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