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Added new static zone type block_a to suppress all A queries for specific zones #819

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Jan 20, 2023
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Added new static zone type block_a to suppress all A queries for specific zones #819

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2 changes: 2 additions & 0 deletions doc/example.conf.in
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Original file line number Diff line number Diff line change
Expand Up @@ -810,6 +810,8 @@ server:
# o always_transparent, always_refuse, always_nxdomain, always_nodata,
# always_deny resolve in that way but ignore local data for
# that name
# o block_a resolves all records normally but returns
# NODATA for A queries and ignores local data for that name
# o always_null returns 0.0.0.0 or ::0 for any name in the zone.
# o noview breaks out of that view towards global local-zones.
#
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14 changes: 10 additions & 4 deletions doc/unbound.conf.5.in
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Expand Up @@ -1391,10 +1391,10 @@ address space are not validated. This is usually required whenever
Configure a local zone. The type determines the answer to give if
there is no match from local\-data. The types are deny, refuse, static,
transparent, redirect, nodefault, typetransparent, inform, inform_deny,
inform_redirect, always_transparent, always_refuse, always_nxdomain, always_null, noview,
and are explained below. After that the default settings are listed. Use
local\-data: to enter data into the local zone. Answers for local zones
are authoritative DNS answers. By default the zones are class IN.
inform_redirect, always_transparent, block_a, always_refuse, always_nxdomain,
always_null, noview, and are explained below. After that the default settings
are listed. Use local\-data: to enter data into the local zone. Answers for
local zones are authoritative DNS answers. By default the zones are class IN.
.IP
If you need more complicated authoritative data, with referrals, wildcards,
CNAME/DNAME support, or DNSSEC authoritative service, setup a stub\-zone for
Expand Down Expand Up @@ -1469,6 +1469,12 @@ Ie. answer queries with fixed data and also log the machines that ask.
\h'5'\fIalways_transparent\fR
Like transparent, but ignores local data and resolves normally.
.TP 10
\h'5'\fIblock_a\fR
Like transparent, but ignores local data and resolves normally all query
types excluding A. For A queries it unconditionally returns NODATA.
Useful in cases when there is a need to explicitly force all apps to use
IPv6 protocol and avoid any queries to IPv4.
.TP 10
\h'5'\fIalways_refuse\fR
Like refuse, but ignores local data and refuses the query.
.TP 10
Expand Down
19 changes: 17 additions & 2 deletions services/localzone.c
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Expand Up @@ -1603,7 +1603,7 @@ local_zone_does_not_cover(struct local_zone* z, struct query_info* qinfo,
struct local_data key;
struct local_data* ld = NULL;
struct local_rrset* lr = NULL;
if(z->type == local_zone_always_transparent)
if(z->type == local_zone_always_transparent || z->type == local_zone_block_a)
return 1;
if(z->type != local_zone_transparent
&& z->type != local_zone_typetransparent
Expand Down Expand Up @@ -1679,6 +1679,16 @@ local_zones_zone_answer(struct local_zone* z, struct module_env* env,
} else if(lz_type == local_zone_typetransparent
|| lz_type == local_zone_always_transparent) {
/* no NODATA or NXDOMAINS for this zone type */
return 0;
} else if(lz_type == local_zone_block_a) {
// Return NODATA for all A queries
if(qinfo->qtype == LDNS_RR_TYPE_A) {
local_error_encode(qinfo, env, edns, repinfo, buf, temp,
LDNS_RCODE_NOERROR, (LDNS_RCODE_NOERROR|BIT_AA),
LDNS_EDE_NONE, NULL);
return 1;
}

return 0;
} else if(lz_type == local_zone_always_null) {
/* 0.0.0.0 or ::0 or noerror/nodata for this zone type,
Expand Down Expand Up @@ -1846,7 +1856,8 @@ local_zones_answer(struct local_zones* zones, struct module_env* env,
if(z && (lzt == local_zone_transparent ||
lzt == local_zone_typetransparent ||
lzt == local_zone_inform ||
lzt == local_zone_always_transparent) &&
lzt == local_zone_always_transparent ||
lzt == local_zone_block_a) &&
local_zone_does_not_cover(z, qinfo, labs)) {
lock_rw_unlock(&z->lock);
z = NULL;
Expand Down Expand Up @@ -1894,6 +1905,7 @@ local_zones_answer(struct local_zones* zones, struct module_env* env,

if(lzt != local_zone_always_refuse
&& lzt != local_zone_always_transparent
&& lzt != local_zone_block_a
&& lzt != local_zone_always_nxdomain
&& lzt != local_zone_always_nodata
&& lzt != local_zone_always_deny
Expand Down Expand Up @@ -1924,6 +1936,7 @@ const char* local_zone_type2str(enum localzone_type t)
case local_zone_inform_deny: return "inform_deny";
case local_zone_inform_redirect: return "inform_redirect";
case local_zone_always_transparent: return "always_transparent";
case local_zone_block_a: return "block_a";
case local_zone_always_refuse: return "always_refuse";
case local_zone_always_nxdomain: return "always_nxdomain";
case local_zone_always_nodata: return "always_nodata";
Expand Down Expand Up @@ -1958,6 +1971,8 @@ int local_zone_str2type(const char* type, enum localzone_type* t)
*t = local_zone_inform_redirect;
else if(strcmp(type, "always_transparent") == 0)
*t = local_zone_always_transparent;
else if(strcmp(type, "block_a") == 0)
*t = local_zone_block_a;
else if(strcmp(type, "always_refuse") == 0)
*t = local_zone_always_refuse;
else if(strcmp(type, "always_nxdomain") == 0)
Expand Down
2 changes: 2 additions & 0 deletions services/localzone.h
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Original file line number Diff line number Diff line change
Expand Up @@ -88,6 +88,8 @@ enum localzone_type {
local_zone_inform_redirect,
/** resolve normally, even when there is local data */
local_zone_always_transparent,
/** resolve normally, even when there is local data but return NODATA for A queries */
local_zone_block_a,
/** answer with error, even when there is local data */
local_zone_always_refuse,
/** answer with nxdomain, even when there is local data */
Expand Down
3 changes: 2 additions & 1 deletion util/configparser.y
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Expand Up @@ -2206,6 +2206,7 @@ server_local_zone: VAR_LOCAL_ZONE STRING_ARG STRING_ARG
strcmp($3, "transparent")!=0 && strcmp($3, "nodefault")!=0
&& strcmp($3, "typetransparent")!=0
&& strcmp($3, "always_transparent")!=0
&& strcmp($3, "block_a")!=0
&& strcmp($3, "always_refuse")!=0
&& strcmp($3, "always_nxdomain")!=0
&& strcmp($3, "always_nodata")!=0
Expand All @@ -2218,7 +2219,7 @@ server_local_zone: VAR_LOCAL_ZONE STRING_ARG STRING_ARG
yyerror("local-zone type: expected static, deny, "
"refuse, redirect, transparent, "
"typetransparent, inform, inform_deny, "
"inform_redirect, always_transparent, "
"inform_redirect, always_transparent, block_a,"
"always_refuse, always_nxdomain, "
"always_nodata, always_deny, always_null, "
"noview, nodefault or ipset");
Expand Down