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-rw-r--r--source4/dns_server/dns_utils.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/source4/dns_server/dns_utils.c b/source4/dns_server/dns_utils.c
new file mode 100644
index 0000000000..2c86f0d52e
--- /dev/null
+++ b/source4/dns_server/dns_utils.c
@@ -0,0 +1,156 @@
+/*
+ Unix SMB/CIFS implementation.
+
+ DNS server utils
+
+ Copyright (C) 2010 Kai Blin <kai@samba.org>
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "libcli/util/ntstatus.h"
+#include "librpc/ndr/libndr.h"
+#include "librpc/gen_ndr/ndr_dns.h"
+#include "librpc/gen_ndr/ndr_dnsp.h"
+#include <ldb.h>
+#include "dsdb/samdb/samdb.h"
+#include "dsdb/common/util.h"
+#include "dns_server/dns_server.h"
+
+NTSTATUS dns_err_to_ntstatus(enum dns_rcode rcode)
+{
+ switch (rcode) {
+ case DNS_RCODE_OK: return NT_STATUS_OK;
+ case DNS_RCODE_FORMERR: return NT_STATUS_INVALID_PARAMETER;
+ case DNS_RCODE_SERVFAIL: return NT_STATUS_INTERNAL_ERROR;
+ case DNS_RCODE_NXDOMAIN: return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ case DNS_RCODE_NOTIMP: return NT_STATUS_NOT_IMPLEMENTED;
+ case DNS_RCODE_REFUSED: return NT_STATUS_ACCESS_DENIED;
+ case DNS_RCODE_NOTAUTH: return NT_STATUS_FOOBAR;
+ default: return NT_STATUS_NONE_MAPPED;
+ }
+}
+
+uint8_t ntstatus_to_dns_err(NTSTATUS status)
+{
+ if (NT_STATUS_EQUAL(NT_STATUS_OK, status)) {
+ return DNS_RCODE_OK;
+ } else if (NT_STATUS_EQUAL(NT_STATUS_INVALID_PARAMETER, status)) {
+ return DNS_RCODE_FORMERR;
+ } else if (NT_STATUS_EQUAL(NT_STATUS_INTERNAL_ERROR, status)) {
+ return DNS_RCODE_SERVFAIL;
+ } else if (NT_STATUS_EQUAL(NT_STATUS_OBJECT_NAME_NOT_FOUND, status)) {
+ return DNS_RCODE_NXDOMAIN;
+ } else if (NT_STATUS_EQUAL(NT_STATUS_NOT_IMPLEMENTED, status)) {
+ return DNS_RCODE_NOTIMP;
+ } else if (NT_STATUS_EQUAL(NT_STATUS_ACCESS_DENIED, status)) {
+ return DNS_RCODE_REFUSED;
+ } else if (NT_STATUS_EQUAL(NT_STATUS_FOOBAR, status)) {
+ return DNS_RCODE_NOTAUTH;
+ }
+ DEBUG(0, ("No mapping exists for %s\n", nt_errstr(status)));
+ return DNS_RCODE_NOTIMP;
+}
+
+bool dns_name_match(const char *zone, const char *name, size_t *host_part_len)
+{
+ size_t zl = strlen(zone);
+ size_t nl = strlen(name);
+ ssize_t zi, ni;
+ static const size_t fixup = 'a' - 'A';
+
+ if (zl > nl) {
+ return false;
+ }
+
+ for (zi = zl, ni = nl; zi >= 0; zi--, ni--) {
+ char zc = zone[zi];
+ char nc = name[ni];
+
+ /* convert to lower case */
+ if (zc >= 'A' && zc <= 'Z') {
+ zc += fixup;
+ }
+ if (nc >= 'A' && nc <= 'Z') {
+ nc += fixup;
+ }
+
+ if (zc != nc) {
+ return false;
+ }
+ }
+
+ if (ni >= 0) {
+ if (name[ni] != '.') {
+ return false;
+ }
+
+ ni--;
+ }
+
+ *host_part_len = ni+1;
+
+ return true;
+}
+
+NTSTATUS dns_name2dn(struct dns_server *dns,
+ TALLOC_CTX *mem_ctx,
+ const char *name,
+ struct ldb_dn **_dn)
+{
+ struct ldb_dn *base;
+ struct ldb_dn *dn;
+ const struct dns_server_zone *z;
+ size_t host_part_len = 0;
+
+ if (name == NULL) {
+ return NT_STATUS_INVALID_PARAMETER;
+ }
+
+ /*TODO: Check if 'name' is a valid DNS name */
+
+ if (strcmp(name, "") == 0) {
+ base = ldb_get_default_basedn(dns->samdb);
+ dn = ldb_dn_copy(mem_ctx, base);
+ ldb_dn_add_child_fmt(dn, "DC=@,DC=RootDNSServers,CN=MicrosoftDNS,CN=System");
+ *_dn = dn;
+ return NT_STATUS_OK;
+ }
+
+ for (z = dns->zones; z != NULL; z = z->next) {
+ bool match;
+
+ match = dns_name_match(z->name, name, &host_part_len);
+ if (match) {
+ break;
+ }
+ }
+
+ if (z == NULL) {
+ return NT_STATUS_OBJECT_NAME_NOT_FOUND;
+ }
+
+ if (host_part_len == 0) {
+ dn = ldb_dn_copy(mem_ctx, z->dn);
+ ldb_dn_add_child_fmt(dn, "DC=@");
+ *_dn = dn;
+ return NT_STATUS_OK;
+ }
+
+ dn = ldb_dn_copy(mem_ctx, z->dn);
+ ldb_dn_add_child_fmt(dn, "DC=%*.*s", (int)host_part_len, (int)host_part_len, name);
+ *_dn = dn;
+ return NT_STATUS_OK;
+}