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4142bde7e5
Signed-off-by: Ralph Boehme <slow@samba.org> Reviewed-by: Andrew Bartlett <abartlet@samba.org> Autobuild-User(master): Ralph Böhme <slow@samba.org> Autobuild-Date(master): Fri Nov 27 10:07:18 UTC 2020 on sn-devel-184
285 lines
8.2 KiB
C
285 lines
8.2 KiB
C
/*
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Unix SMB/CIFS implementation.
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wins client name registration and refresh
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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 "nbt_server/nbt_server.h"
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#include "nbt_server/wins/winsserver.h"
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#include "libcli/composite/composite.h"
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#include "lib/events/events.h"
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#include "librpc/gen_ndr/ndr_nbt.h"
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#include "samba/service_task.h"
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#include "param/param.h"
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/* we send WINS client requests using our primary network interface
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*/
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static struct nbt_name_socket *wins_socket(struct nbtd_interface *iface)
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{
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struct nbtd_server *nbtsrv = iface->nbtsrv;
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return nbtsrv->interfaces->nbtsock;
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}
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static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
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struct timeval t, void *private_data);
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/*
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retry a WINS name registration
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*/
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static void nbtd_wins_register_retry(struct tevent_context *ev, struct tevent_timer *te,
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struct timeval t, void *private_data)
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{
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struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
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nbtd_winsclient_register(iname);
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}
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/*
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start a timer to refresh this name
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*/
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static void nbtd_wins_start_refresh_timer(struct nbtd_iface_name *iname)
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{
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uint32_t refresh_time;
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uint32_t max_refresh_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "max_refresh_time", 7200);
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refresh_time = MIN(max_refresh_time, iname->ttl/2);
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tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
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iname,
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timeval_add(&iname->registration_time, refresh_time, 0),
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nbtd_wins_refresh, iname);
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}
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struct nbtd_wins_refresh_state {
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struct nbtd_iface_name *iname;
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struct nbt_name_refresh_wins io;
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};
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/*
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called when a wins name refresh has completed
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*/
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static void nbtd_wins_refresh_handler(struct tevent_req *subreq)
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{
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NTSTATUS status;
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struct nbtd_wins_refresh_state *state =
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tevent_req_callback_data(subreq,
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struct nbtd_wins_refresh_state);
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struct nbtd_iface_name *iname = state->iname;
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status = nbt_name_refresh_wins_recv(subreq, state, &state->io);
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TALLOC_FREE(subreq);
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if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
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/* our WINS server is dead - start registration over
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from scratch */
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DEBUG(2,("Failed to refresh %s with WINS server %s\n",
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nbt_name_string(state, &iname->name), iname->wins_server));
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talloc_free(state);
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nbtd_winsclient_register(iname);
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return;
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}
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1,("Name refresh failure with WINS for %s - %s\n",
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nbt_name_string(state, &iname->name), nt_errstr(status)));
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talloc_free(state);
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return;
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}
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if (state->io.out.rcode != 0) {
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DEBUG(1,("WINS server %s rejected name refresh of %s - %s\n",
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state->io.out.wins_server,
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nbt_name_string(state, &iname->name),
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nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
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iname->nb_flags |= NBT_NM_CONFLICT;
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talloc_free(state);
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return;
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}
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DEBUG(4,("Refreshed name %s with WINS server %s\n",
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nbt_name_string(state, &iname->name), iname->wins_server));
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/* success - start a periodic name refresh */
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iname->nb_flags |= NBT_NM_ACTIVE;
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if (iname->wins_server) {
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/*
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* talloc_free() would generate a warning,
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* so steal it into the tmp context
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*/
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talloc_steal(state, iname->wins_server);
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}
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iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
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iname->registration_time = timeval_current();
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talloc_free(state);
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nbtd_wins_start_refresh_timer(iname);
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}
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/*
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refresh a WINS name registration
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*/
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static void nbtd_wins_refresh(struct tevent_context *ev, struct tevent_timer *te,
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struct timeval t, void *private_data)
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{
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struct nbtd_iface_name *iname = talloc_get_type(private_data, struct nbtd_iface_name);
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struct nbtd_interface *iface = iname->iface;
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struct nbt_name_socket *nbtsock = wins_socket(iface);
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struct tevent_req *subreq;
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struct nbtd_wins_refresh_state *state;
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char **l;
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state = talloc_zero(iname, struct nbtd_wins_refresh_state);
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if (state == NULL) {
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return;
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}
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state->iname = iname;
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/* setup a wins name refresh request */
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state->io.in.name = iname->name;
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l = str_list_make_single(state, iname->wins_server);
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state->io.in.wins_servers = discard_const_p(const char *, l);
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state->io.in.wins_port = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
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state->io.in.addresses = nbtd_address_list(iface, state);
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state->io.in.nb_flags = iname->nb_flags;
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state->io.in.ttl = iname->ttl;
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if (!state->io.in.addresses) {
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talloc_free(state);
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return;
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}
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subreq = nbt_name_refresh_wins_send(state, ev, nbtsock, &state->io);
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if (subreq == NULL) {
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talloc_free(state);
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return;
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}
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tevent_req_set_callback(subreq, nbtd_wins_refresh_handler, state);
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}
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struct nbtd_wins_register_state {
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struct nbtd_iface_name *iname;
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struct nbt_name_register_wins io;
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};
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/*
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called when a wins name register has completed
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*/
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static void nbtd_wins_register_handler(struct tevent_req *subreq)
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{
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NTSTATUS status;
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struct nbtd_wins_register_state *state =
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tevent_req_callback_data(subreq,
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struct nbtd_wins_register_state);
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struct nbtd_iface_name *iname = state->iname;
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status = nbt_name_register_wins_recv(subreq, state, &state->io);
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TALLOC_FREE(subreq);
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if (NT_STATUS_EQUAL(status, NT_STATUS_IO_TIMEOUT)) {
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/* none of the WINS servers responded - try again
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periodically */
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int wins_retry_time = lpcfg_parm_int(iname->iface->nbtsrv->task->lp_ctx, NULL, "nbtd", "wins_retry", 300);
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tevent_add_timer(iname->iface->nbtsrv->task->event_ctx,
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iname,
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timeval_current_ofs(wins_retry_time, 0),
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nbtd_wins_register_retry,
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iname);
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talloc_free(state);
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return;
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}
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1,("Name register failure with WINS for %s - %s\n",
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nbt_name_string(state, &iname->name), nt_errstr(status)));
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talloc_free(state);
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return;
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}
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if (state->io.out.rcode != 0) {
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DEBUG(1,("WINS server %s rejected name register of %s - %s\n",
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state->io.out.wins_server,
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nbt_name_string(state, &iname->name),
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nt_errstr(nbt_rcode_to_ntstatus(state->io.out.rcode))));
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iname->nb_flags |= NBT_NM_CONFLICT;
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talloc_free(state);
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return;
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}
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/* success - start a periodic name refresh */
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iname->nb_flags |= NBT_NM_ACTIVE;
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if (iname->wins_server) {
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/*
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* talloc_free() would generate a warning,
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* so steal it into the tmp context
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*/
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talloc_steal(state, iname->wins_server);
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}
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iname->wins_server = talloc_move(iname, &state->io.out.wins_server);
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iname->registration_time = timeval_current();
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DEBUG(3,("Registered %s with WINS server %s\n",
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nbt_name_string(state, &iname->name), iname->wins_server));
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talloc_free(state);
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nbtd_wins_start_refresh_timer(iname);
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}
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/*
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register a name with our WINS servers
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*/
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void nbtd_winsclient_register(struct nbtd_iface_name *iname)
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{
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struct nbtd_interface *iface = iname->iface;
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struct nbt_name_socket *nbtsock = wins_socket(iface);
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struct nbtd_wins_register_state *state;
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struct tevent_req *subreq;
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state = talloc_zero(iname, struct nbtd_wins_register_state);
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if (state == NULL) {
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return;
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}
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state->iname = iname;
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/* setup a wins name register request */
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state->io.in.name = iname->name;
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state->io.in.wins_port = lpcfg_nbt_port(iface->nbtsrv->task->lp_ctx);
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state->io.in.wins_servers = lpcfg_wins_server_list(iface->nbtsrv->task->lp_ctx);
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state->io.in.addresses = nbtd_address_list(iface, state);
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state->io.in.nb_flags = iname->nb_flags;
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state->io.in.ttl = iname->ttl;
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if (state->io.in.addresses == NULL) {
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talloc_free(state);
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return;
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}
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subreq = nbt_name_register_wins_send(state, iface->nbtsrv->task->event_ctx,
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nbtsock, &state->io);
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if (subreq == NULL) {
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talloc_free(state);
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return;
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}
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tevent_req_set_callback(subreq, nbtd_wins_register_handler, state);
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}
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