3 Samba Unix/Linux Dynamic DNS Update
6 Copyright (C) Krishna Ganugapati (krishnag@centeris.com) 2006
7 Copyright (C) Gerald Carter 2006
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 3 of the License, or
12 (at your option) any later version.
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.
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.
25 #include "utils/net.h"
28 #if defined(WITH_DNS_UPDATES)
30 /*********************************************************************
31 *********************************************************************/
33 DNS_ERROR DoDNSUpdate(char *pszServerName,
34 const char *pszDomainName, const char *pszHostName,
35 const struct in_addr *iplist, size_t num_addrs )
38 struct dns_connection *conn;
41 struct dns_update_request *req, *resp;
43 if ( (num_addrs <= 0) || !iplist ) {
44 return ERROR_DNS_INVALID_PARAMETER;
47 if (!(mem_ctx = talloc_init("DoDNSUpdate"))) {
48 return ERROR_DNS_NO_MEMORY;
51 err = dns_open_connection( pszServerName, DNS_TCP, mem_ctx, &conn );
52 if (!ERR_DNS_IS_OK(err)) {
57 * Probe if everything's fine
60 err = dns_create_probe(mem_ctx, pszDomainName, pszHostName,
61 num_addrs, iplist, &req);
62 if (!ERR_DNS_IS_OK(err)) goto error;
64 err = dns_update_transaction(mem_ctx, conn, req, &resp);
65 if (!ERR_DNS_IS_OK(err)) goto error;
67 if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
69 return ERROR_DNS_SUCCESS;
73 * First try without signing
76 err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
77 iplist, num_addrs, &req);
78 if (!ERR_DNS_IS_OK(err)) goto error;
80 err = dns_update_transaction(mem_ctx, conn, req, &resp);
81 if (!ERR_DNS_IS_OK(err)) goto error;
83 if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
85 return ERROR_DNS_SUCCESS;
89 * Okay, we have to try with signing
92 gss_ctx_id_t gss_context;
95 if (!(keyname = dns_generate_keyname( mem_ctx ))) {
96 err = ERROR_DNS_NO_MEMORY;
100 err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
101 keyname, &gss_context, DNS_SRV_ANY );
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,
110 if (!ERR_DNS_IS_OK(err))
114 err = dns_sign_update(req, gss_context, keyname,
115 "gss.microsoft.com", time(NULL), 3600);
117 gss_delete_sec_context(&minor, &gss_context, GSS_C_NO_BUFFER);
119 if (!ERR_DNS_IS_OK(err)) goto error;
121 err = dns_update_transaction(mem_ctx, conn, req, &resp);
122 if (!ERR_DNS_IS_OK(err)) goto error;
124 err = (dns_response_code(resp->flags) == DNS_NO_ERROR) ?
125 ERROR_DNS_SUCCESS : ERROR_DNS_UPDATE_FAILED;
130 TALLOC_FREE(mem_ctx);
134 /*********************************************************************
135 *********************************************************************/
137 int get_my_ip_address( struct in_addr **ips )
139 struct iface_struct nics[MAX_INTERFACES];
141 struct in_addr loopback_ip = *interpret_addr2("127.0.0.1");
142 struct in_addr *list;
145 /* find the first non-loopback address from our list of interfaces */
147 n = get_interfaces(nics, MAX_INTERFACES);
149 if ( (list = SMB_MALLOC_ARRAY( struct in_addr, n )) == NULL ) {
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 ) );
163 DNS_ERROR do_gethostbyname(const char *server, const char *host)
165 struct dns_connection *conn;
166 struct dns_request *req, *resp;
169 err = dns_open_connection(server, DNS_UDP, NULL, &conn);
170 if (!ERR_DNS_IS_OK(err)) goto error;
172 err = dns_create_query(conn, host, QTYPE_A, DNS_CLASS_IN, &req);
173 if (!ERR_DNS_IS_OK(err)) goto error;
175 err = dns_transaction(conn, conn, req, &resp);
182 #endif /* defined(WITH_DNS_UPDATES) */