/* Unix SMB/CIFS implementation. answer node status 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 "lib/socket/socket.h" #include "librpc/gen_ndr/ndr_nbt.h" /* send a name status reply */ static void nbtd_node_status_reply(struct nbt_name_socket *nbtsock, struct nbt_name_packet *request_packet, struct socket_address *src, struct nbt_name *name, struct nbtd_interface *iface) { struct nbt_name_packet *packet; uint32_t name_count; struct nbtd_iface_name *iname; struct nbtd_server *nbtsrv = iface->nbtsrv; /* work out how many names to send */ name_count = 0; for (iname=iface->names;iname;iname=iname->next) { if ((iname->nb_flags & NBT_NM_ACTIVE) && strcmp(iname->name.name, "*") != 0) { name_count++; } } packet = talloc_zero(nbtsock, struct nbt_name_packet); if (packet == NULL) return; packet->name_trn_id = request_packet->name_trn_id; packet->ancount = 1; packet->operation = NBT_OPCODE_QUERY | NBT_FLAG_REPLY | NBT_FLAG_AUTHORITIVE; packet->answers = talloc_array(packet, struct nbt_res_rec, 1); if (packet->answers == NULL) goto failed; packet->answers[0].name = *name; packet->answers[0].rr_type = NBT_QTYPE_STATUS; packet->answers[0].rr_class = NBT_QCLASS_IP; packet->answers[0].ttl = 0; packet->answers[0].rdata.status.num_names = name_count; packet->answers[0].rdata.status.names = talloc_array(packet->answers, struct nbt_status_name, name_count); if (packet->answers[0].rdata.status.names == NULL) goto failed; name_count = 0; for (iname=iface->names;iname;iname=iname->next) { if ((iname->nb_flags & NBT_NM_ACTIVE) && strcmp(iname->name.name, "*") != 0) { struct nbt_status_name *n = &packet->answers[0].rdata.status.names[name_count]; n->name = talloc_asprintf(packet->answers, "%-15s", iname->name.name); if (n->name == NULL) goto failed; n->type = iname->name.type; n->nb_flags = iname->nb_flags; name_count++; } } /* we deliberately don't fill in the statistics structure as it could lead to giving attackers too much information */ ZERO_STRUCT(packet->answers[0].rdata.status.statistics); DEBUG(7,("Sending node status reply for %s to %s:%d\n", nbt_name_string(packet, name), src->addr, src->port)); nbtsrv->stats.total_sent++; nbt_name_reply_send(nbtsock, src, packet); failed: talloc_free(packet); } /* answer a node status query */ void nbtd_query_status(struct nbt_name_socket *nbtsock, struct nbt_name_packet *packet, struct socket_address *src) { struct nbt_name *name; struct nbtd_iface_name *iname; struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data, struct nbtd_interface); NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1); NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_type == NBT_QTYPE_STATUS); 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, NBT_NM_ACTIVE); if (iname == NULL) { DEBUG(7,("Node status query for %s from %s - not found on %s\n", nbt_name_string(packet, name), src->addr, iface->ip_address)); return; } nbtd_node_status_reply(nbtsock, packet, src, &iname->name, iface); }