source3/utils/net_dns.c

   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
  26 #if defined(WITH_DNS_UPDATES)
  27 /*
  28  * Silly prototype to get rid of a warning
  29  */
  30
  31 DNS_ERROR DoDNSUpdate(char *pszServerName,
  32                       const char *pszDomainName, const char *pszHostName,
  33                       const struct sockaddr_storage *sslist,
  34                       size_t num_addrs );
  35
  36 /*********************************************************************
  37 *********************************************************************/
  38
  39 DNS_ERROR DoDNSUpdate(char *pszServerName,
  40                       const char *pszDomainName, const char *pszHostName,
  41                       const struct sockaddr_storage *sslist, size_t num_addrs )
  42 {
  43         DNS_ERROR err;
  44         struct dns_connection *conn;
  45         TALLOC_CTX *mem_ctx;
  46         OM_uint32 minor;
  47         struct dns_update_request *req, *resp;
  48
  49         if ( (num_addrs <= 0) || !sslist ) {
  50                 return ERROR_DNS_INVALID_PARAMETER;
  51         }
  52
  53         if (!(mem_ctx = talloc_init("DoDNSUpdate"))) {
  54                 return ERROR_DNS_NO_MEMORY;
  55         }
  56
  57         err = dns_open_connection( pszServerName, DNS_TCP, mem_ctx, &conn );
  58         if (!ERR_DNS_IS_OK(err)) {
  59                 goto error;
  60         }
  61
  62         /*
  63          * Probe if everything's fine
  64          */
  65
  66         err = dns_create_probe(mem_ctx, pszDomainName, pszHostName,
  67                                num_addrs, sslist, &req);
  68         if (!ERR_DNS_IS_OK(err)) goto error;
  69
  70         err = dns_update_transaction(mem_ctx, conn, req, &resp);
  71         if (!ERR_DNS_IS_OK(err)) goto error;
  72
  73         if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
  74                 TALLOC_FREE(mem_ctx);
  75                 return ERROR_DNS_SUCCESS;
  76         }
  77
  78         /*
  79          * First try without signing
  80          */
  81
  82         err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
  83                                         sslist, num_addrs, &req);
  84         if (!ERR_DNS_IS_OK(err)) goto error;
  85
  86         err = dns_update_transaction(mem_ctx, conn, req, &resp);
  87         if (!ERR_DNS_IS_OK(err)) goto error;
  88
  89         if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
  90                 TALLOC_FREE(mem_ctx);
  91                 return ERROR_DNS_SUCCESS;
  92         }
  93
  94         /*
  95          * Okay, we have to try with signing
  96          */
  97         {
  98                 gss_ctx_id_t gss_context;
  99                 char *keyname;
 100
 101                 if (!(keyname = dns_generate_keyname( mem_ctx ))) {
 102                         err = ERROR_DNS_NO_MEMORY;
 103                         goto error;
 104                 }
 105
 106                 err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
 107                                              keyname, &gss_context, DNS_SRV_ANY );
 108
 109                 /* retry using the Windows 2000 DNS hack */
 110                 if (!ERR_DNS_IS_OK(err)) {
 111                         err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
 112                                                      keyname, &gss_context,
 113                                                      DNS_SRV_WIN2000 );
 114                 }
 115
 116                 if (!ERR_DNS_IS_OK(err))
 117                         goto error;
 118
 119                 err = dns_sign_update(req, gss_context, keyname,
 120                                       "gss.microsoft.com", time(NULL), 3600);
 121
 122                 gss_delete_sec_context(&minor, &gss_context, GSS_C_NO_BUFFER);
 123
 124                 if (!ERR_DNS_IS_OK(err)) goto error;
 125
 126                 err = dns_update_transaction(mem_ctx, conn, req, &resp);
 127                 if (!ERR_DNS_IS_OK(err)) goto error;
 128
 129                 err = (dns_response_code(resp->flags) == DNS_NO_ERROR) ?
 130                         ERROR_DNS_SUCCESS : ERROR_DNS_UPDATE_FAILED;
 131         }
 132
 133
 134 error:
 135         TALLOC_FREE(mem_ctx);
 136         return err;
 137 }
 138
 139 /*********************************************************************
 140 *********************************************************************/
 141
 142 int get_my_ip_address( struct sockaddr_storage **pp_ss )
 143
 144 {
 145         int i, n;
 146         struct sockaddr_storage *list = NULL;
 147         int count = 0;
 148
 149         /* Honor the configured list of interfaces to register */
 150
 151         load_interfaces();
 152         n = iface_count();
 153
 154         if (n <= 0) {
 155                 return -1;
 156         }
 157
 158         if ( (list = SMB_MALLOC_ARRAY( struct sockaddr_storage, n )) == NULL ) {
 159                 return -1;
 160         }
 161
 162         for ( i=0; i<n; i++ ) {
 163                 const struct sockaddr_storage *nic_sa_storage = NULL;
 164
 165                 if ((nic_sa_storage = iface_n_sockaddr_storage(i)) == NULL)
 166                         continue;
 167
 168                 /* Don't register loopback addresses */
 169                 if (is_loopback_addr((const struct sockaddr *)nic_sa_storage)) {
 170                         continue;
 171                 }
 172
 173                 /* Don't register link-local addresses */
 174                 if (is_linklocal_addr(nic_sa_storage)) {
 175                         continue;
 176                 }
 177
 178                 memcpy(&list[count++], nic_sa_storage, sizeof(struct sockaddr_storage));
 179         }
 180         *pp_ss = list;
 181
 182         return count;
 183 }
 184
 185 /*
 186  * Silly prototype to get rid of a warning
 187  */
 188
 189 DNS_ERROR do_gethostbyname(const char *server, const char *host);
 190
 191 DNS_ERROR do_gethostbyname(const char *server, const char *host)
 192 {
 193         struct dns_connection *conn;
 194         struct dns_request *req, *resp;
 195         DNS_ERROR err;
 196
 197         err = dns_open_connection(server, DNS_UDP, NULL, &conn);
 198         if (!ERR_DNS_IS_OK(err)) goto error;
 199
 200         err = dns_create_query(conn, host, QTYPE_A, DNS_CLASS_IN, &req);
 201         if (!ERR_DNS_IS_OK(err)) goto error;
 202
 203         err = dns_transaction(conn, conn, req, &resp);
 204
 205  error:
 206         TALLOC_FREE(conn);
 207         return err;
 208 }
 209
 210 #endif  /* defined(WITH_DNS_UPDATES) */