Ticket 549 - DNA plugin no longer reports additional info when range is depleted

When the DNA plug-in was modified to allocate range values at the
bepreop phase, it stopped returning detailed error strings to the
client when the range was depleted.

This patch allows our bepreop functions to fill in the error string
that the caller can return to the client.

ldap/servers/plugins/dna/dna.c

@@ -2759,7 +2759,7 @@ dna_create_valcheck_filter(struct configEntry *config_entry, PRUint64 value, cha
 /* This function is called at BEPREOP timing to add uid/gidNumber 
  * if modtype is missing */
 static int
-_dna_pre_op_add(Slapi_PBlock *pb, Slapi_Entry *e)
+_dna_pre_op_add(Slapi_PBlock *pb, Slapi_Entry *e, char **errstr)
 {
     int ret = 0;
     PRCList *list = NULL;
@@ -2886,6 +2886,10 @@ _dna_pre_op_add(Slapi_PBlock *pb, Slapi_Entry *e)
                         if (LDAP_SUCCESS != ret) {
                             slapi_log_error(SLAPI_LOG_FATAL, DNA_PLUGIN_SUBSYSTEM,
                                             "dna_pre_op: no more values available!!\n");
+                            /* Set an error string to be returned to the client. */
+                            *errstr = slapi_ch_smprintf("Allocation of a new value for range"
+                                               " %s failed! Unable to proceed.",
+                                               config_entry->dn);
                             slapi_unlock_mutex(config_entry->lock);
                             break;
                         }
@@ -2895,6 +2899,10 @@ _dna_pre_op_add(Slapi_PBlock *pb, Slapi_Entry *e)
                         if (LDAP_SUCCESS != ret){
                             slapi_log_error(SLAPI_LOG_FATAL, DNA_PLUGIN_SUBSYSTEM,
                                             "dna_pre_op: failed to allocate a new ID\n");
+                            /* Set an error string to be returned to the client. */
+                            *errstr = slapi_ch_smprintf("Allocation of a new value for range"
+                                               " %s failed! Unable to proceed.",
+                                               config_entry->dn);
                             slapi_unlock_mutex(config_entry->lock);
                             break;
                         }
@@ -2902,6 +2910,10 @@ _dna_pre_op_add(Slapi_PBlock *pb, Slapi_Entry *e)
                         /* dna_first_free_value() failed for some unknown reason */
                         slapi_log_error(SLAPI_LOG_FATAL, DNA_PLUGIN_SUBSYSTEM,
                                         "dna_pre_op: failed to allocate a new ID!!\n");
+                        /* Set an error string to be returned to the client. */
+                        *errstr = slapi_ch_smprintf("Allocation of a new value for range"
+                                               " %s failed! Unable to proceed.",
+                                               config_entry->dn);
                         slapi_unlock_mutex(config_entry->lock);
                         break;
                     }
@@ -2943,7 +2955,7 @@ bail:
 /* This function is called at BEPREOP timing to add uid/gidNumber 
  * if modtype is missing */
 static int
-_dna_pre_op_modify(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Mods *smods)
+_dna_pre_op_modify(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Mods *smods, char **errstr)
 {
     int ret = 0;
     PRCList *list = NULL;
@@ -3144,6 +3156,10 @@ _dna_pre_op_modify(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Mods *smods)
                         if (LDAP_SUCCESS != ret) {
                             slapi_log_error(SLAPI_LOG_FATAL, DNA_PLUGIN_SUBSYSTEM,
                                             "dna_pre_op: no more values available!!\n");
+                            /* Set an error string to be returned to the client. */
+                            *errstr = slapi_ch_smprintf("Allocation of a new value for range"
+                                               " %s failed! Unable to proceed.",
+                                               config_entry->dn);
                             slapi_unlock_mutex(config_entry->lock);
                             break;
                         }
@@ -3153,6 +3169,10 @@ _dna_pre_op_modify(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Mods *smods)
                         if (LDAP_SUCCESS != ret){
                             slapi_log_error(SLAPI_LOG_FATAL, DNA_PLUGIN_SUBSYSTEM,
                                             "dna_pre_op: failed to allocate a new ID\n");
+                            /* Set an error string to be returned to the client. */
+                            *errstr = slapi_ch_smprintf("Allocation of a new value for range"
+                                               " %s failed! Unable to proceed.",
+                                               config_entry->dn);
                             slapi_unlock_mutex(config_entry->lock);
                             break;
                         }
@@ -3160,6 +3180,10 @@ _dna_pre_op_modify(Slapi_PBlock *pb, Slapi_Entry *e, Slapi_Mods *smods)
                         /* dna_first_free_value() failed for some unknown reason */
                         slapi_log_error(SLAPI_LOG_FATAL, DNA_PLUGIN_SUBSYSTEM,
                                         "dna_pre_op: failed to allocate a new ID!!\n");
+                        /* Set an error string to be returned to the client. */
+                        *errstr = slapi_ch_smprintf("Allocation of a new value for range"
+                                           " %s failed! Unable to proceed.",
+                                           config_entry->dn);
                         slapi_unlock_mutex(config_entry->lock);
                         break;
                     }
@@ -3287,9 +3311,9 @@ dna_pre_op(Slapi_PBlock * pb, int modtype)
         }
     } else {
         if (LDAP_CHANGETYPE_ADD == modtype) {
-            ret = _dna_pre_op_add(pb, test_e);
+            ret = _dna_pre_op_add(pb, test_e, &errstr);
         } else {
-            if((ret = _dna_pre_op_modify(pb, test_e, smods))){
+            if((ret = _dna_pre_op_modify(pb, test_e, smods, &errstr))){
             	slapi_mods_free(&smods);
             }
         }