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Generate PTR records for DNS64 mapped ipv4only.arpa reverses.

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Rather than generating CNAMES records pointing into IN-ADDR.ARPA,
generate PTR records directly as the names are known as per RFC 8880.
This commit is contained in:
Mark Andrews
2020-09-01 12:03:59 +10:00
parent cdfe660326
commit 5684c21bcf
2 changed files with 21 additions and 1 deletions
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12
bin/named/builtin.c
View File

@@ -296,6 +296,16 @@ dns64_cname(const dns_name_t *zone, const dns_name_t *name,
*/
return (ISC_R_NOTFOUND);
}
/*
* Reverse of 192.0.0.170 or 192.0.0.171 maps to ipv4only.arpa.
*/
if ((v[0] == 170 || v[0] == 171) && v[1] == 0 && v[2] == 0 &&
v[3] == 192) {
return (dns_sdb_putrdata(lookup, dns_rdatatype_ptr, 3600,
ipv4only, sizeof(ipv4only)));
}
return (dns_sdb_putrdata(lookup, dns_rdatatype_cname, 600, rdata,
(unsigned int)len));
}
@@ -455,7 +465,7 @@ static isc_result_t
do_ipv4reverse_lookup(dns_sdblookup_t *lookup) {
isc_result_t result;
result = dns_sdb_putrdata(lookup, dns_rdatatype_ptr, 0, ipv4only,
result = dns_sdb_putrdata(lookup, dns_rdatatype_ptr, 3600, ipv4only,
sizeof(ipv4only));
return (result);
}

10
bin/tests/system/dns64/tests.sh
View File

@@ -1438,5 +1438,15 @@ n=`expr $n + 1`
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
echo_i "checking reverse of dns64 mapped ipv4only.arpa addresses returns ipv4only.arpa ($n)"
ret=0
$DIG $DIGOPTS ptr -x 2001:96::192.0.0.170 -b 10.53.0.7 @10.53.0.2 > dig.out.170.ns2.test$n || ret=1
$DIG $DIGOPTS ptr -x 2001:96::192.0.0.171 -b 10.53.0.7 @10.53.0.2 > dig.out.171.ns2.test$n || ret=1
grep "ip6\.arpa\..*PTR.*ipv4only\.arpa\." dig.out.170.ns2.test$n >/dev/null || ret=1
grep "ip6\.arpa\..*PTR.*ipv4only\.arpa\." dig.out.171.ns2.test$n >/dev/null || ret=1
n=`expr $n + 1`
if [ $ret != 0 ]; then echo_i "failed"; fi
status=`expr $status + $ret`
echo_i "exit status: $status"
[ $status -eq 0 ] || exit 1