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|
/*
Unix SMB/CIFS implementation.
WINS Replication server
Copyright (C) Stefan Metzmacher 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 "librpc/gen_ndr/ndr_winsrepl.h"
#include "wrepl_server/wrepl_server.h"
#include "nbt_server/wins/winsdb.h"
#include <ldb.h>
#include <ldb_errors.h>
#include "system/time.h"
#include "samba/service_task.h"
#include "lib/messaging/irpc.h"
#include "librpc/gen_ndr/ndr_irpc_c.h"
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"
const char *wreplsrv_owner_filter(struct wreplsrv_service *service,
TALLOC_CTX *mem_ctx,
const char *wins_owner)
{
if (strcmp(wins_owner, service->wins_db->local_owner) == 0) {
return talloc_asprintf(mem_ctx, "(|(winsOwner=%s)(winsOwner=0.0.0.0))",
wins_owner);
}
return talloc_asprintf(mem_ctx, "(&(winsOwner=%s)(!(winsOwner=0.0.0.0)))",
wins_owner);
}
static NTSTATUS wreplsrv_scavenging_owned_records(struct wreplsrv_service *service, TALLOC_CTX *tmp_mem)
{
NTSTATUS status;
struct winsdb_record *rec = NULL;
struct ldb_result *res = NULL;
const char *owner_filter;
const char *filter;
unsigned int i;
int ret;
time_t now = time(NULL);
const char *now_timestr;
const char *action;
const char *old_state=NULL;
const char *new_state=NULL;
uint32_t modify_flags;
bool modify_record;
bool delete_record;
bool delete_tombstones;
struct timeval tombstone_extra_time;
const char *local_owner = service->wins_db->local_owner;
bool propagate = lpcfg_parm_bool(service->task->lp_ctx, NULL, "wreplsrv", "propagate name releases", false);
now_timestr = ldb_timestring(tmp_mem, now);
NT_STATUS_HAVE_NO_MEMORY(now_timestr);
owner_filter = wreplsrv_owner_filter(service, tmp_mem, local_owner);
NT_STATUS_HAVE_NO_MEMORY(owner_filter);
filter = talloc_asprintf(tmp_mem,
"(&%s(objectClass=winsRecord)"
"(expireTime<=%s))",
owner_filter, now_timestr);
NT_STATUS_HAVE_NO_MEMORY(filter);
ret = ldb_search(service->wins_db->ldb, tmp_mem, &res, NULL, LDB_SCOPE_SUBTREE, NULL, "%s", filter);
if (ret != LDB_SUCCESS) return NT_STATUS_INTERNAL_DB_CORRUPTION;
DEBUG(10,("WINS scavenging: filter '%s' count %d\n", filter, res->count));
tombstone_extra_time = timeval_add(&service->startup_time,
service->config.tombstone_extra_timeout,
0);
delete_tombstones = timeval_expired(&tombstone_extra_time);
for (i=0; i < res->count; i++) {
bool has_replicas = false;
/*
* we pass '0' as 'now' here,
* because we want to get the raw timestamps which are in the DB
*/
status = winsdb_record(service->wins_db, res->msgs[i], tmp_mem, 0, &rec);
NT_STATUS_NOT_OK_RETURN(status);
talloc_free(res->msgs[i]);
modify_flags = 0;
modify_record = false;
delete_record = false;
switch (rec->state) {
case WREPL_STATE_ACTIVE:
old_state = "active";
if (rec->is_static) {
/*
*we store it again, so that it won't appear
* in the scavenging the next time
*/
old_state = "active(static)";
new_state = "active(static)";
modify_flags = 0;
modify_record = true;
break;
}
if (rec->type != WREPL_TYPE_SGROUP || !propagate) {
new_state = "released";
rec->state = WREPL_STATE_RELEASED;
rec->expire_time= service->config.tombstone_interval + now;
modify_flags = 0;
modify_record = true;
break;
}
/* check if there's any replica address */
for (i=0;rec->addresses[i];i++) {
if (strcmp(rec->addresses[i]->wins_owner, local_owner) != 0) {
has_replicas = true;
rec->addresses[i]->expire_time= service->config.renew_interval + now;
}
}
if (has_replicas) {
/* if it has replica addresses propagate them */
new_state = "active(propagated)";
rec->state = WREPL_STATE_ACTIVE;
rec->expire_time= service->config.renew_interval + now;
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
modify_record = true;
break;
}
/*
* if it doesn't have replica addresses, make it a tombstone,
* so that the released owned addresses are propagated
*/
new_state = "tombstone";
rec->state = WREPL_STATE_TOMBSTONE;
rec->expire_time= time(NULL) +
service->config.tombstone_interval +
service->config.tombstone_timeout;
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
modify_record = true;
break;
case WREPL_STATE_RELEASED:
old_state = "released";
new_state = "tombstone";
rec->state = WREPL_STATE_TOMBSTONE;
rec->expire_time= service->config.tombstone_timeout + now;
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
modify_record = true;
break;
case WREPL_STATE_TOMBSTONE:
old_state = "tombstone";
new_state = "tombstone";
if (!delete_tombstones) break;
new_state = "deleted";
delete_record = true;
break;
case WREPL_STATE_RESERVED:
DEBUG(0,("%s: corrupted record: %s\n",
__location__, nbt_name_string(rec, rec->name)));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
if (modify_record) {
action = "modify";
ret = winsdb_modify(service->wins_db, rec, modify_flags);
} else if (delete_record) {
action = "delete";
ret = winsdb_delete(service->wins_db, rec);
} else {
action = "skip";
ret = NBT_RCODE_OK;
}
if (ret != NBT_RCODE_OK) {
DEBUG(2,("WINS scavenging: failed to %s name %s (owned:%s -> owned:%s): error:%u\n",
action, nbt_name_string(rec, rec->name), old_state, new_state, ret));
} else {
DEBUG(4,("WINS scavenging: %s name: %s (owned:%s -> owned:%s)\n",
action, nbt_name_string(rec, rec->name), old_state, new_state));
}
talloc_free(rec);
}
return NT_STATUS_OK;
}
static NTSTATUS wreplsrv_scavenging_replica_non_active_records(struct wreplsrv_service *service, TALLOC_CTX *tmp_mem)
{
NTSTATUS status;
struct winsdb_record *rec = NULL;
struct ldb_result *res = NULL;
const char *owner_filter;
const char *filter;
unsigned int i;
int ret;
time_t now = time(NULL);
const char *now_timestr;
const char *action;
const char *old_state=NULL;
const char *new_state=NULL;
uint32_t modify_flags;
bool modify_record;
bool delete_record;
bool delete_tombstones;
struct timeval tombstone_extra_time;
now_timestr = ldb_timestring(tmp_mem, now);
NT_STATUS_HAVE_NO_MEMORY(now_timestr);
owner_filter = wreplsrv_owner_filter(service, tmp_mem,
service->wins_db->local_owner);
NT_STATUS_HAVE_NO_MEMORY(owner_filter);
filter = talloc_asprintf(tmp_mem,
"(&(!%s)(objectClass=winsRecord)"
"(!(recordState=%u))(expireTime<=%s))",
owner_filter, WREPL_STATE_ACTIVE, now_timestr);
NT_STATUS_HAVE_NO_MEMORY(filter);
ret = ldb_search(service->wins_db->ldb, tmp_mem, &res, NULL, LDB_SCOPE_SUBTREE, NULL, "%s", filter);
if (ret != LDB_SUCCESS) return NT_STATUS_INTERNAL_DB_CORRUPTION;
DEBUG(10,("WINS scavenging: filter '%s' count %d\n", filter, res->count));
tombstone_extra_time = timeval_add(&service->startup_time,
service->config.tombstone_extra_timeout,
0);
delete_tombstones = timeval_expired(&tombstone_extra_time);
for (i=0; i < res->count; i++) {
/*
* we pass '0' as 'now' here,
* because we want to get the raw timestamps which are in the DB
*/
status = winsdb_record(service->wins_db, res->msgs[i], tmp_mem, 0, &rec);
NT_STATUS_NOT_OK_RETURN(status);
talloc_free(res->msgs[i]);
modify_flags = 0;
modify_record = false;
delete_record = false;
switch (rec->state) {
case WREPL_STATE_ACTIVE:
DEBUG(0,("%s: corrupted record: %s\n",
__location__, nbt_name_string(rec, rec->name)));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
case WREPL_STATE_RELEASED:
old_state = "released";
new_state = "tombstone";
rec->state = WREPL_STATE_TOMBSTONE;
rec->expire_time= service->config.tombstone_timeout + now;
modify_flags = 0;
modify_record = true;
break;
case WREPL_STATE_TOMBSTONE:
old_state = "tombstone";
new_state = "tombstone";
if (!delete_tombstones) break;
new_state = "deleted";
delete_record = true;
break;
case WREPL_STATE_RESERVED:
DEBUG(0,("%s: corrupted record: %s\n",
__location__, nbt_name_string(rec, rec->name)));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
if (modify_record) {
action = "modify";
ret = winsdb_modify(service->wins_db, rec, modify_flags);
} else if (delete_record) {
action = "delete";
ret = winsdb_delete(service->wins_db, rec);
} else {
action = "skip";
ret = NBT_RCODE_OK;
}
if (ret != NBT_RCODE_OK) {
DEBUG(2,("WINS scavenging: failed to %s name %s (replica:%s -> replica:%s): error:%u\n",
action, nbt_name_string(rec, rec->name), old_state, new_state, ret));
} else {
DEBUG(4,("WINS scavenging: %s name: %s (replica:%s -> replica:%s)\n",
action, nbt_name_string(rec, rec->name), old_state, new_state));
}
talloc_free(rec);
}
return NT_STATUS_OK;
}
struct verify_state {
struct imessaging_context *msg_ctx;
struct wreplsrv_service *service;
struct winsdb_record *rec;
struct nbtd_proxy_wins_challenge r;
};
static void verify_handler(struct tevent_req *subreq)
{
struct verify_state *s =
tevent_req_callback_data(subreq,
struct verify_state);
struct winsdb_record *rec = s->rec;
const char *action;
const char *old_state = "active";
const char *new_state = "active";
const char *new_owner = "replica";
uint32_t modify_flags = 0;
bool modify_record = false;
bool delete_record = false;
bool different = false;
int ret;
NTSTATUS status;
uint32_t i, j;
/*
* - if the name isn't present anymore remove our record
* - if the name is found and not a normal group check if the addresses match,
* - if they don't match remove the record
* - if they match do nothing
* - if an error happens do nothing
*/
status = dcerpc_nbtd_proxy_wins_challenge_r_recv(subreq, s);
TALLOC_FREE(subreq);
if (NT_STATUS_EQUAL(NT_STATUS_OBJECT_NAME_NOT_FOUND, status)) {
delete_record = true;
new_state = "deleted";
} else if (NT_STATUS_IS_OK(status) && rec->type != WREPL_TYPE_GROUP) {
for (i=0; i < s->r.out.num_addrs; i++) {
bool found = false;
for (j=0; rec->addresses[j]; j++) {
if (strcmp(s->r.out.addrs[i].addr, rec->addresses[j]->address) == 0) {
found = true;
break;
}
}
if (!found) {
different = true;
break;
}
}
} else if (NT_STATUS_IS_OK(status) && rec->type == WREPL_TYPE_GROUP) {
if (s->r.out.num_addrs != 1 || strcmp(s->r.out.addrs[0].addr, "255.255.255.255") != 0) {
different = true;
}
}
if (different) {
/*
* if the reply from the owning wins server has different addresses
* then take the ownership of the record and make it a tombstone
* this will then hopefully replicated to the original owner of the record
* which will then propagate it's own record, so that the current record will
* be replicated to to us
*/
DEBUG(2,("WINS scavenging: replica %s verify got different addresses from winsserver: %s: tombstoning record\n",
nbt_name_string(rec, rec->name), rec->wins_owner));
rec->state = WREPL_STATE_TOMBSTONE;
rec->expire_time= time(NULL) + s->service->config.tombstone_timeout;
for (i=0; rec->addresses[i]; i++) {
rec->addresses[i]->expire_time = rec->expire_time;
}
modify_record = true;
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
new_state = "tombstone";
new_owner = "owned";
} else if (NT_STATUS_IS_OK(status)) {
/* if the addresses are the same, just update the timestamps */
rec->expire_time = time(NULL) + s->service->config.verify_interval;
for (i=0; rec->addresses[i]; i++) {
rec->addresses[i]->expire_time = rec->expire_time;
}
modify_record = true;
modify_flags = 0;
new_state = "active";
}
if (modify_record) {
action = "modify";
ret = winsdb_modify(s->service->wins_db, rec, modify_flags);
} else if (delete_record) {
action = "delete";
ret = winsdb_delete(s->service->wins_db, rec);
} else {
action = "skip";
ret = NBT_RCODE_OK;
}
if (ret != NBT_RCODE_OK) {
DEBUG(2,("WINS scavenging: failed to %s name %s (replica:%s -> %s:%s): error:%u\n",
action, nbt_name_string(rec, rec->name), old_state, new_owner, new_state, ret));
} else {
DEBUG(4,("WINS scavenging: %s name: %s (replica:%s -> %s:%s): %s: %s\n",
action, nbt_name_string(rec, rec->name), old_state, new_owner, new_state,
rec->wins_owner, nt_errstr(status)));
}
talloc_free(s);
}
static NTSTATUS wreplsrv_scavenging_replica_active_records(struct wreplsrv_service *service, TALLOC_CTX *tmp_mem)
{
NTSTATUS status;
struct winsdb_record *rec = NULL;
struct ldb_result *res = NULL;
const char *owner_filter;
const char *filter;
unsigned int i;
int ret;
time_t now = time(NULL);
const char *now_timestr;
struct tevent_req *subreq;
struct verify_state *s;
struct dcerpc_binding_handle *irpc_handle;
now_timestr = ldb_timestring(tmp_mem, now);
NT_STATUS_HAVE_NO_MEMORY(now_timestr);
owner_filter = wreplsrv_owner_filter(service, tmp_mem,
service->wins_db->local_owner);
NT_STATUS_HAVE_NO_MEMORY(owner_filter);
filter = talloc_asprintf(tmp_mem,
"(&(!%s)(objectClass=winsRecord)"
"(recordState=%u)(expireTime<=%s))",
owner_filter, WREPL_STATE_ACTIVE, now_timestr);
NT_STATUS_HAVE_NO_MEMORY(filter);
ret = ldb_search(service->wins_db->ldb, tmp_mem, &res, NULL, LDB_SCOPE_SUBTREE, NULL, "%s", filter);
if (ret != LDB_SUCCESS) return NT_STATUS_INTERNAL_DB_CORRUPTION;
DEBUG(10,("WINS scavenging: filter '%s' count %d\n", filter, res->count));
for (i=0; i < res->count; i++) {
/*
* we pass '0' as 'now' here,
* because we want to get the raw timestamps which are in the DB
*/
status = winsdb_record(service->wins_db, res->msgs[i], tmp_mem, 0, &rec);
NT_STATUS_NOT_OK_RETURN(status);
talloc_free(res->msgs[i]);
if (rec->state != WREPL_STATE_ACTIVE) {
DEBUG(0,("%s: corrupted record: %s\n",
__location__, nbt_name_string(rec, rec->name)));
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
/*
* ask the owning wins server if the record still exists,
* if not delete the record
*
* TODO: NOTE: this is a simpliefied version, to verify that
* a record still exist, I assume that w2k3 uses
* DCERPC calls or some WINSREPL packets for this,
* but we use a wins name query
*/
DEBUG(2,("ask wins server '%s' if '%s' with version_id:%llu still exists\n",
rec->wins_owner, nbt_name_string(rec, rec->name),
(unsigned long long)rec->version));
s = talloc_zero(tmp_mem, struct verify_state);
NT_STATUS_HAVE_NO_MEMORY(s);
s->msg_ctx = service->task->msg_ctx;
s->service = service;
s->rec = talloc_steal(s, rec);
s->r.in.name = *rec->name;
s->r.in.num_addrs = 1;
s->r.in.addrs = talloc_array(s, struct nbtd_proxy_wins_addr, s->r.in.num_addrs);
NT_STATUS_HAVE_NO_MEMORY(s->r.in.addrs);
/* TODO: fix pidl to handle inline ipv4address arrays */
s->r.in.addrs[0].addr = rec->wins_owner;
irpc_handle = irpc_binding_handle_by_name(s,
service->task->msg_ctx,
"nbt_server",
&ndr_table_irpc);
if (irpc_handle == NULL) {
return NT_STATUS_INTERNAL_ERROR;
}
subreq = dcerpc_nbtd_proxy_wins_challenge_r_send(s,
service->task->event_ctx,
irpc_handle,
&s->r);
NT_STATUS_HAVE_NO_MEMORY(subreq);
tevent_req_set_callback(subreq, verify_handler, s);
talloc_steal(service, s);
}
return NT_STATUS_OK;
}
NTSTATUS wreplsrv_scavenging_run(struct wreplsrv_service *service)
{
NTSTATUS status;
TALLOC_CTX *tmp_mem;
bool skip_first_run = false;
if (!timeval_expired(&service->scavenging.next_run)) {
return NT_STATUS_OK;
}
if (timeval_is_zero(&service->scavenging.next_run)) {
skip_first_run = true;
}
service->scavenging.next_run = timeval_current_ofs(service->config.scavenging_interval, 0);
status = wreplsrv_periodic_schedule(service, service->config.scavenging_interval);
NT_STATUS_NOT_OK_RETURN(status);
/*
* if it's the first time this functions is called (startup)
* the next_run is zero, in this case we should not do scavenging
*/
if (skip_first_run) {
return NT_STATUS_OK;
}
if (service->scavenging.processing) {
return NT_STATUS_OK;
}
DEBUG(2,("wreplsrv_scavenging_run(): start\n"));
tmp_mem = talloc_new(service);
NT_STATUS_HAVE_NO_MEMORY(tmp_mem);
service->scavenging.processing = true;
status = wreplsrv_scavenging_owned_records(service,tmp_mem);
service->scavenging.processing = false;
talloc_free(tmp_mem);
NT_STATUS_NOT_OK_RETURN(status);
tmp_mem = talloc_new(service);
NT_STATUS_HAVE_NO_MEMORY(tmp_mem);
service->scavenging.processing = true;
status = wreplsrv_scavenging_replica_non_active_records(service, tmp_mem);
service->scavenging.processing = false;
talloc_free(tmp_mem);
NT_STATUS_NOT_OK_RETURN(status);
tmp_mem = talloc_new(service);
NT_STATUS_HAVE_NO_MEMORY(tmp_mem);
service->scavenging.processing = true;
status = wreplsrv_scavenging_replica_active_records(service, tmp_mem);
service->scavenging.processing = false;
talloc_free(tmp_mem);
NT_STATUS_NOT_OK_RETURN(status);
DEBUG(2,("wreplsrv_scavenging_run(): end\n"));
return NT_STATUS_OK;
}
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