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