1/* 2 Unix SMB/CIFS implementation. 3 4 answer node status queries 5 6 Copyright (C) Andrew Tridgell 2005 7 8 This program is free software; you can redistribute it and/or modify 9 it under the terms of the GNU General Public License as published by 10 the Free Software Foundation; either version 3 of the License, or 11 (at your option) any later version. 12 13 This program is distributed in the hope that it will be useful, 14 but WITHOUT ANY WARRANTY; without even the implied warranty of 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 GNU General Public License for more details. 17 18 You should have received a copy of the GNU General Public License 19 along with this program. If not, see <http://www.gnu.org/licenses/>. 20*/ 21 22#include "includes.h" 23#include "../lib/util/dlinklist.h" 24#include "system/network.h" 25#include "nbt_server/nbt_server.h" 26#include "lib/socket/socket.h" 27#include "librpc/gen_ndr/ndr_nbt.h" 28 29/* 30 send a name status reply 31*/ 32static void nbtd_node_status_reply(struct nbt_name_socket *nbtsock, 33 struct nbt_name_packet *request_packet, 34 struct socket_address *src, 35 struct nbt_name *name, 36 struct nbtd_interface *iface) 37{ 38 struct nbt_name_packet *packet; 39 uint32_t name_count; 40 struct nbtd_iface_name *iname; 41 struct nbtd_server *nbtsrv = iface->nbtsrv; 42 43 /* work out how many names to send */ 44 name_count = 0; 45 for (iname=iface->names;iname;iname=iname->next) { 46 if ((iname->nb_flags & NBT_NM_ACTIVE) && 47 strcmp(iname->name.name, "*") != 0) { 48 name_count++; 49 } 50 } 51 52 packet = talloc_zero(nbtsock, struct nbt_name_packet); 53 if (packet == NULL) return; 54 55 packet->name_trn_id = request_packet->name_trn_id; 56 packet->ancount = 1; 57 packet->operation = NBT_OPCODE_QUERY | NBT_FLAG_REPLY | NBT_FLAG_AUTHORITIVE; 58 59 packet->answers = talloc_array(packet, struct nbt_res_rec, 1); 60 if (packet->answers == NULL) goto failed; 61 62 packet->answers[0].name = *name; 63 packet->answers[0].rr_type = NBT_QTYPE_STATUS; 64 packet->answers[0].rr_class = NBT_QCLASS_IP; 65 packet->answers[0].ttl = 0; 66 packet->answers[0].rdata.status.num_names = name_count; 67 packet->answers[0].rdata.status.names = talloc_array(packet->answers, 68 struct nbt_status_name, name_count); 69 if (packet->answers[0].rdata.status.names == NULL) goto failed; 70 71 name_count = 0; 72 for (iname=iface->names;iname;iname=iname->next) { 73 if ((iname->nb_flags & NBT_NM_ACTIVE) && 74 strcmp(iname->name.name, "*") != 0) { 75 struct nbt_status_name *n = &packet->answers[0].rdata.status.names[name_count]; 76 n->name = talloc_asprintf(packet->answers, "%-15s", iname->name.name); 77 if (n->name == NULL) goto failed; 78 n->type = iname->name.type; 79 n->nb_flags = iname->nb_flags; 80 name_count++; 81 } 82 } 83 /* we deliberately don't fill in the statistics structure as 84 it could lead to giving attackers too much information */ 85 ZERO_STRUCT(packet->answers[0].rdata.status.statistics); 86 87 DEBUG(7,("Sending node status reply for %s to %s:%d\n", 88 nbt_name_string(packet, name), src->addr, src->port)); 89 90 nbtsrv->stats.total_sent++; 91 nbt_name_reply_send(nbtsock, src, packet); 92 93failed: 94 talloc_free(packet); 95} 96 97 98/* 99 answer a node status query 100*/ 101void nbtd_query_status(struct nbt_name_socket *nbtsock, 102 struct nbt_name_packet *packet, 103 struct socket_address *src) 104{ 105 struct nbt_name *name; 106 struct nbtd_iface_name *iname; 107 struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data, 108 struct nbtd_interface); 109 110 NBTD_ASSERT_PACKET(packet, src, packet->qdcount == 1); 111 NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_type == NBT_QTYPE_STATUS); 112 NBTD_ASSERT_PACKET(packet, src, packet->questions[0].question_class == NBT_QCLASS_IP); 113 114 /* see if we have the requested name on this interface */ 115 name = &packet->questions[0].name; 116 117 iname = nbtd_find_iname(iface, name, NBT_NM_ACTIVE); 118 if (iname == NULL) { 119 DEBUG(7,("Node status query for %s from %s - not found on %s\n", 120 nbt_name_string(packet, name), src->addr, iface->ip_address)); 121 return; 122 } 123 124 nbtd_node_status_reply(nbtsock, packet, src, 125 &iname->name, iface); 126} 127