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-rw-r--r--source4/dns_server/dns_server.c2
-rw-r--r--source4/dns_server/dns_server.h2
-rw-r--r--source4/dns_server/dns_update.c272
-rw-r--r--source4/scripting/python/samba/tests/dns.py79
4 files changed, 313 insertions, 42 deletions
diff --git a/source4/dns_server/dns_server.c b/source4/dns_server/dns_server.c
index 613bf9725c..25873c2bf4 100644
--- a/source4/dns_server/dns_server.c
+++ b/source4/dns_server/dns_server.c
@@ -147,7 +147,7 @@ static NTSTATUS dns_process(struct dns_server *dns,
break;
case DNS_OPCODE_UPDATE:
ret = dns_server_process_update(dns, out_packet, in_packet,
- answers, num_answers,
+ &answers, &num_answers,
&nsrecs, &num_nsrecs,
&additional, &num_additional);
break;
diff --git a/source4/dns_server/dns_server.h b/source4/dns_server/dns_server.h
index f1e9da5ffd..8570281baa 100644
--- a/source4/dns_server/dns_server.h
+++ b/source4/dns_server/dns_server.h
@@ -50,7 +50,7 @@ WERROR dns_server_process_query(struct dns_server *dns,
WERROR dns_server_process_update(struct dns_server *dns,
TALLOC_CTX *mem_ctx,
struct dns_name_packet *in,
- struct dns_res_rec *prereqs, uint16_t prereq_count,
+ struct dns_res_rec **prereqs, uint16_t *prereq_count,
struct dns_res_rec **updates, uint16_t *update_count,
struct dns_res_rec **additional, uint16_t *arcount);
diff --git a/source4/dns_server/dns_update.c b/source4/dns_server/dns_update.c
index 55589d227a..5b87e9f669 100644
--- a/source4/dns_server/dns_update.c
+++ b/source4/dns_server/dns_update.c
@@ -29,62 +29,185 @@
#include "dsdb/common/util.h"
#include "dns_server/dns_server.h"
-static WERROR check_prerequsites(struct dns_server *dns,
- TALLOC_CTX *mem_ctx,
- const struct dns_name_packet *in,
- const struct dns_res_rec *prereqs, uint16_t count)
+static WERROR dns_rr_to_dnsp(TALLOC_CTX *mem_ctx,
+ const struct dns_res_rec *rrec,
+ struct dnsp_DnssrvRpcRecord *r);
+
+static WERROR check_one_prerequisite(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
+ const struct dns_name_question *zone,
+ const struct dns_res_rec *pr,
+ bool *final_result)
{
- const struct dns_name_question *zone;
- size_t host_part_len = 0;
+ bool match;
+ WERROR werror;
+ struct ldb_dn *dn;
uint16_t i;
+ bool found = false;
+ struct dnsp_DnssrvRpcRecord *rec = NULL;
+ struct dnsp_DnssrvRpcRecord *ans;
+ uint16_t acount;
- zone = in->questions;
+ size_t host_part_len = 0;
- for (i = 0; i < count; i++) {
- const struct dns_res_rec *r = &prereqs[i];
- bool match;
+ *final_result = true;
+
+ if (pr->ttl != 0) {
+ return DNS_ERR(FORMAT_ERROR);
+ }
+
+ match = dns_name_match(zone->name, pr->name, &host_part_len);
+ if (!match) {
+ return DNS_ERR(NOTZONE);
+ }
- if (r->ttl != 0) {
+ werror = dns_name2dn(dns, mem_ctx, pr->name, &dn);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ if (pr->rr_class == DNS_QCLASS_ANY) {
+
+ if (pr->length != 0) {
return DNS_ERR(FORMAT_ERROR);
}
- match = dns_name_match(zone->name, r->name, &host_part_len);
- if (!match) {
- /* TODO: check if we need to echo all prereqs if the
- * first fails */
- return DNS_ERR(NOTZONE);
- }
- if (r->rr_class == DNS_QCLASS_ANY) {
- if (r->length != 0) {
- return DNS_ERR(FORMAT_ERROR);
- }
- if (r->rr_type == DNS_QTYPE_ALL) {
- /* TODO: Check if zone has at least one RR */
+
+
+ if (pr->rr_type == DNS_QTYPE_ALL) {
+ /*
+ */
+ werror = dns_lookup_records(dns, mem_ctx, dn, &ans, &acount);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ if (acount == 0) {
return DNS_ERR(NAME_ERROR);
- } else {
- /* TODO: Check if RR exists of the specified type */
+ }
+ } else {
+ /*
+ */
+ werror = dns_lookup_records(dns, mem_ctx, dn, &ans, &acount);
+ if (W_ERROR_EQUAL(werror, DNS_ERR(NAME_ERROR))) {
return DNS_ERR(NXRRSET);
}
- }
- if (r->rr_class == DNS_QCLASS_NONE) {
- if (r->length != 0) {
- return DNS_ERR(FORMAT_ERROR);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ for (i = 0; i < acount; i++) {
+ if (ans[i].wType == pr->rr_type) {
+ found = true;
+ break;
+ }
}
- if (r->rr_type == DNS_QTYPE_ALL) {
- /* TODO: Return this error if the given name exits in this zone */
+ if (!found) {
+ return DNS_ERR(NXRRSET);
+ }
+ }
+
+ /*
+ * RFC2136 3.2.5 doesn't actually mention the need to return
+ * OK here, but otherwise we'd always return a FORMAT_ERROR
+ * later on. This also matches Microsoft DNS behavior.
+ */
+ return WERR_OK;
+ }
+
+ if (pr->rr_class == DNS_QCLASS_NONE) {
+ if (pr->length != 0) {
+ return DNS_ERR(FORMAT_ERROR);
+ }
+
+ if (pr->rr_type == DNS_QTYPE_ALL) {
+ /*
+ */
+ werror = dns_lookup_records(dns, mem_ctx, dn, &ans, &acount);
+ if (W_ERROR_EQUAL(werror, WERR_OK)) {
return DNS_ERR(YXDOMAIN);
- } else {
- /* TODO: Return error if there's an RRset of this type in the zone */
+ }
+ } else {
+ /*
+ */
+ werror = dns_lookup_records(dns, mem_ctx, dn, &ans, &acount);
+ if (W_ERROR_EQUAL(werror, DNS_ERR(NAME_ERROR))) {
+ werror = WERR_OK;
+ ans = NULL;
+ acount = 0;
+ }
+
+ for (i = 0; i < acount; i++) {
+ if (ans[i].wType == pr->rr_type) {
+ found = true;
+ break;
+ }
+ }
+ if (found) {
return DNS_ERR(YXRRSET);
}
}
- if (r->rr_class == zone->question_class) {
- /* Check if there's a RR with this */
- return DNS_ERR(NOT_IMPLEMENTED);
- } else {
- return DNS_ERR(FORMAT_ERROR);
+
+ /*
+ * RFC2136 3.2.5 doesn't actually mention the need to return
+ * OK here, but otherwise we'd always return a FORMAT_ERROR
+ * later on. This also matches Microsoft DNS behavior.
+ */
+ return WERR_OK;
+ }
+
+ if (pr->rr_class != zone->question_class) {
+ return DNS_ERR(FORMAT_ERROR);
+ }
+
+ *final_result = false;
+
+ werror = dns_lookup_records(dns, mem_ctx, dn, &ans, &acount);
+ if (W_ERROR_EQUAL(werror, DNS_ERR(NAME_ERROR))) {
+ return DNS_ERR(NXRRSET);
+ }
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ rec = talloc_zero(mem_ctx, struct dnsp_DnssrvRpcRecord);
+ W_ERROR_HAVE_NO_MEMORY(rec);
+
+ werror = dns_rr_to_dnsp(rec, pr, rec);
+ W_ERROR_NOT_OK_RETURN(werror);
+
+ for (i = 0; i < acount; i++) {
+ if (dns_records_match(rec, &ans[i])) {
+ found = true;
+ break;
+ }
+ }
+
+ if (!found) {
+ return DNS_ERR(NXRRSET);
+ }
+
+ return WERR_OK;
+}
+
+static WERROR check_prerequisites(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
+ const struct dns_name_question *zone,
+ const struct dns_res_rec *prereqs, uint16_t count)
+{
+ uint16_t i;
+ WERROR final_error = WERR_OK;
+
+ for (i = 0; i < count; i++) {
+ bool final;
+ WERROR werror;
+
+ werror = check_one_prerequisite(dns, mem_ctx, zone,
+ &prereqs[i], &final);
+ if (!W_ERROR_IS_OK(werror)) {
+ if (final) {
+ return werror;
+ }
+ if (W_ERROR_IS_OK(final_error)) {
+ final_error = werror;
+ }
}
}
+ if (!W_ERROR_IS_OK(final_error)) {
+ return final_error;
+ }
return WERR_OK;
}
@@ -123,10 +246,76 @@ static WERROR update_prescan(const struct dns_name_question *zone,
return WERR_OK;
}
+static WERROR dns_rr_to_dnsp(TALLOC_CTX *mem_ctx,
+ const struct dns_res_rec *rrec,
+ struct dnsp_DnssrvRpcRecord *r)
+{
+ if (rrec->rr_type == DNS_QTYPE_ALL) {
+ return DNS_ERR(FORMAT_ERROR);
+ }
+
+ ZERO_STRUCTP(r);
+
+ r->wType = rrec->rr_type;
+ r->dwTtlSeconds = rrec->ttl;
+ r->rank = DNS_RANK_ZONE;
+ /* TODO: Autogenerate this somehow */
+ r->dwSerial = 110;
+
+ /* If we get QCLASS_ANY, we're done here */
+ if (rrec->rr_class == DNS_QCLASS_ANY) {
+ goto done;
+ }
+
+ switch(rrec->rr_type) {
+ case DNS_QTYPE_A:
+ r->data.ipv4 = talloc_strdup(mem_ctx, rrec->rdata.ipv4_record);
+ W_ERROR_HAVE_NO_MEMORY(r->data.ipv4);
+ break;
+ case DNS_QTYPE_AAAA:
+ r->data.ipv6 = talloc_strdup(mem_ctx, rrec->rdata.ipv6_record);
+ W_ERROR_HAVE_NO_MEMORY(r->data.ipv6);
+ break;
+ case DNS_QTYPE_NS:
+ r->data.ns = talloc_strdup(mem_ctx, rrec->rdata.ns_record);
+ W_ERROR_HAVE_NO_MEMORY(r->data.ns);
+ break;
+ case DNS_QTYPE_CNAME:
+ r->data.cname = talloc_strdup(mem_ctx, rrec->rdata.cname_record);
+ W_ERROR_HAVE_NO_MEMORY(r->data.cname);
+ break;
+ case DNS_QTYPE_SRV:
+ r->data.srv.wPriority = rrec->rdata.srv_record.priority;
+ r->data.srv.wWeight = rrec->rdata.srv_record.weight;
+ r->data.srv.wPort = rrec->rdata.srv_record.port;
+ r->data.srv.nameTarget = talloc_strdup(mem_ctx,
+ rrec->rdata.srv_record.target);
+ W_ERROR_HAVE_NO_MEMORY(r->data.srv.nameTarget);
+ break;
+ case DNS_QTYPE_MX:
+ r->data.mx.wPriority = rrec->rdata.mx_record.preference;
+ r->data.mx.nameTarget = talloc_strdup(mem_ctx,
+ rrec->rdata.mx_record.exchange);
+ W_ERROR_HAVE_NO_MEMORY(r->data.mx.nameTarget);
+ break;
+ case DNS_QTYPE_TXT:
+ r->data.txt = talloc_strdup(mem_ctx, rrec->rdata.txt_record.txt);
+ W_ERROR_HAVE_NO_MEMORY(r->data.txt);
+ break;
+ default:
+ DEBUG(0, ("Got a qytpe of %d\n", rrec->rr_type));
+ return DNS_ERR(NOT_IMPLEMENTED);
+ }
+
+done:
+
+ return WERR_OK;
+}
+
WERROR dns_server_process_update(struct dns_server *dns,
TALLOC_CTX *mem_ctx,
struct dns_name_packet *in,
- struct dns_res_rec *prereqs, uint16_t prereq_count,
+ struct dns_res_rec **prereqs, uint16_t *prereq_count,
struct dns_res_rec **updates, uint16_t *update_count,
struct dns_res_rec **additional, uint16_t *arcount)
{
@@ -171,7 +360,10 @@ WERROR dns_server_process_update(struct dns_server *dns,
return DNS_ERR(NOT_IMPLEMENTED);
}
- werror = check_prerequsites(dns, mem_ctx, in, prereqs, prereq_count);
+ *prereq_count = in->ancount;
+ *prereqs = in->answers;
+ werror = check_prerequisites(dns, mem_ctx, in->questions, *prereqs,
+ *prereq_count);
W_ERROR_NOT_OK_RETURN(werror);
/* TODO: Check if update is allowed, we probably want "always",
diff --git a/source4/scripting/python/samba/tests/dns.py b/source4/scripting/python/samba/tests/dns.py
index ed78d56dd3..ca9edbf500 100644
--- a/source4/scripting/python/samba/tests/dns.py
+++ b/source4/scripting/python/samba/tests/dns.py
@@ -236,6 +236,85 @@ class DNSTest(TestCase):
response = self.dns_transaction_udp(p)
self.assert_dns_rcode_equals(response, dns.DNS_RCODE_NOTIMP)
+ def test_update_prereq_with_non_null_ttl(self):
+ "test update with a non-null TTL"
+ 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)
+
+ prereqs = []
+ r = dns.res_rec()
+ r.name = "%s.%s" % (os.getenv('DC_SERVER'), self.get_dns_domain())
+ r.rr_type = dns.DNS_QTYPE_TXT
+ r.rr_class = dns.DNS_QCLASS_NONE
+ r.ttl = 1
+ r.length = 0
+ prereqs.append(r)
+
+ p.ancount = len(prereqs)
+ p.answers = prereqs
+
+ response = self.dns_transaction_udp(p)
+ self.assert_dns_rcode_equals(response, dns.DNS_RCODE_FORMERR)
+
+# I'd love to test this one, but it segfaults. :)
+# def test_update_prereq_with_non_null_length(self):
+# "test update with a non-null length"
+# 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)
+#
+# prereqs = []
+# r = dns.res_rec()
+# r.name = "%s.%s" % (os.getenv('DC_SERVER'), self.get_dns_domain())
+# r.rr_type = dns.DNS_QTYPE_TXT
+# r.rr_class = dns.DNS_QCLASS_ANY
+# r.ttl = 0
+# r.length = 1
+# prereqs.append(r)
+#
+# p.ancount = len(prereqs)
+# p.answers = prereqs
+#
+# response = self.dns_transaction_udp(p)
+# self.assert_dns_rcode_equals(response, dns.DNS_RCODE_FORMERR)
+
+ def test_update_prereq_nonexisting_name(self):
+ "test update with a non-null TTL"
+ 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)
+
+ prereqs = []
+ r = dns.res_rec()
+ r.name = "idontexist.%s" % self.get_dns_domain()
+ r.rr_type = dns.DNS_QTYPE_TXT
+ r.rr_class = dns.DNS_QCLASS_ANY
+ r.ttl = 0
+ r.length = 0
+ prereqs.append(r)
+
+ p.ancount = len(prereqs)
+ p.answers = prereqs
+
+ response = self.dns_transaction_udp(p)
+ self.assert_dns_rcode_equals(response, dns.DNS_RCODE_NXRRSET)
+
if __name__ == "__main__":
import unittest
unittest.main()
generated by cgit (git 2.34.1) at 2024-12-11 23:45:35 +0000