1/* 2 Unix SMB/CIFS implementation. 3 4 nbt list of addresses name resolution module 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/* 23 TODO: we should lower the timeout, and add retries for each name 24*/ 25 26#include "includes.h" 27#include "libcli/composite/composite.h" 28#include "system/network.h" 29#include "lib/socket/socket.h" 30#include "lib/socket/netif.h" 31#include "librpc/gen_ndr/ndr_nbt.h" 32#include "../libcli/nbt/libnbt.h" 33#include "param/param.h" 34#include "libcli/resolve/resolve.h" 35 36struct nbtlist_state { 37 uint16_t flags; 38 uint16_t port; 39 struct nbt_name name; 40 struct nbt_name_socket *nbtsock; 41 int num_queries; 42 struct nbt_name_request **queries; 43 struct nbt_name_query *io_queries; 44 struct socket_address **addrs; 45 char **names; 46 struct interface *ifaces; 47}; 48 49/* 50 handle events during nbtlist name resolution 51*/ 52static void nbtlist_handler(struct nbt_name_request *req) 53{ 54 struct composite_context *c = talloc_get_type(req->async.private_data, 55 struct composite_context); 56 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state); 57 struct nbt_name_query *q; 58 int i; 59 60 for (i=0;i<state->num_queries;i++) { 61 if (req == state->queries[i]) break; 62 } 63 64 if (i == state->num_queries) { 65 /* not for us?! */ 66 composite_error(c, NT_STATUS_INTERNAL_ERROR); 67 return; 68 } 69 70 q = &state->io_queries[i]; 71 72 c->status = nbt_name_query_recv(req, state, q); 73 74 /* free the network resource directly */ 75 talloc_free(state->nbtsock); 76 if (!composite_is_ok(c)) return; 77 78 if (q->out.num_addrs < 1) { 79 composite_error(c, NT_STATUS_UNEXPECTED_NETWORK_ERROR); 80 return; 81 } 82 83 state->addrs = talloc_array(state, struct socket_address *, 84 q->out.num_addrs + 1); 85 if (composite_nomem(state->addrs, c)) return; 86 87 state->names = talloc_array(state, char *, q->out.num_addrs + 1); 88 if (composite_nomem(state->names, c)) return; 89 90 for (i=0;i<q->out.num_addrs;i++) { 91 state->addrs[i] = socket_address_from_strings(state->addrs, 92 "ipv4", 93 q->out.reply_addrs[i], 94 state->port); 95 if (composite_nomem(state->addrs[i], c)) return; 96 97 state->names[i] = talloc_strdup(state->names, state->name.name); 98 if (composite_nomem(state->names[i], c)) return; 99 } 100 state->addrs[i] = NULL; 101 state->names[i] = NULL; 102 103 composite_done(c); 104} 105 106/* 107 nbtlist name resolution method - async send 108 */ 109struct composite_context *resolve_name_nbtlist_send(TALLOC_CTX *mem_ctx, 110 struct tevent_context *event_ctx, 111 uint32_t flags, 112 uint16_t port, 113 struct nbt_name *name, 114 const char **address_list, 115 struct interface *ifaces, 116 uint16_t nbt_port, 117 int nbt_timeout, 118 bool broadcast, 119 bool wins_lookup) 120{ 121 struct composite_context *c; 122 struct nbtlist_state *state; 123 int i; 124 125 c = composite_create(mem_ctx, event_ctx); 126 if (c == NULL) return NULL; 127 128 if (flags & RESOLVE_NAME_FLAG_FORCE_DNS) { 129 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND); 130 return c; 131 } 132 133 if (strlen(name->name) > 15) { 134 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND); 135 return c; 136 } 137 138 state = talloc(c, struct nbtlist_state); 139 if (composite_nomem(state, c)) return c; 140 c->private_data = state; 141 142 state->flags = flags; 143 state->port = port; 144 145 c->status = nbt_name_dup(state, name, &state->name); 146 if (!composite_is_ok(c)) return c; 147 148 state->name.name = strupper_talloc(state, state->name.name); 149 if (composite_nomem(state->name.name, c)) return c; 150 if (state->name.scope) { 151 state->name.scope = strupper_talloc(state, state->name.scope); 152 if (composite_nomem(state->name.scope, c)) return c; 153 } 154 155 state->ifaces = talloc_reference(state, ifaces); 156 157 /* 158 * we can't push long names on the wire, 159 * so bail out here to give a useful error message 160 */ 161 if (strlen(state->name.name) > 15) { 162 composite_error(c, NT_STATUS_OBJECT_NAME_NOT_FOUND); 163 return c; 164 } 165 166 state->nbtsock = nbt_name_socket_init(state, event_ctx, 167 global_iconv_convenience); 168 if (composite_nomem(state->nbtsock, c)) return c; 169 170 /* count the address_list size */ 171 for (i=0;address_list[i];i++) /* noop */ ; 172 173 state->num_queries = i; 174 state->io_queries = talloc_array(state, struct nbt_name_query, state->num_queries); 175 if (composite_nomem(state->io_queries, c)) return c; 176 177 state->queries = talloc_array(state, struct nbt_name_request *, state->num_queries); 178 if (composite_nomem(state->queries, c)) return c; 179 180 for (i=0;i<state->num_queries;i++) { 181 state->io_queries[i].in.name = state->name; 182 state->io_queries[i].in.dest_addr = talloc_strdup(state->io_queries, address_list[i]); 183 state->io_queries[i].in.dest_port = nbt_port; 184 if (composite_nomem(state->io_queries[i].in.dest_addr, c)) return c; 185 186 state->io_queries[i].in.broadcast = broadcast; 187 state->io_queries[i].in.wins_lookup = wins_lookup; 188 state->io_queries[i].in.timeout = nbt_timeout; 189 state->io_queries[i].in.retries = 2; 190 191 state->queries[i] = nbt_name_query_send(state->nbtsock, &state->io_queries[i]); 192 if (composite_nomem(state->queries[i], c)) return c; 193 194 state->queries[i]->async.fn = nbtlist_handler; 195 state->queries[i]->async.private_data = c; 196 } 197 198 return c; 199} 200 201/* 202 nbt list of addresses name resolution method - recv side 203 */ 204NTSTATUS resolve_name_nbtlist_recv(struct composite_context *c, 205 TALLOC_CTX *mem_ctx, 206 struct socket_address ***addrs, 207 char ***names) 208{ 209 NTSTATUS status; 210 211 status = composite_wait(c); 212 213 if (NT_STATUS_IS_OK(status)) { 214 struct nbtlist_state *state = talloc_get_type(c->private_data, struct nbtlist_state); 215 *addrs = talloc_steal(mem_ctx, state->addrs); 216 if (names) { 217 *names = talloc_steal(mem_ctx, state->names); 218 } 219 } 220 221 talloc_free(c); 222 return status; 223} 224 225