source: vendor/3.6.23/source3/utils/net_dns.c

Last change on this file was 860, checked in by Silvan Scherrer, 11 years ago

Samba 3.6: updated vendor to latest version
File size: 5.6 KB
Line 
1/*
2 Samba Unix/Linux Dynamic DNS Update
3 net ads commands
4
5 Copyright (C) Krishna Ganugapati (krishnag@centeris.com) 2006
6 Copyright (C) Gerald Carter 2006
7
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.
12
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.
17
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/>.
20*/
21
22#include "includes.h"
23#include "utils/net.h"
24#include "../lib/addns/dns.h"
25#include "utils/net_dns.h"
26
27#if defined(WITH_DNS_UPDATES)
28
29/*********************************************************************
30*********************************************************************/
31
32DNS_ERROR DoDNSUpdate(char *pszServerName,
33 const char *pszDomainName, const char *pszHostName,
34 const struct sockaddr_storage *sslist, size_t num_addrs,
35 uint32_t flags)
36{
37 DNS_ERROR err;
38 struct dns_connection *conn;
39 TALLOC_CTX *mem_ctx;
40 OM_uint32 minor;
41 struct dns_update_request *req, *resp;
42
43 DEBUG(10,("DoDNSUpdate called with flags: 0x%08x\n", flags));
44
45 if (!(flags & DNS_UPDATE_SIGNED) &&
46 !(flags & DNS_UPDATE_UNSIGNED) &&
47 !(flags & DNS_UPDATE_PROBE)) {
48 return ERROR_DNS_INVALID_PARAMETER;
49 }
50
51 if ( (num_addrs <= 0) || !sslist ) {
52 return ERROR_DNS_INVALID_PARAMETER;
53 }
54
55 if (!(mem_ctx = talloc_init("DoDNSUpdate"))) {
56 return ERROR_DNS_NO_MEMORY;
57 }
58
59 err = dns_open_connection( pszServerName, DNS_TCP, mem_ctx, &conn );
60 if (!ERR_DNS_IS_OK(err)) {
61 goto error;
62 }
63
64 if (flags & DNS_UPDATE_PROBE) {
65
66 /*
67 * Probe if everything's fine
68 */
69
70 err = dns_create_probe(mem_ctx, pszDomainName, pszHostName,
71 num_addrs, sslist, &req);
72 if (!ERR_DNS_IS_OK(err)) goto error;
73
74 err = dns_update_transaction(mem_ctx, conn, req, &resp);
75 if (!ERR_DNS_IS_OK(err)) goto error;
76
77 if (!ERR_DNS_IS_OK(err)) {
78 DEBUG(3,("DoDNSUpdate: failed to probe DNS\n"));
79 }
80
81 if ((dns_response_code(resp->flags) == DNS_NO_ERROR) &&
82 (flags & DNS_UPDATE_PROBE_SUFFICIENT)) {
83 TALLOC_FREE(mem_ctx);
84 return ERROR_DNS_SUCCESS;
85 }
86 }
87
88 if (flags & DNS_UPDATE_UNSIGNED) {
89
90 /*
91 * First try without signing
92 */
93
94 err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
95 sslist, num_addrs, &req);
96 if (!ERR_DNS_IS_OK(err)) goto error;
97
98 err = dns_update_transaction(mem_ctx, conn, req, &resp);
99 if (!ERR_DNS_IS_OK(err)) goto error;
100
101 if (!ERR_DNS_IS_OK(err)) {
102 DEBUG(3,("DoDNSUpdate: unsigned update failed\n"));
103 }
104
105 if ((dns_response_code(resp->flags) == DNS_NO_ERROR) &&
106 (flags & DNS_UPDATE_UNSIGNED_SUFFICIENT)) {
107 TALLOC_FREE(mem_ctx);
108 return ERROR_DNS_SUCCESS;
109 }
110 }
111
112 /*
113 * Okay, we have to try with signing
114 */
115 if (flags & DNS_UPDATE_SIGNED) {
116 gss_ctx_id_t gss_context;
117 char *keyname;
118
119 err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
120 sslist, num_addrs, &req);
121 if (!ERR_DNS_IS_OK(err)) goto error;
122
123 if (!(keyname = dns_generate_keyname( mem_ctx ))) {
124 err = ERROR_DNS_NO_MEMORY;
125 goto error;
126 }
127
128 err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
129 keyname, &gss_context, DNS_SRV_ANY );
130
131 /* retry using the Windows 2000 DNS hack */
132 if (!ERR_DNS_IS_OK(err)) {
133 err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
134 keyname, &gss_context,
135 DNS_SRV_WIN2000 );
136 }
137
138 if (!ERR_DNS_IS_OK(err))
139 goto error;
140
141 err = dns_sign_update(req, gss_context, keyname,
142 "gss.microsoft.com", time(NULL), 3600);
143
144 gss_delete_sec_context(&minor, &gss_context, GSS_C_NO_BUFFER);
145
146 if (!ERR_DNS_IS_OK(err)) goto error;
147
148 err = dns_update_transaction(mem_ctx, conn, req, &resp);
149 if (!ERR_DNS_IS_OK(err)) goto error;
150
151 err = (dns_response_code(resp->flags) == DNS_NO_ERROR) ?
152 ERROR_DNS_SUCCESS : ERROR_DNS_UPDATE_FAILED;
153
154 if (!ERR_DNS_IS_OK(err)) {
155 DEBUG(3,("DoDNSUpdate: signed update failed\n"));
156 }
157 }
158
159
160error:
161 TALLOC_FREE(mem_ctx);
162 return err;
163}
164
165/*********************************************************************
166*********************************************************************/
167
168int get_my_ip_address( struct sockaddr_storage **pp_ss )
169
170{
171 int i, n;
172 struct sockaddr_storage *list = NULL;
173 int count = 0;
174
175 /* Honor the configured list of interfaces to register */
176
177 load_interfaces();
178 n = iface_count();
179
180 if (n <= 0) {
181 return -1;
182 }
183
184 if ( (list = SMB_MALLOC_ARRAY( struct sockaddr_storage, n )) == NULL ) {
185 return -1;
186 }
187
188 for ( i=0; i<n; i++ ) {
189 const struct sockaddr_storage *nic_sa_storage = NULL;
190
191 if ((nic_sa_storage = iface_n_sockaddr_storage(i)) == NULL)
192 continue;
193
194 /* Don't register loopback addresses */
195 if (is_loopback_addr((struct sockaddr *)nic_sa_storage)) {
196 continue;
197 }
198
199 memcpy(&list[count++], nic_sa_storage, sizeof(struct sockaddr_storage));
200 }
201 *pp_ss = list;
202
203 return count;
204}
205
206DNS_ERROR do_gethostbyname(const char *server, const char *host)
207{
208 struct dns_connection *conn;
209 struct dns_request *req, *resp;
210 DNS_ERROR err;
211
212 err = dns_open_connection(server, DNS_UDP, NULL, &conn);
213 if (!ERR_DNS_IS_OK(err)) goto error;
214
215 err = dns_create_query(conn, host, QTYPE_A, DNS_CLASS_IN, &req);
216 if (!ERR_DNS_IS_OK(err)) goto error;
217
218 err = dns_transaction(conn, conn, req, &resp);
219
220 error:
221 TALLOC_FREE(conn);
222 return err;
223}
224
225#endif /* defined(WITH_DNS_UPDATES) */
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