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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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "utils/net.h"
#include "../lib/addns/dns.h"
#include "utils/net_dns.h"
#if defined(WITH_DNS_UPDATES)
/*********************************************************************
*********************************************************************/
DNS_ERROR DoDNSUpdate(char *pszServerName,
const char *pszDomainName, const char *pszHostName,
const struct sockaddr_storage *sslist, size_t num_addrs,
uint32_t flags)
{
DNS_ERROR err;
struct dns_connection *conn;
TALLOC_CTX *mem_ctx;
OM_uint32 minor;
struct dns_update_request *req, *resp;
DEBUG(10,("DoDNSUpdate called with flags: 0x%08x\n", flags));
if (!(flags & DNS_UPDATE_SIGNED) &&
!(flags & DNS_UPDATE_UNSIGNED) &&
!(flags & DNS_UPDATE_PROBE)) {
return ERROR_DNS_INVALID_PARAMETER;
}
if ( (num_addrs <= 0) || !sslist ) {
return ERROR_DNS_INVALID_PARAMETER;
}
if (!(mem_ctx = talloc_init("DoDNSUpdate"))) {
return ERROR_DNS_NO_MEMORY;
}
err = dns_open_connection( pszServerName, DNS_TCP, mem_ctx, &conn );
if (!ERR_DNS_IS_OK(err)) {
goto error;
}
if (flags & DNS_UPDATE_PROBE) {
/*
* Probe if everything's fine
*/
err = dns_create_probe(mem_ctx, pszDomainName, pszHostName,
num_addrs, sslist, &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 (!ERR_DNS_IS_OK(err)) {
DEBUG(3,("DoDNSUpdate: failed to probe DNS\n"));
}
if ((dns_response_code(resp->flags) == DNS_NO_ERROR) &&
(flags & DNS_UPDATE_PROBE_SUFFICIENT)) {
TALLOC_FREE(mem_ctx);
return ERROR_DNS_SUCCESS;
}
}
if (flags & DNS_UPDATE_UNSIGNED) {
/*
* First try without signing
*/
err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
sslist, num_addrs, &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 (!ERR_DNS_IS_OK(err)) {
DEBUG(3,("DoDNSUpdate: unsigned update failed\n"));
}
if ((dns_response_code(resp->flags) == DNS_NO_ERROR) &&
(flags & DNS_UPDATE_UNSIGNED_SUFFICIENT)) {
TALLOC_FREE(mem_ctx);
return ERROR_DNS_SUCCESS;
}
}
/*
* Okay, we have to try with signing
*/
if (flags & DNS_UPDATE_SIGNED) {
gss_ctx_id_t gss_context;
char *keyname;
err = dns_create_update_request(mem_ctx, pszDomainName, pszHostName,
sslist, num_addrs, &req);
if (!ERR_DNS_IS_OK(err)) goto error;
if (!(keyname = dns_generate_keyname( mem_ctx ))) {
err = ERROR_DNS_NO_MEMORY;
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;
if (!ERR_DNS_IS_OK(err)) {
DEBUG(3,("DoDNSUpdate: signed update failed\n"));
}
}
error:
TALLOC_FREE(mem_ctx);
return err;
}
/*********************************************************************
*********************************************************************/
int get_my_ip_address( struct sockaddr_storage **pp_ss )
{
int i, n;
struct sockaddr_storage *list = NULL;
int count = 0;
/* Honor the configured list of interfaces to register */
load_interfaces();
n = iface_count();
if (n <= 0) {
return -1;
}
if ( (list = SMB_MALLOC_ARRAY( struct sockaddr_storage, n )) == NULL ) {
return -1;
}
for ( i=0; i<n; i++ ) {
const struct sockaddr_storage *nic_sa_storage = NULL;
if ((nic_sa_storage = iface_n_sockaddr_storage(i)) == NULL)
continue;
/* Don't register loopback addresses */
if (is_loopback_addr((const struct sockaddr *)nic_sa_storage)) {
continue;
}
/* Don't register link-local addresses */
if (is_linklocal_addr(nic_sa_storage)) {
continue;
}
memcpy(&list[count++], nic_sa_storage, sizeof(struct sockaddr_storage));
}
*pp_ss = 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_connection(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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