source: branches/samba-3.0/source/utils/net_dns.c

Last change on this file was 1, checked in by Paul Smedley, 18 years ago

Initial code import
File size: 4.6 KB
Line 
1
2/*
3 Samba Unix/Linux Dynamic DNS Update
4 net ads commands
5
6 Copyright (C) Krishna Ganugapati (krishnag@centeris.com) 2006
7 Copyright (C) Gerald Carter 2006
8
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 2 of the License, or
12 (at your option) any later version.
13
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
18
19 You should have received a copy of the GNU General Public License
20 along with this program; if not, write to the Free Software
21 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22*/
23
24#include "includes.h"
25#include "utils/net.h"
26#include "dns.h"
27
28#if defined(WITH_DNS_UPDATES)
29
30/*********************************************************************
31*********************************************************************/
32
33DNS_ERROR DoDNSUpdate(char *pszServerName,
34 const char *pszDomainName, const char *pszHostName,
35 const struct in_addr *iplist, size_t num_addrs )
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 if ( (num_addrs <= 0) || !iplist ) {
44 return ERROR_DNS_INVALID_PARAMETER;
45 }
46
47 if (!(mem_ctx = talloc_init("DoDNSUpdate"))) {
48 return ERROR_DNS_NO_MEMORY;
49 }
50
51 err = dns_open_connection( pszServerName, DNS_TCP, mem_ctx, &conn );
52 if (!ERR_DNS_IS_OK(err)) {
53 goto error;
54 }
55
56 /*
57 * Probe if everything's fine
58 */
59
60 err = dns_create_probe(mem_ctx, pszDomainName, pszHostName,
61 num_addrs, iplist, &req);
62 if (!ERR_DNS_IS_OK(err)) goto error;
63
64 err = dns_update_transaction(mem_ctx, conn, req, &resp);
65 if (!ERR_DNS_IS_OK(err)) goto error;
66
67 if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
68 TALLOC_FREE(mem_ctx);
69 return ERROR_DNS_SUCCESS;
70 }
71
72 /*
73 * First try without signing
74 */
75
76 err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
77 iplist, num_addrs, &req);
78 if (!ERR_DNS_IS_OK(err)) goto error;
79
80 err = dns_update_transaction(mem_ctx, conn, req, &resp);
81 if (!ERR_DNS_IS_OK(err)) goto error;
82
83 if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
84 TALLOC_FREE(mem_ctx);
85 return ERROR_DNS_SUCCESS;
86 }
87
88 /*
89 * Okay, we have to try with signing
90 */
91 {
92 gss_ctx_id_t gss_context;
93 char *keyname;
94
95 if (!(keyname = dns_generate_keyname( mem_ctx ))) {
96 err = ERROR_DNS_NO_MEMORY;
97 goto error;
98 }
99
100 err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
101 keyname, &gss_context, DNS_SRV_ANY );
102
103 /* retry using the Windows 2000 DNS hack */
104 if (!ERR_DNS_IS_OK(err)) {
105 err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
106 keyname, &gss_context,
107 DNS_SRV_WIN2000 );
108 }
109
110 if (!ERR_DNS_IS_OK(err))
111 goto error;
112
113
114 err = dns_sign_update(req, gss_context, keyname,
115 "gss.microsoft.com", time(NULL), 3600);
116
117 gss_delete_sec_context(&minor, &gss_context, GSS_C_NO_BUFFER);
118
119 if (!ERR_DNS_IS_OK(err)) goto error;
120
121 err = dns_update_transaction(mem_ctx, conn, req, &resp);
122 if (!ERR_DNS_IS_OK(err)) goto error;
123
124 err = (dns_response_code(resp->flags) == DNS_NO_ERROR) ?
125 ERROR_DNS_SUCCESS : ERROR_DNS_UPDATE_FAILED;
126 }
127
128
129error:
130 TALLOC_FREE(mem_ctx);
131 return err;
132}
133
134/*********************************************************************
135*********************************************************************/
136
137int get_my_ip_address( struct in_addr **ips )
138{
139 struct iface_struct nics[MAX_INTERFACES];
140 int i, n;
141 struct in_addr loopback_ip = *interpret_addr2("127.0.0.1");
142 struct in_addr *list;
143 int count = 0;
144
145 /* find the first non-loopback address from our list of interfaces */
146
147 n = get_interfaces(nics, MAX_INTERFACES);
148
149 if ( (list = SMB_MALLOC_ARRAY( struct in_addr, n )) == NULL ) {
150 return -1;
151 }
152
153 for ( i=0; i<n; i++ ) {
154 if ( nics[i].ip.s_addr != loopback_ip.s_addr ) {
155 memcpy( &list[count++], &nics[i].ip, sizeof( struct in_addr ) );
156 }
157 }
158 *ips = list;
159
160 return count;
161}
162
163DNS_ERROR do_gethostbyname(const char *server, const char *host)
164{
165 struct dns_connection *conn;
166 struct dns_request *req, *resp;
167 DNS_ERROR err;
168
169 err = dns_open_connection(server, DNS_UDP, NULL, &conn);
170 if (!ERR_DNS_IS_OK(err)) goto error;
171
172 err = dns_create_query(conn, host, QTYPE_A, DNS_CLASS_IN, &req);
173 if (!ERR_DNS_IS_OK(err)) goto error;
174
175 err = dns_transaction(conn, conn, req, &resp);
176
177 error:
178 TALLOC_FREE(conn);
179 return err;
180}
181
182#endif /* defined(WITH_DNS_UPDATES) */
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