/* Unix SMB/CIFS implementation. answer name queries Copyright (C) Andrew Tridgell 2005 This program is free software; you can redistribute it and/or modify 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" #include "lib/util/dlinklist.h" #include "system/network.h" #include "nbt_server/nbt_server.h" #include "nbt_server/wins/winsserver.h" #include "smbd/service_task.h" #include "librpc/gen_ndr/ndr_nbt.h" #include "lib/socket/socket.h" #include "param/param.h" /* answer a name query */ void nbtd_request_query(struct nbt_name_socket *nbtsock, struct nbt_name_packet *packet, struct socket_address *src) { struct nbtd_iface_name *iname; struct nbt_name *name; struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private, struct nbtd_interface); /* see if its a node status query */ if (packet->qdcount == 1 && packet->questions[0].question_type == NBT_QTYPE_STATUS) { nbtd_query_status(nbtsock, packet, src); return; } NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1); NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_type == NBT_QTYPE_NETBIOS); NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_class == NBT_QCLASS_IP); /* see if we have the requested name on this interface */ name = &packet->questions[0].name; iname = nbtd_find_iname(iface, name, 0); if (iname == NULL) { /* don't send negative replies to broadcast queries */ if (packet->operation & NBT_FLAG_BROADCAST) { return; } if (packet->operation & NBT_FLAG_RECURSION_DESIRED) { nbtd_winsserver_request(nbtsock, packet, src); return; } /* otherwise send a negative reply */ nbtd_negative_name_query_reply(nbtsock, packet, src); return; } /* * normally we should forward all queries with the * recursion desired flag to the wins server, but this * breaks are winsclient code, when doing mhomed registrations */ if (!(packet->operation & NBT_FLAG_BROADCAST) && (packet->operation & NBT_FLAG_RECURSION_DESIRED) && (iname->nb_flags & NBT_NM_GROUP) && lp_wins_support(iface->nbtsrv->task->lp_ctx)) { nbtd_winsserver_request(nbtsock, packet, src); return; } /* if the name is not yet active and its a broadcast query then ignore it for now */ if (!(iname->nb_flags & NBT_NM_ACTIVE) && (packet->operation & NBT_FLAG_BROADCAST)) { DEBUG(7,("Query for %s from %s - name not active yet on %s\n", nbt_name_string(packet, name), src->addr, iface->ip_address)); return; } nbtd_name_query_reply(nbtsock, packet, src, &iname->name, iname->ttl, iname->nb_flags, nbtd_address_list(iface, packet)); }