NS ns.example.com.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
ENTRY_END
ENTRY_BEGIN
MATCH opcode qtype qname
ADJUST copy_id
REPLY QR 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.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. 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
; recursion happens here.
STEP 10 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.
example.com. IN NS lame.example.com.
SECTION ADDITIONAL
ns.example.com. IN A 1.2.3.4
lame.example.com. IN A 1.2.3.5
ENTRY_END
SCENARIO_END