/* Unix SMB/CIFS implementation. send out a name refresh request Copyright (C) Andrew Tridgell 2005 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #include <tevent.h> #include "../libcli/nbt/libnbt.h" #include "../libcli/nbt/nbt_proto.h" #include "lib/socket/socket.h" #include "lib/util/tevent_ntstatus.h" /* send a nbt name refresh request */ struct nbt_name_request *nbt_name_refresh_send(struct nbt_name_socket *nbtsock, struct nbt_name_refresh *io) { struct nbt_name_request *req; struct nbt_name_packet *packet; struct socket_address *dest; packet = talloc_zero(nbtsock, struct nbt_name_packet); if (packet == NULL) return NULL; packet->qdcount = 1; packet->arcount = 1; packet->operation = NBT_OPCODE_REFRESH; if (io->in.broadcast) { packet->operation |= NBT_FLAG_BROADCAST; } packet->questions = talloc_array(packet, struct nbt_name_question, 1); if (packet->questions == NULL) goto failed; packet->questions[0].name = io->in.name; packet->questions[0].question_type = NBT_QTYPE_NETBIOS; packet->questions[0].question_class = NBT_QCLASS_IP; packet->additional = talloc_array(packet, struct nbt_res_rec, 1); if (packet->additional == NULL) goto failed; packet->additional[0].name = io->in.name; packet->additional[0].rr_type = NBT_QTYPE_NETBIOS; packet->additional[0].rr_class = NBT_QCLASS_IP; packet->additional[0].ttl = io->in.ttl; packet->additional[0].rdata.netbios.length = 6; packet->additional[0].rdata.netbios.addresses = talloc_array(packet->additional, struct nbt_rdata_address, 1); if (packet->additional[0].rdata.netbios.addresses == NULL) goto failed; packet->additional[0].rdata.netbios.addresses[0].nb_flags = io->in.nb_flags; packet->additional[0].rdata.netbios.addresses[0].ipaddr = talloc_strdup(packet->additional, io->in.address); dest = socket_address_from_strings(nbtsock, nbtsock->sock->backend_name, io->in.dest_addr, io->in.dest_port); if (dest == NULL) goto failed; req = nbt_name_request_send(nbtsock, dest, packet, io->in.timeout, io->in.retries, false); if (req == NULL) goto failed; talloc_free(packet); return req; failed: talloc_free(packet); return NULL; } /* wait for a refresh reply */ _PUBLIC_ NTSTATUS nbt_name_refresh_recv(struct nbt_name_request *req, TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io) { NTSTATUS status; struct nbt_name_packet *packet; status = nbt_name_request_recv(req); if (!NT_STATUS_IS_OK(status) || req->num_replies == 0) { talloc_free(req); return status; } packet = req->replies[0].packet; io->out.reply_from = talloc_steal(mem_ctx, req->replies[0].dest->addr); if (packet->ancount != 1 || packet->answers[0].rr_type != NBT_QTYPE_NETBIOS || packet->answers[0].rr_class != NBT_QCLASS_IP) { talloc_free(req); return NT_STATUS_INVALID_NETWORK_RESPONSE; } io->out.rcode = packet->operation & NBT_RCODE; io->out.name = packet->answers[0].name; if (packet->answers[0].rdata.netbios.length < 6) { talloc_free(req); return NT_STATUS_INVALID_NETWORK_RESPONSE; } io->out.reply_addr = talloc_steal(mem_ctx, packet->answers[0].rdata.netbios.addresses[0].ipaddr); talloc_steal(mem_ctx, io->out.name.name); talloc_steal(mem_ctx, io->out.name.scope); talloc_free(req); return NT_STATUS_OK; } /* synchronous name refresh request */ _PUBLIC_ NTSTATUS nbt_name_refresh(struct nbt_name_socket *nbtsock, TALLOC_CTX *mem_ctx, struct nbt_name_refresh *io) { struct nbt_name_request *req = nbt_name_refresh_send(nbtsock, io); return nbt_name_refresh_recv(req, mem_ctx, io); } /** a wins name refresh with multiple WINS servers and multiple addresses to refresh. Try each WINS server in turn, until we get a reply for each address */ struct nbt_name_refresh_wins_state { struct nbt_name_socket *nbtsock; struct nbt_name_refresh *io; char **wins_servers; uint16_t wins_port; char **addresses; int address_idx; }; static void nbt_name_refresh_wins_handler(struct nbt_name_request *subreq); /** the async send call for a multi-server WINS refresh */ _PUBLIC_ struct tevent_req *nbt_name_refresh_wins_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct nbt_name_socket *nbtsock, struct nbt_name_refresh_wins *io) { struct tevent_req *req; struct nbt_name_refresh_wins_state *state; struct nbt_name_request *subreq; req = tevent_req_create(mem_ctx, &state, struct nbt_name_refresh_wins_state); if (req == NULL) { return NULL; } state->io = talloc(state, struct nbt_name_refresh); if (tevent_req_nomem(state->io, req)) { return tevent_req_post(req, ev); } if (io->in.wins_servers == NULL) { tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER); return tevent_req_post(req, ev); } if (io->in.wins_servers[0] == NULL) { tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER); return tevent_req_post(req, ev); } if (io->in.addresses == NULL) { tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER); return tevent_req_post(req, ev); } if (io->in.addresses[0] == NULL) { tevent_req_nterror(req, NT_STATUS_INVALID_PARAMETER); return tevent_req_post(req, ev); } state->wins_port = io->in.wins_port; state->wins_servers = str_list_copy(state, io->in.wins_servers); if (tevent_req_nomem(state->wins_servers, req)) { return tevent_req_post(req, ev); } state->addresses = str_list_copy(state, io->in.addresses); if (tevent_req_nomem(state->addresses, req)) { return tevent_req_post(req, ev); } state->io->in.name = io->in.name; state->io->in.dest_addr = state->wins_servers[0]; state->io->in.dest_port = state->wins_port; state->io->in.address = io->in.addresses[0]; state->io->in.nb_flags = io->in.nb_flags; state->io->in.broadcast = false; state->io->in.ttl = io->in.ttl; state->io->in.timeout = 2; state->io->in.retries = 2; state->nbtsock = nbtsock; state->address_idx = 0; subreq = nbt_name_refresh_send(nbtsock, state->io); if (tevent_req_nomem(subreq, req)) { return tevent_req_post(req, ev); } subreq->async.fn = nbt_name_refresh_wins_handler; subreq->async.private_data = req; return req; } static void nbt_name_refresh_wins_handler(struct nbt_name_request *subreq) { struct tevent_req *req = talloc_get_type_abort(subreq->async.private_data, struct tevent_req); struct nbt_name_refresh_wins_state *state = tevent_req_data(req, struct nbt_name_refresh_wins_state); NTSTATUS status; status = nbt_name_refresh_recv(subreq, state, state->io); if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) { /* the refresh timed out - try the next WINS server */ state->wins_servers++; if (state->wins_servers[0] == NULL) { tevent_req_nterror(req, status); return; } state->address_idx = 0; state->io->in.dest_addr = state->wins_servers[0]; state->io->in.dest_port = state->wins_port; state->io->in.address = state->addresses[0]; subreq = nbt_name_refresh_send(state->nbtsock, state->io); if (tevent_req_nomem(subreq, req)) { return; } subreq->async.fn = nbt_name_refresh_wins_handler; subreq->async.private_data = req; } else if (!NT_STATUS_IS_OK(status)) { tevent_req_nterror(req, status); return; } if (state->io->out.rcode == 0 && state->addresses[state->address_idx+1] != NULL) { /* refresh our next address */ state->io->in.address = state->addresses[++(state->address_idx)]; subreq = nbt_name_refresh_send(state->nbtsock, state->io); if (tevent_req_nomem(subreq, req)) { return; } subreq->async.fn = nbt_name_refresh_wins_handler; subreq->async.private_data = req; return; } tevent_req_done(req); } /* multi-homed WINS name refresh - recv side */ _PUBLIC_ NTSTATUS nbt_name_refresh_wins_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, struct nbt_name_refresh_wins *io) { struct nbt_name_refresh_wins_state *state = tevent_req_data(req, struct nbt_name_refresh_wins_state); NTSTATUS status; if (tevent_req_is_nterror(req, &status)) { tevent_req_received(req); return status; } io->out.wins_server = talloc_move(mem_ctx, &state->wins_servers[0]); io->out.rcode = state->io->out.rcode; tevent_req_received(req); return NT_STATUS_OK; } /* multi-homed WINS refresh - sync interface */ _PUBLIC_ NTSTATUS nbt_name_refresh_wins(struct nbt_name_socket *nbtsock, TALLOC_CTX *mem_ctx, struct nbt_name_refresh_wins *io) { TALLOC_CTX *frame = talloc_stackframe(); struct tevent_context *ev; struct tevent_req *subreq; NTSTATUS status; /* * TODO: create a temporary event context */ ev = nbtsock->event_ctx; subreq = nbt_name_refresh_wins_send(frame, ev, nbtsock, io); if (subreq == NULL) { talloc_free(frame); return NT_STATUS_NO_MEMORY; } if (!tevent_req_poll(subreq, ev)) { status = map_nt_error_from_unix_common(errno); talloc_free(frame); return status; } status = nbt_name_refresh_wins_recv(subreq, mem_ctx, io); if (!NT_STATUS_IS_OK(status)) { talloc_free(frame); return status; } TALLOC_FREE(frame); return NT_STATUS_OK; }