/*
do a sgroup merge
*/
static uint8_t wins_sgroup_merge(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct winsdb_record *rec,
const char *address,
const struct socket_address *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
uint32_t ttl = wins_server_ttl(winssrv, packet->additional[0].ttl);
rec->expire_time = time(NULL) + ttl;
rec->registered_by = src->addr;
rec->addresses = winsdb_addr_list_add(winssrv->wins_db,
rec, rec->addresses,
address,
winssrv->wins_db->local_owner,
rec->expire_time,
true);
if (rec->addresses == NULL) return NBT_RCODE_SVR;
DEBUG(5,("WINS: sgroup merge of %s at %s\n",
nbt_name_string(packet, rec->name), address));
return winsdb_modify(winssrv->wins_db, rec, WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP);
}
/*
update the ttl on an existing record
*/
static uint8_t wins_update_ttl(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct winsdb_record *rec,
struct winsdb_addr *winsdb_addr,
const struct socket_address *src)
{
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
uint32_t ttl = wins_server_ttl(winssrv, packet->additional[0].ttl);
const char *address = packet->additional[0].rdata.netbios.addresses[0].ipaddr;
uint32_t modify_flags = 0;
rec->expire_time = time(NULL) + ttl;
rec->registered_by = src->addr;
if (winsdb_addr) {
rec->addresses = winsdb_addr_list_add(winssrv->wins_db,
rec, rec->addresses,
winsdb_addr->address,
winssrv->wins_db->local_owner,
rec->expire_time,
true);
if (rec->addresses == NULL) return NBT_RCODE_SVR;
}
if (strcmp(winssrv->wins_db->local_owner, rec->wins_owner) != 0) {
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
}
DEBUG(5,("WINS: refreshed registration of %s at %s\n",
nbt_name_string(packet, rec->name), address));
return winsdb_modify(winssrv->wins_db, rec, modify_flags);
}
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;
uint32_t 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)"
"(expireTime<=%s))",
owner_filter, now_timestr);
NT_STATUS_HAVE_NO_MEMORY(filter);
ret = ldb_search(service->wins_db->ldb, NULL, LDB_SCOPE_SUBTREE, filter, NULL, &res);
if (ret != LDB_SUCCESS) return NT_STATUS_INTERNAL_DB_CORRUPTION;
talloc_steal(tmp_mem, res);
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:
old_state = "active";
new_state = "active";
if (!rec->is_static) {
new_state = "released";
rec->state = WREPL_STATE_RELEASED;
rec->expire_time= service->config.tombstone_interval + now;
}
modify_flags = 0;
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(1,("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;
}
/*
release a name
*/
static void nbtd_winsserver_release(struct nbt_name_socket *nbtsock,
struct nbt_name_packet *packet,
struct socket_address *src)
{
NTSTATUS status;
struct nbtd_interface *iface = talloc_get_type(nbtsock->incoming.private_data,
struct nbtd_interface);
struct wins_server *winssrv = iface->nbtsrv->winssrv;
struct nbt_name *name = &packet->questions[0].name;
struct winsdb_record *rec;
uint32_t modify_flags = 0;
uint8_t ret;
if (name->type == NBT_NAME_MASTER) {
goto done;
}
if (name->scope && strlen(name->scope) > 237) {
goto done;
}
status = winsdb_lookup(winssrv->wins_db, name, packet, &rec);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
if (rec->is_static) {
if (rec->type == WREPL_TYPE_UNIQUE || rec->type == WREPL_TYPE_MHOMED) {
goto done;
}
nbtd_name_release_reply(nbtsock, packet, src, NBT_RCODE_ACT);
return;
}
if (rec->state != WREPL_STATE_ACTIVE) {
goto done;
}
/*
* TODO: do we need to check if
* src->addr matches packet->additional[0].rdata.netbios.addresses[0].ipaddr
* here?
*/
/*
* we only allow releases from an owner - other releases are
* silently ignored
*/
if (!winsdb_addr_list_check(rec->addresses, src->addr)) {
int i;
DEBUG(4,("WINS: silently ignoring attempted name release on %s from %s\n", nbt_name_string(rec, rec->name), src->addr));
DEBUGADD(4, ("Registered Addresses: \n"));
for (i=0; rec->addresses && rec->addresses[i]; i++) {
DEBUGADD(4, ("%s\n", rec->addresses[i]->address));
}
goto done;
}
DEBUG(4,("WINS: released name %s from %s\n", nbt_name_string(rec, rec->name), src->addr));
switch (rec->type) {
case WREPL_TYPE_UNIQUE:
rec->state = WREPL_STATE_RELEASED;
break;
case WREPL_TYPE_GROUP:
rec->state = WREPL_STATE_RELEASED;
break;
case WREPL_TYPE_SGROUP:
winsdb_addr_list_remove(rec->addresses, src->addr);
/* TODO: do we need to take the ownership here? */
if (winsdb_addr_list_length(rec->addresses) == 0) {
rec->state = WREPL_STATE_RELEASED;
}
break;
case WREPL_TYPE_MHOMED:
winsdb_addr_list_remove(rec->addresses, src->addr);
/* TODO: do we need to take the ownership here? */
if (winsdb_addr_list_length(rec->addresses) == 0) {
rec->state = WREPL_STATE_RELEASED;
}
break;
}
if (rec->state == WREPL_STATE_ACTIVE) {
/*
* If the record is still active, we need to update the
* expire_time.
*
* if we're not the owner, we need to take the ownership.
*/
rec->expire_time= time(NULL) + winssrv->config.max_renew_interval;
if (strcmp(rec->wins_owner, winssrv->wins_db->local_owner) != 0) {
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
}
if (lpcfg_parm_bool(iface->nbtsrv->task->lp_ctx, NULL, "wreplsrv", "propagate name releases", false)) {
/*
* We have an option to propagate every name release,
* this is off by default to match windows servers
*/
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
}
} else if (rec->state == WREPL_STATE_RELEASED) {
/*
* if we're not the owner, we need to take the owner ship
* and make the record tombstone, but expire after
* tombstone_interval + tombstone_timeout and not only after tombstone_timeout
* like for normal tombstone records.
* This is to replicate the record directly to the original owner,
* where the record is still active
*/
if (strcmp(rec->wins_owner, winssrv->wins_db->local_owner) == 0) {
rec->expire_time= time(NULL) + winssrv->config.tombstone_interval;
} else {
rec->state = WREPL_STATE_TOMBSTONE;
rec->expire_time= time(NULL) +
winssrv->config.tombstone_interval +
winssrv->config.tombstone_timeout;
modify_flags = WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP;
}
}
ret = winsdb_modify(winssrv->wins_db, rec, modify_flags);
if (ret != NBT_RCODE_OK) {
DEBUG(1,("WINS: FAILED: released name %s at %s: error:%u\n",
nbt_name_string(rec, rec->name), src->addr, ret));
}
done:
/* we match w2k3 by always giving a positive reply to name releases. */
nbtd_name_release_reply(nbtsock, packet, src, NBT_RCODE_OK);
}
/*
allow a registration request
*/
static void wins_wack_allow(struct nbtd_wins_wack_state *s)
{
NTSTATUS status;
uint32_t ttl = wins_server_ttl(s->winssrv, s->request_packet->additional[0].ttl);
struct winsdb_record *rec = s->rec, *rec2;
uint32_t i,j;
status = winsdb_lookup(s->winssrv->wins_db, rec->name, s, &rec2);
if (!NT_STATUS_IS_OK(status) ||
rec2->version != rec->version ||
strcmp(rec2->wins_owner, rec->wins_owner) != 0) {
DEBUG(5,("WINS: record %s changed during WACK - failing registration\n",
nbt_name_string(s, rec->name)));
wins_wack_deny(s);
return;
}
/*
* if the old name owner doesn't hold the name anymore
* handle the request as new registration for the new name owner
*/
if (!NT_STATUS_IS_OK(s->status)) {
uint8_t rcode;
winsdb_delete(s->winssrv->wins_db, rec);
rcode = wins_register_new(s->nbtsock, s->request_packet, s->src, s->new_type);
if (rcode != NBT_RCODE_OK) {
DEBUG(1,("WINS: record %s failed to register as new during WACK\n",
nbt_name_string(s, rec->name)));
wins_wack_deny(s);
return;
}
goto done;
}
rec->expire_time = time(NULL) + ttl;
rec->registered_by = s->src->addr;
/*
* now remove all addresses that the client doesn't hold anymore
* and update the time stamp and owner for the ones that are still there
*/
for (i=0; rec->addresses[i]; i++) {
bool found = false;
for (j=0; j < s->io.out.num_addresses; j++) {
if (strcmp(rec->addresses[i]->address, s->io.out.addresses[j]) != 0) continue;
found = true;
break;
}
if (found) {
rec->addresses = winsdb_addr_list_add(s->winssrv->wins_db,
rec, rec->addresses,
s->reg_address,
s->winssrv->wins_db->local_owner,
rec->expire_time,
true);
if (rec->addresses == NULL) goto failed;
continue;
}
winsdb_addr_list_remove(rec->addresses, rec->addresses[i]->address);
}
rec->addresses = winsdb_addr_list_add(s->winssrv->wins_db,
rec, rec->addresses,
s->reg_address,
s->winssrv->wins_db->local_owner,
rec->expire_time,
true);
if (rec->addresses == NULL) goto failed;
/* if we have more than one address, this becomes implicit a MHOMED record */
if (winsdb_addr_list_length(rec->addresses) > 1) {
rec->type = WREPL_TYPE_MHOMED;
}
winsdb_modify(s->winssrv->wins_db, rec, WINSDB_FLAG_ALLOC_VERSION | WINSDB_FLAG_TAKE_OWNERSHIP);
DEBUG(4,("WINS: accepted registration of %s with address %s\n",
nbt_name_string(s, rec->name), s->reg_address));
done:
nbtd_name_registration_reply(s->nbtsock, s->request_packet,
s->src, NBT_RCODE_OK);
failed:
talloc_free(s);
}
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;
}
