[SCM] Samba Shared Repository - branch master updated

Andrew Bartlett abartlet at samba.org
Mon Jul 19 01:34:18 MDT 2010


The branch, master has been updated
       via  35b1e00... s4: Remove trailing whitespaces
       via  11a44ce... ldb: Mark _DEPRECATED_ ldb_msg_diff() and ldb_msg_canonicalize() functions
       via  31aeb84... s4-dsdb: use ldb_msg_normalize() in ldb_msg_difference()
       via  1e20dbd... s4-test: Use ldb_msg_normalize() in sqlite3 backend
       via  91d9f88... s4-test: Use ldb_msg_normalize() in torture/rpc/dssync.c test
       via  d71b20e... s4-dsdb: use ldb_msg_normalize() in ldbadd-process_file()
       via  2ad7019... s4-dsdb: use ldb_msg_normalize() in source4/lib/ldb/common/ldb.c
       via  86cc914... s4-dsdb: use ldb_msg_normalize() in source4/dsdb/schema/schema_set.c
       via  e5a9469... s4-ldb: Add ldb_msg_normalize() to accept a memory context from client
       via  48574cc... s4-ldb: Use _ldb_msg_add_el() in ldb_msg_add()
       via  3944c81... s4-ldb: Use _ldb_msg_add_el() in ldb_msg_add_empty()
       via  8d523d4... s4-ldb: Add separate function to add empty element into ldb_msg
       via  a95fd4e... s4-ldb: Write more explanatory comment for ldb_msg_add()
       via  8deae13... s4-pyldb: Use ldb_msg_difference() in py_ldb_msg_diff()
       via  148b858... s4-test: Use ldb_msg_difference() in torture/rpc/dssync.c test
       via  fa0db46... s4-tools: use ldb_msg_difference() in ldbedit - modify_record()
       via  fb1c079... s4-dsdb/schema/schema_set.c: fix trailing spaces and comments spelling
       via  a11d3b4... s4-dsdb: use ldb_msg_difference() in source4/dsdb/schema/schema_set.c
       via  65b967a... s4-ldb: Implement ldb_msg_difference() function to accept a memory context from client
      from  c09dcb9... s3-auth: Use talloc hierarchies to properly free auth_ntlmssp_state contexts

http://gitweb.samba.org/?p=samba.git;a=shortlog;h=master


- Log -----------------------------------------------------------------
commit 35b1e00ba330d5f90f121f2af384ff416dd4a62b
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:19:07 2010 +0300

    s4: Remove trailing whitespaces
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 11a44ce6f885de1c1f78c791cbe85a915934ae8a
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:18:49 2010 +0300

    ldb: Mark _DEPRECATED_ ldb_msg_diff() and ldb_msg_canonicalize() functions
    
    They are not quite safe to use (requires caller to steal
    resulting message in own context) and may lead to holding
    memory for too long.
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 31aeb841c9823574cb6f13986f4da34d00bb40a1
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:18:14 2010 +0300

    s4-dsdb: use ldb_msg_normalize() in ldb_msg_difference()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 1e20dbd8127bcecda8e4a656d326b391cc5c8e8d
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:16:38 2010 +0300

    s4-test: Use ldb_msg_normalize() in sqlite3 backend
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 91d9f88d28e58157ca63caeb76ff779321d7bb53
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:13:20 2010 +0300

    s4-test: Use ldb_msg_normalize() in torture/rpc/dssync.c test
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit d71b20e8dc9d8e8366ffb5147c84586f5d71416e
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:03:53 2010 +0300

    s4-dsdb: use ldb_msg_normalize() in ldbadd-process_file()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 2ad701911e2bd5d4cdc5d5db64449f3cc01df3cd
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:01:49 2010 +0300

    s4-dsdb: use ldb_msg_normalize() in source4/lib/ldb/common/ldb.c
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 86cc914717a915808479126a14baa915450b24f6
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:59:40 2010 +0300

    s4-dsdb: use ldb_msg_normalize() in source4/dsdb/schema/schema_set.c
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit e5a9469a88e039b558e13273ae637f874bbb42b3
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:55:42 2010 +0300

    s4-ldb: Add ldb_msg_normalize() to accept a memory context from client
    
    Previos implementation from ldb_msg_canonicalize()
    was moved into this function and now ldb_msg_canonicalize()
    is based on ldb_msg_normalize()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 48574ccc3f46a58940a06b524ff3be3c6da6b104
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:47:41 2010 +0300

    s4-ldb: Use _ldb_msg_add_el() in ldb_msg_add()
    
    Previous implementation was 'leaking' attribute name
    string, that is allocated by ldb_msg_add_empty()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 3944c81d08177e7fa360b1925648686c729e2773
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:46:05 2010 +0300

    s4-ldb: Use _ldb_msg_add_el() in ldb_msg_add_empty()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 8d523d46f5dfcbf5a428fd75b908fe5bd738e62c
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:44:13 2010 +0300

    s4-ldb: Add separate function to add empty element into ldb_msg
    
    It just adds another element, nothing more.
    Caller is responsible to fill-in the added element and
    determine how to handle data allocation contexts.
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit a95fd4ef647ed6d4c81ab862e08e7c42ee2fe0d6
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:41:57 2010 +0300

    s4-ldb: Write more explanatory comment for ldb_msg_add()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 8deae13313b87c0d7efa64e9334c06987ed90ac6
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:40:50 2010 +0300

    s4-pyldb: Use ldb_msg_difference() in py_ldb_msg_diff()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 148b8588bc7864f4771c8dcf21cfdc150b22e701
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:38:09 2010 +0300

    s4-test: Use ldb_msg_difference() in torture/rpc/dssync.c test
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit fa0db46af16080dd3a540072f7ad664c0b9270ca
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:35:07 2010 +0300

    s4-tools: use ldb_msg_difference() in ldbedit - modify_record()
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit fb1c0796c7c533f468b74d55507e9877b93ead72
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:27:30 2010 +0300

    s4-dsdb/schema/schema_set.c: fix trailing spaces and comments spelling
    
    Few comments split on several lines also...
    
    (Sorry Metze, I know you hate reviewing "and this, and that"
    type of patches, but those are just cosmetics)
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit a11d3b4dfbdddb16d3f132ea8fe0175cb7d09444
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 13:26:45 2010 +0300

    s4-dsdb: use ldb_msg_difference() in source4/dsdb/schema/schema_set.c
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

commit 65b967a706bb4ee2da1d4211c31c91d31a81e8f1
Author: Kamen Mazdrashki <kamenim at samba.org>
Date:   Fri Jul 16 14:23:24 2010 +0300

    s4-ldb: Implement ldb_msg_difference() function to accept a memory context from client
    
    Old implementation from ldb_msg_diff() was moved into
    this this function but with changed interface
    so that a memory context may be passed.
    
    ldb_msg_diff() function is now based on ldb_msg_difference(),
    which fixes a hidden leak - internal ldb_msg object
    (returned from ldb_msg_canonicalize) wasn't freed
    and stays attached to ldb_context for the connection lifetime.
    
    Signed-off-by: Andrew Bartlett <abartlet at samba.org>

-----------------------------------------------------------------------

Summary of changes:
 source4/dsdb/schema/schema_set.c          |   89 ++++++-----
 source4/lib/ldb/common/ldb.c              |   12 +-
 source4/lib/ldb/common/ldb_msg.c          |  240 +++++++++++++++++++++--------
 source4/lib/ldb/include/ldb.h             |   55 +++++++-
 source4/lib/ldb/ldb_sqlite3/ldb_sqlite3.c |   17 ++-
 source4/lib/ldb/pyldb.c                   |   12 ++-
 source4/lib/ldb/tools/ldbadd.c            |   18 ++-
 source4/lib/ldb/tools/ldbedit.c           |   34 +++--
 source4/torture/rpc/dssync.c              |   15 ++-
 9 files changed, 355 insertions(+), 137 deletions(-)


Changeset truncated at 500 lines:

diff --git a/source4/dsdb/schema/schema_set.c b/source4/dsdb/schema/schema_set.c
index 5d63670..b8ed7ca 100644
--- a/source4/dsdb/schema/schema_set.c
+++ b/source4/dsdb/schema/schema_set.c
@@ -1,7 +1,7 @@
-/* 
-   Unix SMB/CIFS mplementation.
+/*
+   Unix SMB/CIFS implementation.
    DSDB schema header
-   
+
    Copyright (C) Stefan Metzmacher <metze at samba.org> 2006-2007
    Copyright (C) Andrew Bartlett <abartlet at samba.org> 2006-2008
 
@@ -9,15 +9,15 @@
    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"
@@ -32,7 +32,7 @@
 /*
   override the name to attribute handler function
  */
-const struct ldb_schema_attribute *dsdb_attribute_handler_override(struct ldb_context *ldb, 
+const struct ldb_schema_attribute *dsdb_attribute_handler_override(struct ldb_context *ldb,
 								   void *private_data,
 								   const char *name)
 {
@@ -96,17 +96,20 @@ static int dsdb_schema_set_attributes(struct ldb_context *ldb, struct dsdb_schem
 
 	for (attr = schema->attributes; attr; attr = attr->next) {
 		const char *syntax = attr->syntax->ldb_syntax;
-		
+
 		if (!syntax) {
 			syntax = attr->syntax->ldap_oid;
 		}
 
-		/* Write out a rough approximation of the schema as an @ATTRIBUTES value, for bootstrapping */
+		/*
+		 * Write out a rough approximation of the schema
+		 * as an @ATTRIBUTES value, for bootstrapping
+		 */
 		if (strcmp(syntax, LDB_SYNTAX_INTEGER) == 0) {
 			ret = ldb_msg_add_string(msg, attr->lDAPDisplayName, "INTEGER");
 		} else if (strcmp(syntax, LDB_SYNTAX_DIRECTORY_STRING) == 0) {
 			ret = ldb_msg_add_string(msg, attr->lDAPDisplayName, "CASE_INSENSITIVE");
-		} 
+		}
 		if (ret != LDB_SUCCESS) {
 			break;
 		}
@@ -124,7 +127,10 @@ static int dsdb_schema_set_attributes(struct ldb_context *ldb, struct dsdb_schem
 		return ret;
 	}
 
-	/* Try to avoid churning the attributes too much - we only want to do this if they have changed */
+	/*
+	 * Try to avoid churning the attributes too much,
+	 * we only want to do this if they have changed
+	 */
 	ret = ldb_search(ldb, mem_ctx, &res, msg->dn, LDB_SCOPE_BASE, NULL,
 			 NULL);
 	if (ret == LDB_ERR_NO_SUCH_OBJECT) {
@@ -136,8 +142,12 @@ static int dsdb_schema_set_attributes(struct ldb_context *ldb, struct dsdb_schem
 		ret = LDB_SUCCESS;
 		/* Annoyingly added to our search results */
 		ldb_msg_remove_attr(res->msgs[0], "distinguishedName");
-		
-		mod_msg = ldb_msg_diff(ldb, res->msgs[0], msg);
+
+		ret = ldb_msg_difference(ldb, mem_ctx,
+		                         res->msgs[0], msg, &mod_msg);
+		if (ret != LDB_SUCCESS) {
+			goto op_error;
+		}
 		if (mod_msg->num_elements > 0) {
 			ret = dsdb_replace(ldb, mod_msg, 0);
 		}
@@ -153,7 +163,7 @@ static int dsdb_schema_set_attributes(struct ldb_context *ldb, struct dsdb_schem
 		return ret;
 	}
 
-	/* Now write out the indexs, as found in the schema (if they have changed) */
+	/* Now write out the indexes, as found in the schema (if they have changed) */
 
 	ret = ldb_search(ldb, mem_ctx, &res_idx, msg_idx->dn, LDB_SCOPE_BASE,
 			 NULL, NULL);
@@ -167,7 +177,11 @@ static int dsdb_schema_set_attributes(struct ldb_context *ldb, struct dsdb_schem
 		/* Annoyingly added to our search results */
 		ldb_msg_remove_attr(res_idx->msgs[0], "distinguishedName");
 
-		mod_msg = ldb_msg_diff(ldb, res_idx->msgs[0], msg_idx);
+		ret = ldb_msg_difference(ldb, mem_ctx,
+		                         res_idx->msgs[0], msg_idx, &mod_msg);
+		if (ret != LDB_SUCCESS) {
+			goto op_error;
+		}
 		if (mod_msg->num_elements > 0) {
 			ret = dsdb_replace(ldb, mod_msg, 0);
 		}
@@ -354,17 +368,16 @@ int dsdb_setup_schema_inversion(struct ldb_context *ldb, struct dsdb_schema *sch
 	 * order as an integer in the dsdb_class (for sorting
 	 * objectClass lists efficiently) */
 
-	/* Walk the list of scheam classes */
-	
+	/* Walk the list of schema classes */
+
 	/*  Create a 'total possible superiors' on each class */
 	return LDB_SUCCESS;
 }
 
 /**
- * Attach the schema to an opaque pointer on the ldb, so ldb modules
- * can find it 
+ * Attach the schema to an opaque pointer on the ldb,
+ * so ldb modules can find it
  */
-
 int dsdb_set_schema(struct ldb_context *ldb, struct dsdb_schema *schema)
 {
 	struct dsdb_schema *old_schema;
@@ -461,7 +474,7 @@ int dsdb_set_global_schema(struct ldb_context *ldb)
 	/* Set the new attributes based on the new schema */
 	ret = dsdb_schema_set_attributes(ldb, global_schema, false /* Don't write attributes, it's expensive */);
 	if (ret == LDB_SUCCESS) {
-		/* Keep a reference to this schema, just incase the original copy is replaced */
+		/* Keep a reference to this schema, just in case the original copy is replaced */
 		if (talloc_reference(ldb, global_schema) == NULL) {
 			return ldb_oom(ldb);
 		}
@@ -503,7 +516,10 @@ struct dsdb_schema *dsdb_get_schema(struct ldb_context *ldb, TALLOC_CTX *referen
 
 	if (schema_in->refresh_fn && !schema_in->refresh_in_progress) {
 		if (!talloc_reference(tmp_ctx, schema_in)) {
-			/* ensure that the schema_in->refresh_in_progress remains valid for the right amount of time */
+			/*
+			 * ensure that the schema_in->refresh_in_progress
+			 * remains valid for the right amount of time
+			 */
 			talloc_free(tmp_ctx);
 			return NULL;
 		}
@@ -548,9 +564,11 @@ void dsdb_make_schema_global(struct ldb_context *ldb, struct dsdb_schema *schema
 	dsdb_set_global_schema(ldb);
 }
 
-/* When loading the schema from LDIF files, we don't get the extended DNs. 
-   
-   We need to set these up, so that from the moment we start the provision, the defaultObjectCategory links are set up correctly. 
+/**
+ * When loading the schema from LDIF files, we don't get the extended DNs.
+ *
+ * We need to set these up, so that from the moment we start the provision,
+ * the defaultObjectCategory links are set up correctly.
  */
 int dsdb_schema_fill_extended_dn(struct ldb_context *ldb, struct dsdb_schema *schema)
 {
@@ -575,7 +593,7 @@ int dsdb_schema_fill_extended_dn(struct ldb_context *ldb, struct dsdb_schema *sc
 			talloc_free(dn);
 			return LDB_ERR_CONSTRAINT_VIOLATION;
 		}
-		
+
 		status = GUID_to_ndr_blob(&target_class->objectGUID, dn, &guid);
 		if (!NT_STATUS_IS_OK(status)) {
 			talloc_free(dn);
@@ -589,11 +607,11 @@ int dsdb_schema_fill_extended_dn(struct ldb_context *ldb, struct dsdb_schema *sc
 	return LDB_SUCCESS;
 }
 
-/** 
+/**
  * Add an element to the schema (attribute or class) from an LDB message
  */
-WERROR dsdb_schema_set_el_from_ldb_msg(struct ldb_context *ldb, struct dsdb_schema *schema, 
-				       struct ldb_message *msg) 
+WERROR dsdb_schema_set_el_from_ldb_msg(struct ldb_context *ldb, struct dsdb_schema *schema,
+				       struct ldb_message *msg)
 {
 	if (samdb_find_attribute(ldb, msg,
 				 "objectclass", "attributeSchema") != NULL) {
@@ -649,11 +667,10 @@ WERROR dsdb_set_schema_from_ldif(struct ldb_context *ldb, const char *pf, const
 	}
 	talloc_steal(mem_ctx, ldif);
 
-	msg = ldb_msg_canonicalize(ldb, ldif->msg);
-	if (!msg) {
+	ret = ldb_msg_normalize(ldb, mem_ctx, ldif->msg, &msg);
+	if (ret != LDB_SUCCESS) {
 		goto nomem;
 	}
-	talloc_steal(mem_ctx, msg);
 	talloc_free(ldif);
 
 	prefix_val = ldb_msg_find_ldb_val(msg, "prefixMap");
@@ -675,14 +692,12 @@ WERROR dsdb_set_schema_from_ldif(struct ldb_context *ldb, const char *pf, const
 		goto failed;
 	}
 
-	/*
-	 * load the attribute and class definitions outof df
-	 */
+	/* load the attribute and class definitions out of df */
 	while ((ldif = ldb_ldif_read_string(ldb, &df))) {
 		talloc_steal(mem_ctx, ldif);
 
-		msg = ldb_msg_canonicalize(ldb, ldif->msg);
-		if (!msg) {
+		ret = ldb_msg_normalize(ldb, ldif, ldif->msg, &msg);
+		if (ret != LDB_SUCCESS) {
 			goto nomem;
 		}
 
diff --git a/source4/lib/ldb/common/ldb.c b/source4/lib/ldb/common/ldb.c
index 877f283..3a0ca46 100644
--- a/source4/lib/ldb/common/ldb.c
+++ b/source4/lib/ldb/common/ldb.c
@@ -795,15 +795,17 @@ int ldb_request(struct ldb_context *ldb, struct ldb_request *req)
 		ret = module->ops->search(module, req);
 		break;
 	case LDB_ADD:
-		/* we have to canonicalise here, as so many places
+		/*
+		 * we have to normalize here, as so many places
 		 * in modules and backends assume we don't have two
-		 * elements with the same name */
-		req->op.add.message = ldb_msg_canonicalize(ldb, req->op.add.message);
-		if (!req->op.add.message) {
+		 * elements with the same name
+		 */
+		ret = ldb_msg_normalize(ldb, req, req->op.add.message,
+		                        discard_const(&req->op.add.message));
+		if (ret != LDB_SUCCESS) {
 			ldb_oom(ldb);
 			return LDB_ERR_OPERATIONS_ERROR;
 		}
-		talloc_steal(req, req->op.add.message);
 		FIRST_OP(ldb, add);
 		ret = module->ops->add(module, req);
 		break;
diff --git a/source4/lib/ldb/common/ldb_msg.c b/source4/lib/ldb/common/ldb_msg.c
index 4d0149a..8cf2584 100644
--- a/source4/lib/ldb/common/ldb_msg.c
+++ b/source4/lib/ldb/common/ldb_msg.c
@@ -114,58 +114,94 @@ struct ldb_val ldb_val_dup(void *mem_ctx, const struct ldb_val *v)
 	return v2;
 }
 
-/*
-  add an empty element to a message
-*/
-int ldb_msg_add_empty(	struct ldb_message *msg,
-			const char *attr_name,
-			int flags,
-			struct ldb_message_element **return_el)
+/**
+ * Adds new empty element to msg->elements
+ */
+static int _ldb_msg_add_el(struct ldb_message *msg,
+			   struct ldb_message_element **return_el)
 {
 	struct ldb_message_element *els;
 
-	els = talloc_realloc(msg, msg->elements, 
-			     struct ldb_message_element, msg->num_elements+1);
+	/*
+	 * TODO: Find out a way to assert on input parameters.
+	 * msg and return_el must be valid
+	 */
+
+	els = talloc_realloc(msg, msg->elements,
+			     struct ldb_message_element, msg->num_elements + 1);
 	if (!els) {
 		errno = ENOMEM;
 		return LDB_ERR_OPERATIONS_ERROR;
 	}
 
-	els[msg->num_elements].values = NULL;
-	els[msg->num_elements].num_values = 0;
-	els[msg->num_elements].flags = flags;
-	els[msg->num_elements].name = talloc_strdup(els, attr_name);
-	if (!els[msg->num_elements].name) {
-		errno = ENOMEM;
-		return LDB_ERR_OPERATIONS_ERROR;
-	}
+	ZERO_STRUCT(els[msg->num_elements]);
 
 	msg->elements = els;
 	msg->num_elements++;
 
+	*return_el = &els[msg->num_elements-1];
+
+	return LDB_SUCCESS;
+}
+
+/**
+ * Add an empty element with a given name to a message
+ */
+int ldb_msg_add_empty(struct ldb_message *msg,
+		      const char *attr_name,
+		      int flags,
+		      struct ldb_message_element **return_el)
+{
+	int ret;
+	struct ldb_message_element *el;
+
+	ret = _ldb_msg_add_el(msg, &el);
+	if (ret != LDB_SUCCESS) {
+		return ret;
+	}
+
+	/* initialize newly added element */
+	el->flags = flags;
+	el->name = talloc_strdup(msg->elements, attr_name);
+	if (!el->name) {
+		errno = ENOMEM;
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
+
 	if (return_el) {
-		*return_el = &els[msg->num_elements-1];
+		*return_el = el;
 	}
 
 	return LDB_SUCCESS;
 }
 
-/*
-  add an empty element to a message
-*/
+/**
+ * Adds an element to a message.
+ *
+ * NOTE: Ownership of ldb_message_element fields
+ *       is NOT transferred. Thus, if *el pointer
+ *       is invalidated for some reason, this will
+ *       corrupt *msg contents also
+ */
 int ldb_msg_add(struct ldb_message *msg, 
 		const struct ldb_message_element *el, 
 		int flags)
 {
+	int ret;
+	struct ldb_message_element *el_new;
 	/* We have to copy this, just in case *el is a pointer into
 	 * what ldb_msg_add_empty() is about to realloc() */
 	struct ldb_message_element el_copy = *el;
-	if (ldb_msg_add_empty(msg, el->name, flags, NULL) != LDB_SUCCESS) {
-		return LDB_ERR_OPERATIONS_ERROR;
+
+	ret = _ldb_msg_add_el(msg, &el_new);
+	if (ret != LDB_SUCCESS) {
+		return ret;
 	}
 
-	msg->elements[msg->num_elements-1] = el_copy;
-	msg->elements[msg->num_elements-1].flags = flags;
+	el_new->flags      = flags;
+	el_new->name       = el_copy.name;
+	el_new->num_values = el_copy.num_values;
+	el_new->values     = el_copy.values;
 
 	return LDB_SUCCESS;
 }
@@ -541,36 +577,64 @@ failed:
 }
 
 
-/*
-  canonicalise a message, merging elements of the same name
-*/
+/**
+ * Canonicalize a message, merging elements of the same name
+ */
 struct ldb_message *ldb_msg_canonicalize(struct ldb_context *ldb, 
 					 const struct ldb_message *msg)
 {
+	int ret;
+	struct ldb_message *msg2;
+
+	/*
+	 * Preserve previous behavior and allocate
+	 * *msg2 into *ldb context
+	 */
+	ret = ldb_msg_normalize(ldb, ldb, msg, &msg2);
+	if (ret != LDB_SUCCESS) {
+		return NULL;
+	}
+
+	return msg2;
+}
+
+/**
+ * Canonicalize a message, merging elements of the same name
+ */
+int ldb_msg_normalize(struct ldb_context *ldb,
+		      TALLOC_CTX *mem_ctx,
+		      const struct ldb_message *msg,
+		      struct ldb_message **_msg_out)
+{
 	unsigned int i;
 	struct ldb_message *msg2;
 
-	msg2 = ldb_msg_copy(ldb, msg);
-	if (msg2 == NULL) return NULL;
+	msg2 = ldb_msg_copy(mem_ctx, msg);
+	if (msg2 == NULL) {
+		return LDB_ERR_OPERATIONS_ERROR;
+	}
 
 	ldb_msg_sort_elements(msg2);
 
-	for (i=1;i<msg2->num_elements;i++) {
+	for (i=1; i < msg2->num_elements; i++) {
 		struct ldb_message_element *el1 = &msg2->elements[i-1];
 		struct ldb_message_element *el2 = &msg2->elements[i];
+
 		if (ldb_msg_element_compare_name(el1, el2) == 0) {
-			el1->values = talloc_realloc(msg2->elements, el1->values, struct ldb_val, 
-						       el1->num_values + el2->num_values);
+			el1->values = talloc_realloc(msg2->elements,
+			                             el1->values, struct ldb_val,
+			                             el1->num_values + el2->num_values);
 			if (el1->num_values + el2->num_values > 0 && el1->values == NULL) {
-				return NULL;
+				talloc_free(msg2);
+				return LDB_ERR_OPERATIONS_ERROR;
 			}
 			memcpy(el1->values + el1->num_values,
 			       el2->values,
 			       sizeof(struct ldb_val) * el2->num_values);
 			el1->num_values += el2->num_values;
 			talloc_free(discard_const_p(char, el2->name));
-			if (i+1<msg2->num_elements) {
-				memmove(el2, el2+1, sizeof(struct ldb_message_element) * 
+			if ((i+1) < msg2->num_elements) {
+				memmove(el2, el2+1, sizeof(struct ldb_message_element) *
 					(msg2->num_elements - (i+1)));
 			}
 			msg2->num_elements--;
@@ -578,39 +642,81 @@ struct ldb_message *ldb_msg_canonicalize(struct ldb_context *ldb,
 		}
 	}
 
-	return msg2;
+	*_msg_out = msg2;
+	return LDB_SUCCESS;
 }
 
 
-/*
-  return a ldb_message representing the differences between msg1 and msg2. If you
-  then use this in a ldb_modify() call it can be used to save edits to a message
-*/
+/**
+ * return a ldb_message representing the differences between msg1 and msg2.
+ * If you then use this in a ldb_modify() call,
+ * it can be used to save edits to a message
+ */
 struct ldb_message *ldb_msg_diff(struct ldb_context *ldb, 
 				 struct ldb_message *msg1,
 				 struct ldb_message *msg2)
 {
+	int ldb_ret;
 	struct ldb_message *mod;
-	struct ldb_message_element *el;
+
+	ldb_ret = ldb_msg_difference(ldb, ldb, msg1, msg2, &mod);
+	if (ldb_ret != LDB_SUCCESS) {
+		return NULL;
+	}
+
+	return mod;
+}
+
+/**
+ * return a ldb_message representing the differences between msg1 and msg2.
+ * If you then use this in a ldb_modify() call it can be used to save edits to a message
+ *
+ * Result message is constructed as follows:
+ * - LDB_FLAG_MOD_ADD     - elements found only in msg2
+ * - LDB_FLAG_MOD_REPLACE - elements in msg2 that have different value in msg1
+ *                          Value for msg2 element is used


-- 
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