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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
521 lines
15 KiB
C
521 lines
15 KiB
C
/*
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Unix SMB/CIFS implementation.
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WINS Replication server
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Copyright (C) Stefan Metzmacher 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 "../lib/util/dlinklist.h"
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#include "samba/service_task.h"
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#include "samba/service.h"
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#include "lib/messaging/irpc.h"
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#include "librpc/gen_ndr/winsrepl.h"
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#include "wrepl_server/wrepl_server.h"
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#include "nbt_server/wins/winsdb.h"
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#include <ldb.h>
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#include <ldb_errors.h>
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#include "auth/auth.h"
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#include "ldb_wrap.h"
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#include "param/param.h"
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#include "lib/socket/netif.h"
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static struct ldb_context *wins_config_db_connect(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev_ctx,
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struct loadparm_context *lp_ctx)
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{
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return ldb_wrap_connect(mem_ctx, ev_ctx, lp_ctx, lpcfg_private_path(mem_ctx,
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lp_ctx, "wins_config.ldb"),
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system_session(lp_ctx), NULL, 0);
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}
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static uint64_t wins_config_db_get_seqnumber(struct ldb_context *ldb)
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{
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int ret;
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struct ldb_dn *dn;
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struct ldb_result *res = NULL;
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TALLOC_CTX *tmp_ctx = talloc_new(ldb);
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uint64_t seqnumber = 0;
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dn = ldb_dn_new(tmp_ctx, ldb, "@BASEINFO");
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if (!dn) goto failed;
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/* find the record in the WINS database */
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ret = ldb_search(ldb, tmp_ctx, &res, dn, LDB_SCOPE_BASE, NULL, NULL);
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if (ret != LDB_SUCCESS) goto failed;
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if (res->count > 1) goto failed;
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if (res->count == 1) {
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seqnumber = ldb_msg_find_attr_as_uint64(res->msgs[0], "sequenceNumber", 0);
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}
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failed:
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talloc_free(tmp_ctx);
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return seqnumber;
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}
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/*
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open winsdb
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*/
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static NTSTATUS wreplsrv_open_winsdb(struct wreplsrv_service *service,
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struct loadparm_context *lp_ctx)
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{
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const char *owner = lpcfg_parm_string(lp_ctx, NULL, "winsdb", "local_owner");
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if (owner == NULL) {
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struct interface *ifaces;
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load_interface_list(service, lp_ctx, &ifaces);
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owner = iface_list_first_v4(ifaces);
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}
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service->wins_db = winsdb_connect(service, service->task->event_ctx, lp_ctx, owner, WINSDB_HANDLE_CALLER_WREPL);
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if (!service->wins_db) {
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return NT_STATUS_INTERNAL_DB_ERROR;
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}
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service->config.ldb = wins_config_db_connect(service, service->task->event_ctx, lp_ctx);
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if (!service->config.ldb) {
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return NT_STATUS_INTERNAL_DB_ERROR;
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}
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/* the default renew interval is 6 days */
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service->config.renew_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","renew_interval", 6*24*60*60);
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/* the default tombstone (extinction) interval is 6 days */
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service->config.tombstone_interval= lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_interval", 6*24*60*60);
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/* the default tombstone (extinction) timeout is 1 day */
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service->config.tombstone_timeout = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_timeout", 1*24*60*60);
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/* the default tombstone extra timeout is 3 days */
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service->config.tombstone_extra_timeout = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","tombstone_extra_timeout", 3*24*60*60);
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/* the default verify interval is 24 days */
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service->config.verify_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","verify_interval", 24*24*60*60);
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/* the default scavenging interval is 'renew_interval/2' */
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service->config.scavenging_interval=lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","scavenging_interval",
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service->config.renew_interval/2);
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/* the maximun interval to the next periodic processing event */
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service->config.periodic_interval = lpcfg_parm_int(lp_ctx, NULL,"wreplsrv","periodic_interval", 15);
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return NT_STATUS_OK;
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}
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struct wreplsrv_partner *wreplsrv_find_partner(struct wreplsrv_service *service, const char *peer_addr)
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{
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struct wreplsrv_partner *cur;
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for (cur = service->partners; cur; cur = cur->next) {
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if (strcmp(cur->address, peer_addr) == 0) {
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return cur;
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}
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}
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return NULL;
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}
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/*
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load our replication partners
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*/
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NTSTATUS wreplsrv_load_partners(struct wreplsrv_service *service)
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{
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struct wreplsrv_partner *partner;
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struct ldb_result *res = NULL;
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int ret;
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TALLOC_CTX *tmp_ctx;
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unsigned int i;
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uint64_t new_seqnumber;
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new_seqnumber = wins_config_db_get_seqnumber(service->config.ldb);
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/* if it's not the first run and nothing changed we're done */
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if (service->config.seqnumber != 0 && service->config.seqnumber == new_seqnumber) {
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return NT_STATUS_OK;
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}
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tmp_ctx = talloc_new(service);
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NT_STATUS_HAVE_NO_MEMORY(tmp_ctx);
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service->config.seqnumber = new_seqnumber;
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/* find the record in the WINS database */
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ret = ldb_search(service->config.ldb, tmp_ctx, &res,
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ldb_dn_new(tmp_ctx, service->config.ldb, "CN=PARTNERS"),
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LDB_SCOPE_SUBTREE, NULL, "(objectClass=wreplPartner)");
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if (ret != LDB_SUCCESS) goto failed;
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/* first disable all existing partners */
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for (partner=service->partners; partner; partner = partner->next) {
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partner->type = WINSREPL_PARTNER_NONE;
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}
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for (i=0; i < res->count; i++) {
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const char *address;
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address = ldb_msg_find_attr_as_string(res->msgs[i], "address", NULL);
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if (!address) {
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goto failed;
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}
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partner = wreplsrv_find_partner(service, address);
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if (partner) {
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if (partner->name != partner->address) {
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talloc_free(discard_const(partner->name));
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}
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partner->name = NULL;
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talloc_free(discard_const(partner->our_address));
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partner->our_address = NULL;
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/* force rescheduling of pulling */
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partner->pull.next_run = timeval_zero();
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} else {
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partner = talloc_zero(service, struct wreplsrv_partner);
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if (partner == NULL) goto failed;
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partner->service = service;
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partner->address = address;
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talloc_steal(partner, partner->address);
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DLIST_ADD_END(service->partners, partner);
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}
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partner->name = ldb_msg_find_attr_as_string(res->msgs[i], "name", partner->address);
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talloc_steal(partner, partner->name);
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partner->our_address = ldb_msg_find_attr_as_string(res->msgs[i], "ourAddress", NULL);
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talloc_steal(partner, partner->our_address);
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partner->type = ldb_msg_find_attr_as_uint(res->msgs[i], "type", WINSREPL_PARTNER_BOTH);
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partner->pull.interval = ldb_msg_find_attr_as_uint(res->msgs[i], "pullInterval",
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WINSREPL_DEFAULT_PULL_INTERVAL);
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partner->pull.retry_interval = ldb_msg_find_attr_as_uint(res->msgs[i], "pullRetryInterval",
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WINSREPL_DEFAULT_PULL_RETRY_INTERVAL);
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partner->push.change_count = ldb_msg_find_attr_as_uint(res->msgs[i], "pushChangeCount",
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WINSREPL_DEFAULT_PUSH_CHANGE_COUNT);
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partner->push.use_inform = ldb_msg_find_attr_as_uint(res->msgs[i], "pushUseInform", true);
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DEBUG(3,("wreplsrv_load_partners: found partner: %s type: 0x%X\n",
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partner->address, partner->type));
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}
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DEBUG(2,("wreplsrv_load_partners: %u partners found: wins_config_db seqnumber %llu\n",
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res->count, (unsigned long long)service->config.seqnumber));
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talloc_free(tmp_ctx);
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return NT_STATUS_OK;
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failed:
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talloc_free(tmp_ctx);
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return NT_STATUS_FOOBAR;
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}
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NTSTATUS wreplsrv_fill_wrepl_table(struct wreplsrv_service *service,
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TALLOC_CTX *mem_ctx,
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struct wrepl_table *table_out,
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const char *initiator,
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bool full_table)
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{
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struct wreplsrv_owner *cur;
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uint32_t i = 0;
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table_out->partner_count = 0;
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table_out->partners = NULL;
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table_out->initiator = initiator;
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for (cur = service->table; cur; cur = cur->next) {
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if (full_table) {
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table_out->partner_count++;
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continue;
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}
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if (strcmp(initiator, cur->owner.address) != 0) continue;
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table_out->partner_count++;
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break;
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}
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table_out->partners = talloc_array(mem_ctx, struct wrepl_wins_owner, table_out->partner_count);
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NT_STATUS_HAVE_NO_MEMORY(table_out->partners);
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for (cur = service->table; cur && i < table_out->partner_count; cur = cur->next) {
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/*
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* if it's our local entry
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* update the max version
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*/
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if (cur == service->owner) {
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cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
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}
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if (full_table) {
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table_out->partners[i] = cur->owner;
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i++;
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continue;
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}
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if (strcmp(initiator, cur->owner.address) != 0) continue;
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table_out->partners[i] = cur->owner;
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i++;
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break;
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}
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return NT_STATUS_OK;
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}
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struct wreplsrv_owner *wreplsrv_find_owner(struct wreplsrv_service *service,
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struct wreplsrv_owner *table,
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const char *wins_owner)
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{
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struct wreplsrv_owner *cur;
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for (cur = table; cur; cur = cur->next) {
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if (strcmp(cur->owner.address, wins_owner) == 0) {
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/*
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* if it's our local entry
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* update the max version
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*/
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if (cur == service->owner) {
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cur->owner.max_version = winsdb_get_maxVersion(service->wins_db);
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}
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return cur;
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}
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}
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return NULL;
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}
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/*
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update the wins_owner_table max_version, if the given version is the highest version
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if no entry for the wins_owner exists yet, create one
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*/
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NTSTATUS wreplsrv_add_table(struct wreplsrv_service *service,
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TALLOC_CTX *mem_ctx, struct wreplsrv_owner **_table,
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const char *wins_owner, uint64_t version)
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{
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struct wreplsrv_owner *table = *_table;
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struct wreplsrv_owner *cur;
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if (!wins_owner || strcmp(wins_owner, "0.0.0.0") == 0) {
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wins_owner = service->wins_db->local_owner;
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}
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cur = wreplsrv_find_owner(service, table, wins_owner);
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/* if it doesn't exists yet, create one */
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if (!cur) {
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cur = talloc_zero(mem_ctx, struct wreplsrv_owner);
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NT_STATUS_HAVE_NO_MEMORY(cur);
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cur->owner.address = talloc_strdup(cur, wins_owner);
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NT_STATUS_HAVE_NO_MEMORY(cur->owner.address);
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cur->owner.min_version = 0;
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cur->owner.max_version = 0;
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cur->owner.type = 1; /* don't know why this is always 1 */
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cur->partner = wreplsrv_find_partner(service, wins_owner);
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DLIST_ADD_END(table, cur);
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*_table = table;
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}
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/* the min_version is always 0 here, and won't be updated */
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/* if the given version is higher than the current max_version, update */
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if (cur->owner.max_version < version) {
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cur->owner.max_version = version;
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/* if it's for our local db, we need to update the wins.ldb too */
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if (cur == service->owner) {
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uint64_t ret;
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ret = winsdb_set_maxVersion(service->wins_db, cur->owner.max_version);
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if (ret != cur->owner.max_version) {
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DEBUG(0,("winsdb_set_maxVersion(%llu) failed: %llu\n",
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(unsigned long long)cur->owner.max_version,
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(unsigned long long)ret));
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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}
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}
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return NT_STATUS_OK;
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}
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/*
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load the partner table
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*/
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static NTSTATUS wreplsrv_load_table(struct wreplsrv_service *service)
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{
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struct ldb_result *res = NULL;
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int ret;
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NTSTATUS status;
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TALLOC_CTX *tmp_ctx = talloc_new(service);
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struct ldb_context *ldb = service->wins_db->ldb;
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unsigned int i;
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struct wreplsrv_owner *local_owner;
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const char *wins_owner;
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uint64_t version;
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const char * const attrs[] = {
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"winsOwner",
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"versionID",
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NULL
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};
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/*
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* make sure we have our local entry in the list,
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* but we set service->owner when we're done
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* to avoid to many calls to wreplsrv_local_max_version()
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*/
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status = wreplsrv_add_table(service,
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service, &service->table,
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service->wins_db->local_owner, 0);
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if (!NT_STATUS_IS_OK(status)) goto failed;
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local_owner = wreplsrv_find_owner(service, service->table, service->wins_db->local_owner);
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if (!local_owner) {
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status = NT_STATUS_INTERNAL_ERROR;
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goto failed;
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}
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/* find the record in the WINS database */
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ret = ldb_search(ldb, tmp_ctx, &res, NULL, LDB_SCOPE_SUBTREE,
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attrs, "(objectClass=winsRecord)");
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status = NT_STATUS_INTERNAL_DB_CORRUPTION;
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if (ret != LDB_SUCCESS) goto failed;
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for (i=0; i < res->count; i++) {
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wins_owner = ldb_msg_find_attr_as_string(res->msgs[i], "winsOwner", NULL);
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version = ldb_msg_find_attr_as_uint64(res->msgs[i], "versionID", 0);
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status = wreplsrv_add_table(service,
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service, &service->table,
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wins_owner, version);
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if (!NT_STATUS_IS_OK(status)) goto failed;
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talloc_free(res->msgs[i]);
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}
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/*
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* this makes sure we call wreplsrv_local_max_version() before returning in
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* wreplsrv_find_owner()
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*/
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service->owner = local_owner;
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/*
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* this makes sure the maxVersion in the database is updated,
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* with the highest version we found, if this is higher than the current stored one
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*/
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status = wreplsrv_add_table(service,
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service, &service->table,
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service->wins_db->local_owner, local_owner->owner.max_version);
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if (!NT_STATUS_IS_OK(status)) goto failed;
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talloc_free(tmp_ctx);
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return NT_STATUS_OK;
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failed:
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talloc_free(tmp_ctx);
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return status;
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}
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/*
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setup our replication partners
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*/
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static NTSTATUS wreplsrv_setup_partners(struct wreplsrv_service *service)
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{
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NTSTATUS status;
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status = wreplsrv_load_partners(service);
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NT_STATUS_NOT_OK_RETURN(status);
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status = wreplsrv_load_table(service);
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NT_STATUS_NOT_OK_RETURN(status);
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return NT_STATUS_OK;
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}
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/*
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startup the wrepl task
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*/
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static NTSTATUS wreplsrv_task_init(struct task_server *task)
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{
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NTSTATUS status;
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struct wreplsrv_service *service;
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if (!lpcfg_we_are_a_wins_server(task->lp_ctx)) {
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return NT_STATUS_INVALID_DOMAIN_ROLE;
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}
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task_server_set_title(task, "task[wreplsrv]");
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service = talloc_zero(task, struct wreplsrv_service);
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if (!service) {
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task_server_terminate(task, "wreplsrv_task_init: out of memory", true);
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return NT_STATUS_NO_MEMORY;
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}
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service->task = task;
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service->startup_time = timeval_current();
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task->private_data = service;
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/*
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* setup up all partners, and open the winsdb
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*/
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status = wreplsrv_open_winsdb(service, task->lp_ctx);
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if (!NT_STATUS_IS_OK(status)) {
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task_server_terminate(task, "wreplsrv_task_init: wreplsrv_open_winsdb() failed", true);
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return status;
|
|
}
|
|
|
|
/*
|
|
* setup timed events for each partner we want to pull from
|
|
*/
|
|
status = wreplsrv_setup_partners(service);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_partners() failed", true);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* setup listen sockets, so we can answer requests from our partners,
|
|
* which pull from us
|
|
*/
|
|
status = wreplsrv_setup_sockets(service, task->lp_ctx);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_sockets() failed", true);
|
|
return status;
|
|
}
|
|
|
|
status = wreplsrv_setup_periodic(service);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
task_server_terminate(task, "wreplsrv_task_init: wreplsrv_setup_periodic() failed", true);
|
|
return status;
|
|
}
|
|
|
|
irpc_add_name(task->msg_ctx, "wrepl_server");
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/*
|
|
register ourselves as a available server
|
|
*/
|
|
NTSTATUS server_service_wrepl_init(TALLOC_CTX *ctx)
|
|
{
|
|
static const struct service_details details = {
|
|
.inhibit_fork_on_accept = true,
|
|
.inhibit_pre_fork = true,
|
|
.task_init = wreplsrv_task_init,
|
|
.post_fork = NULL
|
|
};
|
|
return register_server_service(ctx, "wrepl", &details);
|
|
}
|