r17798: Beginnings of a standalone libaddns library released under

the LGPL.   Original code by Krishna Ganugapati <krishnag@centeris.com>.
Additional work by me.

It's still got some warts, but non-secure updates do
currently work.  There are at least four things left to
really clean up.

1. Change the memory management to use talloc() rather than
   malloc() and cleanup the leaks.
2. Fix the error code reporting (see initial changes to
   dnserr.h)
3. Fix the secure updates
4. Define a public interface in addns.h
5. Move the code in libads/dns.c into the libaddns/ directory
   (and under the LGPL).

A few notes:

* Enable the new code by compiling with --with-dnsupdate
* Also adds the command 'net ads dns register'
* Requires -luuid (included in the e2fsprogs-devel package).
* Has only been tested on Linux platforms so there may be portability
  issues.
(This used to be commit 36f04674aeefd93c5a0408b8967dcd48b86fdbc1)

1 files changed, 397 insertions, 0 deletions

diff --git a/source3/libaddns/dnsupresp.c b/source3/libaddns/dnsupresp.c
new file mode 100644
index 0000000000..c5f7642acd
--- /dev/null
+++ b/source3/libaddns/dnsupresp.c
@@ -0,0 +1,397 @@
+/*
+  Linux DNS client library implementation
+
+  Copyright (C) 2006 Krishna Ganugapati <krishnag@centeris.com>
+  Copyright (C) 2006 Gerald Carter <jerry@samba.org>
+
+     ** NOTE! The following LGPL license applies to the libaddns
+     ** library. This does NOT imply that all of Samba is released
+     ** under the LGPL
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+  This library 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
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General Public
+  License along with this library; if not, write to the Free Software
+  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  
+  02110-1301  USA
+*/
+
+#include "dns.h"
+
+/*********************************************************************
+*********************************************************************/
+
+static int32 DNSUpdateAllocateResponse( DNS_UPDATE_RESPONSE ** ppDNSResponse )
+{
+	int32 dwError = 0;
+	DNS_UPDATE_RESPONSE *pDNSResponse = NULL;
+
+	dwError =
+		DNSAllocateMemory( sizeof( DNS_UPDATE_RESPONSE ),
+				   ( void ** ) &pDNSResponse );
+	BAIL_ON_ERROR( dwError );
+
+	*ppDNSResponse = pDNSResponse;
+
+	return dwError;
+
+      error:
+
+	*ppDNSResponse = NULL;
+
+	return dwError;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static int32 DNSUpdateUnmarshallAdditionalSection( HANDLE hReceiveBuffer,
+				      int16 wAdditionals,
+				      DNS_RR_RECORD *
+				      **pppDNSAdditionalsRRRecords )
+{
+	int32 dwError = 0;
+	int32 i = 0;
+	DNS_RR_RECORD *pDNSRRRecord = NULL;
+	DNS_RR_RECORD **ppDNSAdditionalRRRecords = NULL;
+	DNS_RR_HEADER RRHeader = { 0 };
+	DNS_RR_HEADER *pRRHeader = &RRHeader;
+	uint8 *pRRData = NULL;
+	int32 dwRead = 0;
+
+	dwError = DNSAllocateMemory( wAdditionals * sizeof( DNS_RR_RECORD * ),
+				     ( void ** ) &ppDNSAdditionalRRRecords );
+	BAIL_ON_ERROR( dwError );
+
+	for ( i = 0; i < wAdditionals; i++ ) {
+
+		memset( pRRHeader, 0, sizeof( DNS_RR_HEADER ) );
+		dwError = DNSUnmarshallRRHeader( hReceiveBuffer, pRRHeader );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSUnmarshallRData( hReceiveBuffer,
+					    pRRHeader->wRDataSize, &pRRData,
+					    &dwRead );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSAllocateMemory( sizeof( DNS_RR_RECORD ),
+					   ( void ** ) &pDNSRRRecord );
+		BAIL_ON_ERROR( dwError );
+
+		memcpy( &pDNSRRRecord->RRHeader, pRRHeader,
+			sizeof( DNS_RR_HEADER ) );
+		pDNSRRRecord->pRData = pRRData;
+
+		*( ppDNSAdditionalRRRecords + i ) = pDNSRRRecord;
+	}
+
+      error:
+
+	return dwError;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static int32 DNSUpdateUnmarshallPRSection( HANDLE hReceiveBuffer,
+			      int16 wPRs,
+			      DNS_RR_RECORD * **pppDNSPRRRRecords )
+{
+	int32 dwError = 0;
+	int32 i = 0;
+	DNS_RR_RECORD *pDNSRRRecord = NULL;
+	DNS_RR_RECORD **ppDNSPRRRRecords = NULL;
+	DNS_RR_HEADER RRHeader = { 0 };
+	DNS_RR_HEADER *pRRHeader = &RRHeader;
+	uint8 *pRRData = NULL;
+	int32 dwRead = 0;
+
+	dwError = DNSAllocateMemory( wPRs * sizeof( DNS_RR_RECORD * ),
+				     ( void ** ) &ppDNSPRRRRecords );
+	BAIL_ON_ERROR( dwError );
+
+	for ( i = 0; i < wPRs; i++ ) {
+
+		memset( pRRHeader, 0, sizeof( DNS_RR_HEADER ) );
+		dwError = DNSUnmarshallRRHeader( hReceiveBuffer, pRRHeader );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSUnmarshallRData( hReceiveBuffer,
+					    pRRHeader->wRDataSize, &pRRData,
+					    &dwRead );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSAllocateMemory( sizeof( DNS_RR_RECORD ),
+					   ( void ** ) &pDNSRRRecord );
+		BAIL_ON_ERROR( dwError );
+
+		memcpy( &pDNSRRRecord->RRHeader, pRRHeader,
+			sizeof( DNS_RR_HEADER ) );
+		pDNSRRRecord->pRData = pRRData;
+
+		*( ppDNSPRRRRecords + i ) = pDNSRRRecord;
+	}
+
+	*pppDNSPRRRRecords = ppDNSPRRRRecords;
+
+	return dwError;
+
+      error:
+
+
+	return dwError;
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static int32 DNSUpdateUnmarshallUpdateSection( HANDLE hReceiveBuffer,
+				  int16 wUpdates,
+				  DNS_RR_RECORD * **pppDNSUpdateRRRecords )
+{
+	int32 dwError = 0;
+	int32 i = 0;
+	DNS_RR_RECORD *pDNSRRRecord = NULL;
+	DNS_RR_RECORD **ppDNSUpdateRRRecords = NULL;
+	DNS_RR_HEADER RRHeader = { 0 };
+	DNS_RR_HEADER *pRRHeader = &RRHeader;
+	uint8 *pRRData = NULL;
+	int32 dwRead = 0;
+
+	dwError = DNSAllocateMemory( wUpdates * sizeof( DNS_RR_RECORD * ),
+				     ( void ** ) &ppDNSUpdateRRRecords );
+	BAIL_ON_ERROR( dwError );
+
+	for ( i = 0; i < wUpdates; i++ ) {
+
+		memset( pRRHeader, 0, sizeof( DNS_RR_HEADER ) );
+		dwError = DNSUnmarshallRRHeader( hReceiveBuffer, pRRHeader );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSUnmarshallRData( hReceiveBuffer,
+					    pRRHeader->wRDataSize, &pRRData,
+					    &dwRead );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSAllocateMemory( sizeof( DNS_RR_RECORD ),
+					   ( void ** ) &pDNSRRRecord );
+		BAIL_ON_ERROR( dwError );
+
+		memcpy( &pDNSRRRecord->RRHeader, pRRHeader,
+			sizeof( DNS_RR_HEADER ) );
+		pDNSRRRecord->pRData = pRRData;
+
+		*( ppDNSUpdateRRRecords + i ) = pDNSRRRecord;
+	}
+
+	*pppDNSUpdateRRRecords = ppDNSUpdateRRRecords;
+
+	return dwError;
+
+      error:
+
+	return dwError;
+
+}
+
+/*********************************************************************
+*********************************************************************/
+
+static int32 DNSUpdateUnmarshallZoneSection( HANDLE hReceiveBuffer,
+				int16 wZones,
+				DNS_ZONE_RECORD * **pppDNSZoneRecords )
+{
+	int32 dwError = 0;
+	int32 i = 0;
+	int32 dwRead = 0;
+	DNS_ZONE_RECORD *pDNSZoneRecord = NULL;
+	DNS_ZONE_RECORD **ppDNSZoneRecords = NULL;
+	int16 wnZoneClass = 0;
+	int16 wnZoneType = 0;
+
+
+	dwError = DNSAllocateMemory( wZones * sizeof( DNS_ZONE_RECORD * ),
+				     ( void ** ) &ppDNSZoneRecords );
+	BAIL_ON_ERROR( dwError );
+
+	for ( i = 0; i < wZones; i++ ) {
+
+		dwError =
+			DNSAllocateMemory( sizeof( DNS_ZONE_RECORD ),
+					   ( void ** ) &pDNSZoneRecord );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSUnmarshallDomainName( hReceiveBuffer,
+						 &pDNSZoneRecord->
+						 pDomainName );
+		BAIL_ON_ERROR( dwError );
+
+		dwError =
+			DNSUnmarshallBuffer( hReceiveBuffer,
+					     ( uint8 * ) & wnZoneType,
+					     ( int32 ) sizeof( int16 ),
+					     &dwRead );
+		BAIL_ON_ERROR( dwError );
+		pDNSZoneRecord->wZoneType = ntohs( wnZoneType );
+
+		dwError =
+			DNSUnmarshallBuffer( hReceiveBuffer,
+					     ( uint8 * ) & wnZoneClass,
+					     ( int32 ) sizeof( int16 ),
+					     &dwRead );
+		BAIL_ON_ERROR( dwError );
+		pDNSZoneRecord->wZoneClass = ntohs( wnZoneClass );
+
+		*( ppDNSZoneRecords + i ) = pDNSZoneRecord;
+	}
+
+	*pppDNSZoneRecords = ppDNSZoneRecords;
+	return dwError;
+
+      error:
+
+	return dwError;
+}
+
+
+/*********************************************************************
+*********************************************************************/
+
+int32 DNSUpdateReceiveUpdateResponse( HANDLE hDNSHandle,
+				DNS_UPDATE_RESPONSE ** ppDNSResponse )
+{
+	DNS_UPDATE_RESPONSE *pDNSResponse = NULL;
+	int32 dwError = 0;
+	int16 wnIdentification, wIdentification = 0;
+	int16 wnParameter, wParameter = 0;
+	int16 wnZones, wZones = 0;
+	int16 wnPRs, wPRs = 0;
+	int16 wnAdditionals, wAdditionals = 0;
+	int16 wnUpdates, wUpdates = 0;
+	int32 dwRead = 0;
+	DNS_RR_RECORD **ppDNSPRRecords = NULL;
+	DNS_RR_RECORD **ppDNSAdditionalRecords = NULL;
+	DNS_RR_RECORD **ppDNSUpdateRecords = NULL;
+	DNS_ZONE_RECORD **ppDNSZoneRecords = NULL;
+	HANDLE hRecvBuffer = ( HANDLE ) NULL;
+
+	dwError = DNSCreateReceiveBuffer( &hRecvBuffer );
+	BAIL_ON_ERROR( dwError );
+
+	dwError = DNSReceiveBufferContext( hDNSHandle, hRecvBuffer, &dwRead );
+	BAIL_ON_ERROR( dwError );
+
+#if 0
+	dwError = DNSDumpRecvBufferContext( hRecvBuffer );
+	BAIL_ON_ERROR( dwError );
+#endif
+
+	dwError =
+		DNSUnmarshallBuffer( hRecvBuffer,
+				     ( uint8 * ) & wnIdentification,
+				     sizeof( int16 ), &dwRead );
+	BAIL_ON_ERROR( dwError );
+	wIdentification = ntohs( wnIdentification );
+
+	dwError =
+		DNSUnmarshallBuffer( hRecvBuffer, ( uint8 * ) & wnParameter,
+				     sizeof( int16 ), &dwRead );
+	BAIL_ON_ERROR( dwError );
+	wParameter = ntohs( wnParameter );
+
+
+	dwError =
+		DNSUnmarshallBuffer( hRecvBuffer, ( uint8 * ) & wnZones,
+				     sizeof( int16 ), &dwRead );
+	BAIL_ON_ERROR( dwError );
+	wZones = ntohs( wnZones );
+
+
+	dwError =
+		DNSUnmarshallBuffer( hRecvBuffer, ( uint8 * ) & wnPRs,
+				     sizeof( int16 ), &dwRead );
+	BAIL_ON_ERROR( dwError );
+	wPRs = ntohs( wnPRs );
+
+
+	dwError =
+		DNSUnmarshallBuffer( hRecvBuffer, ( uint8 * ) & wnUpdates,
+				     sizeof( int16 ), &dwRead );
+	BAIL_ON_ERROR( dwError );
+	wUpdates = ntohs( wnUpdates );
+
+	dwError =
+		DNSUnmarshallBuffer( hRecvBuffer, ( uint8 * ) & wnAdditionals,
+				     sizeof( int16 ), &dwRead );
+	BAIL_ON_ERROR( dwError );
+	wAdditionals = ntohs( wnAdditionals );
+
+
+	if ( wZones ) {
+		dwError =
+			DNSUpdateUnmarshallZoneSection( hRecvBuffer, wZones,
+							&ppDNSZoneRecords );
+		BAIL_ON_ERROR( dwError );
+	}
+
+	if ( wPRs ) {
+		dwError =
+			DNSUpdateUnmarshallPRSection( hRecvBuffer, wPRs,
+						      &ppDNSPRRecords );
+		BAIL_ON_ERROR( dwError );
+	}
+
+	if ( wUpdates ) {
+		dwError =
+			DNSUpdateUnmarshallUpdateSection( hRecvBuffer,
+							  wUpdates,
+							  &ppDNSUpdateRecords );
+		BAIL_ON_ERROR( dwError );
+	}
+
+	if ( wAdditionals ) {
+		dwError =
+			DNSUpdateUnmarshallAdditionalSection( hRecvBuffer,
+							      wAdditionals,
+							      &ppDNSAdditionalRecords );
+		BAIL_ON_ERROR( dwError );
+	}
+
+	dwError = DNSUpdateAllocateResponse( &pDNSResponse );
+	BAIL_ON_ERROR( dwError );
+
+	pDNSResponse->wIdentification = wIdentification;
+	pDNSResponse->wParameter = wParameter;
+	pDNSResponse->wZones = wZones;
+	pDNSResponse->wPRs = wPRs;
+	pDNSResponse->wUpdates = wUpdates;
+	pDNSResponse->wAdditionals = wAdditionals;
+
+	pDNSResponse->ppZoneRRSet = ppDNSZoneRecords;
+	pDNSResponse->ppPRRRSet = ppDNSPRRecords;
+	pDNSResponse->ppUpdateRRSet = ppDNSUpdateRecords;
+	pDNSResponse->ppAdditionalRRSet = ppDNSAdditionalRecords;
+
+	*ppDNSResponse = pDNSResponse;
+
+
+      error:
+
+	return dwError;
+}
+