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https://github.com/samba-team/samba.git
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7b8f58c37c
as a human readable string. The format is designed to be able to be used as the DN for the WINS database as well, while coping with arbitrary bytes in the name (except nul bytes) (This used to be commit aac3090e3504ba07124a9d480322a98efb97175e)
124 lines
4.0 KiB
C
124 lines
4.0 KiB
C
/*
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Unix SMB/CIFS implementation.
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answer node status queries
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Copyright (C) Andrew Tridgell 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#include "dlinklist.h"
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#include "system/network.h"
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#include "nbt_server/nbt_server.h"
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/*
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send a name status reply
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*/
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static void nbtd_node_status_reply(struct nbt_name_socket *nbtsock,
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struct nbt_name_packet *request_packet,
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const char *src_address, int src_port,
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struct nbt_name *name,
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struct nbtd_interface *iface)
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{
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struct nbt_name_packet *packet;
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uint32_t name_count;
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struct nbtd_iface_name *iname;
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/* work out how many names to send */
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name_count = 0;
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for (iname=iface->names;iname;iname=iname->next) {
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if ((iname->nb_flags & NBT_NM_ACTIVE) &&
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strcmp(iname->name.name, "*") != 0) {
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name_count++;
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}
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}
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packet = talloc_zero(nbtsock, struct nbt_name_packet);
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if (packet == NULL) return;
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packet->name_trn_id = request_packet->name_trn_id;
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packet->ancount = 1;
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packet->operation = NBT_OPCODE_QUERY | NBT_FLAG_REPLY | NBT_FLAG_AUTHORITIVE;
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packet->answers = talloc_array(packet, struct nbt_res_rec, 1);
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if (packet->answers == NULL) goto failed;
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packet->answers[0].name = *name;
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packet->answers[0].rr_type = NBT_QTYPE_STATUS;
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packet->answers[0].rr_class = NBT_QCLASS_IP;
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packet->answers[0].ttl = 0;
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packet->answers[0].rdata.status.num_names = name_count;
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packet->answers[0].rdata.status.names = talloc_array(packet->answers,
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struct nbt_status_name, name_count);
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if (packet->answers[0].rdata.status.names == NULL) goto failed;
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name_count = 0;
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for (iname=iface->names;iname;iname=iname->next) {
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if ((iname->nb_flags & NBT_NM_ACTIVE) &&
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strcmp(iname->name.name, "*") != 0) {
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struct nbt_status_name *n = &packet->answers[0].rdata.status.names[name_count];
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n->name = talloc_asprintf(packet->answers, "%-15s", iname->name.name);
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if (n->name == NULL) goto failed;
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n->type = iname->name.type;
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n->nb_flags = iname->nb_flags;
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name_count++;
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}
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}
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/* we deliberately don't fill in the statistics structure as
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it could lead to giving attackers too much information */
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ZERO_STRUCT(packet->answers[0].rdata.status.statistics);
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DEBUG(7,("Sending node status reply for %s to %s:%d\n",
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nbt_name_string(packet, name), src_address, src_port));
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nbt_name_reply_send(nbtsock, src_address, src_port, packet);
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failed:
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talloc_free(packet);
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}
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/*
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answer a node status query
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*/
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void nbtd_query_status(struct nbt_name_socket *nbtsock,
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struct nbt_name_packet *packet,
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const char *src_address, int src_port)
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{
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struct nbt_name *name;
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struct nbtd_iface_name *iname;
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struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private,
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struct nbtd_interface);
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NBTD_ASSERT_PACKET(packet, src_address, packet->qdcount == 1);
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NBTD_ASSERT_PACKET(packet, src_address, packet->questions[0].question_type == NBT_QTYPE_STATUS);
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NBTD_ASSERT_PACKET(packet, src_address, packet->questions[0].question_class == NBT_QCLASS_IP);
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/* see if we have the requested name on this interface */
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name = &packet->questions[0].name;
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iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE);
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if (iname == NULL) {
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DEBUG(7,("Node status query for %s from %s - not found on %s\n",
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nbt_name_string(packet, name), src_address, iface->ip_address));
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return;
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}
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nbtd_node_status_reply(nbtsock, packet, src_address, src_port,
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&iname->name, iface);
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}
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