Resolves: bug 471068

Bug Description: winsync doesn't recognize some changes
Reviewed by: nkinder (Thanks!)
Fix Description: Before sending updates to AD, first check to see if the updates still apply.  For modify/add operations, check to make sure the value to add doesn't exist.  If it does, remove it from the list of values in the mod.  If all values are removed, then just skip the modify/add op altogether.  For modify/del ops, check to see if the attribute exists.  If not, just skip the op.  If it does exist, check to see if the values exist, and remove the values from the mod/del op that do not exist anymore.  If all values have been removed, just skip the mod/del op.
I added a new slapi function - slapi_mod_init_valueset_byval - which will init a Slapi_Mod and init the list of values using a valueset.  Fortunately there was already a function for converting a Slapi_Value** to a berval**.
I also fixed a few compiler warnings.
Platforms tested: RHEL5
Flag Day: no
Doc impact: yes - add new function to slapi docs

ldap/servers/plugins/replication/windows_protocol_util.c

@@ -62,7 +62,7 @@ int ruv_private_new( RUV **ruv, RUV *clone );
 static Slapi_Entry* windows_entry_already_exists(Slapi_Entry *e);
 static void extract_guid_from_entry_bv(Slapi_Entry *e, const struct berval **bv);
 #endif
-static void windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods, LDAPMod ***returned_mods, int is_user, char** password);
+static void windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods, LDAPMod ***returned_mods, int is_user, char** password, const Slapi_Entry *ad_entry);
 static int is_subject_of_agreement_local(const Slapi_Entry *local_entry,const Repl_Agmt *ra);
 static int windows_create_remote_entry(Private_Repl_Protocol *prp,Slapi_Entry *original_entry, Slapi_DN *remote_sdn, Slapi_Entry **remote_entry, char** password);
 static int windows_get_local_entry(const Slapi_DN* local_dn,Slapi_Entry **local_entry);
@@ -1233,7 +1233,8 @@ windows_replay_update(Private_Repl_Protocol *prp, slapi_operation_parameters *op
 				LDAPMod **mapped_mods = NULL;
 				char *newrdn = NULL;
 
-				windows_map_mods_for_replay(prp,op->p.p_modify.modify_mods, &mapped_mods, is_user, &password);
+				windows_map_mods_for_replay(prp,op->p.p_modify.modify_mods, &mapped_mods, is_user, &password,
+											windows_private_get_raw_entry(prp->agmt));
 				if (is_user) {
 					winsync_plugin_call_pre_ad_mod_user_mods_cb(prp->agmt,
 																windows_private_get_raw_entry(prp->agmt),
@@ -1731,6 +1732,104 @@ windows_delete_local_entry(Slapi_DN *sdn){
 	return return_value;
 }
 
+/*
+  Before we send the modify to AD, we need to check to see if the mod still
+  applies - the entry in AD may have been modified, and those changes not sync'd
+  back to the DS, since the way winsync currently works is that it polls periodically
+  using DirSync for changes in AD - note that this does not guarantee that the mod
+  will apply cleanly, since there is still a small window of time between the time
+  we read the entry from AD and the time the mod op is sent, but doing this check
+  here should substantially reduce the chances of these types of out-of-sync problems
+
+  If we do find a mod that does not apply cleanly, we just discard it and log an
+  error message to that effect.
+*/
+static int
+mod_already_made(Private_Repl_Protocol *prp, Slapi_Mod *smod, const Slapi_Entry *ad_entry)
+{
+	int retval = 0;
+	int op = 0;
+	const char *type = NULL;
+
+	if (!slapi_mod_isvalid(smod)) { /* bogus */
+		slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
+						"%s: mod_already_made: "
+						"modify operation is null - skipping.\n",
+						agmt_get_long_name(prp->agmt));
+		return 1;
+	}
+
+	op = slapi_mod_get_operation(smod);
+	type = slapi_mod_get_type(smod);
+	if (SLAPI_IS_MOD_ADD(op)) { /* make sure value is not there */
+		struct berval *bv = NULL;
+		for (bv = slapi_mod_get_first_value(smod);
+			 bv; bv = slapi_mod_get_next_value(smod)) {
+			Slapi_Value *sv = slapi_value_new();
+			slapi_value_init_berval(sv, bv); /* copies bv_val */
+			if (slapi_entry_attr_has_syntax_value(ad_entry, type, sv)) {
+				slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
+								"%s: mod_already_made: "
+								"remote entry attr [%s] already has value [%s] - will not send.\n",
+								agmt_get_long_name(prp->agmt), type,
+								slapi_value_get_string(sv));
+				slapi_mod_remove_value(smod); /* removes the value at the current iterator pos */
+			}
+			slapi_value_free(&sv);
+		}
+		/* if all values were removed, no need to send the mod */
+		if (slapi_mod_get_num_values(smod) == 0) {
+			slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
+							"%s: mod_already_made: "
+							"remote entry attr [%s] had all mod values removed - will not send.\n",
+							agmt_get_long_name(prp->agmt), type);
+			retval = 1;
+		}
+	} else if (SLAPI_IS_MOD_DELETE(op)) { /* make sure value or attr is there */
+		Slapi_Attr *attr = NULL;
+
+		/* if attribute does not exist, no need to send the delete */
+		if (slapi_entry_attr_find(ad_entry, type, &attr) || !attr) {
+			slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
+							"%s: mod_already_made: "
+							"remote entry attr [%s] already deleted - will not send.\n",
+							agmt_get_long_name(prp->agmt), type);
+			retval = 1;
+		} else if (slapi_mod_get_num_values(smod) > 0) {
+			/* if attr exists, remove mods that have already been applied */
+			struct berval *bv = NULL;
+			for (bv = slapi_mod_get_first_value(smod);
+				 bv; bv = slapi_mod_get_next_value(smod)) {
+				Slapi_Value *sv = slapi_value_new();
+				slapi_value_init_berval(sv, bv); /* copies bv_val */
+				if (!slapi_entry_attr_has_syntax_value(ad_entry, type, sv)) {
+					slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
+									"%s: mod_already_made: "
+									"remote entry attr [%s] already deleted value [%s] - will not send.\n",
+									agmt_get_long_name(prp->agmt), type,
+									slapi_value_get_string(sv));
+					slapi_mod_remove_value(smod); /* removes the value at the current iterator pos */
+				}
+				slapi_value_free(&sv);
+			}
+			/* if all values were removed, no need to send the mod */
+			if (slapi_mod_get_num_values(smod) == 0) {
+				slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
+								"%s: mod_already_made: "
+								"remote entry attr [%s] had all mod values removed - will not send.\n",
+								agmt_get_long_name(prp->agmt), type);
+				retval = 1;
+			}
+		} /* else if no values specified, this means delete the attribute */
+	} else { /* allow this mod */
+		slapi_log_error(SLAPI_LOG_REPL, repl_plugin_name,
+						"%s: mod_already_made: "
+						"skipping mod op [%d]\n",
+						agmt_get_long_name(prp->agmt), op);
+	}
+
+	return retval;
+}
 
 static int
 windows_check_mods_for_rdn_change(Private_Repl_Protocol *prp, LDAPMod **original_mods, 
@@ -1905,12 +2004,13 @@ done:
 
 
 static void 
-windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods, LDAPMod ***returned_mods, int is_user, char** password) 
+windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods, LDAPMod ***returned_mods, int is_user, char** password, const Slapi_Entry *ad_entry) 
 {
 	Slapi_Mods smods = {0};
 	Slapi_Mods mapped_smods = {0};
 	LDAPMod *mod = NULL;
 	int is_nt4 = windows_private_get_isnt4(prp->agmt);
+	Slapi_Mod *mysmod = NULL;
 
 	LDAPDebug( LDAP_DEBUG_TRACE, "=> windows_map_mods_for_replay\n", 0, 0, 0 );
 
@@ -1945,8 +2045,9 @@ windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods,
 				}
 			}
 
-			/* copy over the mod */
-			slapi_mods_add_modbvps(&mapped_smods,mod->mod_op,attr_type,mod->mod_bvalues);
+			/* create the new smod to add to the mapped_smods */
+			mysmod = slapi_mod_new();
+			slapi_mod_init_byval(mysmod, mod); /* copy contents */
 		} else 
 		{
 			char *mapped_type = NULL;
@@ -1967,7 +2068,8 @@ windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods,
 					map_dn_values(prp,vs,&mapped_values, 1 /* to windows */,0);
 					if (mapped_values) 
 					{
-						slapi_mods_add_mod_values(&mapped_smods,mod->mod_op,mapped_type,valueset_get_valuearray(mapped_values));
+						mysmod = slapi_mod_new();
+						slapi_mod_init_valueset_byval(mysmod, mod->mod_op, mapped_type, mapped_values);
 						slapi_valueset_free(mapped_values);
 						mapped_values = NULL;
 					} else 
@@ -1975,7 +2077,10 @@ windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods,
 						/* this might be a del: mod, in which case there are no values */
 						if (mod->mod_op & LDAP_MOD_DELETE)
 						{
-							slapi_mods_add_mod_values(&mapped_smods, LDAP_MOD_DELETE, mapped_type, NULL);
+							mysmod = slapi_mod_new();
+							slapi_mod_init(mysmod, 0);
+							slapi_mod_set_operation(mysmod, LDAP_MOD_DELETE|LDAP_MOD_BVALUES);
+							slapi_mod_set_type(mysmod, mapped_type);
 						}
 					}
 					slapi_mod_done(&smod);
@@ -2004,7 +2109,10 @@ windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods,
 						slapi_mod_done(&smod);
 					}
 
-					slapi_mods_add_modbvps(&mapped_smods,mod->mod_op,mapped_type,mod->mod_bvalues);
+					/* create the new smod to add to the mapped_smods */
+					mysmod = slapi_mod_new();
+					slapi_mod_init_byval(mysmod, mod); /* copy contents */
+					slapi_mod_set_type(mysmod, mapped_type);
 				}
 				slapi_ch_free_string(&mapped_type);
 			} else 
@@ -2050,6 +2158,13 @@ windows_map_mods_for_replay(Private_Repl_Protocol *prp,LDAPMod **original_mods,
 			}
 		}
 		/* Otherwise we do not copy this mod at all */
+		if (mysmod && !mod_already_made(prp, mysmod, ad_entry)) { /* make sure this mod is still valid to send */
+			slapi_mods_add_ldapmod(&mapped_smods, slapi_mod_get_ldapmod_passout(mysmod));
+		}
+		if (mysmod) {
+			slapi_mod_free(&mysmod);
+		}
+			
 		mod = slapi_mods_get_next_mod(&smods);
 	}
 	slapi_mods_done (&smods);

ldap/servers/slapd/add.c

@@ -745,7 +745,7 @@ static int check_rdn_for_created_attrs(Slapi_Entry *e)
     char *type[] = {SLAPI_ATTR_UNIQUEID, "modifytimestamp", "createtimestamp",
                    "creatorsname", "modifiersname", 0};
 
-    if (rdn = slapi_rdn_new()) {
+    if ((rdn = slapi_rdn_new())) {
         slapi_rdn_init_dn(rdn, slapi_entry_get_dn_const(e));
 
         for (i = 0; type[i] != NULL; i++) {

ldap/servers/slapd/back-ldbm/dblayer.c

@@ -3884,7 +3884,7 @@ unsigned long db_strtoul(const char *str, int *err)
      * are silently converted to the equivalent unsigned long int value.
      */
     /* We don't want to make it happen. */
-    for (p = str; p && *p && (*p == ' ' || *p == '\t'); p++) ;
+    for (p = (char *)str; p && *p && (*p == ' ' || *p == '\t'); p++) ;
     if ('-' == *p) {
         if (err) *err = ERANGE;
         return val;

ldap/servers/slapd/modutil.c

@@ -594,6 +594,21 @@ slapi_mod_init_byval (Slapi_Mod *smod, const LDAPMod *mod)
 	}
 }
 
+void
+slapi_mod_init_valueset_byval(Slapi_Mod *smod, int op, const char *type, const Slapi_ValueSet *svs)
+{
+	PR_ASSERT(smod!=NULL);
+	slapi_mod_init(smod, 0);
+	slapi_mod_set_operation (smod, op);
+	slapi_mod_set_type (smod, type);
+	if (svs!=NULL) {
+		Slapi_Value **svary = valueset_get_valuearray(svs);
+		valuearray_get_bervalarray(svary, &smod->mod->mod_bvalues);
+		smod->num_values = slapi_valueset_count(svs);
+		smod->num_elements = smod->num_values + 1;
+	}
+}
+
 void
 slapi_mod_free (Slapi_Mod **smod)
 {
@@ -750,15 +765,16 @@ slapi_mod_isvalid (const Slapi_Mod *mod)
 	if (mod == NULL || mod->mod == NULL)
 		return 0;
 
-	op = mod->mod->mod_op && ~LDAP_MOD_BVALUES;
+	op = mod->mod->mod_op;
 
-	if (op != LDAP_MOD_ADD && op != LDAP_MOD_DELETE && op != LDAP_MOD_REPLACE)
+	if (!SLAPI_IS_MOD_ADD(op) && !SLAPI_IS_MOD_DELETE(op) && !SLAPI_IS_MOD_REPLACE(op))
 		return 0;
 
 	if (mod->mod->mod_type == NULL)
 		return 0;
 
-	if (op != LDAP_MOD_DELETE && mod->num_values == 0)
+	/* add op must have at least 1 value */
+	if (SLAPI_IS_MOD_ADD(op) && (mod->num_values == 0))
 		return 0;
 
 	return 1;

ldap/servers/slapd/slapi-plugin.h

@@ -573,6 +573,8 @@ void slapi_mod_init(Slapi_Mod *smod, int initCount);
 void slapi_mod_init_byval(Slapi_Mod *smod, const LDAPMod *mod);
 void slapi_mod_init_byref(Slapi_Mod *smod, LDAPMod *mod);
 void slapi_mod_init_passin(Slapi_Mod *smod, LDAPMod *mod);
+/* init a mod and set the mod values to be a copy of the given valueset */
+void slapi_mod_init_valueset_byval(Slapi_Mod *smod, int op, const char *type, const Slapi_ValueSet *svs);
 void slapi_mod_add_value(Slapi_Mod *smod, const struct berval *val);
 void slapi_mod_remove_value(Slapi_Mod *smod);
 struct berval *slapi_mod_get_first_value(Slapi_Mod *smod);

ldap/servers/slapd/util.c

@@ -207,7 +207,6 @@ escape_filter_value(const char* str, int len, char buf[BUFSIZ])
 void
 strcpy_unescape_value( char *d, const char *s )
 {
-    char *head = d;
     int gotesc = 0;
     const char *end = s + strlen(s);
     for ( ; *s; s++ )