2 Unix SMB/CIFS implementation.
4 DNS server handler for queries
6 Copyright (C) 2010 Kai Blin <kai@samba.org>
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "libcli/util/werror.h"
24 #include "librpc/ndr/libndr.h"
25 #include "librpc/gen_ndr/ndr_dns.h"
26 #include "librpc/gen_ndr/ndr_dnsp.h"
28 #include "dsdb/samdb/samdb.h"
29 #include "dsdb/common/util.h"
30 #include "dns_server/dns_server.h"
32 static WERROR create_response_rr(const struct dns_name_question *question,
33 const struct dnsp_DnssrvRpcRecord *rec,
34 struct dns_res_rec **answers, uint16_t *ancount)
36 struct dns_res_rec *ans = *answers;
37 uint16_t ai = *ancount;
43 ans[ai].rdata.cname_record = talloc_strdup(ans, rec->data.cname);
46 ans[ai].rdata.ipv4_record = talloc_strdup(ans, rec->data.ipv4);
49 ans[ai].rdata.ipv6_record = rec->data.ipv6;
52 ans[ai].rdata.ns_record = rec->data.ns;
55 ans[ai].rdata.srv_record.priority = rec->data.srv.wPriority;
56 ans[ai].rdata.srv_record.weight = rec->data.srv.wWeight;
57 ans[ai].rdata.srv_record.port = rec->data.srv.wPort;
58 ans[ai].rdata.srv_record.target = rec->data.srv.nameTarget;
61 ans[ai].rdata.soa_record.mname = rec->data.soa.mname;
62 ans[ai].rdata.soa_record.rname = rec->data.soa.rname;
63 ans[ai].rdata.soa_record.serial = rec->data.soa.serial;
64 ans[ai].rdata.soa_record.refresh = rec->data.soa.refresh;
65 ans[ai].rdata.soa_record.retry = rec->data.soa.retry;
66 ans[ai].rdata.soa_record.expire = rec->data.soa.expire;
67 ans[ai].rdata.soa_record.minimum = rec->data.soa.minimum;
70 ans[ai].rdata.ptr_record = talloc_strdup(ans, rec->data.ptr);
73 return DNS_ERR(NOT_IMPLEMENTED);
76 ans[ai].name = talloc_strdup(ans, question->name);
77 ans[ai].rr_type = rec->wType;
78 ans[ai].rr_class = DNS_QCLASS_IN;
79 ans[ai].ttl = rec->dwTtlSeconds;
80 ans[ai].length = UINT16_MAX;
89 static WERROR handle_question(struct dns_server *dns,
91 const struct dns_name_question *question,
92 struct dns_res_rec **answers, uint16_t *ancount)
94 struct dns_res_rec *ans;
97 struct dnsp_DnssrvRpcRecord *recs;
98 uint16_t rec_count, ai = 0;
99 struct ldb_dn *dn = NULL;
101 werror = dns_name2dn(dns, mem_ctx, question->name, &dn);
102 W_ERROR_NOT_OK_RETURN(werror);
104 werror = dns_lookup_records(dns, mem_ctx, dn, &recs, &rec_count);
105 W_ERROR_NOT_OK_RETURN(werror);
107 ans = talloc_zero_array(mem_ctx, struct dns_res_rec, rec_count);
108 W_ERROR_HAVE_NO_MEMORY(ans);
110 for (ri = 0; ri < rec_count; ri++) {
111 if ((question->question_type != DNS_QTYPE_ALL) &&
112 (recs[ri].wType != question->question_type)) {
115 werror = create_response_rr(question, &recs[ri], &ans, &ai);
116 W_ERROR_NOT_OK_RETURN(werror);
120 return DNS_ERR(NAME_ERROR);
130 WERROR dns_server_process_query(struct dns_server *dns,
132 struct dns_name_packet *in,
133 struct dns_res_rec **answers, uint16_t *ancount,
134 struct dns_res_rec **nsrecs, uint16_t *nscount,
135 struct dns_res_rec **additional, uint16_t *arcount)
137 uint16_t num_answers=0;
138 struct dns_res_rec *ans=NULL;
141 if (in->qdcount != 1) {
142 return DNS_ERR(FORMAT_ERROR);
145 /* Windows returns NOT_IMPLEMENTED on this as well */
146 if (in->questions[0].question_class == DNS_QCLASS_NONE) {
147 return DNS_ERR(NOT_IMPLEMENTED);
150 werror = handle_question(dns, mem_ctx, &in->questions[0], &ans, &num_answers);
151 W_ERROR_NOT_OK_GOTO(werror, query_failed);
154 *ancount = num_answers;
156 /*FIXME: Do something for these */
166 /*FIXME: add our SOA record to nsrecs */