fix for enumerate domain users (bug spotted by sean matthews).

also needed to use start index properly and generate next index.

both client and server code need to recognise error code 0x105
when there's not enough room to store all the users in one call.

sort this out another time.

source/rpc_server/srv_samr.c

@@ -73,7 +73,10 @@ static BOOL get_sampwd_entries(SAM_USER_INFO_21 *pw_buf,
 			/* skip the requested number of entries.
 			   not very efficient, but hey...
 			 */
-			start_idx--;
+			if (acb_mask == 0 || IS_BITS_SET_SOME(pwd->acct_ctrl, acb_mask))
+			{
+				start_idx--;
+			}
 			continue;
 		}
 
@@ -344,11 +347,12 @@ static void samr_reply_enum_dom_users(SAMR_Q_ENUM_DOM_USERS *q_u,
 	DEBUG(5,("samr_reply_enum_dom_users: %d\n", __LINE__));
 
 	become_root(True);
-	get_sampwd_entries(pass, 0, &total_entries, &num_entries, MAX_SAM_ENTRIES, q_u->acb_mask);
+	get_sampwd_entries(pass, q_u->start_idx, &total_entries, &num_entries,
+	                   MAX_SAM_ENTRIES, q_u->acb_mask);
 	unbecome_root(True);
 
 	make_samr_r_enum_dom_users(&r_e, 
-	                           0x00000000, num_entries,
+	                           q_u->start_idx + num_entries, num_entries,
 	                           pass, r_e.status);
 
 	/* store the response in the SMB stream */