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/*
Samba Unix/Linux Dynamic DNS Update
net ads commands
Copyright (C) Krishna Ganugapati (krishnag@centeris.com) 2006
Copyright (C) Gerald Carter 2006
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "utils/net.h"
#include "dns.h"
#if defined(WITH_DNS_UPDATES)
/*********************************************************************
*********************************************************************/
DNS_ERROR DoDNSUpdate(ADS_STRUCT *ads, char *pszServerName,
const char *pszDomainName, const char *pszHostName,
const struct in_addr *iplist, int num_addrs )
{
DNS_ERROR err;
struct dns_connection *conn;
TALLOC_CTX *mem_ctx;
OM_uint32 minor;
struct dns_update_request *req, *resp;
if ( (num_addrs <= 0) || !iplist ) {
return ERROR_DNS_INVALID_PARAMETER;
}
if (!(mem_ctx = talloc_init("DoDNSUpdate"))) {
return ERROR_DNS_NO_MEMORY;
}
err = dns_open( pszServerName, DNS_TCP, mem_ctx, &conn );
if (!ERR_DNS_IS_OK(err)) {
goto error;
}
/*
* Probe if everything's fine
*/
err = dns_create_probe(mem_ctx, pszDomainName, pszHostName,
num_addrs, iplist, &req);
if (!ERR_DNS_IS_OK(err)) goto error;
err = dns_update_transaction(mem_ctx, conn, req, &resp);
if (!ERR_DNS_IS_OK(err)) goto error;
if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
TALLOC_FREE(mem_ctx);
return ERROR_DNS_SUCCESS;
}
/*
* First try without signing
*/
err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
iplist[0].s_addr, &req);
if (!ERR_DNS_IS_OK(err)) goto error;
err = dns_update_transaction(mem_ctx, conn, req, &resp);
if (!ERR_DNS_IS_OK(err)) goto error;
if (dns_response_code(resp->flags) == DNS_NO_ERROR) {
TALLOC_FREE(mem_ctx);
return ERROR_DNS_SUCCESS;
}
/*
* Okay, we have to try with signing
*/
{
ADS_STRUCT *ads_s;
gss_ctx_id_t gss_context;
int res;
char *keyname;
if (!(keyname = dns_generate_keyname( mem_ctx ))) {
err = ERROR_DNS_NO_MEMORY;
goto error;
}
if (!(ads_s = ads_init(ads->server.realm, ads->server.workgroup,
ads->server.ldap_server))) {
return ERROR_DNS_NO_MEMORY;
}
/* kinit with the machine password */
setenv(KRB5_ENV_CCNAME, "MEMORY:net_ads", 1);
asprintf( &ads_s->auth.user_name, "%s$", global_myname() );
ads_s->auth.password = secrets_fetch_machine_password(
lp_workgroup(), NULL, NULL );
ads_s->auth.realm = SMB_STRDUP( lp_realm() );
res = ads_kinit_password( ads_s );
ads_destroy(&ads_s);
if (res) {
err = ERROR_DNS_GSS_ERROR;
goto error;
}
err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
keyname, &gss_context, DNS_SRV_ANY );
/* retry using the Windows 2000 DNS hack */
if (!ERR_DNS_IS_OK(err)) {
err = dns_negotiate_sec_ctx( pszDomainName, pszServerName,
keyname, &gss_context,
DNS_SRV_WIN2000 );
}
if (!ERR_DNS_IS_OK(err))
goto error;
err = dns_sign_update(req, gss_context, keyname,
"gss.microsoft.com", time(NULL), 3600);
gss_delete_sec_context(&minor, &gss_context, GSS_C_NO_BUFFER);
if (!ERR_DNS_IS_OK(err)) goto error;
err = dns_update_transaction(mem_ctx, conn, req, &resp);
if (!ERR_DNS_IS_OK(err)) goto error;
err = (dns_response_code(resp->flags) == DNS_NO_ERROR) ?
ERROR_DNS_SUCCESS : ERROR_DNS_UPDATE_FAILED;
}
error:
TALLOC_FREE(mem_ctx);
return err;
}
/*********************************************************************
*********************************************************************/
int get_my_ip_address( struct in_addr **ips )
{
struct iface_struct nics[MAX_INTERFACES];
int i, n;
struct in_addr loopback_ip = *interpret_addr2("127.0.0.1");
struct in_addr *list;
int count = 0;
/* find the first non-loopback address from our list of interfaces */
n = get_interfaces(nics, MAX_INTERFACES);
if ( (list = SMB_MALLOC_ARRAY( struct in_addr, n )) == NULL ) {
return -1;
}
for ( i=0; i<n; i++ ) {
if ( nics[i].ip.s_addr != loopback_ip.s_addr ) {
memcpy( &list[count++], &nics[i].ip, sizeof( struct in_addr ) );
}
}
*ips = list;
return count;
}
DNS_ERROR do_gethostbyname(const char *server, const char *host)
{
struct dns_connection *conn;
struct dns_request *req, *resp;
DNS_ERROR err;
err = dns_open(server, DNS_UDP, NULL, &conn);
if (!ERR_DNS_IS_OK(err)) goto error;
err = dns_create_query(conn, host, QTYPE_A, DNS_CLASS_IN, &req);
if (!ERR_DNS_IS_OK(err)) goto error;
err = dns_transaction(conn, conn, req, &resp);
error:
TALLOC_FREE(conn);
return err;
}
#endif /* defined(WITH_DNS_UPDATES) */
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