source/utils/net_dns.c

   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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "utils/net.h"
  25 #include "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 in_addr *iplist, 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) || !iplist ) {
  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, iplist, &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                                         iplist, 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
 113                 err = dns_sign_update(req, gss_context, keyname,
 114                                       "gss.microsoft.com", time(NULL), 3600);
 115
 116                 gss_delete_sec_context(&minor, &gss_context, GSS_C_NO_BUFFER);
 117
 118                 if (!ERR_DNS_IS_OK(err)) goto error;
 119
 120                 err = dns_update_transaction(mem_ctx, conn, req, &resp);
 121                 if (!ERR_DNS_IS_OK(err)) goto error;
 122
 123                 err = (dns_response_code(resp->flags) == DNS_NO_ERROR) ?
 124                         ERROR_DNS_SUCCESS : ERROR_DNS_UPDATE_FAILED;
 125         }
 126
 127
 128 error:
 129         TALLOC_FREE(mem_ctx);
 130         return err;
 131 }
 132
 133 /*********************************************************************
 134 *********************************************************************/
 135
 136 int get_my_ip_address( struct in_addr **ips )
 137 {
 138         struct iface_struct nics[MAX_INTERFACES];
 139         int i, n;
 140         struct in_addr loopback_ip = *interpret_addr2("127.0.0.1");
 141         struct in_addr *list;
 142         int count = 0;
 143
 144         /* find the first non-loopback address from our list of interfaces */
 145
 146         n = get_interfaces(nics, MAX_INTERFACES);
 147
 148         if ( (list = SMB_MALLOC_ARRAY( struct in_addr, n )) == NULL ) {
 149                 return -1;
 150         }
 151
 152         for ( i=0; i<n; i++ ) {
 153                 if ( nics[i].ip.s_addr != loopback_ip.s_addr ) {
 154                         memcpy( &list[count++], &nics[i].ip, sizeof( struct in_addr ) );
 155                 }
 156         }
 157         *ips = list;
 158
 159         return count;
 160 }
 161
 162 DNS_ERROR do_gethostbyname(const char *server, const char *host)
 163 {
 164         struct dns_connection *conn;
 165         struct dns_request *req, *resp;
 166         DNS_ERROR err;
 167
 168         err = dns_open_connection(server, DNS_UDP, NULL, &conn);
 169         if (!ERR_DNS_IS_OK(err)) goto error;
 170
 171         err = dns_create_query(conn, host, QTYPE_A, DNS_CLASS_IN, &req);
 172         if (!ERR_DNS_IS_OK(err)) goto error;
 173
 174         err = dns_transaction(conn, conn, req, &resp);
 175
 176  error:
 177         TALLOC_FREE(conn);
 178         return err;
 179 }
 180
 181 #endif  /* defined(WITH_DNS_UPDATES) */