mirror of
https://github.com/samba-team/samba.git
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77cdd7c0ff
bind twice on each interface, once using the broadcast address and
once using the specific IP. We then only listen on the wildcard
address if we don't have "bind interface only" set. This also happens
to simplify the code that finds the right interface for an incoming
request.
(This used to be commit b3edf17281)
123 lines
4.0 KiB
C
123 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 nbt_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 nbt_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 nbt_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<%02x> to %s:%d\n",
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name->name, name->type, 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 nbt_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 nbt_iface_name *iname;
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struct nbt_interface *iface = talloc_get_type(nbtsock->incoming.private,
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struct nbt_interface);
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NBT_ASSERT_PACKET(packet, src_address, packet->qdcount == 1);
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NBT_ASSERT_PACKET(packet, src_address, packet->questions[0].question_type == NBT_QTYPE_STATUS);
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NBT_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 = nbt_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<%02x> from %s - not found on %s\n",
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name->name, name->type, src_address, iface->ip_address));
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return;
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}
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nbt_node_status_reply(nbtsock, packet, src_address, src_port, &iname->name, iface);
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}
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