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-rw-r--r--source4/dns_server/dns_query.c61
-rw-r--r--source4/scripting/python/samba/tests/dns.py76
2 files changed, 132 insertions, 5 deletions
diff --git a/source4/dns_server/dns_query.c b/source4/dns_server/dns_query.c
index 0e63058228..40df3a1ff0 100644
--- a/source4/dns_server/dns_query.c
+++ b/source4/dns_server/dns_query.c
@@ -231,11 +231,11 @@ static WERROR handle_question(struct dns_server *dns,
const struct dns_name_question *question,
struct dns_res_rec **answers, uint16_t *ancount)
{
- struct dns_res_rec *ans;
+ struct dns_res_rec *ans = *answers;
WERROR werror;
unsigned int ri;
struct dnsp_DnssrvRpcRecord *recs;
- uint16_t rec_count, ai = 0;
+ uint16_t rec_count, ai = *ancount;
struct ldb_dn *dn = NULL;
werror = dns_name2dn(dns, mem_ctx, question->name, &dn);
@@ -244,16 +244,67 @@ static WERROR handle_question(struct dns_server *dns,
werror = dns_lookup_records(dns, mem_ctx, dn, &recs, &rec_count);
W_ERROR_NOT_OK_RETURN(werror);
- ans = talloc_zero_array(mem_ctx, struct dns_res_rec, rec_count);
- W_ERROR_HAVE_NO_MEMORY(ans);
+ ans = talloc_realloc(mem_ctx, ans, struct dns_res_rec, rec_count + ai);
+ if (ans == NULL) {
+ return WERR_NOMEM;
+ }
for (ri = 0; ri < rec_count; ri++) {
+ if ((recs[ri].wType == DNS_TYPE_CNAME) &&
+ ((question->question_type == DNS_QTYPE_A) ||
+ (question->question_type == DNS_QTYPE_AAAA))) {
+ struct dns_name_question *new_q =
+ talloc(mem_ctx, struct dns_name_question);
+
+ if (new_q == NULL) {
+ return WERR_NOMEM;
+ }
+
+ /* We reply with one more record, so grow the array */
+ ans = talloc_realloc(mem_ctx, ans, struct dns_res_rec,
+ rec_count + 1);
+ if (ans == NULL) {
+ TALLOC_FREE(new_q);
+ return WERR_NOMEM;
+ }
+
+ /* First put in the CNAME record */
+ werror = create_response_rr(question, &recs[ri], &ans, &ai);
+ if (!W_ERROR_IS_OK(werror)) {
+ return werror;
+ }
+
+ /* And then look up the name it points at.. */
+
+ /* First build up the new question */
+ new_q->question_type = question->question_type;
+ new_q->question_class = question->question_class;
+ if (new_q->question_type == DNS_QTYPE_A) {
+ new_q->name = talloc_strdup(new_q, recs[ri].data.ipv4);
+ } else if (new_q->question_type == DNS_QTYPE_AAAA) {
+ new_q->name = talloc_strdup(new_q, recs[ri].data.ipv6);
+ }
+ if (new_q->name == NULL) {
+ TALLOC_FREE(new_q);
+ return WERR_NOMEM;
+ }
+ /* and then call the lookup again */
+ werror = handle_question(dns, mem_ctx, new_q, &ans, &ai);
+ if (!W_ERROR_IS_OK(werror)) {
+ return werror;
+ }
+
+
+ continue;
+ }
if ((question->question_type != DNS_QTYPE_ALL) &&
(recs[ri].wType != question->question_type)) {
continue;
}
werror = create_response_rr(question, &recs[ri], &ans, &ai);
- W_ERROR_NOT_OK_RETURN(werror);
+ if (!W_ERROR_IS_OK(werror)) {
+ return werror;
+ }
}
if (ai == 0) {
diff --git a/source4/scripting/python/samba/tests/dns.py b/source4/scripting/python/samba/tests/dns.py
index a032f23a50..aa6a4e6028 100644
--- a/source4/scripting/python/samba/tests/dns.py
+++ b/source4/scripting/python/samba/tests/dns.py
@@ -469,6 +469,82 @@ class TestDNSUpdates(DNSTest):
self.assert_dns_rcode_equals(response, dns.DNS_RCODE_NXDOMAIN)
+class TestComplexQueries(DNSTest):
+ def setUp(self):
+ super(TestComplexQueries, self).setUp()
+ p = self.make_name_packet(dns.DNS_OPCODE_UPDATE)
+ updates = []
+
+ name = self.get_dns_domain()
+
+ u = self.make_name_question(name, dns.DNS_QTYPE_SOA, dns.DNS_QCLASS_IN)
+ updates.append(u)
+ self.finish_name_packet(p, updates)
+
+ updates = []
+ r = dns.res_rec()
+ r.name = "cname_test.%s" % self.get_dns_domain()
+ r.rr_type = dns.DNS_QTYPE_CNAME
+ r.rr_class = dns.DNS_QCLASS_IN
+ r.ttl = 900
+ r.length = 0xffff
+ r.rdata = "%s.%s" % (os.getenv('DC_SERVER'), self.get_dns_domain())
+ updates.append(r)
+ p.nscount = len(updates)
+ p.nsrecs = updates
+
+ response = self.dns_transaction_udp(p)
+ self.assert_dns_rcode_equals(response, dns.DNS_RCODE_OK)
+
+ def tearDown(self):
+ super(TestComplexQueries, self).tearDown()
+ p = self.make_name_packet(dns.DNS_OPCODE_UPDATE)
+ updates = []
+
+ name = self.get_dns_domain()
+
+ u = self.make_name_question(name, dns.DNS_QTYPE_SOA, dns.DNS_QCLASS_IN)
+ updates.append(u)
+ self.finish_name_packet(p, updates)
+
+ updates = []
+ r = dns.res_rec()
+ r.name = "cname_test.%s" % self.get_dns_domain()
+ r.rr_type = dns.DNS_QTYPE_CNAME
+ r.rr_class = dns.DNS_QCLASS_NONE
+ r.ttl = 0
+ r.length = 0xffff
+ r.rdata = "%s.%s" % (os.getenv('DC_SERVER'), self.get_dns_domain())
+ updates.append(r)
+ p.nscount = len(updates)
+ p.nsrecs = updates
+
+ response = self.dns_transaction_udp(p)
+ self.assert_dns_rcode_equals(response, dns.DNS_RCODE_OK)
+
+ def test_one_a_query(self):
+ "create a query packet containing one query record"
+ p = self.make_name_packet(dns.DNS_OPCODE_QUERY)
+ questions = []
+
+ name = "cname_test.%s" % self.get_dns_domain()
+ q = self.make_name_question(name, dns.DNS_QTYPE_A, dns.DNS_QCLASS_IN)
+ print "asking for ", q.name
+ questions.append(q)
+
+ self.finish_name_packet(p, questions)
+ response = self.dns_transaction_udp(p)
+ self.assert_dns_rcode_equals(response, dns.DNS_RCODE_OK)
+ self.assert_dns_opcode_equals(response, dns.DNS_OPCODE_QUERY)
+ self.assertEquals(response.ancount, 2)
+ self.assertEquals(response.answers[0].rr_type, dns.DNS_QTYPE_CNAME)
+ self.assertEquals(response.answers[0].rdata, "%s.%s" %
+ (os.getenv('DC_SERVER'), self.get_dns_domain()))
+ self.assertEquals(response.answers[1].rr_type, dns.DNS_QTYPE_A)
+ self.assertEquals(response.answers[1].rdata,
+ os.getenv('DC_SERVER_IP'))
+
+
if __name__ == "__main__":
import unittest
unittest.main()
generated by cgit (git 2.34.1) at 2024-06-23 19:50:23 +0000