mirror of
https://github.com/samba-team/samba.git
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302 lines
8.9 KiB
C
302 lines
8.9 KiB
C
/*
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Unix SMB/CIFS implementation.
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send out a name refresh request
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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 3 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, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "../libcli/nbt/libnbt.h"
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#include "../libcli/nbt/nbt_proto.h"
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#include "libcli/composite/composite.h"
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#include "lib/socket/socket.h"
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/*
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send a nbt name refresh request
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*/
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struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock,
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struct nbt_name_refresh *io)
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{
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struct nbt_name_request *req;
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struct nbt_name_packet *packet;
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struct socket_address *dest;
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packet = talloc_zero(nbtsock, struct nbt_name_packet);
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if (packet == NULL) return NULL;
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packet->qdcount = 1;
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packet->arcount = 1;
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packet->operation = NBT_OPCODE_REFRESH;
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if (io->in.broadcast) {
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packet->operation |= NBT_FLAG_BROADCAST;
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}
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packet->questions = talloc_array(packet, struct nbt_name_question, 1);
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if (packet->questions == NULL) goto failed;
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packet->questions[0].name = io->in.name;
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packet->questions[0].question_type = NBT_QTYPE_NETBIOS;
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packet->questions[0].question_class = NBT_QCLASS_IP;
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packet->additional = talloc_array(packet, struct nbt_res_rec, 1);
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if (packet->additional == NULL) goto failed;
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packet->additional[0].name = io->in.name;
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packet->additional[0].rr_type = NBT_QTYPE_NETBIOS;
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packet->additional[0].rr_class = NBT_QCLASS_IP;
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packet->additional[0].ttl = io->in.ttl;
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packet->additional[0].rdata.netbios.length = 6;
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packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional,
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struct nbt_rdata_address, 1);
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if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed;
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packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags;
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packet->additional[0].rdata.netbios.addresses[0].ipaddr =
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talloc_strdup(packet->additional, io->in.address);
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dest = socket_address_from_strings(nbtsock,
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nbtsock->sock->backend_name,
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io->in.dest_addr, io->in.dest_port);
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if (dest == NULL) goto failed;
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req = nbt_name_request_send(nbtsock, dest, packet,
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io->in.timeout, io->in.retries, false);
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if (req == NULL) goto failed;
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talloc_free(packet);
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return req;
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failed:
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talloc_free(packet);
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return NULL;
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}
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/*
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wait for a refresh reply
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*/
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_PUBLIC_ NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req,
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TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
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{
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NTSTATUS status;
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struct nbt_name_packet *packet;
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status = nbt_name_request_recv(req);
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if (!NT_STATUS_IS_OK(status) ||
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req->num_replies == 0) {
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talloc_free(req);
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return status;
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}
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packet = req->replies[0].packet;
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io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr);
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if (packet->ancount != 1 ||
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packet->answers[0].rr_type != NBT_QTYPE_NETBIOS ||
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packet->answers[0].rr_class != NBT_QCLASS_IP) {
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talloc_free(req);
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return NT_STATUS_INVALID_NETWORK_RESPONSE;
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}
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io->out.rcode = packet->operation & NBT_RCODE;
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io->out.name = packet->answers[0].name;
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if (packet->answers[0].rdata.netbios.length < 6) {
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talloc_free(req);
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return NT_STATUS_INVALID_NETWORK_RESPONSE;
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}
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io->out.reply_addr = talloc_steal(mem_ctx,
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packet->answers[0].rdata.netbios.addresses[0].ipaddr);
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talloc_steal(mem_ctx, io->out.name.name);
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talloc_steal(mem_ctx, io->out.name.scope);
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talloc_free(req);
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return NT_STATUS_OK;
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}
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/*
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synchronous name refresh request
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*/
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_PUBLIC_ NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock,
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TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io)
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{
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struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io);
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return nbt_name_refresh_recv(req, mem_ctx, io);
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}
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/**
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a wins name refresh with multiple WINS servers and multiple
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addresses to refresh. Try each WINS server in turn, until we get a
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reply for each address
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*/
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struct refresh_wins_state {
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struct nbt_name_socket *nbtsock;
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struct nbt_name_refresh *io;
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const char **wins_servers;
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uint16_t wins_port;
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const char **addresses;
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int address_idx;
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struct nbt_name_request *req;
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};
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/**
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state handler for WINS multi-homed multi-server name refresh
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*/
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static void name_refresh_wins_handler(struct nbt_name_request *req)
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{
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struct composite_context *c = talloc_get_type(req->async.private_data,
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struct composite_context);
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struct refresh_wins_state *state = talloc_get_type(c->private_data,
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struct refresh_wins_state);
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NTSTATUS status;
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status = nbt_name_refresh_recv(state->req, state, state->io);
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if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
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/* the refresh timed out - try the next WINS server */
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state->wins_servers++;
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state->address_idx = 0;
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if (state->wins_servers[0] == NULL) {
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c->state = COMPOSITE_STATE_ERROR;
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c->status = status;
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goto done;
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}
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state->io->in.dest_addr = state->wins_servers[0];
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state->io->in.dest_port = state->wins_port;
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state->io->in.address = state->addresses[0];
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state->req = nbt_name_refresh_send(state->nbtsock, state->io);
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if (state->req == NULL) {
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c->state = COMPOSITE_STATE_ERROR;
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c->status = NT_STATUS_NO_MEMORY;
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} else {
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state->req->async.fn = name_refresh_wins_handler;
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state->req->async.private_data = c;
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}
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} else if (!NT_STATUS_IS_OK(status)) {
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c->state = COMPOSITE_STATE_ERROR;
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c->status = status;
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} else {
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if (state->io->out.rcode == 0 &&
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state->addresses[state->address_idx+1] != NULL) {
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/* refresh our next address */
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state->io->in.address = state->addresses[++(state->address_idx)];
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state->req = nbt_name_refresh_send(state->nbtsock, state->io);
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if (state->req == NULL) {
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c->state = COMPOSITE_STATE_ERROR;
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c->status = NT_STATUS_NO_MEMORY;
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} else {
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state->req->async.fn = name_refresh_wins_handler;
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state->req->async.private_data = c;
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}
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} else {
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c->state = COMPOSITE_STATE_DONE;
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c->status = NT_STATUS_OK;
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}
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}
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done:
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if (c->state >= COMPOSITE_STATE_DONE &&
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c->async.fn) {
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c->async.fn(c);
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}
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}
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/**
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the async send call for a multi-server WINS refresh
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*/
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_PUBLIC_ struct composite_context *nbt_name_refresh_wins_send(struct nbt_name_socket *nbtsock,
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struct nbt_name_refresh_wins *io)
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{
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struct composite_context *c;
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struct refresh_wins_state *state;
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c = talloc_zero(nbtsock, struct composite_context);
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if (c == NULL) goto failed;
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state = talloc(c, struct refresh_wins_state);
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if (state == NULL) goto failed;
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state->io = talloc(state, struct nbt_name_refresh);
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if (state->io == NULL) goto failed;
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state->wins_port = io->in.wins_port;
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state->wins_servers = (const char **)str_list_copy(state, io->in.wins_servers);
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if (state->wins_servers == NULL ||
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state->wins_servers[0] == NULL) goto failed;
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state->addresses = (const char **)str_list_copy(state, io->in.addresses);
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if (state->addresses == NULL ||
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state->addresses[0] == NULL) goto failed;
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state->io->in.name = io->in.name;
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state->io->in.dest_addr = state->wins_servers[0];
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state->io->in.dest_port = state->wins_port;
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state->io->in.address = io->in.addresses[0];
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state->io->in.nb_flags = io->in.nb_flags;
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state->io->in.broadcast = false;
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state->io->in.ttl = io->in.ttl;
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state->io->in.timeout = 2;
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state->io->in.retries = 2;
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state->nbtsock = nbtsock;
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state->address_idx = 0;
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state->req = nbt_name_refresh_send(nbtsock, state->io);
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if (state->req == NULL) goto failed;
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state->req->async.fn = name_refresh_wins_handler;
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state->req->async.private_data = c;
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c->private_data = state;
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c->state = COMPOSITE_STATE_IN_PROGRESS;
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c->event_ctx = nbtsock->event_ctx;
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return c;
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failed:
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talloc_free(c);
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return NULL;
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}
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/*
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multi-homed WINS name refresh - recv side
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*/
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_PUBLIC_ NTSTATUS nbt_name_refresh_wins_recv(struct composite_context *c, TALLOC_CTX *mem_ctx,
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struct nbt_name_refresh_wins *io)
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{
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NTSTATUS status;
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status = composite_wait(c);
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if (NT_STATUS_IS_OK(status)) {
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struct refresh_wins_state *state =
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talloc_get_type(c->private_data, struct refresh_wins_state);
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io->out.wins_server = talloc_steal(mem_ctx, state->wins_servers[0]);
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io->out.rcode = state->io->out.rcode;
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}
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talloc_free(c);
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return status;
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}
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/*
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multi-homed WINS refresh - sync interface
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*/
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_PUBLIC_ NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock,
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TALLOC_CTX *mem_ctx,
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struct nbt_name_refresh_wins *io)
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{
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struct composite_context *c = nbt_name_refresh_wins_send(nbtsock, io);
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return nbt_name_refresh_wins_recv(c, mem_ctx, io);
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}
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